WO2007026813A1 - 光ディスク及びその製造方法、スタンパー、信号処理方法、信号処理装置、画像描画方法、光ディスク記録装置、並びに、光記録媒体 - Google Patents
光ディスク及びその製造方法、スタンパー、信号処理方法、信号処理装置、画像描画方法、光ディスク記録装置、並びに、光記録媒体 Download PDFInfo
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- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/0079—Zoned data area, e.g. having different data structures or formats for the user data within data layer, Zone Constant Linear Velocity [ZCLV], Zone Constant Angular Velocity [ZCAV], carriers with RAM and ROM areas
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24085—Pits
Definitions
- Optical disc and manufacturing method thereof stamper, signal processing method, signal processing device, image drawing method, optical disc recording device, and optical recording medium
- the present invention relates to an optical disc capable of recording / reproducing information with a laser beam, and more particularly to an optical disc capable of further drawing (recording visible information) with a laser beam.
- the present invention also relates to a stamper suitable for manufacturing the optical disk and an optical disk manufacturing method.
- the present invention relates to a signal processing method, a signal processing device, an image drawing method, an optical disc recording device, and an optical recording medium that can be used for the optical disc of the present invention.
- a typical structure is a recording layer (information recording medium) made of an organic dye on a transparent disk-shaped substrate. Layer), a light reflecting layer made of metal such as gold, and a protective layer made of resin are provided in this order.
- Information is recorded on the CD-R by irradiating the CD-R with near-infrared laser light (usually a laser light having a wavelength of around 780 nm). Information is recorded by absorbing light and raising the temperature locally, causing physical or chemical changes (eg, pit formation) and changing its optical properties.
- DVD-R recordable digital 'vasatile disc
- This DVD-R has a narrower groove (track pitch) of 0.74-0.
- This DVD-R has an information recording layer made of a dye on a transparent disk-shaped substrate on which guide grooves are formed, and usually a reflective layer on the information recording layer and, if necessary, a protective layer. It has a structure in which two disks or a disk-shaped protective substrate having the same shape as the disk is bonded with an adhesive with the information recording layer inside. Recording and playback of information on a DVD-R is performed by irradiating visible laser light (usually laser light with a wavelength of 630 nm to 680 nm). High-density recording is possible.
- the optical disc has a music title recorded on the recording surface, a title for identifying the recorded data, etc. on the surface opposite to the recording surface on which the music data is recorded.
- a label with visible information printed on it is manufactured by printing a title or the like on a circular label sheet in advance with a printer or the like, and sticking the label sheet on a surface opposite to the recording surface of the optical disk.
- an optical disc recording apparatus that can perform not only recording / reproducing information but also drawing an image on a label surface with a laser beam (for example, Patent Document 1).
- This optical disk recording apparatus is intended for an optical disk having a heat-sensitive layer on the label surface side. By scanning a laser pickup and irradiating the heat-sensitive layer (image recording layer) with laser light in an image-like manner, The color is changed to form a visible image.
- an optical disc in which an ink receiving layer (printing layer) is provided on the label surface has been put into practical use.
- the user can print a photograph or a picture on the print layer using an inkjet printer or the like.
- Patent Document 2 A method for example, Patent Document 2.
- the image forming apparatus and the image forming method perform drawing and recording without applying tracking, there is a problem that drawing accuracy and stability are lacking. This can be improved by mounting drawing information and the like on the optical disk and reading the information by the recorder.
- the inner circumferential circle of the image recording layer is not a perfect circle, and the circle has a slightly distorted shape. Therefore, if an image is drawn up to the inner peripheral edge of the image recording layer, the image is recorded in a state of locally protruding to the inner side, which may impair the appearance of the inner peripheral edge of the image recording layer.
- the center hole for example, an area having a radius of 2 lmm to 24 mm
- the disc drive can recognize that it is on the image recording layer side of the optical disc, or If information such as the optimum drawing conditions for each disk is recorded, and the conditions are read at the time of drawing an image and are drawn based on the conditions, drawing with higher quality can be performed.
- the prepit area is formed, for example, in an inner peripheral area of the optical disk (for example, an area having a radius of 21 to 24 mm), and the image recording layer is also formed in such a prepit area. In some cases, there is a problem in signal readout.
- Patent Document 1 Japanese Patent Laid-Open No. 2003-203348
- Patent Document 2 JP 2004-005848
- Patent Document 3 JP 2000-113516
- Patent Document 4 Japanese Patent Laid-Open No. 2001-283464
- Patent Document 5 JP 2000-173096
- (1-1) an image recording layer capable of drawing a visible image by laser light irradiation; and disc information are recorded;
- An optical disk including a pre-pit or a pre-group provided inside an image drawing area, wherein the image recording layer forming area includes an image drawing area on which the visible image is drawn, and an image And an image drawing prohibited area where drawing is prohibited, and position information of the image drawing prohibited area is recorded in the pre-pit or pre-group.
- the image drawing prohibited area is located between the image drawing area and the prepit or pregroup. It is characterized by that.
- the first aspect of the present invention is (1-3) an image drawing method for drawing a visible image on an image recording layer of an optical disc, wherein disc information is recorded. Recognizing position information of an image drawing prohibition area recorded in a pre-pit or pre-group, which is provided inside an area for drawing an image of a recording layer; and recognized image drawing
- the present invention provides the method, characterized in that the image prohibition region includes control so as not to perform image drawing, and that a visible image can be drawn on the image recording layer by laser light irradiation.
- the first aspect of the present invention is (1-4) an image drawing method for drawing a visible image on an image recording layer of an optical disc, wherein an image is drawn in a formation region of the image recording layer.
- a predetermined image drawing area and an image drawing prohibited area where image drawing is prohibited; and control to draw an image only in the image drawing area, and the irradiation of laser light This method is characterized in that a visible image can be drawn on an image recording layer.
- the first aspect of the present invention is (1-5) an optical disc recording apparatus capable of drawing a visible image on an image recording layer of an optical disc.
- the image recording layer forming area includes an image drawing area where an image is drawn, and an image drawing prohibited area where image drawing is prohibited, and the prepit or pregroup includes the image Record the location information of the drawing prohibited area
- the optical disc recording apparatus is provided.
- the first aspect of the present invention is (16) an optical disc capable of drawing an image on an image recording layer of an optical disc having an image recording layer capable of drawing a visible image by laser light irradiation.
- the image recording layer forming area of the optical disc is determined in advance as two areas: an image drawing area where an image is drawn and an image drawing prohibited area where image drawing is prohibited,
- an optical disc recording apparatus including control means for controlling to draw an image only in an image drawing area.
- the second aspect of the present invention is (2-1) a signal processing method for processing a signal based on return light obtained by irradiating a single laser beam onto an optical disc provided with prepits, Read the prepit signal by irradiating the prepit area of the optical disc with laser light, invert the polarity of the prepit signal, and decode the inverted prepit signal Providing the method.
- a correct signal is obtained by the step of inverting the polarity of the prepit signal and can be used for decoding processing. it can.
- the signal processing method of (2-1) includes equalization before and after inverting the polarity of the prep signal.
- the signal processing method of (2-1) or (2-2) is such that the optical disc can draw a visible image by irradiation with laser light. It is an optical disc having an image recording layer, and the image recording layer is also formed in the pre-pit region.
- the polarity of the generated signal is formed in the prepit area.
- the polarity of the prepit signal is inverted to the correct polarity and can be used for the decoding process.
- the second aspect of the present invention is (2-4) a signal processing device for processing a signal based on return light obtained by irradiating an optical disc on which prepits are formed with a single laser beam,
- an apparatus comprising: means for reading a prepit signal by irradiating a prepit area of an optical disc; reading means for inverting the polarity of the prepit signal; and means for decoding the inverted prepit signal.
- a pre-pit signal opposite to the signal recognized by the decoder when a pre-pit signal opposite to the signal recognized by the decoder is output, it becomes a correct signal by means of inverting the polarity of the pre-pit signal and can be used for decoding processing. it can.
- the second aspect of the present invention includes (2-5) an image recording layer capable of drawing a visible image by laser light irradiation, and a part of a region where the image recording layer is formed.
- the second aspect of the present invention is (2-6) provided in an image recording layer capable of drawing a visible image by laser light irradiation and a part of a region where the image recording layer is formed.
- An optical disk recording apparatus for drawing an image on the image recording layer of an optical disk including a prepit, wherein the prepit area is irradiated with a laser beam to read a prepit signal; the polarity of the prepit signal is inverted;
- the apparatus includes: means for decoding the prepit signal to obtain prepit information; and means for drawing an image based on the prepit information.
- the pre-pit is provided in a part of the image recording layer formation region, a pre-pit signal opposite to the signal recognized by the decoder is output, but the polarity of the pre-pit signal is inverted.
- a correct signal can be obtained and subjected to decoding processing.
- the second aspect of the present invention is an optical disc comprising (2-7) a substrate and an image recording layer formed on the substrate and capable of drawing a visible image by irradiation with a laser beam.
- Information relating to the optical disk is recorded by prepits on the substrate in the image recording layer forming region, and the reflectance at the prepit portion is higher than the reflectance between the prepits.
- the optical disc is provided.
- a third aspect of the present invention is an optical disc comprising (3-1) a substrate and an image recording layer formed on the substrate and capable of drawing a visible image by irradiation with laser light.
- an optical disc characterized in that prepits are formed on the surface of the substrate on the image recording layer side, and the average depth h of the prepits is 100 to 400 nm.
- the signal reading accuracy can be increased.
- the average depth h of the prepits is 100 to 250 nm. More preferably, it is nm. In this case, as will be described later, since the signal characteristics are superior compared to the case where the dye recording layer is formed on the prepit formation region, the shape of the prepit can be widened.
- the average depth h of the prepit is preferably 150 to 400 nm, and preferably 150 to 350 nm.
- the laser return light is affected by the dye, and thus the above range is preferable from the viewpoint of increasing the signal reading accuracy.
- the third aspect of the present invention is an optical disc comprising (3-2) a substrate and an image recording layer formed on the substrate and capable of drawing a visible image by irradiation with laser light.
- an optical disc characterized in that prepits are formed on the surface of the substrate on the image recording layer side, and the average half width W of the prepits is 200 to 500 nm.
- a third aspect of the present invention is an optical disc comprising (3-3) a substrate and an image recording layer formed on the substrate and capable of drawing a visible image by irradiation with laser light. Prepits are formed on the surface of the substrate on the image recording layer side, the average thickness h of the image recording layer on the projections of the prepits, and the image recording on the recesses of the prepits
- the ratio of the average thickness h of the layer (h Zh) is 0.1 to 0.9
- the optical disc recording apparatus can recognize the optical disc by mounting product information and drawing information on the optical disc in the prepit.
- the optical disc of the present invention since the above information satisfies the above specific condition, the return light from the optical disc force can be sufficiently secured and signal detection can be facilitated. Further, high drawing characteristics can be exhibited using information related to drawing. Further, since the pre-pit has the specific shape, the signal amplitude of the detection signal is increased, and the signal reading accuracy can be increased.
- the ratio (h Zh) to the average thickness h of the image recording layer on the part is 0.1 to 0.9
- the depth (h + h h) of the recess of the image recording layer on the recess of the repit is 70 to 250 nm.
- the surface on which the reflective layer of the image recording layer is formed has appropriate irregularities for reading laser light, and a good reproduction signal can be obtained.
- Enough can be secured. Furthermore, with this embodiment, a better reproduction signal can be obtained.
- the image recording layer is an embodiment containing a dye compound.
- a so-called dye-type optical disk can be obtained.
- Dye type optical disc has clear pits Therefore, sufficient contrast and visibility can be obtained.
- the image recording layer is formed by spin coating using a coating liquid containing the dye compound.
- a coating liquid containing the dye compound By forming by spin coating, the base image recording layer can be easily formed, and an optical disc with high productivity can be obtained.
- the thickness of the substrate is 0.5 to 1.1 mm.
- 0.5 to 1.1 mm for example, it is possible to draw with a laser that can be installed in DVD-R and DVD + R drives and DVD recorders.
- the image recording layer is a layer on which visible information is recorded by irradiating a laser beam to a substantially same locus a plurality of times, and visible information is detected by detecting return light after irradiating the prepit with the laser beam. Is recorded. With this mode, the drive or recorder can recognize that the disc is drawable. Also, by irradiating multiple times
- the image recording layer force is a layer in which visible light is recorded by laser light oscillating in the radial direction of the optical disk and irradiated onto a substantially identical locus a plurality of times, and after the prepits are irradiated with laser light
- the present invention is not limited to a disk-shaped one, and may be a card-shaped optical information recording medium.
- the optical recording medium of the third aspect is a system in which laser light is irradiated a plurality of times on substantially the same locus, or a plurality of laser lights oscillating in the radial direction of the optical disk and on substantially the same locus. It is preferably used in a system that is irradiated twice. Even when the optical recording medium described above is used in such a system, the information on the optical disc can be sufficiently recognized by the apparatus, and the recording of visible information proceeds smoothly.
- the above-mentioned optical discs having the pre-shaped pre-pits are optical disc devices for CD applications (laser wavelength 700 ⁇ m to 800nm), DVD applications (laser wavelength 600nm to 700nm), Blu-ray discs and HD DVD applications (laser wavelength 380nm to 450nm). ! / Can also be used for misalignment. Since these devices have the pre-pits of the specific shape, the signal detection of the optical disc can be performed smoothly. Among these applications, the specific pre-pits mentioned above It is preferable that the optical disc having the above is used for an optical disc apparatus for DVD use. In the case of prepits with the specific shape described above, since the signal can be sufficiently detected even if the laser wavelength is 600 nm to 700 nm, the visible information can be recorded smoothly.
- a third aspect of the present invention is a stamper for manufacturing the substrate of the optical disk of the present invention as described above, and is provided with unevenness for forming the prepits. Provide a stamper to do. By using a stamper that can be produced, the optical disk of the present invention can be manufactured efficiently. In order to form pits having the above-described shape on the substrate, it is preferable that the stamper of the present invention has an average height of the convex portions of the concave and convex portions of 150 to 400 nm.
- a stamper according to the third aspect of the present invention described above is manufactured; a substrate having prepits on the side on which an image recording layer is formed using the stamper. And forming an image recording layer on the substrate having the prepits.
- An optical disc manufacturing method is provided. By the production method of the present invention, the optical disk of the present invention can be produced efficiently.
- the prepit signal is read by irradiating the prepit area of the optical disc of the present invention described above with laser light; the polarity of the prepit signal is inverted; And a signal processing method including decoding the inverted pre-pit signal.
- the third aspect of the present invention is a means for reading a prepit signal by irradiating a prepit region of the optical disc of the present invention described above with laser light; a means for inverting the polarity of the prepit signal; and And a signal processing device including means for decoding the inverted pre-pit signal.
- a prepit signal is read by irradiating a prepit region of the optical disc of the present invention described above with laser light; the polarity of the prepit signal is inverted;
- an image drawing method comprising: decoding an inverted prepit signal to obtain prepit information; and drawing an image based on the prepit information.
- the third aspect of the present invention is a means for reading a prepit signal by irradiating a prepit area of the optical disc of the present invention with a laser beam; reversing the polarity of the prepit signal
- an optical disk recording apparatus comprising: means for decoding; means for decoding the inverted prepit signal to obtain prepit information; and means for drawing an image based on the prepit information.
- a third aspect of the present invention is an optical recording medium comprising a substrate and an image recording layer formed on the substrate and capable of drawing a visible image by irradiation with a laser beam,
- the body can also exert the same effect as the optical disk of the present invention.
- an optical disc in which a predetermined image drawing prohibited area is provided on the inner periphery side of the image recording layer, an image drawing method on the optical disc, and an optical disc recording apparatus. Can do.
- the signal processing method capable of obtaining the prepit information by decoding the prepit signal And a signal processing apparatus for executing the signal processing method can be provided.
- an image capable of performing image drawing on an image recording layer of an optical disc having an image recording layer capable of drawing a visible image by laser light irradiation with higher quality can be provided.
- the third aspect of the present invention it is possible to provide an optical disc capable of easily detecting a signal related to drawing.
- the third aspect of the present invention can provide a stamper and an optical disc manufacturing method for efficiently manufacturing the optical disc.
- the third aspect of the present invention provides a signal processing method capable of obtaining prepit information by decoding the prepit signal for the specific optical disc, and a signal processing apparatus for executing the signal processing method. can do.
- an optical disc recording apparatus and an optical recording medium to which the image drawing method can be applied can be provided.
- FIG. 1A is a partial cross-sectional view showing an example of a layer structure of an optical disc according to a first aspect of the present invention.
- FIG. 1B is a partial cross-sectional view showing an example of the layer structure of the optical disc of the second and third aspects of the present invention.
- FIG. 2A is a view of the optical recording layer side force of the optical disc of the first embodiment of the present invention.
- FIG. 2B is a partial cross-sectional view showing an example of the layer structure of the substrate, the image recording layer, and the reflective layer of the optical disc according to the second and third aspects of the present invention.
- FIG. 2C is a top view of the optical disc of the third embodiment of the present invention.
- FIG. 3 is a block diagram showing a configuration of an example of an optical disk recording apparatus capable of handling the optical disk of the present invention.
- FIG. 4 is a diagram showing a configuration of an optical pickup that is a component of the optical disc recording apparatus.
- FIG. 5 is a diagram for explaining the contents of image data used for forming a visible image on the image recording layer of the optical disc by the optical disc recording apparatus.
- FIG. 6 is a diagram for explaining the content of laser light irradiation control for expressing the density of an image when the optical disc recording apparatus forms a visible image on the image recording layer of the optical disc of the present invention. is there.
- FIG. 7 is a diagram for explaining a laser light control method when the optical disc recording apparatus forms a visible image on the image recording layer of the optical disc.
- FIG. 8 is a diagram for explaining the contents of laser power control by a laser power control circuit that is a component of the optical disk recording apparatus.
- FIG. 9 is a diagram showing the return light of the laser light irradiated on the image recording layer of the optical disc from the optical pickup of the optical disc recording apparatus.
- FIG. 10 is a diagram showing an FG pulse generated according to the amount of rotation of a spindle motor by a frequency generator 21 which is a constituent element of the optical disc recording apparatus, and a clock signal generated based on the FG pulse.
- FIG. 11 is a flowchart for explaining the operation of the optical disc recording apparatus.
- FIG. 12 is a flowchart for explaining the operation of the optical disc recording apparatus.
- FIG. 13 is a diagram showing a disc ID recorded on an image recording layer of the optical disc.
- FIG. 14 is a diagram showing the shape of the return light of the laser beam received by the light receiving element of the optical pickup of the optical disc recording apparatus.
- FIG. 15A is a diagram in the case where the beam spot diameter (BS) of the laser beam irradiated to the image recording layer of the optical disc by the optical pickup of the optical disc recording apparatus is large.
- BS beam spot diameter
- FIG. 15B is a diagram showing a case where the beam spot diameter (BS) of the laser beam irradiated to the image recording layer of the optical disc by the optical pickup of the optical disc recording apparatus is small.
- BS beam spot diameter
- FIG. 16 is a diagram for explaining a method of detecting that the laser beam irradiation position of the optical disk recording apparatus has passed the reference position of the optical disk.
- FIG. 17 is a diagram for explaining a method of detecting that the laser beam irradiation position of the optical disk recording apparatus has passed the reference position of the optical disk.
- FIG. 18 is a timing chart for explaining the operation of the optical disc recording apparatus when a visible image is formed by irradiating the image recording layer of the optical disc with laser light.
- FIG. 19 is a diagram showing an image recording layer of the optical disc irradiated with laser light from the optical disc recording apparatus.
- FIG. 20 is a top view when the optical disk of the third aspect of the present invention has a print area and the like.
- FIG. 21 is a partial cross-sectional view when the optical disk of the third aspect of the present invention has a print area and the like. It is a figure.
- the optical disk of the present invention is an optical disk having an image recording layer capable of drawing a visible image by laser light irradiation.
- the optical disc has an area for drawing an image on the image recording layer.
- An optical disc in which disc information is recorded by pre-pits or pre-groups inside the area, and the image recording layer forming area includes an image drawing area where an image is drawn
- the pre-pits or pre-groups are formed on the surface on the image recording layer side of a substrate (details will be described later) close to the image recording layer.
- FIG. 1A is a partial cross-sectional view schematically showing a layer configuration of an example of an optical disc according to the first aspect of the present invention.
- the optical disc 500 includes a first laminate in which an information recording layer 514 and a first reflective layer 516 are laminated in this order on a first substrate 512.
- a second laminated body 528 in which a body 520, an image recording layer 524 on which a visible image is recorded by laser irradiation, and a second reflective layer 526 are laminated in this order on a second substrate 522.
- the first laminated body 520 and the second laminated body 528 are bonded to each other through the adhesive layer 530 so that the first reflective layer 516 and the second reflective layer 526 are opposed to each other. Then, prepits 600 (or pregroups) are formed on the inner peripheral side of the formation region of the image recording layer 524 of the second substrate 522.
- FIG. 2A shows a view of the optical disc 500 having the configuration shown in FIG. 1A viewed from the second substrate 522 side.
- the image recording layer 524 formation area includes an image drawing area 524A where an image is drawn and an image drawing prohibited area 524B where image drawing is prohibited.
- the image drawing area 524A and the image drawing prohibition area 524B exist in a state that can be distinguished from other areas in the image recording layer 524, and are not virtual areas but are virtual areas.
- the position information of the image drawing prohibited area 524B which may be recorded in the pre-pit 600, is detected by the optical disc recording apparatus described later, and recognizes the position information of the image drawing prohibited area by detecting the pre-pit 600. Does not draw an image! It can be controlled to draw an image.
- the optical disc of the present invention there is an image drawing prohibited area in which image drawing is prohibited in the image recording layer forming area.
- the image drawing prohibited area is shown in FIG. 2A.
- pre-pit pre-group
- pre-pit pre-group
- it is not a perfect circle there is an effect that the appearance is not impaired by prohibiting image drawing in the vicinity of the inner peripheral edge of the image recording layer. is there.
- the image drawing prohibited area depends on the size of the image recording layer formation area, but it is preferable to use an area with a radius of 23.5 mm of the optical disk up to 25. Omm. 24. Om More preferably, the area is from m to 24.5 mm.
- the area is from m to 24.5 mm.
- the outer diameter of the prepit formation area is a radius of 24. Omm
- an area from a radius of 24.Omm to 24.5mm can be set as an image drawing prohibited area.
- the optical disc in the optical disc, information relating to the optical disc is recorded by prepits in the image recording layer formation region, and the reflectance at the prepit portion is reflected between the prepits. It is characterized by being higher than the rate.
- the prepits are formed on the surface of the substrate closest to the image recording layer on the image recording layer side.
- information related to drawing of the image recording layer such as drawing laser power and light emission pattern can be recorded by the pre-pits, so that signal detection related to the image recording layer can be facilitated.
- drawing different drawing conditions for each optical disc in advance as prepit information and drawing under the optimum drawing conditions based on the prepit information high drawing characteristics can be exhibited.
- Other information obtained from the prepit includes manufacturer information. It should be noted that the closest substrate is closer to a substrate on which optical data is read and on which no pit is formed, or an information recording layer contributing to optical information recording / reproduction. A substrate to be placed.
- FIG. 1B is a partial cross-sectional view showing an example of the layer configuration of the optical disc 500 of the second and third embodiments of the present invention.
- An optical disc 500 is formed by irradiating a laser beam on a first laminate 520 having an information recording layer 514 and a first reflective layer 516 in this order on a first substrate 512, and on a second substrate 522. It has an image recording layer 524 on which a visible image is recorded and a second laminate 528 having a second reflective layer 526 in this order, and the first laminate 520 and the second laminate 528 are The first reflective layer 516 and the second reflective layer 526 are bonded together via an adhesive layer 530 so as to face each other. Further, the surface of the second substrate 522 on which the image recording layer is formed is A pre-pit is formed.
- the image recording layer 524 is formed up to the region where the prepits 600 are formed. That is, the image recording layer 524 is formed on the region of the prep 600.
- the region where the prepits are formed is not particularly limited. That is, the prepits may be formed on the inner peripheral side of the region where the image recording layer is formed. That is, as shown in FIG. 2C, the region where the pre-pit 600 is formed (prepit formation region) is located on the inner peripheral side of the region where the image recording layer is formed (image recording layer formation region 602). May be. Being on the inner circumference side has the advantage of easy signal detection because the prepits are not filled with dye compounds.
- the outermost periphery of the pit formation region and the outermost region of the region where the image recording layer is formed are used.
- a margin area is required between the inner periphery and the inner periphery.
- the region where the prepit 600 is formed and the image recording layer 524 formed thereon may partially overlap. That is, at least a part of the image recording layer 524 may be formed on the prepit 600. In this case, since the formation position of the image recording layer 24 can be set relatively freely, the yield in the manufacturing process is improved.
- the prepit when the prepit is provided on the inner periphery of the substrate, it is preferably provided within a radius of 21 to 24 mm from the center of the substrate.
- the average depth h of the pre-pits 600 is 100 to 400 nm. 100-40
- the signal amplitude of the detection signal is increased, and the signal reading accuracy can be increased.
- the prepit average depth h will be described in more detail.
- the average prepit depth h is preferably 100 to 250 nm, and more preferably 100 to 170 nm.
- the signal characteristics are excellent as compared with the case where a dye recording layer is formed on the pre-pit formation area! / Because of this, prepit shape design can be widened.
- the average depth h of the prepit is preferably 150 to 400 nm.
- the laser return light is affected by the dye, and thus the above range is preferable from the viewpoint of increasing the signal reading accuracy.
- the average half-value width W in the radial direction of the prepit 600 is preferably 200 to 500 nm, more preferably 250 to 450 nm, and even more preferably 390 to 440 nm. 2
- the wavelength is 50 to 450 nm, a sufficient signal amplitude with a small crosstalk in the direction between tracks can be obtained.
- the circumferential length (half width) of the pre-pit 600 is appropriately set because it depends on the information to be recorded.
- the ratio (h / h) of the average thickness h of the image recording layer 524 on the concave portion 600B of the base 600 is from 0.1 to
- the depth (h + h ⁇ h) of the image recording layer 524 on the concave portion of the prepit 600 is 70 to 250 nm.
- the surface on which 526 is formed has moderate irregularities for the laser to read the signal, and a good reproduction signal can be obtained.
- a more preferable range of “h Zh” is 0.2 to 0.8.
- a more preferable range of “h + h—h” is 100 to 200 nm, more preferably 120 to 1 p 1 2.
- the average half-value width W in the direction is within the above-described preferable range.
- the reflection layer 526 is formed along the image recording layer 524, and the average thickness t of the reflection layer 526 on the convex portion 600A of the prepit 600 , Prepit 6
- the ratio (t / ⁇ ) to the average thickness t of the reflective layer on the concave portion 600B of 00 is 0.8 to 1.2.
- it is 0.9 to 1.1.
- h, h, h, and the like are p 1 2 from AFM, transmission spectrum, and ellipsometer.
- the cross-section of the completed optical disk can be changed to SEM. It can be determined by observing more.
- an AFM device SPI3800N / SPA500 manufactured by Seiko Instruments Inc.
- a probe NCH-10V manufactured by Nippon Biko Co., Ltd.
- a substrate having prepits as described above can be manufactured using the stamper of the present invention.
- the stamper of the present invention is provided with irregularities for forming the above-described prepits.
- the average height of the projections among the projections and depressions is preferably 150 to 400 nm.
- a process for manufacturing the stamper a process substantially similar to that for manufacturing a normal CD-ROM stamper can be employed. Specifically, a stamper can be produced by depositing a photoresist on a glass master, performing development, sputtering a metal such as nickel, and performing electrolysis.
- the above optical disc is irradiated with laser light multiple times on a substantially identical locus, or laser light oscillates in the radial direction of the optical disc and is emitted multiple times on substantially the same locus.
- the apparatus can sufficiently recognize the information on the optical disk, and the recording of the visible information proceeds smoothly.
- the optical disc having the specific pre-pits is an optical disc for CD use (laser wavelength 700 ⁇ ! ⁇ 8 OOnm), DVD use (laser wavelength 600nm ⁇ 700nm), Blu-ray disc and HD DVD use (laser wavelength 380nm ⁇ 450nm). Can also be used for! Since these devices have the specific pre-pits, the signal detection of the optical disc is performed smoothly.
- the optical disc having the specific pre-pit is preferably used for an optical disc apparatus for DVD use.
- Optical disk devices for DVD use have a laser wavelength of 600 nm to 700 nm, so they are not very suitable for signal detection of prepits. However, in the case of the above specific prepits, it is sufficient even if the laser wavelength is 600 nm to 7 OOnm. Since the signal can be detected, visual information can be recorded smoothly.
- the configuration of the optical disc of the present invention has the above-described pre-pits and an image recording layer. If it is the structure to perform, it will not specifically limit. That is, it can be any of a read-only type, a write-once type, a rewritable type, and the like. Of these, the write-once type is preferable.
- the recording format is not particularly limited, such as phase change type, magneto-optical type, and dye type. Of these, the pigment type is preferable.
- examples of the layer configuration of the optical disc of the present invention include the following configurations.
- the first layer configuration is a configuration in which an information recording layer, a reflective layer, and an adhesive layer are sequentially formed on a first substrate, and a second substrate having an image recording layer is bonded onto the adhesive layer.
- an information recording layer, a reflective layer, a protective layer, and an adhesive layer are sequentially formed on the first substrate, and a second substrate having an image recording layer is pasted on the adhesive layer. Configuration to match.
- the third layer structure is a second layer in which an information recording layer, a reflective layer, a protective layer, an adhesive layer, and a protective layer are sequentially formed on a first substrate, and an image recording layer is provided on the protective layer.
- an information recording layer, a reflective layer, a protective layer, an adhesive layer, a protective layer, and a reflective layer are sequentially formed on the first substrate, and an image recording layer is formed on the reflective layer.
- an information recording layer, a reflective layer, an adhesive layer, and a reflective layer are sequentially formed on a first substrate, and a second substrate having an image recording layer is formed on the reflective layer.
- an information recording layer, a reflective layer, and a protective layer are sequentially formed on the first substrate, while an image recording layer, a reflective layer, and a protective layer are sequentially formed on the second substrate.
- each layer may be composed of one layer or a plurality of layers.
- the substrate and each layer will be described. In the following description, the first substrate and the second substrate may be collectively referred to simply as “substrate”.
- the present invention is preferably applied to the configuration of DVD (including DVD-R, DVD-RW, HD DVD, etc. in addition to DVD).
- DVD including DVD-R, DVD-RW, HD DVD, etc. in addition to DVD.
- it is a bonded optical disc, and at least image recording is performed on the surface side on which the information recording layer is formed on one substrate and the prepits are formed on the other substrate. It is the structure which has a layer and these were bonded together.
- the information recording layer is a layer in which information is recorded and reproduced by a laser beam used for recording and reproduction.
- code information such as digital information is recorded.
- the information recording layer may be a dye recording layer or a phase change recording layer, but a dye recording layer is preferred.
- dyes contained in the dye recording layer include cyanine dyes, oxonol dyes, azo dyes, phthalocyanine dyes, triazole compounds (including benzotriazole compounds), triazine compounds, merocyanine compounds.
- the optical information recording medium is "CD-R”
- cyanine dyes, azo dyes, and phthalocyanine dyes are preferred "DVD-R”
- cyanine dyes, oxonol dyes In the case of Blu-ray Disc and HD DVD, where azo dyes (including Ni and Co complexes) and pyromethene compounds are preferred, cyanine dyes, oxonol dyes, azo dyes, phthalocyanine dyes, benzotriazole compounds, triazine compounds Is preferred.
- CD-R cyanine dyes, azo dyes and phthalocyanine dyes are more preferred.
- DVD-R cyanine dyes, oxonol dyes and azo dyes (including Ni and Co complexes) are used.
- cyanine dyes, oxonol dyes, azo dyes, and phthalocyanine dyes are more preferable.
- the information recording layer is prepared by dissolving a recording substance such as a dye in a suitable solvent together with a binder and the like. Next, the coating solution is applied onto a substrate to form a coating film, and then dried.
- concentration of the recording substance in the coating solution is generally 0.01 to 15% by mass. The range is preferably from 0.1 to 10% by mass, more preferably from 0.5 to 5% by mass, and most preferably from 0.5 to 3% by mass.
- the information recording layer is preferably formed by force solvent coating which can be performed by a method such as vapor deposition, sputtering, CVD, or solvent coating.
- Examples of the solvent of the coating solution include esters such as butyl acetate, ethyl lactate, and cellosolve acetate; ketones such as methyl ethyl ketone, cyclohexanone, and methyl isobutyl ketone; dichloromethane, 1,2-dichloroethane, and chloroform.
- esters such as butyl acetate, ethyl lactate, and cellosolve acetate
- ketones such as methyl ethyl ketone, cyclohexanone, and methyl isobutyl ketone
- dichloromethane 1,2-dichloroethane, and chloroform.
- Chlorinated hydrocarbons such as mouth form; Amides such as dimethylformamide; Hydrocarbons such as methylcyclohexane; Etherenoles such as dibutyl ether, jetinoreethenole, tetrahydrofuran and dioxane; Ethanol, n-propanol, isopropanol, n-butanol , Alcohols such as diacetone alcohol; fluorinated solvents such as 2, 2, 3, 3-tetrafluoropropanol; ethylene glycol nomonomethylenotenole, ethyleneglycolenomonotenenoatenore, propylene glycol Rumonome Ether and the like glycol ethers, such as.
- the above solvents may be used alone or in combination of two or more in consideration of the solubility of the dye used.
- Various additives such as anti-oxidation agents, UV absorbers, plasticizers and lubricants may be added to the coating solution depending on the purpose.
- binder examples include natural organic polymer substances such as gelatin, cellulose derivatives, dextran, rosin and rubber; and hydrocarbons such as polyethylene, polypropylene, polystyrene and polyisobutylene.
- Poly-based resin Poly-salt-bulu, Poly-salt-vinylidene, Poly-salt-bule ⁇ Polyacetate-bull copolymer, etc.
- Vinyl-based resins Acrylics such as polymethyl acrylate and polymethyl methacrylate
- Synthetic organic polymers such as polybutyl alcohol, chlorinated polyethylene, epoxy resin, butyral resin, rubber derivatives, initial condensates of thermosetting resins such as phenol-formaldehyde resin.
- the amount of binder used is generally in the range of 0.01 to 50 times the mass of the dye, preferably 0.1 to It is in the range of 5 times the amount.
- Examples of the application method of the solvent application include a spray method, a spin coat method, a dip method, a roll coat method, a blade coat method, a doctor roll method, and a screen printing method.
- the information recording layer may be a single layer or a multilayer.
- the thickness of the information recording layer is generally in the range of 10 to 500 nm, preferably in the range of 15 to 300 nm, more preferably in the range of 20 to 150 nm.
- various anti-fading agents can be contained in order to improve the light resistance of the information recording layer.
- anti-fading agent singlet oxygen quencher is generally used.
- singlet oxygen quencher those already described in publications such as known patent specifications can be used.
- JP-A-58-175693 JP-A-58-175693, 59-31194, 60-18387, 60-19586, 60-19587, 60-35054, 60-36190, 60-36191, 60-44554, 60-4-4555, 60-44389, 60-44390, 60-54892, 60-47069, 68-209995, Special As described in various publications such as Kaihei 4-25492, Japanese Patent Publication 1-38680, and 6-26 028, German Patent 350399, and the Journal of the Japanese Society of Social Sciences, October 1992, page 1141 Things are included.
- the amount of the anti-fading agent such as the singlet oxygen quencher used is usually in the range of 0.1 to 50% by mass, preferably in the range of 0.5 to 45% by mass, based on the mass of the dye. More preferably, it is in the range of 3 to 40% by mass, particularly preferably in the range of 5 to 25% by mass.
- phase change type information recording layer examples include Sb Te alloy, Ge-Sb-Te alloy, Pd—Ge Sb—Te alloy, Nb Ge Sb—Te alloy, Pd—Nb Ge Sb—Te alloy, Pt—Ge Sb—Te alloy, Co—Ge Sb—Te alloy, In—Sb—Te alloy, Ag In—Sb Te alloy, Ag—V—In—Sb Te alloy, Ag Ge In—Sb Te alloy, etc. are included. Among these, Ge Sb—Te alloy and Ag—In—Sb—Te alloy are preferable because they can be rewritten many times.
- the thickness of the phase change information recording layer is preferably 10 to 50 nm, more preferably 15 to 30 nm.
- phase change information recording layer can be formed by a vapor phase thin film deposition method such as a sputtering method or a vacuum evaporation method.
- the first substrate and the second substrate of the optical disk of the present invention are used as substrates of conventional optical disks, and can be arbitrarily selected from various materials.
- the substrate material include acrylic resins such as glass, polycarbonate, and polymethyl methacrylate, polyvinyl chloride, salt vinyl resins such as salt vinyl copolymer, and epoxy resins. Fats, amorphous polyolefins, polyesters and the like are included, and these may be used together if desired. These materials can be used as a film or as a rigid substrate.
- polycarbonate is preferable from the viewpoints of moisture resistance, dimensional stability and price.
- the second substrate can be manufactured through a step of manufacturing a substrate having prepits on the side on which the image recording layer is formed, using the above-described stamper of the present invention.
- the height of the projection corresponding to the depth of the prepit can be controlled by adjusting the film thickness of the photoresist.
- the thickness of the first substrate and the second substrate is preferably 0.1 to 1.2 mm, more preferably 0.2 to 1.1 mm. 1. More preferably 1 mm. With 0.5 to 1.1 mm, for example, drawing with a laser mounted on DVD-R and DVD + R drives and DVD recorders becomes possible. Further, it is preferable that a servo signal for group or tracking is basically formed on the first substrate, and a substrate on which such a groove or servo signal for tracking is formed on the second substrate. May be used.
- the track pitch of the first substrate group is preferably in the range of 280 to 450 nm, and more preferably in the range of 300 to 420 nm.
- the depth of the group (groove depth) is preferably in the range of 15 to 150 nm, more preferably in the range of 25 to 100 nm.
- the second substrate may be provided with a tracking groove (groove).
- the group track pitch is preferably in the range of 0.3 to 200 m from the viewpoint of the intensity distribution of the recording laser, and more preferably in the range of 0.6 to LOO m. More preferably, the ratio is 0.7 to 50 / ⁇ ⁇ .
- the groove depth is 50 to 250 nm when tracking is performed during image recording and the thickness of the substrate on the laser incident side is 0.6 mm. More preferably, the thickness is 200 nm, and more preferably 100 to 180 nm.
- the width of the groove is preferably 100 to 600 nm, more preferably 200 to 500 nm, and even more preferably 250 to 450 nm.
- the groove shape depends on the wavelength of the laser beam, NA, and substrate thickness. However, the optimum range may be different.
- an undercoat layer may be provided on the first substrate surface (the side where the group is formed (the side where the pit is formed in the case of ROM)).
- the material for the undercoat layer examples include polymethylmethacrylate, acrylic acid 'methacrylic acid copolymer, styrene' maleic anhydride copolymer, polybulal alcohol, N-methylolacrylamide, styrene 'bulutoluene copolymer Polymers such as coalesced, chlorosulfonated polyethylene, nitrocellulose, polychlorinated butyl, chlorinated polyolefin, polyester, polyimide, butyl acetate 'butyl copolymer, ethylene' butyl acetate copolymer, polyethylene, polypropylene, polycarbonate; And surface modifiers such as silane coupling agents.
- the undercoat layer is prepared by dissolving or dispersing the above substances in an appropriate solvent to prepare a coating solution, and then applying the coating solution to the substrate surface by a coating method such as spin coating, dip coating, or etching coating. Can be formed.
- the thickness of the undercoat layer is generally in the range of 0.005 to 20 111, and preferably in the range of 0.01 to 10 / ⁇ ⁇ .
- the second substrate in the visible image drawn on the image recording layer, it is preferable to subject the second substrate to a roughening treatment in order to prevent reflection of surroundings due to specular reflection light.
- an image recording layer of the second substrate is formed on one surface in contact with the second substrate using a stamper subjected to the roughening treatment.
- the surface to be processed is roughened.
- a roughening process is performed on a stamper used for manufacturing the second substrate.
- blasting such as sandblasting is performed to obtain a desired roughness.
- chemical processing as described in the fifth roughening processing may be performed.
- this stamper is placed in a mold so that the roughened surface is in contact with the resin material of the second substrate, and is molded by a known method, whereby the first surface having the roughened surface only on one surface. Two substrates are produced.
- the ten-point average roughness (Rz) of the surface is 0.3 to 5 ⁇ m, and the average of the roughness curve elements
- the length (RSm) force is preferably 10 to 500 ⁇ m.
- the second surface roughening treatment is performed by recording an image on the second substrate by using a molding die in which the surface roughening treatment is performed on one surface that contacts the second substrate after molding.
- the surface on which the layer is formed is roughened.
- a roughening process is performed on one main surface of the second substrate molding die.
- the roughening treatment method is the same as in the case of the first roughening treatment, and by using the mold and molding by a known method, the roughening surface is applied to only one surface.
- a second substrate having is produced.
- a resin in which fine particles are dispersed is applied to the surface on which the image recording layer is formed to cure the resin.
- the surface of the second substrate on which the image recording layer is formed is roughened.
- acrylate-based ultraviolet-cured resin, epoxy-based, isocyanate-based thermosetting resin, etc. can be used.
- the fine particles may be inorganic fine particles such as SiO and Al 2 O, polycarbonate, acrylic
- Fat particles or the like can be used.
- the volume average particle diameter of the fine particles is preferably from 0.3 to 200 / ⁇ ⁇ , more preferably from 0.6 to LOO / zm.
- the roughened surface can be made to have a desired roughness.
- the surface on which the image recording layer is formed is subjected to a machining process to obtain the image recording layer of the second substrate. This is to roughen the surface on which is formed.
- a machining process it is preferable to apply the sandblasting t, which is applicable to various treatments, and the tapping blasting process.
- the surface on which the image recording layer is formed is subjected to chemical treatment so that the image recording layer of the second substrate is The surface to be formed is roughened.
- chemical treatment a process of etching by applying a solvent to one surface of the second substrate after molding or spraying with a spray can be applied.
- the solvent an organic solvent such as dimethylformamide is preferable, and an acidic solvent combined with nitric acid, hydrochloric acid, and sulfuric acid can be used.
- the desired roughness can be obtained by adjusting the normality of the acidic solvent as described above or adjusting the coating time.
- First reflective layer, second reflective layer A first reflective layer and a second reflective layer are provided adjacent to the information recording layer and the image recording layer for the purpose of improving the reflectance during information reproduction.
- Light reflecting material is a material of the reflective layer is a substance high reflectance to a laser beam, examples of which, M g, Se, Y, Ti,
- the reflective layer can be formed on the substrate or the information recording layer, for example, by vapor deposition, sputtering, or ion plating of the light reflective material.
- the thickness of the reflective layer is generally in the range of 10 to 300 nm, and preferably in the range of 50 to 200 nm.
- the adhesive layer is a layer for bonding the first laminate 520 and the second laminate 528 in FIGS. 1A and 1B, and is provided between the first reflective layer 516 and the second reflective layer 526. To position.
- a known ultraviolet curable resin or the like can be used as the adhesive used for the adhesive layer.
- the optical disc of the present invention has the image recording layer on the surface opposite to the information recording layer.
- visible images visible information
- examples of visible images include disc titles, content information, content thumbnails, related pictures, design pictures, copyright information, recording date and time, recording method, recording format, and barcode.
- the visible image recorded in the image recording layer means a visually recognizable image, which is a character
- the image recording layer only needs to be able to record image information such as characters, images, and patterns in a visible manner by laser light irradiation. Considering that the pits are clearly formed, the image recording layer preferably contains a dye compound. As the constituent material, the dyes described in the information recording layer described above can be preferably used. In this case, in consideration of cost and the like, it is preferable that the image recording layer is formed by spin coating using a coating solution containing a dye compound! /.
- the component (dye or phase change recording material) of the information recording layer described above and the component of the image recording layer may be the same or different. Since the required characteristics are different between the recording layer and the image recording layer, it is preferable to make the constituent components different. Specifically, the constituent components of the information recording layer are preferably excellent in recording / reproducing characteristics, and the constituent components of the image recording layer are preferably those in which the contrast of the recorded image is high. In particular, when a dye is used, a cyanine dye, a phthalocyanine dye, an azo dye, an azo metal complex, or an oxonol dye is used in the image recording layer from the viewpoint of improving the contrast of a recorded image. It is preferable.
- leuco dyes can also be used. Specifically, crystal biolettra tatone; 3, 3 bis (1-ethyl-2-methylindole-3-yl) phthalide, 3- (4-demethylamino-2-ethoxyphenyl) -3— (1-ethyl) 2—Methylindole— 3—yl) phthalide compounds such as 4—azaphthalide; 3-cyclohexylmethylamino 6-methyl—7-linofluorane, 2— (2 chloroanilino) 6 dibutylaminofluorane , 3 Jetylamino 6-methyl 7-anilinofluorane, 3-Jetylamino 6-methyl 7 Xylidinofluorane, 2— (2 Chloroalino) 6 Jetylaminofluoran, 2 linolino 1 —Methyl 6 (N-ethylisopentylamino) fluorane, 3 Jetylamino 6
- the image recording layer is prepared by dissolving the above-described dye in a solvent to prepare a coating solution, and applying the coating solution. Can be formed.
- the solvent the same solvents as those used for the preparation of the coating solution for the information recording layer described above can be used.
- Other additives and coating methods are the same as those for the recording layer described above.
- the layer thickness of the image recording layer is preferably 0.01 to 200 ⁇ m, more preferably 0.05 to: LOO ⁇ m, more preferably 0.1 to 50 ⁇ m. More preferably.
- the image recording layer is a layer on which visible information is recorded by irradiating laser light multiple times on a substantially identical locus, and the visible light is detected by detecting the return light after irradiating the prepit with the laser light.
- the image recording layer is a layer in which visible light is recorded by laser light oscillating in the radial direction of the optical disk and irradiated multiple times on substantially the same trajectory. It is preferable that visible information is recorded by detecting the return light after the light irradiation.
- a protective layer may be provided for the purpose of physically and chemically protecting the first reflective layer, the information recording layer, the second reflective layer, the image recording layer, and the like.
- Examples of materials used for the protective layer include ZnS, ZnS-SiO, SiO, SiO, MgF, S
- Inorganic materials such as nO and Si N, thermoplastic resin, thermosetting resin, UV curable resin, etc.
- thermoplastic resin or a thermosetting resin it is possible to prepare a coating solution by dissolving these in a suitable solvent, and then apply and dry the coating solution. Can be formed.
- UV curable resin it can also be formed by applying this coating solution and curing it by irradiation with UV light.
- various additives such as an antistatic agent, an antioxidant and a UV absorber may be added according to the purpose.
- the thickness of the protective layer is generally in the range of 0.1 ⁇ m to lmm.
- the optical disc of the present invention information that can be reproduced by laser light is recorded on the first substrate.
- the present invention can be applied to a so-called read-only optical disc having recorded recording portions (pits).
- the printing area 702 is formed on the label surface, and the information area 704 and the image recording area (image recording layer) 706 are formed from the inner periphery inside the disk (on the label surface forming surface of the substrate 720). It is a top view which shows the made structure.
- the partial cross-sectional structure is as shown in FIG. 21, and an image recording area 706 and an information area 704 are formed between the substrate 710 and the substrate 720 from the outer peripheral side.
- a print region 702 is formed on the upper surface of the substrate 720.
- the print area 702 for example, a product name or a manufacturer name is printed.
- An example of the printing method is screen printing. As shown in FIG. 20, by forming a powerful printing area 702 at the innermost end, the innermost end of the optical disk is shielded, and the visual effect of the user can be enhanced.
- the information area 704 is an area where prepits according to the present invention are formed.
- a visible image as described above is drawn by laser light.
- rO which is the inner peripheral edge of the printing region 702
- rl which is the outer peripheral edge
- 21-23 mm (provided that rO is rl).
- the inner peripheral edge r2 of the information region 704 is preferably 19 to 22 mm
- the outer peripheral edge r3 is preferably 22 to 25 mm (where r2 and r3).
- r3 which is the inner peripheral edge of the image recording area 706 is preferably 22 to 25 mm
- r4 which is the outer peripheral edge corresponds to the outermost periphery of the image recording area 706 (where r3 ⁇ r4).
- optical disc of the present invention described above is an optical disc that can be used for the signal processing method, signal processing device, image drawing method, and optical disc recording device of the present invention described below.
- optical disk recording apparatus and image drawing method of the present invention will be described, and the signal processing method and signal processing apparatus of the present invention will be described through the description.
- recording of an image on the image recording layer and recording of optical information on the information recording layer can be performed by, for example, an optical disc drive (recording apparatus) having a recording function on both layers.
- an optical disc drive recording apparatus
- image recording After recording in one of the information recording layer and the information recording layer, the recording can be reversed and recording can be performed in the other layer.
- optical disk of the present invention can be used particularly suitably for the following apparatuses and methods.
- an optical disc recording apparatus in which the above-described optical disc of the present invention is suitably used is
- An optical disc recording apparatus for recording information by irradiating a laser beam onto a recording surface (for example, a dye recording layer (recording layer)) of an optical disc, and an optical pickup for irradiating the optical disc with a laser beam;
- An irradiation position adjusting means for adjusting an irradiation position of the laser beam on the optical disk by the optical pickup; and an optical disk in which the recording surface is formed on one surface and the image recording layer is formed on the other surface.
- Image formation control for controlling the optical pickup and the irradiation position adjusting means so that a visible image corresponding to image information is formed on the image recording layer of the optical disc when set so as to face the optical pickup.
- a beam spot control means for controlling the optical pickup so that a beam spot diameter of a laser beam irradiated by the optical pickup on the recording surface when recording is increased.
- the reflectance changes like an image in accordance with the change in absorbance of the image recording layer, and the image data is converted into image data.
- a corresponding visible image can be formed.
- the optical disc is rotated one time, and the laser beam is applied to the region larger and longer. Irradiation can be performed, and the time required for forming a visible image can be shortened.
- the above-described optical disk of the present invention can record a good visible image by such a method.
- the optical disc recording apparatus includes:
- An optical disc recording apparatus for recording information by irradiating a recording surface of an optical disc with laser light, the optical pickup for irradiating the optical disc with laser light, and the optical pickup.
- the irradiation position adjusting means for adjusting the irradiation position of the laser beam on the optical disk by the up-up, and the optical disk having the recording surface formed on one surface and the image recording layer formed on the other surface.
- the intensity of the laser beam irradiated by UP to the image recording layer is a first intensity at which the image recording layer hardly changes based on the image information, or is greater than the first intensity.
- Servo information for detecting information related to the laser light to be detected and controlling the optical pickup so that desired laser light is irradiated based on the detection result, and the image formation control means includes the image information.
- the optical pickup When the intensity of the laser light emitted by the optical pickup continuously reaches the second intensity in accordance with the control based on the control based on the control, the optical pickup
- the intensity of the irradiated laser beam is controlled to be the first intensity for a predetermined time
- the servo means is configured to detect the light based on a detection result of information relating to the laser beam irradiated at the first intensity. It is characterized by controlling the pickup.
- the reflectance changes like an image with the change in absorbance of the image recording layer, and the image data is converted into image data.
- a corresponding visible image can be formed.
- the laser is used regardless of the image data. Since the first intensity laser beam that hardly changes the image recording layer is irradiated for the light control, the laser beam control based on the irradiation result can be performed.
- the above-described optical disk of the present invention can record a good visible image by such a method.
- optical disc recording apparatus of another embodiment [0123] Further, the optical disc recording apparatus of another embodiment
- An optical disc recording apparatus that records information by irradiating a recording surface of an optical disc with laser light, the optical pickup for irradiating the optical disc with laser light, and the optical pickup.
- the irradiation position adjusting means for adjusting the irradiation position of the laser beam on the optical disk by the up-up, and the optical disk having the recording surface formed on one surface and the image recording layer formed on the other surface.
- Image forming control means for controlling the optical pickup and the irradiation position adjusting means so that a visible image corresponding to image information is formed on the image recording layer of the optical disk when set so as to face each other; and the optical disk Is set in the optical disc recording apparatus, the optical pickup of the optical disc is based on whether the surface of the optical disc facing the optical pickup is the image recording layer or the recording surface.
- a relative position adjusting means for adjusting a relative positional relationship between the facing surface and the optical pickup. It is a sign.
- the reflectance changes like an image with the change in absorbance of the image recording layer, and the image data is converted into image data.
- a corresponding visible image can be formed.
- the optical disc recording apparatus includes:
- An optical disc recording apparatus for recording information by irradiating a recording surface of an optical disc with laser light, an optical pickup for irradiating the optical disc with laser light, and laser light for the optical disc by the optical pickup And an irradiation position adjusting means for adjusting the irradiation position, and an optical disc in which the recording surface is formed on one surface and an image recording layer is formed on the other surface, and a guide groove is spirally formed on the recording surface.
- Image forming control means for controlling laser light emitted from the optical pickup so that a visible image to be formed is formed on the image recording layer of the optical disc. Further, the above-described optical disc of the present invention can record a good visible image even by such a method.
- An optical disc recording apparatus for recording information by irradiating a recording surface of an optical disc with laser light, an optical pickup for irradiating the optical disc with laser light, and a rotation driving means for rotating the optical disc And a clock signal output means for outputting a clock signal having a frequency corresponding to the rotational speed of the optical disk by the rotation driving means, and an optical disc force in which the recording surface is formed on one surface and the image recording layer is formed on the other surface.
- Means for controlling the optical pickup so that a visible image corresponding to image information is formed on the image recording layer of the optical disc when the image recording layer is set to face the optical pickup; The laser beam emitted from the optical pickup is controlled on the basis of the image information for each cycle of the clock signal by the signal output means.
- Image forming control means for detecting that the optical disk has been rotated once from a predetermined reference position by the rotation driving means; and forming the visible image on the image recording layer of the optical disk.
- the rotation detecting means detects that the optical disk has been rotated once from the predetermined reference position while being irradiated with the laser beam by the optical pickup, the irradiation position of the laser beam by the optical pickup is determined.
- the optical disk set in the optical disk recording apparatus is moved by a predetermined amount in a predetermined radial direction. It is characterized by comprising irradiation position adjusting means.
- the reflectance changes in an image-like manner with the change in absorbance of the image recording layer, and the image data is converted into image data.
- a corresponding visible image can be formed.
- laser light irradiation control for visible image formation is performed every period of the clock signal having a frequency corresponding to the rotation speed of the optical disk, that is, every time the optical disk rotates by a certain angle.
- a visible image having contents (for example, density) according to image data can be formed at a position at a certain angle.
- the above-described optical disc of the present invention can record a good visible image even by such a method.
- optical disc recording apparatus of another embodiment is identical to optical disc recording apparatus of another embodiment
- An optical disc recording apparatus for recording information by irradiating a recording surface of an optical disc with laser light, an optical pickup for irradiating the optical disc with laser light, and a rotation driving means for rotating the optical disc Rotation detecting means for detecting that the optical disk has been rotated once from a predetermined reference position by the rotation driving means, and the recording surface is formed on one surface and the image recording layer is formed on the other surface.
- Optical disc force Image forming control for controlling the optical pickup so that a visible image corresponding to image information is formed on the image recording layer of the optical disc when the image recording layer is set to face the optical pickup. And a laser beam irradiated by the optical pickup to form the visible image on the image recording layer of the optical disc.
- the position of the laser beam irradiated by the optical pickup is set in the optical disk recording device.
- Irradiation position adjusting means for moving a predetermined amount in a predetermined radial direction of the optical disk, and the image formation control means is configured to move from the predetermined reference position of the image recording layer of the optical disc rotated by the rotation driving means.
- the optical pickup is irradiated with a laser beam, while the irradiation force of the laser beam is a position force ahead of the predetermined reference position of the optical disc by a predetermined amount.
- the optical pickup is controlled so that the laser beam for forming the visible image is not irradiated to the region up to the reference position. It is characterized by ing.
- the reflectance changes like an image with the change in absorbance of the image recording layer, and the image data is converted into image data.
- a corresponding visible image can be formed.
- a visible image is formed by irradiating a reference position force laser beam of the optical disc while rotating the optical disc, and a region immediately before the laser beam irradiation position returns to the reference position. The laser beam irradiation for forming a visible image is not performed.
- the laser beam irradiation position control is disturbed for some reason, such as the rotation of the optical disk becoming unstable, and the optical disk is rotated once by continuously irradiating the laser beam from the reference position. Even if the laser beam irradiation position moves to a position that passes through the position, that is, the position that overlaps with the position where the laser beam has already been irradiated later, the laser beam for forming a visible image is at that position. Irradiation can be suppressed and the quality of the visible image formed as a result can be prevented from deteriorating.
- an optical disc recording apparatus includes:
- An optical disc recording apparatus for recording information by irradiating a recording surface of an optical disc with a laser beam, an optical pickup for irradiating the optical disc with a laser beam, and a laser beam for the optical disc by the optical pickup
- An irradiation position adjusting means for adjusting the irradiation position of the optical disc
- a disc identification means for acquiring disc identification information for identifying the type of the optical disc set in the optical disc recording apparatus, and the recording surface on the other side.
- a means for controlling the optical pickup and the irradiation position adjusting means so as to be formed; Ru is characterized by including an image forming control unit for controlling the optical pickup and the irradiation position adjusting means according to the type of light Dace click that is.
- optical disc recording apparatus of another embodiment [0133] Further, the optical disc recording apparatus of another embodiment
- An optical pickup that irradiates the optical disk with laser light, a modulation unit that modulates information supplied from the outside, and a laser that is irradiated from the optical pickup in accordance with the information supplied from the modulation unit
- an optical disk recording apparatus comprising a laser beam control means for controlling light, a visible image is displayed on the image recording layer of an optical disk in which the recording surface is formed on one surface and the image recording layer is formed on the other surface.
- the laser light control means so that a visible image corresponding to the image information is formed on the image recording layer of the optical disc after being modulated by the modulation means.
- image forming control means for controlling the image forming apparatus.
- the reflectance changes like an image with the change in absorbance of the image recording layer, and the image data is converted into image data.
- a corresponding visible image can be formed.
- the image data is not modulated because the modulation by the modulation means for modulating the recording data is prohibited when information is recorded on the recording surface. . Therefore, it is possible to use a data transfer configuration for recording information on a recording surface without providing a special data transfer configuration for forming a visible image corresponding to the image data.
- An optical disc recording apparatus for recording information by irradiating a recording surface of an optical disc with laser light, an optical pickup for irradiating the optical disc with laser light, and laser light for the optical disc by the optical pickup
- An irradiation position adjusting means for adjusting the irradiation position of the optical disk, and an optical disc having the recording surface formed on one surface and an image recording layer formed on the other surface.
- the image recording layer was set to face the optical pickup.
- the visible image corresponding to the image information is formed on the image recording layer of the optical disc.
- An optical pickup and an image formation control means for controlling the irradiation position adjusting means, wherein the image formation control means is a laser beam emitted from the optical pickup in accordance with the gradation level indicated in the image information. It is characterized by controlling.
- the reflectivity changes like an image in accordance with the change in absorbance of the image recording layer, and the image data is converted into image data.
- a corresponding visible image can be formed.
- laser light control can be performed according to the gradation of each position (coordinate) on the image recording layer indicated by the image data, and a visible image with gradation expression can be formed. can do.
- An optical disk recording apparatus that records information by irradiating a recording surface of an optical disk with laser light, the rotating means for rotating the optical disk, and the one surface with respect to the optical disk rotated by the rotating means And a means for adjusting the level of the laser beam emitted from the optical pickup when forming a visible image on the image recording layer.
- the first intensity that hardly changes the recording layer and the image recording layer of the optical disc, or almost no change to the recording layer.
- the level of the laser light emitted from the optical pickup so that the second intensity changes to change the color of the image recording layer.
- a laser beam level control means for adjusting the laser beam.
- information can be recorded on the optical disc of the present invention by irradiating the recording layer with laser light in the same manner as in the past, and visible on the image recording layer.
- An image can be formed.
- information recording and visible image formation can be performed by irradiating laser light with the same surface force of the optical disc, the user has to bother to turn the optical disc over and set it again. No need to work ⁇
- the optical disc recording apparatus of an embodiment includes:
- An optical disc recording apparatus for recording information by irradiating a recording surface of an optical disc with laser light, an optical pickup for irradiating the optical disc with laser light, and the optical pickup.
- the irradiation position adjusting means for adjusting the irradiation position of the laser beam on the optical disk by the backup, and the optical pickup and the irradiation position adjusting means are controlled so that a visible image corresponding to image information is formed on the recording surface of the optical disk.
- the intensity of the laser beam irradiated to the recording surface by the optical pickup is a first intensity at which the recording surface hardly changes based on the image information, or the first intensity.
- the image forming control means for controlling the recording surface to be one of the second intensities that change greatly, and information on the laser light irradiated to the optical disc by the optical pickup are detected, and the detection result And a servo means for controlling the optical pickup so that a desired laser beam is irradiated, and the image
- the composition control means when the intensity of the laser beam emitted from the optical pickup continuously reaches the second intensity in accordance with the control based on the image information exceeds the predetermined time Regardless of the control, the intensity of the laser light emitted from the optical pickup is controlled to be the first intensity for a predetermined time, and the servo means detects information relating to the laser light emitted at the first intensity.
- the optical pickup is controlled based on the result.
- the reflectance of the recording layer is changed like an image to form a visible image corresponding to the image data. can do.
- the laser beam is used regardless of the image data. Since the recording surface is irradiated with laser light of the first intensity that hardly changes, the laser light control based on the irradiation result can be performed.
- the above-described optical disk of the present invention can record a good visible image by such a method.
- the image forming method on the image recording layer of the optical disc in the present invention uses an optical disc recording apparatus having an optical pickup for recording information by irradiating the recording surface of the optical disc with laser light, and using the optical disc recording device.
- the optical pickup irradiates the optical pickup so that a visible image corresponding to the image information is formed on the image recording layer of the optical disc.
- the optical disc is divided into a plurality of pieces.
- Each of the paths belonging to the unit area so that the unit area is an area including the plurality of adjacent constant paths (s) belonging to each of the fan-shaped portions, and the shade of the unit area in the visible image is expressed. It is characterized by controlling the irradiation timing of the laser beam applied to the laser beam.
- the reflectance changes like an image with the change in absorbance of the image recording layer, and the image data is converted into image data.
- a corresponding visible image can be formed.
- laser light irradiation timing control according to the gradation level of each position (coordinate) on the image recording layer indicated in the image data can be performed, and the visible image in which gradation expression is made. Can be formed.
- An optical disc recording device is an optical disc recording device that records information by irradiating a recording surface of an optical disc with laser light. In addition to recording information on such a recording surface, image recording is performed on the surface opposite to the recording surface. It has a function of forming a visible image corresponding to image data by irradiating the image recording layer of the optical disc on which the layer is formed with laser light. In such an apparatus, a visible image can be recorded not only on an image recording layer but also on a recording layer for recording normal digital data on an optical disk using a predetermined dye.
- FIG. 3 is a block diagram showing the configuration of the optical disk recording apparatus.
- this optical disk recording apparatus 100 is connected to a host personal computer (PC) 110, and has an optical pickup 10, a spindle motor (rotation drive means) 11, and an RF (Radio Frequency) amplifier. 12, servo circuit 13, decoder 15, controller 16, encoder 17, strategy circuit 18, laser driver 19, laser power control circuit 20, frequency generator 21, stepping motor 30, , Motor driver 31, motor controller 32, PLL (Phase Locked Loop) circuit 33, FIFO (First In First Out) memory 34, and drive pulse generation Part 35 and a nother memory 36.
- PC personal computer
- PLL Phase Locked Loop
- FIFO First In First Out
- the spindle motor 11 is a motor that rotationally drives the optical disc D that is a target of data recording, and the rotation speed thereof is controlled by the servo circuit 13.
- recording or the like is performed by the CAV (Constant Angular Velocity) method, and therefore the spindle motor 11 has a constant angular velocity set by an instruction from the control unit 16 or the like. It starts to rotate.
- the optical pickup 10 is a unit that irradiates the optical disk D rotated by the spindle motor 11 with laser light, and its configuration is shown in FIG. As shown in the figure, the optical pickup 10 receives reflected light from a laser diode 53 that emits a laser beam B, a diffraction grating 58, an optical system 55 that focuses the laser beam B on the surface of the optical disc D, and the like. And a light receiving element 56.
- the laser diode 53 emits a laser beam B having an intensity corresponding to the drive current when supplied with a drive current from the laser driver 19 (see FIG. 3).
- the optical pickup 10 separates the laser beam B emitted from the laser diode 53 into a main beam, a preceding beam, and a following beam by a diffraction grating 58, and these three laser beams are polarized beam splitter 59 and collimator lens 60.
- the light is condensed on the surface of the optical disc D through the 1Z4 wavelength plate 61 and the objective lens 62.
- the three laser beams reflected on the surface of the optical disc D are transmitted again through the objective lens 62, the 1Z4 wavelength plate 61, and the collimator lens 60, reflected by the polarizing beam splitter 59, and passed through the cylindrical lens 63.
- the light is incident on the light receiving element 56.
- the light receiving element 56 outputs the received signal to the RF amplifier 12 (see FIG. 3), and the light receiving signal is supplied to the servo circuit 13 through the RF amplifier 12.
- the objective lens 62 is held by the focus actuator 64 and the tracking actuator 65, and can move in the optical axis direction of the laser beam B and the radial direction of the optical disc D! /,
- the Each of the focus actuator 64 and the tracking actuator 65 moves the objective lens 62 in the optical axis direction and the radial direction according to the focus error signal and tracking error signal supplied from the servo circuit 13 (see FIG. 3). Move.
- the servo circuit 13 receives the light receiving signal supplied via the light receiving element 56 and the RF amplifier 12.
- the focus error signal and tracking error signal are generated based on the signal, and the objective lens 62 is moved as described above to perform focus control and tracking control.
- the optical pickup 10 has a front motor diode (not shown), and when the laser diode 53 emits laser light, the front motor diode that has received the emitted light. Is generated from the optical pickup 10 and supplied to the laser power control circuit 20 shown in FIG.
- the RF amplifier 12 amplifies the EFM (Eight to Four Modulation) RF signal supplied from the optical pickup 10, and outputs the amplified RF signal to the servo circuit 13 and the decoder 15.
- the decoder 15 performs EFM demodulation on the EFM-modulated RF signal supplied from the RF amplifier 12 during reproduction to generate reproduction data.
- the servo circuit 13 is supplied with an instruction signal from the control unit 16, an FG pulse signal with a frequency corresponding to the number of revolutions of the spindle motor 11 supplied from the frequency generator 21, and an RF signal of RF amplifier 12 power. Is done.
- the servo circuit 13 performs rotation control of the spindle motor 11 and focus control and tracking control of the optical pickup 10 based on these supplied signals.
- the driving method of the spindle motor 11 when recording information on the recording surface of the optical disk D (see Fig. 1) or when forming a visible image on the image recording layer (see Fig. 1) of the optical disk D is as follows.
- the noffer memory 36 is supplied from the host PC 110 and corresponds to the information to be recorded on the recording surface of the optical disc D (hereinafter referred to as recording data ⁇ ⁇ ) and the visible image to be formed on the image recording layer of the optical disc D. (Hereinafter referred to as image data) is accumulated. Then, the recording data stored in the noffer memory 36 is output to the encoder 17 and the image data is output to the control unit 16.
- the encoder 17 performs EFM modulation on the recording data supplied from the nother memory 36 and outputs it to the strategy circuit 18.
- the strategy circuit 18 performs time axis correction processing on the EFM signal supplied from the encoder 17 and outputs the result to the laser driver 19.
- the laser driver 19 supplies a signal modulated according to the recording data supplied from the strategy circuit 18 and a laser diode 53 of the optical pickup 10 according to the control of the laser power control circuit 20 (see Fig. 4). To drive.
- the laser power control circuit 20 controls the laser power to which the laser diode 53 (see FIG. 4) force of the optical pickup 10 is also irradiated. Specifically, the laser power control circuit 20 controls the laser driver 19 so that a laser beam having a value that matches the target value of the optimum laser power instructed by the control unit 16 is emitted from the optical pickup 10.
- the laser power control by the laser power control circuit 20 performed here uses the current value supplied from the front monitor diode of the optical pickup 10 so that the laser light of the target intensity is emitted from the optical pickup 10. It is feedback control to control to.
- the image data supplied from the host PC 110 and stored in the buffer memory 36 is supplied via the control unit 16 and sequentially stored.
- the image data stored in the FIFO memory 34 that is, the image data supplied from the host PC 110 to the optical disc recording apparatus 100 includes the following information.
- This image data is used to form a visible image on the surface of the disk-shaped optical disk D. As shown in Fig. 5, n images on a number of concentric circles centered on the center of the optical disk D are used. For each of the coordinates (indicated by black dots in the figure), information indicating the gradation (shading) is described.
- the image data includes coordinate points Pl l, P12...
- FIG. 5 is a diagram schematically showing the positional relationship between the coordinates, and actual coordinates are arranged more densely than what is shown.
- the host PC110 creates image data to be formed on the photosensitive surface of the optical disc D in the bitmap format that is generally used.
- the bitmap data may be converted into the data in the polar coordinate format as described above, and the converted image data may be transmitted from the host PC 110 to the optical disc recording apparatus 100.
- the FIFO memory 34 When a visible image is formed on the image recording layer of the optical disc D based on the image data supplied as described above, the FIFO memory 34 is supplied with an image recording image from the PLL circuit 33. Clock signal is supplied. Each time the clock pulse of the image recording clock signal is supplied, the FIFO memory 34 outputs to the drive pulse generation unit 35 information indicating the gradation degree of one of the coordinates accumulated first. Yes.
- the drive noise generation unit 35 generates a drive pulse for controlling the irradiation timing of the laser light emitted from the optical pickup 10.
- the drive pulse generation unit 35 generates a drive pulse having a pulse width corresponding to information indicating the gradation for each coordinate supplied from the FIFO memory 34. For example, when the gradation of a certain coordinate is relatively large (when the density is high), a drive pulse with a larger light level (second intensity) pulse width is generated as shown in the upper part of FIG. For coordinates with relatively small furniture, a drive pulse with a reduced write-level pulse width is generated as shown in the lower part of Fig. 6.
- the light level is a power level at which a change occurs in the image recording layer when the image recording layer of the optical disc D is irradiated with the laser power at that level, and the reflectivity changes clearly.
- the laser driver 19 When a simple driving pulse is supplied to the laser driver 19, the laser light at the light level is emitted from the optical pickup 10 for a time corresponding to the pulse width. Therefore, when the gradation is large, the light level laser beam is irradiated for a longer time, and the reflectance changes in a larger area in the unit area of the image recording layer of the optical disc D. This area is visually recognized as a dark area.
- the gradation shown in the image data is expressed by varying the length of the region whose reflectance is changed per unit region (unit length) in this way.
- the servo level (first intensity) is a power level at which the image recording layer hardly changes when the image recording layer of the optical disc D is irradiated with the laser power of that level, and it is necessary to change the reflectance. If you don't irradiate the light level laser light to the unexposed area, irradiate the servo level laser light.
- the drive pulse generator 35 generates a powerful drive pulse with information indicating the gradation for each coordinate as described above, and also performs laser power control by the laser power control circuit 20 and a servo circuit 13.
- a light level pulse or a servo level pulse for a very short period is inserted, regardless of the information indicating the above gradation levels.
- a light level pulse or a servo level pulse for a very short period is inserted, regardless of the information indicating the above gradation levels.
- the time T1 is longer than the predetermined servo cycle ST for controlling the laser power, the time t is very short when the servo cycle ST has elapsed since the write level pulse was generated. Insert the servo off pulse (SSP1).
- SSP1 servo off pulse
- Servo level pulse is generated and servo servo pulse (SSP2) is inserted after force servo cycle ST.
- the laser power control by the laser power control circuit 20 is based on the current (irradiation) supplied from the front monitor diode that has received the laser beam 53 (see Fig. 4). This is based on the current of a value corresponding to the intensity of the laser beam. More specifically, as shown in FIG. 8, the laser power control circuit 20 samples and holds a value corresponding to the intensity of the irradiated laser beam received by the front motor diode 53a as described above ( S201, S202). Then, when irradiation is performed using the light level as a target value, that is, when a light level drive pulse (see FIGS. 6 and 7) is generated, the light is supplied from the control unit 16 based on the sample and hold result.
- Laser power control is performed so that the laser light of the light level target value is irradiated (S203). Also, when irradiation is performed with the servo level as a target value, that is, when a servo level drive pulse (see FIGS. 6 and 7) is generated, it is supplied from the control unit 16 based on the result of sample and hold. Laser power control is performed so that the laser beam with the target servo level value is irradiated (S204). Therefore, write level or servo level pulses are not continuously output for longer than the predetermined servo cycle ST (sample cycle).
- the servo off-pulse SSP1 and the servo on-pulse SSP2 are forcibly inserted regardless of the contents of the image data so that the laser power control can be performed for each level as described above. It is.
- the servo off-pulse SSP1 is inserted not only for controlling the laser power but also for performing focus control and tracking control by the servo circuit 13.
- tracking control and focus control are performed by the RF signal received by the light receiving element 56 (see FIG. 4) of the optical pickup 10, that is, the laser beam emitted from the laser diode 53 and the return light (reflected light) from the optical disc D.
- FIG. 9 shows an example of a signal received by the light receiving element 56 when the laser beam is irradiated.
- the reflected light when irradiated with light level laser light includes the peak part Kl at the rise of the laser light, and the shoulder part ⁇ 2 where the level becomes constant thereafter, and is indicated by the diagonal line in the figure.
- the portion shown is considered to be the energy used for image formation of the image recording layer.
- the energy used for image formation of such an image recording layer is not always a stable value, and may vary depending on various situations. Therefore, it is conceivable that the shape of the shaded area in the figure changes each time, that is, the reflected light of the light level laser beam is not always stable and has a lot of noise, and this reflected light is used. This may hinder accurate focus control and tracking control. Therefore, as described above, when the light level laser beam is continuously irradiated for a long time, the reflected laser beam cannot be obtained, and accurate focus control and tracking control cannot be performed. It will end.
- the reflected light of the servo-level laser light can be periodically acquired, and focus control and tracking control are performed based on the acquired reflected light. Is executed.
- the target value for tracking control is a fixed value (a constant offset voltage is set).
- such a control method is used for image information in the image recording layer. The present invention can be applied not only when forming the image information but also when forming image information on the recording surface.
- the recording surface if a material that changes not only the reflectance but also the coloration when irradiated with laser light is used for the recording surface (recording layer), an image can be formed on the recording surface as well as the image recording layer. is there.
- the original data cannot be recorded on the portion where the visible image is formed. Therefore, the area where data is recorded and the area where the visible image is formed are separated in advance. It is preferable to leave.
- the time for inserting the servo off-pulse SSP1 and servo off-pulse SSP2 as described above is the minimum time that does not interfere with the execution of various servos such as laser power control, tracking control, and focus control.
- various servos such as laser power control, tracking control, and focus control.
- the PLL circuit (signal output means) 33 multiplies the FG pulse signal having a frequency corresponding to the rotational speed of the spindle motor 11 supplied from the frequency generator 21, and a visible image to be described later.
- a clock signal used for forming is output.
- the frequency generator 21 outputs a FG pulse signal having a frequency corresponding to the spindle rotational speed by using the back electromotive current obtained by the motor driver of the spindle motor 11. For example, as shown in the upper part of FIG. 10, the frequency generator 21 generates eight FG pulses while the spindle motor 11 rotates once, that is, the optical disk D rotates once.
- the PLL circuit 33 outputs a clock signal obtained by multiplying the FG pulse (for example, a frequency that is 5 times the FG pulse signal, and 40 high-level pulses during one rotation of the optical disk D). That is, a clock signal having a frequency corresponding to the rotational speed of the optical disk D rotated by the spindle motor 11 is output.
- the clock signal power PLL circuit multiplied by the FG pulse signal is output to the FIFO memory 34, and the clock signal is output to the clock signal every cycle, that is, every time the disk D rotates by a certain angle.
- Data indicating the furniture is output from the FIFO memory 34 to the drive pulse generator 35.
- the PLL circuit 33 may be used to generate a clock signal multiplied by the FG pulse as described above
- the spindle motor 11 may be a motor with sufficiently stable rotational drive capability.
- a crystal oscillator is provided instead of the PLL circuit 33, and a clock signal obtained by multiplying the FG pulse as described above, that is, A clock signal having a frequency corresponding to the rotation speed of the optical disc D may be generated.
- the stepping motor 30 is a motor for moving the optical pickup 10 in the radial direction of the optical disk D set on the optical disk D.
- the motor driver 31 drives the stepping motor 30 to rotate by an amount corresponding to the pulse signal supplied from the motor controller 32.
- the motor controller 32 generates a pulse signal corresponding to the movement amount and the movement direction in accordance with the movement start instruction including the movement direction and movement amount of the optical pickup 10 in the radial direction, which is instructed by the control unit 16, and Output to driver 31.
- the stepping motor 30 moves the optical pickup 10 in the radial direction of the optical disk D, and the optical disk D rotates the optical disk D by the spindle motor 11. As a result, the laser light irradiation position of the optical pickup 10 is changed to various positions on the optical disk D.
- These components constitute the irradiation position adjusting means.
- the control unit 16 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and the optical disc recording apparatus 100 according to a program stored in the ROM. Each part of the apparatus is controlled to centrally control the recording process on the recording surface of the optical disc D and the image forming process on the image recording layer of the optical disc D.
- a CPU Central Processing Unit
- ROM Read Only Memory
- RAM Random Access Memory
- the configuration described above is the configuration of the optical disc recording apparatus 100 according to the present embodiment.
- the optical disc recording apparatus includes (1) means for recognizing a pre-pit or pre-group to obtain position information of an image drawing prohibited area, and (2) image drawing prohibited.
- Control means for controlling the image not to be drawn in the area, and obtains position information of the image drawing prohibited area recorded in the prep (or pre-group), and based on the information, The control image is drawn so that no image drawing is performed in the image drawing prohibited area.
- the image drawing method of the first aspect of the present invention corresponds to the above means (a) recognizes the position information of the image drawing prohibited area recorded in the prep or pre group, and (b) The recognized image drawing prohibition area includes control so as not to perform image drawing.
- the pre-pit area on the image recording layer side of the optical disc D rotated by the spindle motor 11 is irradiated with laser light by the optical pickup 10, and the obtained return light is detected.
- Read the pre-pit signal This means the signal processing described above It is the same as the means, and a means for reading out a known pre-pit signal can be applied.
- the read pre-pit signal is input to a decoder and decoded by the decoder to obtain pre-pit information (position information).
- image drawing is performed by controlling the image drawing prohibited area so as not to draw an image based on the position information of the image drawing prohibited area read by the means (1). Is executed.
- the position information of the image drawing prohibited area is stored in the ROM of the control unit, and the control unit reads the position information corresponding to the detected pre-pit signal in the ROM force, and the image drawing prohibited area is read into the image drawing prohibited area by the read position information. Draw as if ⁇ did not draw.
- optical disk recording apparatus when at least a part of the image recording layer is formed on the region where the prepits are formed, and in the second aspect of the present invention
- the optical disk recording apparatus has the following means, obtains information related to drawing recorded in the prepits, and draws an image based on the information. That is,
- the image drawing methods of the second and third aspects of the present invention include the following (a) to (d) corresponding to the above means (1) to (4).
- the means (1) irradiates the prepit area of the optical disc D rotated by the spindle motor 11 with a laser beam by the optical pickup 10, detects the return light obtained, and reads the prepit signal.
- Means. This means is the same as the signal processing means described above, and a means for reading a known pre-pit signal can be applied.
- the means (2) is a means for inverting the polarity of the prepit signal obtained by the means (1). As described above, in the optical disc according to the present invention, since the image recording layer exists in the upper layer of the prepit area, the image recording layer does not exist in the upper layer of the prepit area. Become.
- the signal is input to an existing decoder as it is, pre-pit information that can be read by the control unit cannot be generated. Therefore, the polarity of the signal is reversed and converted to a signal that would have been obtained when the image recording layer was read out and provided to the decoder.
- the positive polarity portion is converted to negative polarity and the negative polarity portion is converted to positive polarity so that the signal waveform is subject to positive and negative.
- the signal may be equalized before or after inverting the polarity of the pre-pit signal in (2).
- the means for inverting the polarity can be inverted by a known polarity inverter as long as it is a means for inverting the sign of the signal input in accordance with an instruction from the control unit.
- a prepit signal whose polarity is inverted is input to a decoder and decoded by the decoder to obtain prepit information.
- the signal whose polarity is inverted is an original signal that is read when the image recording layer is not present, and can be directly decoded by the decoder to obtain prepit information.
- the image is drawn in advance using pre-pit information such as the image drawing conditions that are recorded in advance.
- pre-pit information such as the image drawing conditions that are recorded in advance.
- the drawing conditions corresponding to the pre-pit information are tabulated in advance and stored in the ROM of the control unit, and the control unit reads the drawing conditions corresponding to the detected pre-pit information with reference to the table, and draws according to the read drawing conditions.
- the optical disc recording apparatus 100 can record information such as music data supplied from the host PC 110 on the recording surface of the optical disc D, and can also record information on the image recording layer of the optical disc D. A visible image corresponding to the image data supplied from the PC 110 can be formed.
- the operation of the optical disc recording apparatus 100 capable of performing processing such as information recording and visible image formation will be described with reference to FIG. 11 and FIG.
- the control unit 16 controls the optical pickup 10 and the like, and the format of the surface facing the optical pickup 10 of the optical disc D is set. Detect if it is an optical disc. For example, in the case of DVD-R, the land pre-pit signal or pre-record signal, and in the case of DVD + R, the presence or absence of ADIP (Address in Pregroove) is detected to determine whether it is the information recording surface (information recording layer) Do (Step Sal). If such information is recorded, it is not recognized as an optical disk.
- ADIP Address in Pregroove
- the control unit 16 determines that the optical disk D is set so as to face the optical pickup 10, and controls the recording surface to record the recording data supplied from the host PC 110 (step Sa2). Since the control for recording the recording data performed here is the same as that of a conventional optical disk recording apparatus (DVD-R or DVD + R drive apparatus), description thereof is omitted.
- the optical disk D is set so that the image recording layer faces the optical pickup 10.
- the control unit 16 determines whether it is possible to acquire the disk ID of the set optical disk D (step Sa3).
- the disk ID of optical disk D can be installed in the pre-pit signal. For example, as shown in FIG. 13, a visible image corresponding to information obtained by encoding a disc ID is described along the circumference of the outermost peripheral portion of the optical disc D on the image recording layer side. In FIG.
- the disk ID is assigned to the image recording layer of the optical disk D by forming a reflective area 301a and a non-reflective area 301b having a length corresponding to the code along the circumference of the outermost peripheral portion. Described in The control unit 16 traces the irradiation position of the laser beam of the optical pickup 10 along the outermost circumference of the optical disc D, and the reflected light power also acquires the disc ID.
- the reflection corresponding to the disc ID as described above is formed on the outermost peripheral portion of the image recording layer.
- the control unit 16 determines that the optical disk D is incapable of forming a visible image (step Sa4), and performs processing for notifying the user of that fact.
- the host PC 110 waits for an image formation instruction including image data (step Sa5), and when the image formation instruction is given.
- the control unit 16 performs initialization control for forming a visible image on the image recording layer of the optical disc D (step Sa6). More specifically, the control unit 16 controls the servo circuit 13 so that the spindle motor 11 is rotated at a predetermined angular velocity, or the optical pickup 10 is moved to the initial position on the innermost peripheral side in the radial direction of the optical disc D. An instruction to move to is sent to the motor controller 32, and the stepping motor 30 is driven.
- the position information of the image drawing prohibited area recorded in the prepit (pregroup) is recognized and recognized. It can be controlled not to perform image drawing in the image drawing prohibited area.
- the initial position of the optical pickup 10 is set as the innermost peripheral portion of the image drawing area in order to prevent drawing in the image drawing prohibited area in the above-described initialization. Can be controlled.
- control unit 16 irradiates the image recording layer of the optical disc D with a laser beam having a larger beam spot diameter than when recording information on the recording surface. It is also possible to instruct the servo circuit 13 for a target value for the correct focus control.
- the focus control content when the target value as described above is instructed will be described in more detail as follows.
- the focus control by the servo circuit 13 is performed based on the signal output from the light receiving element 56 of the optical pickup 10.
- the servo circuit 13 is arranged so that circular return light (A in the figure) is received at the center of the four areas 56a, 56b, 56c, 56d of the light receiving element 56 shown in FIG. Drive the focus actuator 64 (see Fig. 4).
- the image recording layer of the optical disc D is irradiated with laser light having a larger diameter than that during information recording on the recording surface. Focus control is performed.
- the shape of the return light received by the light receiving element 56 shown in FIG. 14 is an elliptical shape (B or C in the figure)
- the control unit 16 instructs the servo circuit 13 to set ⁇ (not 0), so that it is larger than when recording information on the recording surface.
- the image recording layer of the optical disc D can be irradiated with a laser beam having a spot diameter.
- the following effects can be obtained by irradiating laser light having a larger spot diameter than when recording information on the recording surface. That is, in this embodiment, when forming a visible image, the laser beam is irradiated while rotating the optical disc D, as in the case of recording information on the recording surface.
- a visible image can be formed on the entire area of the image recording layer of the optical disc D in a shorter time by increasing the beam spot diameter of the laser beam.
- the optical disc D is rotated once.
- the area of the image formation target is larger when the beam spot diameter BS is larger.
- the optical disk D must be rotated more in order to make the entire area the target of image formation (in the example shown, 4 rotations are large, 6 are small). Rotation), and it takes a lot of time for image formation.
- the optical disc recording apparatus 100 is configured to irradiate a laser beam with a spot diameter larger / than that during information recording when forming a visible image.
- the control unit 16 sets the target value of each level so that the optical pickup 10 emits the laser light of the write level and the servo level according to the acquired disk ID.
- the ROM of the control unit 16 stores the write level and the target value to be set as the servo level for each of the plurality of types of disk IDs.
- the control unit 16 stores the write level corresponding to the acquired disk ID. Then, the servo level target values are read out, and these target values are instructed to the laser power control circuit 20.
- the power target value is set in accordance with the disk ID as described above for the following reason.
- the characteristics of the dye in the image recording layer may differ depending on the type of optical disc D. If the characteristics differ, when the laser beam is irradiated to what power level, the reflectivity changes and the characteristics change naturally. It will be. For this reason, when the image recording layer of a certain optical disk D is irradiated with a laser beam at a certain light level, the reflectance of the irradiated area can be changed sufficiently. When the image recording layer is irradiated with laser light of the same light level, it is not always possible to change the reflectance of the irradiated area.
- the target values of the write level and the servo level that allow accurate image formation are obtained in advance by experiment for each optical disk corresponding to each of various disk IDs as described above. Then, by storing the calculated target value in the ROM in association with each disk ID, optimal power control can be performed according to the characteristics of the image recording layers of various optical disks D as described above. I can do it.
- control unit 16 When initialization control as described above is performed by the control unit 16, processing for actually forming a visible image on the image recording layer of the optical disc D is performed. As shown in FIG. 12, the control unit 16 first transfers the image data supplied from the host PC 110 via the buffer memory 36 to the FIFO memory 34 (step Sa7). Then, the control unit 16 determines whether the force passed through the laser beam irradiation position of the optical pickup 10 from the predetermined reference position force of the optical disk D rotated by the spindle motor 11 from the FG pulse signal supplied from the frequency generator 21. (Step Sa8).
- the frequency generator 21 outputs a predetermined number (8 in the example shown) of FG pulses while the spindle motor 11 rotates once, that is, while the optical disk D rotates once. Therefore, the control unit 16 outputs a reference position detection pulse by synchronizing one of the FG pulses supplied from the frequency generator 21 with the reference pulse and the rising timing, and thereafter, the reference position detection pulse.
- the reference position detection pulse signal that outputs the reference position detection pulse is generated in synchronization with the rising timing of the number of pulses for the first rotation (eighth in the example shown).
- the time when the pulse is generated is the timing when the laser light irradiation position of the optical pickup 10 has passed the reference position of the optical disc D. That is, as shown in FIG. 17, the laser beam irradiation position of the optical pickup 10 at the timing when the first reference position detection pulse is generated is indicated by a thick line in the figure (the optical pickup 10 is movable in the radial direction, so the irradiation position If the reference position detection pulse generated after one rotation is generated, the laser light irradiation position of the optical pickup 10 is naturally the bold line in the figure. It is in the position shown by.
- the radial line to which the laser beam irradiation position belongs is set as the reference position to the timing at which the reference position detection pulse is first generated, and the control unit 16 generates the optical disk D every rotation as described above. Based on the reference position detection pulse signal, it is possible to detect that the irradiation position of the laser beam has passed the reference position of the optical disc D.
- the alternate long and short dash line in the figure shows an example of the movement locus of the irradiation position of the laser beam from the generation of a reference position detection pulse to the generation of the next reference position detection pulse.
- the laser beam irradiates a substantially identical track on the optical disk a plurality of times.
- the substantially identical locus is a substantially concentric locus associated with the rotation of the optical disk.
- the optical pickup 10 preferably swings in the radial direction of the optical disk.
- the number of rotations when irradiating substantially the same trajectory varies depending on the required contrast. For example, when drawing is performed in the minimum time, it is 7 to 8 rotations.
- the drawing method according to the present invention is disclosed in JP-A-2002-203321. A method in which the laser beam irradiates a substantially identical locus on the optical disk a plurality of times and the laser beam oscillates is preferable.
- step Sa9 After receiving the image formation instruction from the host PC 110, when it is detected that the reference position of the optical disc D has passed the irradiation position of the laser beam by the above-described method, the control unit 16 sets a variable indicating the number of rotations. After incrementing R by 1 (step Sa9), it is determined whether R is an odd number (step SalO).
- R is set at step SalO. Is determined to be an odd number.
- the control unit 16 performs control to form a visible image by irradiating the image recording layer of the optical disc D with the laser beam from the optical pickup 10 (step Sal 1 ). More specifically, the control unit 16 sequentially outputs the image data from the FIFO memory 34 in synchronization with the clock signal output from the PLL circuit 33 from the time when the reference position detection pulse is received. Control each part. By this control, as shown in FIG.
- the FIFO memory 34 outputs information indicating the gradation level of one coordinate to the drive pulse generation unit 35, and drives it.
- the noise generation unit 35 generates a drive pulse having a pulse width according to the gradation shown in the information and outputs the drive pulse to the laser driver 19.
- the optical pickup 10 irradiates the image recording layer of the optical disc D with the laser beam at the light level for a time corresponding to the gradation of each coordinate, and the reflectance of the irradiated area changes.
- a visible image as shown can be formed.
- the irradiation position of the laser beam of the optical pickup 10 is one period of the clock signal (the pulse rising timing force).
- the region moves along the circumference by the area indicated by C in the figure.
- the gradation level varies depending on the region C as shown in the figure. The reflectance of different areas can be changed accordingly. In this way, by controlling the irradiation time of the light level laser light when passing through each region C according to the gradation of each coordinate, A visible image corresponding to the image data can be formed on the image recording layer of the optical disc D.
- Step Sa7 When the control for executing the formation of the visible image by the laser light irradiation controlled according to the image data as described above is executed, the process of the control unit 16 returns to Step Sa7 and is supplied from the buffer memory 36. The processed image data is transferred to the FIFO memory 34. Then, whether or not the laser beam irradiation position of the optical pickup 10 has passed through the reference position of the optical disk D is detected. If it is detected that the reference position has passed, 1 is incremented to R. As a result, when R becomes an even number, the control unit 16 controls each unit of the apparatus so as to stop the visible image formation by the laser light irradiation control as described above (step Sal2).
- the FIFO memory 34 is controlled not to output information indicating the gradation of each coordinate to the drive pulse generation unit 35 in synchronization with the clock signal supplied from the PLL circuit 33. That is, the control unit 16 irradiates the image recording layer of the optical disc D with a light level laser beam to form a visible image, and then reflects the image recording layer while the optical disc D rotates once. This is because the laser beam is not irradiated to change the rate.
- the control unit 16 instructs the motor controller 32 to move the optical pickup 10 to the outer peripheral side in the radial direction by a predetermined amount.
- the motor controller 32 drives the stepping motor 30 via the motor driver 31, and the optical pickup 10 is moved to the outer peripheral side by a predetermined amount.
- the predetermined amount by which the optical pickup 10 is moved in the radial direction of the optical disc D may be appropriately determined according to the beam spot diameter BS (see FIG. 15) irradiated from the optical pickup 10 as described above. . That is, when a visible image is formed on the image recording layer of the disk-shaped optical disc D, the laser beam irradiation position of the optical pickup 10 can be moved on the surface of the optical disc D with almost no gap to form a higher quality image. It is necessary to realize. Therefore, if the unit movement amount of the optical pickup 10 in the radial direction as described above is substantially the same as the beam spot diameter BS of the laser beam irradiated onto the optical disc D, the laser beam can be almost completely spaced on the surface of the optical disc D.
- the control unit 16 optically picks up the optical spot by approximately the same length as the beam spot diameter BS.
- the motor controller 32 is controlled to move the cup 10 in the radial direction, and the stepping motor 30 is driven.
- the stepping motor 30 in recent years can control the amount of movement in units of 10 m by using step technology. As described above, the optical pickup 10 can be moved to 20 ⁇ m using the stepping motor 30. Moving in the radial direction in units is sufficiently feasible.
- the control unit 16 changes the light level value of the target laser light at a light level that changes the laser light.
- the laser power control circuit 20 is instructed to the light level value after the change that should be targeted when irradiating the laser beam (step Sal4).
- a CAV method is employed in which the optical disc D is irradiated with laser light while rotating the optical disk D while maintaining a constant angular velocity as a method for forming a visible image. When moved to the side, the linear velocity increases.
- the optical pickup 10 when the optical pickup 10 is moved in the radial direction (outer peripheral side) in this way, the target value of the light level is changed so as to become larger than that point as described above, thereby Even if the speed changes, it is possible to irradiate the laser power with such an intensity that the reflectivity of the image recording layer of the optical disc D can sufficiently change.
- the control unit 16 does not process unprocessed image data, that is, for forming a visible image. It is determined whether or not there is image data not supplied to the drive pulse generator 35. If there is no image data, the process ends.
- step Sa7 the process returns to step Sa7 to continue the process for forming a visible image. That is, the image data is transferred from the control unit 16 to the FIFO memory 34 (step Sa7), and it is determined whether or not the irradiation position of the laser beam has passed through the reference position of the optical disc D (step Sa8). And standards When the position is passed, the variable R indicating the number of revolutions is incremented by 1 (step Sa9), and it is determined whether or not the force after incrementing R is an odd number (step SalO).
- the control unit 16 controls each part of the apparatus so that the laser light irradiation for forming a visible image as described above is performed.
- R is an even number
- the visible image is displayed.
- the laser beam irradiation to form the beam is stopped (servo-level laser beam is irradiated), and control such as the radial movement control of the optical pickup 10 and the change of the light level target value as described above are performed. That is, when the control unit 16 performs laser light irradiation (including the light level) for image formation on the optical disc D during a certain round, the laser beam irradiation for image formation is performed during the next round.
- the optical pickup 10 is controlled so that the optical pickup 10 moves in the radial direction during the lap.
- the irradiation position and the power value of the laser light irradiated with the control are performed.
- the laser beam irradiation for image formation can be executed after the irradiation position where the image is not formed while the intensity of the laser beam is stabilized and the intensity of the laser beam is stabilized. Therefore, it is possible to suppress degradation of the quality of the visible image formed due to the radial movement control of the optical pickup 10 as described above.
- the optical disc recording apparatus 100 in order to record information on a recording surface without newly installing printing means or the like.
- the image recording layer of the optical disc D on which the image recording layer is formed is irradiated with laser light to form a visible image corresponding to the image data. be able to.
- the optical disc in the first aspect of the present invention, can be controlled with respect to the configuration having the prepits in which the position information of the image drawing prohibited area is recorded.
- there is no such pre-pit the position information is recorded even if there is a pre-pit. It is also possible to control not to perform drawing.
- an optical disk recording apparatus is the above-described optical disk recording apparatus, wherein the formation region in the image recording layer of the optical disk is defined as an image. And a control means for controlling to draw an image only in the image drawing area.
- An image drawing method includes an image drawing area in which an image is drawn and an image drawing prohibited area in which image drawing is prohibited in an image recording layer area in advance. And controlling to draw an image only in the image drawing area.
- an image drawing area and an image drawing prohibited area in the image recording layer are determined in advance, and image drawing is not performed in the predetermined image drawing prohibited area, and control is performed so that an image is drawn only in the image drawing area.
- the inner peripheral radius of the image recording layer forming region is 20. Omm
- the image drawing region is predetermined as the inner peripheral radius of 20.5 mm
- An area up to 5 mm is preset as an image drawing prohibition area.
- the clock signal generated using the FG pulse generated according to the rotation of the spindle motor 11, that is, generated according to the rotation amount of the optical disk D Since the laser beam irradiation timing is controlled based on the clock signal, it is possible to grasp the laser beam irradiation position in the optical disk recording apparatus 100 without acquiring position information from the optical disk D side. Therefore, according to the optical disc recording apparatus 100, when the pre-group (guide groove) is formed in the image recording layer, it is necessary to use the optical disc D that has undergone special processing, etc. A pre-group, position information, and the like are formed in advance, and a visible image corresponding to the image data can be formed on the image recording layer.
- the information recording layer is of the dye type
- laser pickup force laser light is irradiated while rotating the above-mentioned unrecorded optical disk at a predetermined recording linear velocity.
- the dye of the information recording layer absorbs the light and the temperature rises locally, and a desired pit is generated and its optical characteristics are changed to record information.
- the recording waveform of the laser beam does not work with either a pulse train or a single pulse when forming one pit.
- the ratio to the actual recording length (pit length) is important.
- the pulse width of the laser beam is preferably 20 to 95% of the actual recording length. 30 A range of ⁇ 90% is more preferred. A range of 35-85% is even more preferred.
- the recording waveform is a pulse train, the sum is in the above range.
- the power of the laser beam varies depending on the recording linear velocity.
- the recording linear velocity is 3.5m Zs, 1 ⁇ : the range of LOOmW is preferred 3 ⁇ 50mW is more preferred 5 ⁇ 2 A range of OmW is more preferred.
- the laser beam power is preferred, and the range is 21/2 times each.
- the NA of the objective lens used for the pickup is 0.5.
- a semiconductor laser having an oscillation wavelength in the range of 350 to 850 nm can be used as the recording light.
- the information recording layer is a phase change type.
- the phase change type it is composed of the above-described materials, and the phase change between the crystalline phase and the amorphous phase can be repeated by irradiation with laser light.
- a focused laser light pulse is irradiated for a short time to partially melt the phase change recording layer.
- the melted portion is rapidly cooled by thermal diffusion and solidifies to form an amorphous recording mark.
- the recording mark portion is irradiated with laser light, heated to a temperature below the melting point of the information recording layer and above the crystallization temperature, and then cooled to crystallize the amorphous recording mark. Return to the unrecorded state.
- a substrate having spiral guide grooves (groups) was produced by injection molding.
- the guide groove has a depth of 130 nm, a full width at half maximum of 300 nm, The track pitch was 0.74 / zm.
- Prepare coating solution (1) by dissolving 50 g of the following “Dye A” in 100 ml of 2, 2, 3, 3-tetrafluoro-l-propanol. Spin this coating solution on the guide groove forming surface of the substrate.
- An information recording layer (average thickness: 80 m) was formed by coating.
- a silver reflective layer was formed on the information recording layer by sputtering, and a first disk was produced.
- Concavities and convexities (the height of the protrusions etc. are adjusted to correspond to the depth of the prepits listed in Table 1 below) to form prepits in the area of radius 21mm to radius 24mm.
- a stamper with a mirror surface outside the radius of 24 mm was manufactured in the same manner as the normal CD-ROM stamper as follows. First, a photoresist was formed on a glass master by spin coating and baked. After that, in response to the signal generated from the formatter by the laser beam recorder, the photoresist was irradiated only to the area inside the radius of 24 mm and then developed. A stamper was fabricated by sputtering nickel on the substrate and using an electric furnace.
- a substrate having a thickness of 0.6 mm was produced by injection molding using the stamper.
- Table 1 below shows the depth and width of the prepits formed by stamper transfer.
- "Dye B" represented by the following chemical formula 1.
- 40g and "Dye C” 0.60g represented by the following chemical formula were dissolved in 100ml of 2,2,3,3-tetrafluorine 1-propanol.
- the coating solution (2) thus prepared was applied to the substrate by a spin coating method to form an image recording layer having a thickness of 0.1 ⁇ m.
- the inner diameter of the image recording layer formation area (the innermost circumference of the image recording area) is as shown in Table 1 below.
- a silver reflective layer was formed with a thickness of 80 nm on the image recording layer by sputtering to produce a second disk.
- UV-cured resin dichroic clear SD640 (trade name, manufactured by Dainippon Ink & Chemicals, Inc.) was discharged as an adhesive for bonding the two disks together. After bonding the reflective layer side of the second disc to the side on which the adhesive was discharged on the first disc, press it against the second disc side to spread the UV-curing resin and rotate it at high speed. Then, the excess adhesive was shaken off by centrifugal force to form an adhesive layer having a uniform thickness from the inner periphery to the outer periphery. In order to cure the adhesive, the adhesive was cured by irradiating ultraviolet rays through the second disk. The UV lamp used at this time was a high-pressure mercury lamp, and the UV irradiation amount was 0.3 jZcm 2 .
- An optical disc was produced in the same manner as in Example 1 except that the prepit depth, the half-value width in the radial direction, the inner diameter of the image recording layer, and the like were changed as shown in Tables 1 and 2 below.
- h and h represent the average thickness of the image recording layer and the transmission spectrum and area.
- the value force obtained by measuring the pit depth of the substrate and the surface after forming the image recording layer with AFM was obtained from the psometer. Perform the measurement three times and measure the largest and smallest values respectively. And obtained as the average. The measurement was performed using an AFM apparatus SPI3800N / SPA500 (Seiko Instruments Co., Ltd.) and a probe NCH-10V (Nihon Beco Co., Ltd.).
- the prepit formation area is on the inner peripheral side of the image recording layer formation area.
- the jitter is very good, and it can be seen that good signal characteristics can be obtained.
- Jitter is the standard deviation of signal variation. If this is large, for example, a 3 ⁇ signal is detected as 4 ⁇ , resulting in a read error. If this read error is infrequent, Error correction is possible and there is no problem in reading the information loaded in the prepit, but if the frequency of errors increases, the information loaded in the prepit cannot be read accurately and disc recognition fails. Problems occur.
- the present invention provides an optical disc provided with a predetermined image drawing prohibited area on the inner periphery side of an image recording layer, an image drawing method on the optical disc, and an optical disc recording apparatus.
- the present invention also implements a signal processing method capable of obtaining prepit information by decoding the prepit signal and the signal processing method even when the polarity of the prepit signal of the optical disc is opposite to the polarity of the standard.
- a signal processing apparatus is provided.
- the present invention also provides an image drawing method capable of performing image drawing on an image recording layer of an optical disc having an image recording layer capable of drawing a visible image by laser light irradiation, and the image drawing method.
- An optical disc recording apparatus and an optical disc to which can be applied are provided.
- the present invention also provides an optical disc that can easily detect a signal related to drawing, a stamper for efficiently producing the optical disc, a method for producing the optical disc, and a pre-pit by decoding a pre-pit signal for the optical disc.
- a signal processing method capable of obtaining information and a signal processing apparatus for executing the signal processing method are provided.
- the present invention relates to an image drawing method capable of performing image drawing on an image recording layer of an optical disc having an image recording layer capable of drawing a visible image by laser light irradiation, and the image drawing method.
- the present invention provides an optical disk recording apparatus and an optical recording medium that can be applied.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP06797161A EP1930893B1 (en) | 2005-08-31 | 2006-08-31 | Optical disc and method for manufacturing such optical disc |
US11/990,931 US20090129231A1 (en) | 2005-08-31 | 2006-08-31 | Method of manufacturing optical disc, stamper, signal processing method, signal processing apparatus, image drawing method ,Optical disc recording apparatus, and optical recording medium |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
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JP2005-252426 | 2005-08-31 | ||
JP2005252426 | 2005-08-31 | ||
JP2005284692 | 2005-09-29 | ||
JP2005-284693 | 2005-09-29 | ||
JP2005284693A JP2007095195A (ja) | 2005-09-29 | 2005-09-29 | 光ディスク、画像描画方法、及び光ディスク記録装置 |
JP2005-284692 | 2005-09-29 | ||
JP2006230545A JP4637800B2 (ja) | 2005-08-31 | 2006-08-28 | 光ディスク及びその製造方法、スタンパー、信号処理方法、信号処理装置、画像描画方法、並びに光ディスク記録装置 |
JP2006-230545 | 2006-08-28 | ||
JP2006-232021 | 2006-08-29 | ||
JP2006232021A JP2007122848A (ja) | 2005-09-29 | 2006-08-29 | 信号処理方法、信号処理装置、画像描画方法、光ディスク記録装置、及び光ディスク |
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WO2007026813A1 true WO2007026813A1 (ja) | 2007-03-08 |
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PCT/JP2006/317201 WO2007026813A1 (ja) | 2005-08-31 | 2006-08-31 | 光ディスク及びその製造方法、スタンパー、信号処理方法、信号処理装置、画像描画方法、光ディスク記録装置、並びに、光記録媒体 |
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US (1) | US20090129231A1 (ja) |
EP (1) | EP1930893B1 (ja) |
KR (1) | KR20080041273A (ja) |
TW (1) | TWI430268B (ja) |
WO (1) | WO2007026813A1 (ja) |
Cited By (3)
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WO2008131277A1 (en) * | 2007-04-22 | 2008-10-30 | Hewlett-Packard Development Company, L.P. | Encoder spokes detection prior to forming image on optically writable label surface of optical disc |
WO2009067122A1 (en) * | 2007-11-24 | 2009-05-28 | Hewlett-Packard Development Company, L.P. | Virtual spoke signals for controlling optical disc |
US8111605B2 (en) | 2005-09-30 | 2012-02-07 | Fujifilm Corporation | Apparatus and method for forming image data on an optical disk |
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JP4454559B2 (ja) | 2005-09-30 | 2010-04-21 | ヤマハ株式会社 | 光ディスク画像形成装置 |
TWI376687B (en) * | 2005-09-30 | 2012-11-11 | Fuji Photo Film Co Ltd | Optical disc and method for image forming thereon |
JP2008179067A (ja) * | 2007-01-25 | 2008-08-07 | Fujifilm Corp | 光記録媒体および可視情報記録方法 |
JP2008179068A (ja) * | 2007-01-25 | 2008-08-07 | Fujifilm Corp | 光記録媒体および可視情報記録方法 |
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- 2006-08-31 WO PCT/JP2006/317201 patent/WO2007026813A1/ja active Application Filing
- 2006-08-31 KR KR1020087007146A patent/KR20080041273A/ko not_active Application Discontinuation
- 2006-08-31 EP EP06797161A patent/EP1930893B1/en active Active
- 2006-08-31 TW TW095132137A patent/TWI430268B/zh active
- 2006-08-31 US US11/990,931 patent/US20090129231A1/en not_active Abandoned
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JP2005149645A (ja) * | 2003-11-18 | 2005-06-09 | Fuji Photo Film Co Ltd | 光情報記録媒体、光情報記録媒体群及びその管理方法、並びに情報記録方法 |
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US8111605B2 (en) | 2005-09-30 | 2012-02-07 | Fujifilm Corporation | Apparatus and method for forming image data on an optical disk |
WO2008131277A1 (en) * | 2007-04-22 | 2008-10-30 | Hewlett-Packard Development Company, L.P. | Encoder spokes detection prior to forming image on optically writable label surface of optical disc |
US7724627B2 (en) | 2007-04-22 | 2010-05-25 | Hewlett-Packard Development Company, L.P. | Encoder spokes detection prior to forming image on optically writable label surface of optical disc |
WO2009067122A1 (en) * | 2007-11-24 | 2009-05-28 | Hewlett-Packard Development Company, L.P. | Virtual spoke signals for controlling optical disc |
Also Published As
Publication number | Publication date |
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EP1930893A4 (en) | 2009-07-29 |
TWI430268B (zh) | 2014-03-11 |
EP1930893A1 (en) | 2008-06-11 |
KR20080041273A (ko) | 2008-05-09 |
TW200715279A (en) | 2007-04-16 |
EP1930893B1 (en) | 2011-11-02 |
US20090129231A1 (en) | 2009-05-21 |
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