WO2005064603A1 - 光ディスク装置及び光ディスク - Google Patents
光ディスク装置及び光ディスク Download PDFInfo
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- WO2005064603A1 WO2005064603A1 PCT/JP2004/018578 JP2004018578W WO2005064603A1 WO 2005064603 A1 WO2005064603 A1 WO 2005064603A1 JP 2004018578 W JP2004018578 W JP 2004018578W WO 2005064603 A1 WO2005064603 A1 WO 2005064603A1
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- Prior art keywords
- light
- recording layer
- aberration
- tilt
- light beam
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Classifications
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- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
- G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
- G11B7/13927—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means during transducing, e.g. to correct for variation of the spherical aberration due to disc tilt or irregularities in the cover layer thickness
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- 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
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/095—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble
- G11B7/0956—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
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- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
- G11B7/131—Arrangement of detectors in a multiple array
-
- 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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
Definitions
- the present invention relates to an optical information recording medium such as an optical disk, an optical disk device that records or reproduces information on or from an optical information recording medium, and an optical disk.
- the tilt means the inclination between the optical axis of the laser beam and the normal to the optical disk substrate surface.
- the numerical aperture of the objective lens is increased and the laser wavelength is shortened, the influence of the aberration due to the tilt of the optical disk increases.
- the substantial thickness of the disk base material increases, and the influence of aberration due to tilt increases. Since these differences blur the focused spot and reduce the reliability of recording and reproduction, it is extremely important to accurately detect the tilt of the optical disc in large-capacity recording.
- a tangential push-pull signal is generated by differentially amplifying a signal of a detector divided into two in the tangential direction and generating the tangential push-pull signal. To detect the edges before and after the mark on the recording layer.
- tilt detection in the tangential direction is performed based on the symmetry of the peak value of the tangential push-pull signal at the front and rear edges (see, for example, Patent Document 1).
- a radial push-pull signal is generated in the same manner even in the radial direction, and tilt detection in the radial direction is performed based on the symmetry of the radial push-pull signals at the front and rear edges.
- a reproduced signal is input to a differentiating circuit, and the output of the differentiating circuit is compared with a predetermined level by a comparing circuit.
- the tilt in the tangential direction is detected by measuring the pulse width (see, for example, Patent Document 2). That is, in the second example, as in the first example of the conventional tilt detection described above, the leading and trailing edges of the mark on the recording layer are detected, and the tilt is detected based on the symmetry. .
- an offset voltage is added to the focus control by adding an offset voltage to the defocus detection signal when the objective lens is in focus.
- a focus state is created, and a tilt is detected by using a tracking error signal detected at that time as a tilt signal in the radial direction (for example, see Patent Document 3).
- Patent Document 1 Japanese Patent Application Laid-Open No. 11-232677
- Patent Document 2 JP 2003-77158 A
- Patent Document 3 Japanese Patent Application Laid-Open No. 2003-16680
- the present invention has been made to solve the above problem, and is applicable to a multilayer optical disk, and provides an optical disk device and an optical disk that can realize high-precision tilt detection. It is intended to do so.
- an optical disc device includes a transparent flat disc base material, a recording layer provided on the disc base material, and a predetermined positional relationship with the recording layer.
- a light source that irradiates a light beam to the recording layer through the disk base material to form an optical spot on the recording layer, and a light reflected by the reflection layer.
- a light detector for receiving light; and a tilt detecting means for detecting a tilt of the optical disk by using an output of the light detector.
- the reflective layer parallel to the recording layer on which the light beam is focused is provided, and the tilt of the indirectly focused recording layer is detected by the light reflected by the reflective layer. . Since the light reflected by the reflection layer is defocused, tilt aberration and coma are not canceled. By providing the reflection layer on the optical path in this way, it is possible to prevent a decrease in the tilt aberration detection sensitivity due to the cancellation of the aberration of the laser light between the forward light and the backward light, and to perform highly accurate tilt detection. .
- FIG. 1 is a diagram for explaining the principle of tilt detection in the first embodiment.
- FIG. 2 is a diagram showing a cross section of the optical disc in Embodiment 1 of the present invention.
- FIG. 3 is a diagram showing a configuration of an optical disk device according to Embodiment 1 of the present invention.
- FIG. 4 is a diagram for explaining the principle of tilt detection in Embodiment 2 of the present invention.
- FIG. 5 is a diagram for explaining a configuration of a recording layer of an optical disc according to Embodiment 2 of the present invention.
- FIG. 6 is a diagram for explaining a configuration of a recording layer of an optical disc according to Embodiment 2 of the present invention.
- FIG. 7 is a diagram showing a cross section of an optical disc according to Embodiment 2 of the present invention.
- FIG. 8 is a diagram showing a configuration of an optical disk device according to Embodiment 2 of the present invention.
- FIG. 9 is a diagram showing a cross section of an optical disc according to Embodiment 3 of the present invention.
- FIG. 10 is a diagram showing a configuration of an optical disc device according to Embodiment 3 of the present invention.
- FIG. 11 is a diagram showing a configuration of an optical disk device according to Embodiment 4 of the present invention.
- FIG. 12 is a diagram for explaining a principle of tilt detection according to a fifth embodiment of the present invention.
- FIG. 13 is a diagram showing a configuration of an optical disk device according to Embodiment 5 of the present invention.
- FIG. 14 is a diagram for explaining the principle of tilt detection in Embodiment 6 of the present invention.
- FIG. 15 is a diagram showing a configuration of an optical disc device according to Embodiment 6 of the present invention.
- FIG. 1 is a diagram for explaining the principle of tilt detection according to the first embodiment.
- FIG. 1 (a) shows the laser beam without tilt
- FIG. 3 is a diagram illustrating an optical path of a light beam.
- a laser beam incident on the substrate 12 from the optical disk surface 17 is reflected by the recording layer 13. That is, the optical path 15 of the laser light incident from A passes through B, C, D, and E.
- this optical disk is tilted as it is, it becomes as shown in Fig. 1 (b).
- FIG. 1 (b) shows the laser beam without tilt
- the normal 11 of the recording layer 13 is inclined by a predetermined angle 16 with respect to the optical axis 10 of the laser beam, and this angle 16 is the tilt angle.
- the optical path 15 shown in Fig. 1 (b) enters from A and passes through B ',, D', and E ', and the optical path length is the same as when there is no tilt, and tilt detection can be performed with reflected light. What? Therefore, as shown in FIG. 1 (c), a reflective layer 14 is provided in parallel with the recording layer 13, and the transmittance of the recording layer 13 is adjusted to produce light that transmits through the recording layer 13. Perform tilt detection.
- FIG. 1 (c) a reflective layer 14 is provided in parallel with the recording layer 13, and the transmittance of the recording layer 13 is adjusted to produce light that transmits through the recording layer 13. Perform tilt detection.
- the optical paths A, B, C, D, and E have the same optical path length as the optical paths A, B, C, D, and E in FIG. 1A, as in FIG. 1B. It is.
- the other optical paths A, ⁇ ', C', C ", D", E,, are clearly the optical paths of FIG. 1 (b), that is, the optical paths of A, B ', C', D ', E'. Different from long. Therefore, the tilt aberration and the coma aberration can be detected by the reflected light without the aberration being canceled by the increase / decrease of the left and right optical path lengths.
- FIG. 2 is a diagram showing a cross section of the multilayer optical disc of the first embodiment.
- This optical disc includes an upper substrate 51, a recording layer stack 52, a reflective layer 53, and a lower substrate 54.
- the recording layer stack means a portion where the recording layer 55 is stacked via the intermediate layer 56.
- each recording layer 55 in the recording layer stack 52 is configured to be parallel to the reflection layer 53.
- These parallel layers are formed, for example, by forming an intermediate layer 56 on the reflective layer 53 by spin coating or sputtering, and then laminating the recording layer 55 and the intermediate layer 56 thereon by spin coating and sputtering. You. Thereby, the recording layer 55 and the reflection layer 53 can be formed in parallel.
- the interval between the recording layers 55 that is, the thickness of the intermediate layer 56 is, for example, 10 zm.
- This thickness is determined by the number of data recorded in a circle 5B where the laser beam 57 crosses the adjacent recording layer 5A adjacent to the light-collecting recording layer 59 on which the laser beam 57 is condensed. This is because a change in the number of “1” and “0” in the recording code of the data recorded in the circle 5B causes crosstalk noise, so if the number of data recorded in the circle 5B is large, This variation is averaged, so that the predetermined allowable crosstalk noise force determines the number of data recorded in the circle 5B, and the number of data recorded in the circle 5B is determined by the distance between the adjacent recording layers 55. That is, the thickness of the intermediate layer 56 is determined.
- the intermediate layer 56 between the recording layer stack 52 and the reflective layer 53 may be 10 / im or less, for example, about 3 / im because there is no data recorded in the reflective layer 53.
- a reflection layer used as a recording layer of a conventional optical disk has a light reflection layer for irradiating the recording layer with laser light a plurality of times, and a heat generated in the recording layer is quickly dissipated. It serves as a thermal diffusion layer for the purpose. Therefore, the recording layer and the reflective layer are provided as close as possible so that the light reflected by the reflective layer is efficiently radiated to the recording layer or the heat generated in the recording layer is efficiently dissipated.
- the distance between the recording layer and the reflective layer is about 20 nm to 200 nm (IEICE Technical Report IEICE).
- the reflective layer 53 of the present invention is provided to reflect the laser beam that is focused on the recording layer 55 and is defocused on the reflective layer 53. That is, if a certain amount of deforming force is not applied, tilt aberration and coma included in the reflected light are canceled on the return path, and the sensitivity of tilt detection is reduced.
- the distance between the recording layer 53 and the reflective layer 55 (the thickness of the intermediate layer 56 formed between the recording layer 53 and the reflective layer 55) in the present invention must be sufficiently longer than the wavelength of the laser beam. No.
- the distance between the recording layer 53 and the reflective layer 55 needs to be about 5 times or more the wavelength of the laser beam, that is, about 3000 nm (3 / im) or more. .
- the distance force between the recording layer and the reflective layer is two digits from S1 digit, and the present invention is better. It is bigger and has a different structure.
- the recording layer 55 is made of a photochromic material such as jaryletene or fulgide.
- a photochromic material such as jaryletene or fulgide.
- a UV curable resin or ZnS_SiO is used for the intermediate layer 56.
- reflection layer 53 for example, a silicon-based thin film or a thin-film metal layer of aluminum or the like is used.
- the recording layer 55 is irradiated with the laser beam, so that a two-photon absorption phenomenon occurs.
- a photoisomerizable material is one of the nonlinear optical effects, and refers to a phenomenon in which a molecule of a material absorbs two photons at the same time and the refractive index changes.
- the refractive index of only the photoisomerizable material at the focal point of the laser beam can be changed.
- the focal point of the laser beam can be controlled in the depth direction.
- the recording layer for recording can be selected.
- the photoisomerizable material for example, diarylethene is used.
- FIG. 3 is a diagram showing a configuration of the optical disc device according to Embodiment 1 of the present invention.
- the optical disk 66 is the multilayer optical disk shown in FIG.
- the laser (light source) 61 is driven by a laser drive circuit 60 and outputs laser light of a predetermined power.
- the laser light output by the laser 61 is converted by the collimating lens 62 into parallel light.
- the spherical aberration of the laser light converted into parallel light is corrected by the deformable mirror 6Q.
- the spherical aberration correction by the deformable mirror 6Q is performed so that the amount of spherical aberration contained in the reflected light from the recording layer 59 where the laser beam 57 in the recording layer stack 52 is focused in Fig. 2 is minimized. The amount is determined.
- the amount of spherical aberration contained in the reflected light from the recording layer 59 is detected by the even symmetric aberration sensor 6S.
- the even symmetric aberration sensor 6S is a sensor that outputs an even-order aberration mode in the Zemike mode, for example, the amount of aberration of defocus aberration and spherical aberration.
- the spherical aberration output of the even symmetric aberration sensor 6S is input to the servo controller 6U.
- the servo controller 6U drives the deformable mirror 6Q through the deformable mirror drive circuit 6R based on the amount of spherical aberration detected by the even symmetric aberration sensor 6S.
- the laser light reflected by the deformable mirror 6Q passes through the polarizing beam splitter 63, passes through the 1Z4 wavelength plate 6T, and enters the objective lens 64.
- the servo controller 6U controls the objective lens actuator 65 based on the amount of defocus aberration from the even symmetric aberration sensor 6S so that the objective lens 64 is focused on a predetermined recording layer in the recording layer stack 67. ing.
- a part of the laser beam that has reached a predetermined recording layer in the recording layer stack 67 passes through the recording layer stack 67 and reaches the reflection layer 68. Other portions of the laser beam that has reached the predetermined recording layer in the recording layer stack 67 are reflected by the predetermined recording layer in the recording layer stack 67.
- the reflection layer 68 is formed so as to be parallel to the recording layer in the recording layer stack 67.
- the laser light that has reached the reflection layer 68 is reflected by the reflection layer 68 and returns to the objective lens 64.
- the laser light returned to the objective lens 64 passes through the objective lens 64 and the quarter-wave plate 6T, is reflected by the polarization beam splitter 63 in a direction different from that of the outward light, and enters the half mirror 6V.
- the incident laser beam is split into two laser beams.
- One of the laser beams split by the half mirror 6V enters the tilt sensor 6P shown in a range surrounded by a dotted line in FIG.
- the other laser beam split by the half mirror 6 V enters the even-symmetric aberration sensor 6S shown in a range surrounded by a dotted line in FIG. .
- the tilt sensor 6P is an improvement of a conventionally known modal type wavefront sensor.
- a modanol-type wavefront sensor is a wavefront sensor that outputs a wavefront as each coefficient of orthogonal aberration mode such as Zernike mode.
- the feature is that the aberration amount in a preset aberration mode can be detected regardless of the aberration amounts in other aberration modes.
- the modal wavefront sensor can detect, for example, the amount of coma, which is one aberration mode, independently of another aberration mode, for example, spherical aberration. Therefore, it is possible to detect the tilt of the optical disk by detecting the tilt aberration or the coma with the modal wavefront sensor.
- a modal wavefront sensor serving as a prototype of the present embodiment is described in the following document. Mark A. ⁇ , ⁇ ony Wilson, et al., Ew moaalwave—front sensor: a theoretical analysis,
- the difference in the configuration between the modal wavefront sensor of the above document and the tilt sensor 6P of the present embodiment is that a mechanism for canceling the defocus aberration and the spherical aberration of the laser beam incident on the tilt sensor 6P is added. It is in the point which did.
- the mechanism for canceling the defocus aberration is realized by providing the focusing lens 6D movably.
- the mechanism for canceling spherical aberration is realized by providing the deformable mirror 6A.
- the laser light that has entered the tilt sensor 6P enters the deformable mirror 6A.
- the formable mirror 6A changes the mirror shape according to the input spherical aberration control signal 6M. As described above, the spherical aberration is canceled by the deformable mirror 6A.
- the laser light reflected by the deformable mirror 6A enters the hologram 6C.
- two types of bias X-coma with the same size but different signs two types of bias Y-coma with the same size but different signs
- two types of bias defocus aberration with the same size but different signs Eight kinds of bias aberrations, two kinds of bias spherical aberrations having the same magnitude and different signs are controlled.
- the amount of aberration of each bias aberration is determined by the amount of aberration to be detected, and is preferably about half of the amount of aberration to be detected.
- the laser beam to which the bias aberration has been added by the hologram 6C enters the condenser lens 6D.
- the condenser lens 6D is held by a condenser lens actuator 6E.
- the condenser lens actuator 6E moves the focus position of the condenser lens 6D according to the defocus aberration control signal 6L. As described above, moving this condenser lens cancels the defocus aberration.
- the laser light incident on the condenser lens 6D is focused on the pinhole group 6F.
- Eight pinholes corresponding to the added bias aberration are provided on the pinhole group 6F.
- the radius of each pinhole is, for example, 1 / 1.22 times the diameter of the Airy disk.
- the laser beam that has passed through the pinhole group 6F enters the photosensor corresponding to each pinhole on the photosensor group 6G.
- the light incident on the photo sensor is converted into an electric signal and input to the aberration mode detection circuit 6H.
- the signal of each photosensor is differentially amplified for each aberration mode in the aberration mode detection circuit 6H.
- the aberration mode detection circuit 6H outputs an XY tilt detection signal 6N (X-Y coma aberration detection signal), a defocus aberration signal 6J, and a spherical aberration signal 6K.
- the X—Y tilt detection signal 6N (X—Y coma aberration detection signal) is the output of the chinoleto sensor.
- the defocus aberration signal 6J, the spherical aberration signal 6K, and the X- ⁇ tilt detection signal 6 ⁇ are input to the defocus aberration / spherical aberration cancel controller 61.
- Defocus aberration 'The spherical aberration canceling controller 61 controls the defocus of the laser beam Based on the defocus aberration signal 6J and the spherical aberration signal 6K, the defocus aberration control signal 6L and the spherical aberration control are canceled so as to cancel one-casing aberration and cancel the spherical aberration of the laser beam incident on the deformable mirror 6A.
- a signal 6M is generated, and the generated defocus aberration control signal 6L and spherical aberration control signal 6M are output.
- the defocus aberration signal 6J, the spherical aberration signal 6K, and the X-tilt detection signal 6 are output to the servo controller 6U.
- the servo controller 6U and the defocus aberration / spherical aberration canceling controller 61 are connected by a bidirectional communication line.
- the tilt sensor 6 # configured as described above has the following features as compared with the modal type wavefront sensor disclosed in the above document.
- the laser beam reflected from the reflective layer 68 remains without canceling the coma aberration, and the tilt can be detected in principle using this.
- it also includes large defocus aberration and spherical aberration at the same time.For this reason, when the modal wavefront sensor described in the above document was used, it was formed by the condenser lens 6D. There is a problem that the beam spot is blurred and the detection output is reduced.
- the tilt sensor 6 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ cancels out the defocus aberration and the spherical aberration of the laser beam incident on the tilt sensor 6 ⁇ ⁇ , and then enters the condenser lens 6 D.
- a clear beam spot with a high ratio can be obtained, and the X- ⁇ tilt detection signal 6 ⁇ with a high SN ratio and a high detection output can be obtained.
- the laser light reflected on a predetermined recording layer in the recording layer stack 67 returns to the objective lens 64.
- the laser beam having the recording layer power returned to the objective lens 64 passes through the objective lens 64 and the quarter-wave plate 6 ⁇ , is reflected by the polarization beam splitter 63 in a direction different from the outward light, and is incident on the half mirror 6V.
- the incident laser beam is
- One of the laser beams enters the tilt sensor 6P shown in a range surrounded by a dotted line in FIG.
- the other laser beam is incident inside the even-symmetric aberration sensor 6S shown in a range surrounded by a dotted line in FIG.
- the even symmetric aberration sensor 6S detects the defocus aberration and the spherical aberration of the laser light condensed and reflected by a predetermined recording layer in the recording layer stack 67. Therefore, the even symmetric aberration sensor 6 Unlike the laser beam detected by the tilt sensor 6P, the laser beam detected by the S does not include large defocus aberration and spherical aberration. Therefore, it is not necessary to cancel the defocus or spherical aberration of the laser light to be detected. Therefore, the even symmetric aberration sensor 6S is the same sensor as the modal wavefront sensor of the above-mentioned document.
- the laser beam incident on the even symmetric aberration sensor 6S is incident on the hologram 6W.
- four types of bias aberrations are added: two types of bias defocus aberrations of the same magnitude but different signs, and two types of bias spherical aberrations of the same magnitude but different signs.
- the amount of aberration of each bias aberration is determined by the amount of aberration to be detected, and is preferably about half of the amount of aberration to be detected.
- the laser light to which the bias aberration has been added by the hologram 6W enters the condenser lens 6X.
- the condenser lens 6X is adjusted so as to collect the laser beam from the focal point of the objective lens 64.
- the laser light incident on the condenser lens 6X is condensed on the pinhole group 6Y.
- Four pinholes corresponding to the added bias aberration are provided on the pinhole group 6Y.
- the radius of each pinhole is, for example, 1 / 1.22 times the diameter of the Airy disk.
- the laser beam that has passed through the pinhole group 6Y enters the photosensor corresponding to each pinhole on the photosensor group 6Z.
- the photo sensor converts incident light into an electric signal.
- the electric signal converted by the photo sensor is output to the aberration mode detection circuit 610.
- the signal output by each photosensor is differentially amplified in the aberration mode detection circuit 610 for each of the difference modes.
- the aberration mode detection circuit 610 outputs a defocus aberration signal and a spherical aberration signal to the servo controller 6U.
- a reproduction signal of the recorded data can be obtained by adding signals of the same type of aberration having different signs from signals from the photosensor group in the tilt sensor 6P and the even symmetric aberration sensor 6S. For example, if the signal from the detector corresponding to the positive bias addition due to the defocus aberration in the even symmetric aberration sensor 6S and the signal from the detector corresponding to the negative bias addition due to the defocus aberration are added, the reproduction signal is obtained. can get.
- signals from multiple sets of detectors are added only by adding the signals from one set of detectors. By adding the signals, a reproduced signal with a higher SN ratio can be obtained.
- the servo controller 6U operates the objective lens actuator 65 so that the laser light is focused on a predetermined recording layer in the recording layer stack 67, and controls the objective lens 64.
- An example of a control procedure from the initial state to the output of the tilt detection signal is shown below.
- the objective lens actuator 65 once moves the objective lens 64 to an approximate position so that the laser light is focused on the surface of the optical disc 66.
- the defocus aberration 'spherical aberration canceling controller 61 drives the condenser lens actuator 6E, and uses the light reflected by the surface of the optical disk 66 to generate an "S-shaped curve" with the defocus aberration signal 6J. Adjust the position of the condenser lens 6D of the tilt sensor 6P so that "can be detected. At the same time, the servo controller 6U detects the "S-shaped curve” based on the defocus aberration output from the even symmetric aberration sensor 6S, and controls the objective lens 64 to focus on the surface of the optical disk 66. At this time, the spherical aberration correction corresponding to the surface of the optical disk 66 is performed on the deformable mirror 6A and the deformable mirror 6Q so that the spherical aberration correction amount is the same.
- the servo controller 6U moves the focusing position of the laser beam downward from the surface of the optical disk 66 by moving the objective lens 64. Then, the servo controller 6U sequentially controls the deformable mirror 6A, the deformable mirror 6Q, and the condenser lens 6D of the tilt sensor 6P so that the "S-curve" of the next recording surface can be detected, and The “S-shaped curve” of a predetermined recording layer in the recording layer stack 67 is detected while counting the number of detected “S-shaped curves”.
- the servo controller 6U When the “S-shaped curve” of the predetermined recording layer in the recording layer stack 67 is detected, the servo controller 6U operates such that the laser beam is focused on the predetermined recording layer in the recording layer stack 67.
- the objective lens 64 and the deformable mirror 6Q are controlled in such a way that the objective lens 64 and the deformable mirror 6Q are controlled to cancel the deformed force aberration output and the spherical aberration output of the even symmetric aberration sensor 6S.
- the defocus / spherical aberration cancel controller 61 advances the condenser lens 6D of the tilt sensor 6P in the same direction as (3).
- the defocus aberration 'spherical aberration canceling controller 61 controls the deformable mirror 6A so as to cancel the spherical aberration signal 6K detected by the aberration mode detection circuit 6H. By these operations, the "S-shaped curve of the reflective layer 68" is detected while sequentially counting the number of detected "S-shaped curves of the recording layer”.
- the defocus / spherical aberration canceling controller 61 condenses the “S-curve of the reflective layer 68” of the defocus aberration signal 6J. Using the point as a control target, the deformable mirror 6A and the condenser lens 6D are controlled. At this time, the XY tilt detection signal 6N output from the aberration mode detection circuit 6H detects the tilt of the recording layer in the recording layer stack 67.
- the servo controller 6U detects the "S-curve" of the predetermined recording layer in the recording layer stack 67 based on the defocus aberration output of the even symmetric aberration sensor 6S, and outputs the spherical aberration of the even symmetric aberration sensor 6S.
- the objective lens 64 and the deformable mirror 6Q With the objective lens 64 and the deformable mirror 6Q, the “S-curve” of the predetermined recording layer in the recording layer stack 67 is detected and the laser beam is focused on the predetermined recording layer in the recording layer stack 67. Control. At the same time, the defocusing aberration.
- the spherical aberration canceling controller 61 controls the focusing point of the "S-shaped curve of the reflective layer 68" of the defocusing aberration signal 6J and controls the deformable mirror 6A and the focusing lens 6D. I do.
- the servo controller 6U controls the tilt of the recording layer in the recording layer stack 67 with the objective lens actuator 65 based on the XY tilt detection signal 6N at that time.
- the detection signals of both the tilt sensor 6P and the even symmetric aberration sensor 6S are used.
- the tilt sensor 6P is used in place of the even symmetric aberration sensor 6S in a time division manner, The initial operation of the tilt detection is possible only by the above operation.
- the tilt of the condensing recording layer in the recording layer stack 67 is detected by detecting the tilt aberration or the coma of the reflected light from the reflection layer 68.
- tilt detection may be performed by detecting tilt aberration or coma of reflected light from a recording layer other than the focused recording layer.
- the servo controller 6U can eliminate the lens shift by controlling the objective lens actuator 65 so that the sign of the tilt error and the sign of the coma aberration become the same.
- the Hartmann sensor can calculate the amount of aberration for each aberration mode by expanding the detected wavefront shape using orthogonal Zernike polynomials, which is the force obtained as the detected value of the wavefront shape (Carios Robledo—Sanchez, Applied
- the optical disk device of the present embodiment since tilt detection is performed by the reflected light from the reflective layer parallel to the recording layer, a structure such as a groove for diffracting light is not required in the recording layer. Even if it is flat, high-precision tilt detection becomes possible.
- Patent Document 1 JP-A-11-232677
- tilt detection is performed using reflected light from a defocused beam spot, as in the present invention.
- Patent Document 1 while applying an offset voltage to a focus signal, the beam light on the recording layer is defocused, and tilt detection is performed using the reflected light.
- the reflection layer 53 is provided at a position separated by a predetermined distance from the recording layer 55, the beam light is focused on the recording layer 55, and the defocused beam light on the reflection layer 53 is adjusted. Tilt detection is performed by detecting reflected light. Therefore, in the present invention, since the light beam is focused on the recording layer 55, tilt detection and recording or reproduction can be performed simultaneously.
- the tilt detection method of the present invention since the recording layer is always in focus, tracking is stable, and tilt detection can be performed for a long period.
- the tilt detection is possible in real time, and furthermore, the method of Patent Document 1 which can simultaneously perform the detection of the chinoleto and the recording or the reproduction is not possible.
- Gaining power S can.
- FIG. 4 is a diagram for explaining the principle of tilt detection according to Embodiment 2 of the present invention.
- FIG. 4 shows an example in which the number of recording layers is one for simplicity. The same applies to a case where a plurality of recording layers are stacked.
- FIG. 4A is a diagram showing an optical path of a beam light focused on the flat recording layer 23 when the optical disc has a tilt.
- the normal 22 of the recording layer 23 is inclined by a predetermined angle 26 with respect to the optical axis 21 of the laser beam, and this angle 26 is the tilt angle.
- the laser light that has entered the substrate 29 from the optical disk surface 27 is reflected by the recording layer 23.
- the optical path 25 enters from A, passes through B ', C', D ', and E', and has the same optical path length as when there is no tilt, and the tilt is detected by the reflected light from the recording layer 23. Can not. Therefore, as shown in FIG. 4 (b), a part (scattering part 24) that scatters the incident light is provided in a part of the recording layer 23, and tilt detection is performed by the light scattered by the scattering part 24.
- the laser light incident from A passes through B 'and condenses on C'.
- the light scattered by the scattering unit 24 absorbs the energy of the incident light having the wavelength ⁇ 0 and emits the light having the same wavelength ⁇ 0 as the incident light at a wide angle around the normal 22 of the recording layer 23 as the center of symmetry. Therefore, scattering Since the light has little or no correlation with the phase of the laser light incident through the forward light, that is, A, B'C ', the scattered light has tilt aberration and coma aberration, and the scattered light tilts. It is possible to detect the tilt of the optical disk based on the aberration and the coma aberration.
- FIG. 4 (c) shows an example in which a layer (scattering layer 28) that separates the recording layer 23 from the recording layer 23 and scatters incident light is provided (in this case, It is provided in parallel relation with the recording layer 23).
- the tilt detection of the recording layer 23 is performed indirectly by performing the tilt detection using the light scattered by the scattering layer 28.
- the laser light incident from A passes through B 'and is focused on C'. Since C is on the scattering layer, it absorbs the energy of the incident light of wavelength ⁇ 0 and emits light of the same wavelength ⁇ 0 as the incident light at a wide angle with the normal 22 of the recording layer 23 as the center of symmetry. Therefore, in FIG. 4 (c), similarly to FIG.
- the scattered light has a small correlation with the phase of the outward light, ie, the laser light incident through A, B'C '. Or no correlation, the tilt of the scattering layer 28 can be detected by the tilt aberration and the coma of the scattered light, and the tilt of the recording layer 23 can be detected indirectly from the tilt of the scattering layer 28. It is.
- An example in which the scattering layer 28 is provided will be described in more detail in Embodiment 3.
- FIG. 5 is a diagram for explaining the configuration of the recording layer of the optical disc according to Embodiment 2 of the present invention.
- a scattering section 72 is provided in a part of the recording layer 71 in the optical disc.
- the scattering unit 72 randomizes at least part of the phase of the incident laser light.
- (a) is a diagram showing one example. It is preferable that the depth of the concave portion or the height of the convex portion of the irregular reflection portion (scattering portion 82) is equal to or more than a half wavelength ( ⁇ 0/2) of the wavelength of the laser beam ⁇ 0.
- the concave portion or the convex portion is formed by locally providing the surface of the stamper only with the scattering portion 82 and transferring the shape.
- the laser light having a wavelength of 10 becomes scattered light having a wavelength ⁇ by the scattering surface 83 of the scattering portion 82 formed on the recording layer 81 with irregularities.
- the scattering portion 82 may form only a concave portion that is at least half the wavelength of the laser light on the surface of the recording layer 81, It is also possible to form only the protrusions of more than one minute.
- [0076] 2 In a medium having transparency to laser light, at least half a wavelength of laser light or more. Of the scattering material over a depth of.
- Figure 5 shows this example.
- the medium 74 is transparent or translucent with respect to the wavelength of the incident laser light.
- the scattering substance 73 has a refractive index different from that of the medium 74, and reflects a part of the incident laser light at the interface.
- the scattering material 73 is substantially continuously dispersed in the medium 74 over a depth of at least a half wavelength or more.
- the phase of the incident laser light is randomized by being reflected by the scattering material 73 at various depths.
- the scattering substance 73 may be small at the molecular level, but preferably has a somewhat large diameter in order to increase the reflection efficiency.
- the wavelength of the incident laser beam is set to ⁇
- the average diameter D of the scattering material is set so as to satisfy the condition of ⁇ / 10 ⁇ D ⁇ / 2.
- the shape of the scattering section 72 shown in Fig. 5 may be an uneven shape like the scattering section 82 shown in Fig. 6 (a). That is, a scattering material is dispersed in a medium having transparency to laser light over a depth of at least half a wavelength of the laser light, and the surface is formed in an uneven shape.
- the scattering substance 73 organic substances such as various dyes are dispersed.
- a high scattering material such as Intralipid (R) is used to increase the scattering property.
- inorganic substances such as various pigments and fullerenes may be dispersed.
- a high-power laser such as a YAG laser may be applied to the medium 74 to change the medium 74 to provide a portion having a changed refractive index, and this may be used as the scattering material 73.
- FIG. 6 (b) is a diagram showing an example.
- the recording layer 81 which is a medium, is focused and irradiated with high-power laser light in a short time to form a void 84, and the void 84 is used as a scattering material.
- one void 84 is formed by one laser irradiation, but a minute nucleus is dispersed in a medium in advance, and many voids are formed by one laser irradiation starting from this nucleus. You can also.
- a micro-absorber which has a higher absorptance of high-power laser light than a medium, is dispersed, and if a laser is irradiated here, only the absorber becomes a high temperature, and a void or altered medium surrounds it. Scattering material is formed. That is, it is possible to form the scattering material so that small nuclei grow larger.
- the number of scattering substances formed by one laser irradiation can be set arbitrarily. it can.
- the wavelength of the high-power laser for forming voids is different from the wavelength of the recording / reproducing laser, and the core absorber has a high transmittance at the wavelength of the recording / reproducing laser. So that In this way, even if the light absorber serving as a nucleus is dispersed throughout the optical disc, there is no adverse effect on recording / reproduction, so that the disc manufacturing process can be extremely simplified.
- the laser energy for growing the nucleus and turning it into a scattering substance can be significantly reduced.
- the light absorber serving as a nucleus is made into a microcapsule, and a reactive substance that causes a chemical change with the medium is contained in the microcapsule. And a chemical reaction between them, thereby transforming them, and this transformed part can be used as a scattering substance.
- a photosensitive material that causes a photochemical reaction with light having a wavelength different from that of the recording / reproducing light is dispersed in a medium, and this is selectively irradiated with light in the disc manufacturing process to arbitrarily irradiate the light.
- the scattering part can be formed at the location of the above.
- these photosensitive materials those having a suitable wavelength characteristic of a general photosensitive dye used for optical recording such as an optical disk and a silver halide photograph can be selected.
- FIG. 7 is a diagram showing a cross section of a multilayer optical disc according to the second embodiment using the structures of FIGS. 5 and 6.
- This optical disc includes an upper substrate 91, a recording layer stack 92, and a lower substrate 94.
- the recording layer stack 92 means a portion where a plurality of recording layers 95 are stacked via an intermediate layer 96.
- a part of the recording layer 95 in the recording layer stack 92 is composed of a scattering part 93, and emits scattered light when irradiated with the laser light 97.
- the recording material used to form the recording layer 95 is a photochromic material such as diarylethene or furgide, and the scattering material is a void having an average diameter of about 0.1 lzm.
- the intermediate layer 96 is made of UV curable resin or ZnS—Si ⁇ .
- the thickness of the scattering section 93 is provided to be the same as the thickness of the recording layer 95, and the scattering section 93 is provided at a predetermined position with respect to each recording layer 95.
- the scattering portion 93 may be provided collectively so as to cross a plurality of recording layers 95 in the thickness direction.
- the scattering layer forming beam is irradiated onto the entire recording layer stack 92 after forming the recording layer stack 92 to form the scattering sections 93 at once, it is necessary to form the scattering sections 93 for each recording layer 95. Man-hours for manufacturing discs can be greatly reduced.
- the numerical aperture NA of the beam for forming the scattering part is 0.3 or less, more preferably 0.1 or less, so that it is close to parallel light, and the top layer force is evenly close to the bottom layer. are doing.
- a short-wavelength beam such as DUV, EUV, X-ray, synchrotron radiation, and electron beam can be used in addition to the high-power laser described above. If such a short-wavelength beam is used, even if the NA is reduced, the spread of the shape of the scattering portion 93 due to diffraction can be effectively suppressed. It is possible to more easily induce a change in the refractive index due to the deterioration of the recording layer 95, and it is possible to further expand the range of material selection for the recording layer 95 and the intermediate layer 96.
- FIG. 8 is a diagram showing a configuration of an optical disc device according to Embodiment 2 of the present invention.
- the optical disk device shown in FIG. 8 is an example to which the optical disk shown in FIG. 7 is applied.
- the optical disc 103 includes a scattering section 101 in a recording layer in the recording layer stack 67. About 10 to 50 scattering units 101 are arranged in a predetermined place per one turn of the optical disk 103, and the optical disk apparatus can identify the detection timing of the scattering unit 101 based on timing information from the recording layer.
- the difference from the first embodiment lies in the configuration of tilt sensor 108.
- the tilt sensor 108 is different from the tilt sensor 6P of the first embodiment in that the condenser lens 6D is fixed and that the scattering unit 93 intermittently detects the tilt.
- the tilt sensor 108 Since the laser beam is focused on the recording layer of the optical disc 103, the tilt sensor 108 Does not include large defocus aberration and spherical aberration. Therefore, in this embodiment, even if the defocus aberration and the spherical aberration are not canceled, the light can be sufficiently collected only by the light collecting lens.
- the servo controller 109 operates the objective lens actuator 65 to control the objective lens 64 so that the laser light is focused on a predetermined recording layer in the recording layer stack 67. .
- the servo controller 109 deforms the spherical aberration detected by the even symmetric aberration sensor (not shown in FIG. 8) so that the spherical aberration corresponding to the recording layer on which the laser beam is focused is applied. Control the Bull Mirror 6Q.
- the servo controller 109 controls the objective lens actuator 65 based on a defocus detection value of an even symmetric aberration sensor (not shown in FIG. 8), and focuses a laser beam on a predetermined recording layer.
- the X-Y tilt detection signal 6N at this time is the detected tilt.
- Such scattering portions are arranged at regular intervals on tracks on the recording layer. For example, when the tracking is performed by the sample servo method, if the servo mark is made of such a scattering material, the scattering portions are arranged at regular intervals.
- the scattering portion may be formed of a material that emits light having a wavelength different from the wavelength of the laser light.
- a similar effect can be obtained by using a fluorescent substance such as diarylethene or fulgide instead of the scattering substance and performing tilt detection with fluorescence generated by the fluorescent substance.
- the wavelength of the laser light and the fluorescence incident on the fluorescent material are different, only the fluorescence can be separated and used for detection with an optical filter or the like, and the detection sensitivity can be further improved. Can be expected.
- the optical disk device of the present embodiment since the phase of the laser light applied to the scattering material is randomized and emitted as scattered light, the tilt aberration of the scattered light or the By detecting the aberration, highly accurate tilt detection can be performed.
- FIG. 9 is a diagram showing a cross section of a multilayer optical disc according to Embodiment 3 of the present invention.
- Book The optical disc includes an upper substrate 111, a recording layer stack 112, a scattering layer 113, and a lower substrate 114.
- the recording layer stack 112 means a portion where a plurality of recording layers 115 are stacked via the intermediate layer 116.
- each recording layer 115 in the recording layer stack 112 is configured to be parallel to the scattering layer 113.
- These parallel layers are formed by, for example, forming an intermediate layer 116 on the scattering layer 113 by spin coating or sputtering, and laminating the recording layer 115 and the intermediate layer 116 thereon by spin coating or sputtering. Formed.
- the recording layer 115 and the scattering layer 113 can be formed in parallel.
- a photochromic material such as jaryletene or fulgide is used.
- a UV curable resin, ZnS_SiO, or the like is used for the intermediate layer 116.
- the same material as that of the second embodiment for example, particles having a maximum diameter of at least a half wavelength or less of the wavelength of the incident light are randomly arranged at a predetermined density.
- the laser light 117 is focused on the recording layer 115, and the laser light 118 is focused on the scattering layer 113.
- the laser beam 117 is used for recording or reproduction on the recording layer, and the laser beam 118 is used for tilt detection.
- the scattering layer 113 emits scattered light. The aberration due to the tilt is detected by the scattered light.
- FIG. 10 is a diagram showing a configuration of an optical disc device according to Embodiment 3 of the present invention.
- the optical disk device shown in FIG. 10 is an example to which the optical disk shown in FIG. 9 is applied.
- the optical disk 126 is the multilayer optical disk shown in FIG.
- the optical disc 126 includes a scattering layer 125 separately from the recording layer stack 128.
- the scattering layer 125 has a positional relationship parallel to the recording layers in the recording layer stack 128.
- the even symmetric aberration sensor 6S for correcting the spherical aberration of the deformable mirror 6Q is not shown, but is provided with the same one as in the first embodiment.
- the laser drive circuit (first laser drive circuit) 60 drives a laser (first laser) 61 to oscillate laser light having a wavelength of ⁇ .
- the laser light emitted from the laser 61 is converted into a parallel light by a collimating lens (first collimating lens) 62 and is incident on the deformable mirror 6Q.
- the spherical aberration is corrected based on the detection value of the spherical aberration sensor of the laser light having the wavelength ⁇ 0 not shown in FIG. That is, the servo controller 130 adjusts to the recording layer that focuses the laser light of wavelength ⁇ .
- the deformable mirror 6Q is controlled by a spherical aberration detection value of an even symmetric aberration sensor not shown in FIG. 10 so that spherical aberration is added.
- the laser light reflected by the deformable mirror 6Q enters the polarizing beam splitter 124.
- the second laser driving circuit 121 drives the second laser 122 to oscillate laser light having the wavelength ⁇ 1.
- the wavelength ⁇ 0 and the wavelength ⁇ 1 are different wavelengths. For example, ⁇ 0 f up to 405 nm, ⁇ I f up to 650 nm, and f up to 780 nm.
- the laser light emitted from the second laser 122 is converted into substantially parallel light by the second collimating lens 123 and enters the polarization beam splitter 124.
- the two laser beams having the wavelengths ⁇ 0 and ⁇ 1 are emitted from a plane different from the plane of incidence of the polarizing beam splitter 124.
- the optical axis of the emitted laser light of wavelength ⁇ 0 and the optical axis of the laser light of ⁇ 1 are aligned.
- the numerical aperture of the laser with the wavelength of 11 is smaller than the numerical aperture of the laser with the wavelength of 10.
- the laser beam having the wavelength ⁇ 0 and the wavelength ⁇ 1 incident on the polarization beam splitter 63 passes through the polarization beam splitter 63 as it is, passes through the quarter-wave plate 6 ⁇ ⁇ ⁇ , and enters the objective lens 64.
- the objective lens 64 focuses the laser light having a wavelength of ⁇ 0 on a predetermined recording layer in the recording layer stack 128 in the optical disc 126.
- the objective lens 64 focuses the laser light having the wavelength ⁇ 1 on the scattering layer 125.
- the scattering layer 125 absorbs the energy of the laser beam of the wavelength ⁇ 1 irradiated by the second laser 122 and emits the scattered light of the first wavelength, and a part of the emitted scattered light is converted to the objective lens 64. Again, passes through the 1Z4 wavelength plate 6 °, and further enters the polarization beam splitter 63.
- the laser beam having a wavelength of 10 focused on a predetermined recording layer of the recording layer stack 128 is reflected by the predetermined recording layer of the recording layer stack 128 and is incident on the objective lens 64 again, and the 1 wavelength plate After passing through 6 °, the light further enters the polarization beam splitter 63.
- the reflected light from the recording layer of the recording layer stack 128 and the scattered light from the scattering layer 125 that have entered the polarizing beam splitter 63 are reflected by the polarizing beam splitter 63 in a direction different from the outward light. And enters the optical filter 127.
- the optical filter 127 has a wavelength of 10 Has a spectral characteristic of transmitting light of the wavelength ⁇ 1 and reflecting light of the wavelength ⁇ 1. Therefore, the reflected light from the recording layer of the optical disk 126 cannot pass through the optical filter 127 and enters the reproduced signal sensor (not shown).
- the reproduction signal sensor detects the incident reflected light and reads out information recorded on the recording layer.
- the optical filter 127 scattered light having a wavelength of ⁇ 1 from the scattering layer 125 is transmitted.
- the scattered light having the wavelength ⁇ 1 transmitted through the optical filter 127 is reflected by the reflection mirror 102 and enters the tilt sensor 129 surrounded by a dotted line.
- the tilt sensor 129 has the same configuration as the tilt sensor 108 shown in FIG. 8, and differs only in the wavelength of laser light and the numerical aperture.
- the scattered light that has entered the tilt sensor 129 enters the hologram 104.
- two types of bias X-coma aberration and bias-coma aberration having the same size but different signs are added.
- the laser light to which the bias aberration has been added by the hologram 104 enters the condenser lens 6D.
- the laser light incident on the condenser lens 6D is focused on the pinhole group 105.
- On the pinhole group 105 four pinholes corresponding to the added bias aberration are provided.
- the laser light that has passed through the pinholes enters the photosensors corresponding to each pinhole on photosensor group 106.
- the light incident on the photo sensor is converted into an electric signal and input to the aberration mode detection circuit 107.
- the signal of each photo sensor is differentially amplified for each aberration mode in the aberration mode detection circuit 107, and outputs an X- ⁇ tilt detection signal 6 (X- ⁇ frame difference detection signal).
- optical disk device of FIG. 10 The operation of the optical disk device of FIG. 10 is the same as that of FIG. 8, and a description thereof will be omitted.
- a laser beam spherical aberration sensor a laser beam defocus sensor, and a reproduction signal sensor for a laser beam having a wavelength ⁇ , which are not shown in FIG. And operates with the laser light.
- a similar effect can be obtained by using a diffusely reflecting surface or a fluorescent layer instead of the scattering layer 125.
- the phase of the laser light applied to the scattering layer is randomized and becomes scattered light, and has only aberration of return light.
- the tilt of the scattering layer can be detected, and the tilt of the recording layer can be indirectly detected.
- the scattering layer 125 is provided in a different layer other than the recording layer stack 128, the manufacture of the optical disc can be extremely facilitated as compared with the case where the scattering section is formed in the recording layer.
- the entire surface of the recording layer can be used as a surface for recording information, and the aberration can be detected temporally continuously.
- the optical disk 66 is provided with a reflective layer 68 parallel to the recording layer in the recording layer stack 67 so that tilt aberration and coma of light reflected from the reflective layer are not canceled.
- the optical disk device of the present embodiment is an example in which the wavefront of the outward light is deformed into a predetermined shape instead of providing the reflective layer so that the tilt aberration and coma of the reflected light from the recording layer are not canceled. is there.
- a method of deforming the wavefront of the outward light a method of leaving a predetermined amount of spherical aberration or defocus aberration on the wavefront can be considered. Therefore, the configuration in the fourth embodiment is almost the same as that in FIG.
- the optical disk of the present embodiment does not have a reflective layer for producing defocused reflected light.
- the optical disc device of the present embodiment does not include the even symmetric aberration sensor 6S in FIG. 3 because the optical disc device detects only the laser beam reflected by the recording layer.
- the point that the force operation is the same as that of the structure is different in that the deformable mirror 6Q in the optical disk device in FIG. 3 cancels the spherical aberration. It is deformed.
- FIG. 11 is a diagram showing a configuration of an optical disk device according to Embodiment 4 of the present invention, and illustrates an optical disk device to which a method of leaving a predetermined amount of spherical aberration in outward light is applied.
- the optical disc 131 has a configuration in which the reflective layer 53 is removed from the multilayer optical disc shown in FIG.
- the laser 61, the laser driving circuit 60, and the collimating lens 62 shown in FIG. 11 have the same configuration as in FIG.
- the light beam collimated by the collimator lens 62 is corrected for spherical aberration by the deformable mirror 6Q.
- the spherical aberration correction value of the deformable mirror 6Q is determined by the servo controller 6U. Servo control When the spherical aberration amount signal is input from the tilt sensor 6P, the roller 6U performs a predetermined calculation based on the value and determines a spherical aberration correction value. This spherical aberration correction value is a value calculated so that a predetermined amount of spherical aberration remains.
- the servo controller 6U controls the deformable mirror 6Q through the deformable mirror drive circuit 6R so that the surface corresponds to the spherical aberration correction value.
- the spherical aberration contained in the laser beam 57 focused on the predetermined recording layer 59 in the recording layer stack 52 shown in FIG. 2 is controlled so as to be a certain amount. .
- the laser beam emitted from the deformable mirror 6Q passes through the polarizing beam splitter 63, passes through the quarter-wave plate 6T, and enters the objective lens 64.
- the servo controller 6U controls the objective lens actuator 65 based on the amount of defocus aberration from the tilt sensor 6P.
- the objective lens actuator 65 drives the objective lens 64 so that laser light is focused on a predetermined recording layer in the recording layer stack 67.
- the laser beam that has reached a predetermined recording layer in the recording layer stack 67 is reflected by the predetermined recording layer in the recording layer stack 67 and returns to the objective lens 64.
- the forward light and the backward light that is, the tilt aberration and coma aberration of the laser light condensed and reflected on a predetermined recording layer in the recording layer stack. Is not canceled.
- the laser light returned to the objective lens 64 passes through the objective lens 64 and the quarter-wave plate 6T, is reflected in a direction different from that of the outward light by the polarization beam splitter 63, and enters the tilt sensor 6P. Incident.
- the laser light incident on the tilt sensor 6P is incident on the deformable mirror 6A.
- the deformable mirror driving circuit 6B changes the mirror shape of the deformable mirror 6A in accordance with the spherical aberration control signal 6M input from the spherical aberration canceling controller 61.
- the deformable mirror 6A cancels the spherical aberration of the laser beam incident on the tilt sensor 6P.
- This spherical aberration is the amount of a predetermined amount of spherical aberration left by the deformable mirror 6Q. If a beam spot with sufficient intensity can be obtained on the pinhole group 6F described later without canceling the spherical aberration, the deformable mirror 6A is not required.
- the laser beam reflected by the deformable mirror 6A enters the hologram 6C.
- two types of bias X-coma with the same size but different signs two types of bias Y-coma with the same size but different signs
- two types of bias defocus aberration with the same size but different signs Eight kinds of bias aberrations, two kinds of bias spherical aberrations having the same magnitude and different signs are controlled.
- the amount of aberration of each bias aberration is determined by the amount of aberration to be detected, and is preferably about half the amount of aberration to be detected.
- the laser beam to which the bias aberration has been added by the hologram 6C enters the condenser lens 6D.
- the condenser lens 6D is held by a condenser lens actuator 6E.
- the condenser lens actuator 6E moves the focus position of the condenser lens 6D according to the defocus aberration control signal 6L input from the defocus aberration.
- Spherical aberration cancel controller 61 As described above, moving the condenser lens 6D cancels the defocusing error. If a sufficiently strong beam spot can be obtained on the pinhole group 6F described later without canceling the defocus aberration here, the condenser lens actuator 6E is not required. It may be fixed at the position.
- the laser light incident on the condenser lens 6D is condensed on the pinhole group 6F.
- Eight pinholes corresponding to the added bias aberration are provided on the pinhole group 6F.
- the radius of each pinhole is, for example, 1 / 1.22 times the diameter of the Airy disk.
- the laser beam that has passed through the pinhole group 6F is incident on the photosensor corresponding to each pinhole on the photosensor group 6G.
- the light incident on the photo sensor is converted into an electric signal and input to the aberration mode detection circuit 6H.
- the aberration mode detection circuit 6H differentially amplifies the signal input from each photo sensor for each aberration mode, and outputs an X-Y tilt detection signal 6N (X- ⁇ coma aberration detection signal), a defocus aberration signal 6J, and a spherical aberration. Outputs signal 6K.
- the X—Y tilt detection signal 6N (X—Y coma aberration detection signal) is the output of the tilt sensor 6P.
- the defocus aberration signal 6J, the spherical aberration signal 6K, and the XY tilt detection signal 6N are input to the defocus aberration′spherical aberration cancel controller 61.
- the defocus aberration 'spherical aberration canceling controller 61 receives the differential input from the aberration mode detection circuit 6H. Based on the okas aberration detection signal 6J, a defocus aberration control signal 6L for canceling the defocus aberration of the laser incident on the condenser lens 6D is created, and the created defocus aberration control signal 6L is collected. Output to the actuator 6E.
- the spherical aberration canceling controller 61 is configured to cancel spherical aberration of the laser beam incident on the deformable mirror 6A based on the spherical aberration signal 6K input from the aberration mode detection circuit 6H.
- a signal 6M is created, and the created spherical aberration control signal 6M is output to the deformable mirror drive circuit 6B.
- the defocus / spherical aberration cancel controller 61 outputs four signals of a defocus aberration detection signal, a spherical aberration detection signal, and an XY tilt detection signal to the servo controller 6U.
- the servo controller 6U and the defocus / spherical aberration canceling controller 6I are connected by a bidirectional communication line.
- the servo controller 6U operates the objective lens actuator 65 to control the objective lens 64 so that the laser beam is focused on a predetermined recording layer in the recording layer stack 67. I do.
- An example of a control procedure from the initial state to the output of the tilt detection signal is shown below.
- the objective lens actuator 65 once makes the laser beam converge on the surface of the optical disk 66 (or the uppermost recording layer of a plurality of recording layers in the recording layer stack 67). Then, the objective lens 64 is moved to the approximate position.
- the servo controller 6U drives the objective lens actuator 65 to control the surface of the optical disk 66 (or the uppermost recording layer of a plurality of recording layers in the recording layer stack 67).
- the position of the objective lens 64 is adjusted so that the "S-shaped curve" can be detected with the defocus aberration signal 6J using the reflected light reflected by the light source.
- the defocus aberration / spherical aberration cancel controller 61 drives the condenser lens actuator 6E of the tilt sensor 6P to adjust the position of the condenser lens 6D.
- the deformable mirror 6A and the deformable mirror 6Q perform spherical aberration correction corresponding to the surface of the optical disk 66 so that the spherical aberration correction amount is the same.
- the servo controller 6U receives the spherical aberration of the defocus aberration signal 6J of the tilt sensor 6P in the same manner as in (2). Based on the aberration signal 6K, the objective lens 64, the deformable mirror 6Q, the condenser lens 6D, and the deformable mirror 1A are controlled so that the laser beam is focused on a predetermined recording layer in the recording layer stack 67. .
- the servo controller 6U controls the correction amount of the spherical aberration between the deformable mirror 6A and the deformable mirror 6Q with a predetermined difference.
- the XY tilt detection signal output at this time detects the tilt of the recording layer in the recording layer stack 67.
- the servo controller 6U detects the "S-shaped curve" with the defocus aberration signal 6J of the tilt sensor 6P, and controls the objective lens 64 so that the laser light is focused on a predetermined recording layer.
- the servo controller 6U detects the “S-curve” with the spherical aberration signal 6K of the tilt sensor 6P, and gives a predetermined amount of difference between the corrected spherical aberration of the deformable mirror 6A and the deformable mirror 6Q. Control.
- deforming the wavefront of the outward light means that the shape of the converging point on the recording layer of the optical disc 131, that is, the beam spot is not narrowed down to the diffraction limit. This means that the beam spot becomes large and the recording density decreases. Therefore, the deformation of the wavefront of the outward light does not affect the recording capacity of the user data, so that the predetermined time, for example, the area where significant data is not recorded, the area such as run-in and run-out in the data format, etc. Is performed in a time-sharing manner.
- the tilt detection according to the present embodiment is performed with laser light having a wavelength different from the laser light for recording and reproduction, the time-division processing is necessary.
- a shape of the wavefront that deforms the wavefront of the outward light there is a method of narrowing the aperture other than reducing a predetermined amount of defocus aberration and spherical aberration.
- the effect of the deformation of the wavefront and the narrowing of the aperture increase the beam spot on the recording layer, and the effect that the unevenness on the recording layer can be regarded as a scattering surface, and the effect that the recording marks on the recording layer are scattered It becomes a substance and generates the effect of generating scattered light.
- the predetermined defocus aberration and spherical aberration are included in the wavefront of the laser light applied to the recording layer, so that the recording layer is flat. Even if there is, the tilt light or coma aberration corresponding to the tilt of the recording layer can be detected by the reflected light, and the tilt can be detected with high accuracy.
- the optical disk devices according to Embodiments 1 to 4 detect tilt of the optical disk by detecting light reflected by the optical disk.
- the tilt aberration and the coma aberration of the laser light transmitted through the recording layer and emitted to the surface of the optical disk on the side opposite to the laser light incident surface are detected. Detect the tilt of.
- FIG. 12 is a diagram for describing the principle of tilt detection according to the fifth embodiment of the present invention.
- FIG. 12 shows an example in which the number of recording layers is one, but the same applies to a case where a plurality of recording layers are stacked.
- FIG. 12 shows the optical path of the laser light that is focused on the flat recording layer 44 when the optical disc is tilted and turned.
- the optical axis 40 of the laser beam is inclined by a predetermined angle 48 with respect to a normal 41 of the recording layer 44, and this angle 48 is a tilt angle.
- the laser light incident from the optical disk front surface 45 passes through the upper substrate 42, the recording layer 44, the lower substrate 43, and the optical disk rear surface 46, respectively, and is emitted to the outside.
- the optical path 47a passes through B1 on the optical disk front surface 45, Cl on the recording layer 44, and Dl and El on the rear surface of the optical disk from A1.
- the optical path 47a and the optical path 47b symmetrical with respect to the optical axis 40 pass from A2 through B2 on the optical disk surface 45, C2 on the recording layer 44, and D2 and E2 on the back surface of the optical disk.
- the optical path length from B1 to C1 is shorter than the optical path length from B2 to C2 because the optical disc is tilted, and the optical path length from C1 to D1 is Because the disk is tilted, it is shorter than the optical path length from C2 to D2. Therefore, the optical path 47a is shorter than the optical path 47b.
- Optical paths symmetrical to the optical axis 40 have a similar relationship. Therefore, due to the tilt of the optical disk, an asymmetric aberration appears on the optical axis in the transmitted laser light, which becomes a tilt aberration and a coma aberration. Therefore, unlike when tilt is detected by reflected light from the recording layer, tilt aberration and coma are not canceled by transmitted light. As shown in FIG. 12, when the optical disc is tilted, tilt aberration and coma remain in the laser beam transmitted through the optical disc without being canceled.
- FIG. 13 is a diagram illustrating a configuration of an optical disk device according to Embodiment 5 of the present invention, and illustrates an optical disk device when a method of detecting a tilt of an optical disk by transmitted light is applied.
- the optical disk 140 has a structure in which the reflection layer 68 is removed from the optical disk 66 shown in FIG. 3 so that the light passes through the recording layer stack 67 and further transmits through the surface opposite to the laser light incident surface.
- a part of the laser beam focused on a predetermined recording layer in the recording layer stack 67 passes through the recording layer stack 67, and is further transmitted to the optical disc 140 from a surface opposite to the laser light incident surface. Fire outside.
- Another part of the laser light focused on a predetermined recording layer in the recording layer stack 67 is reflected and returns to the objective lens 64.
- the laser beam returned to the objective lens 64 passes through the objective lens 64 and the quarter-wave plate 6 ⁇ , is reflected in a different direction from the outward light by the polarization beam splitter 63, and enters the even symmetric aberration sensor 6S. .
- the laser beam reflected by plane mirror 102A and incident on even symmetric aberration sensor 6S is incident on hologram 6W.
- the hologram 6W four kinds of bias aberrations, namely, two kinds of bias defocus aberrations having different signs and the same magnitude and two kinds of bias spherical aberrations having different signs and the same magnitude are controlled.
- the amount of aberration of each bias aberration is determined by the amount of aberration to be detected, and is preferably about half of the amount of aberration to be detected.
- the laser beam to which the bias aberration has been added by the hologram 6W enters the condenser lens 6X.
- the position of the condenser lens 6X is adjusted so that the laser light from the focal point of the objective lens 64 is focused on the pinhole group 6Y.
- the laser beam incident on the condenser lens 6X is focused on the pinhole group 6Y.
- Four pinholes corresponding to the bias aberration added by the hologram 6W are provided on the pinhole group 6Y.
- the radius of each pinhole is 1 / 1.22 times the diameter of the Airy disk, for example.
- the laser beam that has passed through the pinhole group 6Y is incident on the photosensor corresponding to each pinhole on the photosensor group 6Z.
- the light incident on the photo sensor is converted into an electric signal and input to the aberration mode detection circuit 610.
- the aberration mode detection circuit 610 differentially amplifies the signal input from each photosensor for each aberration mode, and outputs the differentially amplified force aberration signal 14A and spherical aberration signal 14B to the servo controller 143.
- the servo controller 143 controls the deformable mirror driving circuit 6R for driving the deformable mirror 6Q and the objective lens actuator 65 for driving the objective lens 64 according to the values indicated by the defocus aberration signal 14A and the spherical aberration signal 14B. I do.
- the laser light transmitted through the optical disc 140 is incident on the transmission-side objective lens 141.
- the objective lens 64 and the transmission-side objective lens 141 are controlled by the servo controller 143 so that the focal point of the objective lens 64 and the focal point of the transmission-side objective lens 141 coincide. Therefore, the transmission side objective lens 141 converts the laser beam incident on the transmission side objective lens 141 into parallel light.
- the laser beam emitted from the transmission-side objective lens 141 is reflected by the plane mirror 102B and enters the tilt sensor 144.
- the laser beam that has entered the tilt sensor 144 enters the hologram 145.
- the hologram 145 has two types of bias defocus aberrations of the same size but different signs, two types of bias X tilt aberrations of the same size but different signs, and two types of bias tilts of the same size but different signs Y tilt aberration and codes
- a total of 10 types of bias aberrations are added to the laser beam: two types of bias 0-degree astigmatism having the same size but different, and two types of bias 45-degree astigmatism having the same size but different signs.
- the amount of deviation of each bias aberration is determined by the amount of aberration to be detected, and is preferably about half of the amount of aberration to be detected.
- the laser light to which the Bayer-Is-Assian aberration difference has been added in the holologogram 114455 is incident on and incident on the condensed light Relens 114466.
- the condensed light lens 114466 is used to transfer the laser light from the condensed light point of the object focused lens 6644 and the condensed light lens 114466 to the pin pin hohler group 114477. The position is adjusted and adjusted so as to converge and condense light on the top. .
- the laser beam emitted and incident on the converging and condensing light lenses 114466 is converged and condensed on the Pippinhohaul group 114477. .
- On the Pippin Hall group 114477 there are 1100 pieces corresponding to the Babiah-Ass aberration difference added by the hologram program 114455.
- the Pipin'n Hoehulle has been set up. .
- the semi-radius of each of the pin-pins is set to be, for example, 11 // 11..2222 times the diameter of the air ally disk. You. .
- the laser light that has passed through the Pippin Hall group 114477 corresponds to each of the Pijn Pho Hall rules on the Photin Sessensasa group 114488
- the incident light is incident on the corresponding photo sensor. .
- the light incident on and incident on the photo sensor is converted into an electrical and electronic signal and converted into an aberration difference mode detection and detection circuit.
- the input is input to .
- the aberration detection mode detection circuit 114499 outputs the signal input and output by each photo sensor for each aberration mode.
- the differential differential amplification and amplification width is increased, and the differential differential amplification and amplification width is increased by the differential detection and detection signal, the XX tilt and tilt detection detection signal, and the YY and tilt detection detection signal.
- the signal, the 00-degree non-astigmatism aberration detection detection signal, and the 55-th of the 4455-degree non-astigmatism aberration detection detection signal Output the signal to the server controller 114433. .
- the object and the lens Renzens 6644 are transparent.
- the optical axes of the transmission side and the object lens 114411 coincide with each other.
- the collection of the objective lens 6644 and the transmission side and the objective lens 114411 is performed.
- the convergent light point points coincide.
- the sensor boa control controller 114433 is capable of receiving the detection signal of the 00-degree astigmatism aberration detection detection signal and the detection signal of the 4455-degree astigmatism aberration detection signal.
- the transmission side and the objective lens are connected to the transmission side and the object lens 114114 so that the signals are both minimum and minimum.
- the optical axis of the object lens 6644 and the transparent side of the object and the object lens 114411 are aligned with each other to control the position of the 114411. Let them be lethal. . Not at all to the ,, Sasa over Bobo Koh Kong down Totoro low over Lara 114433 mother ,, de def Foo over Kaka soot yield aberration difference detection detection crepe de Chine signal issue of the ,, Toru transparent to Nana Ruru various to the to the highest minimum Small
- the position of the transmission side and the object lens 114411 is controlled and controlled by the transmission side and the object lens actuator 114422.
- the converging and converging light point points of the object lens 6644 and the transmissive transmission side side and the object lens lens 114411 are made to coincide with each other. .
- the XX and XY tilt detection detection signals when the detection and detection signal of the other one is minimum and minimum. In this way, the detection of the tilt in the XX direction and the detection in the YY direction is completed.
- the sensor controller is based on the XX tilt detection signal and the YY tilt detection signal. By controlling the actuator 6655 and the transmissible side opposite object lens actuator 114422, it controls the object lens 6644 and transparent object.
- the transmission side side and the objective lens 114411 and * According to the optical disk device of the present embodiment as described above, a part of the laser light applied to the recording layer is transmitted and emitted from the surface opposite to the laser light incident surface, and By detecting the inclination of the wavefront of the laser light emitted from the surface opposite to the light incident surface, highly accurate tilt detection of the optical disk becomes possible.
- the scattered substance is irradiated with a light beam having a small numerical aperture (hereinafter, referred to as NA: Numerical Aperture), and the scattered light is received by an objective lens having a large NA.
- NA Numerical Aperture
- FIG. 14 is a diagram for explaining the principle of tilt detection according to the sixth embodiment of the present invention.
- FIG. 14 (a) is a diagram showing a cross section of an optical disc
- FIG. FIG. 15 is a diagram showing forward light and backward light when the optical disc is viewed from the optical axis direction in a cross section 39 perpendicular to the optical axis 30 in FIG. 14 (a).
- FIG. 14A shows an example in which the number of recording layers is one for simplicity, the same applies to a case where a plurality of recording layers are stacked.
- the optical axis 30 of the laser beam is inclined by a predetermined angle 36 with respect to the normal 31 of the recording layer 32, and this angle 36 is the tilt angle.
- the laser light having the wavelength ⁇ ⁇ incident on the base material 37 is scattered by the scattering portion 33 of the recording layer 32, and becomes scattered light having a wavelength ⁇ 0.
- the forward optical path 34 has a small numerical aperture, that is, ⁇ , and is focused on the recording layer 32.
- the outward optical path 34 is scattered by the scattering material 33 on the recording layer 32 and scatters at a wide angle around the normal 31 of the recording layer.
- the scattered light at the opening that is, the reflected light in the part of the return path 35 that does not overlap with the path of the forward path 34, will not be canceled by the tilt.
- That portion is the optical path 38 that does not cancel the aberration in FIG. 14A, that is, the outer annular zone opening of the return optical path 35.
- the optical path 3a which is the combination of the forward optical path 34 and the return optical path 35 with a small NA, is at the center, and the return optical path 35, which is a part of the scattered light, is distributed over a wide area including the central part. I have.
- the outer peripheral orifice opening of the optical path 38 where the aberration is not canceled is only the return optical path 35. Therefore, the tilt can be detected by the return optical path 35.
- FIG. 15 is a diagram showing a configuration of an optical disk device according to Embodiment 6 of the present invention.
- the configuration of the sixth embodiment is almost the same as that of the second embodiment, and a description thereof will be omitted.
- the differences from the second embodiment are the operation of the deformable mirror 6Q and the function of the hologram 104.
- the deformable mirror 6 Q During recording or reproduction (hereinafter, referred to as a recording / reproduction mode), the deformable mirror 6 Q gives spherical aberration to the light from the collimator lens 62 and is added until the outward light is focused on the recording layer. Spherical aberration is canceled. Further, the deformable mirror 6Q periodically or at a predetermined timing kicks the outer annular zone portion of the deformable mirror 6Q and irradiates the scattering unit 101 with a light beam having a small NA (hereinafter, referred to as a tilt detection mode). .
- the NA in the recording / playback mode is preferably 0.6 or more and 0.85 or less.
- the NA in the tilt detection mode where the outer orbital zone is kicked is desirably 0.1 or more and 0.2 or less.
- the light beam with a small NA whose outer peripheral portion has been kicked by the deformable mirror 6Q, ie, the outward light, passes through the polarizing beam splitter 63, the 1Z4 wavelength plate, and the objective lens 64, and passes through predetermined recording in the optical disc 103. Focus on the layer.
- the recording layer is provided with a scattering portion 101, and when the light beam is focused on the scattering portion 101, scattered light is generated.
- the tilt detection is performed with the light received by the objective lens 64 among the scattered light. This light is called return light. Therefore, the NA of the return light is larger than the NA of the outward light.
- the NA of the return light at this time is desirably 0.6 or more.
- this is the power return light indicated by the one-dot chain line.
- the return light passes through the objective lens 64 and the quarter-wave plate 6T, is reflected by the polarization beam splitter 63, is further reflected by the mirror 102, and is incident on the tilt sensor 151.
- the tilt sensor 151 is a modal sensor of the same type as the tilt sensor 108 of the second embodiment shown in FIG. 8, but the tilt detection is indicated by a dashed-dotted line as in the second embodiment.
- the difference is that not all the light in the specified range is used but a substantial portion is used as the portion 38 where the aberration is not canceled shown in FIG.
- almost all of the light in this portion is scattered light, so the effect of non-scattered light is eliminated, and a high SN ratio can be obtained even with weak scattered light.
- the defocus error and the spherical aberration are detected.
- Hologram 152 It is divided into two parts. One is the outer annular zone (the part where the aberration in Fig. 14 (b) is not canceled 38), where positive and negative bias coma are given for tilt detection in two directions, X and Y directions. Part. The other part is the central part (the overlapping part 3a of the forward light path 34 and the backward light path 35 in FIG. 14 (b)), and is a part to which positive and negative bias defocus aberration and positive and negative bias spherical aberration are given. ing.
- Each return light to which the bias aberration is given passes through the condenser lens 6D and is condensed on a different pinhole on the pinhole group 154.
- Light that has passed through the pinhole group 154 is incident on separate photosensors on the photosensor group 153, respectively.
- a detection signal corresponding to each photosensor is sent to the aberration mode detection circuit 155.
- the aberration mode detection circuit 155 generates a differentially amplified signal of a paired signal to which each of the positive and negative bias aberrations is given, and outputs an XY tilt detection signal, a defocus detection signal, and a spherical aberration detection signal, respectively. .
- the forward light is smaller than the backward light.
- the phase influence of the outward light is further reduced, and the tilt detection accuracy of the backward light can be improved.
- the SN ratio is improved, and the tilt detection accuracy of the return light can be further improved.
- one light beam is switched by the deformable mirror 6Q between the tilt detection mode and the recording / reproducing mode in time series, so that the configuration is different from that in Embodiment 2 or the like. It can be simplified.
- the optical disc in Embodiment 6 may have a recording layer and a scattering layer as shown in FIG.
- the deformable mirror 6Q switches the focused beam between the recording layer and the scattering layer while changing the focus position as well as the numerical aperture when switching modes.
- aberration detection and recording / reproduction can be performed with a single beam, and the timing of irradiating the scattering section with laser light can be arbitrarily set on the device side. Optimization with respect to the trade-off is easy. For example, when the tilt of the optical disc is small, the frequency of detecting the aberration can be reduced.
- an optical disk which does not particularly intentionally form a scattering portion may be used as the optical disk.
- the optical disc has a scattering property such that a part of the incident light is scattered toward the annular zone side.
- the beam spot diameter of the laser beam on the recording layer increases. Under such conditions, the recording mark itself in the beam spot acts almost equivalently to the scattering particles, and a sufficiently high level of scattering can be obtained.
- the force described above using the case of an optical disc The present invention widely covers a recording medium capable of recording or reproducing information by irradiating a laser, and a device or method for controlling the recording medium. It is.
- the optical disc device includes a transparent flat disc base material, a recording layer provided on the disc base material, and a reflection layer having a predetermined positional relationship with the recording layer.
- a light source that irradiates a light beam to the recording layer through the disk base material to form a condensed spot on the recording layer, and a reflected light reflected by the reflection layer.
- a tilt detecting means for detecting a tilt of the optical disc by using an output of the photodetector.
- tilt can be detected even if there are no grooves or pits in the recording layer of the optical disc, effectively suppressing a decrease in the amount of light due to diffraction and scattering in other recording layers in multi-layer recording in which multiple recording layers are stacked. can do.
- the recording layer is closer to the light beam incident surface than the reflective layer.
- an aberration canceling unit formed in an optical path for guiding the reflected light to the photodetector and canceling defocus aberration and spherical aberration of the reflected light is further provided.
- the aberration canceling unit includes a wavefront control device that controls a wavefront of the reflected light.
- the wavefront control device can arbitrarily change the wavefront of the reflected light, so that the spherical aberration included in the reflected light can be canceled with a simple configuration.
- the aberration canceling unit further includes a condenser lens for condensing the reflected light on the photodetector, and a lens moving unit for moving the condenser lens.
- the focusing lens is moved using the lens moving means, so that the defocus aberration can be canceled by changing the position of the focusing lens, and the accuracy of tilt detection can be improved. Can be improved.
- the optical disc according to the present invention includes a transparent flat disc base material, a recording layer provided on the disc base material, and a reflection layer for reflecting a light beam incident through the disc base material.
- a recording medium, and the recording medium is disposed at a position facing the disk substrate with the recording layer interposed therebetween, and a distance between the recording layer and the reflection layer is set to be longer than a wavelength of the light beam. It is characterized by.
- the reflected light reflected by the reflective layer includes the tilt aberration and the coma aberration without being canceled, and the tilt detection is performed using the tilt aberration and the coma aberration. It can be carried out.
- the recording layer is formed of a photoisomerizable material that causes a two-photon absorption phenomenon when irradiated with a light beam.
- the refractive index of only the photoisomerizable material at the focal point of the light beam can be changed by utilizing the two-photon absorption phenomenon.
- the recording layer to be recorded can be selected.
- the optical disc device includes a transparent flat disc base material and the disc.
- a light beam emitted from a light source is applied to an optical disc including a recording layer provided on a disc base material and a scattering part for randomizing at least partly the phase of a light beam incident through the disc base material.
- a light source that irradiates the scattering portion via a base material to form a condensed spot, a light detector that receives scattered light scattered by the scattering portion, and an output of the light detector.
- a tilt detecting means for detecting a tilt of the optical disc.
- the light source generates a first light beam, and condenses the first light beam on an information recording unit on the recording layer to form a first condensing spot.
- a second light source forming a spot, wherein the photodetector includes a first detector that receives the first light beam reflected by the first condensing spot, and a second collector.
- a second detector for receiving the second light beam reflected by the light spot, wherein the tilt detection means performs tilt detection of the optical disk using an output of the second light detector.
- recording information detecting means for detecting information recorded on the recording layer using an output of the first photodetector. It is preferable that
- the two light beams of the first light beam for detecting information recorded on the recording layer and the second light beam for performing tilt detection are separately provided. Therefore, reading of information recorded on the recording layer and detection of tilt can be performed at the same time.
- the optical disc according to the present invention has a transparent flat disc base material, a recording layer provided on the disc base material, and a light beam incident through the disc base material having a small phase.
- the scattering section randomizes the phase of the wavefront including the aberration generated on the outward path of the light beam, and the tilt is detected using the reflected light from the scattering section.
- the scattered light is no longer scattered, The correlation between the path light and the wavefront is reduced or uncorrelated, and the light after being scattered, that is, the aberration of the return light is added, and the tilt aberration and coma are not canceled.
- This behaves as if a new point light source is provided at the center of the scattering.
- the scattered light scattered by the scattering unit includes the tilt aberration and the coma aberration without being cancelled, the tilt can be detected using the tilt aberration and the coma aberration.
- the scattering portion is provided in the recording layer.
- the scattering portion is provided in the recording layer, so that the light beam can be scattered by condensing the light beam on the scattering portion of the recording layer.
- the scattering section is a servo mark provided on the recording layer.
- the light beam can be scattered by using a servo mark provided on the recording layer, which does not require a separate scattering portion for scattering the light beam.
- the scattering section may be provided in a layer different from the recording layer.
- the scattering portion is provided in a different layer other than the recording layer, so that the manufacture of the optical disc is extremely easy as compared with the case where the scattering portion is formed in the recording layer.
- the entire surface of the recording layer can be used as a surface for recording information, and aberration detection can be performed continuously in time.
- the scattering portion has at least one of a concave portion and a convex portion on a surface, and irregularly reflects the light beam.
- the light beam can be irregularly reflected by the scattering portion having at least one of the minute concave portion and the convex portion on the surface.
- the depth of the concave portion or the height of the convex portion is equal to or more than a half wavelength of the light beam.
- the scattering portion is formed of a medium having transparency to the light beam, and a scattering material that reflects the light beam is provided in the medium with a surface force, the light, and the like. It is preferred to disperse over a depth of at least half a wavelength of the beam.
- the incident light beam is scattered at various depths. Since the phase is randomized by being reflected by the light and the randomized phase of the light beam contains tilt aberration and coma without being canceled, tilt detection is performed using this tilt aberration ⁇ coma aberration. It can be performed.
- the scattering substance is formed by altering the medium by selectively imparting higher energy to the medium than the light beam.
- the scattering medium can be formed by selectively imparting higher energy than the light beam to the medium to alter the medium.
- the scattering substance is such that a light absorber serving as a nucleus is dispersed and disposed in the medium, and the energy of the light beam is selectively absorbed by the light absorber to grow the nucleus. It may be formed by things.
- the light absorber serving as the nucleus is dispersed and arranged in the medium, the energy of the light beam is selectively absorbed by the light absorber, the nucleus grows, and the scattering material is removed. Able to shape.
- the scattering section emits light having a wavelength different from the wavelength of the light beam.
- the energy of the light beam is absorbed, and light of a different wavelength is emitted. Therefore, the outgoing light has little or no correlation with the wavefront of the incident light beam, adds the aberration of the returning light, and includes tilt aberration and coma without being canceled. Tilt detection can be performed using aberrations.
- light having a wavelength different from the wavelength of the light beam is fluorescent light.
- the energy of the light beam focused on the focused recording layer is absorbed, and a portion that emits fluorescence of a different wavelength is provided on the focused recording layer.
- the tilt of the focused recording layer is detected.
- the fluorescent light is no longer correlated with the outgoing light, that is, the wavefront of the incident light beam, or becomes uncorrelated.
- the tilt and coma are not canceled. Therefore, the form that emits fluorescence is also one form of the scattering section.
- the optical disc device includes a transparent flat disc base material and the disc.
- a light source that irradiates a light beam to the recording layer via the disk substrate with respect to an optical disk including a recording layer provided on a disk base, a photodetector that receives reflected light from the optical disk,
- a forward optical system for causing a light beam emitted by the light source to enter the optical disc at a first numerical aperture, and receiving reflected light from the optical disc at a second numerical aperture larger than the first numerical aperture. It is characterized by comprising a return optical system for leading to the photodetector, and a tilt detecting means for detecting a tilt of the optical disk by using an output of the photodetector.
- the first numerical aperture is 0.2 or less, and the second numerical aperture is 0.6 or more.
- the numerical aperture of the outward light can be made smaller than the numerical aperture of the backward light, the numerical aperture of the outward light can be made 0.2 or less, and the numerical aperture of the backward light can be reduced to 0. ⁇
- the tilt detection accuracy of the return light can be further improved.
- the optical disc is provided with a scattering section for at least partially randomizing the phase of the reflected light.
- aberration detection and recording / reproduction can be performed with one beam, and the timing of irradiating the scattering section with a light beam can be arbitrarily set on the device side. It is easy to optimize the trade-off between recording and playback transfer speed.
- a recording / reproducing mode in which a light beam irradiated by the light source is converged on an information recording section on the recording layer to perform at least one of recording and reproduction on the information recording section.
- one light beam is switched in time series between the tilt detection mode and the recording / reproduction mode by the numerical aperture switching means (deformable mirror 6Q), so that the configuration of the device is simplified.
- the deformable mirror 6Q in Embodiment 6 corresponds to an example of a numerical aperture switching unit.
- the return optical system may be configured such that the reflected light from the optical disc is in an orbicular zone region that is larger than the first numerical aperture and equal to or smaller than the second numerical aperture.
- light is directed to the light detector.
- the optical disc device provides an optical disc having a transparent flat disc base material and a recording layer provided on the disc base material by applying a light beam to the disc base material.
- a light source that irradiates the recording layer through the light source to form a condensed spot on the recording layer
- a wavefront control device that controls a wavefront of the light beam that irradiates the recording layer, and a light reflected by the recording layer.
- a light detector for receiving light wherein the wavefront control device controls the wavefront of the light beam applied to the recording layer in a time-division manner so as to include a predetermined amount of defocus aberration or spherical aberration, and And tilt detecting means for detecting tilt of the optical disc by detecting tilt aberration or coma included in the optical disc using the output of the photodetector.
- the wavefront of the light beam applied to the recording layer includes a predetermined defocus aberration and spherical aberration. Therefore, even if the recording layer is flat, the reflected light of the recording layer can be used.
- the tilt aberration or the coma aberration corresponding to the tilt can be detected, and the tilt can be detected with high accuracy.
- the deformable mirror 6Q in Embodiment 4 corresponds to an example of the wavefront control device.
- aberration cancellation is formed in an optical path for guiding the reflected light of the light beam reflected by the recording layer to the photodetector, and cancels defocus aberration and spherical aberration of the reflected light.
- it further comprises means.
- the defocus aberration and the spherical aberration of the reflected light are canceled, so that it is possible to detect only the aberration required for tilt detection, for example, only the tilt aberration and coma.
- the deformable mirror 6A in Embodiment 4 corresponds to an example of the aberration canceling unit.
- the optical disc device provides an optical disc having a transparent flat disc base material and a recording layer provided on the disc base material by applying a light beam to the disc base material.
- a light source that irradiates the recording layer through the light source, the optical disc transmits at least a part of the light beam irradiated by the light source, and a light detector that receives the light beam transmitted through the optical disc;
- tilt detecting means for detecting tilt of the optical disc using an output of a photodetector.
- the tilt aberration and coma of the transmitted light beam are not canceled, so that the tilt of the optical disk can be reduced by detecting the tilt aberration and coma of the transmitted light beam. Can be detected.
- the optical disc according to the present invention comprises a transparent flat first disc base and a second disc base, and the first disc base and the second disc base.
- a recording layer that is provided therebetween and transmits at least a part of the light beam emitted through the first disk base material to the second disk base material.
- the optical disc (optical disc-shaped information recording medium) according to the present invention is capable of storing digital data. It is useful for recording, reproduction, etc., and is useful for an optical disc device that performs at least one of recording information on a recording layer of an optical disc and reproducing information from the recording layer.
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Abstract
Description
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JP2005516560A JP4427512B2 (ja) | 2003-12-16 | 2004-12-13 | 光ディスク装置及び光ディスク |
US10/560,810 US7903531B2 (en) | 2003-12-16 | 2004-12-13 | Optical disk apparatus for detecting tilt of an optical disk, and an optical disk for tilt detection |
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JP2003-417774 | 2003-12-16 | ||
JP2003417774 | 2003-12-16 |
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JP2008097753A (ja) * | 2006-10-13 | 2008-04-24 | Sony Corp | 光ディスク装置及び焦点位置制御方法 |
JP2008097754A (ja) * | 2006-10-13 | 2008-04-24 | Sony Corp | 光ディスク装置、焦点位置制御方法及び体積型記録媒体 |
WO2011151909A1 (ja) * | 2010-06-03 | 2011-12-08 | パイオニア株式会社 | チルト補正方法及び装置、光ピックアップ並びに情報記録再生装置 |
WO2013005378A1 (ja) * | 2011-07-07 | 2013-01-10 | パナソニック株式会社 | 光記録媒体およびその製造方法 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US7397018B1 (en) * | 2005-03-02 | 2008-07-08 | Lockheed Martin Corporation | Amplitude and phase controlled adaptive optics system |
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JP5169981B2 (ja) * | 2009-04-27 | 2013-03-27 | ソニー株式会社 | 光ピックアップ、光ディスク装置、光ピックアップ製造方法及び光ピックアップ制御方法 |
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TW201133472A (en) * | 2010-03-23 | 2011-10-01 | Hon Hai Prec Ind Co Ltd | Deviation disc recognizing method and device |
JP2013094816A (ja) * | 2011-11-01 | 2013-05-20 | Omron Corp | 焦点調整装置およびレーザ加工装置 |
TWI509279B (zh) * | 2012-03-28 | 2015-11-21 | Sony Corp | An optical element and a method for manufacturing the same, an optical system, an image pickup device, an optical device, and a master disk |
CN111564166B (zh) * | 2020-05-06 | 2021-09-03 | 杭州郜灵科技有限公司 | 一种计算机存储设备用磁盘维护设备 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04366428A (ja) * | 1991-06-13 | 1992-12-18 | Toshiba Corp | 光ヘッドおよび光情報記録装置 |
JPH07272299A (ja) * | 1994-03-31 | 1995-10-20 | Nippon Columbia Co Ltd | 光ディスクの傾き検出方法および傾き検出機能を有する光学ヘッド |
JPH0845080A (ja) * | 1994-07-27 | 1996-02-16 | Sony Corp | 光ディスク及びクロストーク検出装置 |
JP2000076678A (ja) * | 1998-08-27 | 2000-03-14 | Pioneer Electronic Corp | 光ピックアップ装置 |
JP2001505701A (ja) * | 1996-12-05 | 2001-04-24 | オーエムディー デヴァイセス エルエルシー | 多層蛍光光学ディスクから3−dデータを読取る光学ピックアップ |
JP2002117550A (ja) * | 2000-03-24 | 2002-04-19 | Matsushita Electric Ind Co Ltd | 光学情報記録媒体とその記録再生方法および記録再生装置 |
JP2003085818A (ja) * | 2001-09-13 | 2003-03-20 | Toshiba Corp | 光ディスクドライブ及び光再生方法 |
JP2003091846A (ja) * | 2001-09-20 | 2003-03-28 | Ricoh Co Ltd | 光情報記録再生装置 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5289407A (en) | 1991-07-22 | 1994-02-22 | Cornell Research Foundation, Inc. | Method for three dimensional optical data storage and retrieval |
US5559784A (en) * | 1993-03-26 | 1996-09-24 | Fuji Xerox Co., Ltd. | Multi-layer optical information detection by two laser beam and optical multilayer recording medium |
JPH0983082A (ja) * | 1995-09-19 | 1997-03-28 | Hitachi Ltd | 半導体レーザ素子及び光ディスク装置、並びに光軸調整方法 |
JP2985866B2 (ja) | 1998-02-09 | 1999-12-06 | 日本電気株式会社 | 光ディスク装置及び光ディスク媒体 |
JPH11232677A (ja) | 1998-02-18 | 1999-08-27 | Fujitsu Ltd | 光ディスク装置 |
EP0984440A3 (en) * | 1998-09-04 | 2000-05-24 | Matsushita Electric Industrial Co., Ltd. | Aberration detection device and optical information recording and reproducing apparatus |
EP1087385B1 (en) * | 1999-03-15 | 2009-03-04 | Panasonic Corporation | Light converging element, method of recording and reproducing information and optical head |
KR100716938B1 (ko) * | 1999-08-09 | 2007-05-10 | 삼성전자주식회사 | 광픽업장치 |
US6754143B2 (en) | 2000-03-24 | 2004-06-22 | Matsushita Electric Industrial Co., Ltd. | Optical information recording medium, and method and apparatus for recording/reproducing information thereon |
KR100335446B1 (ko) * | 2000-08-08 | 2002-05-04 | 윤종용 | 수차 보정소자 및 이를 채용한 광픽업장치 |
JP2003016680A (ja) | 2001-07-02 | 2003-01-17 | Nec Corp | 波形歪み検出回路を備えた光ディスク記録再生装置 |
JP2003077158A (ja) | 2001-09-03 | 2003-03-14 | Sanyo Electric Co Ltd | 光記録再生装置およびチルトエラー信号生成方法 |
JP2004086966A (ja) * | 2002-08-26 | 2004-03-18 | Optware:Kk | 光情報再生装置および光情報記録再生装置 |
JP4505516B2 (ja) | 2003-03-19 | 2010-07-21 | 株式会社リコー | 画像処理装置、画像処理プログラム及び記録媒体 |
-
2004
- 2004-12-13 WO PCT/JP2004/018578 patent/WO2005064603A1/ja active Application Filing
- 2004-12-13 US US10/560,810 patent/US7903531B2/en not_active Expired - Fee Related
- 2004-12-13 CN CNB2004800182729A patent/CN100403415C/zh not_active Expired - Fee Related
- 2004-12-13 JP JP2005516560A patent/JP4427512B2/ja not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04366428A (ja) * | 1991-06-13 | 1992-12-18 | Toshiba Corp | 光ヘッドおよび光情報記録装置 |
JPH07272299A (ja) * | 1994-03-31 | 1995-10-20 | Nippon Columbia Co Ltd | 光ディスクの傾き検出方法および傾き検出機能を有する光学ヘッド |
JPH0845080A (ja) * | 1994-07-27 | 1996-02-16 | Sony Corp | 光ディスク及びクロストーク検出装置 |
JP2001505701A (ja) * | 1996-12-05 | 2001-04-24 | オーエムディー デヴァイセス エルエルシー | 多層蛍光光学ディスクから3−dデータを読取る光学ピックアップ |
JP2000076678A (ja) * | 1998-08-27 | 2000-03-14 | Pioneer Electronic Corp | 光ピックアップ装置 |
JP2002117550A (ja) * | 2000-03-24 | 2002-04-19 | Matsushita Electric Ind Co Ltd | 光学情報記録媒体とその記録再生方法および記録再生装置 |
JP2003085818A (ja) * | 2001-09-13 | 2003-03-20 | Toshiba Corp | 光ディスクドライブ及び光再生方法 |
JP2003091846A (ja) * | 2001-09-20 | 2003-03-28 | Ricoh Co Ltd | 光情報記録再生装置 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008097753A (ja) * | 2006-10-13 | 2008-04-24 | Sony Corp | 光ディスク装置及び焦点位置制御方法 |
JP2008097754A (ja) * | 2006-10-13 | 2008-04-24 | Sony Corp | 光ディスク装置、焦点位置制御方法及び体積型記録媒体 |
WO2011151909A1 (ja) * | 2010-06-03 | 2011-12-08 | パイオニア株式会社 | チルト補正方法及び装置、光ピックアップ並びに情報記録再生装置 |
JPWO2011151909A1 (ja) * | 2010-06-03 | 2013-07-25 | パイオニア株式会社 | チルト補正方法及び装置、光ピックアップ並びに情報記録再生装置 |
WO2013005378A1 (ja) * | 2011-07-07 | 2013-01-10 | パナソニック株式会社 | 光記録媒体およびその製造方法 |
Also Published As
Publication number | Publication date |
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US20060158974A1 (en) | 2006-07-20 |
US7903531B2 (en) | 2011-03-08 |
JP4427512B2 (ja) | 2010-03-10 |
CN100403415C (zh) | 2008-07-16 |
CN1813293A (zh) | 2006-08-02 |
JPWO2005064603A1 (ja) | 2007-07-19 |
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