CN101051211A - Optical information reproducing apparatus and optical information reproducing method using the same - Google Patents
Optical information reproducing apparatus and optical information reproducing method using the same Download PDFInfo
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- CN101051211A CN101051211A CNA2007100891862A CN200710089186A CN101051211A CN 101051211 A CN101051211 A CN 101051211A CN A2007100891862 A CNA2007100891862 A CN A2007100891862A CN 200710089186 A CN200710089186 A CN 200710089186A CN 101051211 A CN101051211 A CN 101051211A
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- 239000011159 matrix material Substances 0.000 description 2
- 230000001915 proofreading effect Effects 0.000 description 2
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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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
- G03H1/2645—Multiplexing processes, e.g. aperture, shift, or wavefront multiplexing
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
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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
- G11B7/1395—Beam splitters or combiners
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Abstract
An optical information reproducing apparatus and an optical information reproducing method using the same are provided. The optical information reproducing apparatus includes: a light source; a beam splitter which splits a beam emitted from the light source into a reference beam and a temporary beam; a temporary beam splitter which splits the temporary beam into a pair of assistant beams; an incident optical system which inputs the reference beam and the assistant beams to a recording medium in which optical information is recorded; a reproduction beam detector which detects reproduction beams reproduced in response to the reference beam, sets the position of the reproduction beam having the largest light intensity as a reference position, and sets a signal region on the basis of the reference beam; and an assistant beam detector which compares the light intensity of the assistant beams incident on the signal region with each other and sets an incident angle of the reference beam. Accordingly, it is possible to detect a tilt error and to correct the tilt error at the time of reproducing data from the recording medium.
Description
Technical field
Embodiments of the invention relate to optical information reproducing apparatus, more particularly, relate to a kind of optical information reproducing apparatus and optical information reproduction method that can utilize reference beam and a pair of auxiliary beam to detect the droop error that droop error and correct detection arrive.
Background technology
As optical data processing unit, known have digital versatile disc (DVD), high definition DVD (HD-DVD), Blu-ray disc (BD), near field optic signal conditioning package and a holographic optics signal conditioning package.
The holographic optics signal conditioning package is by being come record data to the recording medium irradiation by the signal beams of optical modulation and the reference beam that is used for formation interference figure on described recording medium in cross one another mode.
The holographic optics signal conditioning package comes the data of reproducing recorded by following steps: only to recording medium irradiation reference beam; By utilizing detecting device to detect reconstruction beam from recording medium reproducing; And handle detected reconstruction beam.
The holographic optics signal conditioning package can by utilize various multiplexing methods according to three dimensional constitution at the same position place of optical data recording medium record data repeatedly.Therefore, can improve the memory capacity of the limited optical data recording medium of area significantly.The example of multiplexing method can comprise angular multiplexed method, phase code multiplexing method, wavelength multiplexing method, divide dimension (fractal) multiplexing method, displacement multiplexing method and rotation (peristrophic) multiplexing method.
Optical information can not only be stored in a position on the storage medium.That is to say that various optical information can be recorded in each position on the recording medium.Thereby, recording medium should be moved to the position that is used for reproduction optical information is stored in recording medium with reproduction optical information.For example, when recording medium is dish-type, reproduction optical information when dish rotates.
A kind of method of movable recording media has been described in the U.S. Patent No. 5,978,112 that is entitled as " NON-VOLATILE READOUT OF SHIFTMULTIPLEXED HOLOGRAMS " that people such as Psaltis submit to.
This U.S. Patent Publication a kind of structure and method of tilted recording medium.That is to say,, make it possible to utilize that displacement is servo comes movable recording media according to the record position of this optical information on recording medium when recording optical information.
As described in this United States Patent (USP), move continuously and must make mechanical movement for example rotation and translation motion with reproduction optical recording of information medium.Thereby, change the inclination angle of reference beam and recording medium serially.
When adopting volume edogram as this United States Patent (USP), reference beam should incide on the bigger body holographic region of angular selectivity, to improve the reproduction efficient of reconstruction beam.
When the incident angle of the reference beam on inciding the recording medium that stores optical information is in the angular region of Prague (Brag), improved the reproduction efficient of the reconstruction beam that reproduces in response to reference beam.
Determine the incident angle of reference beam according to the inclination angle of recording medium.The diffraction efficiency that incides the reference beam on the recording medium depends on the incident angle of reference beam (that is the inclination angle of recording medium).When the inclination angle of foundation recording medium and the incident angle of the reference beam that changes when departing from the scope of Bragg angle, the reproduction efficient of reconstruction beam significantly reduces.
Therefore, when at the recording medium identifying recording layer or when the time, must detect whether occur droop error and necessary this droop error of proofreading and correct between reference beam and the recording medium from the recording medium reproducing data.
Summary of the invention
Embodiments of the invention are designed to address the above problem.The advantage of some aspect of the present invention be to provide a kind of can be by coming the inclination angle of detection record medium and the optical information reproducing apparatus and the optical information reproduction method of correct for tilt errors to recording medium input auxiliary beam when the reproduction optical information.
According to an aspect of the present invention, provide a kind of optical information reproducing apparatus, this optical information reproducing apparatus comprises: light source; Beam splitter, it will be divided into reference beam and interim light beam from the light beam of described light emitted; Interim beam splitter, it is divided into a pair of auxiliary beam with described interim light beam; Incident optical system, it imports described reference beam and described auxiliary beam to the recording medium that records optical information; The reconstruction beam detecting device, it detects the reconstruction beam that reproduces in response to described reference beam; And the auxiliary beam detecting device, it detects the light intensity by the auxiliary beam of optical information diffraction, to read the inclination angle of described recording medium.
According to a further aspect in the invention, provide a kind of optical information reproduction method, this optical information reproduction method may further comprise the steps: to the recording medium input reference beam and the auxiliary beam that store multiplexing optical information; Detection is measured the inclination angle of described recording medium by the auxiliary beam of optical information diffraction; The inclination angle that records and the setting value of described recording medium are compared; Determine the inclination angle of described recording medium; Based on the determined inclination angle of described recording medium, set the incident angle of described reference beam; And the incident angle of proofreading and correct described reference beam based on the incident angle that sets of described reference beam.
According to a further aspect in the invention, provide a kind of optical information reproduction method, this optical information reproduction method may further comprise the steps: to the recording medium input reference beam that stores multiplexing optical information; Scanning optical information in the described reference beam that tilts; Detect the optical information of launching largest light intensity in response to described reference beam according to the optical information that scans, and the position of launching the described optical information of largest light intensity is set to the reference position; Based on signalization zone, described reference position; And the incident angle of controlling described reference beam based on the optical information in the described signal area with respect to the position of described reference position.
According to a further aspect in the invention, provide a kind of optical information reproduction method, this optical information reproduction method may further comprise the steps: import a plurality of auxiliary beams to the recording medium that stores optical information; Detection is by the auxiliary beam of described recording medium diffraction; The setting value of detected auxiliary beam and auxiliary beam is compared; And the result inclination angle of calculating described recording medium based on the comparison.
Description of drawings
Fig. 1 has been the illustration figure of the structure of optical information reproducing apparatus according to an exemplary embodiment of the present invention.
Fig. 2 has been an illustration figure of the structure of the optical information recorder/transcriber of another exemplary embodiment according to the present invention, the light path when wherein schematically showing recording optical information.
Fig. 3 has been an illustration figure of the structure of the optical information recorder/transcriber of another exemplary embodiment according to the present invention, the light path when wherein schematically showing reproduction optical information.
Fig. 4 has been the illustration process flow diagram of optical information reproduction method according to an exemplary embodiment of the present invention.
Fig. 5 is the illustration process flow diagram of the light beam input step in the optical information reproduction method according to an exemplary embodiment of the present invention.
Fig. 6 and Fig. 7 are illustrations is used for the synoptic diagram of the light intensity-angle Selection curve of correct for tilt errors in optical information reproduction method according to an exemplary embodiment of the present invention.
Fig. 8 is the illustration process flow diagram handled of the detection in the optical information reproduction method according to an exemplary embodiment of the present invention.
Fig. 9 to Figure 10 be illustration according to an exemplary embodiment of the present invention the auxiliary beam in the optical information reproduction method detect the figure that handles.
Embodiment
Below, the optical information reproduction method that describes optical information reproducing apparatus, optical information recorder/transcriber with reference to the accompanying drawings in detail and utilize described device.
In the following description, the function of consideration element defines its title.Thereby, the title of element should be interpreted as qualification technology member, also can be called other titles in the art.
The example of optical information reproducing apparatus at first, is described with reference to Fig. 1.As shown in the figure, optical information reproducing apparatus 100 comprises light source 110, polarized light beam splitter 120, interim beam splitter 130, overlapping optical system 140, Focused Optical system 160 and sensing element 170.
The interim light beam A that polarized light beam splitter 120 will be divided into the reference beam R that is used for reproduction optical information and be used to generate the first auxiliary beam A1 and the second auxiliary beam A2 from light source 110 emitted light beams.Polarized light beam splitter 120 has the polarization beam splitting face 120a that has been used for partially and light beam L has been carried out beam splitting.Polarized light beam splitter 120a is used for the interim light beam of transmission (P light beam) A and reflected reference beam (S light beam) S.
Special light source regulating element 124 can be set, and this light source regulating element 124 is used to regulate the reference beam R and the first auxiliary beam A1 and the second auxiliary beam A2 that are gone out by polarized light beam splitter 120 beam splitting.Light source regulating element 124 can be provided as polaroid, sensitization wave filter or the like.Light source regulating element 124 is set to accurately regulate light intensity and the uniformity coefficient of reference beam R and the first auxiliary beam A1 and the second auxiliary beam A2, and this light source regulating element 124 is not set can be guaranteed in the characteristic of reference beam R and interim light beam A the time.
Can use non-polarized light beam beam splitter (not shown) to replace polarized light beam splitter 120.In this case, can use S polaroid and P polaroid to replace light source regulating element 124, S polaroid and P polaroid are respectively applied for reference beam R and the interim light beam A that will be gone out by the beam splitting of non-polarized light beam beam splitter institute and play inclined to one side be S light beam and P light beam.
The interim light beam A that interim beam splitter 130 is used for being gone out by polarized light beam splitter 120 beam splitting is divided into the first auxiliary beam A1 and the second auxiliary beam A2.Interim beam splitter 130 is arranged on the path that interim light beam A passes through.Interim beam splitter 130 can be provided as prism spectroscope, holographic spectroscope or the like.
On the light path of the reference beam R that is separated by polarized light beam splitter 120, also be provided with a plurality of catoptrons 126 that are used for reference beam R guiding overlapping optical system 140.Catoptron 126 is preferably the Galvano mirror of the light path that is used to regulate reference beam R.
Overlapping optical system 140 is used to be parallel to the optical axis ground overlapping first auxiliary beam A1 and the second auxiliary beam A2 and reference beam R.Overlapping optical system 140 comprises light beam overlapping device 142, refracting telescope 150 and condenser lens 146.
Light beam overlapping device 142 has the overlapping face 142a that is used for the transmission first auxiliary beam A1 and the second auxiliary beam A2 and reflected reference beam R.By the overlapping face 142a transmission first auxiliary beam A1 and the second auxiliary beam A2 and reflected reference beam R, thereby make light beam overlap.
The reference beam R that overlaps by light beam overlapping device 142 and the first auxiliary beam A1 and the second auxiliary beam A2 incide Focused Optical system 160 by refracting telescope 150.Refracting telescope 150 is preferably formed by the Galvano mirror.
Focused Optical system 160 is used for the reference beam R that will overlap and the first auxiliary beam A1 and the second auxiliary beam A2 and is input to recording medium D.Focused Optical system 160 comprises a plurality of condenser lenses 162.The light path of passing through Focused Optical system 160 of the first auxiliary beam A1 and the second auxiliary beam A2 preferably has equal length.Inciding the first auxiliary beam A1 on the recording medium D and the light intensity of the second auxiliary beam A2 should be equal to each other or be equal to each other in error range as much as possible.
Reading optical beam beam splitter 172 is used for the reconstruction beam that reproduces during by recording medium D at the first auxiliary beam A1 and the second auxiliary beam A2 and reference beam R is carried out beam splitting.Reading optical beam beam splitter 172 is transmitted to auxiliary beam detecting device 176 with the first auxiliary beam A1 and the second auxiliary beam A2, and reference beam R is reflexed to reconstruction beam detecting device 174.
Reconstruction beam detecting device 174 is used to detect the reconstruction beam that reproduces from recording medium D in response to reference beam R.Reconstruction beam detecting device 174 can adopt the image sensing device that has such as the pel array of CCD (charge-coupled image sensor) and CMOS (complementary metal oxide semiconductor (CMOS)) device.
Auxiliary beam detecting device 176 detects when utilizing reference beam reproduction optical information the together first auxiliary beam A1 of diffraction and intensity and the position of the second auxiliary beam A2 with reference beam R.Auxiliary beam detecting device 176 is determined the droop error of reference beam R and recording medium D based on testing result.Auxiliary beam detecting device 176 adopt be arranged as with the corresponding a plurality of photodiode P1 of moving area of the first auxiliary beam A1 by recording medium D and the second auxiliary beam A2 ... and Pn (referring to Fig. 9 and Figure 10).
Photodiode P1 ... and the arrangement of Pn should be longer than the total length apart from d and the first auxiliary beam A1 and the displacement of the second auxiliary beam A2 when tilting between the incidence point of the first auxiliary beam A1 and the second auxiliary beam A2.Capable of being combined and arrange at least several to dozens of photodiodes P1 ... and Pn.Can adopt CCD or cmos device as auxiliary beam detecting device 176.Can be suitable for embodiment ground and revise and adopt any part.
The inclination angle of the recording medium D that is used for determining that the first auxiliary beam A1 and the second auxiliary beam A2 pass through by the intensity of the auxiliary beam detecting device 176 detected first auxiliary beam A1 and the second auxiliary beam A2 and position.
When the first auxiliary beam A1 and the second auxiliary beam A2 together are refracted with reference beam R, can measure the light intensity of the first auxiliary beam A1 and the second auxiliary beam A2 and the inclination angle that recording medium D is determined in the position by recording medium D the time.
Below, with the reproduction that is described in briefly in the optical information reproducing apparatus optical information.
110 emission light beam L come reproduction optical information from light source.Is reference beam R and interim light beam A by polarized light beam splitter 120 with institute's emitted light beams L beam splitting.Regulate the reference beam R of institute's beam splitting and the characteristic (for example, intensity, uniformity coefficient and polarizability) of interim light beam A by light source regulating element 124.Is the first auxiliary beam A1 and the second auxiliary beam A2 by interim beam splitter 130 with the interim light beam A beam splitting through regulating.
The first auxiliary beam A1 and the second auxiliary beam A2 of institute's beam splitting incide on the overlapping optical system 140, to overlap with reference beam R.Inciding the first auxiliary beam A1 on the overlapping optical system 140 and the second auxiliary beam A2 and reference beam R overlaps to be parallel to optical axis and to propagate into refracting telescope 150.Incide on the recording medium D with reference beam R and with the first auxiliary beam A1 and the second auxiliary beam A2 that reference beam overlaps mutually by refracting telescope 150.
Incide reference beam R on the recording medium D and be formed on interference figure refraction on the recording medium D, thereby generate reconstruction beam.Read reconstruction beam by reconstruction beam detecting device 174.
The first auxiliary beam A1 and the second auxiliary beam A2 incide the same position place on the recording medium D of reference beam R incident.At this moment, reference beam R can be with the first auxiliary beam A1 and the second together incident of auxiliary beam A2, perhaps only the incident first auxiliary beam A1 and the second auxiliary beam A2.First auxiliary beam A1 of incident and the intensity of the second auxiliary beam A2 should be equal to each other or be equal to each other in error range as much as possible.
The first auxiliary beam A1 and the second auxiliary beam A2 that incide on the recording medium D detect by recording medium D and by auxiliary beam detecting device 176.Auxiliary beam detecting device 176 detects intensity and the position of the detected first auxiliary beam A1 and the second auxiliary beam A2.
The data that are used as the inclination angle of the incident angle of reading reference beam R and recording medium D by the intensity of the auxiliary beam detecting device 176 detected first auxiliary beam A1 and the second auxiliary beam A2 and position.
The example of optical information recorder/transcriber is described with reference to Fig. 2 and Fig. 3 below.Optical information recorder/transcriber 200 has the structure of adding the optical system that is used for generating the signal beams S of recording optical information to above-mentioned optical information reproducing apparatus 100.The structure identical with optical information reproducing apparatus 100 will be not described in detail.
As shown in Figures 2 and 3, optical information recorder/transcriber 200 comprises light source 210, non-polarized light beam beam splitter 220a, polarized light beam splitter 220b, interim beam splitter 230a, overlapping optical system 240, refracting telescope 250, Focused Optical system 260 and sensing element 270.
Non-polarized light beam beam splitter 220a is used for carrying out beam splitting from light source 210 emitted light beams L to form signal beams S and reference beam R.Light beams was risen partially to form signal beams S by light source regulating element 222a in a branch of minute.Another light beam of institute's beam splitting incides that polarized light beam splitter 220b goes up and is reference beam R and interim light beam A by beam splitting.
To be risen by the light beams that the beam splitting of non-polarized light beam beam splitter 220a institute goes out by light source regulating element 222a is that the P light beam is to form signal beams S partially.The light path of signal beams S is provided with optical gate (shutter) 224a, spatial light modulator 228 and fourier transform lens 229.
The light path of optical gate 224a shutoff signal light beam S the time from recording medium D reproduction optical information.Spatial light modulator 228 with data load to signal beams S.Fourier transform lens 229 comes figure signal light beam S by Fourier transform, and will be input to recording medium D through the signal beams S of conversion.
Spatial light modulator 228 can adopt TFT LC (film transistor type liquid crystal) device of representing active-matrix device, STN LC (super-twist nematic liquid crystal) device, Ferro LC device, PDLC (Polymer Dispersed Liquid Crystal) device or the plasma addressed LC device of representing passive matrix device.
To describe the record of optical information recorder/transcriber below and reproduce operation.
The operation of recording optical information is at first described.From light source 210 emission light beam L.Is a pair of light beam that is used to generate signal beams S and reference beam R by non-polarized light beam beam splitter 220a with institute's emitted light beams L beam splitting.By light source regulating element 222a one light beams of institute's beam splitting is risen and to be the P light beam partially, and be converted into signal beams S.
At signal beams S by in the spatial light modulator 228, utilize spatial light modulator 228 with data load to signal beams S.The signal beams S that is loaded with data on it incides on the recording medium by fourier transform lens 229.
Another light beam by non-polarized light beam beam splitter 220a beam splitting incides on the polarized light beam splitter 220b, and is reference beam R and interim light beam A by beam splitting.Interim light beam A need not to be used for recording optical information, thus by optical gate 224b cross-section (intersected).
The reference beam R that is gone out by polarized light beam splitter 220b beam splitting incides on the overlapping optical system 240 by a plurality of catoptrons 226.The reference beam R that incides on the overlapping optical system 240 incides on the recording medium D by refracting telescope 250 and Focused Optical system 260.
On recording medium D, form the holographic interference pattern by signal beams S and the reference beam R that incides on the recording medium D.This holographic interference pattern is the data that are used to reproduce recording medium D.
The operation of reproduction optical information will be described below.From light source 210 emission light beam L.Is a pair of light beam that is used to generate signal beams S and reference beam R by non-polarized light beam beam splitter 220a with institute's emitted light beams L beam splitting.Come the cross-section light beam that is used to generate signal beams S by optical gate 224a.
Another light beam that is gone out by non-polarized light beam beam splitter 220a beam splitting incides on the polarized light beam splitter 220b, and is reference beam R and interim light beam A by beam splitting.Reference beam R incides on the overlapping optical system 240 by a plurality of catoptrons 226.
Is the first auxiliary beam A1 and the second auxiliary beam A2 by auxiliary beam light splitting optical system 230 with interim light beam A beam splitting.The first auxiliary beam A1 and the second auxiliary beam A2 incide on the overlapping optical system 240 and with reference beam R and overlap mutually.The first auxiliary beam A1 that will overlap by refracting telescope 250 and the second auxiliary beam A2 and reference beam R guiding Focused Optical system 260.
The reference beam R and the first auxiliary beam A1 and the second auxiliary beam A2 incide on the recording medium D by Focused Optical system 260.Utilization is formed on the reference beam R that the interference figure on the recording medium D will incide on the recording medium D and is converted to reconstruction beam.The reconstruction beam by recording medium D and the first auxiliary beam A1 and the second auxiliary beam A2 incide and read on the optical system 270.
It is separated from each other to incide the reconstruction beam read on the optical system 270 and the first auxiliary beam A1 and the second auxiliary beam A2 by reading optical beam beam splitter 272.Read reconstruction beam by reconstruction beam detecting device 274, read the first auxiliary beam A1 and the second auxiliary beam A2 by auxiliary beam detecting device 276.
Employing is by the intensity of the auxiliary beam detecting device 276 detected first auxiliary beam A1 and the second auxiliary beam A2 and the position data as the inclination angle of incident angle of reading reference beam R and recording medium D.
Use description in above-mentioned optical information reproducing apparatus and optical information recorder/transcriber, proofread and correct the method for the droop error of recording medium below.Come indicating member with the Reference numeral in the optical information reproducing apparatus.These members also can be indicated by the Reference numeral in optical information recorder/transcriber.Alternatively, they can be included in the modified example of the present invention.
With reference to Fig. 4 optical information reproduction method according to exemplary embodiment is described.
As shown in Figure 4, in optical information reproduction method, reference beam R incides on the recording medium D.The first auxiliary beam A1 and the second auxiliary beam A2 can be with the reference beam R incidents of inciding on the recording medium D (light beam input step (S110)).
On recording medium D, form the holographic interference pattern to produce the diffraction of light beam according to angular multiplexed method.The first auxiliary beam A1 and the second auxiliary beam A2 incide the same position place on the recording medium D.First auxiliary beam A1 of incident and the intensity of the second auxiliary beam A2 should be equal to each other or be equal to each other in error range as much as possible.
Incide the first auxiliary beam A1 on the recording medium D and the second auxiliary beam A2 in by recording medium D by the interference figure diffraction that is formed on the recording medium D.Detect first diffracted auxiliary beam A1 and the second auxiliary beam A2 (detecting step (S120)) by auxiliary beam detecting device 176.When detecting the first auxiliary beam A1 and the second auxiliary beam A2, measure light intensity and the position of the first auxiliary beam A1 and the second auxiliary beam A2.Utilization be arranged on a plurality of photodiode P1 on the auxiliary beam detecting device 176 ... and Pn comes sensing first auxiliary beam A1 and the second auxiliary beam A2 (referring to Fig. 9 and Figure 10).
When reading the first auxiliary beam A1 and the second auxiliary beam A2 fully, the sense information of the first auxiliary beam A1 and the second auxiliary beam A2 and the previous set information of the first auxiliary beam A1 and the second auxiliary beam A2 are compared, to determine that whether therebetween difference is less than specification error value (comparison step (S130)).The specification error value is to satisfy the value of optimum Working, and can be in advance the duty that is associated with difference except that the specification error value be stored in the look-up table.
When difference during, carry out by reference beam R is input to recording medium 110 and the reproduction optical information processing less than the specification error value.When difference during, judge that the incident angle of the reference beam R that is determined by the inclination angle of recording medium D is not " Bragg angle ", the inclination angle of recording medium D incorrect (determining step (S140)) thus greater than the specification error value.
By repeatedly the first auxiliary beam A1 and the second auxiliary beam A2 being input to same position and repeatedly detected value and specification error value being compared, can determine the inclination angle of storage medium D more accurately.
Compare by detected value and setting value, be provided with the incident angle (incident angle is provided with step (S150)) of reference beam R the first auxiliary beam A1 and the second auxiliary beam A2.By will with reference beam R together the first auxiliary beam A1 of incident and the light intensity of the second auxiliary beam A2 compare, can calculate the incident angle of reference beam R.By the comparison of the first auxiliary beam A1 and the second auxiliary beam A2, can determine the incident angle of reference beam R based on the position that occurs little difference or minimal difference between the first auxiliary beam A1 and the second auxiliary beam A2.
The droop error of recording medium D is proofreaied and correct to form the default incident angle (aligning step (S160)) of reference beam R.Can be by the inclination angle of recording medium D being proofreaied and correct or the incident angle of reference beam R is proofreaied and correct the correction of carrying out the droop error of recording medium D.
Describe the light beam input step (S110) of optical information reproduction method in detail with reference to Fig. 5.
In light beam input step (S110), scan the optical information (scanning step (S112)) that is stored in the position of reference beam R incident according to angular multiplexed method to the reference beam R (the perhaps first auxiliary beam A1 and the second auxiliary beam A2) on the recording medium D by oblique incidence.
The reference beam R and the first auxiliary beam A1 that suppose to incide on the recording medium D have identical light intensity with the second auxiliary beam A2." θ " the expression first auxiliary beam A1 and the second auxiliary beam A2 incide the angle on the recording medium D.
Light intensity-angle Selection the curve of the optical information that scans has been shown among Fig. 6 and Fig. 7.
The synoptic diagram of light intensity-angle Selection curve that Fig. 6 is an illustration when not having the multiplexing optical information that is stored in the recording medium.As shown in the figure, when the light intensity with the first auxiliary beam A1 of equal angular incident and the second auxiliary beam A2 is positioned at same position place on two slopes of peak curve, the inclination angle of recording medium D is formed the feasible diffraction efficiency maximum that incides the reference beam R on the recording medium D, this means that the incident angle of the reference beam R that is determined by the inclination angle of recording medium D is positioned at " Bragg angle ".
The synoptic diagram of light intensity-angle Selection curve that Fig. 7 is an illustration when the multiplexing optical information that is stored in the recording medium.As shown in the figure, when locating with predetermined difference value t with the light intensity of the first auxiliary beam A1 of equal angular incident and the second auxiliary beam A2, the incident angle of the reference beam R that is determined by the inclination angle of recording medium D is not positioned at " Bragg angle " to be located, and this means that the diffraction efficiency of reference beam R reduces.
Be described below with reference to Fig. 7.Be stored in optical information (scanning step (S112)) among the recording medium D by utilizing angular multiplexed method to scan with angular multiplexed method.The position that has the optical information of largest light intensity in the optical information that scans is set to reference position Rmax (reference position is provided with step (S114)).
Adopt reference position Rmax that the optical information that is used as benchmark in the optical information that scans is set.Reference position Rmax is as the benchmark that reproduces other optical information in angular multiplexed information.
After the reference position Rmax of optical information is set, the signal area 1 (signal area is provided with step (S116)) of reconstruction beam is set based on reference position Rmax.Signal area 1 is used for easily moving between many angular multiplexed optical information by getting rid of at the noise that generates between many angular multiplexed optical information according to reference position Rmax.
Signal area 1 can be determined by the steady state value k that before is provided with at reference position Rmax.Steady state value k is the value between 0 and 1, and the position of the reconstruction beam in the signal area 1 is lower than reference position Rmax all the time.Steady state value k can change according to device state being set, and can be set to according to the average intensity of the optical information that scans variable.
When reference position Rmax is set as mentioned above, can come to determine inversely reference position Rmax by largest light intensity A1max and the A2max that utilizes the first auxiliary beam A1 and the second auxiliary beam A2 corresponding to reference position Rmax.
Owing to have constant clearance between the reference position A2max of the reference position A1max of first auxiliary beam and second auxiliary beam, so the reference position A1max that can be by reading first auxiliary beam and the reference position A2max of second auxiliary beam calculate reference position Rmax inversely.
When the reference position A1max that utilizes first auxiliary beam and second auxiliary beam and A2max determine reference position Rmax, satisfy R＜k*Rmax and A1＜k*A1max and A2＜k*A2max simultaneously and satisfy Rmax＞A1max and the position of Rmax＞A2max and A1max=A2max is set to reference position Rmax.
Reference position Rmax reverse determined to can be used to when the reproduction optical information to find out the optical information of reproduction when reference beam R departs from particular optical information owing to various errors or external action.
In this manner, finished the light beam input step (S110) that reference beam R is input to signal area 1.
Describe the detection step (S120) of optical information reproduction method below in detail with reference to Fig. 8 and Fig. 9.
Detect the first auxiliary beam A1 and the second auxiliary beam A2 by auxiliary beam detecting device 176 by recording medium D.Auxiliary beam detecting device 176 comprise a plurality of photodiode P1 ... and Pn, and by with these photodiodes P1 ... and Pn be divided into a plurality of detecting units (U1 ... and Un) detect the first auxiliary beam A1 and the second auxiliary beam A2 (detecting unit partiting step (S122); Referring to Fig. 9 and Figure 10).
Detecting unit U1 ... and Un detects the first auxiliary beam A1 and the second auxiliary beam A2 by recording medium D, thus from detecting unit U1 ... and find out detecting unit among the Un and have time peaked detecting unit U2 with maximum detected value.After finding out detecting unit and having time peaked detecting unit U2, the detected value of detecting unit U1 and U2 is compared (detected value comparison step (S124)) mutually with maximum detected value.
Incide situation on two photodiode Pn and the Pn+1 owing to exist among the first auxiliary beam A1 and the second auxiliary beam A2 each all to incide situation and auxiliary beam A1 or an A2 on the photodiode Pn exactly in the mode that overlaps, so need be provided with to detecting unit Un.
May occur as shown in Figure 9 detecting each situation among the first auxiliary beam A1 and the second auxiliary beam A2, and detect one or more situation among auxiliary beam A1 and the A2 according to the mode that overlaps by a plurality of photodiode Pn and Pn+1 by a photodiode Pn.
When detecting one of the first auxiliary beam A1 and second auxiliary beam A2 by a photodiode, the photodiode P1 from be arranged in auxiliary beam detecting device 176 ... and select to have the photodiode (hereinafter being called " P2 ") of maximum detected value among the Pn.Photodiode P2 and two photodiodes that are positioned at the both sides of photodiode P2 are set to the first detecting unit U1, and photodiode is divided into detecting unit U2 by 3 adjacent photodiode are combined ... and Un.
Calculate the light intensity of detecting unit U1 and U2, find out detecting unit U1 with largest light intensity and detecting unit U2 then with inferior largest light intensity.Then, the light intensity of the first detecting unit U1 is compared with the light intensity of the second detecting unit U2.
As shown in figure 10, when auxiliary beam A1 and A2 with the mode that overlaps focus on one or more photodiode P1 ... and Pn is when going up, by according to auxiliary beam A1 and A2 are focused on mode identical on the photodiode with photodiode P1 ... and Pn be divided into detecting unit U2 ... and Un, can measure the light intensity of the first auxiliary beam A1 and the second auxiliary beam A2.
Measurement by between the auxiliary beam detecting device 176 detected first auxiliary beam A1 and the second auxiliary beam A2 apart from d.Detect the photodiode of largest light intensity and detect distance between the photodiode of time largest light intensity by calculating, can obtain the distance between the first auxiliary beam A1 and the second auxiliary beam A2.Can be than the detection distance between the definite more accurately first auxiliary beam A1 of the predeterminable range between the first auxiliary beam A1 and the second auxiliary beam A2 and the second auxiliary beam A2.
When the inclination angle of recording medium D is too big, because one of the first auxiliary beam A1 and second auxiliary beam A2 may depart from the zone of auxiliary beam detecting device 176, so will measure the distance between the first auxiliary beam A1 and the second auxiliary beam A2.In this case, auxiliary beam detecting device 176 can detect an auxiliary beam and by auxiliary beam detecting device 176 detected another light beams (for example, the noise light beam that generates when the diffraction) as auxiliary beam.
In this manner, by utilizing light beam, can calculate the incident angle of the reference beam R that incides on the recording medium D or the inclination angle of the recording medium D that reference beam R is incided in response to reference beam R and the first auxiliary beam A1 and second auxiliary beam A2 reproduction.
The incident angle of reference beam R or the inclination angle of recording medium D are controlled in the inclination angle that calculates of the recording medium D that can be incided based on the incident angle that calculates that incides the reference beam R on the recording medium D or reference beam R.
As previously mentioned, in optical information reproducing apparatus, optical information recorder/transcriber and optical information reproduction method according to an exemplary embodiment of the present invention, by make reference beam and a pair of auxiliary beam by recording medium, detect reference beam by recording medium and auxiliary beam with the inclination angle of determining recording medium and determine whether to occur droop error, can come correct for tilt errors.
Claims (19)
1, a kind of optical information reproducing apparatus, this optical information reproducing apparatus comprises:
Light source;
Beam splitter, it will be reference beam and interim light beam from the light beam beam splitting of described light emitted;
Interim beam splitter, it is a pair of auxiliary beam with described interim light beam beam splitting;
Incident optical system, it imports described reference beam and described auxiliary beam to the recording medium that records optical information;
The reconstruction beam detecting device, it detects the reconstruction beam that reproduces in response to described reference beam; And
The auxiliary beam detecting device, it detects the light intensity by the described auxiliary beam of described optical information diffraction, to read the inclination angle of described recording medium.
2, optical information reproducing apparatus according to claim 1, wherein, described reconstruction beam detecting device detects the position that in response to described the reference beam reconstruction beam that reproduces, described reconstruction beam have largest light intensity and is set to the reference position and comes the signalization zone based on described reference position.
3, optical information reproducing apparatus according to claim 2, wherein, the light intensity that described auxiliary beam detecting device will incide the described a pair of auxiliary beam on the described signal area compares mutually, and the incident angle of described reference beam is set.
4, optical information reproducing apparatus according to claim 3 wherein, is arranged so that with the incident angle of described reference beam the light intensity difference between the described auxiliary beam reduces.
5, optical information reproducing apparatus according to claim 1, wherein, described auxiliary beam becomes an inclination angle to incide diverse location place on the described recording medium with respect to described reference beam.
6, optical information reproducing apparatus according to claim 5, wherein, the optical information that is recorded in the described recording medium is the holographic interference pattern, and described auxiliary beam incides the position of described reference beam incident, and together diffracted with described reference beam.
7, optical information reproducing apparatus according to claim 1, wherein, described reference beam and described auxiliary beam incide the same position place on the described recording medium, and
Wherein, described optical information reproducing apparatus also comprises beam splitter, and this beam splitter will separate with the described auxiliary beam that passes through described recording medium from the described reconstruction beam of described recording medium reproducing.
8, optical information reproducing apparatus according to claim 7, wherein, described auxiliary beam detecting device comprises a plurality of photodiodes of arranging along the vergence direction of the described reference beam of control.
9, optical information reproducing apparatus according to claim 8, wherein, the spread length of described photodiode is greater than the distance between the incoming position of described auxiliary beam with at the total length of control displacement of the incoming position of described reference beam during described inclination angle.
10, a kind of optical information reproduction method, this optical information reproduction method may further comprise the steps:
To the recording medium input reference beam and the auxiliary beam that store multiplexing optical information;
Detection is measured the inclination angle of described recording medium by the auxiliary beam of optical information diffraction;
The measured inclination angle and the setting value of described recording medium are compared;
Determine the inclination angle of described recording medium;
According to the determined inclination angle of described recording medium, the incident angle of described reference beam is set; And,
Proofread and correct the incident angle of described reference beam according to the incident angle that sets of described reference beam.
11, optical information reproduction method according to claim 10, wherein, the described step of input reference beam and auxiliary beam may further comprise the steps:
Utilize described reference beam to scan the optical information of described recording medium;
The reference position of launching largest light intensity in response to described reference beam is set according to the optical information that scans; And
The signal area of launching predetermined light intensity in response to described reference beam is set according to described reference position.
12, optical information reproduction method according to claim 10, wherein, the described step that detects auxiliary beam may further comprise the steps:
Detect a plurality of auxiliary beams;
The auxiliary beam that will have maximum detected value compares mutually with the auxiliary beam with time maximum detected value; And
The result calculates the inclination angle of described recording medium based on the comparison.
13, optical information reproduction method according to claim 12, wherein, the described step of the incident angle of calibration reference light beam comprises the steps: the incident angle of described reference beam is arranged so that the light intensity difference between the auxiliary beam that is compared reduces.
14, a kind of optical information reproduction method, this optical information reproduction method may further comprise the steps:
To the recording medium input reference beam that stores multiplexing optical information;
In the described reference beam that tilts, scan described optical information;
Detect the optical information of launching largest light intensity in response to described reference beam according to the optical information that scans, and the position of launching the described optical information of largest light intensity is set to the reference position;
According to signalization zone, described reference position; And
Control the incident angle of described reference beam with respect to the position of described reference position according to the optical information in the described signal area.
15, optical information reproduction method according to claim 14, wherein, the described step of input reference beam may further comprise the steps:
A plurality of auxiliary beams are input to position identical with described reference beam in the described signal area;
Detect the light intensity of described auxiliary beam; And
Compare the incident angle of calculating described reference beam mutually by light intensity with described auxiliary beam.
16, optical information reproduction method according to claim 14, wherein, the step of calculating the incident angle of reference beam comprises the steps: to compare mutually by auxiliary beam that will have maximum detected value and the auxiliary beam with time maximum detected value, calculates the incident angle of described reference beam.
17, a kind of optical information reproduction method, this optical information reproduction method may further comprise the steps:
Import a plurality of auxiliary beams to the recording medium that stores optical information;
Detection is by the auxiliary beam of described recording medium diffraction;
The setting value of detected auxiliary beam and described auxiliary beam is compared; And
Calculate the inclination angle of described recording medium according to comparative result.
18, optical information reproduction method according to claim 17, wherein, the step of more detected auxiliary beam comprises the steps: that the auxiliary beam that will have maximum detected value compares mutually with the auxiliary beam with time maximum detected value.
19, optical information reproduction method according to claim 17, wherein, the described step of importing a plurality of auxiliary beams comprises the steps:
The reference beam that is used for reproduction optical information to the described recording medium input that stores optical information;
In the described reference beam that tilts, scan described optical information;
Detect according to the optical information that scans and to launch the optical information of largest light intensity, and the position of launching the described optical information of largest light intensity is set to the reference position in response to described reference beam; And
Based on signalization zone, described reference position.
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| KR1020060031300 | 2006-04-06 | ||
| KR1020060031299A KR100727779B1 (en) | 2006-04-06 | 2006-04-06 | Optical information reproducing apparatus, optical information recoding/reproducing apparatus and method for reproducing of optical information by using the same |
| KR1020060031299 | 2006-04-06 |
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| CN101051211A true CN101051211A (en) | 2007-10-10 |
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| KR (1) | KR100727779B1 (en) |
| CN (1) | CN100504663C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103514909A (en) * | 2012-06-19 | 2014-01-15 | 日立视听媒体股份有限公司 | Holographic optical pickup device, optical information recording and reproducing device, and method of reproducing optical information |
| CN110989313A (en) * | 2019-11-18 | 2020-04-10 | 中国科学技术大学 | Holographic microscopic imaging device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5487057B2 (en) * | 2010-09-01 | 2014-05-07 | 日立コンシューマエレクトロニクス株式会社 | Playback apparatus and playback method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100536721B1 (en) * | 2003-12-15 | 2005-12-14 | 주식회사 대우일렉트로닉스 | Apparatus for controlling disk tilt in a holographic rom system |
| KR100600277B1 (en) * | 2004-03-08 | 2006-07-13 | 주식회사 대우일렉트로닉스 | Servo device of the holographic rom disk |
| KR100600299B1 (en) * | 2004-03-13 | 2006-07-13 | 주식회사 대우일렉트로닉스 | Combo type holographic regenerating apparatus |
-
2006
- 2006-04-06 KR KR1020060031299A patent/KR100727779B1/en not_active IP Right Cessation
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103514909A (en) * | 2012-06-19 | 2014-01-15 | 日立视听媒体股份有限公司 | Holographic optical pickup device, optical information recording and reproducing device, and method of reproducing optical information |
| CN103514909B (en) * | 2012-06-19 | 2017-04-12 | 日立视听媒体股份有限公司 | Holographic optical pickup device and optical information recording and reproducing device |
| CN110989313A (en) * | 2019-11-18 | 2020-04-10 | 中国科学技术大学 | Holographic microscopic imaging device |
| CN110989313B (en) * | 2019-11-18 | 2021-10-01 | 中国科学技术大学 | Holographic microscopic imaging device |
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| CN100504663C (en) | 2009-06-24 |
| KR100727779B1 (en) | 2007-06-14 |
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