WO2004051635A1 - 光ヘッド装置、光記録装置及び光記録方法 - Google Patents
光ヘッド装置、光記録装置及び光記録方法 Download PDFInfo
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- WO2004051635A1 WO2004051635A1 PCT/JP2003/015372 JP0315372W WO2004051635A1 WO 2004051635 A1 WO2004051635 A1 WO 2004051635A1 JP 0315372 W JP0315372 W JP 0315372W WO 2004051635 A1 WO2004051635 A1 WO 2004051635A1
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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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1267—Power calibration
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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
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
- G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive elements
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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
- G11B7/1372—Lenses
- G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
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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
- 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
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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
- G11B7/1372—Lenses
- G11B2007/13727—Compound lenses, i.e. two or more lenses co-operating to perform a function, e.g. compound objective lens including a solid immersion lens, positive and negative lenses either bonded together or with adjustable spacing
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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
- G11B7/0948—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 detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
Definitions
- Optical head device optical recording device, and optical recording method
- the present invention relates to an optical or magneto-optical medium such as an optical disc or an optical card.
- the present invention relates to an optical head device, an optical recording device, and an optical recording method for recording and Z or erasing information on an optical recording medium, particularly an optical recording medium having a plurality of information layers (for example, a multilayer optical disk or a multilayer optical head).
- the present invention relates to an optical head device, an optical recording device, and an optical recording method suitable for recording and / or erasing information.
- the wavelength of the light source has been shortened and the numerical aperture of the condenser lens (hereinafter abbreviated as NA) has been increasing.
- the wavelength of the light source used for DVD discs was 650 nm and the NA of the condenser lens was 0.6, but next-generation optical discs have a light source wavelength of 405 nm and the NA of the condenser lens.
- An optical system in which is set to 0.85 has been proposed.
- a multilayer optical disc in which a number of information layers are superposed at a predetermined interval in the thickness direction of the optical disc is under development.
- an aberration compensator is provided in advance to correct spherical aberration for each information layer.
- a transparent plate material for spherical aberration compensation is inserted between the condenser lens and the optical disk, or a wedge-shaped transparent block is combined to adjust the optical path length from the condenser lens to the information layer to a constant value.
- a spherical lens is compensated for by combining a concave lens and a convex lens between a lens or a condenser lens and a collimating lens that collimates the light from the light source, and making the lens interval variable with a voice coil motor. Things are known. These aberration compensators are disclosed in, for example, Japanese Patent No. 2502884 (Patent Document 3).
- the working distance which is the distance between the condenser lens and the optical disk, is, for example, 0.2 to 0.6 mm when a lens whose NA is 0.85 is used. Therefore, it is difficult to insert a plate or wedge-shaped block between the condenser lens and the optical disk, taking into account the surface shake and the external vibration accompanying the rotation of the optical disk. Therefore, generally, an aberration compensator is provided between the collimator lens and the condenser lens. Therefore, in the recording characteristic compensation in the multilayer optical disc, after performing spherical aberration compensation for each information layer, the output of the light source is controlled based on the detected aberration amount.
- An optical head device used for an optical disk having a plurality of information layers requires an aberration compensator for compensating aberration for each information layer and an aberration correction unit.
- This aberration correction means is for reducing the aberration that occurs when a condensing lens designed to have zero aberration for a specific substrate thickness is applied to information layers having different substrate thicknesses. .
- the aberration correcting means is driven so as to minimize the amount of aberration detected by the aberration detecting means provided in the optical head device.
- the detected aberration is a third-order spherical surface
- the aberration corrector converts the laser beam incident on the condenser lens into convergent light or divergent light, thereby determining which information
- the third order spherical aberration can be reduced to zero in the layer.
- the total aberration including the fifth or higher order aberration does not become zero, and the total aberration differs for each information layer. Therefore, in the above-described configuration of aberration detection and reduction, in an optical disc having a plurality of information layers, the detected amount of aberration differs from the actual aberration.
- the information in the first information layer and the second information layer is used by using an aberration detecting means for detecting a third-order spherical aberration as the spherical aberration.
- an aberration detecting means for detecting a third-order spherical aberration as the spherical aberration.
- Fig. 11 shows the relationship between substrate thickness unevenness, tertiary spherical aberration, and total aberration, with the substrate thickness of the optical disk as a parameter.
- the total aberration is an aberration including a third-order spherical aberration and a higher-order spherical aberration.
- the third-order spherical aberration is compensated by the aberration compensator so that the substrate thickness unevenness is 0 when the substrate thickness unevenness is 0.
- the unevenness in the thickness of the base material is the deviation or deviation from the original thickness of each of the first layer and the second layer (for example, the first layer 100 / im, the second layer 110m).
- the present invention has been made to solve the above-described problem, and has a learning time required for learning the relationship between the aberration amount and the optimum recording compensation amount even for an optical recording medium having a plurality of information layers. It is an object of the present invention to provide an optical head device, an optical recording device, and an optical recording method that can obtain optimum recording characteristics for each information layer without increasing the number of information layers.
- the optical head device is configured such that the output control means controls the output of the light source based on the driving amount of the wavefront converting means and information on the relationship between the driving amount and the output of the light source.
- FIG. 1 is a diagram showing a configuration of an optical head device according to Embodiment 1 of the present invention.
- FIG. 2 is a graph showing the relationship between the amount of driving sent from the aberration detecting means to the driving means and the corresponding optimum output of the light source in the optical head device according to the first embodiment of the present invention.
- FIG. 3 is a graph showing the relationship between the substrate thickness of the optical recording medium and the corresponding driving amount of the driving means in the optical head device according to the first embodiment of the present invention.
- FIG. 4 is a schematic plan view of the optical recording medium 9.
- FIG. 5 is a partially enlarged plan view of the optical recording medium 9.
- FIG. 6 is a flowchart showing the procedure of the learning operation.
- Figure 7 is a graph showing the relationship between the drive amount obtained by learning and the optimum recording power.
- FIG. 8 is a diagram showing another configuration example of the optical head device according to the first embodiment of the present invention.
- FIG. 9 is a diagram showing a configuration of an optical head device according to Embodiment 2 of the present invention.
- FIG. 10 is a diagram showing a configuration of a multilayer optical recording apparatus according to Embodiment 3 of the present invention.
- FIG. 11 is a graph showing the relationship between substrate thickness unevenness, tertiary spherical aberration, and total aberration, using the substrate thickness of the optical disc as a parameter.
- FIG. 1 is a diagram showing a configuration of an optical head device according to Embodiment 1 of the present invention.
- the optical head device 101 includes a light source 1, a collimating lens 2, a beam splitter 13, a wavefront converting means 4, a condenser lens 8, a detecting optical system 10, a photodetector 11, an aberration detecting means 1, 2, and output control means 13 are provided.
- the light source 1 is preferably a semiconductor laser, and emits a laser beam of 405 nm.
- the collimating lens 2 converts the laser light emitted from the light source 1 into parallel light.
- the beam splitter 3 branches the optical path of light.
- the wavefront converting means 4 has a convex lens 5, a concave lens 6, and a driving means 7.
- the driving means 7 drives the concave lens 6.
- a voice coil motor is preferably used.
- the optical recording medium 9 to which the optical head device 101 reads and writes data overnight has a plurality of information layers 9a, 9b, and 9c.
- An example in which a plurality of information layers are three layers will be described below, but the number of information layers of the optical recording medium targeted by the optical head device of the present invention is not limited to three layers. Needless to say.
- the detection optical system 10 collects the reflected light from the optical recording medium 9.
- the aberration detecting means 12 detects, for example, the third-order spherical aberration based on the signal obtained by the photodetector 11, and reduces the detected third-order spherical aberration (for example, to minimize it).
- the drive amount for driving the drive means 7 is sent to the drive means 7 and this drive amount is also sent to the output control means 13 described later.
- the output control means 13 controls the output of the light source 1 according to the driving amount which is the output of the aberration detection means 12.
- the output control means 13 has a learning means 51, which initially learns in advance the relationship between the driving amount sent from the aberration detecting means 12 to the driving means 7 and the optimum recording power. ing. More specifically, the learning means 51 removes unevenness in the base material thickness (distance from the light receiving side surface of the optical recording medium 9 to each information layer) of the information layers 9a to 9c of the optical recording medium 9. Accordingly, the user learns how to adjust the intensity of the laser beam incident on the condenser lens 8.
- the information obtained by learning taking this unevenness into account is information on the optimum recording power for the total aberration taking into account the third-order spherical aberration and the non-third-order spherical aberration.
- the learning means 51 stores learning data, that is, information obtained by learning, in a learning data memory 52 provided in the output control means 13, for example.
- the output control means 13 changes the light emission time and the peak level of the pulse light emission according to the learning data which is the information obtained by the learning means 51 and the drive amount output by the aberration detection means 12. It controls the recording phase.
- the learning means 51 only has to learn individually when the optical recording medium 9 having a plurality of target information layers 9a to 9c is loaded in the apparatus.
- the output control means 13 or the output control means 13 and the aberration detection means 12 may be realized by a computer operating according to a program stored in a memory such as a ROM (Read Only Memory).
- the program can be supplied through a recording medium such as ROM, CD-ROM, or via a transmission medium such as a network.
- FIG. 2 is a diagram showing the relationship between the driving amount sent from the aberration detecting means 12 to the driving means 7 and the corresponding optimum recording power of the light source 1.
- the amount of driving sent to the driving means 7 reduces the aberration detected by the aberration detecting means 12 (for example, ).
- the output of the light source 1 has a one-to-one relationship with the amount of driving to the driving means 7.
- the actual aberration does not include a higher-order spherical aberration exceeding the order of the aberration detected by the aberration detecting means 12 (for example, the third order, hereinafter referred to as “detection order”), and the driving amount is appropriate.
- the wavefront conversion means 7 can be operated appropriately by setting to not only reduce the spherical aberration of the detection order but also always make it 0, the relationship between the driving amount and the optimum recording power becomes It is represented by a horizontal straight line like curve C1. That is, in this case, the optimum recording power may be constant without depending on the driving amount.
- the optimum recording power may be constant without depending on the driving amount.
- the optimum recording power depends on the amount of driving as shown by the curve C.
- the light spot formed on the information layer 9a and the like spreads, and the power of the effective part which effectively contributes to reading and writing of information, which is the central part of the light spot, decreases. .
- the output of the laser light output from the light source 1 it is possible to compensate for the reduced power of the effective portion. Therefore, the optimum recording power increases as the actual aberration increases.
- FIG. 3 is a graph showing the relationship between the substrate thickness of the optical recording medium 9 and the corresponding drive amount of the drive means 7.
- the substrate thickness varies depending on whether the optical head device 101 reads / writes data, that is, irradiates the focused spot to any of the information layers 9a to 9c. Therefore, as the information layers 9a to 9 to be changed change, the focusing lens 8 moves along the optical axis so as to follow the focus control described below. However, performing focus control does not eliminate aberrations. As illustrated in FIG.
- the base material is different because the target information layer is different. If the thickness is different, a spherical aberration of the detection order appears, so a certain amount of drive is required to compensate for this.
- the wavefront converting means 7 is driven so that the light incident on the condenser lens 8 becomes divergent light as the base material thickness increases, and convergent light decreases as the base material thickness decreases.
- FIG. 2 shows that information on the target information layer, unevenness of the base material thickness, and spherical aberration of the detection order is reduced to a single amount called a drive amount, and the drive amount and the optimum recording power are one-to-one. Indicates that it is related to Therefore, it is possible to optimally set the laser light power depending only on the driving amount.
- the aberration detecting means 12 may change the driving amount along the curve from the driving amount D corresponding to the substrate thickness t. Then, along a curve C in FIG. 2 exemplifying the relationship between the drive amount and the optimum recording power, the output control means 13 corresponds to the variation P of the drive amount from the power P corresponding to the drive amount D. What is necessary is to shift the optimum recording phase by ⁇ P.
- the relationship between the optimum recording power and the driving amount for minimizing the spherical aberration of the detection order that is, the shape of the curve C illustrated in FIG. 2 is based on the substrate thickness and the number of information layers for each optical recording medium 9. And the like, or characteristic fluctuations of the optical head device 101 itself. Therefore, it is more practical to learn the relationship between the optimum recording power and the driving amount by learning as described above. The learning procedure will be described in detail later.
- the driving amount of the driving means 7 to be driven to correct the spherical aberration occurring in the optical recording medium 9 depends on the information layer of the optical recording medium on which the light is focused. It depends on where it is located. Therefore, it is possible to know on which information layer the focusing spot is located based on the value of the driving amount. Accordingly, when the output control means 13 receives the drive amount sent to the drive means 7, the output control means 13 determines the position of the focused spot in any of the information layers 9a to 9c of the optical recording medium. The third-order spherical aberration and the focused spot are located You will receive information about the sum of aberrations (total aberration) caused by the fluctuation of the base material thickness of the information layer.
- the optical head device 101 uses the drive amount sent from the aberration detection unit 12 to the drive unit 7 to the drive amount learned in advance by the output control unit 13 and the optimal power of the light source 1.
- the output of the light source 1 is controlled by associating it with the relationship.
- the operation of the optical head device 101 will be described along the optical path and the signal path.
- Light emitted from the light source 1 is converted into parallel light by the collimating lens 2, and the optical path is switched to the condenser lens 8 by the beam splitter 13.
- the wavefront conversion means 4 emits the incident parallel light as parallel light having a changed beam size.
- the light transmitted through the wavefront conversion means 4 is condensed by a condenser lens 8 on one of the information layers 9a, 9b, and 9c of the optical recording medium 9.
- the information layer 9c having a base material thickness larger than the information layer 9b and the information layer 9a having a smaller base material thickness
- third-order spherical aberration is generated.
- the reflected light from the optical recording medium 9 passes through the condensing lens 8, the wavefront converting means 4, and the beam splitter 13, passes through the detection optical system 10, and is condensed on the photodetector 11.
- the photodetector 11 uses the well-known spot size detection method and the three-beam method to detect the focus error signal and the tracking error detection method to obtain the necessary support signal for driving the focusing lens 8.
- the aberration detecting means 12 uses the signal of the photodetector 11 to detect the spherical aberration by the method described in relation to the related art, and to adjust the concave lens 6 so as to reduce the spherical aberration (for example, to minimize the spherical aberration). Move position.
- the drive amount output from the aberration detecting means 12 is sent to the wavefront converting means 4 (driving means 7) and also to the output control means 13, and the output control means 13 receives the inputted aberration detecting means 1 2
- the output of the light source 1 is controlled in accordance with the output of the light source (the driving amount of the driving means 7 in this example).
- FIG. 4 is a schematic plan view of the optical recording medium 9.
- the optical recording medium 9 includes, in addition to an information recording area 31 for recording user data, a learning operation for recording specific data on a trial basis, measuring the signal quality thereof, and finding an optimal recording condition. It has a test recording area 32 for performing. As shown in FIG. 5, in each of a plurality of sections 32 (1) to 32 (K) of the test recording area 32, the test data is recorded with different outputs.
- FIG. 6 is a flowchart showing the procedure of the learning operation performed by the learning means 51.
- the learning means 51 sets the information layer to which the test data is to be written to the first layer (for example, the information layer 9a) (S1).
- the learning means 51 causes the aberration detection means 12 to set a drive amount suitable for the target information layer.
- the driving means 7 drives the wavefront converting means 4 so as to compensate for the spherical aberration of the detection order.
- the learning means 51 sets the output P of the light source 1 to an initial value P0 (S3).
- the learning means 51 writes the test data, for example, in the section 32 (1) of the test recording area by driving the light source 1 (S4).
- the learning means 51 determines whether or not the output P is the final output (S5). If the output P is not the final output (No in S5), the learning means 51 increases the output P ( S6), the processing of steps S3 to S5 is executed again. That is, the learning means 51 executes the writing of the test data while increasing the output P sequentially from the initial value P0 to the final value. Each time the output P increases, the learning means 51 sequentially records the test data, for example, in the sections 32 (1) to 32 (K).
- the learning means 51 causes the photodetector 11 to read out the test data from the sections 32 (1) to 32 (K) in order, for example (S5). 7).
- the learning means 51 measures the jitter of the read test data (the fluctuation amount of the reproduced data position with respect to the reference clock) (S8).
- the learning means 51 determines the output P corresponding to the best zipper (S9).
- the determined output P is stored in the learning data memory 52 in association with the drive amount as the optimum recording power (S10).
- the learning means 51 determines whether or not the information layer is the last layer (S11). If not, the learning means 51 sets the target information layer to the next layer. (S12) and step S2 The following processing is executed again. On the other hand, if it is determined in step S11 that the information layer is the last layer, the learning means 51 ends the learning operation.
- the optimum recording power corresponding to a plurality of drive amounts is obtained as learning data, and stored in the learning data memory 52.
- the optical recording medium 9 has three information layers 9a, 9b, and 9c, for example, the driving amounts corresponding to the three data points Q1, Q2, and Q3 shown in FIG.
- the optimum set of recording power can be obtained by learning.
- the sections 32 (1) to 32 (K) about one round of the optical recording medium 9 is allocated as a whole, and therefore, in the learning, the fluctuation component of the driving amount due to the unevenness of the base material thickness, that is, the AC of the driving amount
- the components also called high-frequency components
- the learning means 51 executes the interpolation using, for example, a polynomial or a spline function based on the data points Q 1 to Q 3, thereby obtaining the optimum recording power and the drive represented by the curve illustrated in FIG. Get relationship with quantity.
- the obtained relation is stored in the learning data memory 52 as learning data, and is used for output control by the output control means 13.
- the output control means 13 Since the output control means 13 outputs the recording power according to the information obtained by learning, the total aberration of each information layer and the optimum recording power are linked in a one-to-one relationship, and the optical recording medium
- the convergence / divergence ratio of the laser light incident on the condenser lens 8 can be adjusted for each of the information layers 9a to 9c.
- the amount input to the output control means 13 includes, as described above, which of the information layers 9a to 9c of the information layer 9a to 9c of the optical recording medium. Since information about the position of the light spot and information about the spherical aberration are included, it is necessary to separately determine which of the information layers 9a to 9c of the optical recording medium the focused spot is located. There is no need to measure.
- the driving amount When the driving amount is separated into a DC component (corresponding to D in Fig. 3) and a high-frequency component (corresponding to in Fig. 3) through a filter, the DC component corresponds to each information layer as described above, and the high-frequency component Corresponds to the thickness variation of the substrate due to the movement of the optical recording medium (corresponding to At in Fig. 3), so the output control may be performed based on the product of the DC component and the high frequency component of the drive amount. As illustrated in FIG. 7, the slopes G1 to G3 of the curves at the respective data points Q1 to Q3 are proportional to the driving amount or at least increase with the driving amount.
- the high frequency component of the optimum recording power can be obtained with good accuracy by multiplying the high frequency component of the drive amount by the DC component.
- the curve illustrated in FIG. 7 is a quadratic curve (parabolic curve)
- the optimum recording power of the high-frequency component ( ⁇ ⁇ in FIG. 2) ) Is proportional to the product of the DC component D of the drive amount and the high-frequency component ⁇ D, so the accuracy of the high-frequency component of the optimum recording power obtained is the best.
- the amplitude of the high frequency component can be increased by taking the product of the high frequency component and the DC component.
- the magnitude of the component varies depending on the information layer where the condensed spot is located.Therefore, if the maximum amplitude of the variation of the product of the DC component and the AC component is examined, it is the current recording and reproduction target. Information about the location of the information layer can also be obtained.
- the optical head device 101 feeds back the drive amount output from the aberration detection means 12 to the wavefront conversion means 4 (more specifically, the drive means 7) to the output control means 13 as it is.
- a driving amount detecting means 55 for detecting the driving amount of the concave lens 6 is provided as in the optical head device 101A illustrated in FIG. The driving amount may be fed back to the output control means 13.
- the driving amount detecting means 55 various known moving amount detectors can be used.
- FIG. 9 is a diagram showing a configuration of an optical head device according to Embodiment 2 of the present invention.
- the same elements as those in FIG. Wavefront conversion means 14 shown in FIG. 9 has a structure in which liquid crystal element 61 is sandwiched between electrodes 62a and 62b.
- the phase of linearly polarized light can be changed by applying a voltage to a liquid crystal element.
- a plurality of coaxially arranged annular electrodes known as electrodes 62a and 62b are provided.
- spherical aberration can be corrected.
- coma aberration can be corrected by dividing each annular electrode radially.
- the optical head device 102 according to the second embodiment uses the wavefront conversion means 14 having the liquid crystal element 61, power consumption can be reduced and coma aberration can be corrected. enable.
- the optical recording device 103 includes an optical head device 15, a rotation drive unit 17, a circuit board 18, and a power supply 19.
- Reference numeral 5 denotes the optical head device 101, 101A or 102 according to the first or second embodiment.
- the rotation driving means 17 includes a motor, and supports and rotates the optical disk 16 as an example of an optical recording medium.
- the optical head device 15 sends a signal corresponding to the positional relationship with the optical disk 16 to the circuit board 18.
- the circuit board 18 calculates this signal and outputs a signal for finely moving the condenser lens 8 in the optical head device 15 or the optical head device 15.
- the optical head device 15 or the condensing lens 8 in the optical head device 15 includes a focus support drive mechanism (not shown), a tracking servo drive mechanism (not shown), and a drive mechanism for these.
- the optical disk 16 is controlled by a circuit board 18 having an electric circuit for controlling operations such as reading, writing, or erasing information. A focus support and a tracking support are performed on the optical disk 16 to read, write, or erase information on the optical disk 16.
- the power supply 19 may be a connection to an external power supply.
- the power supply 19 supplies electric power to the circuit board 18, the driving mechanism of the optical head device, the motor 17, and the condenser lens driving device. It should be noted that there is no problem even if the connection terminal for the power supply or the external power supply is provided individually in each drive circuit.
- the optical storage device constituted by using the optical head device of the present invention has the advantage that the recording compensation learning for each information layer is simplified, the recording compensation program is also simplified, and the device is started up quickly. Having.
- the optical head device comprises: a light source; a light collecting means for collecting light from the light source onto a desired information layer of an optical recording medium having a plurality of information layers; and a light source and the light collecting means.
- An optical head device comprising: a wavefront conversion unit provided therebetween; an aberration detection unit for a condensing spot in the desired information layer; and an output control unit for controlling an output of the light source.
- the conversion unit is driven to reduce the amount of aberration detected by the aberration detection unit, and the output control unit has information obtained by learning in advance the relationship between the drive amount of the wavefront conversion unit and the output of the light source.
- An output control of the light source is performed based on the driving amount of the wavefront converting means according to the aberration of the light collecting spot and the information.
- the optical head device having the above configuration not only enables easy recording compensation for a plurality of information layers by controlling the output of the light source using the output signal to the wavefront converting means, It does not learn the relationship between the amount of aberration and the optimal recording compensation amount for each information layer as shown in Fig. 2, but learns the relationship between the driving amount of the wavefront conversion means and the output of the light source.
- the time can be shortened, the amount of programs for learning can be reduced, and the startup can be accelerated.
- the optical head device includes a drive amount detection unit that detects a drive amount of the wavefront conversion unit, and the output control unit includes a drive amount detected by the drive amount detection unit.
- the output control of the light source is performed based on a moving amount.
- the output control means performs output control of the light source based on a product of a DC component and an AC component of a driving amount input to the wavefront conversion means.
- the output control means can control the power of the light source to an optimal light amount according to each information layer of the optical recording medium.
- the wavefront converting means is a liquid crystal element.
- the wavefront converting means has a plurality of lenses and a lens driving means for driving any one of the plurality of lenses to change a distance between the plurality of lenses, and the lens driving means includes It is desirable that the driving is performed so as to reduce the amount of aberration detected by the aberration detecting means.
- the output control means controls the output of the light source based on the driving amount and the information so as to compensate for higher-order spherical aberration that cannot be compensated by the wavefront transforming means.
- the optical recording device includes the optical head device and a rotary drive unit for rotating the optical recording medium.
- the optical recording device having this configuration not only enables easy recording compensation for a plurality of information layers, but also requires learning the relationship between the aberration amount and the optimal recording compensation amount for each information layer as in the conventional case. And learns the relationship between the driving amount of the wavefront conversion means and the output of the light source, so that the time required for learning can be shortened, the amount of programs for learning can be reduced, and the start-up can be accelerated. Can be.
- the optical recording method is an optical recording method for recording information on an optical recording medium having a plurality of information layers by a light-collecting spot of a light source, wherein a wavefront converting means is provided so as to reduce aberration of the light-collecting spot.
- the aberration of the condensed spot is detected, and the wavefront converting means is driven so as to reduce the aberration.
- the output of the light source is controlled based on the driving amount of the wavefront converting means.
- the optical recording method having this configuration not only enables easy recording compensation for a plurality of information layers, but also does not learn the relationship between the aberration amount and the optimum recording compensation amount for each information layer as in the conventional case. Since it is configured to learn the relationship between the drive amount of the wavefront conversion means and the output of the light source, the time required for learning can be shortened, the amount of programs for learning can be reduced, and the start-up can be accelerated. it can.
- the optical head device, the optical recording device, and the optical recording method according to the present invention increase the learning time required for learning the relationship between the aberration amount and the optimal recording compensation * even for an optical recording medium having a plurality of information layers. This makes it possible to obtain the optimum recording characteristics for each information layer without using it, and is industrially useful.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03776002A EP1569211A4 (en) | 2002-12-03 | 2003-12-02 | OPTICAL HEAD DEVICE, OPTICAL RECORDING DEVICE, AND OPTICAL RECORDING METHOD |
US10/509,097 US7342867B2 (en) | 2002-12-03 | 2003-12-02 | Optical head device, optical recording device, and optical recording method |
JP2004556877A JP4464830B2 (ja) | 2002-12-03 | 2003-12-02 | 光ヘッド装置、光記録装置及び光記録方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002351064 | 2002-12-03 | ||
JP2002-351064 | 2002-12-03 |
Publications (1)
Publication Number | Publication Date |
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WO2004051635A1 true WO2004051635A1 (ja) | 2004-06-17 |
Family
ID=32463131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/015372 WO2004051635A1 (ja) | 2002-12-03 | 2003-12-02 | 光ヘッド装置、光記録装置及び光記録方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7342867B2 (ja) |
EP (1) | EP1569211A4 (ja) |
JP (1) | JP4464830B2 (ja) |
CN (1) | CN100362580C (ja) |
WO (1) | WO2004051635A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006252615A (ja) * | 2005-03-08 | 2006-09-21 | Ricoh Co Ltd | 光ピックアップ装置およびこれを用いた光ディスクドライブ装置 |
JP2006252616A (ja) * | 2005-03-08 | 2006-09-21 | Ricoh Co Ltd | 光ピックアップ装置およびこれを用いた光ディスクドライブ装置 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005119669A1 (ja) * | 2004-06-03 | 2005-12-15 | Matsushita Electric Industrial Co., Ltd. | 光記録再生装置用光ヘッド |
CN100492503C (zh) * | 2004-11-15 | 2009-05-27 | 松下电器产业株式会社 | 光学头及信息记录再生装置 |
JP2008293606A (ja) * | 2007-05-25 | 2008-12-04 | Funai Electric Co Ltd | 光ピックアップ装置 |
JP5153424B2 (ja) * | 2008-04-11 | 2013-02-27 | 株式会社日立製作所 | 光ヘッド及び光ディスク装置 |
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JPH10269611A (ja) * | 1997-03-27 | 1998-10-09 | Pioneer Electron Corp | 光ピックアップ及びそれを用いた多層ディスク再生装置 |
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JPS54143109A (en) * | 1978-04-28 | 1979-11-08 | Hitachi Ltd | Optical information device |
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US5657307A (en) * | 1995-03-10 | 1997-08-12 | Sharp Kabushiki Kaisha | Optical data reading apparatus and method |
JP2000182254A (ja) | 1998-12-15 | 2000-06-30 | Pioneer Electronic Corp | ピックアップ装置 |
JP4531895B2 (ja) * | 1999-12-06 | 2010-08-25 | オリンパス株式会社 | レーザ集光光学系及びそれを用いたレーザ走査型顕微鏡 |
JP2002072108A (ja) * | 2000-08-31 | 2002-03-12 | Oki Electric Ind Co Ltd | 可変波長分波器 |
JP2002133694A (ja) * | 2000-10-30 | 2002-05-10 | Matsushita Electric Ind Co Ltd | 光記録装置、光記録方法、媒体、および情報集合体 |
JP2002163830A (ja) * | 2000-11-24 | 2002-06-07 | Toshiba Corp | 光学的収差を利用した光情報処理システムおよび厚みムラのある透明層で保護された記録層を持つ情報媒体 |
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- 2003-12-02 WO PCT/JP2003/015372 patent/WO2004051635A1/ja active Application Filing
- 2003-12-02 JP JP2004556877A patent/JP4464830B2/ja not_active Expired - Fee Related
- 2003-12-02 CN CNB2003801003651A patent/CN100362580C/zh not_active Expired - Fee Related
- 2003-12-02 US US10/509,097 patent/US7342867B2/en not_active Expired - Fee Related
- 2003-12-02 EP EP03776002A patent/EP1569211A4/en not_active Withdrawn
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JPH10269611A (ja) * | 1997-03-27 | 1998-10-09 | Pioneer Electron Corp | 光ピックアップ及びそれを用いた多層ディスク再生装置 |
JP2001160233A (ja) * | 1999-12-02 | 2001-06-12 | Pioneer Electronic Corp | 光学記録装置 |
JP2003132573A (ja) * | 2001-10-19 | 2003-05-09 | Sharp Corp | 光ピックアップ装置および光記録媒体駆動装置 |
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JP2006252615A (ja) * | 2005-03-08 | 2006-09-21 | Ricoh Co Ltd | 光ピックアップ装置およびこれを用いた光ディスクドライブ装置 |
JP2006252616A (ja) * | 2005-03-08 | 2006-09-21 | Ricoh Co Ltd | 光ピックアップ装置およびこれを用いた光ディスクドライブ装置 |
JP4530884B2 (ja) * | 2005-03-08 | 2010-08-25 | 株式会社リコー | 光ピックアップ装置およびこれを用いた光ディスクドライブ装置 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2004051635A1 (ja) | 2006-04-06 |
EP1569211A1 (en) | 2005-08-31 |
JP4464830B2 (ja) | 2010-05-19 |
CN1692415A (zh) | 2005-11-02 |
EP1569211A4 (en) | 2009-01-28 |
US20050174920A1 (en) | 2005-08-11 |
US7342867B2 (en) | 2008-03-11 |
CN100362580C (zh) | 2008-01-16 |
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