JP2010118135A - Method of controlling pickup device, and disk device and method of setting the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of controlling a pickup device precisely calculating the position of an optical element, and to provide a disk device and a method of setting the same to properly control an actuator of the pickup device of the disk device. <P>SOLUTION: The position of the optical element is calculated by calculation based on light 300 radiated to a sensor part. Pickup device information on the actuator is extracted from an actuator signal of the pickup device 2A to check a required improvement/correction level generated in the actuator, and the results of checking the required improvement/correction level are stored as information in storage circuit parts 111 and/or 112. The disk device 1A is equipped with the pickup device 2A. Upon assembling the disk device 1A or after assembling the disk device 1A, a control part 100 of the disk device 1A reads the check results. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention reproduces data, information, signals, etc. recorded on various media such as various optical discs, and records data, information, signals, etc. on various media such as various writable or rewritable optical discs. The present invention relates to a control method for a pickup device, a disc device, and a setting method thereof.

  A signal or the like recorded on a medium such as an optical disk is reproduced by laser light (LASER: light amplification by stimulated emission of radiation) emitted from the optical pickup device. Further, a signal or the like is recorded on a medium such as an optical disk by the laser light emitted from the optical pickup device. The optical pickup device is built in an optical disc device that can accommodate media such as an optical disc.

  As for the optical pickup device, for example, the magnet magnetization pattern is devised, and the arrangement of the focus coil, tracking coil, and tilt coil is devised, so the number of parts is reduced and the size can be reduced, and the response An optical pickup device that is excellent in configuration can be configured (see, for example, Patent Document 1).

  In recent years, for example, in order to speed up the response characteristics of an optical disk apparatus with respect to an optical disk, the response frequency characteristics of a lens actuator constituting an optical pickup apparatus has been increased in bandwidth. An actuator means a driving device that converts energy into translational motion, rotational motion, and the like, for example.

  On the other hand, due to the characteristics of the actuator of the optical pickup device, a state in which the attitude of the lens of the actuator main body constituting the optical pickup device changes periodically, for example, a self-resonant state, at a frequency substantially close to the rotational speed region of the optical disk device. is there. The change in the posture of the lens is called, for example, a rolling phenomenon. When a rolling phenomenon occurs in the lens of the actuator main body, this rolling effect occurs in the optical pickup device. For example, an error that cannot be suppressed with respect to a tracking error signal occurs in the optical pickup device.

  Therefore, for example, a special control coil for canceling the resonance of the lens of the actuator is formed, and an optical pickup device including a focus coil, a tracking coil, and a tilt coil is provided. Furthermore, it was considered to equip a special control coil. For example, a differential control signal corresponding to a tracking drive signal is applied to a special control coil for tracking servo, or a focus control signal is applied to a special control coil for focus servo. It was considered to apply a corresponding differential signal. Servo means, for example, a mechanism that automatically corrects and controls by measuring the state of an object to be controlled and comparing it with a predetermined reference value.

JP 2006-24277 A (pages 1, 5 and 1-7)

  However, even if an optical pickup device including the focus coil, tracking coil, and tilt coil is further equipped with the special control coil, the special control coil is provided in the actuator structure of the optical pickup device. It was almost difficult to do.

  Further, even if an optical pickup device equipped with a special control coil can be configured, an increase in the cost of the optical pickup device due to an increase in the number of special control coils has been a problem. In addition, there has been a concern about the cost increase of the optical disk device accompanying the cost increase of the optical pickup device.

  In order to solve the above-described problem, a control method for a pickup device according to a first aspect of the present invention includes an optical element that focuses light on a medium, and the light that is irradiated and reflected on the medium. A pickup apparatus control method for controlling the optical element by using a pickup device including at least a light receiving element having a sensor unit, wherein the sensor unit performs an operation based on the light emitted. Thus, the position of the optical element is calculated.

  The method for controlling a pickup device according to claim 2 is the method for controlling a pickup device according to claim 1, wherein the light is caused to follow the signal surface portion when the light is condensed on the signal surface portion of the medium. Further, the optical element is controlled by operating a focus servo for focusing the light on the signal surface portion and a tracking servo for tracing a track of the signal surface portion.

  The control method of the pickup device according to claim 3 is the control method of the pickup device according to claim 1 or 2, wherein tilt control for tilting the optical element according to warping of the media is controlled by differential driving of focus. It is characterized by making it.

A pickup apparatus control method according to a fourth aspect is the pickup apparatus control method according to any one of the first to third aspects, wherein the tilt angle of the optical element is defined as A and is substantially in the radial direction of the medium. When the movement amount of the optical element along is determined as M, the movement amount M is determined based on the following formula (I), and when the optical element is tilted corresponding to the warp of the media, The movement amount M is corrected substantially along the radial direction of the medium.
M = C × A (I)
(However, the coefficient C in the formula (I) is an arbitrary numerical value.)

  The method for controlling a pickup device according to claim 5 is the method for controlling a pickup device according to any one of claims 1 to 4, wherein at least one of a focus error signal and a tracking error signal is used. Is used to calculate a signal sent to the coil of the pickup device.

According to a sixth aspect of the present invention, there is provided a method for controlling a pickup device according to the fifth aspect, wherein the signal sent to the coil is calculated based on the following equation (A).

（但し、式中の係数Ａ１１，Ａ１２，Ａ１３，Ａ１４，Ａ２１，Ａ２２，Ａ２３，Ａ２４，Ａ３１，Ａ３２，Ａ３３，Ａ３４は、任意の値とされる。） The method for controlling a pickup device according to claim 7 is the method for controlling a pickup device according to any one of claims 1 to 4, wherein the optical element is driven substantially along at least an optical axis direction of the optical element. A first focus / tilt coil, a second focus / tilt coil, and a tracking coil that drives the optical element substantially along a radial direction of the medium. An input drive signal is defined as FO1, a drive signal input to the second focus / tilt coil is defined as FO2, a drive signal input to the tracking coil is defined as TR, and the optical element is applied to the medium. A focus error signal detected when a defocus of the light substantially along the optical axis direction occurs The tracking error signal detected when the defocus of the light substantially along the radial direction of the medium occurs with respect to the medium is defined as TE, and the focal angle of the light with respect to the medium is defined as TE. The drive signal input to the first focus / tilt coil when the correction tilt amount signal for correcting the angle shift of the optical element when the shift occurs is defined as TILT is based on the following equation (1). The drive signal input to the second focus / tilt coil is determined based on the following equation (2), and the drive signal input to the tracking coil is determined based on the following equation (3). It is characterized by that.

(However, the coefficients A11, A12, A13, A14, A21, A22, A23, A24, A31, A32, A33, A34 in the equation are arbitrary values.)

The control method of the pickup device according to claim 8 is the control method of the pickup device according to claim 7, wherein, if necessary, the coefficients A13 and A23 are inputted with arbitrary values excluding zero, The coefficient A23 with respect to the coefficient A13 is characterized by having positive and negative values.

  The pickup apparatus control method according to claim 9 is the pickup apparatus control method according to claim 7 or 8, wherein an arbitrary value excluding zero is input to the coefficients A14 and A24 as necessary. And

  The pickup apparatus control method according to claim 10 is the pickup apparatus control method according to any one of claims 7 to 9, wherein an arbitrary value excluding zero is set to the coefficients A11 and A21 as necessary. It is inputted, and the coefficient A21 is different from the coefficient A11 at that time.

  The control method for the pickup device according to claim 11 is the control method for the pickup device according to any one of claims 7 to 10, wherein when the rolling of the optical element is about to occur, the coefficient A13, An arbitrary value excluding zero is input to A23, and the value input to the coefficients A13 and A23 is changed according to the rolling frequency of the optical element.

  A disc device according to a twelfth aspect is characterized in that the method for controlling a pickup device according to any one of the first to eleventh aspects is executable.

  The pickup apparatus control method according to claim 13 causes the pickup apparatus information of the actuator to be extracted from a signal of the actuator of the pickup apparatus, investigates the required correction level generated in the actuator, and investigates the required correction level. The result is stored in the information section as information, and the pickup device is mounted on the disk device, and when the disk device is assembled or after the disk device is assembled, the investigation result is read by the control unit of the disk device. It is characterized by.

  15. The disk device setting method according to claim 14, wherein the pickup device information of the actuator is extracted from a signal of the actuator of the pickup device, and a required correction level generated in the actuator is investigated, and the required correction level is investigated. The result is stored in the storage circuit unit as information, and the pickup device is mounted on the disk device, and when the disk device is assembled or after the disk device is assembled, the investigation result is read by the control unit of the disk device. It is characterized by that.

  The disk device setting method according to claim 15 is the disk device setting method according to claim 13 or 14, wherein an excitation signal is added to the tracking signal of the actuator in a state where the disk device is completed. The injection signal level from the tracking error signal to the focus signal is determined using an index when the tracking error signal is maximum.

  The disc device setting method according to claim 16 is the disc device setting method according to any one of claims 13 to 15, using a basic medium in which a tilt amount in the medium is minimized, Light is emitted from the pickup device toward the basic medium, and when the focus of the pickup device with respect to the basic medium is on, the actuator is vibrated in a tracking direction, and the reflection level from the basic medium at that time The light change amount and the rolling level of the actuator are measured, and an optimum value of the correction level is obtained based on the measurement result.

The disk device setting method according to claim 17 is the pickup device according to any one of claims 1 to 11, wherein the disk device setting method according to any one of claims 13 to 16 is executed. This control method can be executed.

  A disk device according to an eighteenth aspect is characterized in that the disk device setting method according to any one of the thirteenth to sixteenth aspects can be executed.

  The disk device according to claim 19 is executed by the method for setting a disk device according to any one of claims 13 to 16, and the control method for the pickup device according to any one of claims 1 to 11. Is made executable.

  As described above, according to the present invention, it is possible to provide a method for controlling a pickup device that can accurately calculate the position of an optical element.

  Further, according to the present invention, light can be accurately collected on the signal surface portion of the medium. By operating the focus servo and the tracking servo, the optical element for condensing the light on the medium is controlled, and the position of the optical element is calculated.

  In addition, according to the present invention, it is possible to configure a disk device capable of executing a pickup device control method capable of accurately calculating the position of an optical element.

  Moreover, according to the present invention, the actuator of the pickup device of the disk device can be appropriately controlled. An appropriate correction amount is added to the actuator by the control unit of the disk device in accordance with the characteristics of the single actuator of the pickup device, and the actuator of the pickup device is appropriately controlled by the control unit of the disk device. In addition, the actuator can be improved by causing the control unit of the disk device to read the investigation result of the improvement level required for correction, which is the information stored in the information unit / storage circuit unit. Thus, for example, by adopting a measure that can be taken as a system, the degree of freedom in designing the actuator is improved, and it is possible to cope with cost reduction.

  In addition, according to the present invention, it is possible to provide a disk device in which the degree of freedom in designing the actuator is improved and the cost can be reduced.

It is an optical arrangement | positioning figure which shows 1st embodiment of the pick-up apparatus with which the control method of the pick-up apparatus which concerns on this invention is performed. It is explanatory drawing which shows the spot arrangement | positioning on a medium, and an error signal detection system. 1 is a side view showing a first embodiment of a pickup device in which a control method for a pickup device according to the present invention is executed. It is a side view which similarly shows a pick-up apparatus. It is a side view which similarly shows a pick-up apparatus. It is a side view which similarly shows a pick-up apparatus. It is a side view which similarly shows a pick-up apparatus. It is a side view which similarly shows a pick-up apparatus. It is a side view which similarly shows a pick-up apparatus. It is a wave form diagram which shows the rolling frequency which arises in the lens of a pick-up apparatus. It is a wave form diagram which shows the rolling frequency which arises in the lens of a pickup apparatus similarly. It is the schematic which shows a part of signal path | route of a pick-up apparatus. It is explanatory drawing which shows the relationship between the tilt angle of the holder of a pick-up apparatus, and holder movement amount. It is a schematic plan view which shows a pick-up apparatus. It is explanatory drawing which shows 1st embodiment of the disc apparatus which concerns on this invention, and its setting method. It is a block diagram which shows a part of servo signal path | route of a disc apparatus. It is explanatory drawing which shows the arithmetic processing path | route when calculating a drive signal. It is a schematic plan view which shows 2nd embodiment of the pick-up apparatus with which the control method of the pick-up apparatus which concerns on this invention is performed. It is explanatory drawing which shows 3rd embodiment of the disc apparatus which concerns on this invention, and its setting method.

  Embodiments of a control method for a pickup device, a disk device, and a setting method thereof according to the present invention will be described below in detail with reference to the drawings.

  1 to 14 are diagrams showing a first embodiment of a pickup apparatus in which a control method of the pickup apparatus according to the present invention is executed, and FIGS. 15 to 17 are disk apparatuses and a setting method thereof according to the present invention. It is a figure which shows the thing regarding the first embodiment.

  1 to 14 are drawn for the sake of convenience in order to easily explain the first embodiment of the pickup device. 15 to 17 are drawn for the sake of convenience in order to easily understand the first embodiment of the disk device. Each figure will be described in detail. FIG. 1 is an optical layout diagram showing a pickup apparatus 2A in which a control method of the pickup apparatus 2A / optical disk apparatus 1A is executed. FIG. FIGS. 3 to 9 are explanatory views showing the arrangement of the respective focused spots 301, 302, 303, and 304 and the detection system of the tracking error signals TE1 and TE2, and FIGS. 3 to 9 show the actuator main body 70 constituting the actuator 50 of the pickup device 2A. It is explanatory drawing which shows the actuator main body part 70 of the pick-up apparatus 2A when the actuator main body part 70 is side-viewed from the rotation center axis penetration part 75 side. 3 to 9 are side views showing a state in which the actuator main body 70 is viewed from the side substantially along the extending direction of the linear support members 61, 62, 63, 64, 65, 66.

  Note that media means media that records and mediates information and media that records and transmits information. For example, the medium here means a disk on which data, information, signals, and the like are stored. For example, one track is formed in a substantially spiral shape from the inner circumference side to the outer circumference side of the substantially disc-shaped optical disc 200.

  First, the optical pickup device 2A, the optical disc device 1A, and control methods thereof will be described.

  This optical pickup device 2A (FIGS. 1, 3 and 15) is made of synthetic resin or glass made by narrowing and irradiating various media 200 such as a disc 200 (FIGS. 1 and 15) with a laser beam 300. A first objective lens 11 (FIGS. 1 and 3) serving as one optical element and a second objective lens 12 serving as a second optical element made of synthetic resin or glass are provided. The optical pickup device 2A includes a pair of optical elements, so-called objective lenses 11 and 12.

The optical pickup device 2A includes various media 200 such as various optical discs 200 (FIG. 15).
The data, information, signals, etc. recorded in the are reproduced. In addition, the optical pickup device 2A records data, information, signals, images, and the like on various media 200 such as various writable or rewritable optical discs 200. Corresponding to various media 200 such as various optical discs 200 capable of erasing data, information, signals, etc., the optical pickup device 2A has data, information, signals, etc. recorded on various media 200 such as various optical discs 200. To erase.

  The optical pickup device 2A includes, for example, a “CD” (Compact Disc) (trademark) series media, a “DVD” (registered trademark) (Digital Versatile Disc) series media, and an “HD DVD” (High Definition DVD) (registration). Trademark) media, “CBHD (China Blue High-Definition)” (eg, formerly “CH-DVD”) media, “Blu-ray Disc” (registered), which is a media based on a standard established in China Trademark) media. The optical pickup device 2A corresponds to, for example, at least one medium selected from the group consisting of the various media. More specifically, the optical pickup device 2A corresponds to any one of the plurality of media.

  For example, the optical pickup device 2A is compatible with both the optical disc 200 of the CD standard and the DVD standard. Note that the track pitch 214 (FIG. 2) of the CD standard optical disk 200 such as CD-ROM, CD-R, CD-RW, etc. and the track of the DVD-ROM, DVD-R, DVD + R, DVD-RW, DVD + RW optical disk 200. The pitch 214 is different from the track pitch 214 of the DVD-RAM (Version 1) optical disc 200 and the track pitch 214 of the DVD-RAM (Version 2.0, 2.1) optical disc 200. The optical disc 200 is drawn together for convenience. Further, the shape / arrangement / form, etc. of the spots 301, 302, 303, 304 of each light irradiated / formed on the signal surface portion 210 of the optical disc 200 are the drawn shape / arrangement / form, etc. for convenience. .

  Examples of the medium 200 include the various optical disks 200 described above, and the medium 200 having the following form is also included. For example, the disk 200 may be an optical disk 200 in which signal surface portions 210 and 220 are provided on both surfaces of the disk, and data writing / erasing, data rewriting, and the like are possible. Further, as the disc 200, for example, an optical disc 200 provided with two layers of signal surface portions 210 and 220 and capable of data writing / erasing, data rewriting and the like can be cited. Further, for example, an “HD DVD” optical disc provided with a three-layer signal surface portion and capable of data writing / erasing, data rewriting, and the like (not shown). Further, for example, a “Blu-ray Disc” optical disc provided with a four-layer signal surface portion and capable of data writing / erasing, data rewriting, and the like (not shown) is also included. Further, for example, an optical disc 200 or the like in which various kinds of writing such as a label can be performed by irradiating the laser beam 300 on the side of the label surface portion (220) of the optical disc 200 is also possible. In addition, the parentheses () attached to the reference numerals in this specification are used for convenience in order to explain the slightly different things from those shown in the drawings. The signal surface portion 210/220 and the label surface portion (220) of the optical disc 200 are configured to include a thin layer such as a metal thin film, for example. Data, information, a signal, etc. are recorded on the signal surface part 210/220 comprised with a metal thin film etc., and an image etc. are recorded on a label surface part (220).

  In addition, for example, an optical pickup or an optical pickup unit is abbreviated as “OPU”. The media means a disk on which data, information, signals, and the like are stored, for example.

  The OPU 2 </ b> A includes a laser drive circuit unit (not shown) that emits laser light 300 from the light emitting element 3 by causing electricity to flow through the light emitting element 3. The laser drive circuit section so-called laser driver is called “LDD” or the like. “LDD” is an abbreviation for “LD driver”. The LDD includes a laser driving circuit that drives the light emitting element 3 to emit laser light 300 having a predetermined wavelength from the light emitting element 3. The LDD is configured as, for example, a standardized LDD that can be used in common with other OPUs.

  Further, the OPU 2A includes at least one light emitting element 3 so-called laser diode (LD) that irradiates the optical disc 200 (FIGS. 1 and 15) with the laser beam 300. For example, “HD that can emit blue-violet laser light 300 having a wavelength of about 340 to 450 nm (nanometer), preferably about 380 to 450 nm, more preferably more than about 400 nm and 450 nm or less, and a reference wavelength of about 405 nm. A laser beam 300 of 0.2 to 500 mW (milliwatt) for “DVD” or “CBHD” and / or “Blu-ray Disc” is emitted from the LD 3. Further, for example, a laser beam 300 of 0.2 to 500 mW for “DVD” capable of emitting a red laser beam 300 having a wavelength of about 630 to 685 nm and a reference wavelength of about 635 nm or 650 nm is emitted from the LD 3. . Further, for example, a laser beam 300 of 0.2 to 500 mW for “CD” capable of emitting an infrared laser beam 300 having a wavelength of about 765 to 840 nm and a reference wavelength of about 780 nm is emitted from the LD 3. The LD 3 is configured as a special LD 3 capable of emitting laser light 300 having a plurality of types of wavelengths, for example.

  More specifically, the LD 3 (FIG. 1) emits a first laser beam 300 having a first wavelength (for example, 780 nm) of 0.2 to 500 mW in an infrared wavelength band approximately 765 nm to 840 nm suitable for the CD standard. A first light source 3I and a second light source 3II that emits a second laser beam 300 having a second wavelength (for example, 650 nm) of 0.2 to 500 mW in a red wavelength band of approximately 630 nm to 685 nm suitable for the DVD standard; For example, a multi-laser unit. The LD 3 has two types, a first laser beam 300 and a second laser beam 300 having a wavelength different from that of the first laser beam 300 and a shorter wavelength than the first laser beam 300. For example, it is configured as a two-wavelength LD 3 capable of emitting a laser beam 300 having a wavelength of. Thus, the LD 3 is an LD 3 that can emit laser light 300 having a plurality of types of wavelengths. The first light source 3I and the second light source 3II constitute a semiconductor laser element.

  For example, a laser beam 300 having an output value of 0.2 to 500 mW, specifically 0.5 to 400 mW, is emitted from the LD 3. For example, when the laser beam 300 has an output value of less than 0.2 mW, the amount of the laser beam 300 that is reflected after reaching the optical disc 200 after reaching the optical disc 200 is insufficient. When reproducing each data on the optical disc 200, the laser beam 300 having an output value of several to several tens of mW such as 0.2 mW or more, preferably 0.5 mW or more, more preferably 2 mW or more and 20 mW or less is sufficient. When writing each data or the like on the optical disc 200, a laser beam 300 having an output value of several tens to several hundreds mW is required. For example, when writing each data or the like on the optical disc 200 at a high speed, a pulse laser beam 300 having a high output value such as 400 mW or 500 mW may be required.

  The LD 3 is configured as, for example, a substantially cylindrical or substantially cylindrical CAN package type laser diode having excellent heat dissipation. Depending on the design / specifications of the OPU 2A, for example, a substantially plate-shaped lead frame package type laser diode (not shown) that can cope with a reduction in thickness, size, etc. may be used instead of the CAN package type LD 3. .

The first laser light 300 and the second laser light 300 respectively emitted from the first light source 3I and the second light source 3II constituting the LD 3 are supplied to the main beam (by the diffraction grating 4 divided into a plurality of parts such as four parts). Zero order light) and two sub-beams (± first order diffracted light flux) at least 3
After being diffracted to generate a beam, the divergence angle is adjusted by, for example, the coupling lens 5I and reflected by the polarizing filter surface of the plate-type polarizing member 6.

  The diffraction grating is handled by being called, for example, a grating. The grating is also called GRT. The diffraction grating 4 is configured to divide the laser beam 300 emitted from the LD 3 using light diffraction into several parts. More specifically, the diffraction grating 4 plays a role of dividing the laser light 300 emitted from the LD 3 into at least one main beam and two sub-beams by utilizing light diffraction.

  The OPU 2A includes a first laser wavelength light, a second laser wavelength light that is a laser light 300 having a wavelength different from the first laser wavelength light, and a laser light 300 having a shorter wavelength than the first laser wavelength light, The first laser wavelength light is divided into at least one first main beam and two first sub beams, and the second laser wavelength light is divided into at least one second main beam and two second sub beams. A diffraction grating 4 having a diffractive surface portion corresponding to the second laser wavelength light and having the second laser wavelength light as a reference is provided.

  For example, in a conventional two-wavelength diffraction grating (both not shown) having both a CD diffraction grating part and a DVD diffraction grating part, the first laser beam 300 conforming to the CD standard or the DVD standard is conformed. As a result of the second laser beam 300 passing through both the CD diffraction grating portion and the DVD diffraction grating portion, unnecessary diffraction light is generated. In order to eliminate the generation of such unnecessary diffracted light, the diffraction grating 4 is configured only with a diffraction grating portion for one-wavelength light conforming to the DVD standard.

  The coupling lens 5I adjusts the laser beam 300 emitted from the LD 3, for example. The coupling lens is sometimes referred to as a divergent lens or an intermediate lens.

For example, a polarizing beam splitter is used as the polarizing member 6. The polarization beam splitter is abbreviated as “PBS”, for example. "PBS" is "Polarized"
The abbreviation of “Beam Splitter” or “Polarizing Beam Splitter”. For example, a half mirror is used as the polarizing member 6. The half mirror is configured to transmit a part of the laser light and reflect a part of the laser light. The half mirror (Half Mirror) is abbreviated as “HM”, for example. For example, a dichroic mirror is used as the polarizing member 6. Dichroic means having two hues. The dichroic mirror is abbreviated as a dichroic mirror or the like.

  The laser light 300 reflected by the polarizing member 6 is formed into substantially parallel light by a collimator lens 7 that is an optical lens, and then passes through the quarter-wave plate 8 and is converted into circularly polarized light. 9, the optical axis is bent and incident on an objective lens 11/12 that is an optical lens, converged by the objective lens 11/12, and irradiated onto the optical disc 200.

  The collimator lens 7 emits the light incident on the lens from the LD 3 side as parallel light or substantially parallel light. Parallel light means light that travels in parallel without any rays spreading. On the other hand, for example, diffused light means light from a light source that diffuses and irradiates light in various directions. The collimator lens is also called, for example, a collimator lens. The collimator lens is abbreviated as “CL” or “COL”.

The quarter-wave plate 8 changes linearly polarized light into circularly polarized light or changes circularly polarized light into linearly polarized light.
The linearly polarized light is circularly polarized, and the laser light 300 between the quarter-wave plate 8 and the optical disk 200 is circularly polarized. Data recording / reproducing operation is normally performed. Also, when linearly polarized light is circularly polarized, and laser light 300 between the quarter-wave plate 8 and the optical disk 200 is circularly polarized, data writing / reproduction is performed on the optical disk 200. Improved characteristics. The quarter wavelength plate is also called a quarter λ plate. There are OPUs (not shown) in which the quarter-wave plate 8 is not interposed in the optical path depending on the model of the OPU 2A. The quarter-wave plate (Quarter-Wave Plate) is abbreviated as “QWP”.

  The reflection mirror 9 is provided with a coating that substantially totally reflects the laser beam 300. Therefore, the laser beam 300 applied to the reflection mirror 9 is substantially totally reflected.

  The objective lens 11/12 plays a role of condensing the laser beam 300 emitted from the LD 3 onto the optical disc 200. The laser beam 300 condensed by the objective lens 11/12 is applied to the signal layer 210/220 (FIG. 15) of the optical disc 200. The objective lens is abbreviated as “OBL”.

  For example, in order to make the OPU 2A compatible with the optical disc 200 having a plurality of signal layers 210 and 220 of the first signal layer 210 and the second signal layer 220, OBL11 / 12 (FIGS. 1, 3 to 9) The OPU 2A is provided so as to be movable substantially along the optical axis direction Df of the OBL 11/12. By providing the OPU 2A in a state in which the OBL 11/12 is movable substantially along the optical axis direction Df of the OBL 11/12, an OPU 2A that is compatible with the optical disc 200 having the plurality of signal layers 210 and 220 is configured. Further, the OBL 11/12 is provided in the OPU 2A so as to be able to move substantially along the disk radial direction Dr in order to accurately follow the track 212 and the like of the signal layer 210 and the like of the optical disk 200 (FIG. 2). Further, the OBL 11/12 (FIGS. 1 to 3 to 9) has a swing direction Dt (FIGS. 3 to 9) to accurately follow the track 212 and the like of the signal layer 210 and the like of the optical disc 200 (FIG. 2). ) Is provided in the OPU 2 </ b> A so as to be movable substantially along.

  In order to be able to support the optical disc 200 having a plurality of signal layers 210 and 220 of the first signal layer 210 and the second signal layer 220 of the optical disc 200, for example, according to the design / specification of the OPU 2A (FIG. 15). CL7 (FIG. 1) is provided in the OPU 2A in a state in which it can move substantially along the optical axis direction of CL7. By providing the OPU 2A in a state in which the CL 7 is movable substantially along the optical axis direction of the CL 7, an OPU 2A that can correspond more reliably to the optical disc 200 having the plurality of signal layers 210 and 220 (FIG. 15) is configured. Is done.

  As described above, the diffraction grating 4 (FIG. 1), the coupling lens 5I, the polarizing member 6, CL7, QWP8, the reflection mirror 9, OBL11 / 12, and the like are examples of the OPU2A condensing optical system. The OBL 11/12 and the diffraction grating 4 collect the main beam and two sub beams branched by the diffraction grating 4, and are tilted substantially parallel or obliquely with respect to the elongated track 212 on the track 212 of the optical disc 200. Thus, the main spot 302 corresponding to the main beam and the two sub-spots 303 and 304 corresponding to the two sub beams are irradiated in substantially one row.

  Depending on the design / specifications of the OPU 2A, for example, the coupling lens (5I) may be omitted without being equipped. 1 shows an optical arrangement example of the OPU 2A in which the QWP 8 is positioned between the CL 7 and the reflection mirror 9. However, depending on the design / specifications of the OPU 2A, for example, the CL (7) and the reflection mirror (9) The OPU (2A) in which the QWP (8) is positioned between the polarizing member (6) and the CL (7) can be used without being equipped with the QWP (8).

  Further, in the OPU 2A capable of recording a signal on the optical disc 200, a light receiving element so-called front monitor diode 5II that monitors the laser light 300 emitted from the LD 3 and applies feedback for controlling the LD 3 is provided around the polarizing member 6, for example. Equipped nearby.

  The light receiving element provided near the periphery of the polarizing member 6 is configured as a front monitor diode 5II to which a part of the laser light 300 is irradiated. The front monitor diode is abbreviated as “FMD”. The FMD 5II monitors the laser beam 300 output from the LD 3 and applies feedback for controlling the LD 3.

  By driving the OBL 11/12 substantially along the optical axis direction Df, the disc radial direction Dr, and the swinging direction Dt, the laser light 300 is focused on the signal layer 210 of the optical disc 200 and a predetermined track 212 of the optical disc 200 is obtained. The laser beam 300 is irradiated from the OBL 11/12 (FIG. 1) toward the optical disc 200 so that the laser beam 300 follows (FIG. 2).

  The laser beam 300 modulated and reflected by the signal layer 210 of the optical disc 200 returns to the OBL 11/12, and reaches the polarizing member 6 via a return path that is substantially the same optical path as the forward path. When the signal layer 210 of the optical disc 200 is irradiated with, for example, a right-turn laser beam 300, the reflected laser light 300 becomes, for example, circularly polarized light that is inverted to the left-turn laser beam 300. Further, the laser light 300 that has been, for example, S-polarized light on the forward path to the optical disc 200 is emitted from the QWP 8 as, for example, P-polarized laser light 300 on the return path, and the P-polarized laser light 300 is incident on the polarizing member 6. The

  For example, “P” for P-polarized light is an abbreviation for “parallel” in German and means “parallel”. Further, for example, “S” of S polarization with respect to P polarization is an abbreviation of “senkrecht” in German and means “vertical”. P-polarized light and S-polarized light are properly used depending on the design / specifications of the OPU.

  The P-polarized laser beam 300 on the return path substantially passes through the polarizing member 6. The laser beam 300 returned to the polarizing member 6 transmits, for example, the first parallel plate 10I disposed to be tilted so as to correct astigmatism when passing through the polarizing member 6. Further, when the laser beam 300 transmitted through the first parallel plate 10I is transmitted through the second parallel plate 10II disposed in an inclined manner, for example, a non-focus error component of the laser beam 300 irradiated onto the optical disc 200 is obtained. While the point aberration is given and the coma generated by the polarizing member 6 and the first parallel plate 10I is corrected, the laser beam 300 is guided to the photodetector 80. As a result, the photodetector 80 generates a tracking error signal, a focus error signal, and the like based on the laser beam 300 guided from the second parallel plate 10II.

  Depending on the design / specification of the OPU 2A, the first parallel plate 10I and the second parallel plate 10II are, for example, astigmatism elements 10I and 10II. For example, the first astigmatism element 10I and the second astigmatism element 10II are also examples of the condensing optical system of the OPU 2A. Further, in place of the first parallel plate 10I and the second parallel plate 10II, for example, astigmatism of the laser beam 300 is generated and the focusing detection of the focused spot 301 irradiated to the signal layer 210 of the optical disc 200 is not performed. A sensor lens (not shown) such as one anamorphic lens (not shown) that can be detected based on the point aberration method / differential astigmatism method may be used as the astigmatism element.

The OPU 2A is a laser beam 3 reflected from the signal layer 210 of the optical disc 200.
At least one light receiving element for receiving 00, so-called photodetector 80 or PD (photo
detector 80) or PDIC (photo diode IC). The photodetector 80 includes a main light receiving unit 82/87 (FIG. 2) having a substantially rectangular shape in plan view corresponding to a main beam (0th order light) transmitted through a plurality of divided diffraction gratings 4 such as a quadrant type, and diffraction. A pair of sub-light-receiving portions 83, 84/88, 89 (FIG. 2) having a substantially rectangular shape in plan view corresponding to a pair of sub-beams (± first-order diffracted light beams) diffracted and branched by passing through the grating 4 (FIG. 1); The three light receiving parts are provided at least. The main light receiving part 82/87 having a substantially rectangular shape in plan view is divided into four substantially equal parts and includes four segments having a substantially rectangular shape in plan view. Further, the sub light receiving portions 83, 84/88, 89 having a substantially rectangular shape in plan view are divided into four substantially equal parts and include four segments having a substantially rectangular shape in plan view. In this manner, the OPU 2A is equipped with the photodetector 80 having each of the plurality of divided type light receiving units provided with a plurality of substantially rectangular segments in plan view. A segment means one of parts divided into several parts, such as a part and a fragment.

  The photodetector 80 receives the laser beam 300 reflected from the signal layer 210 (FIG. 15) of the optical disc 200, converts the signal into an electrical signal, and records data, information, and signals recorded on the signal layer 210 of the optical disc 200. And so on. The photodetector 80 receives the laser beam 300 reflected from the signal layer 210 of the optical disc 200, changes the signal into an electrical signal such as a tracking error signal or a focus error signal, and the OPU 2A (FIGS. 3 to 9). Is configured to operate the servo mechanism of the lens holder 20 with the OBL 11 and 12. When the data / information / signal recorded on the optical disc 200 (FIGS. 1 and 15) is read out or written on the optical disc 200 by the OPU 2A, the optical detector 80 By irradiating each light receiving unit with each laser beam 300, a main information signal of the optical disc 200, a focus error signal and a tracking error signal for the optical disc 200 are detected.

  The OPU 2A includes one first main light receiving unit 82 (FIG. 2) irradiated with one first main beam, and two first sub light receiving units 83 and 84 irradiated with two first sub beams. , A second main light receiving portion 87 irradiated with one second main beam, and two second sub light receiving portions 88 irradiated with two second sub beams. , 89 and a second light receiving area 86 provided with a photodetector 80.

  In the same light receiving surface portion 85 of the photodetector 80, a first light receiving area 81 used for recording / reproducing of the CD standard optical disc 200, for example, a CD light receiving area 81, and a second used for recording / reproducing of the DVD standard optical disc 200 are used. The light receiving areas 86, for example, the DVD light receiving areas 86 are arranged side by side.

  A CD main light-receiving part 82 and sub-light-receiving parts 83 and 84, each of which is divided into four substantially in the shape of a cross by two perpendicular lines and each comprising four light detection surface parts, are arranged, for example, in three vertical rows. Thus, a CD light receiving region 81 is formed in the photodetector 80. Reflected laser beams of the 0th-order diffracted laser beam, the + 1st-order diffracted laser beam, and the −1st-order diffracted laser beam reflected by the optical disc 200 based on the CD standard on the CD main light receiving unit 82 and the sub light receiving units 83 and 84, respectively. Is received. Laser light based on the CD standard to which astigmatism is given by, for example, an astigmatism generation optical system is received in the CD light receiving region 81 of the photodetector 80. The dividing lines 82x and 82y of the CD main light receiving unit 82 of the photodetector 80 and the dividing lines 83x, 83y and 84x and 84y of the sub light receiving units 83 and 84 are directions in which astigmatism of the received laser light occurs. Are set to have an angle of approximately 45 °.

In addition, a DVD main light receiving portion 87 and sub light receiving portions 88 and 89, each of which is divided into four substantially in a cross shape by two dividing lines orthogonal to each other and each including four light detection surface portions, are arranged, for example, three vertically. The DVD light receiving area 86 is configured in the photodetector 80. DV
Reflected laser beams of the 0th-order diffracted laser beam, the + 1st-order diffracted laser beam, and the -1st-order diffracted laser beam reflected on the D main light receiving portion 87 and the sub light receiving portions 88 and 89 by the optical disc 200 based on the DVD standard Is received. Laser light based on the DVD standard to which astigmatism is given by, for example, an astigmatism generation optical system is received in the DVD light receiving region 86 of the photodetector 80. The dividing lines 87x and 87y of the DVD main light receiving unit 87 of the photodetector 80 and the dividing lines 88x, 88y and 89x and 89y of the sub light receiving units 88 and 89 are directions in which astigmatism of the received laser light occurs. Are set to have an angle of approximately 45 °.

  In the CD light receiving region 81 of the photodetector 80 constituting the OPU 2A, three beams obtained by diffracting and branching the first laser light 300 compliant with the CD standard by the diffraction grating 4, specifically, a main beam (0th order light) Corresponding to each of the two sub-beams (± first-order diffracted light beams) arranged before and after the main beam, and the first main light-receiving portion 82 and the two first sub-light-receiving portions 83 and 84, Is formed. The definitions of “front” and “rear” in the present application are definitions for convenience. The first main light receiving part 82 and the first sub light receiving parts 83 and 84 are each divided into four parts and are constituted by four light detection surface parts.

  More specifically, the first main light receiving portion 82 in the center of the CD light receiving area 81 having a substantially rectangular shape is divided into four by two substantially orthogonal dividing lines 82x and 82y, and the light having four substantially rectangular shapes. The detection surface portions 82a, 82b, 82c, and 82d are configured to include so-called segments 82a, 82b, 82c, and 82d. The first main light receiving portion 82 in the center of the CD light receiving area 81 having a substantially rectangular shape has a first main segment 82a having a substantially rectangular shape and a second shape having a substantially rectangular shape adjacent to the first main segment 82a. A main segment 82b, a third main segment 82c having a substantially rectangular shape adjacent to the second main segment 82b, a fourth main segment 82d having a substantially rectangular shape adjacent to the third main segment 82c, The first main segment 82a is adjacent to the fourth main segment 82d. The first main light receiving portion 82 in the center of the CD light receiving area 81 is configured in a substantially square shape.

  Further, the front side first sub light receiving portion 83 having a substantially rectangular shape in the CD light receiving region 81 is divided into four by two substantially perpendicular dividing lines 83x and 83y, and four light detection surface portions having a substantially rectangular shape. 83a, 83b, 83c, 83d are provided with so-called segments 83a, 83b, 83c, 83d. The front side first sub light receiving portion 83 having a substantially rectangular shape in the CD light receiving region 81 includes a first sub segment 83a having a substantially rectangular shape and a second shape having a substantially rectangular shape adjacent to the first sub segment 83a. A sub-segment 83b, a third sub-segment 83c having a substantially rectangular shape adjacent to the second sub-segment 83b, a fourth sub-segment 83d having a substantially rectangular shape adjacent to the third sub-segment 83c, The first sub-segment 83a is adjacent to the fourth sub-segment 83d. The first sub light receiving portion 83 on the front side of the CD light receiving region 81 is configured in a substantially square shape.

  The first sub light receiving portion 84 on the rear side of the CD light receiving area 81 having a substantially rectangular shape is divided into four by two substantially perpendicular dividing lines 84x and 84y, thereby detecting light having four substantially rectangular shapes. Surface portions 84a, 84b, 84c, 84d are provided with so-called segments 84a, 84b, 84c, 84d. The first sub light receiving portion 84 on the rear side of the CD light receiving area 81 having a substantially rectangular shape has a first sub segment 84a having a substantially rectangular shape and a first rectangular shape adjacent to the first sub segment 84a. A second sub-segment 84b, a third sub-segment 84c having a substantially rectangular shape adjacent to the second sub-segment 84b, and a fourth sub-segment 84d having a substantially rectangular shape adjacent to the third sub-segment 84c; The first sub-segment 84a is adjacent to the fourth sub-segment 84d. The first sub light receiving portion 84 on the rear side of the CD light receiving region 81 is configured in a substantially square shape.

By performing a predetermined calculation on each light receiving output obtained from each segment constituting the first main light receiving unit 82 and the first sub light receiving units 83 and 84, when recording / reproducing the CD standard optical disc 200, etc. A main information signal, a focus error signal FE1, and a tracking error signal TE1 are obtained. The first main light receiving unit 82 and the first sub light receiving units 83 and 84 are not limited to four divisions, and may be, for example, two divisions. Further, the first sub light receiving parts 83 and 84 may not be divided, for example.

  For example, when the first laser beam 300 conforming to the CD standard is irradiated onto the optical disc 200, the tracking error signal TE1 is detected as follows.

  The main beam for CD forming the main detection light spot 302 corresponding to the CD standard is reflected from the signal layer 210 of the optical disc 200, and the main detection light spot 312 is reflected on the main light receiving portion 82 in the CD light receiving region 81 of the photodetector 80. The subtracter (not shown) connected to the main light receiving unit 82 calculates a difference between output signals from the main light receiving unit 82 and generates, for example, a main push-pull signal TEa1.

  Further, the first sub beam for CD forming the first sub detection light spot 303 corresponding to the CD standard is reflected from the signal layer 210 of the optical disc 200, and one of the first sub light beams in the CD light receiving region 81 of the photodetector 80 is reflected. When the one sub light receiving unit 83 is irradiated as the first sub detection light spot 313, the subtracter (not shown) connected to one of the first sub light receiving units 83 has one first sub light receiving unit. The difference between the output signals from 83 is calculated and generated, for example, as the preceding sub push-pull signal TEb1.

  In addition, the second sub beam for CD forming the second sub detection light spot 304 corresponding to the CD standard is reflected from the signal layer 210 of the optical disc 200, and the other second light beam in the CD light receiving region 81 of the photodetector 80 is reflected. When one sub light receiving unit 84 is irradiated as the second sub detection light spot 314, the subtracter (not shown) connected to the other first sub light receiving unit 84 is connected to the other first sub light receiving unit 84. The difference between the output signals from 84 is calculated and generated, for example, as a delayed sub push-pull signal TEc1.

  Detected from the main push-pull signal TEa1 detected from the central main detection light spot 312 corresponding to the central main spot 302 and the front and rear sub detection light spots 313 and 314 corresponding to the front and rear sub spots 303 and 304, respectively. The sub push-pull signals TEb1 and TEc1 are output in opposite phases. Thereafter, the sub push-pull signals TEb1 and TEc1 are added by the adder 106, and the added sub push-pull signal TEd1 generated by the addition is amplified by the amplifier 107 with, for example, an amplification factor G, and then the subtractor 108 By performing a subtraction process on the push-pull signal TEa1, it is possible to generate a highly accurate tracking error signal TE1 in which the offset components of the push-pull signals TEa1, TEb1, TEc1, and TEd1 are canceled. The amplification factor G amplified by the amplifier 107 is a value determined to adjust the difference in light intensity between 0th order light and ± 1st order diffracted light, for example, due to the diffraction efficiency of the diffraction grating 4.

  In the DVD light receiving region 86 of the photodetector 80 constituting the OPU 2A, three beams obtained by diffracting and branching the second laser light 300 compliant with the DVD standard by the diffraction grating 4, specifically, a main beam (0th order light) And a second main light receiving portion 87 and second sub light receiving portions 88 and 89 corresponding to each of the two sub beams (± first order diffracted light beams) arranged before and after the main beam. Is done. The second main light receiving unit 87 and the second sub light receiving units 88 and 89 are divided into four parts, each having four segments.

More specifically, the second main light receiving portion 87 in the center of the DVD light receiving region 86 having a substantially rectangular shape is divided into four segments by two substantially perpendicular dividing lines 87x and 87y, resulting in four substantially rectangular segments. 87a, 87b, 87c, 87d are provided. The second main light receiving portion 87 in the center of the DVD light receiving area 86 having a substantially rectangular shape has a first main segment 87a having a substantially rectangular shape and a second shape having a substantially rectangular shape adjacent to the first main segment 87a. A main segment 87b, a third main segment 87c having a substantially rectangular shape adjacent to the second main segment 87b, a fourth main segment 87d having a substantially rectangular shape adjacent to the third main segment 87c, The first main segment 87a is adjacent to the fourth main segment 87d. The second main light receiving portion 87 at the center of the DVD light receiving region 86 is configured in a substantially square shape.

  Further, the front-side second sub light receiving portion 88 having a substantially rectangular shape in the DVD light receiving region 86 is divided into four by two substantially perpendicular dividing lines 88x and 88y, and four segments 88a having a substantially rectangular shape, 88b, 88c, 88d are provided. The front side second sub light receiving portion 88 having a substantially rectangular shape in the DVD light receiving area 86 has a first sub segment 88a having a substantially rectangular shape and a second shape having a substantially rectangular shape adjacent to the first sub segment 88a. A sub-segment 88b, a third sub-segment 88c having a substantially rectangular shape adjacent to the second sub-segment 88b, a fourth sub-segment 88d having a substantially rectangular shape adjacent to the third sub-segment 88c, The first sub-segment 88a is adjacent to the fourth sub-segment 88d. The second sub light receiving portion 88 on the front side of the DVD light receiving area 86 is formed in a substantially square shape.

  In addition, the second sub light receiving portion 89 on the rear side of the DVD light receiving region 86 having a substantially rectangular shape is divided into four by two substantially perpendicular dividing lines 89x and 89y, thereby providing four substantially rectangular segments 89a. , 89b, 89c, 86DVD. The second sub light receiving portion 89 on the rear side of the DVD light receiving area 86 having a substantially rectangular shape has a first sub segment 89a having a substantially rectangular shape and a first rectangular shape having a substantially rectangular shape adjacent to the first sub segment 89a. A second sub-segment 89b, a third sub-segment 89c having a substantially rectangular shape adjacent to the second sub-segment 89b, and a fourth sub-segment 89d having a substantially rectangular shape adjacent to the third sub-segment 89c The first sub-segment 89a is adjacent to the fourth sub-segment 89d. The second sub light receiving portion 89 on the rear side of the DVD light receiving region 86 is formed in a substantially square shape.

  Recording on the DVD standard optical disc 200 is performed by performing a predetermined calculation on each light receiving output obtained from each segment constituting the second main light receiving unit 87, the second sub light receiving unit 88, and the second sub light receiving unit 89. / A main information signal, a focus error signal FE2, and a tracking error signal TE2 are obtained during reproduction or the like. The second main light receiving unit 87 and the second sub light receiving units 88 and 89 are not limited to four divisions, and may be, for example, two divisions. Further, the second sub light receiving portions 88 and 89 may not be divided, for example.

  For example, when the second laser beam 300 compliant with the DVD standard is irradiated onto the optical disc 200, the tracking error signal TE2 is detected as follows.

  The main beam for DVD forming the main detection light spot 302 corresponding to the DVD standard is reflected from the signal layer 210 of the optical disc 200, and the main detection light spot 317 is reflected on the main light receiving portion 87 in the DVD light receiving region 86 of the photodetector 80. The subtracter (not shown) connected to the main light receiving unit 87 calculates a difference between output signals from the main light receiving unit 87 and generates, for example, a main push-pull signal TEa2.

In addition, the first sub beam for DVD forming the first sub detection light spot 303 corresponding to the DVD standard is reflected from the signal layer 210 of the optical disc 200, and one of the first sub light beams in the DVD light receiving region 86 of the photodetector 80 is reflected. The first sub detection light spot 318 is placed on the second sub light receiving portion 88.
A subtracter (not shown) connected to one of the second sub light receiving units 88 calculates a difference between output signals from one of the second sub light receiving units 88, for example, a preceding sub push-pull. Generated as signal TEb2.

  Further, the second sub beam for DVD forming the second sub detection light spot 304 corresponding to the DVD standard is reflected from the signal layer 210 of the optical disc 200, and the other second beam in the DVD light receiving region 86 of the photodetector 80 is reflected. When the second sub light receiving unit 89 is irradiated as the second sub detection light spot 319, the subtracter (not shown) connected to the other second sub light receiving unit 89 is connected to the other second sub light receiving unit 89. The difference between the output signals from 89 is calculated and generated as, for example, a delayed sub push-pull signal TEc2.

  Detected from the main push-pull signal TEa2 detected from the central main detection light spot 317 corresponding to the central main spot 302 and the front and rear sub detection light spots 318 and 319 corresponding to the front and rear sub spots 303 and 304, respectively. The sub push-pull signals TEb2 and TEc2 are output in opposite phases. Thereafter, the sub push-pull signals TEb2 and TEc2 are added by the adder 106, and the added sub push-pull signal TEd2 generated by the addition is amplified by the amplifier 107 with an amplification factor G, for example, and then the subtractor 108 By performing a subtraction process on the push-pull signal TEa2, it is possible to generate a highly accurate tracking error signal TE2 in which the offset components of the push-pull signals TEa2, TEb2, TEc2, and TEd2 are canceled.

  The signal generated by the photodetector 80 is sent to the central processing unit 110 (FIG. 15) for calculation, and the signal generated by the central processing unit 110 is sent to the coil drive circuit unit 150. When an electric signal is passed through the coil drive circuit unit 150, the OBL 11/12 is moved. The tracking error signal TE generated by the central processing unit 110 is sent to the coil drive circuit unit 150, and the tracking adjustment of the OBL 11/12 (FIGS. 1, 3 to 9) with respect to the track 212 (FIG. 2) of the optical disc 200 is performed. Done automatically.

  Further, the OPU 2A (FIG. 3) has a substantially rectangular flat plate-like top wall 21 and four substantially rectangular flat plate-like side walls 22, 23, 24, 25 substantially orthogonal to the top wall 21. The two OBLs 11 and 12 are provided with a lens holder 20 made of a synthetic resin having a two-piece structure in a substantially rectangular box shape that is mounted on a top wall 21 having a substantially rectangular flat plate shape. For example, a pair of front and rear side walls 22 and 25 having a substantially rectangular flat plate shape face each other substantially in parallel, and a pair of left and right side walls 23 and 24 having a substantially rectangular flat plate shape face each other substantially in parallel. A pair of left and right side walls 23, 24 are positioned substantially orthogonal to the side walls 22, 25, and the top wall 21 is a substantially rectangular flat plate that is substantially orthogonal to the side walls 22, 23, 24, 25. Is positioned above each of the side walls 22, 23, 24, 25, thereby forming a lens holder 20 having a substantially rectangular box shape.

  Further, the OPU 2A constitutes a differential actuator 50 for driving the lens holder 20 having a plurality of OBLs 11 and 12, and both side walls 22 of substantially rectangular horizontally long flat plates facing each other of the lens holder 20 having a substantially rectangular box shape. , 25 are attached to front and rear, left and right paired substantially at both ends 26, 27, and the lens holder 20 having a plurality of OBLs 11, 12 is driven substantially along the optical axis direction Df of the OBLs 11, 12, and substantially along the swing direction Dt. A first focus / tilt coil 31 having a substantially rectangular ring shape and a second focus / tilt coil 32 having a substantially rectangular ring shape arranged substantially in parallel with the first focus / tilt coil 31 having a substantially rectangular shape. For example, a conventional focus coil and a conventional tilt coil are integrated to form, for example, a first focus / tilt coil 31 having both the functions of a conventional focus coil and the functions of a conventional tilt coil. Further, for example, a conventional focus coil and a conventional tilt coil are integrated to form, for example, a second focus / tilt coil 32 having both the functions of the conventional focus coil and the conventional tilt coil.

  Further, the OPU 2A constitutes a differential actuator 50 for driving the lens holder 20 having a plurality of OBLs 11 and 12, and is formed in a substantially central portion of the opposite side walls 22 and 25 of the lens holder 20 having a substantially rectangular box shape. A lens holder having a plurality of OBLs 11 and 12 that are mounted in a pair on the front and rear sides of the first focus / tilt coil 31 having a substantially rectangular ring shape and a second focus / tilt coil 32 having a substantially rectangular ring shape. A substantially rectangular annular tracking coil 33 that drives the optical disk 20 along the radial direction Dr of the optical disk 200 is provided.

  Here, each direction will be described. For example, the focus direction Df that is substantially along the optical axis direction Df of the OBLs 11 and 12 is the first direction. In addition, the tracking direction Dr that is substantially along the radial direction Dr of the optical disc 200 is, for example, the second direction. In addition, a tilt direction Dt that is a direction substantially along the swing direction Dt of the lens holder 20 or the like having the OBLs 11 and 12 is the third direction, for example. Further, a tangential direction Dc, which is a direction orthogonal to the focus direction Df and the tracking direction Dr, is a so-called tangential direction Dc, for example, as the fourth direction. In addition, the definition of each direction and the like in this specification is a definition for convenience for explaining the OPU 2A corresponding to the various optical disks 200, the optical disk apparatus 1A including the OPU 2A in which the various optical disks 200 are housed, and the like.

  A material including a light metal such as an aluminum material or an aluminum alloy material is used to form the wires constituting the coils 31, 32, and 33. Also, a copper clad aluminum wire (CCAW: Copper-Clad Aluminum Wire) is used which is made of a copper clad aluminum wire that is easy to reduce in weight, and is coated with an insulating material such as enamel. Each drive coil 31, 32, 33 is configured. The fusible enamel CCAW is made of an insulating material such as aluminum and aluminum alloy material constituting the conductor main part, a copper material constituting the outer layer part of the conductor main part, and an enamel material constituting the outer peripheral part of the copper material. And a fusing material (both not shown). The film formed of the insulating material is formed using, for example, polyurethane resin, B-type soldering enamel resin, soldering polyesterimide resin, or the like. Further, the film made of the fusion material is formed using, for example, an alcohol adhesive resin, a hot air adhesive resin, or the like. As an element wire for coils containing light metals, such as aluminum material or aluminum alloy material, the Tokyo special electric wire company make: Enamelled copper clad aluminum wire etc. are mentioned, for example.

  Depending on the design / specifications of the OPU 2A, for example, other forms of coils (not shown) may be used instead of the coils 31, 32, and 33. For example, as the coil (31, 32, 33), a coil configured by plating a circuit conductor on a substrate including a glass layer portion or a resin layer portion such as an epoxy resin layer portion may be used. For example, a printed coil that is such a coil may be used. By using the print coils (31, 32, 33), the coils (31, 32, 33) can be easily attached to the lens holder (20). By using the coil (31, 32, 33) configured by plating the circuit conductor on the substrate, the work of attaching the coil (31, 32, 33) to the lens holder (20) is easily performed. Since the mounting work of the coils (31, 32, 33) to the lens holder (20) is facilitated, the assembly work of the OPU (2) is easily performed. By assembling the OPU (2) easily, the price of the OPU (2) can be reduced. Examples of the printed coil include FP coil (registered trademark) manufactured by Asahi Kasei Electronics Corporation.

The OPU 2A is mounted on the left and right side walls 23 and 24 of a substantially rectangular flat plate facing each other of the lens holder 20 having a substantially rectangular box shape, and is made of six substantially linear metal members that elastically support the lens holder 20. The support members 61, 62, 63, 64, 65, 66 are provided with so-called substantially linear metal suspension wires 61, 62, 63, 64, 65, 66. For example,
When the lens holder 20 or the like is viewed from the side of the tilt rotation central axis penetrating portion 75 side of the lens holder 20 or the like constituting the OPU 2A, the substantially linear suspension wires 61, 62, 63, 64, 65, and 66 are A tangential direction that is orthogonal to a focus direction Df that is substantially along the optical axis direction Df of the OBLs 11 and 12 and a tracking direction Dr that is approximately along the radial direction Dr of the optical disc 200. Dc, for example, extends substantially along the tilt rotation center axis extending direction Dc. The substantially linear suspension wires 61, 62, 63, 64, 65, 66 are formed using, for example, phosphor bronze or beryllium copper conducting wires.

  Electricity such as a drive signal and a control signal is passed through the six left and right suspension wires 61, 62, 63, 64, 65, 66 mounted on the lens holder 20 of the OPU 2 A, so that the lens holder 20 of the OPU 2 A The six front and rear coils 31, 31, 32, 32, 33, 33 that are installed and connected to the suspension wires 61, 62, 63, 64, 65, 66 so as to be energized are used as drive signals, control signals, and the like. The electricity that flows. As a drive signal and a control signal sent to each coil 31, 31, 32, 32, 33, 33 via each suspension wire 61, 62, 63, 64, 65, 66, for example, a signal by a DC voltage is used.

  The OPU 2A includes a plurality of OBLs 11 and 12, a lens holder 20 having a multi-piece structure, a plurality of first focus / tilt coils 31, a plurality of second focus / tilt coils 32, and a plurality of trackings. An actuator movable main body 70 having a coil 33 and a plurality of the suspension wires 61, 62, 63, 64, 65, 66 is provided.

  When the actuator movable main body 70 is viewed from the side of the tilt rotation central axis penetrating portion 75 side of the actuator movable main body 70 constituting the actuator 50 of the OPU 2A, the actuator movable main body 70 is configured to be substantially symmetrical. At the same time, the actuator movable main body 70 is configured substantially symmetrically in the front-rear direction.

  A substantially rectangular annular front tracking coil 33 is provided at the approximate center of the substantially rectangular horizontally long flat plate-shaped first side wall 22 of the lens holder 20 constituting the actuator movable main body 70, and the front tracking coil 33 is sandwiched therebetween. On both the left and right sides of the front tracking coil 33, a front first focus / tilt coil 31 having a substantially rectangular ring shape and a front second focus / tilt coil 32 having a substantially rectangular ring shape are provided.

  A rear tracking coil 33 having a substantially rectangular ring shape is provided at a substantially center of the substantially rectangular horizontally long flat plate-like second side wall 25 of the lens holder 20 constituting the actuator movable main body 70, and the rear tracking coil. On the left and right sides of the rear tracking coil 33 with the 33 interposed therebetween, a rear first focus / tilt coil 31 having a substantially rectangular ring shape and a rear second focus / tilt coil 32 having a substantially rectangular ring shape are provided. Yes.

  The first focus / tilt coil 31 on the front side, the second focus / tilt coil 32 on the front side, the first focus / tilt coil 31 on the rear side, and the second focus / tilt coil 32 on the rear side are substantially the same. It is configured in a substantially square annular shape having a substantially square shape. Further, the front side tracking coil 33 and the rear side tracking coil 33 are formed in a substantially vertically long, substantially rectangular ring having substantially the same shape.

When it is assumed that the actuator movable main body 70 is seen through from the tilt rotation central axis penetrating portion 75 side of the actuator movable main body 70 constituting the actuator 50 of the OPU 2A, for example, the front first focus / tilt coil 31; The first focus / tilt coil 31 on the rear side substantially overlaps. At that time, the front-side second focus / tilt coil 32 and the rear-side second focus / tilt coil 32 substantially overlap each other. At that time, the front tracking coil 33 and the rear tracking coil 33 substantially overlap each other.

  In addition, three suspension wires 61, 62, 63 on one side are provided in the vicinity of the left side wall 23 of the lens holder 20 constituting the actuator movable main body 70, and the lens constituting the actuator movable main body 70 is provided. Three other suspension wires 64, 65, 66 are arranged near the other side wall 24 on the right side of the holder 20. The three suspension wires 61, 62, 63 on one side and the three suspension wires 64, 65, 66 on the other side are arranged on the lens holder 20 substantially equally on the left and right.

  In addition, a pair of OBLs 11 and 12 are arranged on the top wall 21 of the lens holder 20 constituting the actuator movable main body 70 so as to be substantially equal to the left and right. The pair of OBLs 11 and 12 are positioned approximately in the middle between the first side wall 22 on the front side and the second side wall 25 on the rear side.

  By configuring the actuator movable main body 70 constituting the actuator 50 of the OPU 2A in this way, the actuator movable main body 70 of the OPU 2A actuator 50 having excellent stability and balance is configured. Thereby, for example, the actuator movable main body 70 of the actuator 50 of the OPU 2A having excellent vibration damping properties is configured.

  Further, the OPU 2A includes a magnetic member made of six magnets constituting the actuator 50, for example, a magnet (not shown). Depending on the magnet mounting structure, the design / specifications of the OPU 2A, etc., for example, a permanent magnet material is used to form each magnet. For example, a magnet is formed by using a ferrite magnet that is inexpensive and has a large coercive force and is not easily demagnetized. Also, depending on the magnet mounting structure, OPU2A design / specifications, etc., the magnet used for OPU2A is, for example, an alloy in which an alloying element such as chromium, aluminum, nickel, cobalt, etc. is added to iron or the like, and quenched. By hardening, precipitation hardening, etc., it has a holding force and a permanent magnet characteristic having a high residual magnetic flux density, and a forming process such as a rolling process is possible. Further, for example, a two-pole, one-drive magnet having a positive electrode portion formed on one side of one surface and a negative electrode portion formed on the other side of the one surface side is used. Further, depending on the magnet mounting structure, the design / specifications of the OPU 2A, etc., for example, a one-pole / two-pole magnet or a multi-pole magnetized magnet with two or more poles is used as the magnetic member.

  The OPU 2A includes at least one metal magnetic coupling member so-called a metal yoke (not shown) constituting the actuator 50. “Yoke” means, for example, one that structurally supports magnetic coupling. The “yoke” is supposed to reduce leakage of magnetic force generated from a magnetic member such as a magnet. This yoke is formed as a frame so-called frame yoke having a function as a yoke. “Frame” means, for example, a frame, a framework, or a framework. The frame yoke is formed as a frame having a function as a yoke.

  The OPU 2A includes an actuator fixing main body (not shown) having a plurality of the magnets and the yoke.

  Corresponding to the first focus / tilt coil 31, the second focus / tilt coil 32, and the tracking coil 33, which are arranged substantially symmetrically in the left-right direction, for example, at least two or more magnetic members, preferably three Magnetic members are arranged side by side in a substantially symmetrical manner. Further, for example, at least two or more magnetic members arranged side by side in a substantially symmetrical manner, or three magnetic members, yokes are formed in a substantially symmetrical manner.

  By configuring the actuator fixing main body constituting the actuator 50 of the OPU 2A in this way, the actuator movable main body 70 of the actuator 50 of the OPU 2A is driven stably with a good balance. Thereby, for example, the vibration damping performance of the actuator movable main body 70 constituting the actuator 50 of the OPU 2A is improved.

  The LDD, the LD3 (FIGS. 1 and 15), the suspension wires 61, 62, 63, 64, 65 and 66 (FIGS. 3 to 9), the photodetector 80 (FIG. 15), etc. are flexible, for example. Flexible circuit bodies 93 such as a printed circuit body (FPC: flexible printed circuit), a flexible flat circuit body (FFC: flexible flat circuit / flexible flat cable), etc. It is connected. In the FPC 93, for example, a plurality of circuit conductor portions 95 are printed on an insulating sheet 94 made of an aromatic heat resistant resin such as a wholly aromatic polyimide resin, and a metal foil such as a copper foil is juxtaposed on the insulating sheet 94, for example. A transparent or translucent protective layer 96 made of an aromatic heat-resistant resin such as a wholly aromatic polyimide resin is provided thereon. The FPC 93 is formed as, for example, a flexible thin sheet having a substantially strip shape. By using FPC93 provided with insulating sheet 94 and / or protective layer 96 made of aromatic heat-resistant resin such as wholly aromatic polyimide resin, LDD, LD3 (FIGS. 1 and 15), The suspension wires 61, 62, 63, 64, 65, 66 (FIGS. 3 to 9), the photodetector 80 (FIG. 15), etc. are soldered well. The FPC 93 is configured as, for example, a standardized FPC 93 that can be used in common with other OPUs, for example. Note that polyimide is abbreviated as “PI”, for example.

  As a method for detecting the focusing spot 301 of the optical disc 200 in the OPU 2A, for example, a detection method based on the astigmatism method may be used. The astigmatism method is, for example, a method of detecting the displacement of a focused spot by detecting a point image distortion formed by an optical system having astigmatism. As a focusing detection method, for example, a detection method based on a differential astigmatism method and the like can be cited. The differential astigmatism method is, for example, a method of generating a focus error signal by subtracting a focus error signal generated at a sub spot multiplied by a predetermined coefficient from a focus error signal generated at a main spot, Push-pull leakage is minimized. The focusing detection method of the focused spot 301 in the OPU 2A is, for example, a detection method based on an astigmatism method, a differential astigmatism method, or the like. As the focusing detection method, for example, other detection methods such as Foucault method and knife edge method may be used or used together. Depending on the type of each optical disc 200 and the like, each focusing detection method such as a differential astigmatism method is automatically selected as appropriate.

  Moreover, as a tracking detection method of the condensing spot 301 of the optical disk 200 in OPU2A, the detection method based on the differential push-pull (DPP: differential push-pull) method etc. are mentioned, for example. The differential push-pull method is, for example, a method for detecting the displacement of a focused spot by using a main beam for reading and writing data and two sub beams for detecting a positional deviation correction signal. Further, examples of the tracking detection method include a detection method based on a DPD (Differential Phase Detection) method including a phase difference method and the like. Specifically, as the tracking detection method, for example, a phase difference method based on a phase difference signal detected by the quadrant photodetector 80 can be cited. As the tracking detection method of the focused spot 301 in the OPU 2A, for example, a detection method based on the DPP method, the DPD method, the phase difference method, the heterodyne detection method, or the like is used or used in combination. Further, depending on the type of each optical disc 200, each tracking detection method such as a phase difference method is automatically selected as appropriate. As the tracking detection method, another detection method such as a three beam method may be used.

  The OPU 2A (FIG. 1) includes the actuator movable main body 70, the actuator fixing main body, the LD 3, the diffraction grating 4, the polarizing member 6, the CL 7, the QWP 8, and the reflection mirror. 9, the first parallel plate 10I, the second parallel plate 10II, the first OBL 11, the second OBL 12, and the photodetector 80 (FIGS. 1 and 15). And a differential focus / tilt type OPU 2A that can read and / or write signals to / from the optical disc 200. The OPU 2A (FIG. 1) further includes the coupling lens 5I and the FMD 5II as necessary.

  The OPU 2A (FIG. 14) includes a housing 91 in which various optical system parts, electrical system parts, drive system parts and the like are equipped. The housing means, for example, a box in which an object such as an apparatus or a part is accommodated, a box shape, or something similar to a box. The housing 91 is formed using, for example, a metal material having excellent heat dissipation characteristics or a resin material having excellent sliding characteristics.

  As an optical system component mounted on the housing 91, for example, a laser diode (LD), a half-wave plate (1 / 2λ plate), a wide-band quarter-wave plate with aperture restriction (¼λ plate), a liquid crystal correction element (LCD: liquid crystal device / liquid crystal display), diffractive optical element (DOE: differential optical element), diffraction grating (inline grating), divergent lens, prism, polarizing beam splitter, dichroic filter, collimator lens, beam expander Lens, half mirror, reflect mirror, total reflection mirror, objective lens, front monitor diode, sensor lens, anamorphic lens, intermediate lens, photo detector, etc. . The OPU 2A includes the optical system parts.

  Moreover, as an electric system component equipped in the housing 91, for example, a beam expander including a printed circuit board, a suspension wire, a coil, an actuator, a flexible printed circuit body, a connector, a laser driver, a laser diode, a liquid crystal correction element, a collimator lens, and the like. Examples include a unit, a front monitor diode, and a photodetector. The OPU 2A includes the electrical system parts.

  Further, examples of the drive system components provided in the housing 91 include a beam expander unit including a suspension wire, a coil, a magnet, a yoke, an actuator, an objective lens, a lens holder, a collimator lens, and the like. The OPU 2A includes the drive system parts.

  Various parts such as various optical system parts, electrical system parts, and drive system parts constituting the OPU 2A are mounted on a housing 91 made of metal or synthetic resin.

  The optical disk apparatus 1A can be equipped with any one of the OPUs 2A shown in FIGS. 1, 3 to 9, 14 and the like, for example.

  In addition, the optical disc apparatus 1A (FIG. 15) includes a control unit 100 that performs calculation accurately and quickly. For example, the system control unit 100 of the optical disc apparatus 1 </ b> A constitutes a digital signal processor (DSP) 100 that can execute calculations accurately and quickly. Digital means that the state of a substance or a system is expressed by signals such as discrete numbers or characters. The DSP means, for example, a microprocessor mainly specialized in digital signal processing.

  The system control unit 100 of the optical disc apparatus 1A constitutes, for example, a system control microcomputer. The system control microcomputer is, for example, a system controller that means a central processing unit, a microprocessor, a microcomputer, or the like, and is a control unit that performs overall system control in the optical disc apparatus 1A. Each function provided in the system control unit 100 is realized by a so-called program such as software and firmware.

  The system control unit 100 of the optical disc apparatus 1A is equipped with a chip including a digital signal processing circuit unit constituting a DSP, for example. By using a DSP having a digital signal processing circuit unit, for example, high-speed arithmetic processing in the arithmetic unit 110 or the like can be executed. By using a DSP, when signal processing is performed, for example, the SN (signal / noise) ratio is set to about 90 dB (decibel) or more, and the influence of noise is easily avoided, and the ambient temperature depends on the ambient temperature. The influence is also easily suppressed. For this reason, a DSP is used for the system control unit 100 of the optical disc apparatus 1A, so that highly accurate arithmetic processing and the like are performed at high speed.

  In addition, the optical disc apparatus 1A includes a central processing unit 110 so-called CPU (central processing unit) 110 that performs calculation accurately and quickly. For example, the central processing unit 110 may be configured as an MPU (micro processing unit).

  The optical disc apparatus 1A also includes a first storage circuit unit 111 in which programs for causing the CPU 110 of the DSP 100 of the optical disc apparatus 1A to perform various controls, coefficients necessary for the OPU 2A, optimal compensation parameters, and the like are stored. Each function implemented by software or the like is stored in the first storage circuit unit 111 accessible by the CPU 110 of the DSP 100 of the optical disc apparatus 1A. The CPU 110 of the DSP 100 of the optical disc apparatus 1A is configured to perform various controls / operations based on a program stored in the first storage circuit unit 111 such as a flash ROM. “ROM” is an abbreviation for “read-only memory”. As the first memory circuit unit 111, for example, a flash memory is used. The first memory circuit unit 111 is configured as a memory circuit unit, for example.

  The first memory circuit unit 111 will be described in detail. Examples of the first memory circuit unit 111 include a ROM such as an EEROM (Electrically Erasable ROM). ROM means read-only memory. The EEROM is capable of electrically erasing stored information. The EEROM is a so-called nonvolatile memory in which, for example, a battery backup power source is unnecessary.

  The first memory circuit unit 111 will be specifically described. Examples of the first memory circuit unit 111 include a ROM such as an EEPROM (Electronically Erasable and Programmable Read Only Memory). The EEPROM means a ROM whose contents can be electrically rewritten. The EEPROM is a so-called nonvolatile memory. When the EEPROM is changed, a voltage higher than a normal voltage is used. The EEPROM is capable of electrically erasing stored information.

In addition, as the first memory circuit unit 111, for example, a ROM such as an EPROM (Erasable Programmable Read Only Memory) is cited. An EPROM means a ROM that can be erased and written any number of times. EPROM is performed by a special method different from that at the time of reading when the memory is erased.

  In addition, the optical disc apparatus 1A includes a second storage circuit unit 112 capable of storing and deleting various values such as coefficients and optimum compensation parameters input to the CPU 110 of the DSP 100, for example. For example, a RAM (Random Access Memory) is used as the second memory circuit unit 112. The RAM means a storage device that can access data in substantially the same time regardless of the storage location or order. The CPU 110 of the DSP 100 controls the operation of the second memory circuit unit 112 such as a RAM. The second memory circuit unit 112 is used, for example, when temporarily storing various signal data or the like when the CPU 110 of the DSP 100 performs complicated calculations such as signal data.

  The DSP 100 includes, for example, the CPU 110 and a plurality of the storage circuit units 111 and 112, so-called ROM 111 and RAM 112.

  The optical disc apparatus 1A receives the drive / control signal output from the CPU 110 of the DSP 100, and supplies the drive / control signal to the coils 31, 32, 33 (FIGS. 3 to 9) provided in the OPU 2A. The coil drive circuit unit 150 (FIG. 15) includes a so-called driver 150.

  The optical disc apparatus 1A also includes a first focus servo circuit that enables the focus servo operation of the lens holder 20 including the OBLs 11 and 12 to be executed based on a focus error signal generated by a front end processing unit (not shown). The unit 121 (FIG. 16) is provided. More specifically, the optical disc apparatus 1A receives the focus error signal generated by the front end processing unit based on the signal detected by the photodetector 80 and is orthogonal to the signal layer 210 of the optical disc 200. A first focus servo circuit unit 121 that generates a control signal for displacing the OBL 11, 12 mounted on the OPU 2 </ b> A is provided substantially along the optical axis direction Df of the OBL 11, 12. After being generated by the front end processing unit, the focus error signal output from the front end processing unit is input to the first focus servo circuit unit 121. The first focus servo circuit unit 121 is configured using an equalizer. The first focus servo circuit unit 121 is configured as a digital equalizer that can handle digital signals. An equalizer is an electric circuit for processing and adjusting the overall frequency characteristics of a signal such as an audio signal. The equalizer is abbreviated as “EQ”.

  In addition, the optical disc apparatus 1A has a second focus servo circuit that enables a focus servo operation of the lens holder 20 including the OBLs 11 and 12 to be executed based on a focus error signal generated by a front end processing unit (not shown). The unit 122 (FIG. 16) is provided. More specifically, the optical disc apparatus 1A receives the focus error signal generated by the front end processing unit based on the signal detected by the photodetector 80 and is orthogonal to the signal layer 210 of the optical disc 200. A second focus servo circuit unit 122 is provided that generates a control signal for displacing the OBL 11, 12 mounted on the OPU 2 </ b> A substantially along the optical axis direction Df of the OBL 11, 12. After being generated by the front end processing unit, the focus error signal output from the front end processing unit is input to the second focus servo circuit unit 122. The second focus servo circuit unit 122 is configured using an equalizer. The second focus servo circuit unit 122 is configured as a digital equalizer that can handle digital signals.

Further, the optical disk apparatus 1A has a tracking servo circuit unit 123 (FIG. 16) that enables the tracking servo operation of the lens holder 20 including the OBLs 11 and 12 to be executed based on the tracking error signal generated by the front end processing unit. Is provided. More specifically, the optical disc apparatus 1A receives the tracking error signal generated by the front end processing unit based on the signal detected by the photodetector 80, and substantially follows the radial direction Dr of the optical disc 200. A tracking servo circuit unit 123 that generates a control signal for displacing the OBLs 11 and 12 provided in the OPU 2A is provided. After being generated by the front end processing unit, a tracking error signal output from the front end processing unit is input to the tracking servo circuit unit 123. The tracking servo circuit unit 123 is configured using an equalizer. The tracking servo circuit unit 123 is configured as a digital equalizer that can handle digital signals.

  In addition, the optical disc apparatus 1A is configured to adjust the tilt of the OBLs 11 and 12 with respect to the signal layer 210 of the optical disc 200 when the OBLs 11 and 12 of the OPU 2A are tilted. A tilt signal adjustment circuit unit 141 (FIG. 16) is provided. The first focus error signal output from the first focus servo circuit unit 121 and the tracking servo circuit unit when, for example, an angle shift or the like occurs in the OBLs 11 and 12 of the OPU 2A with respect to the signal layer 210 of the optical disc 200. The tracking servo signal output from 123 is matched with the first focus / tilt signal adjustment circuit unit 141. For example, an amplifier is used as the first focus / tilt signal adjustment circuit unit 141. The amplifier is an abbreviation for amplifier and means an amplifier.

  In addition, the optical disc apparatus 1A is configured to adjust the tilt of the angle shift of the OBLs 11 and 12 when, for example, an angle shift occurs in the OBLs 11 and 12 of the OPU 2A with respect to the signal layer 210 of the optical disc 200. A tilt signal adjustment circuit unit 142 (FIG. 16) is provided. The second focus error signal output from the second focus servo circuit unit 122 and the tracking servo circuit unit when, for example, an angular deviation or the like occurs in the OBLs 11 and 12 of the OPU 2A with respect to the signal layer 210 of the optical disc 200. The tracking servo signal output from 123 is matched by the second focus / tilt signal adjustment circuit unit 142. For example, an amplifier is used as the second focus / tilt signal adjustment circuit unit 142.

  In addition, for example, another signal adjustment circuit unit 131 that appropriately adjusts the tracking error signal output from the tracking servo circuit unit 123 and inputs the tracking error signal to the first focus / tilt signal adjustment circuit unit 141 is provided. Depending on the design / specifications of the OPU 2A, the optical disc apparatus 1A including the OPU 2A, etc., for example, the other signal adjustment circuit unit 131 may be omitted without being provided.

  The optical disc apparatus 1A receives the focus control signal output from the first focus servo circuit unit 121, and supplies a drive signal to the first focus / tilt coil 31 provided in the OPU 2A. A drive circuit unit 151 (FIG. 16) is provided. The first focus servo circuit unit 121 outputs a focus control signal for reducing the level of the focus error signal to the first focus / tilt coil drive circuit unit 151 based on the input focus error signal. The focus control signal output from the first focus servo circuit unit 121 is input to the first focus / tilt coil drive circuit unit 151.

  The first focus error signal output from the first focus servo circuit unit 121 and the tracking servo circuit unit when, for example, an angle shift or the like occurs in the OBLs 11 and 12 of the OPU 2A with respect to the signal layer 210 of the optical disc 200. The tracking servo signal output from 123 is combined by the first focus / tilt signal adjustment circuit unit 141 and input to the first focus / tilt coil drive circuit unit 151.

  The first focus / tilt coil drive circuit unit 151 supplies a focus / tilt coil drive signal to the first focus / tilt coil 31. When the spot 301 of the laser beam 300 focused by the OBLs 11 and 12 with respect to the pits constituting the signal layer 210 of the optical disc 200 is about to be shifted along the focus direction Df of the OBLs 11 and 12, etc., the OPU 2A In order to adjust the focus of the OBLs 11 and 12, a focus drive signal is sent from the first focus / tilt coil drive circuit unit 151 to the first focus / tilt coil 31 of the OPU 2 A. The drive circuit is called a driver or the like.

  In addition, the optical disc apparatus 1A receives the focus control signal output from the second focus servo circuit unit 122 and supplies a drive signal to the second focus / tilt coil 32 provided in the OPU 2A. A drive circuit unit 152 (FIG. 16) is provided. The second focus servo circuit unit 122 outputs a focus control signal for reducing the level of the focus error signal to the second focus / tilt coil drive circuit unit 152 based on the input focus error signal. The focus control signal output from the second focus servo circuit unit 122 is input to the second focus / tilt coil drive circuit unit 152.

  The second focus error signal output from the second focus servo circuit unit 122 and the tracking servo circuit unit when, for example, an angular deviation or the like occurs in the OBLs 11 and 12 of the OPU 2A with respect to the signal layer 210 of the optical disc 200. The tracking servo signal output from 123 is combined by the second focus / tilt signal adjustment circuit unit 142 and input to the second focus / tilt coil drive circuit unit 152.

  The second focus / tilt coil drive circuit unit 152 supplies a focus / tilt coil drive signal to the second focus / tilt coil 32. When the spot 301 of the laser beam 300 focused by the OBLs 11 and 12 with respect to the pits constituting the signal layer 210 of the optical disc 200 is about to be shifted along the focus direction Df of the OBLs 11 and 12, etc., the OPU 2A In order to adjust the focus of the OBLs 11 and 12, a focus drive signal is sent from the second focus / tilt coil drive circuit unit 152 to the second focus / tilt coil 32 of the OPU 2 A.

  For example, when the actuator movable main body 70 of the differential actuator 50 constituting the OPU 2A is operated while performing tilt control, the tracking error signal output from the tracking servo circuit unit 123 is moderated by the other signal adjustment circuit unit 131. For example, input to the first focus / tilt signal adjustment circuit unit 141, and there is a difference between the voltage at the first focus / tilt signal adjustment circuit unit 141 and the voltage at the second focus / tilt signal adjustment circuit unit 142. Is done. As a result, the voltage of the first focus / tilt coil drive circuit unit 151 and the first focus / tilt coil 31 following the first focus / tilt signal adjustment circuit unit 141 and the second focus / tilt signal adjustment circuit unit 142 following There is a difference between the voltages of the two focus / tilt coil drive circuit unit 152 and the second focus / tilt coil 32. In this way, there is a certain potential difference between the voltage applied to the first focus / tilt coil 31 of the actuator movable main body 70 and the voltage applied to the second focus / tilt coil 32 of the actuator movable main body 70. Generated. As a result, the actuator movable main body 70 of the differential actuator 50 is tilted by the tilt angle corresponding to the potential difference.

This optical disk apparatus 1A has, for example, any one of the OPU 2A shown in FIGS. 1, 3 to 9, FIG. 14, etc., the CPU 110 (FIG. 15), the ROM 111, and the RAM 112, and the calculation is accurate and quick. And the first focus servo circuit section 12.
1 (FIG. 16), the second focus servo circuit section 122, the tracking servo circuit section 123, the other signal adjustment circuit section 131, the first focus / tilt signal adjustment circuit section 141, and the first The second focus / tilt signal adjustment circuit unit 142, and the driver 150 (FIG. 15) having the first focus / tilt coil drive circuit unit 151 and the second focus / tilt coil drive circuit unit 152 are configured. The

  Next, the OPU 2A and the optical disc apparatus 1A that can execute the attitude control of the actuator movable main body 70 of the differential actuator 50 and the control methods thereof using an algorithm will be described. The algorithm means, for example, a calculation procedure or a processing procedure.

  As described above, the differential focus / tilt type OPU 2 A includes at least the plurality of coils 31, 32, and 33 constituting the actuator movable main body 70 of the differential actuator 50.

  The control method of the OPU 2A / optical disc apparatus 1A for executing the attitude control of the actuator movable main body 70 of the differential actuator 50 constituting the OPU 2A using the differential focus / tilt type OPU 2A configured as described above is as follows. It is done as follows.

  For example, after each drive signal is calculated using an algorithm, each drive signal is input to the differential focus / tilt type OPU 2A. Thereby, the occurrence of each of the above problems is avoided.

  An algorithm is used to calculate a drive signal sent to the differential actuator 50 of the OPU 2A. Based on the algorithm, a drive signal sent to the first focus / tilt coil 31 of the actuator movable main body 70 of the differential actuator 50 constituting the OPU 2A is calculated. Further, based on the algorithm, the drive signal sent to the second focus / tilt coil 32 of the actuator movable main body 70 of the differential actuator 50 constituting the OPU 2A is calculated. Further, based on the algorithm, a drive signal sent to the tracking coil 33 of the actuator movable main body 70 of the differential actuator 50 constituting the OPU 2A is calculated.

  Each drive signal calculated by using an algorithm is input to the differential focus / tilt type OPU 2A, so that, for example, the individual differential actuators 50 constituting the differential focus / tilt type OPU 2A are manufactured. Occurrence of, for example, an IO failure in the actuator movable main body portion 70 of the OPU 2A caused by the error in is avoided. Or, during the operation of the differential actuator 50 of the OPU 2A, the occurrence of rolling of the actuator movable main body 70 including the plurality of coils 31, 32, 33 is avoided. An algorithm is added to the driving program X for driving the OPU 2A, and the calculation of each driving signal is performed using the algorithm, thereby avoiding the occurrence of each problem.

  In this specification, IO (incremental object) means, for example, a static inclination generated in an object when a force is slowly applied to the object. In addition, rolling in this specification means a resonance state when the rolling natural frequency is set, for example.

An algorithm for operating the actuator 50 including the coils 31, 32, 33, etc. will be described in detail below. A so-called basic matrix for transmitting a distribution of general drive signals FO1, FO2, TR used when driving the actuator 50 of the differential focus / tilt type OPU 2A is determined based on the following equation (A).
The following equation (A) is, for example, a matrix equation or a determinant.

  Based on the above formula (A), the drive signal FO1 sent to the first focus / tilt coil 31 of the actuator movable main body 70 of the differential actuator 50 is calculated. Further, based on the above formula (A), the drive signal FO2 sent to the second focus / tilt coil 32 of the actuator movable main body 70 of the differential actuator 50 is calculated. Further, based on the above formula (A), the drive signal TR sent to the tracking coil 33 of the actuator movable main body 70 of the differential actuator 50 is calculated.

  By performing the calculation based on the above formula (A), the IO failure of the actuator movable main body 70 of the OPU 2A, the occurrence of rolling of the actuator movable main body 70 in the OPU 2A, and the like are avoided. By using the compensation algorithm based on the above formula (A) in the driving program X for driving the OPU 2A in order to optimally distribute the driving force in the three directions of the focus direction Df, the tracking direction Dr, and the tilt direction Dt, The drive signals FO1, FO2, TR sent to the differential actuator 50 of the OPU 2A are calculated. Based on the above formula (A), a drive signal FO1 sent to the first focus / tilt coil 31 of the actuator movable main body 70 of the differential actuator 50, a drive signal FO2 sent to the second focus / tilt coil 32, Since the drive signal TR sent to the tracking coil 33 is calculated, the occurrence of each of the above problems is avoided.

  The optical disc apparatus 1A includes, for example, any one of the OPU 2A shown in FIGS. 1, 3 to 9, 14 and the like, the CPU 110 (FIG. 15), the ROM 111, and the RAM 112, and the formula (A). The DSP 100 that performs the calculation based on the above accurately and quickly and the driver 150 are provided.

  The control method of the optical disk apparatus 1A for executing the attitude control of the actuator movable main body 70 of the differential actuator 50 (FIGS. 3 to 9) constituting the OPU 2A using the optical disk apparatus 1A configured as described above is as described above. This is performed based on the formula (A).

For example, the focus error signal FE, the tracking error signal TE, and the corrected tilt amount signal TILT are input to the software X (FIG. 17), and the above formula (A
), The drive signals FO1, FO2, and TR are output.

  By configuring the optical disc apparatus 1A including the DSP 100 that performs the calculation based on the formula (A) accurately and quickly, and executing the control method of the optical disc apparatus 1A that performs the calculation process of the formula (A) by the software X, For example, in the individual differential actuators 50 constituting the differential focus / tilt type OPU 2A, occurrence of, for example, an IO failure in the actuator movable main body 70 of the OPU 2A due to an error in the manufacturing process is avoided.

  Or, during the operation of the differential actuator 50 of the OPU 2A, the actuator movable having the coils 31, 32, 33 such as the OBL 11, 12, the first focus / tilt coil 31, the second focus / tilt coil 32, the tracking coil 33, etc. Occurrence of rolling of the main body 70 is avoided. The compensation program based on the above formula (A) is added to the driving program X for driving the OPU 2A, and the calculation of each drive signal FO1, FO2, TR is performed using the compensation algorithm. It is possible to provide the optical disc apparatus 1A and the control method thereof.

  The calculation based on the above formula (A) is performed accurately and quickly by the DSP 100 of the optical disc apparatus 1A. Accordingly, it is possible to provide the optical disc apparatus 1A in which the IO characteristics of the actuator movable main body 70 of the OPU 2A and the rolling suppression characteristics of the actuator movable main body 70 of the OPU 2A are compensated, and the control method thereof.

  Next, the OPU 2A, the optical disc apparatus 1A, and control methods thereof will be described more specifically.

  FIG. 3 shows the first focus / tilt coil 31 and the second focus / tilt coil when the actuator movable main body 70 is viewed from the side of the tilt rotation central axis penetrating portion 75 of the actuator movable main body 70 constituting the OPU 2A. Actuator movable main body portion of the actuator 50 of the OPU 2A configured by arranging a plurality of magnetic members (not shown) corresponding to the plurality of coils 31, 32, 33 arranged in parallel with the tracking coil 33 and the tracking coil 33. FIG.

  For example, the OPU 2A (FIG. 1) includes a lens holder 20 having a first OBL 11 (FIG. 3) and a second OBL 12 that squeeze and irradiate various optical disks 200 (FIG. 15) with a laser beam 300, and a plurality of OBLs 11 and 12. The first focus / tilt coil 31 and the second focus / tilt coil 32 that are driven substantially along the optical axis direction Df of the OBLs 11 and 12 and substantially driven along the swing direction Dt, and a plurality of OBLs 11 and 12. And a tracking coil 33 (FIG. 3) for driving the lens holder 20 substantially along the radial direction Dr of the optical disc 200 (FIG. 15), and reading out signals from the optical disc 200 (FIG. 15) and / or It is configured as a differential focus / tilt type OPU2A capable of signal writing

  Using the differential focus / tilt type OPU 2A configured as described above, the OPU 2A (FIGS. 3 and 15) that executes the attitude control of the actuator movable main body 70 of the differential actuator 50 (FIG. 3) constituting the OPU 2A. / The control method of the optical disc apparatus 1A is performed as follows.

First, the drive signal input to the first focus / tilt coil 31 is defined as FO1. Further, the drive signal input to the second focus / tilt coil 32 is defined as FO2. The drive signal input to the tracking coil 33 is defined as TR. A focus error signal detected by a light receiving element such as the photodetector 80 when a defocus of the laser beam 300 substantially along the optical axis direction Df of the OBLs 11 and 12 occurs with respect to the signal layer 210 of the optical disc 200. Is defined as FE. In addition, when the laser beam 300 is defocused substantially along the radial direction Dr of the optical disc 200 with respect to the signal layer 210 of the optical disc 200, a tracking error signal detected by a light receiving element such as the photodetector 80 is TE. It is determined. In addition, when the focal angle shift of the laser beam 300 occurs with respect to the signal layer 210 of the optical disc 200, a correction tilt amount signal for correcting the angle shift of the OBLs 11 and 12 is defined as TILT.

（但し、各式中の係数Ａ１１，Ａ１２，Ａ１３，Ａ１４，Ａ２１，Ａ２２，Ａ２３，Ａ２４，Ａ３１，Ａ３２，Ａ３３，Ａ３４は、任意の数値とされる。） The drive signals FO1, FO2, TR for operating the differential actuator 50 when the respective signals are defined in this way will be described. The drive signal FO1 input to the first focus / tilt coil 31 is expressed by the following formula ( 1). The drive signal FO2 input to the second focus / tilt coil 32 is determined based on the following equation (2). In addition, the drive signal TR input to the tracking coil 33 is determined based on the following expression (3).

(However, the coefficients A11, A12, A13, A14, A21, A22, A23, A24, A31, A32, A33, and A34 in each equation are arbitrary numerical values.)

  The drive signals FO1, FO2, TR determined based on the above formulas (1), (2), and (3) are input to the differential focus / tilt type OPU 2A. In the individual differential actuators 50 constituting the tilt-type OPU 2A, occurrence of, for example, IO failure in the actuator movable main body 70 of the OPU 2A caused by an error in the manufacturing process is avoided. Or, during the operation of the differential actuator 50 of the OPU 2A, the occurrence of rolling of the actuator movable main body 70 having the OBLs 11 and 12 is avoided. When OPU2A is mass-produced, even if "variation" occurs in the performance of the individual differential actuators 50, for example, the above-described OPU2A actuator control method is used to solve each problem that occurs in OPU2A. Is done.

For example, the distribution formula of the normal drive signals FO1, FO2, TR will be described. Each coefficient A13, A14 in the above equation (A) or the above equation (1) of the normal OPU 2A is set to zero (0 (zero)). . Further, the drive signal FO1 in the above equation (1) at that time is determined based on the following equation (4), for example.

Further, the coefficients A23 and A24 in the above formula (A) or the above formula (2) of the normal OPU 2A are set to zero (0). Further, the drive signal FO2 in the above equation (2) at that time is determined based on, for example, the following equation (5).

Further, the coefficients A31, A32, A34 in the above formula (A) or the above formula (3) of the normal OPU 2A are set to zero (0). Further, the drive signal TR in the above equation (3) at that time is determined based on, for example, the following equation (6).

  For example, the electromagnetic force acting on the first focus / tilt coil 31 and the second focus / tilt coil 32 when the actuator movable main body 70 is viewed from the side of the tilt rotation central axis penetrating portion 75 of the actuator movable main body 70 of the OPU 2A. A focus / tilt force point 71 as a force resultant point 71, a tracking force point 72 as a center 72 of electromagnetic force acting on the tracking coil 33, a center of gravity 73 of the actuator movable main body 70, It is preferable that the rotation center portion 74 that is the center portion 74 when the actuator movable main body portion 70 is tilted and rotated substantially coincides with each other.

  However, depending on the design / specification of the OPU 2A, the accuracy of each component constituting the OPU 2A, the assembly accuracy of the OPU 2A, etc., the actuator movable main body 70 is moved from the tilt rotation central axis penetration portion 75 side of the OPU 2A actuator movable main body 70. When viewed from the side, it is difficult to accurately match the focus / tilt force point 71, the tracking force point 72, the center of gravity 73, and the rotation center 74 of the actuator movable main body 70 of the OPU 2A. It was.

  Even in such an OPU 2A, in order to prevent IO failure and rolling from occurring in the actuator movable main body 70 of the OPU 2A of the optical disc apparatus 1A, the direction is substantially along the optical axis direction Df of the OBLs 11 and 12. Corresponding to the triaxial direction of the focus direction Df, the tracking direction Dr that is substantially along the radial direction Dr of the optical disc 200, and the tilt direction Dt that is substantially along the swing direction Dt of the OBLs 11 and 12. A partial change is made to the distribution formula of the normal drive signals FO1, FO2, and TR. For example, a part of the distribution formula is temporarily changed as necessary.

  By doing so, even if, for example, an IO failure occurs in the actuator movable main body 70 of the OPU 2A caused by various errors in the manufacturing process of the OPU 2A, the OPU 2A can be used without being treated as a defective product. Are treated as Thereby, the yield fall of OPU2A is avoided. Since the yield reduction of OPU 2A is avoided, for example, the price of OPU 2A can be reduced. In addition, the price reduction of the optical disc apparatus 1A can be achieved as the yield reduction of the OPU 2A is avoided.

  Further, during the operation of the differential actuator 50 of the OPU 2A, the occurrence of rolling of the actuator movable main body 70 having the OBLs 11 and 12, the coils 31, 32, 33 and the like is avoided. Therefore, it is possible to provide an OPU 2A with improved operating characteristics and a control method thereof. Further, as the operating characteristics of the OPU 2A are improved, it is possible to provide the optical disc apparatus 1A having improved operating characteristics and a control method thereof.

  For convenience, using a double-dotted circle, the focus / tilt force point 71, tracking force point 72, center of gravity 73, rotation center 74 of the OPU 2A actuator movable main body 70 viewed from the side, And the tilt rotation center axis penetration part 75 is shown. In addition, for the sake of convenience, the broken line arrows are used to indicate the forces acting on the coils 31, 32, 33 for driving the actuator movable main body 70 of the OPU 2A and stabilizing the posture of the actuator movable main body 70. It was.

  FIG. 4 shows the electromagnetic force acting on the tracking coil 33 of the actuator movable main body 70 when the actuator movable main body 70 is viewed from the side from the tilt rotation central axis penetrating portion 75 side of the actuator movable main body 70 constituting the OPU 2A. FIG. 5 is an explanatory view showing a state where the tracking force point 72, which is the central portion 72, is located above the center of gravity 73 of the actuator movable main body 70. FIG. 5 shows the tilt of the actuator movable main body 70 that also constitutes the OPU 2A. When the actuator movable main body 70 is viewed from the side from the rotation center shaft penetrating portion 75 side, the tracking force point 72 that is the central portion 72 of the electromagnetic force acting on the tracking coil 33 is the center of gravity of the actuator movable main body 70. FIG. 73 is an explanatory diagram showing a state of being positioned below 73. For convenience, the center of gravity 73 of the actuator movable main body 70 and the tracking force application point 72 are shown separated from each other. However, actually, the center of gravity 73 of the actuator movable main body 70, the tracking force application point 72, and The distance is small.

  The first OBL 11, the second OBL 12, the first focus / tilt coil 31, the second focus / tilt coil 32, the tracking coil 33, and the six suspension wires 61, 62, 63, 64, 65, 66 Are mounted on the lens holder 20 to constitute, for example, an actuator movable main body 70.

  For example, when the actuator movable main body 70 having the OBLs 11 and 12 is driven substantially along the tracking direction Dr that is substantially along the radial direction Dr of the optical disc 200, the tilt rotation center of the actuator movable main body 70 is driven. When the actuator movable main body portion 70 is viewed from the side from the shaft penetrating portion 75 side, the rotation center portion 74 that is the central portion 74 when the actuator movable main body portion 70 is tilt-rotated, and the first focus / tilt coil 31. The focus / tilt force point 71, which is the resultant force point 71 of the electromagnetic force acting on the second focus / tilt coil 32, and the center of gravity 73 of the actuator movable main body 70 are substantially matched, and the actuator movable main body. 70, a center of gravity 73, and a trackin that serves as a center 72 of electromagnetic force acting on the tracking coil 33 When the force point 72 does not match, zero (0) is input to the coefficients A14, A24, A31, A32, and A34 in the above equations (A), (1), (2), and (3). Then, arbitrary numerical values excluding zero are input to the coefficients A11, A12, A21, A22, A33, and arbitrary numerical values excluding zero are input to the coefficients A13, A23. The coefficient A23 with respect to the coefficient A13 at that time is a numerical value that is opposite to the positive and negative values, and the absolute values of the positive number and the negative number at that time are substantially the same.

  Thereby, for example, when the actuator movable main body 70 having the OBLs 11 and 12 of the OPU 2A is driven substantially along the tracking direction Dr which is substantially along the radial direction Dr of the optical disc 200, the OBLs 11 and 12 of the OPU 2A are driven. The occurrence of rolling in the actuator movable main body 70 is avoided.

More specifically, when the actuator movable main body 70 is tilted and rotated when the actuator movable main body 70 is viewed from the side from the tilt rotation central axis penetrating portion 75 side of the actuator movable main body 70, the central portion 74 is formed. Center of rotation of the rotation center portion 74, the focus / tilt force point 71 as a resultant force point portion 71 of the electromagnetic force acting on the first focus / tilt coil 31 and the second focus / tilt coil 32, and the actuator movable main body 70. When the portion 73 is substantially coincident with the center of gravity 73 of the actuator movable main body 70 and the tracking force point 72 that is the central portion 72 of the electromagnetic force acting on the tracking coil 33 is not coincident, the tracking direction Dr When the actuator movable main body 70 having the OBLs 2 and 12 of the OPU 2A is driven substantially along The actuator having the OBLs 11 and 12 of the OPU 2A because the tracking force point 72 is shifted in the vertical direction, that is, along the optical axis direction Df of the OBLs 11 and 12 with respect to the center of gravity 73 of the actuator movable main body 70. When rolling of the movable main body 70 is about to occur, an arbitrary numerical value excluding zero is input to the coefficient A13 of the above formula (A) or the above formula (1), and the above formula (A) or the above formula ( 2
), An arbitrary numerical value excluding zero is input, the coefficient A23 with respect to the coefficient A13 at that time is changed to a positive and negative numerical value, and the absolute values of the positive and negative numbers at that time are substantially matched. The corrected drive signal FO1 is input to the first focus / tilt coil 31 and the corrected drive signal FO2 is input to the second focus / tilt coil 32, and the actuator movable main body 70 having the OBLs 11 and 12 is input. It is avoided that rolling occurs.

If it demonstrates using a specific example, the drive signal FO1 at that time will be defined based on the following Formula (7), for example.

Further, the drive signal FO2 at that time is determined based on the following equation (8), for example.

Further, the drive signal TR at that time is determined based on the following equation (9), for example.

  In the above formula (A) or the above formula (7), the coefficient A13 multiplied by the tracking error signal TE in order to obtain the drive signal FO1 is, for example, −0.1. The numerical value of the coefficient A13 is a reference value. It is said that. In the equation (A) or the equation (8), the coefficient A23 multiplied by the tracking error signal TE to obtain the drive signal FO2 is, for example, +0.1. The numerical value of the coefficient A23 is a reference. Value. Depending on the design / specifications of the OPU 2A and the like, the numerical values input to the coefficients such as the coefficients A13 and A23 and the relationship between the positive numbers and the negative numbers of the coefficients A13 and A23 and the like are appropriately changed.

  FIG. 6 shows a central portion when the actuator movable main body 70 tilts and rotates when the actuator movable main body 70 is viewed from the side from the tilt rotation central axis penetrating portion 75 side of the actuator movable main body 70 constituting the OPU 2A. It is explanatory drawing which shows the state in which the rotation center part 74 made into 74 is located above the tracking applied force point part 72 made into the center part 72 of the electromagnetic force which acts on the tracking coil 33. FIG. For the sake of convenience, the rotation center portion 74 of the actuator movable main body portion 70 and the tracking force application point portion 72 are shown apart from each other, but actually, the rotation center portion 74 of the actuator movable main body portion 70 and the tracking force application force portion 72 are illustrated. The distance from the point portion 72 is small.

For example, when the actuator movable main body 70 having the OBLs 11 and 12 is driven substantially along the tracking direction Dr that is substantially along the radial direction Dr of the optical disc 200, the tilt rotation center of the actuator movable main body 70 is driven. The resultant force of the electromagnetic force acting on the center of gravity 73 of the actuator movable main body 70 and the first focus / tilt coil 31 and the second focus / tilt coil 32 when the actuator movable main body 70 is viewed from the side from the shaft penetrating portion 75 side. The focus / tilt force point portion 71 as the point portion 71 and the tracking force point portion 72 as the central portion 72 of the electromagnetic force acting on the tracking coil 33 are substantially matched, and the tracking force point portion 72 and the actuator A rotation center portion 74 which is a center portion 74 when the movable main body portion 70 is tilted and rotated; If they do not match, zero (0) is input to the coefficients A14, A24, A31, A32, A34 in the above equations (A), (1), (2), and (3), and the coefficients A11, A12 , A21, A22, A33, any numerical value excluding zero is inputted,
Arbitrary numerical values excluding zero are input to the coefficients A13 and A23. The coefficient A23 with respect to the coefficient A13 at that time is a numerical value that is opposite to the positive and negative values, and the absolute values of the positive number and the negative number at that time are substantially the same.

  Thereby, the IO characteristic of the actuator movable main body 70 of the OPU 2A is improved.

  More specifically, when the actuator movable main body 70 is viewed from the side from the tilt rotation central axis penetrating portion 75 side of the actuator movable main body 70, the center of gravity 73 of the actuator movable main body 70 and the first focus / tilt coil 31. And a focus / tilt force point 71 that is a resultant force point 71 of the electromagnetic force acting on the second focus / tilt coil 32 and a tracking force point 72 that is the central part 72 of the electromagnetic force acting on the tracking coil 33. When the tracking force point 72 and the rotation center 74 that is the center 74 when the actuator movable main body 70 is tilted and rotated do not coincide with each other, the tracking force Dr substantially follows along the tracking direction Dr. Tracking when driving an actuator movable main body 70 having OBLs 11 and 12 of OPU2A The pivot center portion 74 of the actuator movable main body portion 70 is displaced in the vertical direction, that is, along the optical axis direction Df of the OBLs 11 and 12 with respect to the force point portion 72, so that the IO of the actuator movable main body portion 70 of the OPU 2A is shifted. When the characteristic is bad, an arbitrary numerical value excluding zero is input to the coefficient A13 of the above formula (A) or the above formula (1), and zero is excluded from the coefficient A23 of the above formula (A) or the above formula (2). By inputting an arbitrary numerical value, the coefficient A23 with respect to the coefficient A13 at that time is set to a positive and negative numerical value, and the absolute value of the positive number and the negative number at that time are substantially matched, thereby the first focus / tilt coil 31. The corrected drive signal FO1 is input to the second focus / tilt coil 32, and the corrected drive signal FO2 is input to the second focus / tilt coil 32. A driving signal FO1 inputted to Tokoiru 31, a difference between the driving signal FO2 inputted to the second focusing / tilting coils 32 are Motasa. Accordingly, the IO characteristics of the actuator movable main body 70 of the OPU 2A are improved.

If it demonstrates using a specific example, the drive signal FO1 at that time will be defined based on the following Formula (10), for example.

Further, the drive signal FO2 at that time is determined based on the following equation (11), for example.

Further, the drive signal TR at that time is determined based on the following equation (12), for example.

  FIG. 7 shows the first focus / tilt coil 31 and the second focus / tilt coil when the actuator movable main body 70 is viewed from the side of the tilt rotation central axis penetrating portion 75 of the actuator movable main body 70 constituting the OPU 2A. The actuator movable main body 70 of the actuator 50 of the OPU 2A configured by arranging the tripolar magnetic members in parallel corresponding to the three coils 31, 32, 33 arranged in parallel with the tracking coil 33 and the tracking coil 33. FIG.

  For example, the first focus / tilt coil 31 and the second focus / tilt coil 32 are positioned at both ends 26 and 27 of the opposite side walls 22 and 25 of the lens holder 20 having a substantially rectangular box shape, and the first A tracking coil 33 is positioned between the one focus / tilt coil 31 and the second focus / tilt coil 32, and the first focus / tilt coil 31, the second focus / tilt coil 32, and the tracking that are arranged side by side. In the actuator 50 of the OPU 2A configured by arranging three pole magnets (not shown) corresponding to the three coils 31, 32, 33 and the coil 33, the tilt movable central axis of the actuator movable main body 70 penetrates. When the actuator movable main body 70 is viewed from the side from the portion 75 side, the first focus / tilt coil 3 A focus / tilt force point 71 that is the resultant force point 71 of the electromagnetic force acting on the second focus / tilt coil 32; a tracking force point 72 that is the central part 72 of the electromagnetic force acting on the tracking coil 33; A case will be described in which the rotation center portion 74 that is the center portion 74 when the actuator movable main body portion 70 is tilt-rotated substantially coincides with the gravity center portion 73 of the actuator movable main body portion 70.

  In such a case, when the actuator movable main body 70 having the OBLs 11 and 12 is driven substantially along the tracking direction Dr which is substantially along the radial direction Dr of the optical disc 200, each of the above formulas (A) In addition, zero is input to the coefficients A31, A32, and A34 of the equations (1), (2), and (3), and arbitrary numerical values other than zero are input to the coefficients A11, A12, A21, A22, and A33. Arbitrary numerical values other than zero are input to the coefficients A13 and A23, the coefficient A23 for the coefficient A13 at that time is a positive and negative numerical value, and the absolute values of the positive and negative numbers at that time are substantially the same. Further, an arbitrary substantially coincident numerical value excluding zero is input to the coefficients A14 and A24.

  Thereby, for example, when the actuator movable main body 70 having the OBLs 11 and 12 of the OPU 2A is driven substantially along the tracking direction Dr which is substantially along the radial direction Dr of the optical disc 200, the OBLs 11 and 12 of the OPU 2A are driven. The occurrence of rolling in the actuator movable main body 70 is avoided.

  For example, the first focus / tilt coil 31 and the second focus / tilt coil 32 are positioned at both ends 26 and 27 of the opposite side walls 22 and 25 of the lens holder 20 having a substantially rectangular box shape, and the first A tracking coil 33 is positioned between the one focus / tilt coil 31 and the second focus / tilt coil 32, and the first focus / tilt coil 31, the second focus / tilt coil 32, and the tracking that are arranged side by side. In the actuator 50 of the OPU 2A in which three pole magnets (not shown) are arranged in parallel corresponding to the three coils 31, 32, 33 with the coil 33, a direction substantially along the radial direction Dr of the optical disc 200. Actuator having the tracking coil 33 of the OPU 2A substantially along the tracking direction Dr. When the movable main body 70 is driven, the first focus / tilt coil 31 and the second focus / tilt coil are substantially along the focus direction Df that is substantially along the optical axis direction Df of the OBLs 11 and 12. There is a concern that an unnecessary driving force may be generated at 32.

However, when driving the actuator movable main body 70 having the OPU 2A OBLs 11 and 12 substantially along the tracking direction Dr, when the actuator movable main body 70 having the OPU 2A OBL 11 and 12 is about to roll, Any zero is applied to the coefficients A11, A12, A21, A22, and A33 by inputting zero into the coefficients A31, A32, and A34 in the above equations (A), (1), (2), and (3). While inputting a numerical value, an arbitrary numerical value excluding zero is input to the coefficients A13 and A23, the coefficient A23 with respect to the coefficient A13 at that time is set to a positive and negative numerical value, and the absolute value of the positive number and the negative number at that time Are further matched, and an arbitrary numerical value excluding zero is input to the coefficient A14 of the above formula (A) or the above formula (1), and the above formula (A) or An arbitrary numerical value excluding zero is input to the coefficient A24 of the above equation (2), and the coefficients A14 and A24 are made to be substantially the same numerical value, so that the drive signal FO1 shown in the above equation (A) or the above equation (1) is obtained. Is input to the first focus / tilt coil 31, and the drive signal FO2 shown in the above formula (A) or (2) is input to the second focus / tilt coil 32, whereby the first focus / tilt coil 31 is input. And the unnecessary driving force generated in the second focus / tilt coil 32 are canceled so as to cancel each other. Therefore, the occurrence of rolling in the actuator movable main body 70 having the OBLs 2 and 12 of the OPU 2A is avoided.

If it demonstrates using a specific example, the drive signal FO1 at that time will be defined based on the following Formula (13), for example.

Further, the drive signal FO2 at that time is determined based on the following equation (14), for example.

Further, the drive signal TR at that time is determined based on the following equation (15), for example.

  In the above equation (A), positive and negative numerical values can be set as numerical values to be input to the coefficients A13 and A23, or as in the above equations (10) and (11) or the above equations (13) and (14). When the numerical values to be inputted to the coefficients A13 and A23 are set as positive and negative numerical values, the IO of the actuator movable main body 70 including the coils 31, 32, 33, the OBLs 11 and 12, the lens holder 20 and the like constituting the actuator 50 is provided. Improved characteristics. Also, if positive and negative numerical values are set as the numerical values to be input to the coefficients A13 and A23, when the tracking driving of the coils 31, 32 and 33 and the lens holder 20 with the OBLs 11 and 12 constituting the actuator 50 is performed, it is appropriate. A rolling moment is applied to the coils 31, 32, 33 and the lens holder 20 with the OBLs 11, 12 constituting the actuator 50. Therefore, IO failures and rolling in the coils 31, 32, 33 and the lens holder 20 with the OBLs 11, 12 constituting the actuator 50 are suppressed.

  FIG. 8 shows a central portion when the actuator movable main body 70 tilts and rotates when the actuator movable main body 70 is viewed from the side from the tilt rotation central axis penetrating portion 75 side of the actuator movable main body 70 constituting the OPU 2A. FIG. 7 is an explanatory diagram showing a state in which a rotation center portion 74, which is 74, is located on the left side of the center of gravity portion 73 of the actuator movable main body portion 70. For the sake of convenience, the rotation center portion 74 of the actuator movable main body 70 and the center of gravity 73 are illustrated separately from each other. The distance is small.

  For example, the center of gravity 73 of the actuator movable main body 70, the tracking force point 72 that is the central portion 72 of the electromagnetic force acting on the tracking coil 33, the first focus / tilt coil 31, and the second focus / tilt coil 32 The focus / tilt force point 71 that is the resultant force point 71 of the electromagnetic force that acts is substantially coincident, and the center 74 when the focus / tilt force point 71 and the actuator movable main body 70 are tilt-rotated. A case where the rotation center portion 74 is not coincident will be described.

  When the actuator movable main body 70 having the OBLs 11 and 12 is driven substantially along the focus direction Df, which is substantially the direction along the optical axis direction Df of the OBLs 11 and 12, the above equations (A) and (1) ), Eq. (2), Eq. (3), zeros are input to the coefficients A13, A14, A23, A24, A31, A32, A34, and arbitrary numerical values other than zero are input to the coefficients A12, A22, A33. Arbitrary numerical values excluding zero are input to the coefficients A11 and A21, and the coefficient A11 is made to have a difference with respect to the coefficient A11 so that the coefficient A11 and the coefficient A21 do not coincide with each other to be a substantially approximate numerical value.

  Thereby, the IO characteristic of the actuator movable main body 70 of the OPU 2A is improved.

  When the actuator movable main body 70 is viewed from the side of the tilt rotation central axis penetrating portion 75 of the actuator movable main body 70, the center of gravity 73 of the actuator movable main body 70 and the central portion 72 of the electromagnetic force acting on the tracking coil 33 are displayed. The tracking force application point portion 72, which is defined, is substantially coincident with the focus / tilt force application point portion 71, which is the resultant force point portion 71 of the electromagnetic force acting on the first focus / tilt coil 31 and the second focus / tilt coil 32, In addition, when the focus / tilt force point 71 does not coincide with the rotation center 74 that is the center 74 when the actuator movable main body 70 tilts and rotates, the OPU 2A of the OPU 2A substantially follows the focus direction Df. When driving the actuator movable main body 70 having the OBLs 11 and 12, the focus / tilt force application point portion 1, when the rotation center portion 74 of the actuator movable main body portion 70 is shifted in the left-right direction, that is, along the radial direction Dr of the optical disc 200, the IO characteristic of the actuator movable main body portion 70 of the OPU 2A is poor. In addition, an arbitrary numerical value excluding zero is input to the coefficient A11 of the above expression (A) or the above expression (1), and an arbitrary numerical value excluding zero is input to the coefficient A21 of the above expression (A) or the above expression (2). The drive is corrected in the first focus / tilt coil 31 by making a difference between the coefficient A11 and the coefficient A11 at that time so that the coefficient A11 and the coefficient A21 do not coincide with each other to be a substantially approximate numerical value. The signal FO1 is input, and the corrected drive signal FO2 is input to the second focus / tilt coil 32. As a result, the first focus / chill is input. A drive signal FO1 to be input to the coil 31, a difference between the driving signal FO2 inputted to the second focusing / tilting coils 32 are Motasa. Accordingly, the IO characteristics of the actuator movable main body 70 of the OPU 2A are improved.

If it demonstrates using a specific example, the drive signal FO1 at that time will be defined based on the following Formula (16), for example.

Further, the drive signal FO2 at that time is determined based on the following equation (17), for example.

Further, the drive signal TR at that time is determined based on the following equation (18), for example.

FIG. 9 shows the tracking coil 3 when the actuator movable main body 70 is viewed from the side of the tilt rotation central axis penetrating portion 75 side of the actuator movable main body 70 constituting the OPU 2A.
3 is located below the center of gravity 73 of the movable actuator main body 70, and the center when the movable actuator main body 70 tilts and rotates. 7 is an explanatory diagram showing a state in which a rotation center portion 74 that is a portion 74 is positioned below the center of gravity 73 and the tracking force application point 72 of the actuator movable main body 70. FIG.

  For the sake of convenience, the tracking force point 72 and the center of gravity 73 of the actuator movable main body 70 are shown separated from each other, but actually, the tracking force point 72 and the center of gravity 73 of the actuator movable main body 70 are shown. The distance is small. Further, for convenience, the rotation center portion 74 of the actuator movable main body portion 70, the gravity center portion 73, and / or the tracking force applying point portion 72 are illustrated as being separated from each other. The distance between the dynamic center portion 74 and the gravity center portion 73 and / or the tracking force application point portion 72 is small.

  FIG. 10 shows the relationship between the rolling frequency and gain generated in the actuator movable main body 70 having the OBLs 2 and 12 of the OPU 2A, and the actuator movable main body 70 having the coils 31, 32, 33 and the like. FIG. 11 shows the relationship between the rolling frequency and gain generated in the actuator movable main body 70 having the OBLs 11 and 12 of the OPU 2A, and the coils 31 and 32. , 33, etc. is a waveform diagram showing a state when the rolling frequency of the actuator movable main body 70 is a high frequency.

  For example, when the actuator movable main body 70 having the OBLs 11 and 12 is driven, when the actuator movable main body 70 is viewed from the side from the tilt rotation central axis penetrating portion 75 side of the actuator movable main body 70, A rotation center portion 74 that is a center portion 74 when the tilt rotation of the 70 is performed, a gravity center portion 73 of the actuator movable main body portion 70, and a tracking force application point portion that is a center portion 72 of electromagnetic force acting on the tracking coil 33. 72, and when the rolling of the actuator movable main body 70 having the OBLs 11 and 12 is about to occur, the above equations (A), (1), (2), and ( 3) Zero is input to the coefficients A31, A32, and A34, and any numerical value excluding zero is set to the coefficients A11, A12, A21, A22, and A33. Arbitrary numerical values excluding zero are input to the coefficients A13 and A23, and arbitrary numerical values excluding zero are input to the coefficients A14 and A24, and depending on the rolling frequency of the actuator movable main body 70 having the OBLs 11 and 12, The numerical values input to the coefficients A13 and A23 are changed.

  By changing the numerical values input to the coefficients A13 and A23 according to the rolling frequency of the actuator movable main body 70 having the OBLs 11 and 12, the actuator movable main body of the OPU 2A is changed by the rolling frequency of the actuator movable main body 70 having the OBLs 11 and 12. The IO characteristic of the unit 70 is compensated, or the rolling suppression characteristic of the actuator movable main body 70 having the OBLs 11 and 12 of the OPU 2A is compensated.

  For example, a case will be described in which a frequency in the vicinity of approximately 200 Hz (hertz) is assumed to be a predetermined frequency that is a boundary frequency between a low frequency of the rolling frequency and a high frequency of the rolling frequency. In this way, for example, when the frequency near about 200 Hz is set as the boundary between the low frequency of the rolling frequency and the high frequency of the rolling frequency, the rolling frequency of the actuator movable main body 70 having the OBLs 11 and 12 is about 200 Hz. When the frequency is lower than the frequency, for example, the IO characteristics of the actuator movable main body 70 of the OPU 2A are compensated. In addition, when the rolling frequency of the actuator movable main body 70 having the OBLs 11 and 12 is set to a high frequency exceeding a frequency near about 200 Hz, for example, the rolling suppression characteristic of the actuator movable main body 70 having the OBLs 2 and 12 of the OPU 2A is compensated. The

  Corresponding to the rolling frequency of the actuator movable main body 70 having the OBLs 11 and 12, the coefficients A13 and A23 are changed as follows. For example, when the rolling frequency generated in the actuator movable main body 70 having the OBLs 11 and 12 is set to a frequency near about 200 Hz, the numerical values input to the coefficients A13 and A23 are set to ± 0.1, for example, with this frequency as a boundary. Change to ± 0.2 mag.

  For example, when compensating the rolling suppression characteristic of the actuator movable main body 70 having the OBLs 11 and 12 of the OPU 2A, for example, +0.1 is input to A13 and −0.1 is input to A23. The values +0.1 and -0.1 at this time are set as, for example, the compensation value Q1. In this case, for example, the following equations (19), (20), and (21) are set by the actuator control device of the OPU 2A.

  For example, when compensating the IO characteristic of the actuator movable main body 70 of the OPU 2A, for example, -0.2 is input to A13 and +0.2 is input to A23. The values of −0.2 and +0.2 at this time are set as a compensation value Q2, for example. In this case, for example, the following equations (22), (23), and (24) are set by the actuator control device of the OPU 2A of the optical disc device 1A.

  For example, the tracking force point 72, the center of gravity 73, and the rotation center 74 of the actuator movable main body 70 including the coils 31, 32, 33, OBL 11, 12, and the lens holder 20 constituting the actuator 50 are matched. If the coefficient A13 of the above formula (A) or the above formula (1) and the coefficient A23 of the above formula (A) or the above formula (2) remain constant at a predetermined numerical value, for example, the conventional actuator (50) In the actuator movable main body (70) including the coils (31, 32, 33), the OBL (11, 12), the lens holder (20) and the like constituting the I / O failure and rolling of the actuator movable main body (70) It was difficult to resolve both occurrences together. In the actuator movable main body portion (70) of the conventional OPU (2A), it is possible to solve only one of IO failure or rolling occurrence, but to solve both IO failure and rolling occurrence together. was difficult.

  However, by providing, for example, a variable frequency characteristic to the coefficient A13 of the above formula (A) or the above formula (1) and the coefficient A23 of the above formula (A) or the above formula (2), the coils 31 constituting the actuator 50, It is possible to solve both the IO failure and the rolling occurrence of the actuator movable main body 70 including the 32, 33, the OBL 11, 12, the lens holder 20, and the like.

  The numerical value input to the coefficient A13 of the above formula (A) or the above formula (1) and the coefficient A23 of the above formula (A) or the above formula (2) is changed depending on the rolling frequency of the actuator movable main body 70 of the OPU 2A. Then, for example, the control method of the OPU 2A / optical disc apparatus 1A for imparting, for example, a variable frequency characteristic to the coefficient A13 of the formula (A) or the formula (1) and the coefficient A23 of the formula (A) or the formula (2) For example, the present invention may be applied when the control method of the OPU 2A / optical disc apparatus 1A shown in FIGS.

  A case where an optimum compensation parameter is set for each actuator 50 will be described.

  At present, for tilt compensation, the tilt command value (TILT command value) is determined by evaluation such as maximization (DPPmax) of differential push-pull (DPP) (FIG. 2). This is because, for example, it corresponds to the optical disc (200) in which “warping” or the like occurs, and the correction tilt amount signal TILT is quasi-steady using, for example, the signal adjustment circuit units 131, 141, 151 (FIG. 16). A voltage is applied to tilt the actuator movable main body 70 including the coils 31, 32, 33 (FIG. 9), the OBLs 11, 12, the lens holder 20, and the like.

  For a regular optical disc 200 (FIG. 1, FIG. 2, FIG. 15) in which “warp” or the like does not occur, for example, frequencies of about 150 Hz, about 200 Hz, etc. The OPU 2A and other tuning tests are performed in two ways, and for example, the compensation value Q1 (FIG. 10), the compensation value Q2 (FIG. 11), etc. can be set for each OPU 2A (FIGS. 3 to 9). The

  By doing so, servo characteristics that compensate for manufacturing variations when the actuator 50 of the OPU 2A is manufactured are ensured, the product characteristics of the OPU 2A are stabilized, and the design flexibility of the OPU 2A is greatly expanded. . Therefore, the performance of the OPU 2A can be further improved.

  Further, by executing the control method of the OPU 2A / optical disc apparatus 1A, it is not necessary to actually wire the tracking coil to the tilt portion as in the conventional example.

  FIG. 12 is a schematic diagram showing a part of the signal path of the OPU 2A. FIG. 13 shows the tilt angle of the lens holder 20 having the OBLs 11 and 12 of the OPU 2A and the OBLs 11 and 12 etc. substantially along the radial direction Dr of the optical disc 200. FIG. 14 is a schematic plan view showing the OPU 2A in which the control method of the OPU 2A / optical disc apparatus 1A is executed.

For example, when the OPU 2A reads / writes data, information, signals, etc. of the optical disc (200) (FIGS. 1, 2 and 15) in which “warp” or the like occurs, the optical disc in which “warp” or the like occurs Corresponding to (200), for example, a quasi-stationary voltage is applied to the first focus / tilt coil 31 (FIGS. 3 to 9 and 12) and the second focus / tilt coil 32 as the corrected tilt amount signal TILT. The lens holder 20 having a plurality of OBLs 11 and 12 tilted by tilt control is inadvertently moved substantially along the tracking direction Dr of the optical disc 200 when the lens holder 20 having the OBLs 11 and 12 is tilted. A shift may occur.

Therefore, when the lens shift occurrence state in which the lens holder 20 having the plurality of tilted OBLs 11 and 12 carelessly moves substantially along the tracking direction Dr of the optical disc 200 is analyzed, the relationship as shown in FIG. It was done. For example, the tilt angle (deg / degree: degree) of the lens holder 20 including the plurality of OBLs 11 and 12 and the lens holder 20 including the plurality of OBLs 11 and 12 move inadvertently along the tracking direction Dr of the optical disc 200. The relationship with the holder movement amount (mm: millimeter) is expressed by a linear function. For example, the tilt angle of the lens holder 20 including the plurality of OBLs 11 and 12 is defined as A, and the movement amount of the lens holder 20 including the plurality of OBLs 11 and 12 substantially along the radial direction Dr of the optical disc 200 is, for example, the holder movement amount. When M is determined, the holder movement amount M is determined based on the following formula (I).
M = C × A (I)
(However, the coefficient C in the formula (I) is an arbitrary numerical value.)

  As described above, the tilt angle A (deg) of the lens holder 20 including the plurality of OBLs 11 and 12 and the lens holder 20 including the plurality of OBLs 11 and 12 are moved inadvertently along the tracking direction Dr of the optical disc 200. The movement amount M (mm) is directly proportional, for example, linear. Each piece of related information such as the above formula (I) is, for example, OPU 2A information, so-called pickup device information.

  More specifically, the tilt angle A (deg) of the lens holder 20 including the plurality of OBLs 11 and 12 when the lens shift occurs, and the lens holder 20 including the plurality of OBLs 11 and 12 substantially follow the tracking direction Dr of the optical disc 200. The relationship with the holder movement amount M (mm) that is inadvertently moved is a linear relationship, for example, a linear relationship, and includes a predetermined inclination value, for example, a coefficient C as shown in FIG. Calculated by function. The linear function information shown in FIG. 13 and the above formula (I) is OPU 2A information, for example, pickup device information, specifically, the lens shift occurrence level of the actuator movable main body 70 constituting the differential actuator 50 of the OPU 2A. The

  Based on this, the lens holder 20 equipped with a plurality of OBLs 11 and 12 (FIGS. 3 to 9 and 12) corresponding to the warp of the optical disc (200) (FIGS. 1, 2 and 15) is provided. When tilting, a predetermined reverse voltage for correction is applied to the tracking coil 33 according to the tilt angle of the lens holder 20 equipped with the plurality of OBLs 11 and 12 (FIGS. 12 and 13), and the radial direction Dr of the optical disc 200 is applied. Is substantially corrected by the amount of movement M of the lens holder 20 including the plurality of OBLs 11 and 12.

  At this time, for example, a predetermined tracking control voltage for driving the actuator movable main body 70 of the differential actuator 50 of the OPU 2A while controlling the track substantially along the tracking direction Dr of the optical disc 200 is simultaneously applied to the tracking coil 33. For example, a predetermined tracking control voltage that is driven while performing track control may not be applied to the tracking coil 33.

  As shown in FIG. 14, the pickup device information such as the coefficient required for the OPU 2A, the optimum compensation parameter, etc. is one-dimensionally displayed on the substantially sheet-shaped information portion 98 with an adhesive attached to the back surface portion 91a of the housing 91 of the OPU 2A. It is printed and stored as a multidimensional code recording unit 98a. Depending on the design / specifications of the OPU 2A, the optical disc apparatus 1A, etc., for example, the linear function information shown in FIG. 13 may be directly set in either or both of the ROM 111 and RAM 112 of the optical disc apparatus 1A (FIG. 15). .

  Next, the disk device 1A and its control method will be described more specifically.

  15 is a block diagram showing the disk device 1A, FIG. 16 is a block diagram showing a part of the servo signal path of the disk device 1A, and FIG. 17 is a diagram showing the drive signals FO1, FO2, and the like in the control unit 100 of the disk device 1A. It is a calculation block diagram which shows the arithmetic processing path | route when calculating TR.

  The optical disc apparatus 1A can be equipped with any one of the OPUs 2A shown in FIGS. 1, 3 to 9, 14 and the like, for example.

  Further, the optical disc apparatus 1A (FIG. 15) has at least one of the above formula (A), the above formula (1), the above formula (2), the above formula (3), and the above formula (I). A DSP 100 is provided for performing the calculation based on the accuracy and speed. For example, the DSP 100 of the optical disc apparatus 1A executes the calculation based on the above formula (A), the above formula (1), the above formula (2), the above formula (3), or the above formula (I) accurately and quickly. It is supposed to be possible. In addition, for example, the system control unit 100 of the optical disc apparatus 1A accurately performs an operation based on any one of the above expressions (1), (2), (3), or (I). It is assumed that the DSP 100 that can be executed quickly is configured. More specifically, the system control unit 100 of the optical disc apparatus 1A performs all the formulas (A), (1), (2), (3), and (I). It is assumed that the DSP 100 is configured to be able to quickly and simultaneously execute operations based on the above.

  In addition, the optical disc apparatus 1A accurately performs an operation based on at least one of the above formula (A), the above formula (1), the above formula (2), the above formula (3), or the above formula (I). The CPU 110 is provided for quick operation.

  The optical disc apparatus 1A receives the drive / control signal output from the CPU 110 of the DSP 100, and supplies the drive / control signal to the coils 31, 32, 33 (FIGS. 3 to 9) provided in the OPU 2A. A driver 150 (FIG. 15) is provided.

  This optical disc apparatus 1A includes, for example, any one of the OPU 2A shown in FIGS. 1, 3 to 9, etc., the above formula (A), the above formula (1), the above formula (2), the above formula (3), Alternatively, the DSP 100 (FIG. 15) that accurately and quickly performs an operation based on at least one of the above formulas (I) and the driver 150 are configured.

  The control method of the optical disk apparatus 1A for executing the attitude control of the actuator movable main body 70 of the differential actuator 50 (FIGS. 3 to 9) constituting the OPU 2A using the optical disk apparatus 1A configured as described above is as described above. This is performed based on at least one of the formula (A), the above formula (1), the above formula (2), the above formula (3), or the above formula (I).

  For example, the focus error signal FE, the tracking error signal TE, and the corrected tilt amount signal TILT are input to the software X (FIG. 17), and the above equation (A), the above equation (1), the above equation (2), Each of the drive signals FO1, FO2, and TR is output by performing calculations based on the above equations (3) and (I).

As described above, the optical disc apparatus 1A including the DSP 100 that performs the calculation based on each formula (A), formula (1), formula (2), formula (3), and formula (I) accurately and quickly is configured. By executing the control method of the optical disc apparatus 1A that performs the arithmetic processing of each formula (A), formula (1), formula (2), formula (3), and formula (I) by X, for example, Tilt-type O
In the individual differential actuators 50 constituting the PU 2A, for example, occurrence of an IO failure in the actuator movable main body 70 of the OPU 2A caused by an error in the manufacturing process is avoided.

  Or, during the operation of the differential actuator 50 of the OPU 2A, the occurrence of rolling of the actuator movable main body 70 having the OBLs 11 and 12 is avoided. As an operation based on at least one of the above formula (A), the above formula (1), the above formula (2), the above formula (3), or the above formula (I), for example, the above formula (A), Or the calculation based on the above formula (1), the above formula (2), the above formula (3), or the above formula (I), the above formula (1), the above formula (2), or the above formula (3). ) Or an arithmetic operation based on any one of the above formulas (I), the above formula (A), the above formula (1), the above formula (2), the above formula (3), and the above formula (I). The calculation based on all the equations (1) is accurately and quickly performed by the DSP 100 of the optical disc apparatus 1A.

  Thereby, it is possible to provide the optical disc apparatus 1A in which the IO characteristics of the actuator movable main body 70 of the OPU 2A and the rolling suppression characteristics of the actuator movable main body 70 having the OBLs 11 and 12 of the OPU 2A are compensated, and the control method thereof.

  For example, when manufacturing variation occurs for each OPU 2A due to differences in the manufacturing site / environment of the OPU 2A, the optimum compensation parameter required for each OPU 2A may vary accordingly. Even if such a situation occurs, the optimum compensation parameter required for each OPU 2A is stored in advance as, for example, OPU 2A component information in the storage circuit unit 111 such as the EEROM 111 of the DSP 100 of the optical disc apparatus 1A including the OPU 2A, and the drive device In the optical disk apparatus 1A such as the above, the optimum compensation parameters stored in advance from the storage circuit unit 111 such as the EEROM 111 are read into the CPU 110 of the DSP 100, so that tuning work such as optimum compensation parameters required for each OPU 2A can be performed. It becomes unnecessary. Therefore, the setting operation of the optimum compensation parameter required for each OPU 2A is easily and quickly performed. The control method of the optical disc apparatus 1A is easily and quickly executed by so-called programs such as software and firmware provided in the DSP 100.

  Next, the OPU 2A and the optical disc apparatus 1A that can execute the attitude control of the actuator movable main body 70 of the differential actuator 50 by using an algorithm and the control methods thereof will be described in more detail.

  As described above, the differential focus / tilt type OPU 2 A includes at least the plurality of coils 31, 32, and 33 constituting the actuator movable main body 70 of the differential actuator 50.

  The control method of the OPU 2A / optical disc apparatus 1A for executing the attitude control of the actuator movable main body 70 of the differential actuator 50 constituting the OPU 2A using the differential focus / tilt type OPU 2A configured as described above is as follows. It is done as follows.

  For example, the algorithm based on at least the above formula (1) and the above formula (2) is used to calculate the drive signals FO1 and FO2 determined based on at least the above formula (1) and the above formula (2). The drive signals FO1 and FO2 are input to the differential focus / tilt type OPU 2A. Thereby, the occurrence of each of the above problems is avoided.

More specifically, when the actuator movable main body 70 of the differential actuator 50 of the OPU 2A is driven, the difference is based on one or both of the focus error signal FE and the tracking error signal TE and / or the corrected tilt amount signal TILT. A compensation algorithm is used for the driving program X for driving the dynamic focus / tilt type OPU 2A, and the driving signals FO1, FO2, TR sent to the differential actuator 50 of the OPU 2A are calculated.

  Based on the compensation algorithm, a drive signal FO1 sent to the first focus / tilt coil 31 of the actuator movable main body 70 of the differential actuator 50 is calculated. Further, based on the compensation algorithm, the drive signal FO2 sent to the second focus / tilt coil 32 of the actuator movable main body 70 of the differential actuator 50 is calculated. Further, based on the compensation algorithm, the drive signal TR sent to the tracking coil 33 of the actuator movable main body 70 of the differential actuator 50 is calculated.

  Each drive signal FO1, FO2, TR calculated using a compensation algorithm is input to a differential focus / tilt OPU 2A, for example, so that each differential actuator constituting the differential focus / tilt OPU 2A 50, for example, IO failure of the actuator movable main body 70 of the OPU 2A caused by an error in the manufacturing process is avoided. Or, during the operation of the differential actuator 50 of the OPU 2A, the occurrence of rolling of the actuator movable main body 70 including the plurality of coils 31, 32, 33 is avoided. A compensation algorithm is added to the driving program X for driving the OPU 2A, and the calculation of each drive signal FO1, FO2, TR is performed using the compensation algorithm, thereby avoiding the occurrence of each of the above problems.

An algorithm for operating the actuator 50 including the coils 31, 32, 33, etc. will be described in detail below. A so-called basic matrix of the distribution of the general distribution of drive signals FO1, FO2, TR used when driving the actuator 50 of the differential focus / tilt type OPU 2A is determined based on the following equation (B). Like the above formula (A), the following formula (B) is, for example, a matrix equation or a determinant. The following equation (B) is a matrix equation or determinant that clearly shows the above equation (A).

Based on the above formula (B), the drive signal FO1 sent to the first focus / tilt coil 31 of the actuator movable main body 70 of the differential actuator 50 is calculated. Further, based on the above formula (B), the drive signal FO2 sent to the second focus / tilt coil 32 of the actuator movable main body 70 of the differential actuator 50 is calculated. Further, based on the above formula (B), the drive signal TR sent to the tracking coil 33 of the actuator movable main body 70 of the differential actuator 50 is calculated.

  By performing the calculation based on the above formula (B), the IO failure of the actuator movable main body 70 of the OPU 2A, the occurrence of rolling of the actuator movable main body 70 in the OPU 2A, and the like are avoided. By using the compensation algorithm based on the above formula (B) in the driving program X for driving the OPU 2A in order to optimally distribute the driving force in the three directions of the focus direction Df, the tracking direction Dr, and the tilt direction Dt, The drive signals FO1, FO2, TR sent to the differential actuator 50 of the OPU 2A are calculated. Based on the above formula (B), a drive signal FO1 sent to the first focus / tilt coil 31 of the actuator movable main body 70 of the differential actuator 50, a drive signal FO2 sent to the second focus / tilt coil 32, Since the drive signal TR sent to the tracking coil 33 is calculated, the occurrence of each of the above problems is avoided.

  This optical disk apparatus 1A can be equipped with any of the OPUs 2A (FIG. 15) shown in FIGS. 3 to 9, etc. in which the storage unit 90 is omitted from the OPU 2C (FIG. 19), for example. For this reason, the optical disk apparatus 1A is an optical disk apparatus 1A that can keep the price low.

  The optical disc apparatus 1A includes at least one of the above formula (A), the above formula (B), the above formula (1), the above formula (2), the above formula (3), and the above formula (I). A control unit 100 that accurately and quickly performs an operation based on an expression is provided. For example, the system control unit 100 of the optical disc apparatus 1A may use the above formula (A), the above formula (B), the above formula (1), the above formula (2), the above formula (3), or the above formula (I). It is assumed that the DSP 100 is configured to be able to accurately and quickly execute operations based on the above. Further, for example, the system control unit 100 of the optical disc apparatus 1 </ b> A may have the above formula (A) or the above formula (B), the above formula (1), the above formula (2), the above formula (3), or the above formula (I). Among them, the DSP 100 is configured to be able to execute an operation based on a plurality of arbitrary expressions accurately and quickly. More specifically, the system control unit 100 of the optical disc apparatus 1A includes the above formula (A), the above formula (B), the above formula (1), the above formula (2), the above formula (3), and the above formula (3). It is assumed that the DSP 100 is configured to be able to quickly and simultaneously execute operations based on all the equations of I).

  Further, the optical disc apparatus 1A has the coefficients A11, A12, A13 input to the above formula (A), formula (B), formula (1), formula (2), formula (3), or formula (I). , A14, A21, A22, A23, A24, A31, A32, A33, A34, and C are provided in the DSP 100.

  An optical disc apparatus 1A is provided that includes a storage circuit unit 111 and / or 112 that can store the coefficients A11, A12, A13, A14, A21, A22, A23, A24, A31, A32, A33, A34, C in the DSP 100. Thus, for example, the occurrence of IO failure of the OPU 2A due to, for example, an error in the manufacturing process of the OPU 2A is avoided. Alternatively, an optical disc apparatus 1A provided with a storage circuit unit 111 and / or 112 capable of storing the coefficients A11, A12, A13, A14, A21, A22, A23, A24, A31, A32, A33, A34, C in the DSP 100. By being configured, for example, occurrence of rolling of the OBLs 11 and 12 during the operation of the OPU 2A is avoided.

Coefficients A11, A12, A13, A14, A21, A22, A23, A24, A31 stored in the storage circuit unit 111 and / or 112 in the DSP 100 of the optical disc apparatus 1A
, A32, A33, A34, and C, the required coefficients A11, A12, A13, A14, A21, A22, A23, A24, A31, A32, A33, A34, and C are used, and the optical disc apparatus 1A is used. The CPU 110 in the DSP 100 performs arithmetic processing of the above formula (A), the above formula (B), the above formula (1), the above formula (2), the above formula (3), or the above formula (I). For example, in each of the differential actuators 50 constituting the differential focus / tilt type OPU 2A, occurrence of, for example, IO failure in the actuator movable main body 70 of the OPU 2A due to an error in the manufacturing process is avoided. Or, during the operation of the differential actuator 50 of the OPU 2A, the occurrence of rolling of the actuator movable main body 70 having the OBLs 11 and 12 is avoided.

  As an operation based on at least one of the above formula (A), the above formula (B), the above formula (1), the above formula (2), the above formula (3), or the above formula (I), for example, The calculation based on the above formula (A), the above formula (B), the above formula (1), the above formula (2), the above formula (3), or the above formula (I), or the above formula (1). Among the above formula (2), the above formula (3), or the above formula (I), an operation based on any of a plurality of formulas, the above formula (A), the above formula (B), the above formula (1), Calculations based on all the formulas (2), (3), and (I) are performed accurately and quickly by the DSP 100 of the optical disc apparatus 1A. As a result, the IO characteristics of the actuator movable main body 70 of the OPU 2A and the rolling suppression characteristics of the actuator movable main body 70 having the OBLs 2 and 12 of the OPU 2A are compensated, and the optical disk apparatus 1A and the price can be kept low. The control method can be provided.

  Further, the control method of the OPU 2A / optical disc apparatus 1A is via the LD 3 capable of emitting the laser light 300, the half mirror capable of changing the traveling direction of the laser light 300, the polarizing member 6 such as PBS, and the polarizing member 6. The movable / operable OBLs 11 and 12 for condensing the laser beam 300 on the optical disc 200, and a plurality of divided sensors that are irradiated and reflected by the polarizing member 6 while the optical disc 200 is irradiated and reflected. The OPU 2A / optical disc apparatus 1A is controlled using the OPU 2A including the photodetectors 80 having the units 82, 83, 84/87, 88, and 89.

  Calculation is performed based on the spots 312, 313, 314/317, 318, and 319 of the laser beam 300 irradiated to the plurality of sensor units 82, 83, 84/87, 88, and 89 that constitute the photodetector 80. Thus, the positions of the operating OBLs 11 and 12 are calculated.

  More specifically, based on the spots 312, 313, 314/317, 318, 319 of the laser light 300 irradiated to the plurality of sensor units 82, 83, 84/87, 88, 89 constituting the photodetector 80, for example, The optical disc apparatus 1A performs calculations / calculations based on the above formula (A), the above formula (B), the above formulas (1) to (24), and the above formula (I), so that the movable OBLs 11 and 12 are movable. Is calculated.

  This makes it possible to provide a control method for the OPU 2A / optical disc apparatus 1A that can accurately calculate the positions of the operating OBLs 11 and 12. Based on the spots 312, 313, 314/317, 318, and 319 of the laser light 300 irradiated to the plurality of sensor units 82, 83, 84/87, 88, and 89 constituting the photodetector 80, for example, the above formula ( A), the positions of the movable OBLs 11 and 12 by allowing the optical disc apparatus 1A to execute calculations / calculations based on the above formula (B), the above formulas (1) to (24), and the above formula (I). Can be provided with a method for controlling the OPU 2A / optical disc apparatus 1A.

Signal layer 210 of optical disc 200 When condensing the laser beam 300 on a so-called pit surface portion, the signal layer 210 of the optical disc 200 is placed on the signal layer 210 of the optical disc 200 in order to cause the focused spot 301 of the laser beam 300 to follow the signal layer 210 of the optical disc 200 accurately. The OBLs 11 and 12 are controlled by operating a focus servo for accurately focusing the laser beam 300 and a tracking servo for accurately tracing the track 212 of the signal layer 210 of the optical disc 200.

  As described above, the focus servo and the tracking servo are operated to control the OBLs 11 and 12, so that the laser beam 300 is accurately focused on the signal layer 210 of the optical disc 200. The focus servo for focusing the laser beam 300 on the signal layer 210 of the optical disc 200 and the tracking servo for tracing the track 212 of the signal layer 210 of the optical disc 200 are operated, thereby condensing the laser beam 300 on the optical disc 200. The operating OBLs 11 and 12 are controlled with high accuracy, and the positions of the OBLs 11 and 12 are calculated with high accuracy.

  Further, tilt control for tilting the OBLs 11 and 12 according to the warp of the optical disc 200 is controlled by differential driving of the focus. For example, when the actuator movable main body 70 of the differential actuator 50 constituting the OPU 2A is operated while performing tilt control, the voltage applied to the first focus / tilt coil 31 of the actuator movable main body 70 and the actuator movable main body By generating a constant potential difference between the second focus / tilt coil 32 and the voltage applied to the second focus / tilt coil 32, the actuator movable main body 70 of the differential actuator 50 by an amount corresponding to the tilt angle so-called tilt angle corresponding to the potential difference. Can be inclined.

  Alternatively, for example, when the differential actuator 50 of the OPU 2A is operated while performing tilt control according to the design / specifications of the OPU 2A, the second focus / tilt coil 32 with respect to the direction of the current flowing through the first focus / tilt coil 31. It is also possible to reverse the direction of the current flowing through the actuator and to cause the focus / tilt coils 31 and 32 to generate a force according to the amount of current of the focus / tilt coils 31 and 32 to tilt the actuator movable main body 70 of the OPU 2A. For example, it is possible.

  When calculating the positions of the operating OBLs 11 and 12, tilt control for tilting the OBLs 11 and 12 corresponding to the warp of the optical disc 200 is adjusted / changed as necessary.

  When the tilt control is adjusted / changed as necessary, the OBL 2 or the OBL 11 or 12 of the OPU 2A is used to focus the laser beam 300 on the warped optical disc 200, so that the optical disc 200 is warped. When the tilt control for tilting the lens holder 20 equipped with the plurality of OBLs 11 and 12 is executed, the lens holder 20 including the plurality of tilted OBLs 11 and 12 is inadvertently moved in the tracking direction Dr of the optical disc 200. The occurrence of a problem of so-called lens shift that moves substantially along is avoided.

  When the lens holder 20 equipped with the plurality of OBLs 11 and 12 is tilted corresponding to the warp of the optical disc 200, the lens holder 20 having the plurality of OBLs 11 and 12 is substantially along the radial direction Dr of the optical disc 200, the so-called tracking direction Dr. And being shifted by the tilt control using a special calculation based on the above formula (I) or the like (FIGS. 12 and 13).

When the lens holder 20 having the plurality of OBLs 11 and 12 is moved and shifted substantially along the tracking direction Dr of the optical disc 200, the inclination of the lens holder 20 having the plurality of OBLs 11 and 12 is expressed by the above formula (I ) Etc., the lens shift that the lens holder 20 having a plurality of tilted OBLs 11 and 12 moves inadvertently along the tracking direction Dr of the optical disc 200 by adjusting by tilt control using a special calculation based on Generation of movement is avoided. When the tilt control for tilting the lens holder 20 equipped with the plurality of OBLs 11, 12 corresponding to the warp of the optical disk 200 is executed, the lens holder 20 having the plurality of tilted OBLs 11, 12 is attached to the optical disk 200. The lens shift operation that inadvertently moves substantially along the tracking direction Dr is canceled, and tilt control for tilting the lens holder 20 equipped with the plurality of OBLs 11 and 12 operates normally.

  When the lens holder 20 equipped with the plurality of OBLs 11 and 12 is tilted corresponding to the warp of the optical disc 200, a predetermined value is applied to the tracking coil 33 according to the tilt angle of the lens holder 20 equipped with the plurality of OBLs 11 and 12. A reverse voltage for correction is applied (FIGS. 12 and 13).

  Accordingly, when the tilt control for tilting the lens holder 20 equipped with the plurality of OBLs 11 and 12 corresponding to the warp of the optical disc 200 is executed, the lens holder 20 having the plurality of tilted OBLs 11 and 12 is obtained. Occurrence of a problem of inadvertently moving substantially along the tracking direction Dr of the optical disc 200 is avoided. When the lens holder 20 equipped with the plurality of OBLs 11 and 12 is tilted corresponding to the warp of the optical disc 200, a predetermined value is applied to the tracking coil 33 according to the tilt angle of the lens holder 20 equipped with the plurality of OBLs 11 and 12. By applying the reverse voltage for correction, the lens shift operation in which the lens holder 20 having the OBLs 11 and 12 moves carelessly substantially along the tracking direction Dr of the optical disc 200 is canceled, and a plurality of OBLs 11 and 12 are provided. The tilt control for tilting the lens holder 20 operates normally.

  The optical disk apparatus 1A (FIG. 15) can execute the control method of the OPU 2A / optical disk apparatus 1A. It is possible to configure the optical disk apparatus 1A that can execute the control method of the OPU 2A / optical disk apparatus 1A that can accurately calculate the positions of the operating OBLs 11 and 12. It is possible to configure the optical disc apparatus 1A that can execute the control method of the OPU 2A / optical disc apparatus 1A that can accurately calculate the positions of the movable OBLs 11 and 12.

  Further, by executing the control method of the OPU 2A / optical disc apparatus 1A, the lens holder 20 having a plurality of OBLs 11 and 12 of the OPU 2A is tilt-controlled, for example, even if no additional special circuit is provided. When tilted, the lens shift operation in which the lens holder 20 having the plurality of OBLs 11 and 12 inadvertently moves substantially along the tracking direction Dr of the optical disc 200 is canceled. Further, since no additional special circuit is required, the lens holder 20 having the plurality of OPUs 11 and 12 of the OPU 2A during tilt control is inadvertently arranged along the tracking direction Dr of the optical disc 200 without increasing the cost. It is easy to avoid the occurrence of the lens shift operation of moving to. In order to improve the lens shift operation occurring in the lens holder 20 having the plurality of OBLs 11 and 12 when the tilt control is performed on the operation of the lens holder 20 having the plurality of OBLs 11 and 12 of the OPU 2A, For example, by adopting measures that can be taken as a system, the degree of freedom in design of the differential actuator 50 and the like constituting the OPU 2A is improved, and it is possible to reduce costs.

From the tracking error signal TE and the like of the actuator 50 (FIGS. 3 to 9) of the OPU 2A (FIGS. 1 to 3 to 9), the rolling frequency component (eg, FIGS. 10 and 11) of the actuator 50, the lens shift / tilt angle component (Example: FIG. 13), the pickup device information is extracted, then the level to be added / adjusted / changed is calculated in advance, and then the rolling generation level and lens shift generation level generated in the actuator 50 need to be improved. The correction level is checked, and the result of checking the required correction level, such as the rolling generation level and the lens shift generation level, is stored in the information unit 98, for example, the information recording unit 98a of the information reading member 98, as OPU2A information. Next, for example, the information reading member 98 is attached to the back surface portion 91a of the housing 91 of the OPU 2A (FIG. 14). Next, when the optical disk apparatus 1A is assembled by mounting the OPU 2A or the like on the optical disk apparatus 1A (FIG. 15), the information of the OPU 2A stored in the information recording unit 98a of the information reading member 98 (FIG. 14) is stored in the optical disk apparatus 1A ( 15) in the storage circuit unit 111 such as EEPROM, EEPROM, EPROM, etc. and / or the storage circuit unit 112 such as RAM, and then the OPU 2A is mounted on the optical disk apparatus 1A and the optical disk apparatus 1A is assembled. Alternatively, after assembling the optical disk apparatus 1A, the optical disk apparatus 1A is turned on, and the DSP 100 in the optical disk apparatus 1A reads the investigation results of the required correction level such as the rolling generation level and the lens shift generation level. An operation check test of the optical disc apparatus 1A is performed.

  By performing the setting method of the optical disc apparatus 1A in this way, the actuator 50 of the OPU 2A in the optical disc apparatus 1A is appropriately controlled. In accordance with the characteristics of the OPU 2A actuator 50 alone, an appropriate correction amount is added to the tracking error signal TE and the like of the actuator 50 constituting the OPU 2A by the DSP 100 in the optical disk apparatus 1A, and the DSP 100 in the optical disk apparatus 1A The actuator 50 of the OPU 2A in the optical disc apparatus 1A is appropriately controlled.

  Further, when assembling the optical disk apparatus 1A by mounting the OPU 2A or the like on the optical disk apparatus 1A, for example, the information on the OPU 2A stored in the information recording section 98a of the information reading member 98 attached to the back surface section 91a of the housing 91 of the OPU 2A is stored in the EEROM. Rolling generation level and lens shift generation stored in the storage circuit unit 111 such as EEPROM, EPROM and / or the storage circuit unit 112 such as RAM and used as information of the OPU2A stored in the storage circuit unit 111 and / or 112 By causing the DSP 100 in the optical disc apparatus 1A to read the investigation result of the required correction level such as the level, for example, a rolling generation level, a lens shift generation level, etc. are required without requiring an additional special circuit. Survey results of improvement correction level is optical disc And thus incorporated into DSP100 the location 1A. Since no additional special circuit is required, the margin for so-called eg tolerance / difference / range of rolling of the actuator 50, lens shift, etc. is improved without increasing costs. In order to improve the margin for rolling, lens shift, etc., the measures that can be taken as a system, for example, are adopted in this way, so that the design freedom of the actuator 50 is improved and the cost can be reduced. . The required correction level for improving the margin for rolling and lens shift is, for example, a rolling generation level and / or a lens shift generation level.

An example of the information recording part (98a) of the information reading member (98) is a one-dimensional code. More specifically, examples of the information recording unit (98a) of the one-dimensional code type information reading member (98) include a barcode information recording unit (98a) of barcode paper. The bar code means an identifier representing a numerical value or a character based on the thickness of a striped line, for example. An example of the information recording unit 98a of the information reading member 98 is a two-dimensional code. Specifically, the information recording unit 98a of the information reading member 98 of the two-dimensional code system includes, for example, a QR code information recording unit 98a of QR code (registered trademark) paper. The QR code (Quick Response code) means, for example, a matrix type code in which small square points are arranged in the same number in the vertical and horizontal directions. Moreover, as the information recording part (98a) of the information reading member (98), for example, a three-dimensional code including a plurality of two-dimensional codes can be cited. Examples of the information recording part (98a) of the information reading member (98) of the three-dimensional code system include a three-dimensional solid code information recording part (98a) of a three-dimensional solid code sheet. As described above, in the optical disk apparatus 1A including the OPU 2A and / or the OPU 2A, the information recording unit 98a of the information reading member 98 includes the information recording unit (98a) of the information reading member (98) of the one-dimensional code system, the two-dimensional An information recording section 98a of an information reading member 98 of a multi-dimensional code system such as a code system or a three-dimensional code system can be used. The information recording unit 98a of the information reading member 98 of a multi-dimensional code system such as a two-dimensional code system or a three-dimensional code system has more data than the information recording part (98a) of the information reading member (98) of the one-dimensional code system. Since the information and the like can be stored, a multidimensional code information reading member 98 is preferably used.

  In the inspection process when the optical disc apparatus 1A is completed, an excitation signal is added to the tracking signal of the actuator 50, and the injection signal level from the tracking error signal TE to the differential focus error signal is an index when the tracking error signal TE is maximum. To make a decision.

  By performing the setting method of the optical disc apparatus 1A in this way, posture change due to rolling of the OBLs 11 and 12 of the lens holder 20 constituting the actuator 50 is improved. The rolling frequency components of the OBLs 11 and 12 of the lens holder 20 constituting the actuator 50 of the OPU 2A are extracted from the tracking drive signal, and a signal based on the rolling frequency component is added to the differential focus drive signal so as to suppress rolling. Thus, the posture change due to rolling of the OBLs 11 and 12 of the lens holder 20 constituting the actuator 50 is improved.

  When performing the setting method of the optical disc apparatus 1A, the basic optical disc (200) in which the tilt amount of the optical disc (200) is minimized by using a glass optical disc (200) or the like is used. First, laser light 300 is emitted from the OPU 2A toward the basic optical disk (200), and then when the focus of the OPU 2A with respect to the basic optical disk (200) is turned on, the lens holder 20 constituting the actuator 50 The OBLs 11 and 12 are vibrated in the tracking direction Dr, and the amount of change in the reflection level light 300 from the basic optical disc (200) at that time and the rolling levels of the OBLs 11 and 12 of the lens holder 20 constituting the actuator 50 are measured. After that, the optimum value of the correction level is obtained based on the measurement result.

  The optical disc apparatus 1A includes, for example, any one of the OPU 2A shown in FIGS. 1, 3 to 9, 14 and the like, the CPU 110 (FIG. 15), the ROM 111, and the RAM 112, and the formula (B). The DSP 100 that performs the calculation based on the above accurately and quickly and the driver 150 are provided.

  The control method of the optical disk apparatus 1A for executing the attitude control of the actuator movable main body 70 of the differential actuator 50 (FIGS. 3 to 9) constituting the OPU 2A using the optical disk apparatus 1A configured as described above is as described above. This is performed based on the formula (B).

  For example, the focus error signal FE, the tracking error signal TE, and the corrected tilt amount signal TILT are input to the software X (FIG. 17), and the calculation based on the above formula (B) is performed by the software X, whereby each drive signal FO1. , FO2, TR are output.

  By configuring the optical disc apparatus 1A including the DSP 100 that performs the calculation based on the formula (B) accurately and quickly, and executing the control method of the optical disc apparatus 1A that performs the calculation process of the formula (B) by the software X, For example, in the individual differential actuators 50 constituting the differential focus / tilt type OPU 2A, occurrence of, for example, an IO failure in the actuator movable main body 70 of the OPU 2A due to an error in the manufacturing process is avoided.

Or, during the operation of the differential actuator 50 of the OPU 2A, the actuator movable having the coils 31, 32, 33 such as the OBL 11, 12, the first focus / tilt coil 31, the second focus / tilt coil 32, the tracking coil 33, etc. Occurrence of rolling of the main body 70 is avoided. A compensation algorithm based on the above equation (B) is added to the driving program X for driving the OPU 2A, and the calculation of each drive signal FO1, FO2, TR is performed using the compensation algorithm, thereby causing the occurrence of each problem. It is possible to provide the optical disc apparatus 1A and the control method thereof.

  The calculation based on the above formula (B) is performed accurately and quickly by the DSP 100 of the optical disc apparatus 1A. Accordingly, it is possible to provide the optical disc apparatus 1A in which the IO characteristics of the actuator movable main body 70 of the OPU 2A and the rolling suppression characteristics of the actuator movable main body 70 of the OPU 2A are compensated, and the control method thereof.

  Thus, the optical disc apparatus 1A can execute the setting method of the optical disc apparatus 1A.

  As a result, the degree of freedom in designing the actuator 50 is improved, and it is possible to provide the optical disc apparatus 1A that can cope with cost reduction.

  The OPU 2A and the optical disk apparatus 1A including the OPU 2A are a recording / reproducing apparatus that records data / information / signals / images and the like on the various optical disks 200 and reproduces data / information / signals and the like on the various optical disks 200. It is possible to use it. More specifically, the OPU 2A and the optical disc apparatus 1A including the OPU 2A cause the various optical discs 200 to record data / information / signals / images, etc., and reproduce the data / information / signals, etc., of the various optical discs 200. Or can be used for a recording / reproducing / erasable device that erases data / information / signals and the like of the various optical disks 200. Further, the OPU 2A and the optical disc apparatus 1A including the OPU 2A can be used as a reproduction-only apparatus that reproduces data / information / signals and the like of the various optical discs 200.

  In addition, the OPU 2A is installed in an optical disc apparatus 1A that is assembled in, for example, a computer, an audio / video device, a game machine, an in-vehicle device (all not shown), or the like. The optical disc apparatus 1A including the OPU 2A includes, for example, a notebook personal computer (PC), a laptop PC, a desktop PC, a computer such as an in-vehicle computer, and a game such as a computer game machine. And audio and / or video equipment such as a CD player / CD recorder and a DVD player / DVD recorder (both not shown). The optical disk apparatus 1A including the OPU 2A includes, for example, a plurality of “CD” optical disks, “DVD” optical disks, “HD DVD” optical disks, “CBHD” optical disks, “Blu-ray Disc” optical disks, and the like. The media 200 can be used. An optical disc apparatus 1A provided with an OPU 2A includes a computer, sound and / or video equipment, game machine compatible with various optical discs 200 such as “CD”, “DVD”, “HD-DVD”, “CBHD”, “Blu-ray Disc”, etc. It can be installed in in-vehicle devices and the like (both not shown).

  As mentioned above, although embodiment of this invention was described, embodiment of the invention mentioned above is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

For example, instead of the OPU 2A equipped with the two OBLs 11 and 12, an OPU (not shown) equipped with one OBL may be used. For example, instead of the two-piece lens holder 20, a one-piece lens holder (not shown) may be used. Also,
In place of the LD 3 capable of emitting laser light 300 of two types of wavelengths, an infrared laser beam 300 of “CD” standard having a wavelength of approximately 780 nm and a red laser beam 300 of “DVD” standard having a wavelength of approximately 650 nm, “CD” standard infrared laser light 300 with a wavelength of approximately 780 nm, “DVD” standard red laser light 300 with a wavelength of approximately 650 nm, and “HD DVD” standard, “CBHD” standard, or “Blu- A three-wavelength compatible LD (3) that can emit blue-violet laser light 300 such as the “ray Disc” standard may be used. Further, for example, an LD (not shown) capable of emitting a single wavelength laser beam 300 may be used instead of the LD 3 capable of emitting a plurality of types of laser beams 300. Further, for example, instead of the light receiving portion having a substantially rectangular shape in plan view, which is divided into four substantially equally divided into four segments in plan view, two segments having substantially rectangular shapes in plan view are provided. A light receiving portion (not shown) having a substantially rectangular shape in plan view may be configured in the photodetector. For example, instead of the four-divided diffraction grating 4, a two-divided diffraction grating (not shown) or a three-divided diffraction grating (not shown) may be used. Further, for example, the control method of the OPU 2A / optical disk apparatus 1A may be executed on the tracking coil 33 wired to the tilt unit. Further, for example, the DSP 100 of the optical disc apparatus 1A may be omitted without being equipped with the second storage circuit unit 112 such as the RAM 112.

  FIG. 18 is a diagram illustrating a pickup apparatus according to a second embodiment in which the control method of the pickup apparatus according to the present invention is executed.

  More specifically, FIG. 18 is a schematic plan view showing the OPU 2B in which the control method of the OPU 2B / optical disc apparatus 1B is executed.

  In the OPU 2A of the first embodiment shown in FIG. 14, an information reading member 98 is affixed to the housing 91 of the OPU 2A. In the OPU 2B of the second embodiment shown in FIG. 18, the information reading member is placed on the FPC 93 of the OPU 2B. 99 is pasted. The OPU 2B is substantially the same as the description of the OPU 2A shown in FIGS. 1 to 14 except that the information reading member 99 is mounted on the FPC 93 instead of the housing 91. In the OPU 2B of the second embodiment shown in FIG. 18, the same reference numerals are assigned to the same contents as those of the OPU 2A of the first embodiment shown in FIGS. 1 to 14, and the detailed description thereof is omitted. 18 is substantially the same as the description of the optical disk apparatus 1A provided with the OPU 2A according to the first embodiment shown in FIGS. 15 to 17 in the optical disk apparatus 1B (FIG. 15) provided with the OPU 2B according to the second embodiment shown in FIG. About the thing, the same code | symbol was attached | subjected and the detailed description was abbreviate | omitted.

From the tracking error signal TE and the like of the actuator 50 (FIGS. 3 to 9) of the OPU 2B (FIGS. 1 to 3 to 9), the rolling frequency component (eg, FIGS. 10 and 11) of the actuator 50, the lens shift / tilt angle component (Example: FIG. 13), the pickup device information is extracted, then the level to be added / adjusted / changed is calculated in advance, and then the rolling generation level and lens shift generation level generated in the actuator 50 need to be improved. The correction level is investigated, and then the investigation result of the required correction level, such as the rolling occurrence level and the lens shift occurrence level, is stored in the information unit 99, for example, the information recording unit 99a of the information reading member 99, as OPU2B information. Next, for example, the information reading member 99 is attached to one surface portion 93a of the FPC 93 of the OPU 2B (FIG. 18). When the optical disk apparatus 1B is assembled by mounting the OPU 2B or the like on the optical disk apparatus 1B (FIG. 15), the information of the OPU 2B stored in the information recording unit 99a of the information reading member 99 (FIG. 18) is stored in the optical disk apparatus 1B (FIG. 15). ) In the storage circuit unit 111 such as EEPROM, EEPROM, EPROM and / or the storage circuit unit 112 such as RAM, and then the OPU 2B is mounted on the optical disk apparatus 1B and the optical disk apparatus 1B is assembled or the optical disk After assembling the apparatus 1B, the optical disk apparatus 1B is turned on, and the DSP 100 in the optical disk apparatus 1B is caused to read the investigation result of the required correction level such as the rolling generation level and the lens shift generation level. Perform 1B operation check test.

  By performing the setting method of the optical disc apparatus 1B as described above, the actuator 50 of the OPU 2B in the optical disc apparatus 1B is appropriately controlled. In accordance with the characteristics of the OPU 2B actuator 50 alone, an appropriate correction amount is added to the tracking error signal TE or the like of the actuator 50 constituting the OPU 2B by the DSP 100 in the optical disk apparatus 1B, and the DSP 100 in the optical disk apparatus 1B The actuator 50 of the OPU 2B in the optical disc apparatus 1B is appropriately controlled.

  Further, when assembling the optical disk apparatus 1B by mounting the OPU 2B or the like on the optical disk apparatus 1B, for example, the information on the OPU 2B stored in the information recording unit 99a of the information reading member 99 attached to the one surface part 93a of the FPC 93 of the OPU 2B is stored in the EEROM, Rolling generation level and lens shift generation level stored in storage circuit unit 111 such as EEPROM and EPROM and / or storage circuit unit 112 such as RAM and used as OPU2B information stored in storage circuit unit 111 and / or 112 For example, the DSP 100 in the optical disc apparatus 1B reads the correction result of the required improvement correction level such as a rolling generation level, a lens shift generation level, and the like without requiring an additional special circuit. The result of the correction level survey is the optical disk device And thus incorporated into DSP100 of B. Since no additional special circuit is required, the margin for so-called eg tolerance / difference / range of rolling of the actuator 50, lens shift, etc. is improved without increasing costs. In order to improve the margin for rolling, lens shift, etc., the measures that can be taken as a system, for example, are adopted in this way, so that the design freedom of the actuator 50 is improved and the cost can be reduced. .

  FIG. 19 is a diagram showing a disk device and its setting method according to the third embodiment of the present invention.

  FIG. 19 is drawn for the sake of convenience in order to easily explain the third embodiment of the disk device. Specifically, FIG. 19 is a block diagram showing the disk device 1C.

  In the optical disc apparatus 1A of the first embodiment shown in FIG. 15, the OPU 2A constituting the optical disc apparatus 1A is omitted without being equipped with a storage unit such as EEROM, but the optical disc of the third embodiment shown in FIG. In the apparatus 1C, the OPU 2C constituting the optical disk apparatus 1C is equipped with a storage unit 90 such as an EEROM 90, and the EEROM 90 of the OPU 2C and the CPU 110 of the DSP 100 of the optical disk apparatus 1C are connected to be energized. In the OPU 2A (FIG. 15) of the first embodiment, a storage unit such as EEROM is omitted without being equipped, whereas in the OPU 2C (FIG. 19) of the third embodiment, an OPU 2C including the EEROM 90 is provided. It is configured. The OPU 2C is substantially the same as the description of the OPU 2A shown in FIGS. 1 to 14 except that a storage unit such as an EEROM is provided. In the optical disc apparatus 1C provided with the OPU 2C of the third embodiment shown in FIG. 19, the description is substantially the same as the description of the optical disc apparatus 1A provided with the OPU 2A of the first embodiment shown in FIGS. Reference numerals are assigned and detailed description thereof is omitted.

The OPU 2C includes a storage unit 90 that stores a program that causes the arithmetic unit 110 of the control unit 100 of the optical disc apparatus 1C to perform various controls, coefficients necessary for the OPU 2C, optimal compensation parameters, and the like. Each function implemented by software or the like is stored in the storage unit 90 accessible by the arithmetic unit 110 of the control unit 100 of the optical disc apparatus 1C. The arithmetic unit 110 of the control unit 100 of the optical disc apparatus 1C is configured to perform various controls / operations based on a program stored in a storage unit 90 such as a flash ROM. For example, a flash memory is used as the storage unit 90. The storage unit 90 is configured as a storage circuit unit, for example. The storage unit 90 will be described in detail. Examples of the storage unit 90 include a ROM such as an EEROM. The storage unit 90 will be specifically described. Examples of the storage unit 90 include a ROM such as an EEPROM. The storage unit 90 includes a ROM such as an EPROM.

  The OPU 2C (FIG. 1) includes the actuator movable main body 70, the actuator fixing main body, the LD 3, the diffraction grating 4, the polarizing member 6, the CL 7, the QWP 8, and the reflection mirror. 9, the first parallel plate 10I, the second parallel plate 10II, the first OBL 11, the second OBL 12, the photodetector 80 (FIGS. 1 and 19), and the above EEROM 90, and is configured as a differential focus / tilt type OPU 2C that can read and / or write signals to and from the optical disc 200. The OPU 2A (FIG. 1) further includes the coupling lens 5I and the FMD 5II as necessary.

  Further, the control method of the OPU2C / optical disc apparatus 1C is via an LD 3 capable of emitting the laser light 300, a half mirror capable of changing the traveling direction of the laser light 300, a polarizing member 6 such as PBS, and the polarizing member 6. The movable / operable OBLs 11 and 12 for condensing the laser beam 300 on the optical disc 200, and a plurality of divided sensors that are irradiated and reflected by the polarizing member 6 while the optical disc 200 is irradiated and reflected. The OPU 2C / optical disc apparatus 1C is controlled using the OPU 2C including the photodetectors 80 having the units 82, 83, 84/87, 88, and 89. Calculation is performed based on the spots 312, 313, 314/317, 318, and 319 of the laser beam 300 irradiated to the plurality of sensor units 82, 83, 84/87, 88, and 89 that constitute the photodetector 80. Thus, the positions of the operating OBLs 11 and 12 are calculated. More specifically, based on the spots 312, 313, 314/317, 318, 319 of the laser light 300 irradiated to the plurality of sensor units 82, 83, 84/87, 88, 89 constituting the photodetector 80, for example, When the optical disk apparatus 1C performs calculations / calculations based on the above formula (A), the above formula (B), the above formulas (1) to (24), and the above formula (I), the movable OBLs 11 and 12 are movable. Is calculated.

  This makes it possible to provide a control method for the OPU 2C / optical disc apparatus 1C that can accurately calculate the positions of the operating OBLs 11 and 12. Based on the spots 312, 313, 314/317, 318, and 319 of the laser light 300 irradiated to the plurality of sensor units 82, 83, 84/87, 88, and 89 constituting the photodetector 80, for example, the above formula ( A), the positions of the movable OBLs 11 and 12 by allowing the optical disc apparatus 1C to execute calculations / calculations based on the above formula (B), the above formulas (1) to (24), and the above formula (I). Can be provided with a method of controlling the OPU2C / optical disc apparatus 1C.

  Signal layer 210 of optical disc 200 When condensing the laser beam 300 on a so-called pit surface portion, the signal layer 210 of the optical disc 200 is placed on the signal layer 210 of the optical disc 200 so that the focused spot 301 of the laser beam 300 follows the signal layer 210 of the optical disc 200 accurately The OBLs 11 and 12 are controlled by operating a focus servo for accurately focusing the laser beam 300 and a tracking servo for accurately tracing the track 212 of the signal layer 210 of the optical disc 200.

As described above, the focus servo and the tracking servo are operated to control the OBLs 11 and 12, so that the laser beam 300 is accurately focused on the signal layer 210 of the optical disc 200. The focus servo for focusing the laser beam 300 on the signal layer 210 of the optical disc 200 and the tracking servo for tracing the track 212 of the signal layer 210 of the optical disc 200 are operated, thereby condensing the laser beam 300 on the optical disc 200. The operating OBLs 11 and 12 are controlled with high accuracy, and the positions of the OBLs 11 and 12 are calculated with high accuracy.

  Further, tilt control for tilting the OBLs 11 and 12 according to the warp of the optical disc 200 is controlled by differential driving of the focus. For example, when the actuator movable main body 70 of the differential actuator 50 constituting the OPU 2C is operated while performing tilt control, the voltage applied to the first focus / tilt coil 31 of the actuator movable main body 70 and the actuator movable main body By generating a constant potential difference between the second focus / tilt coil 32 and the voltage applied to the second focus / tilt coil 32, the actuator movable main body 70 of the differential actuator 50 by an amount corresponding to the tilt angle so-called tilt angle corresponding to the potential difference. Can be inclined.

  Alternatively, for example, when the differential actuator 50 of the OPU 2C is operated while performing tilt control according to the design / specifications of the OPU 2C, the second focus / tilt coil 32 with respect to the direction of current flowing through the first focus / tilt coil 31. The direction of the current flowing through the actuator is reversed, and a force is generated in each focus / tilt coil 31, 32 according to the amount of current in each focus / tilt coil 31, 32 to tilt the actuator movable main body 70 of the OPU 2C. For example, it is possible.

  When calculating the positions of the operating OBLs 11 and 12, tilt control for tilting the OBLs 11 and 12 corresponding to the warp of the optical disc 200 is adjusted / changed as necessary.

  By adjusting / changing the tilt control as necessary, when the laser beam 300 is focused on the warped optical disc 200 using the OBL 2 or 12 of the OPU 2C, the warp of the optical disc 200 is dealt with. When the tilt control for tilting the lens holder 20 equipped with the plurality of OBLs 11 and 12 is executed, the lens holder 20 including the plurality of tilted OBLs 11 and 12 is inadvertently moved in the tracking direction Dr of the optical disc 200. The occurrence of a problem of so-called lens shift that moves substantially along is avoided.

  For example, as shown in FIG. 13, the tilt angle (deg) of the lens holder 20 including the plurality of OBLs 11 and 12 and the lens holder 20 including the plurality of OBLs 11 and 12 move inadvertently along the tracking direction Dr of the optical disc 200. The relationship with the holder movement amount (mm) is expressed by a linear function. For example, when the tilt angle is defined as A and the holder movement amount is defined as M, the holder movement amount M is determined based on the above formula (I).

  As in the above formula (I), the tilt angle A (deg) of the lens holder 20 including the plurality of OBLs 11 and 12 and the lens holder 20 including the plurality of OBLs 11 and 12 are inadvertently along the tracking direction Dr of the optical disc 200. The holder movement amount M (mm) that is moved to is directly proportional, for example, linear. Each piece of related information such as the above formula (I) is, for example, OPU 2C information, so-called pickup device information, and specifically, a lens shift occurrence level of the actuator movable main body 70 constituting the differential actuator 50 of the OPU 2C.

  When the lens holder 20 equipped with the plurality of OBLs 11 and 12 is tilted corresponding to the warp of the optical disc 200, the lens holder 20 having the plurality of OBLs 11 and 12 is substantially along the radial direction Dr of the optical disc 200, the so-called tracking direction Dr. And being shifted by the tilt control using a special calculation based on the above formula (I) or the like (FIGS. 12 and 13).

  When the lens holder 20 having the plurality of OBLs 11 and 12 is moved and shifted substantially along the tracking direction Dr of the optical disc 200, the inclination of the lens holder 20 having the plurality of OBLs 11 and 12 is expressed by the above formula (I ) Etc., the lens shift that the lens holder 20 having a plurality of tilted OBLs 11 and 12 moves inadvertently along the tracking direction Dr of the optical disc 200 by adjusting by tilt control using a special calculation based on Generation of movement is avoided. When the tilt control for tilting the lens holder 20 equipped with the plurality of OBLs 11, 12 corresponding to the warp of the optical disk 200 is executed, the lens holder 20 having the plurality of tilted OBLs 11, 12 is attached to the optical disk 200. The lens shift operation that inadvertently moves substantially along the tracking direction Dr is canceled, and tilt control for tilting the lens holder 20 equipped with the plurality of OBLs 11 and 12 operates normally.

  When the lens holder 20 equipped with the plurality of OBLs 11 and 12 is tilted corresponding to the warp of the optical disc 200, a predetermined value is applied to the tracking coil 33 according to the tilt angle of the lens holder 20 equipped with the plurality of OBLs 11 and 12. Apply reverse voltage for correction.

  Accordingly, when the tilt control for tilting the lens holder 20 equipped with the plurality of OBLs 11 and 12 corresponding to the warp of the optical disc 200 is executed, the lens holder 20 having the plurality of tilted OBLs 11 and 12 is obtained. Occurrence of a problem of inadvertently moving substantially along the tracking direction Dr of the optical disc 200 is avoided. When the lens holder 20 equipped with the plurality of OBLs 11 and 12 is tilted corresponding to the warp of the optical disc 200, a predetermined value is applied to the tracking coil 33 according to the tilt angle of the lens holder 20 equipped with the plurality of OBLs 11 and 12. By applying the reverse voltage for correction, the lens shift operation in which the lens holder 20 having the OBLs 11 and 12 moves carelessly substantially along the tracking direction Dr of the optical disc 200 is canceled, and a plurality of OBLs 11 and 12 are provided. The tilt control for tilting the lens holder 20 operates normally.

  The optical disk apparatus 1C can be equipped with, for example, an OPU 2C provided with an EEROM 90 (FIG. 19) in any one of the OPUs 2A shown in FIG. 1, FIG. 3 to FIG. 9, FIG.

  The optical disk apparatus 1C can execute the control method of the OPU 2C / optical disk apparatus 1C. It is possible to configure the optical disk apparatus 1C that can execute the control method of the OPU 2C / optical disk apparatus 1C that can accurately calculate the positions of the operating OBLs 11 and 12. It is possible to configure the optical disk apparatus 1C that can execute the control method of the OPU 2C / optical disk apparatus 1C that can accurately calculate the positions of the movable OBLs 11 and 12.

  Pickup device information such as the rolling frequency component (eg, FIGS. 10 and 11) of the actuator 50 is extracted from the tracking error signal TE and the like of the actuator 50 (FIGS. 3 to 9) of the OPU 2C (FIGS. 1 to 3 to 9). Next, a level to be added / adjusted / changed is calculated in advance, and then a correction required level such as a rolling generation level and a lens shift generation level generated in the actuator 50 is investigated, and then the rolling generation level, The investigation result of the required correction level, which is the lens shift occurrence level or the like, is stored as OPU2C information in the storage unit 90 such as EEPROM, EEPROM, EPROM, etc., and then the OPU2C is installed in the optical disk apparatus 1C, and the optical disk apparatus 1C Or after optical disc device 1C is assembled. The disk device 1C is turned on, and the DSP 100 in the optical disk device 1C reads the investigation results of the required correction level, such as the rolling generation level and the lens shift generation level, and performs an operation check test of the optical disk device 1C. .

  By performing the setting method of the optical disc apparatus 1C as described above, the actuator 50 of the OPU 2C in the optical disc apparatus 1C is appropriately controlled. In accordance with the characteristics of the OPU 2C actuator 50 alone, an appropriate correction amount is added to the tracking error signal TE of the actuator 50 constituting the OPU 2C by the DSP 100 in the optical disc apparatus 1C, and the DSP 100 in the optical disc apparatus 1C The actuator 50 of the OPU 2C in the optical disc apparatus 1C is appropriately controlled.

  Also, the DSP 100 in the optical disc apparatus 1C reads the investigation results of the correction level to be improved, such as the rolling generation level and the lens shift generation level, which are stored in the storage unit 90 such as the EEPROM, EEPROM, EPROM, etc. As a result, the margin for the rolling of the actuator 50, the lens shift, etc., so-called tolerance / difference / range, for example, is improved. In order to improve the margin for rolling, lens shift, etc., the measures that can be taken as a system, for example, are adopted in this way, so that the design freedom of the actuator 50 is improved and the cost can be reduced. .

  In the inspection process when the optical disc apparatus 1C is completed, an excitation signal is added to the tracking signal of the actuator 50, and the injection signal level from the tracking error signal TE to the differential focus error signal is an index when the tracking error signal TE is maximum. To make a decision.

  By performing the setting method of the optical disc apparatus 1C in this manner, the posture change due to rolling of the OBLs 11 and 12 of the lens holder 20 constituting the actuator 50 is improved. The rolling frequency components of the OBLs 11 and 12 of the lens holder 20 constituting the actuator 50 of the OPU2C are extracted from the tracking drive signal, and a signal based on the rolling frequency component is added to the differential focus drive signal so as to suppress rolling. Thus, the posture change due to rolling of the OBLs 11 and 12 of the lens holder 20 constituting the actuator 50 is improved.

  When performing the setting method of the optical disc apparatus 1C, the basic optical disc (200) in which the tilt amount of the optical disc (200) is minimized by using a glass optical disc (200) or the like is used. First, laser light 300 is emitted from the OPU 2C toward the basic optical disc (200), and then when the focus of the OPU 2C with respect to the basic optical disc (200) is turned on, the lens holder 20 constituting the actuator 50 The OBLs 11 and 12 are vibrated in the tracking direction Dr, and the amount of change in the reflection level light 300 from the basic optical disc (200) at that time and the rolling levels of the OBLs 11 and 12 of the lens holder 20 constituting the actuator 50 are measured. After that, the optimum value of the correction level is obtained based on the measurement result.

  This OPU2C is the coefficient A11, A12, A13, A14, A21, A22, A23, input to the above formula (A), formula (1), formula (2), formula (3), or formula (I). A storage unit 90 (FIG. 13) capable of storing A24, A31, A32, A33, A34, and C is provided.

By configuring the OPU2C including the storage unit 90 capable of storing the coefficients A11, A12, A13, A14, A21, A22, A23, A24, A31, A32, A33, A34, C, for example, in the manufacturing process of the OPU2C For example, it is possible to provide an OPU 2C in which occurrence of, for example, an IO failure in the OPU 2C caused by an error can be avoided. Alternatively, by configuring the OPU2C including the storage unit 90 capable of storing the coefficients A11, A12, A13, A14, A21, A22, A23, A24, A31, A32, A33, A34, C, for example, the operation of the OPU2C It is possible to provide the OPU 2C that can avoid the occurrence of rolling of the OBLs 11 and 12 at the time. For example, by incorporating the OPU 2C including the storage unit 90 into the optical disc apparatus 1C, an optical disc apparatus 1C that can easily solve the above problems is configured.

  For example, when manufacturing variation occurs for each OPU 2C due to differences in the manufacturing site / environment of the OPU 2C, the optimum compensation parameter required for each OPU 2C may vary accordingly. Even if such a situation occurs, the optimum compensation parameter required for each OPU 2C is stored in advance as, for example, OPU 2C component information in the storage unit 90 such as the EEROM 90 of the OPU 2C, and the EEROM 90 in the optical disc apparatus 1C such as a drive device is stored. By reading the optimal compensation parameters stored in advance from the storage unit 90 into the CPU 110 of the DSP 100, for example, tuning work such as the optimal compensation parameters required for each OPU 2C becomes unnecessary. Accordingly, the setting operation of the optimum compensation parameter required for each OPU 2C is easily and quickly performed. The control method of the optical disc apparatus 1C is easily and rapidly executed by so-called programs such as software and firmware provided in the DSP 100.

  As described above, the optical disc apparatus 1C can execute the setting control method of the optical disc apparatus 1C and the setting method of the optical disc apparatus 1C.

  As a result, the degree of freedom in designing the actuator 50 is improved, and it is possible to provide the optical disc apparatus 1C that can cope with cost reduction.

  As mentioned above, although embodiment of this invention was described, embodiment of the invention mentioned above is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

For example, “CD”, “DVD”, “HD DVD”, “CBHD”, “Blu-ray”
"Data", information, signals, etc. recorded on various media such as various optical disks such as "Disc", etc., and data, information, signals, etc., recorded on various media, such as various writable or rewritable optical disks, etc. The present invention can be applied to a control method of a pickup device, a disc device, and a setting method thereof.

1A, 1B, 1C Optical disk device (disk device)
2A, 2B, 2C OPU (Pickup device)
3 LD (light emitting device)
3I First light source (light source)
3II Second light source (light source)
4 grating (diffraction grating)
5I coupling lens (lens)
5II FMD (front monitor diode)
6 Polarizing member 7 CL (collimator lens)
8 QWP (quarter wave plate)
9 Reflection mirror (mirror)
10I, 10II parallel plate (astigmatism element)
11,12 OBL (Lens)
20 Lens holder (holder)
21 Top wall 22 First side wall (side wall)
23 One side wall (side wall)
24 Other side wall (side wall)
25 Second side wall (side wall)
26, 27 End portion 28 Center portion 31 First focus / tilt coil (coil)
32 Second focus / tilt coil (coil)
33 Tracking coil (coil)
50 Differential actuator (actuator)
61, 62, 63, 64, 65, 66 Suspension wire (support member)
70 Actuator movable main part (actuator main part)
71 Focus / tilt force point (force point)
72 Tracking force point (center)
73 Center of gravity 74 Center of rotation (center)
75 Tilt rotation center axis penetration (rotation center axis penetration)
80 PD (light detector)
81,86 Light receiving area (area)
82,87 Main light receiving part (sensor part)
82a, 82b, 82c, 82d, 83a, 83b, 83c, 83d, 84a, 84b, 84c, 84d, 87a, 87b, 87c, 87d, 88a, 88b, 88c, 88d, 89a, 89b, 89c, 89d segment (light Detection surface)
82x, 82y, 83x, 83y, 84x, 84y, 87x, 87y, 88x, 88y, 89x, 89y Dividing lines 83, 84, 88, 89 Sub-light receiving unit (sensor unit)
85 Same light receiving surface (light receiving surface)
90 ROM (storage unit)
91 Housing 91a Back side (one side)
93 FPC (circuit body)
93a One side portion 94 Insulation sheet (sheet)
95 Circuit conductor (conductor)
96 Protective layer (Protective film)
98,99 Information reading member (information part)
98a, 99a Information recording part (recording part)
100 DSP (control unit)
106 Adder 107 Amplifier 108 Subtractor 110 CPU (Calculation Unit)
111 ROM (memory circuit part)
112 RAM (memory circuit section)
121 First focus servo circuit (servo circuit)
122 Second focus servo circuit (servo circuit)
123 Tracking servo circuit (servo circuit)
131 Other signal adjustment circuit units (signal adjustment circuit units)
141 First focus / tilt signal adjustment circuit unit (adjustment circuit unit)
142 Second Focus / Tilt Signal Adjustment Circuit Unit (Adjustment Circuit Unit)
150 Driver (Drive circuit part)
151 First focus / tilt coil drive circuit section (drive circuit section)
152 Second focus / tilt coil drive circuit section (drive circuit section)
200 discs (media)
210, 220 Signal layer (surface part)
212 tracks 214 track pitch (cycle)
300 Laser light (light)
301 Condensing spot (spot)
302 Main spot (spot)
303,304 Subspot (spot)
312,317 Main detection light spot (spot)
313, 314, 318, 319 Sub-detection light spot (spot)
Dc Tangential direction (direction)
Df Focus direction (optical axis direction)
Dr tracking direction (radial direction)
Dt Tilt direction (oscillation direction)
FO1, FO2, TR Drive signal (signal)
FE Focus error signal TE, TE1, TE2 Tracking error signal TEa1, TEa2 Main push-pull signal (push-pull signal)
TEb1, TEb2, TEc1, TEc2 Sub push-pull signal (push-pull signal)
TEd1, TEd2 Addition sub push-pull signal (push-pull signal)
TILT Correction tilt amount signal Q1, Q2 Compensation value X Software (program)

Claims (19)

An optical element for condensing the light onto the media;
A light receiving element having a sensor unit that is irradiated with the light that is irradiated and reflected by the medium;
Using a pickup device comprising at least a control method of the pickup device for controlling the optical element,
A method for controlling a pickup device, wherein the position of the optical element is calculated by causing the sensor unit to perform an operation based on the light emitted. When concentrating the light on the signal surface portion of the media, a focus servo for focusing the light on the signal surface portion and a track on the signal surface portion are traced so that the light follows the signal surface portion. The control method of the pickup apparatus according to claim 1, further comprising: a tracking servo for controlling the optical element. The method for controlling a pickup device according to claim 1 or 2, wherein tilt control for tilting the optical element in accordance with warping of the media is controlled by differential drive of focus. The tilt angle of the optical element is defined as A,
When the movement amount of the optical element substantially along the radial direction of the medium is defined as M,
The movement amount M is determined based on the following formula (I):
4. The movement amount M is corrected substantially along the radial direction of the medium when the optical element is tilted in response to the warp of the medium. 5. The control method of the pick-up apparatus as described in 2.
M = C × A (I)
(However, the coefficient C in the formula (I) is an arbitrary numerical value.) The signal sent to the coil of the pickup device is calculated using an algorithm based on at least one of or both of the focus error signal and the tracking error signal. A method for controlling the pickup device described above. The method of controlling a pickup device according to claim 5, wherein the signal sent to the coil is calculated based on the following equation (A).

A first focus / tilt coil and a second focus / tilt coil for driving the optical element substantially along at least the optical axis direction of the optical element;
A tracking coil for driving the optical element substantially along a radial direction of the medium;
Using the pickup device comprising:
The drive signal input to the first focus / tilt coil is defined as FO1,
The drive signal input to the second focus / tilt coil is defined as FO2,
The drive signal input to the tracking coil is defined as TR,
A focus error signal detected when a defocus of the light substantially along the optical axis direction of the optical element occurs with respect to the medium is defined as FE,
TE is defined as a tracking error signal detected when the light is defocused substantially along the radial direction of the medium with respect to the medium;
When the correction tilt amount signal for correcting the angle shift of the optical element when the focus angle shift of the light occurs with respect to the media is defined as TILT,
The drive signal input to the first focus / tilt coil is determined based on the following formula (1):
The drive signal input to the second focus / tilt coil is determined based on the following equation (2):
5. The method of controlling a pickup device according to claim 1, wherein the drive signal input to the tracking coil is determined based on the following expression (3).

(However, the coefficients A11, A12, A13, A14, A21, A22, A23, A24, A31, A32, A33, A34 in the equation are arbitrary values.) If necessary, the coefficients A13 and A23 are inputted with arbitrary values excluding zero,
8. The method of controlling a pickup device according to claim 7, wherein the coefficient A23 with respect to the coefficient A13 at that time is a value that is positive or negative. The control method for the pickup device according to claim 7 or 8, wherein an arbitrary value excluding zero is input to the coefficients A14 and A24 as necessary. If necessary, input any value excluding zero to the coefficients A11 and A21,
The method for controlling a pickup device according to any one of claims 7 to 9, wherein the coefficient A21 is different from the coefficient A11 at that time. When rolling is about to occur in the optical element, arbitrary values other than zero are input to the coefficients A13 and A23,
The method for controlling a pickup device according to any one of claims 7 to 10, wherein the values input to the coefficients A13 and A23 are changed according to a rolling frequency of the optical element.   12. A disk device characterized in that the method for controlling a pickup device according to claim 1 can be executed. The actuator pickup device information is extracted from the actuator signal of the pickup device, and the improvement level required for the actuator is investigated,
The investigation result of the improvement level requiring improvement is stored in the information section as information,
A method for setting a disk device, comprising: mounting the pickup device on a disk device, and causing the control unit of the disk device to read the investigation result when the disk device is assembled or after the disk device is assembled. The actuator pickup device information is extracted from the actuator signal of the pickup device, and the improvement level required for the actuator is investigated,
The storage circuit unit stores the investigation result of the improvement level requiring improvement as information,
A method for setting a disk device, comprising: mounting the pickup device on a disk device, and causing the control unit of the disk device to read the investigation result when the disk device is assembled or after the disk device is assembled. In a state where the disk device is completed, an excitation signal is added to the tracking signal of the actuator, and an injection signal level from the tracking error signal to the focus signal is determined using an index when the tracking error signal is maximum. 15. The method for setting a disk device according to claim 13, wherein the disk device is set. Use basic media with minimal tilt in the media,
Light is emitted from the pickup device toward the basic medium,
When the focus of the pickup device with respect to the basic medium is on, the actuator is vibrated in the tracking direction,
The amount of change in the reflection level light from the basic medium at that time and the rolling level of the actuator are measured,
The disk device setting method according to any one of claims 13 to 15, wherein an optimum value of the correction level is obtained based on the measurement result. A disk device setting method according to any one of claims 13 to 16 is executed,
A setting method for a disk device, wherein the method for controlling a pickup device according to any one of claims 1 to 11 is executable.   17. A disk device, wherein the disk device setting method according to claim 13 is executable. The disk device setting method according to any one of claims 13 to 16, is executed,
A disk device characterized in that the method for controlling a pickup device according to any one of claims 1 to 11 can be executed.

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