JP2007109285A - Optical disk device - Google Patents

Optical disk device Download PDF

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Publication number
JP2007109285A
JP2007109285A JP2005297077A JP2005297077A JP2007109285A JP 2007109285 A JP2007109285 A JP 2007109285A JP 2005297077 A JP2005297077 A JP 2005297077A JP 2005297077 A JP2005297077 A JP 2005297077A JP 2007109285 A JP2007109285 A JP 2007109285A
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Japan
Prior art keywords
spherical aberration
focus
recording
reproducing
aberration correction
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JP2005297077A
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Japanese (ja)
Inventor
Koji Iijima
孝治 飯島
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Hitachi Ltd
Hitachi-Lg Data Storage Inc
株式会社日立エルジーデータストレージ
株式会社日立製作所
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Priority to JP2005297077A priority Critical patent/JP2007109285A/en
Publication of JP2007109285A publication Critical patent/JP2007109285A/en
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Abstract

PROBLEM TO BE SOLVED: To accurately and quickly focus a target surface when seeking a desired recording / reproducing surface for an optical disc having a plurality of recording / reproducing surfaces and requiring spherical aberration correction.
A focus drive signal generation circuit 12 drives an objective lens 5 in a focus direction. On the other hand, the spherical aberration correction mechanism drive circuit 10 drives the spherical aberration correction mechanism 7 to a position suitable for each recording / reproducing surface. Here, when seeking is performed on a desired recording / reproducing surface, the objective lens 5 is driven by the focus drive signal generating circuit 12, and the spherical aberration correcting mechanism 7 is moved from the current position to the spherical aberration correcting position for each recording / reproducing surface. By driving to the spherical aberration correction position with respect to the desired recording / reproducing surface, the focus is drawn into the target surface.
[Selection] Figure 5

Description

  The present invention relates to an optical disc apparatus capable of accurately and quickly focusing a target surface when seeking a desired recording / reproducing surface of an optical disc having a plurality of recording / reproducing surfaces.

  In recent years, with the increase in capacity of video information, computer data, etc., as an optical disk medium as a medium for storing them, a recording capacity of 20 GB or more for a single layer and 50 GB for a single layer with two layers instead of a conventional CD or DVD. The Blu-ray Disc possessed is commercially available. In recent years, for the purpose of further increasing the capacity of a disc, a technology for multilayering an optical disc having three or more recording / reproducing layers on one side has been developed.

  In general, the spherical aberration in the optical mechanism is proportional to the error of the distance (cover layer) from the disk surface on the objective lens side to the recording / reproducing layer and the fourth power of the numerical aperture (NA) of the objective lens. Due to the occurrence of spherical aberration, the light spot on the disk surface is defocused. Therefore, compared to conventional CDs and DVDs, the Blu-ray Disc with a smaller cover layer and a larger NA has a recording / reproducing surface that is not used with CDs and DVDs. Therefore, a means for appropriately correcting spherical aberration is required.

  Incidentally, several techniques for performing focus control on a multi-layer disc have been proposed. For example, Patent Document 1 describes means for sequentially changing a control target value by applying an offset value to an objective lens position signal during a focus jump operation for moving a laser spot to a target recording layer. Yes.

JP-A-10-97720

As shown in FIG. 1, when seeking is performed on the recording / reproducing surfaces from the first layer to the fourth layer with respect to an optical disc having four recording / reproducing surfaces and requiring spherical aberration correction, As in the technology, only means for applying an offset value in the focus direction to the objective lens is used. At this time, if the spherical aberration in the optical mechanism is shifted with respect to each recording / reproducing surface, simply applying an offset voltage value in the focusing direction to the objective lens and moving the objective lens causes a desired focus error for defocusing. No signal level is generated. For this reason, when focus pull-in is performed based on a predetermined level of the focus error signal, there is a problem that focus pull-in cannot be stably performed on the target recording / reproducing surface of the fourth layer. (First issue)
Further, as shown in FIG. 2, when seeking is performed on the recording / reproducing surfaces of the first to fourth layers with respect to an optical disc having a four-layer recording / reproducing surface and requiring spherical aberration correction. Then, after driving the spherical aberration correction mechanism to a spherical aberration correction position suitable for the target recording / reproducing surface of the fourth layer, means for applying an offset voltage value in the focus direction to the objective lens and moving it is used. At this time, the processing time until the spherical aberration correction mechanism is driven to a position suitable for the target surface is increased as compared with the focus seek process in the conventional CD or DVD that does not require the spherical aberration correction mechanism. For this reason, as the target number of recording / reproducing surfaces increases, there arises a problem that the time until focus pull-in increases. (Second issue)
An object of the present invention is to accurately and quickly focus on a target surface in an optical disc apparatus that seeks a desired recording / reproducing surface for an optical disc having a plurality of recording / reproducing surfaces that requires spherical aberration correction. It is an object of the present invention to provide an optical disc apparatus and a focus seek method capable of performing the above.

  In the optical disk apparatus according to the present invention, an optical mechanism having an objective lens for condensing laser light on a plurality of recording / reproducing surfaces, a spherical aberration correction mechanism for correcting spherical aberration of the optical mechanism, and a spherical surface for driving the spherical aberration correction mechanism Aberration correction means, focus control means for driving the objective lens in the focus direction, and focus error signal detection means for detecting a focus error signal which is an error between the surface of the optical disc or the recording / reproducing surface and the focal point of the objective lens And a counter that counts the number of recording / reproducing surfaces of the optical disk based on the focus error signal detected by the focus error signal detection means, and the objective lens is stationary with respect to the focus control means based on the counter value. And a controller that issues a command to output a correct focus brake signal. Here, a focus offset voltage value for each recording / reproducing surface is set in advance in the controller. Further, the controller incorporates a spherical aberration correction processing algorithm for calculating a spherical aberration correction value suitable for each recording / reproducing surface by driving the spherical aberration correction mechanism by the spherical aberration correction means. Further, a memory for storing a spherical aberration correction value suitable for each recording / reproducing surface calculated by the spherical aberration correction processing algorithm is provided.

  When seeking to the desired recording / reproducing surface, the objective lens is driven in the focus direction by the focus control means based on the focus offset voltage value preset by the controller, and stored in the memory. Based on the spherical aberration correction value suitable for the recording / reproducing surface, the spherical aberration correcting mechanism drives the spherical aberration correcting mechanism from the current position to the spherical aberration correcting position suitable for the desired recording / reproducing surface. At this time, the controller issues a focus to the desired recording / reproducing surface by issuing a command to output a focus brake signal to the focus control means based on the value of the counter.

  According to the present invention, when an optical disk having a plurality of recording / reproducing surfaces that requires correction of spherical aberration is required, when the desired recording / reproducing surface is sought, the focus is drawn into the target surface accurately and quickly. It is possible.

  Hereinafter, some examples which are embodiments in which the present invention is adopted in an optical disc apparatus will be described in detail with reference to the drawings.

  FIG. 3 shows a configuration example of the optical disc apparatus according to the first embodiment of the present invention. FIG. 4 is a conceptual diagram of the focus seek process in the optical disc apparatus shown in FIG.

  3 is a block diagram of the optical disk apparatus in FIG. 3. An optical pickup 2 that is an optical mechanism includes a laser light emission control circuit 3, a laser light source 4 that emits laser light based on a signal from the laser light emission control circuit 3, and an optical disk 1. An objective lens 5 for condensing the laser light from the laser light source 4, a detector 6 for receiving the reflected light from the optical disk 1, a spherical aberration correction mechanism 7 for correcting the spherical aberration of the optical pickup 2, and the objective lens 5. And a focus actuator 8 for driving in the focus direction.

  The optical disc apparatus also includes a spherical aberration correction mechanism drive circuit 9 and a spherical aberration correction mechanism driver 10 for driving the spherical aberration correction mechanism 7, and generates a focus error signal based on a signal from the detector 6. A focus drive signal generating circuit (FED signal generating circuit) 11 for controlling the focus actuator 8 based on a signal from the focus error signal calculating circuit 11 and a focus actuator driver. 13 is provided.

  Here, the laser emission control circuit 3, the spherical aberration correction mechanism drive circuit 9, and the focus drive signal generation circuit 12 operate based on a command from the microcomputer 14. The microcomputer 14 is preset with a focus offset voltage value and a spherical aberration correction value for each recording / reproducing surface.

  The optical disk device shown in FIG. 3 is characterized in that the current focus control surface is the first layer as shown in FIG. 4 and the focus seek target layer is the fourth layer. Based on the focus offset voltage value set in advance in the microcomputer 14, a command for driving the objective lens 5 in the focus direction is issued to the focus drive signal generation circuit 12, and each recording / reproduction set in the microcomputer 14 in advance. Based on the spherical aberration correction value suitable for the surface, the spherical aberration correction mechanism drive circuit 9 is instructed to gradually drive the spherical aberration correction mechanism 7 to move from the first layer to the fourth layer recording / reproduction surface. The focus is pulled in.

  That is, by driving the objective lens 5 in the focus direction and gradually driving the spherical aberration correction mechanism 7 from the current position to the spherical aberration correction position suitable for the desired recording / reproducing surface, the focus error signal calculation circuit 11 A desired focus error signal can be generated on each recording / reproducing surface. This solves the first problem, which is that the focus cannot be stably pulled in, and the second problem, which is the time until the focus is pulled in compared with the conventional technique. Solve the problem of increasing.

  FIG. 5 shows a configuration example of an optical disk apparatus according to the second embodiment of the present invention. FIG. 6 is a conceptual diagram of focus seek processing in the optical disc apparatus shown in FIG.

  In the block diagram of the optical disc apparatus in FIG. 5, the operations and functions from reference numerals 1 to 13 are the same as those from reference numerals 1 to 13 in FIG.

  As shown in FIG. 6, when the focus error signal detected by the focus error signal calculation circuit 11 detects only a signal (or a small signal) level higher than a predetermined threshold level th1, the counter 15 of the optical disc 1 is used. When the number of recording / reproducing surfaces is counted up, then when the S-shaped signal is detected, the number is counted up, and when only a signal (or a large signal) smaller than a predetermined threshold level th2 is detected. Count up.

  Here, in the microcomputer 14, a focus offset voltage value and a spherical aberration correction value for each recording / reproducing surface are set in advance. Further, the microcomputer 14 instructs the focus drive signal generation circuit 12 to output a focus brake signal that stops the objective lens 5 based on the value of the counter 15. Note that the value of the counter 15 that outputs the focus brake signal is set to −1 of the moving layer.

  The optical disc apparatus shown in FIG. 5 is characterized in that the current focus control surface is the first layer as shown in FIG. 6 and the focus seek target layer is the fourth layer. Based on the focus offset voltage value set in advance in the microcomputer 14, a command for driving the objective lens 5 in the focus direction is issued to the focus drive signal generation circuit 12, and each recording / reproduction set in the microcomputer 14 in advance. Based on the appropriate spherical aberration correction value suitable for the surface, a command to gradually drive the spherical aberration correction mechanism 7 is issued to the spherical aberration correction mechanism drive circuit 9. At this time, the microcomputer 14 issues a command to output the focus brake signal to the focus drive signal generation circuit 12 based on the value of the counter 15, so that the recording / reproducing surfaces of the first layer to the fourth layer are recorded. The focus is pulled in by moving to.

  That is, by driving the objective lens 5 in the focus direction and gradually driving the spherical aberration correction mechanism 7 from the current position to a spherical aberration correction position suitable for a desired recording / reproducing surface, the focus error signal calculation circuit 11 A desired focus error signal can be generated on each recording / reproducing surface. Further, since the counter 15 can accurately count the number of recording / reproducing surfaces, the microcomputer 14 can accurately issue a command to output a focus brake signal to the focus drive signal generation circuit 12. This solves the first problem that the focus cannot be pulled in stably, and the second problem that the time until the focus pull is increased as compared with the conventional technique is increased. To solve the problem of

  FIG. 7 is a flowchart for explaining a focus seek process in the optical disc apparatus shown in FIG.

  First, in S701 of FIG. 7, the value (M) = 4 of the moving layer is set. Next, in S702, the value of the counter 15 is reset. In S703, the target counter value (N) for outputting the focus brake signal to the focus drive signal generation circuit 12 by the microcomputer 14 is set to the value (4) -1 = 3 of the moving layer. In S704, it is checked whether the value of the counter 15 is the value of the moving layer = 4. Further, in S705, it is checked whether the value of the counter 15 is a target value for outputting the focus brake signal. In S706, the focus offset voltage value set in advance in the microcomputer 14 is given to the focus drive signal generation circuit 12 to drive the objective lens 5 in the focus direction, and each recording / reproducing surface set in the microcomputer 14 in advance. Is applied to the spherical aberration correction mechanism drive circuit 9 to drive the spherical aberration correction mechanism 7. In step S <b> 707, the microcomputer 14 instructs the focus drive signal generation circuit 12 to output a focus brake signal. Finally, in S708, when the value of the counter 15 is the fourth layer, the focus is drawn into the recording / reproducing surface.

  FIG. 8 shows a configuration example of an optical disc apparatus according to the third embodiment of the present invention. FIG. 6 is a conceptual diagram of the focus seek process in the optical disc apparatus shown in FIG.

  In the block diagram of the optical disk apparatus in FIG. 8, the operations and functions of reference numerals 1 to 13 and 15 are the same as those of reference numerals 1 to 13 in FIG. 3 of the first embodiment and reference numeral 15 in FIG. 5 of the second embodiment. Therefore, the description thereof is omitted.

  In the microcomputer 14, a focus offset voltage value and a spherical aberration correction value for each recording / reproducing surface are set in advance. Further, the microcomputer 14 instructs the focus drive signal generation circuit 12 to output a focus brake signal that stops the objective lens 5 based on the value of the counter 15. Further, the microcomputer 14 incorporates a spherical aberration correction processing algorithm A for driving the spherical aberration correction mechanism 7 by the spherical aberration correction mechanism driving circuit 9 and calculating a spherical aberration correction value suitable for each recording / reproducing surface. Yes.

  Further, the memory 16 stores a spherical aberration correction value suitable for each recording / reproducing surface calculated by the spherical aberration correction processing algorithm A.

  Further, the detection signal calculation circuit 17 detects a predetermined signal of the disk 1 necessary for calculating the spherical aberration correction value based on the signal from the detector 6, and sends the result to the microcomputer 14 to send a spherical signal. It is processed in the aberration correction processing algorithm A.

Here, the spherical aberration correction processing algorithm A will be described.
In the spherical aberration correction processing algorithm A, first, the spherical aberration correction mechanism 7 is driven by setting spherical aberration values in stages to the spherical aberration correction mechanism driving circuit 9. At this time, a predetermined signal detected by the detection signal calculation circuit 17 is sent to the microcomputer 14 for each set spherical aberration value. In the spherical aberration correction processing algorithm A, the focus actuator 8 is driven by setting the focus offset voltage value to the focus drive signal generation circuit 12 step by step. At this time, a predetermined signal detected by the detection signal calculation circuit 17 is sent to the microcomputer 14 for each set focus offset voltage value. Further, in the spherical aberration correction processing algorithm, a spherical aberration correction value suitable for each recording / reproducing surface is calculated by using a calculation value based on a predetermined signal sent to the microcomputer 14.

  The predetermined signal in the detection signal calculation circuit 17 used for calculating the spherical aberration correction value is, for example, any one of a tracking error signal, an RF signal, and a wobble signal, and an calculated value based on the predetermined signal Is, for example, any of tracking error signal amplitude, jitter, error rate, RF signal amplitude, and wobble signal amplitude.

  In addition, by incorporating the spherical aberration correction processing algorithm A, it is possible to correct a plate thickness error that occurs in the manufacturing process of the optical disc 1. As a result, the spherical aberration can be corrected more appropriately than in the second embodiment, so that the recording / reproducing performance of the optical disc apparatus is improved.

  The optical disc apparatus shown in FIG. 8 is characterized in that the current focus control surface is the first layer as shown in FIG. 6 and the focus seek target layer is the fourth layer. Based on the focus offset voltage value set in advance in the microcomputer 14, a command for driving the objective lens 5 in the focus direction is issued to the focus drive signal generation circuit 12, and each recording / reproduction surface stored in the memory 16. Based on the spherical aberration correction value suitable for the above, the microcomputer 14 issues a command to gradually drive the spherical aberration correction mechanism 7 to the spherical aberration correction mechanism drive circuit 9. At this time, the microcomputer 14 issues a command to output the focus brake signal to the focus drive signal generation circuit 12 based on the value of the counter 15, so that the recording / reproducing surfaces of the first layer to the fourth layer are recorded. The focus is pulled in by moving to.

  That is, by driving the objective lens 5 in the focus direction and gradually driving the spherical aberration correction mechanism 7 from the current position to a spherical aberration correction position suitable for a desired recording / reproducing surface, the focus error signal calculation circuit 11 A desired focus error signal can be generated on each recording / reproducing surface. Further, since the counter 15 can accurately count the number of recording / reproducing surfaces, the microcomputer 14 can accurately issue a command to output a focus brake signal to the focus drive signal generation circuit 12. This solves the problem that the first problem, that is, the focus cannot be stably pulled, and increases the time until the focus is pulled compared to the second problem that is the conventional problem. Solve the problem.

  FIG. 7 is a flowchart for explaining a focus seek process in the optical disc apparatus shown in FIG.

  Each process of S701 to S705 and S707 to S706 in FIG. 7 is the same as that described in the second embodiment. In S706, the focus offset voltage value preset in the microcomputer 14 is given to the focus drive signal generation circuit 12. Then, the objective lens 5 is driven in the focus direction, and a spherical aberration correction value suitable for each recording / reproducing surface stored in the memory 16 is given to the spherical aberration correction mechanism driving circuit 9 to To drive.

The figure which showed the 1st subject in a prior art. The figure which showed the 2nd subject in a prior art. 1 is a block diagram of an optical disc apparatus that is Embodiment 1 of the present invention. FIG. 5 is a diagram illustrating focus seek processing according to the first embodiment of the present invention. FIG. 3 is a block diagram of an optical disc apparatus that is Embodiment 2 of the present invention. The figure which showed the focus seek process of Example 2 or Example 3 of this invention. 10 is a flowchart for explaining a focus seek process according to the second or third embodiment of the present invention. FIG. 6 is a block diagram of an optical disc apparatus that is Embodiment 3 of the present invention.

Explanation of symbols

1 ... optical disc having a plurality of recording / reproducing layers, 2 ... optical pickup,
3 ... Laser emission control circuit, 4 ... Laser light source, 5 ... Objective lens,
6 ... detector, 7 ... spherical aberration correction mechanism, 8 ... focus actuator, 9 ... driver for spherical aberration correction, 10 ... spherical aberration correction mechanism drive circuit,
DESCRIPTION OF SYMBOLS 11 ... Focus error signal arithmetic circuit, 12 ... Focus drive signal generation circuit,
13 ... Focus actuator driver, 14 ... Microcomputer,
15 ... Counter, 16 ... Memory, 17 ... Detection signal calculation circuit,
A: Spherical aberration correction processing algorithm.

Claims (6)

  1. In an optical disc apparatus that seeks a desired recording / reproducing surface for an optical disc having a plurality of recording / reproducing surfaces,
    An optical mechanism having an objective lens for condensing laser light on the plurality of recording / reproducing surfaces;
    A spherical aberration correction mechanism for correcting the spherical aberration of the optical mechanism;
    Spherical aberration correction means for driving the spherical aberration correction mechanism;
    Focus control means for driving the objective lens in the focus direction;
    Detecting means for detecting a signal by reflected light from the surface or recording / reproducing surface of the optical disc,
    When seeking to the desired recording / reproducing surface, the objective lens is driven in the focus direction by the focus control means, and the spherical aberration correcting mechanism is driven by the spherical aberration correcting means, so that it is suitable for the desired recording / reproducing surface. By correcting the spherical aberration and detecting the signal from the recording / reproducing surface by the detecting means,
    An optical disc apparatus characterized by performing focus pull-in on a desired recording / reproducing surface.
  2. In an optical disc apparatus that seeks to a desired recording / reproducing surface for an optical disc having a plurality of recording / reproducing surfaces,
    An optical mechanism having an objective lens for condensing laser light on the plurality of recording / reproducing surfaces;
    A spherical aberration correction mechanism for correcting the spherical aberration of the optical mechanism;
    Spherical aberration correction means for driving the spherical aberration correction mechanism;
    Focus control means for driving the objective lens in the focus direction;
    Detection means for detecting a signal by reflected light from the surface or recording / reproducing surface of the optical disc;
    A focus error signal detecting means for detecting a focus error signal which is an error between the surface of the optical disc or the recording / reproducing surface and the focal point of the objective lens;
    When seeking to the desired recording / reproducing surface, the objective lens is driven in the focus direction by the focus control means, and the spherical aberration correcting mechanism is driven by the spherical aberration correcting means, so that it is suitable for the desired recording / reproducing surface. An optical disc apparatus characterized in that a spherical aberration is corrected and a focus error signal is detected by the focus error signal detecting means, thereby performing focus pull-in on a desired recording / reproducing surface.
  3. The optical disk apparatus according to claim 2, wherein
    A counter for counting the number of recording / reproducing surfaces of the optical disc based on the focus error signal detected by the focus error signal detecting means;
    When seeking to the desired recording / reproducing surface, the objective lens is driven in the focus direction by the focus control means, and the spherical aberration correcting mechanism is driven by the spherical aberration correcting means to obtain the desired recording / reproducing surface. An optical disc apparatus characterized in that suitable spherical aberration correction is performed and focus pull-in is performed on a desired recording / reproducing surface based on the value of the counter.
  4. The optical disk apparatus according to claim 3,
    A controller for instructing the focus control means to output a focus brake signal to stop the objective lens based on the value of the counter;
    When seeking to the desired recording / reproducing surface, the objective lens is driven in the focus direction by the focus control means, and the spherical aberration correcting mechanism is driven by the spherical aberration correcting means to obtain the desired recording / reproducing surface. The controller performs appropriate spherical aberration correction, and the controller instructs the focus control means to output a focus brake signal based on the value of the counter, thereby bringing the focus into the desired recording / reproducing surface. An optical disc device characterized in that the optical disc device is provided.
  5. In an optical disc apparatus that seeks a desired recording / reproducing surface for an optical disc having a plurality of recording / reproducing surfaces,
    An optical mechanism having an objective lens for condensing laser light on the plurality of recording / reproducing surfaces;
    A spherical aberration correction mechanism for correcting the spherical aberration of the optical mechanism;
    Spherical aberration correction means for driving the spherical aberration correction mechanism;
    Focus control means for driving the objective lens in the focus direction;
    Detection means for detecting a signal by reflected light from the surface or recording / reproducing surface of the optical disc;
    A focus error signal detecting means for detecting a focus error signal which is an error between a surface of the optical disc or a recording / reproducing surface and a focal point of the objective lens;
    A controller for setting a focus offset voltage value and a spherical aberration correction value for each recording / reproducing surface in advance is provided.
    When seeking to the desired recording / reproducing surface, the objective lens is driven in the focus direction by the focus control means based on the focus offset voltage value preset by the controller, and the controller Based on the spherical aberration correction value for each set recording / reproducing surface, the spherical aberration correcting mechanism drives the spherical aberration correcting mechanism to perform spherical aberration correction suitable for a desired recording / reproducing surface, and the focus error. By detecting the focus error signal by the signal detection means,
    An optical disc apparatus characterized by performing focus pull-in on a desired recording / reproducing surface.
  6. In an optical disc apparatus that seeks a desired recording / reproducing surface for an optical disc having a plurality of recording / reproducing surfaces,
    An optical mechanism having an objective lens for condensing laser light on the plurality of recording / reproducing surfaces;
    A spherical aberration correction mechanism for correcting the spherical aberration of the optical mechanism;
    Spherical aberration correction means for driving the spherical aberration correction mechanism;
    Focus control means for driving the objective lens in the focus direction;
    Detection means for detecting a signal by reflected light from the surface or recording / reproducing surface of the optical disc;
    A focus error signal detecting means for detecting a focus error signal which is an error between a surface of the optical disc or a recording / reproducing surface and a focal point of the objective lens;
    A spherical aberration correction processing algorithm for calculating a spherical aberration correction value suitable for each recording / reproducing surface by driving the spherical aberration correcting mechanism by the focus aberration voltage value for each recording / reproducing surface and the spherical aberration correcting unit in advance. With a built-in controller,
    A memory for storing a spherical aberration correction value suitable for each recording / reproducing surface calculated by the spherical aberration correction processing algorithm;
    When seeking to the desired recording / reproducing surface, the objective lens is driven in the focus direction by the focus control means based on the focus offset voltage value preset by the controller, and the memory Based on the stored spherical aberration correction value suitable for each recording / reproducing surface, the spherical aberration correcting mechanism is driven by the spherical aberration correcting means to perform spherical aberration correction suitable for a desired recording / reproducing surface, An optical disc apparatus characterized in that a focus error signal is detected by a focus error signal detection means, thereby performing focus pull-in on a desired recording / reproducing surface.
JP2005297077A 2005-10-12 2005-10-12 Optical disk device Pending JP2007109285A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008103039A (en) * 2006-10-20 2008-05-01 Kenwood Corp Disk reproducing device
JP2009140543A (en) * 2007-12-05 2009-06-25 Hitachi Ltd Optical disk reproducing system
JP2009301596A (en) * 2008-06-10 2009-12-24 Hitachi Ltd Focus locking method and optical disc apparatus
WO2010116632A1 (en) * 2009-04-10 2010-10-14 パナソニック株式会社 Optical disk device and interlayer jump method for multilayer optical disk
JP2010231840A (en) * 2009-03-27 2010-10-14 Hitachi Ltd Optical disk device
JP2010287276A (en) * 2009-06-11 2010-12-24 Funai Electric Co Ltd Optical disk device
CN102543112A (en) * 2010-12-22 2012-07-04 Jvc建伍株式会社 Optical disc apparatus, focus search method, and focus search program

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10188294A (en) * 1996-10-29 1998-07-21 Toshiba Ave Corp Device and method for controlling focus of multilayer optical disk reproducing system
JP2002157750A (en) * 2000-09-06 2002-05-31 Matsushita Electric Ind Co Ltd Optical disk unit and information recording and reproducing method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10188294A (en) * 1996-10-29 1998-07-21 Toshiba Ave Corp Device and method for controlling focus of multilayer optical disk reproducing system
JP2002157750A (en) * 2000-09-06 2002-05-31 Matsushita Electric Ind Co Ltd Optical disk unit and information recording and reproducing method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008103039A (en) * 2006-10-20 2008-05-01 Kenwood Corp Disk reproducing device
JP2009140543A (en) * 2007-12-05 2009-06-25 Hitachi Ltd Optical disk reproducing system
JP2009301596A (en) * 2008-06-10 2009-12-24 Hitachi Ltd Focus locking method and optical disc apparatus
JP2010231840A (en) * 2009-03-27 2010-10-14 Hitachi Ltd Optical disk device
WO2010116632A1 (en) * 2009-04-10 2010-10-14 パナソニック株式会社 Optical disk device and interlayer jump method for multilayer optical disk
US8582403B2 (en) 2009-04-10 2013-11-12 Panasonic Corporation Optical disc apparatus and method of making layer-to-layer jump in multilayer optical disc
JP5615264B2 (en) * 2009-04-10 2014-10-29 パナソニック株式会社 Optical disc apparatus and interlayer jump method in multilayer optical disc
JP2010287276A (en) * 2009-06-11 2010-12-24 Funai Electric Co Ltd Optical disk device
CN102543112A (en) * 2010-12-22 2012-07-04 Jvc建伍株式会社 Optical disc apparatus, focus search method, and focus search program
CN102543112B (en) * 2010-12-22 2014-11-26 Jvc建伍株式会社 Optical disc apparatus, and focus search method

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