JP4556117B2 - Optical pickup control device, optical pickup control method, and disk drive device - Google Patents

Description

  The present invention relates to an optical pickup control device, an optical pickup control method, and a disk drive device, and particularly to a disk drive device that records or reproduces data on a Blu-ray Disc (registered trademark: Blu-ray Disc). Is preferred.

  In recent years, in a disk drive device compliant with the Blu-ray Disc standard, a high-density optical disk (hereinafter referred to as a groove recording structure) having a cover layer of 0.1 mm in the thickness direction of the disk and recording on either a convex portion or a concave portion of a track. (Referred to simply as “optical disc”) and a conventional DVD (Digital Versatile Disc) using a blue laser with a wavelength of 405 nm and a laser beam whose numerical aperture (NA) is further reduced by an objective lens to 0.85. On the other hand, the recording marks are read and written at a surface recording density of 5 times.

  In addition, this type of optical disc has also been developed with a so-called double layer structure in which a recording film of two layers on one side is formed, and has a recording capacity approximately twice that of a single layer optical disc.

  In such a disc drive device compliant with the Blu-ray Disc standard, a focus servo for focusing the laser beam on the disc recording surface and a tracking servo for tracing the laser beam to a track (pit row or groove) on the disc In particular, with respect to the focus servo, it is known to perform an appropriate servo operation via the objective lens by applying an appropriate focus bias to the focus loop.

  Further, in the disk drive device, it is necessary to perform spherical aberration correction in order to cope with a thickness error of the cover layer in the optical disk and a multilayered recording layer such as a double layer. For example, an expander is provided in the optical pickup. A spherical aberration correction mechanism using a lens or a liquid crystal element is provided.

  In this disk drive device, when an optical disk is actually loaded and a layer to be subjected to focus servo is set for the first time, and after the multilayer optical disk is inserted, a focus jump is performed from the first layer to which focus servo is applied to other layers. When setting the destination layer to be performed, the spherical aberration correction mechanism is moved based on the spherical aberration correction initial value corresponding to the layer to be focused, and based on the focus bias initial value corresponding to the layer to be focused. A biaxial actuator for focusing the laser beam on the recording surface of the optical disk is moved.

In such a disk drive device, by adjusting the focus bias value and the spherical aberration correction value so that the amplitude of the tracking error signal is optimized when the focus servo is turned off when the disk is inserted or during recording / reproducing of the disk. In some cases, an optimum focus bias value and spherical aberration correction value having sufficient recording / reproduction characteristics for various adjustments using an RF signal are obtained (for example, see Patent Document 1).
JP 2004-95106 A

By the way, spherical aberration is caused by disc cover thickness error, optical pickup manufacturing variation, change over time of the optical pickup, temperature characteristics, etc., and focus bias also includes optical disc characteristic error and optical pickup manufacturing variation. This occurs due to a change with time and temperature characteristics of the optical pickup.

  Therefore, in the disk drive device, when the spherical aberration correction value and the focus bias value initial setting value corresponding to each layer are not adjusted at the time of shipment from the factory, the focus servo is applied in a state including all the above errors, or the focus bias value is adjusted. There is a problem that the spherical aberration correction value and the focus bias value cannot be set to optimum values due to the error.

  Also, in the disk drive device, when the spherical aberration correction value and the focus bias value initial setting value corresponding to each layer are adjusted at the time of shipment from the factory (for example, using an optical disk whose cover thickness error is known, the initial manufacturing variation of the optical pickup is reduced. Even if the optical pickup is adjusted or the initial manufacturing variability of the optical pickup is adjusted using an optical disc whose disc characteristics are already known), there is an error in the optical pickup over time, temperature characteristics, cover thickness error, or disc characteristics. There is a problem in that it cannot cope with media larger than expected, and the spherical aberration correction value and the focus bias value cannot be set to optimum values due to the error.

  The present invention has been made in consideration of the above points. The spherical aberration correction value and the focus can be applied even to an optical disc in which an optical pick-up change, temperature characteristics, cover thickness error, and disc characteristic error are larger than expected. It is an object of the present invention to propose an optical pickup control device, an optical pickup control method, and a disk drive device capable of accurately performing recording or reproduction on an optical disc by setting the bias value to an optimum value.

In order to solve such a problem, the present invention provides a control device for a disk drive device that records or reproduces data on an optical disk via an optical pickup, and corrects spherical aberration for the optical disk based on a spherical aberration correction value. Correction means, focus bias adjusting means for adjusting focus servo for the optical disk based on the focus bias value, and wobbling groove following the focus servo ON operation as the first processing for the recording layer of the optical disk inserted in the disk drive device When the reading of image data fails, the shift amount of the spherical aberration correction value with respect to the recording layer is a spherical aberration shift amount ± α, and the shift amount of the focus bias value is a focus bias shift amount ± β. Aberration correction initial value and The initial value of the bias bias is regarded as the origin of the two-dimensional plane, and the first process is retried while sequentially moving the retry start position shifted from the origin by a certain amount around the origin in a predetermined order. A first trial means for searching for a spherical aberration correction value and a focus bias value that are most suitable for the first processing, and the first aberration means based on the spherical aberration correction value and the focus bias value that are most suitable for the first processing. When the processing is successful, it is determined whether or not the reproduction signal can be read from the optical disc as the next second processing. If a negative result is obtained, the spherical surface when the first processing is successful is obtained. Aberration correction value and focus bias value are re-recognized as the origin of the two-dimensional plane. Second trial means for searching for a spherical aberration correction value and a focus bias value that are most suitable as the second process by retrying the second process while sequentially moving the retry start positions in turn. It was made to provide.
As a result, the first process is retried while sequentially moving the retry start position shifted by a fixed amount from the origin of the spherical aberration correction initial value and the focus bias initial value as the first process. After searching for the spherical aberration correction value and focus bias value that seems to be most appropriate, the spherical aberration correction value and focus bias value are taken as the origin of the two-dimensional plane again, and the retry is shifted from the origin by a fixed amount around the origin. By retrying the second process while sequentially moving the start position, it is possible to search for a spherical aberration correction value and a focus bias value that are considered to be most suitable as the second process. Execute the first process and the second process accurately and reliably Door can be.

According to the present invention, there is also provided a method of controlling a disk drive device that records or reproduces data on an optical disk via an optical pickup. The first process for the recording layer of the optical disk inserted in the disk drive device is a focus servo function. When reading of the wobbling groove following the ON operation has failed, the shift amount of the spherical aberration correction value with respect to the recording layer is a spherical aberration shift amount ± α, and the shift amount of the focus bias value is a focus bias shift amount ± β. In the plane, the predetermined spherical aberration correction initial value and the focus bias initial value are regarded as the origin of the two-dimensional plane, and the retry start position shifted from the origin by a predetermined amount around the origin is sequentially moved in a predetermined order. The first trial means for retrying the process of No. 1 A first trial step for searching for a spherical aberration correction value and a focus bias value that are most suitable for the first processing, and the first step based on the spherical aberration correction value and the focus bias value that are most suitable for the first processing. When the processing is successful, it is determined whether or not the reproduction signal can be read from the optical disc as the next second processing. If a negative result is obtained, the spherical surface when the first processing is successful is obtained. Second trial means for retrying the second process while sequentially recognizing the aberration correction value and the focus bias value as the origin of the two-dimensional plane and sequentially moving the retry start positions shifted from the origin by a fixed amount around the origin. To search for a spherical aberration correction value and a focus bias value that seem to be most suitable as the second process. A second trial step.
As a result, the first process is retried while sequentially moving the retry start position shifted by a fixed amount from the origin of the spherical aberration correction initial value and the focus bias initial value as the first process. After searching for the spherical aberration correction value and focus bias value that seems to be most appropriate, the spherical aberration correction value and focus bias value are taken as the origin of the two-dimensional plane again, and the retry is shifted from the origin by a fixed amount around the origin. By retrying the second process while sequentially moving the start position, it is possible to search for a spherical aberration correction value and a focus bias value that are considered to be most suitable as the second process. Execute the first process and the second process accurately and reliably Door can be.

Further, in the present invention, the focus A disk drive apparatus for recording or reproducing data on an optical disc via an optical pickup, as the first treatment given to the recording layer of the optical disc inserted in the disc drive device Processing means for executing reading of the wobbling groove following the servo-on operation or reading of a reproduction signal from the optical disk as a predetermined second process , and spherical aberration correction for correcting spherical aberration for the optical disk based on the spherical aberration correction value Means, focus bias adjusting means for adjusting focus servo for the optical disk based on the focus bias value, and spherical aberration for the recording layer when the first processing for the recording layer of the optical disk inserted in the disk drive device fails. Set the shift amount of the correction value to sphere. In a two-dimensional plane with an aberration shift amount ± α and a focus bias value shift amount ± β, the predetermined spherical aberration correction initial value and focus bias initial value are regarded as the origin of the two-dimensional plane, and the origin By retrying the first process while sequentially moving the retry start position shifted from the origin by a certain amount around the center in a predetermined order, the spherical aberration correction value and the focus which are considered to be most suitable as the first process When the first process is successful by the first trial means for searching for the bias value and the spherical aberration correction value and the focus bias value which are considered to be most suitable as the first process, the following second process can be performed. If a negative result is obtained, the spherical aberration correction value when the first process is successful and By reinterpreting the focus bias value as the origin of the two-dimensional plane and retrying the second process while sequentially moving the retry start positions shifted from the origin by a fixed amount around the origin, the second process is performed. A second trial means for searching for a spherical aberration correction value and a focus bias value, which are most suitable for the processing, is provided.
As a result, the first process is retried while sequentially moving the retry start position shifted by a fixed amount from the origin of the spherical aberration correction initial value and the focus bias initial value as the first process. After searching for the spherical aberration correction value and focus bias value that seems to be most appropriate, the spherical aberration correction value and focus bias value are taken as the origin of the two-dimensional plane again, and the retry is shifted from the origin by a fixed amount around the origin. By retrying the second process while sequentially moving the start position, it is possible to search for a spherical aberration correction value and a focus bias value that are considered to be most suitable as the second process. Execute the first process and the second process accurately and reliably Door can be.

According to the present invention, the first process is retried while sequentially moving the retry start position shifted from the origin by a fixed amount around the origin of the spherical aberration correction initial value and the focus bias initial value. After searching for the spherical aberration correction value and the focus bias value that seem to be most suitable for the above processing, the spherical aberration correction value and the focus bias value are again regarded as the origin of the two-dimensional plane, and a fixed amount from the origin with the origin as the center. By retrying the second process while sequentially moving the shifted retry start position, it is possible to search for a spherical aberration correction value and a focus bias value that are most suitable for the second process. Perform the first and second processing on the recording layer accurately and reliably Rukoto can, thus it is possible to realize the 1st processing and the second processing accurate and reliable control of the optical pickup can perform apparatus, the optical pickup control method and a disk drive apparatus for the optical disc.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) Circuit Configuration of Disk Drive Device In FIG. 1, reference numeral 1 denotes a disk drive device of the present invention as a whole, and a microcomputer 6 as a control device is an optical pickup according to a basic program or application program stored in a nonvolatile memory 11 3 and the entire disk drive device 1 are controlled in an integrated manner, operate according to read / write commands supplied from the outside, and record or reproduce data on the optical disk 2. .

  The optical disc 2 is placed on a turntable (not shown), and is rotated by a spindle motor (not shown) when accessing (recording or reproducing) data. The data recorded on the optical disc 2 by the optical pickup 3 or ADIP by a wobbling groove is used. (Address In PreGroove) Information is read.

  Here, as shown in FIG. 2, the optical pickup 3 emits the laser light L1 through the laser diode 20, and collimator lens 21, beam splitter 22, movable lens 23A of expander 23 for correcting the spherical aberration of the laser light, The signal recording surface of the optical disc 2 is irradiated with the laser light L1 sequentially through the fixed lens 23B and the objective lens 24 serving as an output end of the laser light.

  In this optical pickup 3, the expander 23 corrects the spherical aberration of the laser light L 1 that occurs because the numerical aperture of the objective lens 24 is relatively large and the thickness of the cover layer on the signal recording surface of the optical disk 2 is relatively thin. It is made to be able to do.

  Here, the movable lens 23A of the expander 23 is held by an actuator 27 so as to be movable in the direction of arrow a or b. In the disk drive device 1, the actuator 27 is based on the expander servo signal CE from the microcomputer 6. Is controlled so that the spherical aberration of the laser light L1 can be corrected appropriately.

  The objective lens 24 is held by a biaxial actuator 28 so as to be movable in the focus direction (that is, the direction of arrow a or b) and the tracking direction, and based on the focus servo signal CF from the microcomputer 6, the biaxial actuator 28. Is controlled so that the laser beam L1 is focused on the signal recording surface of the optical disc 2.

  Then, the optical pickup 3 reflects the reflected laser beam L2 reflected by the signal recording surface of the optical disc 2 by the beam splitter 22 through the objective lens 24, the fixed lens 23B and the movable lens 23A of the expander 23 in order, and causes the collimator lens 25 to be reflected. And irradiates the photodetector 26 via

  The photodetector 26 has a plurality of photodiodes, and each photodiode receives reflected light from the optical disk 2 and photoelectrically converts it, generates a received light signal SD corresponding to the received light quantity, and generates a servo error signal. The data is sent to the generation circuit 4 (FIG. 1).

  The servo error signal generation circuit 4 generates a focus servo error signal FE 1 based on the light reception signal SD supplied from the optical pickup 3 and sends it to the analog / digital converter 5. The analog / digital converter 5 digitally converts the focus servo error signal FE 1 and sends it to the adder 7 of the microcomputer 6.

  On the other hand, the sequence monitoring unit 9 of the microcomputer 6 monitors whether the processing is successful or unsuccessful at each stage such as when the focus servo is turned on, when reading the wobbling groove, when reading the reproduction RF signal, etc. When it is determined that the process at each stage has failed, a command for focusing the laser beam on the signal recording surface of the optical disc 2 is output to the adjustment value calculation unit 10. Yes.

  Here, the optical pickup 3 uses the expander servo signal CE corresponding to the spherical aberration correction initial value set in advance at the time of factory shipment or the like and the focus servo signal CF corresponding to the initial focus bias value to adjust the focus servo in each stage. The on-operation, the reading of the wobbling groove, and the reading of the reproduction RF signal are performed. The optical disc 2 in which the change with time, temperature characteristics, cover thickness error, and disk characteristic error of the optical pickup 3 are larger than expected. The process at each stage may fail due to the error.

  For example, when the process at the time of turning on the focus servo fails and the adjustment value calculating unit 10 receives an in-focus command from the sequence monitoring unit 9, the signal of the optical disc 2 can be turned on so that the focus servo can be turned on. In order to adjust the focus of the laser beam with respect to the recording surface, the spherical aberration shift amount ± α for shifting the spherical aberration correction initial value by a certain amount is sent to the spherical aberration correction value setting unit 13 and the focus bias initial value is shifted by a certain amount. For this purpose, a focus bias shift amount ± β is sent to the focus bias setting unit 8.

  Similarly, the adjustment value calculation unit 10 receives a focusing command from the sequence monitoring unit 9 when processing at each stage such as subsequent reading of the wobbling groove or reading of the reproduction RF signal fails. Similarly, the spherical aberration correction shift amount ± α is sent to the spherical aberration correction value setting unit 13 so that the reading of the wobbling groove and the reproduction RF signal can be performed, and the focus bias shift amount ± β is set. It is sent to the focus bias setting unit 8.

  The spherical aberration correction value setting unit 13 generates a spherical aberration correction value CH in which the spherical aberration correction shift amount ± α is added to the initial spherical aberration correction initial value, and this is converted into a digital analog via the digital / analog converter 16. The spherical aberration correction signal S1 generated by the conversion is sent to the driver circuit 17.

  The driver circuit 17 generates an expander servo signal CE based on the spherical aberration correction signal S1, and supplies the expander servo signal CE to the actuator 27 of the optical pickup 3, thereby moving the movable lens 23A of the expander 23 in the direction of arrow a or b. To correct spherical aberration.

  The focus bias setting unit 8 generates a focus bias value FB in which the focus bias shift amount ± β is added to the focus bias initial value, and sends this to the adder 7. The adder 7 generates a focus error signal FE2 obtained by adding a focus bias to the focus error signal FE1 by adding the focus bias value FB to the digitally converted focus error signal FE1, and processing the servo error filter FE1 After being converted into a focus error signal S 2 via the unit 12 and the digital / analog converter 14, it is sent to the driver circuit 15.

  The driver circuit 15 generates a focus servo signal CF based on the focus error signal S2, and supplies the focus servo signal CF to the biaxial actuator 28 of the optical pickup 3, thereby moving the objective lens 24 in the direction of the arrow a or b to change the optical disk. The laser beam L1 can be focused on the second signal recording surface.

(2) Spherical Aberration Correction and Focus Bias Correction in the Disk Drive Device Actually, in the microcomputer 6 of the disk drive device 1, as a first step, for example, when the optical disk 2 having a double layer structure is inserted, the spherical aberration correction is first performed. The spherical aberration correction initial value for the first layer (L0 layer) is set as the value CH, and the focus bias initial value for the first layer (L0 layer) is set as the focus bias value FB. In the disk drive apparatus 1, fixed values determined by design are used for both the spherical aberration correction initial value and the focus bias initial value.

  Then, as the second stage, the microcomputer 6 of the disk drive apparatus 1 focuses on the first layer (L0 layer) of the optical disk 2 using the spherical aberration correction initial value and the focus bias initial value set in the first stage. Turn on the servo. However, when the optical disk 2 has a single layer structure, the disk drive device 1 turns on the focus servo for the first layer, which is the only signal recording surface.

  Next, as a third stage, the disk drive device 1 microcomputer 6 performs the spherical aberration optimum adjustment process and the focus bias optimum adjustment process using the push-pull signal and the reproduction RF signal in the first layer (L0 layer), and the optical disk. 2 to read disc information.

  Subsequently, when the disk drive apparatus 1 microcomputer 6 succeeds in reading the disk information in the third stage as the fourth stage, in the case of the optical disk 2 having the double layer structure, the second layer (L1 layer) is used as the spherical aberration correction value CH. ) Spherical aberration correction initial value is set, and the focus bias initial value for the second layer (L1 layer) is set as the focus bias value FB, and then the optical pickup 3 is focus jumped to the second layer (L1 layer) Let The disk drive device 1 employs fixed values determined by design for both the spherical aberration correction initial value and the focus bias initial value in the second layer (L1 layer).

  Finally, as the fifth stage, the disk drive device 1 microcomputer 6 performs the spherical aberration optimum adjustment process and the focus bias optimum adjustment process using the push-pull signal and the reproduction RF signal in the second layer (L1 layer). It is designed to read information.

  In such a disk drive device 1, spherical aberration correction is essential, and in order to perform optimum recording / reproduction with respect to the optical disk 2, the spherical aberration correction value CH and the focus bias value FB are set according to the medium of the optical disk 2. It is necessary to adjust to the optimum state.

  On the contrary, in the disk drive device 1, if the spherical aberration correction value CHC and the focus bias value FB are too far from the optimum values, the first focus servo to the first layer (L0 layer) after the optical disk 2 is inserted. Something that can't even happen.

  Even if the focus servo can be turned on somehow in the disk drive device 1, the disk information reading, the spherical aberration optimum adjustment process, and the focus bias optimum adjustment process may fail.

  In the disk drive device 1, the same applies to the first focus jump from the first layer (L0 layer) to the second layer (L1 layer), and the optimum spherical aberration correction amount of the second layer (L1 layer) is determined in advance. Since it is impossible to know, there is no choice but to focus jump with the spherical aberration correction initial value and the focus bias initial value.

  In a normally conceivable range (combination of the medium of the optical disc 2 manufactured within the format standard and the optical pickup 3 manufactured within the specified specifications), the disc drive apparatus 1 has the spherical aberration correction value CH and the focus bias value FB. As described above, the first to fifth operations are designed to be successful by the spherical aberration correction initial value and the focus bias initial value.

  However, if a medium outside the format standard is inserted, or if the disk drive device 1 is used in a harsh environment, the optimal values of the spherical aberration correction value CH and the focus bias value FB, and the spherical aberration correction initial stage are used. There is a possibility that the value and the focus bias initial value are largely separated from each other and the operation fails in any of the first to fifth stages described above.

  In such a case, the disk drive device 1 of the present invention performs the following operation. Specifically, when the focus servo ON operation fails in the second stage described above, the disk drive device 1 microcomputer 6 determines that the spherical aberration correction initial value and the focus bias initial value in the first layer (L0 layer) This is considered to be far from the optimum value for the on operation.

  At this time, as shown in FIG. 3, the adjustment value calculation unit 10 of the microcomputer 6 has a spherical surface on a two-dimensional plane when the spherical aberration correction shift amount ± α is the horizontal axis and the focus bias shift amount ± β is the vertical axis. The initial value of aberration correction and the initial value of focus bias are regarded as the origin of the two-dimensional plane, and the retry start position (spherical aberration shift amount, focus bias shift amount) on the two-dimensional plane shifted by a certain amount from the origin is sequentially 8 locations The optimum spherical aberration correction value CH and focus bias value FB are searched for while moving.

  That is, the adjustment value calculator 10 first sets the spherical aberration correction value CH to “spherical aberration correction initial value + α0” in the first layer (L0 layer), and sets the focus bias value FB to “focus bias in the first layer (L0 layer)”. At the retry start position (spherical aberration correction initial value + α0, focus bias initial value) on the two-dimensional plane defined as “initial value”, the focus servo ON operation in the second stage is retried again.

  If the focus servo ON operation still fails, the adjustment value calculation unit 10 of the disk drive device 1 sets the spherical aberration correction value CH to “spherical aberration correction initial value + α0” in the first layer (L0 layer), and the focus bias value FB. The focus servo is turned on again in the second stage at the retry start position (spherical aberration correction initial value + α0, focus bias initial value + β0) on the two-dimensional plane with “focus bias initial value + β0” in the first layer (L0 layer). Retry the operation.

  Incidentally, “0” of α0 and β0 in “spherical aberration correction initial value + α0” and “focus bias initial value + β0” means that it is the first layer (L0 layer).

  As described above, the microcomputer 6 of the disk drive device 1 changes the addition value (or subtraction value) of the spherical aberration correction value CH and the focus bias value FB each time it retries, and counterclockwise (arrow direction) around the origin. All 8 retries are made while moving to.

  The microcomputer 6 of the disk drive device 1 does not only retry 8 times while moving counterclockwise (arrow direction) around the origin, but also retry 8 times while moving clockwise around the origin. In other words, the focus servo can be turned on in a short time by determining the moving direction according to some tendency based on past data.

  When the focus servo is turned on in the second stage, the retry start position (spherical surface) on the two-dimensional plane with the spherical aberration correction value CH set to “spherical aberration correction initial value + α0” and the focus bias value FB set to “focus bias initial value + β0”. If the aberration correction initial value + α0 and the focus bias initial value + β0) are successful, the disk drive device 1 proceeds to the next third-stage sequence in that state.

  As a third stage, the disk drive apparatus 1 has a retry start position (spherical surface) on a two-dimensional plane in which the spherical aberration correction value CH is “spherical aberration correction initial value + α0” and the focus bias value FB is “focus bias initial value + β0”. The disc information is read with the aberration correction initial value + α0 and the focus bias initial value + β0). At this time, if the disk drive apparatus 1 fails to read the disk information, the retry start position is regarded as the origin in FIG. 3, and the spherical aberration correction shift amount ± α and the focus bias shift amount ± β from the position are used as described above. As shown in FIG. 4, the spherical aberration optimum adjustment process and the focus bias optimum adjustment process in the third stage are performed and the disc information is read by performing retrying eight times while moving counterclockwise (arrow direction) around the origin. .

  Further, when the focus jump in the fourth stage or the disk reading in the fifth stage fails, the disk drive device 1 determines that the spherical aberration correction initial value and the focus bias initial value in the second layer (L1 layer) are the focus jump and the disk reading. This is because the spherical aberration correction value CH is set to “spherical aberration correction initial value + α1” in the second layer (L1 layer) and the focus bias value FB. The focus servo in the second stage is retried again at the retry start position (spherical aberration correction initial value + α1, focus bias initial value) on the two-dimensional plane with the “focus bias initial value” in the second layer (L1 layer). When the operation is turned on, each failed process is retried thereafter.

  As described above, the disk drive apparatus 1 uses the spherical aberration shift amount ± α1 and the focus bias shift amount ± β1 for the second layer (L1 layer) as well as the first layer (L0 layer), and the spherical aberration correction value CH and The addition value (or subtraction value) of the focus bias value FB is changed, and the operation is retried eight times while moving counterclockwise (arrow direction) around the origin.

  If the disc reading fails in the fifth stage after the focus jump in the fourth stage is successful, the disk drive apparatus 1 sets the spherical aberration correction value CH and the focus servo value FB when the focus jump is successful in the two-dimensional plane. Retrying again as described above.

  As described above, the disk drive device 1 is a two-dimensional plane even in the worst usage environment that can be assumed at present, including the case where a medium outside the format standard is inserted, or the temporal change of the optical pickup 3 and the temperature characteristics. Spherical aberration shift amount ± α0, ± α1 and focus bias shift amount ± β0, ± β1 that are expected to be successfully focused somewhere in the total of 8 retries centered on the origin at the same fixed value for each layer Is set in advance in the non-volatile memory 11 so that the spherical aberration correction value CH and the focus bias at each stage of processing such as when the focus servo is turned on, when reading the wobbling groove, when reading the reproduction RF signal, etc. The optimum value of the value FB is found and the recording / reproducing operation with respect to the optical disc 2 can be executed accurately.

(3) Optimal value search processing procedure for spherical aberration correction value and focus bias value Next, the disk drive device 1 follows the spherical aberration correction and focus bias correction control program which is an application program, and the spherical aberration correction value CH and focus at each stage. The optimum value search processing procedure for finding and setting the optimum value of the bias value FB will be specifically described with reference to the flowchart of FIG.

  In practice, the microcomputer 6 of the disk drive device 1 enters from the start step of the routine RT1 and proceeds to step SP1, where the sequence monitoring unit 9 determines whether or not the focus servo on operation of the optical disk 2 by the optical pickup 3 has succeeded. To do.

  If a negative result is obtained here, this indicates that the focus servo on operation has failed for the inserted optical disk 2, and the microcomputer 6 proceeds to the next step SP2.

  In step SP2, the microcomputer 6 changes the addition value (or subtraction value) of the spherical aberration correction value CH and the focus bias value FB by the adjustment value calculation unit 10, and counterclockwise around the origin in the two-dimensional plane (FIG. 3). An optimum value search process for finding the optimum values of the spherical aberration correction value CH and the focus bias value FB when the focus servo is turned on is performed by retrying all eight times while moving in the turning direction (arrow direction), and again at step SP1. Return to.

  On the other hand, if an affirmative result is obtained in step SP1, this indicates that the focus servo on operation of the optical pickup 3 with respect to the optical disc 2 has succeeded, and the microcomputer 6 proceeds to the next step SP3.

  In step SP3, the microcomputer 6 determines whether or not the sequence monitoring unit 9 has read the wobbling groove of the optical disk 2 by the optical pickup 3. If a negative result is obtained, the microcomputer 6 proceeds to the next step SP4.

  In step SP4, the microcomputer 6 changes the addition value (or subtraction value) of the spherical aberration correction value CH and the focus bias value FB by the adjustment value calculation unit 10, and counterclockwise around the origin in the two-dimensional plane (FIG. 3). An optimum value search process for finding the optimum values of the spherical aberration correction value CH and the focus bias value FB at the time of reading the wobbling groove is performed by moving all the way in the rotation direction (arrow direction) and retrying eight times, and the process returns to step SP3. Return.

  On the other hand, if a positive result is obtained in step SP3, this indicates that the reading of the wobbling groove has succeeded following the ON operation of the focus servo. At this time, the microcomputer 6 performs the next step. Move to SP5.

  In step SP5, the microcomputer 6 determines whether or not the sequence monitoring unit 9 has successfully read out the reproduction RF signal from the optical disc 2 by the optical pickup 3, and if a negative result is obtained, the microcomputer 6 proceeds to the next step SP6.

  In step SP6, the microcomputer 6 changes the addition value (or subtraction value) of the spherical aberration correction value CH and the focus bias value FB by the adjustment value calculation unit 10, and counterclockwise around the origin in the two-dimensional plane (FIG. 3). An optimum value search process for finding the optimum values of the spherical aberration correction value CH and the focus bias value FB at the time of reading the reproduction RF signal is performed by retrying all eight times while moving in the rotation direction (arrow direction), and step SP5 is performed again. Return to.

  On the other hand, if an affirmative result is obtained in step SP5, this indicates that the focus servo ON operation, the wobbling groove reading, and the reproduction RF signal reading are all successful. At this time, the microcomputer 6 Moves to the next step SP7.

  In step SP7, the microcomputer 6 is in a state in which the laser beam is focused on the signal recording surface of the optical disc 2 by the optical pickup 3. Therefore, the microcomputer 6 reproduces or records data, and proceeds to the next step SP8 to perform processing. finish.

(4) Operation and Effect In the above configuration, the microcomputer 6 of the disk drive apparatus 1 performs the processing at each stage of processing such as when the focus servo is turned on, when reading the wobbling groove, when reading the reproduction RF signal, etc. Even when the spherical aberration correction shift amount ± α is the horizontal axis and the focus bias shift amount ± β is the vertical axis, the spherical aberration correction initial value and the focus bias initial value are Considering the origin of the two-dimensional plane, the optimal spherical aberration correction value CH and the retry start position (spherical aberration correction value CH, focus bias value FB) on the two-dimensional plane shifted by a certain amount from the origin are sequentially moved at eight locations. The focus bias value FB can be found.

  For this reason, in the disk drive device 1, the spherical aberration correction initial value and the focus are set in the worst use environment that can be assumed at the present time, including the case where a medium outside the format standard is inserted, or the temporal change and temperature characteristics of the optical pickup 3. Even when the bias initial value and the optimum values of the actual spherical aberration correction value CH and the focus bias value FB are greatly deviated, the focus servo is turned on, the wobbling groove is read, and the reproduction RF signal is read and data. Recording can be performed accurately.

  When the microcomputer 6 of the disk drive apparatus 1 performs a focus jump with respect to the optical disk 2 having a double layer structure, the spherical aberration correction initial value and the focus bias initial value, and the actual spherical aberration correction value CH and the focus bias value. Even when there is a large deviation from the optimum value of FB, the two-dimensional plane in which the spherical aberration correction initial value and the focus bias initial value are shifted from the origin by a certain amount on the two-dimensional plane. It is possible to find the optimum spherical aberration correction value CH and focus bias value FB even in the focus jump destination layer by retrying while moving the upper retry start position (spherical aberration correction value CH, focus bias value FB) sequentially in eight places. it can.

  The microcomputer 6 of the disk drive apparatus 1 uses only the spherical aberration shift amount ± α on the two-dimensional plane, and does not use the focus bias shift amount ± β (the spherical aberration correction value CH, the focus bias value FB). ), Or vice versa, the retry start position (spherical aberration correction value CH, focus bias value FB) is set using only the focus bias shift amount ± β without using the spherical aberration shift amount ± α in the two-dimensional plane. The retry start position (spherical aberration correction value CH, focus bias value FB) can be set using both the spherical aberration shift amount ± α and the focus bias shift amount ± β on the two-dimensional plane. Therefore, while considering the mutual influence between the spherical aberration correction value CH and the focus bias value FB You can find the optimal spherical aberration correction value CH and focus bias value FB.

  Further, the microcomputer 6 of the disk drive apparatus 1 is optimal while sequentially moving the retry start position (spherical aberration correction value CH, focus bias value FB) on the two-dimensional plane shifted by a certain amount from the origin on the two-dimensional plane. Since the spherical aberration correction value CH and the focus bias value FB can be found out, it is possible to relax the specifications of the optical characteristics required for the optical pickup 3 itself and reduce the manufacturing cost.

  According to the above configuration, the spherical aberration correction initial value, the focus bias initial value, and the actual value are obtained in a usage environment that takes into account the time-dependent change and temperature characteristics of the optical pickup 3 when a non-format standard medium is inserted. Even when the spherical aberration correction value CH and the optimum value of the focus bias value FB deviate significantly, the focus servo ON operation, wobbling groove reading, reproduction RF signal reading and data recording are accurately executed. can do.

(5) Other Embodiments In the above-described embodiments, all eight types of retry start positions are set while moving in the counterclockwise direction (arrow direction) about the origin on the two-dimensional plane. However, the present invention is not limited to this. For example, as shown in FIG. 5, the retry start position (spherical aberration correction value CH, focus bias value FB) on the two-dimensional plane is (α00, β00) → ( α01, β01) → (α02, β02) → (α03, β03) → (α04, β04) → (α05, β05) → (α06, β06) → (α07, β07) → (α08, β08), and so on. In addition, a plurality of arbitrary retry start positions that match the optical characteristics of the optical pickup 3 may be set in the clockwise direction or the counterclockwise direction from the origin. In this case, the optimum spherical aberration correction value CH and focus bias value FB can be found in a shorter time.

  In the above embodiment, the spherical aberration shift amounts ± α0 and ± α1 and the focus bias shift amounts ± β0 and ± β1 are set as fixed values in the nonvolatile memory 11 in advance. The present invention is not limited to this, and the individual spherical aberration shift amount ± α and the focus bias shift amount ± β are found for each disk drive device 1 and stored individually in the nonvolatile memory 11 and are optimally used. The spherical aberration correction value CH and the focus bias value FB may be searched for.

  In the above-described embodiment, the case where eight types of retry times are set based on the spherical aberration shift amount ± α and the focus bias shift amount ± β set as fixed values in advance has been described. Not limited to this, the spherical aberration shift amount ± α and the focus bias shift amount ± β are changed at a certain timing during the retry, the retry frequency is arbitrarily changed, and the spherical aberration shift amount ± α and the focus bias are changed. The setting of the shift amount ± β and the number of retries may be changed individually for each layer.

  Furthermore, in the above-described embodiment, the case where the present invention is applied to the disk drive device 1 has been described. However, the present invention is not limited to this, and other personal computers such as a personal computer on which the disk drive device 1 is mounted. The present invention may be applied to various electronic devices.

  Further, in the above-described embodiment, the microcomputer 6 as the optical pickup control device according to the present invention includes the spherical aberration correction value setting unit 13 as the spherical aberration correction means, the DA converter 16, the driver circuit 17, and the focus bias. A case will be described where the focus bias setting unit 8, servo filter processing unit 12, DA converter 14 and driver circuit 15 as adjustment means, and the sequence monitoring unit 9 and adjustment value calculation unit 10 as control means are configured. However, the present invention is not limited to this, and the control device for the optical pickup may be configured with various other circuit configurations.

  The optical pickup control device, the optical pickup control method, and the disk drive device according to the present invention may cause a read error when, for example, a medium outside the format standard is inserted or when the optical pickup changes with time. Even in such a case, the present invention can be applied to a use for enabling data recording or reading.

1 is a schematic block diagram showing a circuit configuration of a disk drive device according to the present invention. It is a basic diagram which shows the structure of an optical pick-up. It is an approximate line figure used for explanation of how to move shift amount. It is a flowchart which shows the optimal value search processing procedure of a spherical aberration correction value and a focus bias value. It is a basic diagram with which it uses for description of how to move the shift amount in other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Disk drive apparatus, 2 ... Optical disk, 3 ... Optical pick-up, 4 ... Servo error signal generation circuit, 6 ... Microcomputer, 8 ... Focus bias setting part, 9 ... Sequence monitoring part, 10 ... ... Adjustment value calculation unit 11... Nonvolatile memory 12. Servo filter processing unit 13. Spherical aberration correction value processing unit 23. Expander 24.

Claims (3)

A control device for a disk drive device for recording or reproducing data on an optical disk via an optical pickup,
Spherical aberration correction means for correcting spherical aberration for the optical disk based on a spherical aberration correction value;
A focus bias adjusting means for adjusting a focus servo for the optical disc based on a focus bias value;
When reading of the wobbling groove following the focus servo ON operation as the first processing for the recording layer of the optical disk inserted in the disk drive device fails, the shift amount of the spherical aberration correction value with respect to the recording layer is changed to a spherical surface. In a two-dimensional plane having an aberration shift amount ± α and the focus bias value shift amount being a focus bias shift amount ± β, the predetermined spherical aberration correction initial value and focus bias initial value are regarded as the origin of the two-dimensional plane, The spherical aberration considered to be most suitable as the first process by retrying the first process while sequentially moving the retry start position shifted from the origin by a certain amount around the origin in a predetermined order. First trial means for searching for a correction value and the focus bias value;
When the first process is successful due to the spherical aberration correction value and the focus bias value, which are considered to be most suitable as the first process , the reproduction signal is read from the optical disk as the second process. If the negative result is obtained, the spherical aberration correction value and the focus bias value when the first process is successful are re-acquired as the origin of the two-dimensional plane. by retrying the second th processing the retry start position a certain amount shifted from the origin as the center the origin while sequentially moving in said queue, the spherical aberration that would be the most suitable as the second th processing An optical pickup control device comprising: a second trial means for searching for a correction value and the focus bias value. A control method of a disk drive device for recording or reproducing data on an optical disk via an optical pickup,
When reading of the wobbling groove following the focus servo ON operation as the first processing for the recording layer of the optical disk inserted in the disk drive device fails, the shift amount of the spherical aberration correction value with respect to the recording layer is changed to a spherical surface. In a two-dimensional plane having an aberration shift amount ± α and the focus bias value shift amount being a focus bias shift amount ± β, the predetermined spherical aberration correction initial value and focus bias initial value are regarded as the origin of the two-dimensional plane, It seems to be most suitable as the first process by the first trial means for retrying the first process while sequentially moving the retry start position shifted from the origin by a certain amount around the origin in a predetermined order. A first search for the spherical aberration correction value and the focus bias value And line step,
When the first process is successful due to the spherical aberration correction value and the focus bias value, which are considered to be most suitable as the first process , the reproduction signal is read from the optical disk as the second process. If the negative result is obtained, the spherical aberration correction value and the focus bias value when the first process is successful are re-acquired as the origin of the two-dimensional plane. the retry start position a certain amount shifted from the origin as the center the origin by a second attempt means for retrying the sequence moves while the first second processing in the order, are considered to be the most suitable as the second th processing And a second trial step for searching for the spherical aberration correction value and the focus bias value. . A disk drive device for recording or reproducing data on an optical disk via an optical pickup,
Reading out the wobbling groove following the focus servo ON operation as the predetermined first process or the reproduction signal from the optical disk as the predetermined second process for the recording layer of the optical disk inserted into the disk drive device Processing means for executing reading of
Spherical aberration correction means for correcting spherical aberration for the optical disk based on a spherical aberration correction value;
A focus bias adjusting means for adjusting a focus servo for the optical disc based on a focus bias value;
When the first-th processing for recording layer of the inserted the optical disk in the disk drive has failed, the shift amount of the spherical aberration correction value and the spherical aberration shift amount ± alpha with respect to the recording layer, the focus bias value In a two-dimensional plane in which the shift amount is the focus bias shift amount ± β, the predetermined spherical aberration correction initial value and the focus bias initial value are regarded as the origin of the two-dimensional plane, and are shifted from the origin by a certain amount around the origin. The first processing is retried while sequentially moving the retry start position in a predetermined order, thereby searching for the spherical aberration correction value and the focus bias value that are considered to be most suitable as the first processing. One trial means,
When the above spherical aberration correction value and the focus bias value to be considered to be the most suitable as the first th processing the 1st process has succeeded, it is judged whether or not the next of said second th processing If a negative result is obtained, the spherical aberration correction value and the focus bias value when the first process is successful are re-acquired as the origin of the two-dimensional plane, and the origin is set as the center and the origin is set as the center. The second processing is retried while sequentially moving the retry start position shifted by a certain amount in the order described above, thereby searching for the spherical aberration correction value and the focus bias value that are most suitable for the second processing. A disk drive device comprising: a second trial means for:

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