JP2004095106A - Disk drive device, and adjusting method for focus bias and spherical aberration - Google Patents

Disk drive device, and adjusting method for focus bias and spherical aberration Download PDF

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Publication number
JP2004095106A
JP2004095106A JP2002257584A JP2002257584A JP2004095106A JP 2004095106 A JP2004095106 A JP 2004095106A JP 2002257584 A JP2002257584 A JP 2002257584A JP 2002257584 A JP2002257584 A JP 2002257584A JP 2004095106 A JP2004095106 A JP 2004095106A
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Japan
Prior art keywords
value
spherical aberration
aberration correction
focus bias
error signal
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JP2002257584A
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JP4154962B2 (en
Inventor
Masaomi Nabeta
鍋田 将臣
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Sony Corp
ソニー株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To realize an adequate focal bias and spherical aberration adjusting method. <P>SOLUTION: It is made possible to appropriately perform necessary adjusting operation, and recording and reproducing operation, by setting an optimal focus bias value and an optimal spherical aberration correction value by observing and detecting the amplitude of a tracking error signal, in a disk driving device incapable of ensuring all the other adjustments, for example, laser power, detailed spherical aberration correction using an RF signal, focus bias correction, or the like. As for the adjusting procedures, a focus bias is set to a predetermined value, and a tracking error signal is observed while varying a spherical aberration correction value, to detect and set the optimal spherical aberration correction value, and thereafter the tracking error is observed while varying the focus bias value, to detect the optimal focus bias value, and by this operation, the optimal values of the focus bias and the spherical aberration correction are detected and set. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disk drive device for a disk recording medium such as an optical disk, and a focus bias and spherical aberration adjustment method.
[0002]
[Prior art]
As a technique for recording and reproducing digital data, for example, an optical disk (including a magneto-optical disk) such as a CD (Compact Disk), an MD (Mini-Disk), and a DVD (Digital Versatile Disk) is used as a recording medium. There is data recording technology. An optical disk is a general term for a recording medium that irradiates a laser beam onto a disk in which a thin metal plate is protected by plastic and reads a signal based on a change in reflected light.
Optical disks include, for example, a read-only type known as a CD, a CD-ROM, and a DVD-ROM, and an MD, a CD-R, a CD-RW, a DVD-R, a DVD-RW, a DVD + RW, and a DVD. -There is a type in which user data can be recorded as is known in RAM and the like. In the recordable type, data can be recorded by using a magneto-optical recording method, a phase change recording method, a dye film change recording method, or the like. The dye film change recording method is also called a write-once recording method, which is suitable for data storage and the like because data can be recorded only once and cannot be rewritten. On the other hand, the magneto-optical recording method and the phase change recording method are rewritable, and are used for various purposes including recording of various content data such as music, video, games, and application programs.
Further, in recent years, a high-density optical disc called DVR (Data & Video Recording) has been developed, and a remarkable increase in capacity has been achieved.
[0003]
For a high-density disc such as a DVR, in a disc structure having a cover layer of 0.1 mm in the disc thickness direction, a laser having a wavelength of 405 nm (a so-called blue laser) and an objective lens having an NA of 0.85 are combined. Assuming that a phase change mark (phase change mark) is to be recorded / reproduced, a data block of 64 KB (kilobytes) having a track pitch of 0.32 μm and a linear density of 0.12 μm / bit is used as one recording / reproduction unit, and the format efficiency is about 82% In this case, a capacity of about 23.3 GB (gigabyte) can be recorded / reproduced on a direct 12 cm disk.
If the linear density is set to 0.112 μm / bit in the same format, a capacity of 25 GB can be recorded and reproduced.
Further, by making the recording layer have a multilayer structure, a drastic increase in capacity can be realized. For example, by using two recording layers, the capacity can be increased to 46.6 GB or 50 GB, which is twice the above.
[0004]
[Problems to be solved by the invention]
By the way, as is already known, in a disk drive device that performs recording and reproduction on an optical disk, a focus servo operation for controlling a focal position of a laser beam on a disk recording surface, or a laser beam is applied to a track (pit row or groove) on the disk A tracking servo operation for controlling to trace a track is performed.
Regarding the focus servo, it is known that it is necessary to apply an appropriate focus bias to a focus loop for proper servo operation.
[0005]
In particular, in the case of a high-density disc such as the above-mentioned DVR, it is necessary to correct spherical aberration in order to cope with a thickness error of a cover layer and a recording layer having a multilayer structure. A device having a spherical aberration correction mechanism using a liquid crystal element has been developed.
[0006]
Conventionally, there has been a technique for setting a focus bias using an RF signal or a tracking error signal in a disk drive device, but a method of adjusting a focus bias and a spherical aberration correction value in a system having a spherical aberration correction mechanism is known. Not.
In an optical disc recording / reproducing apparatus employing a high numerical aperture and blue laser, it is guaranteed that the RF signal can be recorded / reproduced when the focus bias and the spherical aberration correction value are not adjusted, or at a predetermined constant value determined by design. There is no.
Therefore, before the focus bias adjustment and the spherical aberration correction value adjustment using the RF signal, it is necessary to first make the RF signal recordable and reproducible.
[0007]
[Means for Solving the Problems]
Therefore, the present invention adjusts the focus bias and the spherical aberration correction value so that the tracking error signal amplitude is optimized in a state where the focus servo is turned on and the tracking servo is turned off when a disc is inserted or during recording / reproduction of the disc. Accordingly, it is an object to obtain a focus bias and a spherical aberration correction value having recording / reproducing characteristics sufficient for at least various adjustments using an RF signal.
[0008]
For this purpose, the disk drive device of the present invention performs laser irradiation and reflected light detection on a disk recording medium for writing or reading data, and also performs a focus servo mechanism for laser light, a tracking servo mechanism, and spherical aberration correction. A head means having a mechanism, an error signal generating means for generating a focus error signal and a tracking error signal from reflected light obtained by the head means, and a focus servo drive signal generated based on the focus error signal; Focus servo means for driving a mechanism to execute focus servo; tracking servo means for generating a tracking servo drive signal based on the tracking error signal and driving the tracking servo mechanism to execute tracking servo; and spherical aberration A spherical aberration correction unit that generates a spherical aberration correction drive signal based on the positive value and drives the spherical aberration correction mechanism to perform spherical aberration correction; and a focus that adds a focus bias to a focus loop including the focus servo unit. A bias means for detecting an optimum value of the focus bias and an optimum value of the spherical aberration correction value while observing the tracking error signal, and a focus bias value to be added by the focus bias means; And adjustment means for setting the spherical aberration correction values in (1) and (2) to optimal values, respectively.
[0009]
More specifically, the adjusting means sets the focus bias to be added by the focus bias means to a predetermined value, and observes the tracking error signal while changing the spherical aberration correction value. After detecting the optimal spherical aberration correction value based on the amplitude of the error signal, setting the optimal spherical aberration correction value to the spherical aberration correction means, observing the tracking error signal while changing the focus bias value, An optimum focus bias value is detected based on the amplitude of the observed tracking error signal, and a focus bias added by the focus bias unit is set to the optimum focus bias value.
Alternatively, the adjusting means sets the spherical aberration correction value in the spherical aberration correcting means to a predetermined value, observes the tracking error signal while changing the focus bias value, and based on the amplitude of the observed tracking error signal. After detecting the optimum focus bias value, setting the optimum focus bias value to the focus bias means, observing the tracking error signal while changing the spherical aberration correction value, and adjusting the amplitude of the observed tracking error signal. An optimum spherical aberration correction value is detected based on the spherical aberration correction value, and the spherical aberration correction value in the spherical aberration correction means is set to the optimum spherical aberration correction value.
[0010]
In addition, a storage unit is provided, and the adjustment unit stores the detected optimum value of the focus bias and the optimum value of the spherical aberration correction value in the storage unit.
When the storage means is provided, the adjusting means observes the tracking error signal while changing the spherical aberration correction value, and detects an optimal spherical aberration correction value based on the amplitude of the observed tracking error signal. In (2), the focus bias value added by the focus bias means is set to a value stored in the storage means.
When the storage means is provided, the adjusting means observes the tracking error signal while changing the focus bias value, and detects an optimum focus bias value based on the amplitude of the observed tracking error signal. The spherical aberration correction value in the spherical aberration correction means is set to a value stored in the storage means.
[0011]
The adjusting means sets a focus bias to be added by the focus bias means, observes the tracking error signal while changing the spherical aberration correction value, and sets an appropriate spherical surface based on the amplitude of the observed tracking error signal. Processing for detecting an aberration correction value, setting the spherical aberration correction value in the spherical aberration correction means, observing the tracking error signal while changing the focus bias value, and based on the amplitude of the observed tracking error signal. The process of detecting an appropriate focus bias value is alternately and repeatedly performed to detect an optimum focus bias value and a spherical aberration correction value.
[0012]
If the detected optimum value of the focus bias or the detected optimum value of the spherical aberration correction value does not fall within the predetermined range, the adjusting unit sets the detection result as an error.
The adjustment means stores the optimum value of the detected focus bias and the optimum value of the spherical aberration correction value in the storage means, and stores the optimum value of the detected focus bias or the detected spherical aberration correction value. If the detection result of the optimum value of the value is an error, the value stored in the storage unit is applied as the optimum value of the focus bias or the optimum value of the spherical aberration correction value.
[0013]
As a specific optimum value detecting operation by the adjusting means, the focus bias value or the spherical aberration correction value is changed from a predetermined value at three equal intervals, and the amplitude of the tracking error signal in each case is changed. The optimum value of the focus bias or the optimum value of the spherical aberration correction value is detected by an arithmetic process of measuring and performing quadratic curve approximation using the three measurement results.
Alternatively, the adjusting means changes the focus bias value or the spherical aberration correction value from a predetermined value to three or more types at regular intervals, and measures the amplitude of the tracking error signal in each case. The optimum value of the focus bias or the optimum value of the spherical aberration correction value is detected by an arithmetic process of performing quadratic curve approximation using three measurement results selected based on the above.
Alternatively, the adjusting means measures the amplitude of the tracking error signal while changing the focus bias value or the spherical aberration correction value from a predetermined value, and determines the value at which the amplitude of the tracking error signal is optimal, by using the focus bias value. Or the optimum value of the spherical aberration correction value.
[0014]
The focus bias and spherical aberration adjustment method of the present invention performs laser irradiation and reflected light detection on a disk recording medium for writing or reading data, and also performs a focus servo mechanism for laser light, a tracking servo mechanism, and spherical aberration. As a method of adjusting a focus bias and spherical aberration in a disk drive device having a correction mechanism, a focus servo loop is turned on while a tracking servo signal is turned off and a tracking error signal generated from the reflected light is observed while a tracking servo is turned off. The optimum value of the focus bias to be added and the optimum value of the spherical aberration correction value were detected, and the focus bias value to be added to the focus servo loop and the spherical aberration correction value for driving the spherical aberration correction mechanism were detected. Set to the optimal value.
[0015]
More specifically, the focus bias is set to a predetermined value, the tracking error signal is observed while changing the spherical aberration correction value, and the optimum spherical aberration correction value is determined based on the amplitude of the observed tracking error signal. After detecting the tracking error signal, the optimum spherical aberration correction value is set, the tracking error signal is observed while changing the focus bias value, and the optimum focus bias value is detected based on the amplitude of the observed tracking error signal. And setting the focus bias to the optimum focus bias value.
Alternatively, after setting the spherical aberration correction value to a predetermined value, observing the tracking error signal while changing the focus bias value, and detecting an optimal focus bias value based on the amplitude of the observed tracking error signal. Setting the optimal focus bias value, observing the tracking error signal while changing the spherical aberration correction value, detecting the optimal spherical aberration correction value based on the amplitude of the observed tracking error signal, The aberration correction value is set to the above-described optimum spherical aberration correction value.
[0016]
Further, the optimum value of the detected focus bias and the optimum value of the spherical aberration correction value are stored in the storage unit.
In this case, the tracking error signal is observed while changing the spherical aberration correction value, and when the optimal spherical aberration correction value is detected based on the amplitude of the observed tracking error signal, the focus bias value is set to Set to the value stored in the storage means.
Further, when the tracking error signal is observed while changing the focus bias value, and when the optimum focus bias value is detected based on the amplitude of the observed tracking error signal, the spherical aberration correction value is stored in the storage means. Set to the value stored in.
[0017]
Setting the focus bias, observing the tracking error signal while changing the spherical aberration correction value, and detecting an appropriate spherical aberration correction value based on the amplitude of the observed tracking error signal; The process of setting the aberration correction value, observing the tracking error signal while changing the focus bias value, and detecting an appropriate focus bias value based on the amplitude of the observed tracking error signal is alternately and repeatedly performed. Then, the optimum focus bias value and spherical aberration correction value are detected.
[0018]
If the detected optimum value of the focus bias or the detected optimum value of the spherical aberration correction value does not fall within the predetermined range, the detection result is regarded as an error.
In addition, the optimum value of the detected focus bias and the optimum value of the spherical aberration correction value are stored in the storage unit, and the detection result of the detected optimum value of the focus bias or the detected optimum value of the spherical aberration correction value is regarded as an error. In this case, the value stored in the storage unit is applied as the optimum value of the focus bias or the optimum value of the spherical aberration correction value.
[0019]
As a specific detection process of the optimum value, the focus bias value or the spherical aberration correction value is changed from a predetermined value at three equal intervals, and the amplitude of the tracking error signal in each case is measured. The optimum value of the focus bias or the optimum value of the spherical aberration correction value is detected by an arithmetic process of performing quadratic curve approximation using the two measurement results.
Alternatively, the focus bias value or the spherical aberration correction value is changed from a predetermined value to three or more types at regular intervals, and the amplitude of the tracking error signal in each case is measured, and is selected based on each measurement result. The optimum value of the focus bias or the optimum value of the spherical aberration correction value is detected by an arithmetic process of performing quadratic curve approximation using the three measurement results.
Or, the focus bias value, or the spherical aberration correction value, the amplitude of the tracking error signal is measured while changing from a predetermined value, the value at which the amplitude of the tracking error signal is optimal, the optimal value of the focus bias, or The spherical aberration correction value is detected as an optimum value.
[0020]
According to the present invention having the above-described configuration, an operation of finding an optimum focus bias value and an optimum spherical aberration correction value using the amplitude of the tracking error signal is executed, and the RF signal can be recorded and reproduced. Can be.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, as an embodiment of the present invention, a disk drive device (recording / reproducing device) for performing recording / reproducing corresponding to an optical disk and a method of adjusting a focus bias and spherical aberration thereof will be described. The description will be made in the following order.
1. Configuration of disk drive unit
2. Spherical aberration correction mechanism
3. Configuration of servo system
4. Example of adjustment processing [1]
4-1 Adjustment processing
4-2 Detection operation by three-point measurement method
4-3 Detection operation by extended three-point measurement method
4-4 Detection operation by optimal value detection method
5. Adjustment processing example [2]
6. Adjustment processing example [3]
7. Adjustment processing example [4]
8. Adjustment processing example [5]
9. Adjustment timing
10. Modified example
[0022]
1. Configuration of disk drive unit
FIG. 1 shows the configuration of the disk drive device of the present embodiment.
It is assumed that the disk 1 is an optical disk on which data is recorded by a phase change method, for example. A wobbled groove is formed on the disk, and this groove is used as a recording track. Depending on the wobbling of the groove, address information and the like are embedded as so-called ADIP information.
[0023]
Such a disk 1 is mounted on a turntable (not shown), and is rotated at a constant linear velocity (CLV) by a spindle motor 52 during a recording / reproducing operation.
Then, ADIP information embedded as wobbling of a groove track on the disk 1 is read by an optical pickup (optical head) 51.
At the time of recording, user data is recorded as a phase change mark on a track by the optical pickup 51, and at the time of reproduction, the phase change mark recorded by the optical pickup is read.
[0024]
In the pickup 51, a laser diode serving as a laser light source, a photodetector for detecting reflected light, an objective lens serving as an output end of the laser light, and a laser beam are radiated to the disk recording surface via the objective lens. An optical system (not shown) for guiding the reflected light to the photodetector is formed.
The laser diode outputs, for example, a so-called blue laser having a wavelength of 405 nm. The NA of the optical system is 0.85.
[0025]
In the pickup 51, the objective lens is held movably in the tracking direction and the focus direction by a biaxial mechanism.
Further, the entire pickup 51 can be moved in the disk radial direction by a thread mechanism 53.
The laser diode in the pickup 51 is driven to emit laser light by a drive signal (drive current) from a laser driver 63.
[0026]
As will be described later, a mechanism for correcting the spherical aberration of the laser beam is provided in the pickup 51, and the spherical aberration is corrected under the control of the system controller 60 and the servo circuit 62.
[0027]
The reflected light information from the disk 1 is detected by a photodetector, and is supplied to the matrix circuit 54 as an electric signal corresponding to the amount of received light.
The matrix circuit 54 includes a current-voltage conversion circuit, a matrix operation / amplification circuit, and the like corresponding to output currents from a plurality of light receiving elements as photodetectors, and generates a necessary signal by matrix operation processing.
For example, a high-frequency signal (reproduced data signal) corresponding to reproduced data, a focus error signal for servo control, a tracking error signal, and the like are generated.
Further, a push-pull signal is generated as a signal related to groove wobbling, that is, a signal for detecting wobbling.
[0028]
The reproduced data signal output from the matrix circuit 54 is supplied to the reader / writer circuit 55, the focus error signal and the tracking error signal are supplied to the servo circuit 61, and the push-pull signal is supplied to the wobble circuit 58.
[0029]
The reader / writer circuit 55 performs a binarization process, a reproduction clock generation process by a PLL, and the like on the reproduction data signal, reproduces the data read as the phase change mark, and supplies the data to the modulation / demodulation circuit 56.
The modulation / demodulation circuit 56 has a functional part as a decoder at the time of reproduction and a functional part as an encoder at the time of recording.
At the time of reproduction, as a decoding process, a demodulation process of a run-length limited code is performed based on a reproduction clock.
The ECC encoder / decoder 57 performs an ECC encoding process for adding an error correction code during recording and an ECC decoding process for performing error correction during reproduction.
At the time of reproduction, the data demodulated by the modulation / demodulation circuit 56 is taken into an internal memory, and error detection / correction processing and processing such as deinterleaving are performed to obtain reproduction data.
The data decoded to the reproduction data by the ECC encoder / decoder 57 is read out based on an instruction from the system controller 60 and transferred to an AV (Audio-Visual) system 120.
[0030]
The push-pull signal output from the matrix circuit 54 as a signal related to groove wobbling is processed in the wobble circuit 58. The push-pull signal as the ADIP information is demodulated by the wobble circuit 58 into a data stream forming the ADIP address and supplied to the address decoder 59.
The address decoder 59 decodes the supplied data, obtains an address value, and supplies it to the system controller 10.
The address decoder 9 generates a clock by a PLL process using a wobble signal supplied from the wobble circuit 8 and supplies the generated clock to, for example, an encoding clock at the time of recording.
[0031]
At the time of recording, recording data is transferred from the AV system 120, and the recording data is sent to a memory in the ECC encoder / decoder 57 and buffered.
In this case, the ECC encoder / decoder 57 adds an error correction code, adds an interleave, a subcode, and the like as an encoding process of the buffered recording data.
The ECC-encoded data is subjected to RLL (1-7) PP modulation in a modulation / demodulation circuit 56 and supplied to a reader / writer circuit 55.
As described above, the clock generated from the wobble signal is used as an encode clock serving as a reference clock for these encoding processes during recording.
[0032]
The recording data generated by the encoding process is subjected to a recording compensation process by the reader / writer circuit 55 to finely adjust the optimum recording power for the characteristics of the recording layer, the spot shape of the laser beam, the recording linear velocity, etc. and to adjust the laser drive pulse waveform. After the operation is performed, it is sent to the laser driver 63 as a laser drive pulse.
The laser driver 63 supplies the supplied laser drive pulse to the laser diode in the pickup 51 to perform laser emission driving. As a result, pits (phase change marks) corresponding to the recording data are formed on the disk 1.
[0033]
The laser driver 63 includes a so-called APC circuit (Auto Power Control), and monitors the laser output power by the output of the laser power monitoring detector provided in the pickup 51, and changes the laser output regardless of the temperature or the like. Control to be constant. The target value of the laser output at the time of recording and at the time of reproduction is given from the system controller 60, and the control is performed so that the laser output level at the time of recording and at the time of reproduction respectively becomes the target value.
[0034]
The servo circuit 61 generates various servo drive signals for focus, tracking, and sled from the focus error signal and the tracking error signal from the matrix circuit 54, and executes the servo operation.
That is, a focus drive signal and a tracking drive signal are generated according to the focus error signal and the tracking error signal, and the focus coil and the tracking coil of the two-axis mechanism in the pickup 51 are driven. Thus, a tracking servo loop and a focus servo loop by the pickup 51, the matrix circuit 54, the servo circuit 61, and the two-axis mechanism are formed.
[0035]
Further, the servo circuit 61 turns off the tracking servo loop in response to a track jump command from the system controller 60 and outputs a jump drive signal to execute a track jump operation.
[0036]
Further, the servo circuit 61 generates a thread drive signal based on a thread error signal obtained as a low-frequency component of the tracking error signal, access execution control from the system controller 60, and the like, and drives the thread mechanism 53. Although not shown, the sled mechanism 53 includes a mechanism including a main shaft for holding the pickup 51, a sled motor, a transmission gear, and the like. Movement is performed.
[0037]
The spindle servo circuit 62 controls the spindle motor 2 to perform CLV rotation.
The spindle servo circuit 62 generates a spindle error signal by obtaining a clock generated by the PLL process for the wobble signal as current rotational speed information of the spindle motor 52 and comparing the obtained rotational speed information with predetermined CLV reference speed information. .
At the time of data reproduction, the reproduction clock (clock serving as a reference for the decoding process) generated by the PLL in the reader / writer circuit 55 becomes the current rotation speed information of the spindle motor 52. The spindle error signal can also be generated by comparing with the reference speed information.
Then, the spindle servo circuit 62 outputs a spindle drive signal generated according to the spindle error signal, and causes the spindle motor 62 to perform CLV rotation.
Further, the spindle servo circuit 62 generates a spindle drive signal in accordance with a spindle kick / brake control signal from the system controller 60, and also executes operations such as starting, stopping, accelerating, and decelerating the spindle motor 2.
[0038]
Various operations of the servo system and the recording / reproducing system as described above are controlled by a system controller 60 formed by a microcomputer.
The system controller 60 executes various processes according to a command from the AV system 120.
[0039]
For example, when a write command (write command) is issued from the AV system 120, the system controller 60 first moves the pickup 51 to an address to be written. Then, the ECC encoder / decoder 57 and the modulation / demodulation circuit 56 cause the data (for example, video data of various systems such as MPEG2, audio data, etc.) transferred from the AV system 120 to execute the encoding process as described above. Then, the laser drive pulse from the reader / writer circuit 55 is supplied to the laser driver 63 as described above, so that the recording is executed.
[0040]
Further, for example, when a read command requesting transfer of certain data (MPEG2 video data or the like) recorded on the disc 1 is supplied from the AV system 120, first, seek operation control is performed for the designated address. That is, a command is issued to the servo circuit 61 to execute the access operation of the pickup 51 targeting the address specified by the seek command.
After that, operation control necessary for transferring the data in the designated data section to the AV system 120 is performed. That is, data is read from the disk 1 and decoding / buffering in the reader / writer circuit 55, the modulation / demodulation circuit 56, and the ECC encoder / decoder 57 are executed, and the requested data is transferred.
[0041]
At the time of recording / reproducing data using these phase change marks, the system controller 60 controls access and recording / reproducing operations using the ADIP address detected by the wobble circuit 58 and the address decoder 59.
[0042]
In the example of FIG. 1, the disk drive is connected to the AV system 120. However, the disk drive of the present invention may be connected to, for example, a personal computer.
Further, there may be a mode in which the device is not connected to another device. In this case, an operation unit and a display unit are provided, and the configuration of an interface unit for data input / output is different from that in FIG. In other words, it is sufficient that recording and reproduction are performed in accordance with the operation of the user, and a terminal unit for inputting and outputting various data is formed.
Of course, various other configuration examples are conceivable, such as a recording-only device and a reproduction-only device.
[0043]
2. Spherical aberration correction mechanism
The spherical aberration correction mechanism of the pickup 51 is formed as shown in FIG. 2 or FIG. 2 and 3, the optical system in the pickup 51 is shown.
[0044]
In FIG. 2, laser light output from a semiconductor laser (laser diode) 81 is collimated by a collimator lens 82, passes through a beam splitter 83, and passes through collimator lenses 87 and 88 as a spherical aberration correcting mechanism. The light advances and is irradiated on the disk 1 from the objective lens 84.
The reflected light from the disk 1 passes through the objective lens 84 and the collimator lenses 88 and 87, is reflected by the beam splitter 83, and is incident on the detector 86 via the collimator lens (condenser lens 85).
[0045]
In such an optical system, the collimator lenses 87 and 88 have a function of changing the diameter of laser light. That is, since the collimator lens 87 is movable in the J direction, which is the optical axis direction, the diameter of the laser beam irradiated on the disk 1 is adjusted.
In other words, by performing control to cause the driving unit of the collimator lens 87 (not shown) to perform the forward and backward movement, it is possible to execute the spherical aberration correction.
[0046]
The example in FIG. 3A includes a liquid crystal panel 89 instead of the collimator lenses 87 and 88 in FIG.
That is, in the liquid crystal panel 89, the diameter of the laser beam can be varied by variably adjusting the boundary between the region where the laser beam is transmitted and the region where the laser beam is shielded, as shown by the solid line, the broken line, and the one-dot chain line in FIG. is there.
In this case, by controlling the drive circuit for driving the liquid crystal panel 89 to change the transmission area, spherical aberration correction can be executed.
[0047]
3. Configuration of servo system
FIG. 4 shows a portion forming the above-described focus servo loop and tracking servo loop and a portion relating to setting of a spherical aberration correction value in the servo circuit 61 in FIG.
[0048]
The focus error signal FE and the tracking error signal TE from the matrix circuit 54 are converted into digital data by A / D converters 11 and 21 in the servo circuit 61 and input to the DSP 10.
The DSP 10 has functions as a focus servo calculation unit 12 and a tracking servo calculation unit 22.
[0049]
Then, the focus error signal FE from the A / D converter 11 is input to the focus servo calculator 12 via the adder 15.
The focus servo calculation unit 12 generates and outputs a focus servo signal FS by performing predetermined calculations such as filtering for phase compensation and loop gain processing on the focus error signal FE input as digital data. I do. The focus servo signal FS is converted into an analog signal (including PWM and PDM) by the D / A converter 13 and then input to the focus driver 14 to drive the actuator. That is, in the optical pickup 51, a current is applied to the focus coil of the biaxial mechanism that holds the objective lens, and the focus servo operation is performed.
[0050]
The tracking servo calculation unit 22 performs a predetermined calculation such as filtering for phase compensation and the like and a loop gain process on the tracking error signal TE input as digital data to generate and output a tracking servo signal TS. I do. The tracking servo signal TS is converted into an analog signal by the D / A converter 23 (including PWM and PDM), and then input to the tracking driver 24 to drive the actuator. That is, in the optical pickup 51, a current is applied to the tracking coil of the biaxial mechanism that holds the objective lens, and the tracking servo operation is performed.
[0051]
Further, the DSP 10 is provided with functional parts for adding a focus bias, setting a spherical aberration correction value, and adjusting a focus bias and a spherical aberration correction value.
The adder 15 adds a focus bias to the focus error signal FE. The focus bias value to be added is set in the focus bias setting unit 16. When the focus bias setting unit 16 outputs the focus bias value detected / set in the adjustment processing described later, an appropriate focus bias is added to the focus servo loop.
[0052]
The spherical aberration correction value setting unit 20 sets a spherical aberration correction value by the spherical aberration correction mechanism. The set spherical aberration correction value is converted into an analog signal by the D / A converter 25 and supplied to the spherical aberration correction driver 26.
The spherical aberration correction driver 26 is, for example, a circuit that supplies drive power to a mechanism for moving the collimator lens 87 in the case of a spherical aberration correction mechanism as shown in FIG. In the case of the spherical aberration correcting mechanism as shown in FIG. 3, a circuit for controlling the voltage application to the required cells of the liquid crystal panel 89 is used.
Accordingly, the spherical aberration correction driver 26 drives the spherical aberration correction mechanism in the pickup 51 based on the spherical aberration correction value supplied from the spherical aberration correction value setting unit 20.
[0053]
The amplitude measuring unit 19 measures the amplitude of the tracking error signal TE. The method of measuring the amplitude basically uses envelope detection. In addition, averaging for a predetermined time, noise removal filter processing, an abnormal value elimination sequence, and the like are performed as necessary.
The adjustment value calculation unit 17 detects an optimum value as a focus bias value and a spherical aberration correction value by an adjustment process described later. At this time, the optimum value is detected using the amplitude measurement result of the tracking error signal TE by the amplitude measurement unit 19. Normally, the focus bias value and the spherical aberration correction value at which the tracking error amplitude becomes maximum are set as the optimum values.
The adjustment value calculation unit sets a focus bias value in the focus bias setting unit 16 and a spherical aberration correction value in the spherical aberration correction value setting unit 20 as a predetermined value for the adjustment operation or an optimum value as an adjustment result. I do.
The non-volatile memory 18 is used as a storage area for the optimum focus bias value and the spherical aberration correction value detected by the adjustment value calculation unit 17.
[0054]
The operations related to the focus servo calculation unit 12, the tracking servo calculation unit 22, and the adjustment of the focus bias / spherical aberration correction value formed in the DSP 10 as described above are controlled by the system controller 60.
[0055]
4. Example of adjustment processing [1]
4-1 Adjustment processing
Hereinafter, various examples of the focus bias and spherical aberration adjustment processing mainly performed by the processing of the servo circuit 61 having the configuration of FIG. 4 will be described.
First, the adjustment process example [1] will be described with reference to FIG. FIG. 5 shows processing executed by the DSP 10 according to an instruction from the system controller 60.
[0056]
First, in the adjustment process, the focus servo is turned on and the tracking servo is turned off in step F101.
In Step F102, the adjustment value calculation unit 17 sets an initial value for measurement as a focus bias value in the focus bias setting unit 16. The initial value for measurement may be stored in the nonvolatile memory 18 or the like as a predetermined value, for example.
[0057]
In a state where the focus bias value is fixed at the initial value, in step F103, the amplitude value of the tracking error signal obtained from the amplitude measurement unit 19 is observed while changing the spherical aberration correction value in the spherical aberration correction value setting unit 20. Then, a process of searching for the optimum value of the spherical aberration correction value is performed.
Specific examples of the search processing will be described later as examples of a three-point measurement method, an extended three-point measurement method, and an optimum value detection method.
[0058]
When the optimum value as the spherical aberration correction value is detected in the optimum value search processing in step F103, the adjustment value calculating unit 17 determines the optimum value of the detected spherical aberration correction value in step F104, and sets the spherical aberration correction value setting unit in step F104. Set to 20.
Then, in a state where the spherical aberration correction value is fixed to the optimum value, in step F105, the amplitude value of the tracking error signal obtained from the amplitude measuring unit 19 is observed while changing the focus bias value in the focus bias setting unit 16. Then, a process of searching for the optimum value of the focus bias value is performed.
This search process can also be executed in each example as a three-point measurement method, an extended three-point measurement method, and an optimum value detection method described later, as in the case of the spherical aberration correction value.
[0059]
When the optimum value as the focus bias value is detected in the optimum value search processing in step F105, the adjustment value calculation unit 17 sets the detected focus bias value optimum value in the focus bias setting unit 16 in step F106. .
[0060]
Through the above-described processing, the spherical aberration correction value and the focus bias value are adjusted to, for example, the optimum value that maximizes the amplitude of the tracking error signal.
This means that the focus bias and the spherical aberration correction value were adjusted so that the RF signal could be recorded and reproduced in the disk drive device employing the high numerical aperture and blue laser.
Therefore, thereafter, the recording / reproducing operation and other adjustments such as laser power adjustment, detailed spherical aberration correction using RF signals, focus bias correction, and the like can be appropriately performed.
[0061]
In particular, if the recording / reproducing characteristics are sufficient due to the focus bias and the spherical aberration correction value adjusted in the above adjustment processing, it is not always necessary to perform the focus bias adjustment by the RF signal and the adjustment by the spherical aberration correction mechanism, In this case, efficient operation is also realized.
[0062]
Further, since the spherical aberration correction value and the focus bias value at which the amplitude of the tracking error signal is optimum can be known, for example, even when using the adjustment result using the RF signal at the time of data recording / reproducing, the stability of the servo such as seeking can be improved. In the case where the performance is required, a method of operating using the focus bias and the spherical aberration correction value obtained by the above processing can be adopted.
[0063]
4-2 Detection operation by three-point measurement method
A three-point measurement method will be described as an example of the search processing in steps F103 and F105 in FIG. Note that the three-point measurement method, the extended three-point measurement method described later, and the optimum value detection method can be similarly employed in the adjustment processes [2] to [5] described later (FIGS. 9 to 12).
[0064]
For example, if the amplitude of the tracking error signal versus the focus bias value (or the spherical aberration correction value) has a quadratic function relationship, the tracking error amplitude at three focus bias values is obtained, and the optimal focus bias value (or the spherical aberration correction value) is obtained. Correction value) can be calculated.
In the following description, a focus bias is taken as an example of a parameter to be adjusted, but the adjustment of the spherical aberration correction value can be adjusted in exactly the same way.
[0065]
FIG. 6 shows an image diagram of adjustment by basic three-point measurement.
A predetermined focus bias B and a predetermined focus bias change step A are determined, and the focus bias is changed to three values of B−A, B, and B + A, and the amplitude value of the tracking error signal at each focus bias value is obtained. I do.
Then, the amplitude of the tracking error signal is approximated by drawing a quadratic curve with respect to the focus bias.
An actual tracking error signal often has a shape different from a quadratic curve as a focus bias characteristic. However, if a peak point approximated to a quadratic curve is obtained, it is the point where the margin is obtained as the actual tracking error signal curve. Since the possibility is high, this method is practically useful.
[0066]
Assuming that the amplitude of the tracking error signal is Y and the focus bias is X, the relationship is obtained by using a coefficient α, an X intercept β, and a Y intercept γ as parameters of a quadratic curve.
Y = α × (X + β) 2 + Γ (Equation 1)
It can be expressed by the formula.
In the above (Equation 1), the parameter to be obtained now is β. That is, the focus bias that gives the peak of the amplitude curve of the tracking error signal is the X intercept.
[0067]
Here, as shown in FIG. 6, when the amplitude values of the tracking error signal when the focus bias is BA, B, and B + A are Y (-1), Y (0), and Y (+1), respectively, By substituting each of Y (-1), Y (0), and Y (+1) into (Equation 1) and solving for β,
β = B + 0.5 × (Y (+1) −Y (−1)) / (2 × Y (0) −Y (+1) −Y (−1)) (Formula 2)
Is obtained.
Using this (Equation 2), a focus bias value that optimizes the amplitude of the tracking error signal can be obtained.
[0068]
As described above, if the amplitude value of the tracking error signal is acquired at each of the three points as the focus bias value and the optimum focus bias value is obtained by the calculation of the above (Equation 2), the optimum value of the focus bias value can be quickly obtained. Can be requested. Similarly, with respect to the spherical aberration correction value, the amplitude value of the tracking error signal is obtained for each of the three spherical aberration correction values, and the optimum value can be obtained by the calculation of the above (Equation 2).
Therefore, the adjustment time is fast for adjusting the focus bias and the spherical aberration correction value, and the time required for data recording / reproduction preparation can be reduced.
[0069]
4-3 Detection operation by extended three-point measurement method
Next, the extended three-point measurement method will be described.
The three-point measurement method described above can be applied to the optimum optimum irrespective of the tendency of the measured tracking error signal amplitude if the relationship between the amplitude of the tracking error signal and the focus bias (or the spherical aberration correction value) is almost a quadratic curve. A focus bias (or a spherical aberration correction value) can be calculated. However, in reality, it is not a perfect quadratic curve in many cases. Therefore, it is possible to calculate the optimum focus bias with higher accuracy by calculating at three points near the peak of the quadratic curve as much as possible.
[0070]
As an example, in FIG. 7, the values Y (−1), Y (0), and Y (+1) of the tracking error signal amplitude obtained at the points of the focus bias values BA, B, and B + A tend to decrease monotonically. It shows the case where there is.
In such a case, the focus bias is further moved by a predetermined focus bias change step A in the direction in which the tracking error increases. That is, the amplitude Y (-2) of the tracking error signal at the point B-2A is measured as the focus bias.
At this time, when the amplitude value Y (−2) shows a decreasing tendency with respect to the amplitude value Y (−1) as in the example of FIG. 7, three consecutive points including the newly added point, that is, , B-2A, B-A, and B, by using the amplitude values Y (-2), Y (-1), and Y (0) of the tracking error signal, the focus bias is optimized by the above (Equation 2). Values can be calculated. That is, in this case,
β = B−A + 0.5 × (Y (0) −Y (−2)) / (2 × Y (−1) −Y (0) −Y (−2)) (formula 3)
As a result, an optimum focus bias value can be calculated.
[0071]
Unlike the example of FIG. 7, if the amplitude value Y (-2) further increases with respect to the amplitude value Y (-1), the amplitude value Y of the tracking error signal at the focus bias at the point B-3A is further increased. (-3) is measured, and the amplitude value Y (-3) is compared with the amplitude value Y (-2). At this time, when the amplitude value Y (-3) shows a decreasing tendency with respect to the amplitude value Y (-2), three consecutive points including the newly added point, that is, B-3A, B2-A, The amplitude values Y (−3), Y (−2), and Y (−1) of the tracking error signal at BA may be used.
[0072]
As described above, the tracking error signal amplitude values Y (-1), Y (0), and Y (+1) tended to decrease monotonically at the initial three focus bias values BA, B, and B + A. In this case, the focus bias values B-2A, B-3A... Are changed and the amplitude values Y (−2), Y (−3). That is, the amplitude value of the tracking error signal is measured while changing the focus bias value to three or more patterns at equal intervals. Then, as the amplitude value of the tracking error signal, three consecutive points B-MA and B- including the point where the measurement is stopped at the time when the decreasing tendency is observed or when the number of times of the focus bias step addition reaches the limit N times. In (M-1) A and B- (M-2) A, the amplitude values Y (-M), Y (-(M-1)) and Y (-(M-2)) of the respective tracking error signals are calculated. Select and calculate the focus bias optimum value. That is, a generalized expression of the above (Equation 2) and (Equation 3),
β = B− (M−1) × A + 0.5 × (Y (− (M−2)) − Y (−M))
/ (2 × Y (-(M-1))-Y (-(M-2))-Y (-M)) (Equation 4)
The optimal focus bias can be calculated according to
[0073]
In the above, the case where the tracking error amplitude is monotonically decreased with respect to the focus bias has been described as an example. However, the case where the tracking error amplitude is monotonically increased can be similarly explained.
Such an extended three-point measurement method can appropriately cope with a case where a large amount of spherical aberration occurs (a case where a disc cover thickness error is large).
[0074]
4-4 Detection operation by optimal value detection method
In the three-point measurement method and the extended three-point measurement method, the optimum value is calculated by making the amplitude curve of the tracking error signal with respect to the focus bias or the spherical aberration correction value a quadratic curve, and approximating from the three point amplitude values. A method of directly searching for the peak point of the tracking error signal amplitude or searching for a point where the amplitude reduction is equal is considered.
There are several methods, and representative methods are shown below.
[0075]
<Pattern 1>
As shown in FIG. 8, B-NA, B- (N-1) A, ..., BA, B, B + A, ..., B + (N-1) A, B + NA, and the focus bias value , And the tracking error amplitudes Y (−N), Y (−N−1),..., Y (−1), Y (0), Y (+1),. (+ N-1) and Y (+ N) are measured.
Then, the focus bias value when the amplitude of the tracking error signal is maximum is optimized.
[0076]
<Pattern 2>
By moving the focus bias value as B-NA, B- (N-1) A,..., The tracking error amplitude in each case is measured. The inflection point is set as an optimum focus bias value.
[0077]
<Pattern 3>
B-NA, B- (N-1) A,..., B-A, B, B + A,..., B + (N-1) A, B + NA The tracking error amplitude at two points equidistant (C) from is measured.
For example, when the focus bias is B, the amplitude values of BC and B + C are measured. When the focus bias is B + A, the amplitude values of B + AC and B + A + C are measured.
Then, the focus bias value when the tracking error amplitude difference between the two points is closest is set as the optimum focus bias.
[0078]
For example, in the case of such an optimum value detection method, the optimum value detection process requires more time than the above three-point measurement method. However, even if the amplitude curve of the tracking error signal is not a quadratic curve, an optimum focus bias is accurately obtained. Values and spherical aberration correction values can be detected.
[0079]
5. Adjustment processing example [2]
Next, focus bias and spherical aberration adjustment processing will be described as an example of adjustment processing [2] with reference to FIG.
In the adjustment process example [1], after the optimum value of the spherical aberration correction value is detected and set, the optimum value of the focus bias value is detected and set. The adjustment process example [2] is executed in the reverse order.
[0080]
In the adjustment process, the focus servo is turned on and the tracking servo is turned off in step F201 in FIG.
In step F202, the adjustment value calculation unit 17 sets an initial value for measurement as a spherical aberration correction value in the spherical aberration correction value setting unit 20. The initial value for measurement may be stored in the nonvolatile memory 18 or the like as a predetermined value, for example.
[0081]
In a state where the spherical aberration correction value is fixed at the initial value, in step F203, while changing the focus bias value in the focus bias setting unit 16, the amplitude value of the tracking error signal obtained from the amplitude measurement unit 19 is observed, and the focus is adjusted. A process for searching for an optimum bias value is performed. That is, the above-described three-point measurement method, the extended three-point measurement method, the optimum value detection method, and the like are executed.
[0082]
When the optimum value as the focus bias value is detected in the optimum value search processing in step F203, the adjustment value calculation unit 17 sets the detected focus bias value optimum value in the focus bias setting unit 16 in step F204. .
In a state where the focus bias value is fixed to the optimum value, in step F205, while changing the spherical aberration correction value in the spherical aberration correction value setting unit 20, the amplitude value of the tracking error signal obtained from the amplitude measurement unit 19 is changed. Observation is performed to search for an optimum spherical aberration correction value. That is, a three-point measurement method, an extended three-point measurement method, an optimum value detection method, and the like are executed.
[0083]
When the optimum value as the spherical aberration correction value is detected in the optimum value search processing in step F205, the adjustment value calculating unit 17 determines the optimum value of the detected spherical aberration correction value in step F206, and sets the spherical aberration correction value setting unit in step F206. Set to 20.
Through the above-described processing, the spherical aberration correction value and the focus bias value are adjusted to, for example, the optimum value that maximizes the amplitude of the tracking error signal.
[0084]
6. Adjustment processing example [3]
FIG. 10 shows an example of the adjustment process [3].
In the process of FIG. 10, steps F301, F303 to F306 are the same as steps F101, F103 to F106 in the adjustment process example [1] of FIG.
[0085]
In the process of FIG. 10, the adjustment value calculation unit 17 stores the optimum value of the focus bias and the optimum value of the spherical aberration correction value in the nonvolatile memory 18 in step F307.
That is, the non-volatile memory 18 detects the focus bias value set in the focus bias setting unit 16 and the spherical aberration correction value set in the spherical aberration correction value setting unit 20, which are detected by the optimum value search processing similar to FIG.
[0086]
In step F302, an optimal focus bias value detected during the previous adjustment process and stored in the nonvolatile memory 18 is set as a focus bias value fixed to an initial value in order to search for an optimal spherical aberration correction value. Like that.
By setting the previous focus bias optimum value as the measurement initial value, the optimum value of the spherical aberration correction value can be more accurately detected.
[0087]
Storing the optimum values of the focus bias and the spherical aberration correction value in the non-volatile memory 18 also enables the setting to the optimum values when necessary.
For example, even if the adjustment using the RF signal is performed after the adjustment in this example, the setting can be changed to the adjustment result based on the observation of the amplitude of the tracking error signal when necessary.
[0088]
Incidentally, in the procedure of the adjustment process example [2] of FIG. 9, the processes of steps F302 and F307 of FIG. 10 may be applied.
In that case, an initial value is first set as a spherical aberration correction value. However, if the previous spherical aberration correction value optimum value stored in the nonvolatile memory 18 is used as the initial value of the spherical aberration correction value, Good.
[0089]
Further, in step F302 in FIG. 10, in addition to using the previous optimum value as the initial value, the past optimum value stored in the nonvolatile memory 18 is used, such as using the average value of the past n optimum values. There are various ways to do this.
[0090]
As a storage method for the non-volatile memory 18, for example, the non-volatile memory 18 may be used in a ring buffer form, and a predetermined number of past optimum value histories may be stored.
Alternatively, the optimal value stored in the nonvolatile memory 18 may be cleared, for example, when the disk 1 is replaced, so that the optimal value according to the current disk is stored. .
Further, regardless of the replacement of the disk 1, a predetermined number of samples of a required number of optimum values are stored for a certain long period of time, and the aging of devices such as a biaxial mechanism and a spherical aberration correction mechanism (change in response). May be set so that the initial value of the measurement is reflected.
[0091]
7. Adjustment processing example [4]
An example of the adjustment process [4] will be described with reference to FIG.
In the adjustment processing example [4], the detection of the optimum focus bias value and the detection of the optimum spherical aberration correction value are alternately and repeatedly performed.
[0092]
First, in step F401, the focus servo is turned on and the tracking servo is turned off. Then, in a step F402, the variable n is set to 1. The variable n is a variable for controlling the number of repetitions of the optimum value detection.
[0093]
In step F403, the adjustment value calculation unit 17 sets an initial value for measurement as a focus bias value in the focus bias setting unit 16. This initial value for measurement is, for example, an optimum value detected in the previous adjustment processing stored in the nonvolatile memory 18.
[0094]
In a state where the focus bias value is fixed at the initial value, in step F404, the amplitude value of the tracking error signal obtained from the amplitude measurement unit 19 is observed while changing the spherical aberration correction value in the spherical aberration correction value setting unit 20. Then, a process of searching for the optimum value of the spherical aberration correction value is performed. That is, the optimum spherical aberration correction value is detected by a three-point measurement method, an extended three-point measurement method, an optimum value detection method, or the like.
[0095]
When the optimum value as the spherical aberration correction value has been detected in the optimum value search processing in step F404, the adjustment value calculation unit 17 determines the detected spherical aberration correction value in step F405 as the spherical aberration correction value setting unit. Set to 20.
Then, in a state where the spherical aberration correction value is fixed to the optimum value, in step F406, the amplitude value of the tracking error signal obtained from the amplitude measurement unit 19 is observed while changing the focus bias value in the focus bias setting unit 16. Then, a process of searching for the optimum value of the focus bias value is performed. That is, the focus bias optimum value is detected by a three-point measuring method, an extended three-point measuring method, an optimum value detecting method, or the like.
[0096]
When the optimum value as the focus bias value is detected in the optimum value search processing in step F406, the adjustment value calculation unit 17 sets the detected optimum value of the focus bias value in the focus bias setting unit 16 in step F407. .
Then, in a step F408, it is determined whether or not the variable n has reached a predetermined value K. The predetermined value K is a value determined as the number of repetitions.
[0097]
If n <K, the variable n is incremented in step F410, and the process returns to step F404.
At this time, the focus bias optimum value is set in the focus bias setting unit 16 in step F407. Therefore, in step F404, the spherical aberration correction value setting unit 20 fixes the spherical bias correction value in the state where the focus bias optimum value is fixed. While changing the value, the amplitude value of the tracking error signal obtained from the amplitude measurement unit 19 is observed, and a process of searching for the optimum value of the spherical aberration correction value is performed.
[0098]
If the optimum value as the spherical aberration correction value can be detected in step F404, the optimum value of the detected spherical aberration correction value is set in the spherical aberration correction value setting unit 20 in step F405. Then, in a state where the spherical aberration correction value is fixed to the optimum value, in step F406, the focus bias setting unit 16 performs a process of searching for the optimum value of the focus bias value while changing the focus bias value.
Then, in step F407, the optimum value of the detected focus bias value is set in the focus bias setting unit 16.
[0099]
Such processing is repeated until it is determined in step F408 that the variable n has reached the predetermined value K.
When the K repetition processing is completed, the process proceeds to step F409, where the optimum focus bias value and the optimum spherical aberration correction value set at that time are stored in the nonvolatile memory 18, and the processing ends.
[0100]
Through the above processing, the spherical aberration correction value and the focus bias value are adjusted to the optimum values.
In particular, as the focus bias and the spherical aberration correction value, the process of searching for the optimum value is repeatedly performed in a state where the other optimum value detected immediately before is fixed. Since it is driven and converged, more accurate adjustment can be performed.
[0101]
In the example of FIG. 11, the search is performed in the order of the optimum value of the spherical aberration correction value → the search of the optimum value of the focus bias → the search of the optimum value of the spherical aberration correction value →. The search may be performed in the following order: value search → optimal value search for spherical aberration correction value → optimal value search for focus bias →.
[0102]
8. Adjustment processing example [5]
The adjustment process example [5] will be described with reference to FIG.
The adjustment process example [5] is to eliminate inappropriate values when detecting the optimum value of the focus bias and the optimum value of the spherical aberration correction value.
[0103]
Steps F501, F502, F503, F505, F507, F509, and F511 in FIG. 12 are the same as steps F301 to F307 in FIG.
In this case, when the process of searching for the optimum spherical aberration correction value is performed in step F503, it is determined in step F504 whether the detected optimum value is within a predetermined range. Here, the predetermined range is a range in which it can be determined that the spherical aberration correction value is not an abnormal value. For example, an appropriate range is set in advance.
If the detected optimum value of the spherical aberration correction value is within the predetermined range, the detected optimum value is set in the spherical aberration correction value setting unit 20 in step F505.
However, if the detected spherical aberration correction value optimum value is not within the predetermined range, the process proceeds to step F506, where the detected optimum value is discarded, and the optimum value is determined from the value stored in the nonvolatile memory 18. Then, it is set in the spherical aberration correction value setting unit 20. For example, the spherical aberration correction value optimum value at the time of the previous adjustment processing is applied.
[0104]
Further, when the search processing of the focus bias optimum value is executed in step F507, it is determined in step F508 whether the detected optimum value is a value within a predetermined range. The predetermined range is a range in which the focus bias value can be determined not to be an abnormal value.
If the detected focus bias optimum value is within the predetermined range, the detected optimum value is set in the focus bias setting unit 16 in step F509.
However, if the detected focus bias optimum value is not within the predetermined range, the process proceeds to step F510, where the detected optimum value is discarded, and the optimum value is obtained from the value stored in the nonvolatile memory 18; It is set in the focus bias setting unit 16. For example, the focus bias optimum value at the time of the previous adjustment processing is applied.
[0105]
By such processing, if an abnormal value is detected in the optimum value search processing, it is prevented that the abnormal value is used as the optimum value, so that the error can be prevented from expanding.
At this time, if the past optimum value stored in the nonvolatile memory 18 or the average value of the past optimum values is used, the state of a certain appropriate value can be maintained.
[0106]
When the optimum value determined as an abnormal value is discarded, it is conceivable to use not only an optimum value obtained by past adjustment processing such as the previous one but also a fixed value set in advance as an optimum value to be used instead.
Further, a combination of the process of discarding the abnormal value as the optimum value and the process of executing the repeated optimum value search shown in FIG. 11 is also suitable for improving the accuracy of the adjustment process.
[0107]
9. Adjustment timing
There are various possible timings for executing the adjustment processing described as various examples as the adjustment processing examples [1] to [5].
First, it is appropriate to execute it when a disc is loaded. When a disc is loaded, processing such as reading out management information of the disc is usually performed. For this reason, that is, in order to reproduce an RF signal, the focus bias and the spherical aberration must be adjusted. Therefore, when the disc is loaded, it is appropriate to first perform the adjustment processing.
[0108]
Further, it may be executed during reproduction, before or after a seek, after a predetermined time has elapsed, or executed according to a trace position (inner / outer circumference) on a disk.
For example, during reproduction, the data read from the disk 1 can be performed at a time when there is enough buffering.
The timing immediately before the seek or immediately after the seek is also suitable as the execution timing of the adjustment processing.
[0109]
In addition, by adjusting according to the temperature condition of the equipment (the change of the optimum value of the focus bias due to the temperature characteristics of the device and the actuator), aging, and the trace position (radial position) on the disk, adjustment corresponding to these circumstances is made. It can be in a state.
Therefore, even during the operation period of the disk 1, for example, the adjustment process is performed regularly or irregularly, which is appropriate for stabilizing the operation of the apparatus. It is also conceivable that the servo gain adjustment processing is performed using a detection of a temperature change, a deterioration of an error rate / jitter of reproduced data, etc. as a trigger.
[0110]
10. Modified example
The present invention is not limited to the above embodiment, and various modifications are possible.
In particular, in addition to the adjustment processing examples [1] to [5], various adjustment processing procedures can be considered.
[0111]
In addition, the optimum value detection method described in the three-point measurement method and the like can be variously considered.
For example, according to the examples of FIGS. 6 to 8, the optimum value of the spherical aberration correction value and the tracking error amplitude are stored as the focus bias BA, and then the optimum value of the spherical aberration correction value and the focus bias B are stored. The tracking error amplitude is stored, and the optimum value of the spherical aberration correction value corresponding to each focus bias is checked in a state such as..., And the most desirable condition (the tracking error amplitude is maximized, the spherical aberration correction amount is small) , A small amount of focus bias, etc.) and a spherical aberration correction value. That is, a two-dimensional map is drawn using the focus bias and the spherical aberration correction value to find an optimum point.
Of course, on the contrary, a method of searching for the optimum value of the two-dimensional map using the optimum value of the focus bias and the tracking error amplitude while moving the spherical aberration correction value is also conceivable.
[0112]
When such a method is used, the optimum values of the focus bias and the spherical aberration correction value are determined simultaneously, so that the adjustment processing procedure is different from the above adjustment processing examples [1] to [5]. Become.
That is, after the focus servo is turned on and the tracking servo is turned off, a process of searching the two-dimensional map for the optimum value of the focus bias and the spherical aberration correction value is performed by the above-described method, and the detected optimum values are determined by the focus bias setting unit 16 and the spherical aberration correction unit. The processing procedure is to set the correction value in the correction value setting unit 20.
[0113]
【The invention's effect】
As can be understood from the above description, according to the present invention, the optimal focus bias value and the optimal spherical aberration correction value can be found using the amplitude of the tracking error signal. Without the adjustment of the focus bias, it is possible to provide a technology that can be said to be indispensable in a disk drive device in which it is not possible to guarantee all other adjustments, for example, detailed spherical aberration correction and focus bias correction using a laser power or an RF signal. That is, by adjusting to the optimum focus bias value and the optimum spherical aberration correction value using the amplitude of the tracking error signal, the reliability of the subsequent recording / reproducing operation and the adjusting operation is improved, and thus the recording / reproducing performance is improved. Can be done.
Also, since the spherical aberration correction correction value and the focus bias value at which the tracking error is optimal can be known, the servo stability such as seeking can be improved even when the adjustment result using the RF signal is used at the time of data recording / reproduction. When required, a method of operating using the focus bias and the spherical aberration correction value obtained by the present invention can be adopted.
[0114]
Also, as a specific procedure, the focus bias is set to a predetermined value, the tracking error signal is observed while changing the spherical aberration correction value, the optimum spherical aberration correction value is detected and set, and then the focus bias value is set. The operation of observing the tracking error signal while changing and detecting the optimal focus bias value makes it possible to easily detect the optimal values of the focus bias and the spherical aberration correction value.
Alternatively, conversely, the spherical aberration correction value is set to a predetermined value, the tracking error signal is observed while changing the focus bias value, the optimum focus bias value is detected and set, and then the spherical aberration correction value is changed. The same applies to the operation of observing the tracking error signal while detecting the optimum spherical aberration correction value.
[0115]
In addition, by storing the detected optimum value of the focus bias and the optimum value of the spherical aberration correction value in the storage unit, the above-described detection operation can be performed using the previous optimum value, the past optimum value average value, and the like. As a result, an efficient and highly accurate detection / setting operation can be performed.
If the detected optimum value is not within the predetermined range, it is appropriate to set a detection error to maintain operation reliability, and in that case, by applying the stored past optimum value, Can also respond appropriately.
[0116]
A process of setting a focus bias, observing a tracking error signal while changing the spherical aberration correction value, and detecting an appropriate spherical aberration correction value based on the amplitude of the observed tracking error signal; And then alternately repeat the process of observing the tracking error signal while changing the focus bias value, and detecting the appropriate focus bias value based on the amplitude of the observed tracking error signal. In addition, the optimum values of the focus bias value and the spherical aberration correction value can be driven in, and more accurate adjustment can be performed.
[0117]
As a specific detection process of each optimum value, the focus bias value or the spherical aberration correction value is changed from a predetermined value at three equal intervals, and the amplitude of the tracking error signal in each case is measured. By calculating the quadratic curve approximation using the three measurement results to detect the optimum value of the focus bias or the optimum value of the spherical aberration correction value, the detection can be performed easily and quickly. In other words, although the focus bias and the spherical aberration correction value are adjusted, the adjustment time is short, and the time until data recording and reproduction preparation is completed can be reduced.
[0118]
Further, the focus bias value or the spherical aberration correction value is changed from a predetermined value to three or more types at equal intervals, the amplitude of the tracking error signal in each case is measured, and the amplitude is selected based on each measurement result. When an optimum value of the focus bias or an optimum value of the spherical aberration correction value is detected by an arithmetic process of performing quadratic curve approximation using three measurement results, a case where a large amount of spherical aberration occurs (disc cover thickness) In the case where the error is large, appropriate adjustment can be performed.
[0119]
Further, while changing the focus bias value or the spherical aberration correction value from a predetermined value, the amplitude of the tracking error signal is measured, and the value at which the amplitude of the tracking error signal is optimal is determined as the optimal value of the focus bias, or Appropriate adjustment is also possible by the method of detecting the spherical aberration correction value as the optimum value. This is particularly effective when it is assumed that the method using the quadratic curve approximation is not suitable.
[Brief description of the drawings]
FIG. 1 is a block diagram of a disk drive device according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of an example of a spherical aberration correction mechanism according to the embodiment.
FIG. 3 is an explanatory diagram of an example of a spherical aberration correction mechanism according to the embodiment.
FIG. 4 is a block diagram of a main part of the servo circuit according to the embodiment;
FIG. 5 is a flowchart of an adjustment process example [1] of the embodiment.
FIG. 6 is an explanatory diagram of a detection operation according to the three-point measurement method of the embodiment.
FIG. 7 is an explanatory diagram of a detection operation according to the extended three-point measurement method of the embodiment.
FIG. 8 is an explanatory diagram of a detection operation according to the optimum value detection method of the embodiment.
FIG. 9 is a flowchart of an adjustment process example [2] of the embodiment.
FIG. 10 is a flowchart of an adjustment process example [3] of the embodiment.
FIG. 11 is a flowchart of an adjustment process example [4] of the embodiment.
FIG. 12 is a flowchart of an adjustment process example [5] of the embodiment.
[Explanation of symbols]
1 disk, 10 DSP, 11, 21 A / D converter, 12 focus servo calculation unit, 13, 23, 25 D / A converter, 14 focus driver, 15 adder, 16 focus bias setting unit, 17 adjustment value calculation Unit, 18 nonvolatile memory, 19 amplitude measurement unit, 20 spherical aberration correction value setting unit, 22 tracking servo calculation unit, 24 tracking driver, 26 spherical aberration correction driver, 51 pickup, 52 spindle motor, 53 thread mechanism, 54 matrix circuit , 55 reader / writer circuit, 56 modulation / demodulation circuit, 57 ECC encoder / decoder, 58 wobble circuit, 59 address decoder, 60 system controller, 61 servo circuit, 62 spindle servo circuit, 63 laser driver, 120 AV system

Claims (24)

  1. For writing or reading data, while performing laser irradiation and reflected light detection on the disk recording medium, a laser light focus servo mechanism, a tracking servo mechanism, and a head means having a spherical aberration correction mechanism,
    An error signal generating means for generating a focus error signal and a tracking error signal from reflected light obtained by the head means,
    Focus servo means for generating a focus servo drive signal based on the focus error signal and driving the focus servo mechanism to execute focus servo;
    A tracking servo means for generating a tracking servo drive signal based on the tracking error signal and driving the tracking servo mechanism to execute tracking servo;
    A spherical aberration correction unit that generates a spherical aberration correction drive signal based on the spherical aberration correction value, and drives the spherical aberration correction mechanism to perform spherical aberration correction;
    Focus bias means for adding a focus bias to a focus loop including the focus servo means;
    While observing the tracking error signal, the optimum value of the focus bias and the optimum value of the spherical aberration correction value are detected, and the focus bias value to be added by the focus bias unit and the spherical aberration correction by the spherical aberration correction unit Adjusting means for setting each value to an optimum value;
    A disk drive device comprising:
  2. The adjusting means,
    The focus bias to be added by the focus bias means is set to a predetermined value, the tracking error signal is observed while changing the spherical aberration correction value, and the optimum spherical aberration correction value is determined based on the amplitude of the observed tracking error signal. After detecting
    The optimum spherical aberration correction value is set in the spherical aberration correction means, the tracking error signal is observed while changing the focus bias value, and the optimum focus bias value is detected based on the amplitude of the observed tracking error signal. 2. The disk drive device according to claim 1, wherein a focus bias added by the focus bias unit is set to the optimum focus bias value.
  3. The adjusting means,
    The spherical aberration correction value in the spherical aberration correction means is set to a predetermined value, the tracking error signal is observed while changing the focus bias value, and an optimum focus bias value is determined based on the amplitude of the observed tracking error signal. After detection,
    Setting the optimum focus bias value in the focus bias means, observing the tracking error signal while changing the spherical aberration correction value, and detecting the optimum spherical aberration correction value based on the amplitude of the observed tracking error signal. 2. The disk drive device according to claim 1, wherein a spherical aberration correction value in said spherical aberration correction means is set to said optimum spherical aberration correction value.
  4. With storage means,
    2. The disk drive device according to claim 1, wherein the adjusting unit stores the detected optimum value of the focus bias and the optimum value of the spherical aberration correction value in the storage unit.
  5. The adjusting means,
    A focus bias value to be added by the focus bias unit when the tracking error signal is observed while changing the spherical aberration correction value and an optimum spherical aberration correction value is detected based on the amplitude of the observed tracking error signal. 5. The disk drive according to claim 4, wherein is set to a value stored in said storage means.
  6. The adjusting means,
    Observing the tracking error signal while changing the focus bias value, when detecting an optimal focus bias value based on the amplitude of the observed tracking error signal, the spherical aberration correction value in the spherical aberration correction means, 5. The disk drive according to claim 4, wherein the value is set to a value stored in the storage unit.
  7. The adjusting means,
    The tracking bias signal is observed while changing the spherical aberration correction value by setting a focus bias to be added by the focus bias means, and an appropriate spherical aberration correction value is detected based on the amplitude of the observed tracking error signal. Processing,
    A process of setting a spherical aberration correction value in the spherical aberration correction means, observing the tracking error signal while changing a focus bias value, and detecting an appropriate focus bias value based on the amplitude of the observed tracking error signal. And
    2. The disk drive device according to claim 1, wherein an optimal focus bias value and a spherical aberration correction value are detected alternately and repeatedly.
  8. The adjustment means sets an error in the detection result when the detected optimum value of the focus bias or the detected optimum value of the spherical aberration correction value does not fall within a predetermined range. 2. The disk drive device according to 1.
  9. With storage means,
    The adjusting means stores the detected focus bias optimum value and the spherical aberration correction value optimum value in the storage means,
    When the detection result of the detected optimum value of the focus bias or the detected optimum value of the spherical aberration correction value is regarded as an error, the optimum value of the focus bias or the optimum value of the spherical aberration correction value is stored in the storage unit. 9. The disk drive device according to claim 8, wherein a certain value is applied.
  10. The adjusting means,
    The focus bias value or the spherical aberration correction value is changed from a predetermined value at three equal intervals, the amplitude of the tracking error signal in each case is measured, and a quadratic curve approximation is performed using the three measurement results. 2. The disk drive device according to claim 1, wherein an optimum value of the focus bias or an optimum value of the spherical aberration correction value is detected by a calculation process performed.
  11. The adjusting means,
    The focus bias value or the spherical aberration correction value is changed from a predetermined value to three or more types at equal intervals, the amplitude of the tracking error signal in each case is measured, and three values selected based on each measurement result are measured. 2. The disk drive device according to claim 1, wherein an optimum value of the focus bias or an optimum value of the spherical aberration correction value is detected by an arithmetic process of performing quadratic curve approximation using a measurement result.
  12. The adjusting means,
    While changing the focus bias value or the spherical aberration correction value from a predetermined value, the amplitude of the tracking error signal is measured, and the value at which the amplitude of the tracking error signal is optimum is determined as the optimum value of the focus bias or the spherical surface. The disk drive device according to claim 1, wherein the disk drive device detects the aberration correction value as an optimum value.
  13. In order to write or read data, laser irradiation and reflected light detection are performed on a disk recording medium, and a focus bias and a spherical surface in a disk drive apparatus having a laser light focus servo mechanism, a tracking servo mechanism, and a spherical aberration correction mechanism. As an aberration adjustment method,
    With the focus servo turned on and the tracking servo turned off, the optimum value of the focus bias to be added to the focus servo loop and the optimum value of the spherical aberration correction value are observed while observing the tracking error signal generated from the reflected light. Detect
    A focus bias and spherical aberration adjustment method, wherein a focus bias value to be added to the focus servo loop and a spherical aberration correction value for driving the spherical aberration correction mechanism are respectively set to the detected optimum values.
  14. By setting the focus bias to a predetermined value, observing the tracking error signal while changing the spherical aberration correction value, and detecting an optimal spherical aberration correction value based on the amplitude of the observed tracking error signal,
    Setting the optimum spherical aberration correction value, observing the tracking error signal while changing the focus bias value, detecting the optimum focus bias value based on the amplitude of the observed tracking error signal, and setting the focus bias 14. The focus bias and spherical aberration adjustment method according to claim 13, wherein the optimal focus bias value is set.
  15. After setting the spherical aberration correction value to a predetermined value, observing the tracking error signal while changing the focus bias value, detecting the optimal focus bias value based on the amplitude of the observed tracking error signal, The tracking error signal is observed while changing the spherical aberration correction value by setting a proper focus bias value, and the optimum spherical aberration correction value is detected based on the amplitude of the observed tracking error signal, and the spherical aberration correction 14. The focus bias and spherical aberration adjustment method according to claim 13, wherein a value is set to the optimum spherical aberration correction value.
  16. 14. The focus bias and spherical aberration adjusting method according to claim 13, wherein the detected optimum value of the focus bias and the optimum value of the spherical aberration correction value are stored in a storage unit.
  17. Observing the tracking error signal while changing the spherical aberration correction value, and detecting the optimal spherical aberration correction value based on the amplitude of the observed tracking error signal, stores the focus bias value in the storage unit. 17. The focus bias and spherical aberration adjustment method according to claim 16, wherein the value is set to a stored value.
  18. Observing the tracking error signal while changing the focus bias value, and storing the spherical aberration correction value in the storage means when detecting an optimal focus bias value based on the amplitude of the observed tracking error signal. 17. The focus bias and spherical aberration adjustment method according to claim 16, wherein the values are set to predetermined values.
  19. Setting the focus bias, observing the tracking error signal while changing the spherical aberration correction value, and detecting an appropriate spherical aberration correction value based on the amplitude of the observed tracking error signal;
    A process of setting the spherical aberration correction value, observing the tracking error signal while changing the focus bias value, and detecting an appropriate focus bias value based on the amplitude of the observed tracking error signal,
    14. The focus bias and spherical aberration adjustment method according to claim 13, wherein the optimal focus bias value and spherical aberration correction value are detected alternately and repeatedly.
  20. 14. The focus according to claim 13, wherein if the detected optimum value of the focus bias or the detected optimum value of the spherical aberration correction value does not fall within a predetermined range, the detection result is regarded as an error. Bias and spherical aberration adjustment method.
  21. While storing the optimum value of the detected focus bias and the optimum value of the spherical aberration correction value in the storage unit,
    When the detection result of the detected optimum value of the focus bias or the detected optimum value of the spherical aberration correction value is regarded as an error, the optimum value of the focus bias or the optimum value of the spherical aberration correction value is stored in the storage unit. 21. The focus bias and spherical aberration adjusting method according to claim 20, wherein a certain value is applied.
  22. The focus bias value or the spherical aberration correction value is changed from a predetermined value at three equal intervals, the amplitude of the tracking error signal in each case is measured, and a quadratic curve approximation is performed using the three measurement results. 14. The focus bias and spherical aberration adjusting method according to claim 13, wherein an optimal value of the focus bias or an optimal value of the spherical aberration correction value is detected by the arithmetic processing performed.
  23. The focus bias value or the spherical aberration correction value is changed from a predetermined value to three or more types at equal intervals, the amplitude of the tracking error signal in each case is measured, and three values selected based on each measurement result are measured. The focus bias and the spherical aberration according to claim 13, wherein an optimum value of the focus bias or an optimum value of the spherical aberration correction value is detected by an arithmetic process of performing quadratic curve approximation using the measurement result. Adjustment method.
  24. While changing the focus bias value or the spherical aberration correction value from a predetermined value, the amplitude of the tracking error signal is measured, and the value at which the amplitude of the tracking error signal is optimum is determined as the optimum value of the focus bias or the spherical surface. 14. The focus bias and spherical aberration adjustment method according to claim 13, wherein the aberration correction value is detected as an optimum value.
JP2002257584A 2002-09-03 2002-09-03 Disk drive device, focus bias, and spherical aberration adjustment method Expired - Fee Related JP4154962B2 (en)

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