JP2002050063A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device capable of securing radial skew margin and reducing access time of a pickup. SOLUTION: A skew sensor 50 emits a light beam to the recording face 1A of an optical disk 1, receives the light beam reflected on the recording face 1A by two light receiving elements, and outputs them as voltage signals A, B. The voltage signals A, B are inputted in a read processor 200, with a radial skew measured. The skew motor 70 is rotatably driven, the revolution of a cam 80 moves a pin 90 vertically, turning a sub-chassis 20 up and down around an axis part 24. By the rotary driving of the skew motor 80, the radial skew of the pickup 40 is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skew control device for controlling a radial skew of a pickup with respect to an optical disk in an optical disk device.

[0002]

2. Description of the Related Art An optical disk device is configured to generate a reproduction signal by reading a pit recorded on a recording surface of an optical disk (recording medium) by a pickup. The inclination of the optical axis of the optical system of the pickup with respect to the radial direction of the optical disk with respect to the recording surface of the optical disk is called radial skew. Also, 1/2 of the amplitude of the reproduced signal
The level of the reproduced signal is binarized as a reference level (zero level). At this time, a point (zero cross point) at which the original signal indicated by the pit recorded on the optical disc intersects with the reference level of the reproduced signal generated (zero cross point) Is referred to as jitter (value). This jitter value increases as the radial skew increases. The allowable range of the radial skew corresponding to the allowable range of the jitter is called a radial skew margin.

[0003] In recent years, the radial skew margin in optical disk devices has tended to be reduced due to the increase in the density of optical disks. Conventionally, since there is a relatively large radial skew margin, the access time required for seeking (moving) the pickup to a specified disk position has been emphasized. In other words, the jitter value is measured during the seek operation of the pickup, and if the jitter value of the reproduced signal at the disc position is within a certain range with respect to the jitter bottom (minimum jitter value), the radial skew is adjusted. Did not do. On the other hand, when the jitter value deviates from a certain range, the bottom of the jitter is searched for while adjusting the radial skew of the pickup so that the jitter value becomes the minimum value. Conventionally, there is a margin in the radial skew margin, and even if the radial skew is adjusted, the frequency of the adjustment is small, so that the influence on the access time of the pickup does not cause much problem.

FIG. 6 is a diagram showing a jitter curve, in which the horizontal axis represents the radial skew R and the vertical axis represents the jitter value J (%). The measurement of the jitter and the adjustment of the radial skew described above will be described with reference to FIG. A range ΔJ indicated by a broken line in FIG. 6 corresponds to an allowable range of the jitter value. After the seek of the pickup, the jitter of the reproduced signal is measured to check whether the jitter value is within a predetermined allowable range. At this time, if the measured jitter value J1 is out of the predetermined allowable range ΔJ, it is determined whether the radial skew of the pickup corresponds to point A or point B, which is the intersection of the jitter value J1 and the jitter curve. Judgment must be made to determine the direction and amount of radial skew movement, and to perform the operation of adjusting the radial skew so that the jitter value falls within the jitter allowable range ΔJ. The time for determining the operation direction and amount of the radial skew greatly affects the access time.

[0005]

As the recording capacity of the optical disc increases and the recording density increases, the margin of the radial skew margin becomes smaller, so that the frequency of adjusting the radial skew is increased each time the pickup seeks. It is inevitable that access time will be long. An object of the present invention is to solve such a problem of the prior art, and an object of the present invention is to provide an optical disc device capable of securing a radial skew margin and shortening the access time of a pickup. It is in.

[0006]

According to the present invention, there is provided a pickup for reading a pit recorded on a recording surface of a rotationally driven optical disk and outputting a reproduced signal, a jitter detecting circuit for detecting a jitter value of the reproduced signal, An optical disc device including a radial skew adjustment mechanism for adjusting the tilt of the pickup so as to have a set radial skew, a radial skew detection unit for detecting the radial skew, and a radial skew for minimizing the jitter value. Storage means for storing as a first set value corresponding to the type of an optical disc reproducible by the optical disc apparatus, and the optical disc mounted when the optical disc in which pits are recorded is mounted on the optical disc apparatus Reading the first set value corresponding to the type of First control means for setting the radial skew adjustment mechanism; and the radial skew when the jitter value detected by the jitter detection circuit in the state where the radial skew is the first set value by the radial skew adjustment mechanism is within an allowable range. If the jitter value exceeds the allowable range, the radial skew adjustment mechanism is controlled so that the jitter value detected by the jitter detection circuit becomes the minimum value, and the jitter value is set to the setting value set in the adjustment mechanism. The radial skew value when the minimum is reached
And a second control means for setting the radial skew adjustment mechanism as a set value.

Therefore, according to the present invention, when the optical disk is mounted, the first set value which is the radial skew that minimizes the jitter value in the mounted optical disk is set, and whether the jitter value is within the allowable range is determined. Is measured, and if the jitter value is within the allowable range, the reproducing operation is performed with the same radial skew. If the jitter value exceeds the allowable range, the radial skew at which the jitter value is minimized is obtained.
Set as a set value. Therefore, every time the optical pickup is sought in the radial direction of the optical disc,
Since it is not necessary to search for the bottom value of the jitter value, it is possible to secure a radial skew margin and shorten the access time of the pickup.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an optical disk device according to the present invention, FIG. 2 is a circuit diagram of a jitter measuring circuit, and FIG. 3 is a signal diagram of the jitter measuring circuit.

First, the configuration of the optical disk device according to the present embodiment will be described with reference to FIG. Optical disk drive 1
000 is a main chassis 10, a sub chassis 20, a pickup carriage 30, a pickup 40, a skew sensor 50, a spindle motor 60, a skew motor 70, a cam 80, a pin 90, a jitter detection circuit 100, a read processor 200, a DSP (Digital Si).
general processor) 300, driver 40
0, a storage unit 500 and the like.

The main chassis 10 includes the optical disk device 1
000, which is fixed to the bottom wall of an unillustrated housing, for example, has a rectangular plate-shaped bottom wall 10A. A spindle motor 60 for rotating and driving the optical disc 1 is attached to the bottom wall 10A of the main chassis 10. Spindle motor 6
Numeral 0 indicates that the rotary drive shaft 62 is disposed with its axis directed vertically upward to the bottom wall 10A. The optical disc 1
The rotary drive shaft 62 of the spindle motor 60 is configured to be detachably mounted on the rotary drive shaft 62, and is rotatably driven about the rotary drive shaft while mounted on the rotary drive shaft 62.

The sub-chassis 20 has a plate shape having a length, a width and a thickness. The length direction of the sub-chassis 20 is lower than the lower surface of the optical disk 1, that is, below the recording surface 1A. It is arranged so as to be parallel to the radial direction. Shafts 24 protrude outward in the width direction from left and right side walls 22 in the width direction of the sub-chassis 20, and each shaft 24 is rotatable by the bearing 12 erected from the bottom wall 10 </ b> A of the main chassis 10. It is supported by. Therefore, the sub-chassis 20 is configured to be rotatable about the shaft portion 24. The pickup carriage 30 is mounted on the sub-chassis 2
The optical disc 1 is provided so as to be slidable in the radial direction of the optical disc 1 with respect to the upper wall 26 and immovable in the circumferential direction of the disc 1.

Pickup 40 and skew sensor 50
Is provided integrally with the pickup carriage 30 at a portion of the pickup carriage 30 facing the recording surface 1A of the optical disk 1. This pickup carriage 30
Is moved in the radial direction (seek direction) by a driving means (not shown). The pickup 40 is configured to read a pit provided on the recording surface 1A of the optical disc 1 and output a reproduction signal S1. The skew sensor 50 incorporates one light emitting element and two light receiving elements (both not shown), irradiates the recording surface 1A of the optical disc 1 with light from the light emitting element, and reflects the light reflected by the recording surface 1A. Are received by two light receiving elements and output as voltage signals A and B, respectively. These two voltage signals A and B are input to a read processor 200 described later, and a radial skew described later is measured.

The skew motor 70 is connected to the main chassis 1
The bottom wall 10A of the sub-chassis 20 is provided at a position close to the outside of the side wall 28 opposite to the spindle motor 60 in the longitudinal direction of the sub-chassis 20. The skew motor 70 has a drive shaft (not shown) orthogonal to a plane including the axis of the shaft portion 24 of the sub-chassis 20 and a side wall 28 of the sub-chassis 20.
Is fixed to the bottom wall 10 </ b> A of the main chassis 10. A cam 80 is connected to the drive shaft so as to engage with a pin 90 projecting from the side wall 28.

Then, the skew motor 70 is driven to rotate, and the cam 90 is rotated to move the pin 90 in the vertical direction.
It is configured to be rotated (oscillated) up and down around the center 4. That is, the rotation of the skew motor 70 causes the optical axis 42 of the pickup 40 to be inclined with respect to the recording surface 1A of the optical disc 1 in the radial direction of the optical disc 1,
That is, the radial skew is adjusted. The skew motor 70 is constituted by, for example, a step motor, and its rotation amount is controlled as described later. Further, such a mechanism for adjusting the radial skew can be realized by appropriately combining conventionally known mechanisms, and does not directly relate to the gist of the present invention.

The jitter detection circuit 100 includes a pickup 4
The jitter value is detected from the RF signal output from 0, and the detected jitter value is input to the DSP 300. The configuration of the jitter detection circuit 100 will be described later.

The read processor 200 detects the difference between the voltage signals A and B input from the skew sensor 50 by Err.
An OR signal (hereinafter referred to as an E signal) and a Sum signal (hereinafter referred to as an S signal) which is the sum of the voltage signals A and B are generated and input to the DSP 300.

The DSP 300 has a function of calculating a radial skew based on the E signal and the S signal, and a driver 40.
0 to the skew motor 7
It has a function of controlling the rotation of zero. Driver 4
Reference numeral 00 denotes a configuration in which drive signals A1, A2, B1, and B2 are generated based on control signals D1 to D4 input from the DSP 300 and input to the skew motor 70, thereby rotating the skew motor 70. . The storage unit 500 stores a first setting value, described later, corresponding to the type of the optical disc in, for example, a table format, among the radial skew data of the type of the optical disc that can be reproduced by the optical disc apparatus 1000. Data can be written and rewritten. In this example, the storage unit 500 is configured by, for example, a flash memory or the like in which stored contents are not volatilized even when the power of the optical disk device is turned off. Note that, among the radial skew data, a second set value, which will be described later, is stored in a volatile memory (not shown) in which data can be written or rewritten by the DSP 300 (storage contents are cleared when the power of the optical disk device is turned off). It is stored.

Next, referring to FIG.
0 will be described. The jitter detection circuit 100
Read processor 110, channel processor 12
0, a shaping circuit 130 and the like. The channel processor 120 includes a binarization circuit 121, a PLL circuit 1
22, a D-type flip-flop 123, an XOR gate (exclusive OR gate) 124, a buffer (enable tri-state CMOS buffer) 125, and the like.

The read processor 110 receives the RF signal S1 input from the pickup 40 and performs a shaping process. The binarization circuit 121 converts the RF signal S1 input from the read processor 110 into a binary RF signal S2. Convert and output. The PLL circuit 122 outputs the binarized RF signal S
2 to generate a PLCK signal S3. The D-type flip-flop 123 receives the binarized RF signal S2 from the D input terminal and the PLCK signal S3 from the clock terminal to generate an output signal Q. That is, an output signal Q that holds the binarized RF signal S2 at the rising edge of the PLCK signal S3 is output.

The XOR gate 124 outputs the binary RF signal S
2 and the output signal Q, and inverts the output signal S4 via an inverter and outputs the inverted signal as an output signal S4 bar. The buffer 125 inputs the inverted output signal S4 as a gate signal, and inputs the PLCK signal as an input signal.
Therefore, the output signal S4 bar becomes “H” (output signal S4
When the bar is "L", the output terminal is open (open), and when the output signal S4 is "L" (the output signal S4 is "H"), the input signal S3 (PLCK signal) is output through. Is done. The output signal of this buffer 125 is
EO signal.

The shaping circuit 130 includes a low-pass filter including a capacitor C1 and a resistor R2, an operational amplifier 131, and resistors R1, R3, and R4 connected thereto.
And an amplifier circuit composed of The operational amplifier 131 is a single power supply (AVDD), its inverting input terminal is connected to a voltage AVDD / 2 via a resistor R3, and its non-inverting input terminal is a voltage AVVDD via resistors R2 and R1.
The output terminal is connected to the inverted input terminal via the resistor R4 when connected to DD / 2. An APEO signal is input to the non-inverting input terminal via a resistor R2 forming a low-pass filter. AP passed through the low-pass filter
The EO signal is amplified at an amplification factor of, for example, 100 times by the amplifier circuit, and the jitter detection signal S as an analog signal is amplified.
5 is output. With the jitter detection circuit 100 configured as described above, the binarized RF signal S2 and the PLC
A jitter detection signal S4 having a voltage corresponding to the phase difference with the K signal is generated. Then, the jitter detection signal S4 is converted into a digital value by the DSP 300 and is treated as a jitter value.

Next, referring to FIG.
The operation of 0 will be described in more detail. In FIG. 3, PITS in FIG. 3A indicates pits formed on the recording surface 1A of the optical disc 1. First, an RF signal S1 whose pit is input from the pickup 40 is converted into a binary RF signal S1 via the read processor 110 and the binary circuit 121.
Converted to 2. The PLL circuit 122 is provided with the binary RF
A PLL signal S3 is generated from the signal S2. FIG.
The rising edge of the binary RF signal S2 is the PLCK signal S
3 shows a state of rising quickly with respect to the rising edge of No. 3. FIG. 3 shows a state where the falling edge of the binarized RF signal S2 falls earlier than the rising edge of the PLCK signal S3. FIG. 3 shows binarized RF
This shows a state where the rising edge of the signal rises later than the rising edge of the PLCK signal S3. FIG. 3 shows a state where the falling edge of the binarized RF signal falls later than the rising edge of the PLCK signal S3.

As described above, the PLCK signal S3 and the binarized RF signal S2 are input to the D-type flip-flop 123, and the output signal Q shown in FIG. 3D is obtained. Binary RF signal S
2 and the output signal Q are input to the XOR gate 124 to obtain the output signal S4. That is, the binary RF signal S
2 rises earlier (FIG. 3) and falls earlier (FIG. 3) with respect to the PLCK signal S3.
The output signal S4 of the XOR gate 124 becomes “H” for a time interval from the rising edge and the falling edge of the binarized RF signal S2 to the rising edge of the PLCK signal S3. On the other hand, when the binarized RF signal S2 rises later (FIG. 3) and later (FIG. 3) with respect to the PLCK signal S3, the "PLCK signal S2"
Output of the XOR gate 124 for a time corresponding to a difference between "a time corresponding to one cycle of 3" and "a delay time from a rising edge of the PLCK signal S3 to a rising edge and a falling edge of the binary RF signal S2". The signal S4 becomes "H". The output signal S4 of the XOR gate 124
Output signal S4 bar and the PLCK signal S3
Is input to the buffer 125 so that the APE
An O signal is generated. This APEO signal is output to the shaping circuit 13.
By being input to 0, a binary RF signal S2,
A voltage signal corresponding to the phase difference from the PLCK signal S3 obtained by inputting the binary RF signal S2 to the PLL circuit 122, that is, a jitter detection signal S5 is output.

Next, the operation of the optical disk apparatus 1000 configured as described above will be described. Optical disk drive 1
The adjustment operation before the 000 is shipped as a product and the operation in actual use after the 000 is shipped as a product will be described separately.

FIG. 4 is a flowchart for explaining the adjusting operation before the optical disk device 1000 is shipped as a product. First, the optical disk 1 is mounted on the optical disk device 1000 (S10). The DPS 300 drives the spindle motor 60 to rotate, and the pits on the recording surface 1A are reproduced by the pickup 40 while the jitter detection circuit 1
The resulting jitter value is measured based on 00. And
The skew motor 70 is rotated via the driver 400 to change the radial skew of the pickup 40 and find the bottom value of the radial skew at which the jitter value is minimized. (S12). As described above, the radial skew is detected based on the voltage signals A and B input from the skew sensor 50.

When a radial skew detected by the skew sensor 50 is zero as a reference value, and a difference between the reference value and the bottom value is an offset value, the offset value corresponds to the optical disk 1. 1
It is determined as a set value (S14). Therefore, DS
The P300 stores the first set value in the storage unit 500 in a table format corresponding to the type of the optical disc 1 (S1).
6). Next, the optical disk 1 is moved to the optical disk device 1000.
(S18), and if there is an optical disk of the type whose first set value is undetermined, the process proceeds to S10 to perform the same processing. If there is no optical disk of the type whose first set value is undetermined, the process is terminated (S20). By performing the above processing, the first set values are determined for all types of optical discs that can be reproduced by the optical disc apparatus 1000 and stored in the storage unit 500.

FIG. 5 is a flowchart for explaining the operation when the reproducing operation is performed after the optical disk device 1000 is shipped as a product. First, the optical disk device 100
Optical disk 1 having pits recorded on recording surface 1A at 0
Is attached (S30). The DPS 300 determines the type of the loaded optical disc 1 (S32). The type of the optical disk is determined by, for example, rotating the spindle motor 60, reproducing the pits on the recording surface 1A by the pickup 40, and determining data indicating the type of the optical disk stored in a specific area. It is.
When the type of the optical disc 1 is determined, the first set value corresponding to the type is read from the storage unit 500 (S34).

Then, the read first set value is set as the radial skew of the pickup 40 (S3).
6). That is, the skew motor 70 is rotationally driven such that the radial skew detected by the skew sensor 50 matches the first set value. The spindle motor 60 is driven to rotate, and while the pits on the recording surface 1A are reproduced by the pickup 40, a jitter value obtained based on the jitter detection circuit 100 is measured, and it is determined whether or not the jitter value is within an allowable range. (S38). If the jitter value is within the allowable range, the radial skew is kept at the first set value, and a series of processing is ended to shift to a normal reproduction operation.
On the other hand, if the jitter value exceeds the allowable range,
12, S14 and S16 are substantially the same.

That is, the skew motor 70 is rotated via the driver 400 to change the radial skew of the pickup 40 and find the bottom value of the radial skew at which the jitter value becomes minimum (S40). An offset value, which is a difference between the reference value and the bottom value found this time, is determined as a second set value corresponding to the optical disc 1 (S4).
2). The DSP 300 stores the second set value in the optical disk 1
(S4).
4). Next, since the jitter value has fallen within the allowable range, a series of processes is terminated and the operation shifts to a normal reproducing operation.

According to the optical disk apparatus of the present embodiment described above, when the optical disk is mounted, it is measured whether or not the jitter value is within the allowable range. If the jitter value is within the allowable range, the reproducing operation is performed as it is. If so, adjust the radial skew. Therefore, unlike the conventional case, it is not necessary to search for the bottom value of the jitter value every time the optical pickup is sought in the radial direction of the optical disk. Therefore, a radial skew margin (margin of the jitter value) is secured and the access time of the pickup is reduced. The effect of shortening can be obtained. The effect of reducing the access time becomes more remarkable as the density of the optical disk increases. Further, since the process of adjusting the radial skew by the above-described DSP 300 is not a complicated control process, the amount of coding of the firmware of the DSP 300 can be reduced, and there is an advantage that a DSP having a low processing capability can perform the process. In the present embodiment, DS
Although P is used, a CPU may be used instead of the DSP.

Although the above embodiment has been described assuming that the pickup 40 performs a reproducing operation, the pickup 40 has a function of forming a pit on the recording surface 1A of the optical disk 1 and performing a recording operation. Apparatus 1
Of course, 000 may be configured to perform the reproduction and recording operations. When the pickup is configured to be able to perform a recording operation, the DSP 30
0 (corresponding to the third control means in the claims) is a first set value corresponding to the type of the loaded optical disc when the unrecorded optical disc in which no pit is recorded is loaded into the optical disc apparatus. May be read from the storage section 500 and set, and the recording operation by the pickup may be performed in that state.

The output of the voltage signal of the skew sensor 50 changes due to, for example, a temporal change (deterioration) of the light emitting element. For this reason, the error of the measured value of the radial skew increases along with the operation time of the skew sensor 50 and the optical disk device, and the first set value stored in the storage unit 500 becomes inaccurate. There are also me that let me. Therefore, the DSP 300 (corresponding to the fourth control means in the claims) stores the first data stored in the storage unit 500 each time the skew sensor 50 and the optical disk device operate for a predetermined time (for example, 2000 hours). If the set value updating operation for storing the second set value instead of the set value is performed, there is an advantage that the first set value can always be made accurate in accordance with the aging of the skew sensor 50. By thus making the first set value always accurate, for example, the access time of the pickup can always be shortened, and the recording by the pickup on the unrecorded optical disk is performed in a state where the radial skew is small. Can be obtained. For the measurement of the operation time of the skew sensor 50 and the optical disk device, well-known means such as a timer can be appropriately employed.

Here, the correspondence between the present embodiment and the description in the claims will be described. Main chassis 10, bus chassis 20, skew motor 70, cam 80, DP3
00, the driver 400, and the skew motor 70 correspond to a radial skew adjustment mechanism in the claims. Further, the skew sensor 50 corresponds to a radial skew detecting unit in the claims. The storage unit 500 corresponds to a storage unit in the claims. In addition, DSP30
0 corresponds to the first control means and the second control means in the claims. Further, the pickup carriage 30, the sub-chassis 20, and the main chassis 10 correspond to first, second, and third support members in the claims, respectively.

[0034]

As described above, according to the present invention, the radial skew detecting means for detecting the radial skew and the radial skew which minimizes the jitter value are set in the first setting corresponding to the type of the optical disk which can be reproduced by the optical disk apparatus. Storage means for storing a value as a value, and when an optical disk having pits recorded thereon is mounted on an optical disk apparatus, a first set value corresponding to the type of the mounted optical disk is read from the storage means and transmitted to the radial skew adjustment mechanism. First to set
If the jitter value detected by the jitter detection circuit is within an allowable range in a state where the radial skew has become the first set value by the control means and the radial skew adjustment mechanism, the set value set in the radial skew adjustment mechanism is left as it is. If the jitter exceeds the allowable range, the radial skew adjustment mechanism is controlled so that the jitter value detected by the jitter detection circuit becomes the minimum value, and the radial skew value when the jitter value becomes the minimum is set as the second set value. And a second control means for setting the adjustment mechanism.

Therefore, according to the present invention, when the optical disk is mounted, the first set value, which is the radial skew that minimizes the jitter value in the mounted optical disk, is set, and whether the jitter value is within the allowable range is determined. Is measured, and if the jitter value is within the allowable range, the reproducing operation is performed with the same radial skew. If the jitter value exceeds the allowable range, the radial skew at which the jitter value is minimized is obtained.
Set as a set value. Therefore, every time the optical pickup is sought in the radial direction of the optical disc,
Since it is not necessary to search for the bottom value of the jitter value, it is possible to secure a radial skew margin and shorten the access time of the pickup.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of an optical disk device of the present invention.

FIG. 2 is a circuit diagram of a jitter measuring circuit.

FIG. 3 is a signal diagram of a jitter measuring circuit.

FIG. 4 is a flowchart illustrating an adjustment operation before the optical disk device is shipped as a product.

FIG. 5 is a flowchart illustrating an operation when a reproducing operation is performed after the optical disk device is shipped as a product.

FIG. 6 is a diagram showing a jitter curve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 1A ... Recording surface, 40 ... Pickup, 50 ... Skew sensor, 70 ... Skew motor, 80 ... Cam, 100 ... Jitter detection circuit, 200
…… Read processor, 300 …… DSP, 400 ……
Driver, 500 storage unit, 1000 optical disk device.

Claims (9)

[Claims] 1. A pickup for reading a pit recorded on a recording surface of a rotationally driven optical disk and outputting a reproduction signal, a jitter detection circuit for detecting a jitter value of the reproduction signal, and a set radial skew. An optical disc device having a radial skew adjustment mechanism for adjusting the tilt of the pickup as described above, comprising: a radial skew detecting means for detecting the radial skew; and an optical disc capable of reproducing the radial skew with the minimum jitter value by the optical disc device. Storage means for storing as a first set value in accordance with the type of the optical disk; and when the optical disk in which pits are recorded is mounted in the optical disk device, the first means corresponding to the type of the mounted optical disk Reading a set value from the storage means and setting the radial skew adjuster The first skew control means for setting the radial skew adjustment mechanism to the radial skew adjustment mechanism if the jitter value detected by the jitter detection circuit is within an allowable range with the radial skew at the first set value. If the set value is kept as it is, and if the jitter value exceeds the allowable range, the radial skew adjustment mechanism is controlled so that the jitter value detected by the jitter detection circuit becomes a minimum value, and the jitter value is minimized. And a second control means for setting a radial skew value at the time of setting as a second set value in the radial skew adjustment mechanism. 2. The optical pickup according to claim 1, wherein said optical pickup is configured to perform a recording operation for recording a pit based on a recording signal on a recording surface of a rotationally driven optical disk. When the optical disk is mounted on the apparatus, the first set value corresponding to the type of the mounted optical disk is read from the storage unit and set in the radial skew adjustment mechanism, and in that state, the recording operation by the optical pickup is performed. 2. The optical disk device according to claim 1, further comprising a third control unit for performing the operation. 3. The storage means is configured not to volatilize when the power of the optical disk device is turned off and to be rewritable,
2. The optical disk device according to claim 1, further comprising a fourth control unit that performs a set value updating operation for storing the second set value in the storage unit instead of the first set value. 4. The apparatus according to claim 1, wherein the setting value updating operation by the fourth control means is executed every time when the radial skew detecting means or the optical disk apparatus has been operated for a predetermined time. The optical disk device according to claim 3. 5. The optical disk apparatus according to claim 1, wherein the radial skew is an inclination of an optical axis of the optical system of the pickup with respect to the recording surface in a radial direction of the optical disk. 6. A first support member to which the pickup is attached, a second support member for supporting the first support member so as to be slidable in the radial direction, and the optical axis of an optical system of the pickup. 2. The optical disk drive according to claim 1, further comprising: a third support member rotatably supporting the second support member in a plane including a rotation center axis of the optical disc such that a tilt with respect to a recording surface changes. Optical disk device. 7. The optical disk device according to claim 6, wherein the radial skew adjustment mechanism is configured to rotate the second support member. 8. The skew detection means according to claim 6, wherein said skew detection means is attached to said first support member and detects an inclination of said first support member with respect to a recording surface of said optical disc as said radial skew. Optical disk device. 9. A radial skew detected by said radial skew detecting means being a reference value, wherein a radial skew detected by said radial skew detecting means is a reference value, and a radial skew detected by said jitter detecting circuit is a minimum value. 2. The optical disk device according to claim 1, wherein when the values are set as values, an offset value that is a difference between the reference value and the bottom value is set as the first set value and the second set value.