JP2002279666A - Optical disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk driving device in which access speed is accelerated by dispensing with tilt correction time in seek. SOLUTION: A CPU 205 enables a control signal b when recording data. As a result, a radial tilt error signal detected by a tilt sensor 201 is supplied to a radial tilt correcting mechanism to adjust the tilt of an optical pickup arising from the tilt of an optical disk. The CPU disables the control signal b when reproducing the data. As a result, the radial tilt correcting mechanism is not driven. Since radial tilt correction is not carried out in reproduction of data, time to carry out tilt correction is unnecessary in seek, thereby the access speed is accelerated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk drive provided with a means for correcting radial tilt.

[0002]

2. Description of the Related Art In an optical disk driving apparatus, there is a problem that a beam is not irradiated perpendicularly to an optical disk from a pickup due to a warp of a disk, an assembly error of a spindle motor, and the like. In such a state, the characteristics of the optical system of the optical pickup deteriorate, and it becomes impossible to perform accurate data recording and reproduction. In order to solve such a problem, in the technology described in JP-A-6-295458,
In order to correct the tilt (radial tilt) in the radial direction of the disk, the radial tilt is corrected using a tilt mechanism (see FIG. 5 in the above publication). Therefore, data can be recorded and reproduced with high accuracy.

[0003]

As in the optical disk drive described in the above-mentioned publication, the data can be read with high accuracy by performing the radial tilt correction even when the data is reproduced. However, if the radial tilt correction is performed at the time of reproduction, there are the following problems. 1. When trying to perform tilt correction at the time of seeking with the optical disc drive described in the above publication, a mechanical tilt has a very large mechanical time constant.
The time for tilt correction itself becomes longer. Also, when reading data at the target address, the pickup is moved to the vicinity of the target address, and then tilt correction is performed. Therefore, compared to a device that does not perform tilt correction, the seek time is equal to the time during which tilt correction is performed. become longer. 2. Mechanical Vibration Problem Since the tilt correction mechanism has a structure in which a mechanical mechanism that moves on a fulcrum is supported at one point, it has a structure that is less susceptible to vibration than an apparatus that does not have a tilt correction mechanism. Therefore, the spindle motor cannot be rotated at high speed, and high-speed data cannot be read. In the case of an optical disk that can be played back only by performing radial tilt correction, it is worthwhile to perform radial tilt correction, but the optical disk has very small warpage and plays back a disk that can be played without radial tilt correction In such a case, it appears to the user that only the access speed is slow. An object of the present invention is to provide an optical disk drive that can solve these problems.

[0004]

In order to achieve the above object, an invention according to claim 1 of the present application is directed to an optical disk drive device provided with a means for performing a radial tilt correction. In addition, it is characterized in that radial tilt correction is not performed during reproduction. According to a second aspect of the present invention, there is provided an optical disk drive device having a means for performing a radial tilt correction, wherein a radial tilt correction is performed at the time of data recording, and a radial tilt correction mechanism is locked at the time of reproduction to perform no radial tilt correction. It is characterized by having such a configuration. According to a third aspect of the present invention, there is provided an optical disk drive device having a means for performing radial tilt correction, wherein radial tilt correction is performed during data recording, radial tilt correction is performed before reproduction, and radial tilt correction is performed before reproduction. The tilt correction mechanism is configured to be locked at the position where the tilt correction is performed. According to a fourth aspect of the present invention, in the optical disk drive according to the third aspect, the position at which the tilt correction is performed before reproduction is substantially near the center of the disk. According to a fifth aspect of the present invention, in the optical disk drive according to the third aspect,
It is characterized in that the position for performing tilt correction before reproduction can be set arbitrarily. According to a sixth aspect of the present invention, in the optical disk drive according to any one of the first to fifth aspects, when normal reproduction cannot be performed when data is reproduced without performing the radial tilt correction, the radial tilt correction is performed. It is characterized in that it is configured to do so. According to a seventh aspect of the present invention, in the optical disk drive device according to any one of the first to sixth aspects, it is characterized in that it is possible to select whether or not to perform radial tilt correction.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a main part side view showing an example of an embodiment of an optical disk drive according to the present invention. In the figure, 101 is an optical disk, 102 is an optical disk 1
Reference numeral 103 denotes an optical pickup, 104 denotes a seek rail, 105 denotes a radial tilt mechanism, and 106 denotes a chassis. Spindle motor 1
02 and the radial tilt mechanism 105 are fixed to the chassis 106. The radial tilt mechanism 105 can tilt the seek rail 104 with respect to the chassis 106 in the direction indicated by the arrow A, and as a result, the optical pickup 103 can adjust the angle with respect to the optical disc 101. . FIG. 2 is a functional block diagram of a processing system for detecting a radial tilt signal and processing the signal. In the figure, reference numeral 201 denotes a tilt sensor mounted on the optical pickup 103, which detects a radial tilt between the optical disc 101 and the optical pickup 103. 20
Reference numeral 2 denotes a first signal processing circuit that performs amplification, calculation, and the like of a signal detected by the tilt sensor 201, and outputs a voltage proportional to the amount of radial tilt. Reference numeral 203 denotes a second signal processing circuit that performs appropriate processing on the output of the first signal processing circuit 202 and outputs the result to the driver 204. The driver 204 inputs the signal a to the radial tilt mechanism shown in FIG. 1 according to the input signal. The radial tilt mechanism 105 tilts the seek rail 104 in accordance with the signal a so that the optical pickup 103 and the optical disc 1 are tilted.
01 is adjusted so as to be 90 degrees. Here, the output of the driver 204 can be disabled by a signal b output from the CPU (control unit) 205.

In this configuration, the CPU 205 enables the control signal (b) when recording data. As a result, the radial tilt error signal detected by the tilt sensor is supplied to the radial tilt mechanism after signal processing, so that the tilt of the optical pickup 104 is adjusted with the tilt of the optical disc 101. The control unit 207 disables the control signal (b) when reproducing data. As a result, the radial tilt correction mechanism 105 is not driven, and the optical pickup 103 remains stationary with respect to the chassis 106 regardless of the tilt of the optical disk 101. As a result, the radial tilt correction is performed at the time of data recording, so that data can be recorded with high accuracy.Also, at the time of data reproduction, the radial tilt mechanism is stopped and the radial tilt correction is not performed, so that the seek operation is not performed. In some cases, the time for performing the tilt correction is not required, so that the access speed is increased. (Claim 1)

FIG. 3 is a side view of a main part showing another embodiment of the optical disk drive according to the present invention. As shown in FIG. 3, a support mechanism 301 for locking the radial tilt correction mechanism is provided on the chassis 106, and when the data is reproduced without performing the radial tilt correction, the radial tilt correction mechanism is locked. The tilt mechanism 105 is more resistant to vibration than when the tilt mechanism is not locked, so that even if the spindle motor 102 is rotated at a high speed, the tilt mechanism 105 and the seek rail 104 that support the optical pickup 101 are less affected by the vibration. Therefore, high-speed reading of data can be performed. When the radial tilt correction is performed, the lock of the radial tilt mechanism is released by moving the support mechanism 301 in the direction of arrow B and disposing the support mechanism 301 at the position shown by the dotted line. (Claim 2) For example, as shown in FIG.
When the optical disc 101 is mounted obliquely with respect to the pickup 103, the radial tilt has an offset as shown in FIG. Since this offset value can be removed by correcting the radial tilt once, the radial tilt is corrected once when the optical disc 101 is inserted, and then the radial tilt correcting mechanism is operated in a state where the radial tilt is corrected. By locking, an offset-type radial tilt due to a mechanical assembly error can be removed. (Claim 3) For example, by performing radial tilt correction once at the innermost circumference when the optical disk 101 is inserted, offset-type radial tilt due to a mechanical assembly error is corrected based on the innermost circumference, After that, only the radial tilt due to the warpage of the disk with respect to the innermost circumference remains. As described above, by performing the radial tilt correction at one point of the optical disk when the optical disk is inserted, the offset-type radial tilt can be corrected. In addition, the position of the radial tilt when the radial tilt correction is performed once before the reproduction is generally performed in the radial tilt state of the optical disc, as shown in FIG. If the distance is near, it is possible to correct an almost average offset radial tilt of the optical disk.

More specifically, in the case of an optical disc having the characteristics shown in FIG. 6, when radial tilt correction before reproduction is performed at the innermost circumference, the radial tilt becomes the largest at the outermost circumference at T3. However, when radial tilt correction is performed at a radial position near the middle circumference, the radial tilt becomes the largest at the innermost circumference T1 or the outermost circumference T2, and T1 and T2 are T3.
Smaller than the absolute value. Therefore, the maximum value of the radial tilt of the optical disk can be reduced by performing the radial tilt correction in advance near the middle circumference rather than the innermost circumference. (Claim 4) In a general optical disc, the maximum value of the radial tilt can be reduced by a method of performing a radial tilt correction in the vicinity of the middle circumference in advance. There is a case where the maximum value of the radial tilt can be reduced by performing at the position of. Such a case can be dealt with by allowing the user to specify in advance the position where the radial tilt correction is to be performed. (Claim 5) Further, in the case of an optical disk having a large warp and a large radial tilt, data may not be read even after retrying a certain number of times in a state where the radial tilt correction is not performed. In the case of an optical disk from which data cannot be read even after performing a certain number of retries, data is read even if the optical disk has a large warpage and poor radial tilt characteristics by performing radial tilt correction. Will be able to do it. (Claim 6) In some cases, depending on the user's request, it is conceivable to give priority to read accuracy over access speed. This can be solved by allowing the user to set whether or not to perform radial tilt correction. (Claim 7)

[0009]

As described above, the present invention has the following effects. In the optical disk drive device according to the first aspect, since the radial tilt correction is not performed at the time of data reproduction, the time for performing the tilt correction at the time of seeking is not required, and the access speed is increased. According to the optical disk drive device of the present invention, the radial tilt correction mechanism is locked, so that the optical disk drive device is more resistant to vibration than when the lock is not locked, so that the pickup is supported even when the spindle is rotated at a high speed. The chassis is less susceptible to vibration. Therefore, high-speed reading of data can be performed stably. According to the optical disk drive device of the third aspect, the radial tilt correction mechanism is locked after performing the radial tilt correction at one point of the optical disk. Therefore, the optical disk drive device has the same effect as the optical disk drive device of the second aspect, Further, the mounting error of the radial tilt correction mechanism of the drive can be corrected. In the optical disk drive according to the fourth aspect, the radial tilt correction mechanism is locked after performing the radial tilt correction substantially near the middle circumference of the optical disk, so that the same effect as the optical disk drive according to the third aspect is provided. In addition, the average radial tilt of the optical disk can be corrected.

In the optical disk drive according to the fifth aspect, the user can specify at which radial position the radial tilt correction performed when an optical disk is inserted is performed, so that the same effect as the optical disk drive according to the third aspect is provided. In addition, it is possible to cope with an optical disk having a special sled shape. In the optical disk drive according to the present invention, since the radial tilt correction is performed by unlocking the disk for which normal reading cannot be performed in a state where the tilt correction mechanism is locked, the optical disk driving device according to the present invention is applied to an ordinary disk. The same effects as those of the optical disk drive described in the above items 5 to 5, and even if the disk has poor radial tilt characteristics, it can be reproduced. The optical disk drive according to the seventh aspect has the same effect as the optical disk drive according to the first to sixth aspects, since the user can set whether or not to perform the radial tilt correction. If priority is given to reading accuracy over speed, it can be dealt with by setting a mode in which radial tilt correction is performed.

[Brief description of the drawings]

FIG. 1 is a main part side view showing an example of an embodiment of an optical disk drive according to the present invention.

FIG. 2 is a functional block diagram of a processing system for detecting a radial tilt signal and processing the signal.

FIG. 3 is a main part side view showing another embodiment of the optical disk drive according to the present invention.

FIG. 4 is an explanatory diagram showing that the radial tilt has an offset value when the spindle motor is mounted obliquely with respect to the pickup.

FIG. 5 is an explanatory diagram of a radial tilt correction position.

FIG. 6 is an explanatory diagram illustrating a radial tilt characteristic of an optical disc.

[Explanation of symbols]

 101: optical disk 102: spindle motor 103: optical pickup 104: seek rail 105: radial tilt mechanism 106: chassis 201: tilt sensor 202: first signal processing circuit 203: second signal processing circuit 204: driver 205: CPU 301 ： Support mechanism (locking means)

Claims (7)

[Claims] 1. An optical disk drive device comprising a means for performing radial tilt correction, wherein the optical disk drive device is configured to perform radial tilt correction during data recording and not perform radial tilt correction during reproduction. 2. An optical disk drive device having a means for performing radial tilt correction, wherein a radial tilt correction is performed when data is recorded, and the radial tilt correction mechanism is locked during reproduction so that the radial tilt correction is not performed. An optical disk drive characterized by the above-mentioned. 3. An optical disk drive device provided with a means for performing radial tilt correction, wherein a radial tilt correction is performed at the time of recording data, a radial tilt correction is performed before reproduction, and a radial tilt correction is performed at a position at the time of reproduction. An optical disk drive, wherein the tilt correction mechanism is configured to be locked. 4. The optical disk drive according to claim 3, wherein the position at which tilt correction is performed before reproduction is substantially near the center of the disk. 5. The optical disk drive according to claim 3, wherein a position for performing tilt correction before reproduction can be arbitrarily set. 6. The apparatus according to claim 1, wherein when the data is reproduced without performing the radial tilt correction, when the normal reproduction cannot be performed, the radial tilt correction is performed. Optical disk drive. 7. The optical disk drive according to claim 1, wherein it is possible to select whether or not to perform radial tilt correction.