JPH0935285A - Optical disk vibration suppression control device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an optical disk vibration damping control device with improved seismic performance and easy realization. [Structure] When recording or reading information on an optical disk 16, an actuator 1 for moving a focus position where information can be recorded and read in a tracking direction or a focus direction, and an optical disk 16 including this actuator 1
The optical pickup 2 which is a component for detecting the above information, and a horizontal sensitivity axis acceleration sensor 36 which has a sensitivity axis in a direction 50 parallel to the mounting surface and a sensitivity axis in a direction 50 parallel to the tracking direction. A tilt sensitivity axis acceleration sensor 35, which is an acceleration sensor having a sensitivity axis in directions 51 other than parallel and perpendicular to the mounting surface, an acceleration 52 of a tracking direction component, and an acceleration 5 of a focus direction component.
Inclination sensitivity axis acceleration sensor 35 composed of 3
It consists of 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc whose focal position is a target by detecting the vibration acceleration due to external vibration by an acceleration sensor in advance when recording or reading information on the optical disc under vibration. The present invention relates to an optical disk vibration damping control device that follows an upper record readable position.

[0002]

2. Description of the Related Art FIG. 6 shows the configuration of a conventional optical disk device. This conventional optical disk device is an actuator 1 for moving a focus position in a tracking direction which is a radial direction of an optical disk or a focus direction which is a direction perpendicular to an optical disk surface, and a component which detects information on the optical disk including the actuator 1. Optical pickup 2
An actuator driving device 4 for outputting a driving current 3 for driving the actuator 1, an error signal 5 indicating a positional deviation amount between a focus position and a recordable / readable position on the optical disc in a tracking direction or a focus direction, and an error signal. A servo device 7 which outputs an actuator drive signal 6 which is a drive voltage for driving the actuator 1 so that the focus position follows the recordable and readable position on the optical disc where the focal position can record or read information on the optical disc. , An acceleration sensor 9 for detecting a vibration acceleration 8 applied to the optical disk device from the outside, an amplifier filter 11 for determining a gain and a frequency characteristic of an acceleration detection signal 10 detected by the acceleration sensor 9, and a gain and a frequency required by the amplifier filter 11. Accelerometer output signal 12 with characteristics and An adder 13 for adding the acceleration sensor output signal 12 to the actuator drive output signal 6 and outputting it to the actuator drive device 4, a spindle motor 15 for rotating the optical disc 16, and a traverse motor for moving the optical pickup 2 in the radial direction of the optical disc. 1
7 is provided.

Next, the operation of the above conventional example will be described. The optical disc 16 is rotated by the spindle motor 15 and the pickup 2 is driven by the traverse motor 17 in order to move the focus position to the vicinity of a track where desired information can be recorded or read. Further, since the focus position follows the recordable / readable position on the optical disc, the actuator drive signal 6 is output by the servo device 7 so that the error signal 5 is reduced.

Further, the vibration acceleration 8 applied to the optical disk device from the outside is detected by the acceleration sensor 9, and the acceleration sensor output signal 12 having necessary gain and frequency characteristics by the amplifier filter 11 is used as the actuator drive signal 6. The addition is performed by the addition device 13 and output to the actuator drive device 4. The actuator drive device 4 outputs a drive current 3 for the actuator to output the actuator 1
Drive.

As described above, in the above-mentioned conventional optical disk device, the acceleration sensor 9 detects the acceleration sensor 9 and drives the actuator 1 by adding the acceleration sensor output signal 12 having the gain and frequency characteristics and the actuator driving signal 6, thereby shortening the time. Even if a periodic vibration acceleration is applied, the focus position is made to follow the target recordable and readable position on the optical disk to record or read on the optical disk 16.

[0006]

However, in the above-mentioned conventional optical disk device, the vibration acceleration in the tracking direction, which is the optical disk radial direction in which the vibration resistance of the optical disk device is required, and the focus direction, which is the direction perpendicular to the optical disk surface, are detected. In order to do so, use a bidirectional acceleration sensor, detect by changing the angle of the mounting surface on which the acceleration sensor is mounted, or in a direction including the acceleration component in the tracking direction and focus direction other than parallel and perpendicular to the mounting surface. It was necessary to calculate the acceleration sensor output signal by two tilt sensitivity axis acceleration sensors having a sensitivity axis in the direction of.

It is difficult in terms of cost and design to use a bidirectional accelerometer or to design a substrate on which the accelerometer is mounted by tilting, and it is effective to calculate an accelerometer output signal by two tilt sensitive axis accelerometers. It was a means. However, by performing such a calculation, the errors of the two tilt-sensitive axis acceleration sensors are mixed, and the acceleration detection accuracy in the tracking direction, which requires high-level focus position control, is not good.

Further, in the above-mentioned conventional optical disc apparatus, a spindle motor 15 for rotating the optical disc 16 or an access motor 17 for moving the optical pickup 2, which is a component for detecting information on the optical disc 16 including an actuator, is provided near the access motor 17. Since it is necessary to attach the acceleration sensor 9, generation of electrical or magnetic noise peculiar to the optical disk device cannot be avoided.

Therefore, it has been necessary to take measures to reduce the generation of noise itself by changing the characteristics of the motor or to eliminate the noise by a filter circuit.

Further, in the above-mentioned conventional optical disk device, when the acceleration sensor fails and acceleration cannot be detected, there is a problem that vibration resistance is significantly deteriorated.

Further, in the above-mentioned conventional optical disk device, when the initial sensitivity error of the acceleration sensor alone, the detection sensitivity fluctuation due to the temperature fluctuation of the acceleration sensor, the sensitivity error generated in the actuator, or the sensitivity characteristic of the acceleration sensor deteriorates with time, The deterioration led to deterioration of the vibration resistance.

The present invention solves the above problems, and an object of the present invention is to provide an optical disk vibration damping control apparatus which has improved vibration resistance performance, is easy to realize, and is highly reliable.

[0013]

In order to achieve the above object, an optical disk vibration damping control apparatus according to the invention of claim 1 is a focal position capable of recording and reading information when recording or reading information on an optical disk. An actuator tracking direction drive device that moves an actuator that moves in the tracking direction that is the radial direction of the optical disc, or an actuator focus direction drive device that moves the actuator in the focus direction that is a direction perpendicular to the optical disc surface, and a focus position and a recordable / readable position on the optical disc. Servo device that outputs an actuator drive signal that is a voltage signal that drives the actuator so as to reduce the error signal that indicates the amount of positional deviation in the tracking direction or focus direction, and the horizontal sensitivity that has a sensitivity axis in the direction parallel to the mounting surface. Axial acceleration sensor and mounting surface By arranging the tilt sensitivity axis acceleration sensor having sensitivity axes in directions other than parallel and vertical and the sensitivity axis of the horizontal sensitivity axis acceleration sensor so as to match the tracking direction, the tracking direction which is the acceleration in the tracking direction. By arranging the means for detecting the acceleration signal and the tilt sensitivity axis acceleration sensor so as to have the sensitivity axis in the direction including the tracking direction and the focus acceleration component, the tilt direction which is the acceleration including the acceleration in the tracking direction and the acceleration in the focus direction. A means for detecting the acceleration signal, a means for calculating a focus direction acceleration signal which is an acceleration in the focus direction by calculating a difference or a sum of the tracking direction acceleration signal and the tilt direction acceleration signal, and a tracking direction acceleration signal or a focus direction acceleration. Signal to each Characterized by comprising a means for adding the Yueta drive signal.

In order to achieve the above object, an optical disk vibration damping control device according to a second aspect of the present invention comprises:
In the optical disk vibration damping control device described above, an acceleration sensor having a sensitivity axis in a direction parallel to the mounting surface, a direction perpendicular to the mounting surface, or a direction other than that, and a noise removing device that surrounds all or part of a circuit for operating the acceleration sensor. And a shield material.

In order to achieve the above object, an optical disk vibration damping control device according to a third aspect of the present invention comprises:
In the optical disk vibration damping control device described above, an optical pickup including an acceleration sensor having a sensitivity axis in a direction parallel to the mounting surface, a direction perpendicular to the mounting surface, or a direction other than the mounting direction, and an optical pickup that is a component for detecting information on the optical disk It is characterized in that it is provided with means for vibrating the acceleration sensor by moving in the radial direction, and means for confirming that the acceleration sensor can normally detect the vibration.

In order to achieve the above object, an optical disk vibration damping control device according to a fourth aspect of the present invention is the third aspect.
In the optical disk vibration damping control device described above, an optical pickup including an acceleration sensor having a sensitivity axis in a direction parallel to the mounting surface, a direction perpendicular to the mounting surface, or a direction other than the mounting direction, and an optical pickup that is a component for detecting information on the optical disk A means for vibrating the acceleration sensor by moving in the radial direction and a means for adjusting the gain of the acceleration sensor according to the level of the acceleration signal output from the acceleration sensor generated by moving the optical pickup are provided. And

[0017]

According to the present invention, the horizontal sensitivity axis acceleration sensor detects the tracking direction acceleration signal which is the acceleration in the tracking direction, and the tilt sensitivity axis acceleration sensor includes the tracking direction acceleration and the focus direction acceleration. The tilt direction acceleration signal which is the normal acceleration is detected, and the focus direction acceleration signal is calculated by addition and subtraction with the tracking direction acceleration signal. The tracking direction acceleration signal and the focus direction acceleration signal are added to a servo loop for controlling the actuator.

According to the second aspect of the invention, the noise component peculiar to the optical disk device is removed by using the acceleration sensor alone or the shield material surrounding the whole or part of the acceleration sensor and the circuit for operating the acceleration sensor. be able to.

According to the third aspect of the invention, the acceleration sensor is vibrated by moving the optical pickup which is a component for detecting information on the optical disk including the actuator, and the acceleration output signal causes the acceleration sensor to operate normally. Check whether the acceleration can be detected, and if abnormal, take another anti-vibration measure or notify the user of the failure.

According to the invention of claim 4, the acceleration sensor is vibrated by moving the optical pickup which is a component for detecting information on the optical disk including the actuator, and the acceleration output signal at that time causes the acceleration sensor to vibrate. It adjusts the gain.

[0021]

【Example】

(First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings.

The suspension chassis 6 shown in FIG.
A spindle motor 15 and an optical disk 16 which is a recording medium rotatably driven by the spindle motor 15 are provided on the suspension chassis 61, and the optical pickup 2 and the optical pickup 2 are provided on the suspension chassis 61. A traverse motor 17 for moving the optical disc 16 in the tracking direction, which is the radial direction, is provided, and the optical pickup 2 includes an actuator 1. Further, on the suspension chassis 61, a tilt sensitivity axis acceleration sensor 35 and a horizontal sensitivity axis acceleration sensor 36 are provided.

When the actuator 1 records or reads information on the optical disk 16, it moves a focal position where information can be recorded and read in a tracking direction which is a radial direction of the optical disk or a focus direction which is a direction perpendicular to the optical disk surface. Is a movable part of. The optical pickup 2 is a component that detects information on the optical disc 16 including the actuator 1.

The tilt sensitivity axis acceleration sensor 35 is an acceleration sensor having a sensitivity axis in a direction 51 other than parallel and perpendicular to the mounting surface, and the acceleration in the sensitivity axis direction 51 is the acceleration 52 of the tracking direction component. It consists of the acceleration 53 of the focus direction component. The horizontal sensitivity axis acceleration sensor 36 is an acceleration sensor having a sensitivity axis in a direction 50 parallel to the mounting surface, and is arranged so as to have a sensitivity axis in a direction 50 parallel to the tracking direction.

As shown in FIG. 2, the tracking error signal 21 output from the actuator 1 is a signal indicating the amount of positional deviation in the tracking direction between the focus position and the recordable / readable position on the optical disk. The focus error signal 31 output from the actuator 1 is a signal indicating the amount of positional deviation in the focus direction between the focus position and the recordable / readable position on the optical disk.

The servo device 7 outputs an actuator drive signal 6 which is a voltage signal for driving the actuator 1 so that the focal position follows the recordable / readable position on the optical disk.

The acceleration detection signal 10 output from the tilt sensitivity axis acceleration sensor 35 and the horizontal sensitivity axis acceleration sensor 36 is the vibration acceleration on the optical disk device detected by the tilt degree axis acceleration sensor 35 or the horizontal sensitivity axis acceleration sensor 36. is there.

The amplifier filter 11 uses the acceleration detection signal 10
For outputting the tracking direction acceleration signal 41 or the tilt sensitivity axis acceleration signal 42 having the necessary gain and frequency characteristics.

The tracking addition device 22 adds the tracking direction acceleration signal 41 to the actuator drive signal 6. The arithmetic unit 34 calculates the focus direction acceleration signal 43 which is the acceleration in the focus direction by adding or subtracting the tilt sensitivity axis acceleration signal 42 and the tracking direction acceleration signal 41.

The focus adder 32 adds the focus direction acceleration signal 43 to the actuator drive signal 6. Further, the actuator tracking direction driving device 23 uses the tracking addition device 22 to convert the actuator driving signal 6 into the tracking direction acceleration signal 4
The signal obtained by adding 1 is converted into the actuator tracking direction drive current 20. Further, the actuator focus direction driving device 33 is the focus adding device 3
2, the signal obtained by adding the focus direction acceleration signal 43 to the actuator drive signal 6 is converted into the actuator focus direction drive current 30.

Next, the operation of the first embodiment will be described.
As shown in FIG. 2, the servo drive 7 outputs the actuator drive signal 6 so that the tracking error signal 21 or the focus error signal 31 becomes smaller. Further, the horizontal sensitivity axis acceleration sensor 36 is arranged such that the sensitivity axis 50 of the horizontal sensitivity axis acceleration sensor 36 is in a position parallel to the tracking direction 54, and the acceleration component 52 and the focus direction 55 which are parallel to the tracking direction 54. The tilt sensitivity axis acceleration sensor 35 is arranged so that the sensitivity axis 51 has the acceleration component 53 in the direction parallel to.

The horizontal sensitivity axis acceleration sensor 36 detects the acceleration in the tracking direction, and the amplifier filter 1
The tracking direction acceleration signal 41 having the necessary gain and frequency characteristics at 1 is added to the actuator drive signal 6 by the tracking addition device 22 and output to the actuator tracking direction drive device 23.

The actuator tracking direction drive device 23 outputs an actuator tracking direction drive current 20 to drive the actuator 1 in the tracking direction.

Further, an inclination-direction acceleration signal 42 and a tracking-direction acceleration signal 41 having gain and frequency characteristics necessary for the amplifier filter 11 including the acceleration in the tracking direction and the acceleration in the focus direction by the inclination-sensitive axis acceleration sensor 35. Arithmetic unit 3 for addition or subtraction of
Focus direction acceleration signal 43 which is the signal calculated in 4.
Is added to the actuator driving signal 6 by the focus adding device 32 and output to the actuator focus direction driving device 33.

The actuator focus direction drive device 33 outputs an actuator focus direction drive current 30 to drive the actuator 1 in the focus direction.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention.
This will be described with reference to FIG.

In the second embodiment, a spindle motor 15 and an optical disk 16 which is a recording medium rotated by the spindle motor 15 are provided on the suspension chassis 61. Is provided with an optical pickup 2 and a traverse motor 17 that moves the optical pickup 2 in a tracking direction which is a radial direction of the optical disc 16, and the optical pickup 2 includes an actuator 1.

A board 63 is mounted on the suspension chassis 61, and the board 63 has an acceleration sensor 9 and a circuit 6 for operating the acceleration sensor 9.
6 and 6 are mounted, and a part or the whole of the acceleration sensor 9 and the circuit 66 for operating the acceleration sensor 9 is covered with a case 65 having a shield function.

The acceleration sensor 9 is an acceleration sensor having a sensitivity axis in a direction parallel to the mounting surface, a direction perpendicular to the mounting surface, or another direction. Ground wiring 64 is substrate 63
It is located on the back side of the acceleration sensor 9 in the upper ground wiring portion.

The actuator 1 and the optical pickup 2
Has the same structure as the actuator 1 and the optical pickup 2 in the first embodiment.

Next, the operation of the second embodiment will be described. As shown in FIG. 3, the optical disc 16 is rotated by the spindle motor 15 and the pickup 2 is driven by the traverse motor 17 in order to move the focus position to the vicinity of a track where desired information can be recorded or read. Further, the optical pickup 2 is moved by the access motor 17. By driving the actuator 1 on the information on the optical disc 16, the focal position where the information on the optical disc 16 can be recorded or read is made to follow the target position to record or read the information.

The shield case 65 surrounding the acceleration sensor 9 and the circuit 66 on the substrate 63 fixed to the suspension chassis 61 and the ground wiring 64 are connected to the circuit 66 of the noise component emitted from the spindle motor 15 or the access motor 17 or the actuator 1. Can be prevented and the output signal of the acceleration sensor 9 from which the noise component has been removed is added to the servo loop for actuator control.

(Third Embodiment) FIG. 4 shows a third embodiment of the present invention.
This will be described with reference to FIG.

In the third embodiment, the set 60, which is a mechanical portion fixed to the outer portion of the optical disk device to which external vibration is directly transmitted, has a damping material 62 which absorbs high frequency components of external vibration. A suspension chassis 61 is provided through the suspension chassis 61, and a spindle motor 15 and an optical disk 16 which is a recording medium rotated by the spindle motor 15 are provided on the suspension chassis 61. An optical pickup 2 and a traverse motor 17 for moving the optical pickup 2 in a tracking direction which is a radial direction of the optical disc 16 are provided on the upper side of the optical pickup 2. The optical pickup 2 includes an actuator 1. An acceleration sensor 9 is provided on the suspension chassis 61.

The actuator 1 and the optical pickup 2
Has the same structure as the actuator 1 and the optical pickup 2 in the first embodiment. The actuator drive device 4 outputs a drive current 3 for driving the actuator 1. The error signal 5 is a signal indicating the amount of positional deviation between the focus position and the recordable / readable position on the optical disk in the tracking direction or the focus direction. Based on the error signal 5, the servo device 7 outputs an actuator drive signal 6 which is a drive voltage for driving the actuator 1 so that the focal position follows a recordable / readable position on the optical disk where information can be recorded or read on the optical disk. Output.

The acceleration sensor 9 detects the vibration acceleration 8 applied to the optical disk device from the outside. The acceleration sensor 9 has an axis of sensitivity in a direction parallel to the mounting surface, a direction perpendicular to the mounting surface, or another direction. Is.

The amplifier filter 11 sets the gain and frequency characteristics of the acceleration detection signal 10 detected by the acceleration sensor 9. Accelerometer output signal 12
Is a signal in which the output of the acceleration sensor 9 is provided with necessary gain and frequency characteristics by the amplifier filter 11.

The adder 13 adds the acceleration sensor output signal 12 to the actuator drive output signal 6 and outputs it to the actuator drive device 4. Comparator 70
Is a device for determining that the acceleration sensor output signal 12 is at a certain level or higher.

The self-check device 71 is a device which determines that the acceleration sensor output signal 12 is normal when the number of times that the acceleration sensor output signal 12 is a certain level or more is once or more during the time when the optical pickup 2 is moving.

The abnormality display device 72 is a display device which informs the user of the abnormality when the acceleration sensor 9 is determined to be abnormal. The vibration-proof mode switching device 73 is the acceleration sensor 9
Is a device that switches to another vibration resistant mode such as increasing the loop gain when it is determined to be abnormal.

Next, the operation of the third embodiment will be described.
As shown in FIG. 4, the optical disk 16 is attached to the spindle motor 1
The pickup 2 is driven by the traverse motor 17 in order to move the focus position to the vicinity of a track where desired information can be recorded or read by rotating the pickup 2 by the traverse motor 17. Further, by driving the actuator 1 with respect to the information on the optical disc 16, the focal position where the information can be recorded or read on the optical disc 16 is made to follow the target position to record or read the information.

When the acceleration sensor 9 is operated, the traverse motor 17 moves the optical pickup 2 to vibrate the entire suspension chassis 61 supported by the damping material 62 fixed to the set 60, and the vibration is generated. And an amplifier filter 11 obtains an acceleration sensor output signal 12 having necessary gain and frequency characteristics. Then, the comparator 70 determines whether the acceleration sensor output signal 12 is above or below a certain level, and the self-check device 71 determines whether it is normal or above. When it is determined that there is an abnormality, the abnormality display device 72 notifies the user of the abnormality, or the vibration-proof mode switching device 73 causes another vibration-proof system to operate.

(Fourth Embodiment) FIG. 5 shows a fourth embodiment of the present invention.
This will be described with reference to FIG.

In the fourth embodiment, the set 60, which is a mechanical portion fixed to the outer portion of the optical disk device to which external vibration is directly transmitted, has a damping material 62 which absorbs high frequency components of external vibration. A suspension chassis 61 is provided through the suspension chassis 61, and a spindle motor 15 and an optical disk 16 which is a recording medium rotated by the spindle motor 15 are provided on the suspension chassis 61. An optical pickup 2 and a traverse motor 17 for moving the optical pickup 2 in a tracking direction which is a radial direction of the optical disc 16 are provided on the upper side of the optical pickup 2. The optical pickup 2 includes an actuator 1. An acceleration sensor 9 is provided on the suspension chassis 61.

The actuator 1 and the optical pickup 2
Has the same structure as the actuator 1 and the optical pickup 2 in the first embodiment.

The actuator driving device 4 outputs a driving current 3 for driving the actuator 1. The error signal 5 is a signal indicating the amount of positional deviation between the focus position and the recordable / readable position on the optical disk in the tracking direction or the focus direction.

The servo device 7 drives the actuator 1 based on the error signal 5 so as to drive the actuator 1 so that the focal position follows the recordable and readable position on the optical disk where information can be recorded or read on the optical disk. The signal 6 is output.

The acceleration sensor 9 detects the vibration acceleration 8 applied to the optical disk device from the outside. The amplifier filter 11 sets the gain and frequency characteristics of the acceleration detection signal 10 detected by the acceleration sensor 9. The acceleration sensor output signal 12 is a signal obtained by giving the output of the acceleration sensor 9 an amplifier filter 11 necessary gain and frequency characteristics.

The adder 13 adds the acceleration sensor output signal 12 to the actuator drive output signal 6 and outputs it to the actuator drive device 4. The A / D device 80 is a device for converting the acceleration sensor output signal 12 into a digital signal. Further, the gain switching device 81 is the acceleration output signal 1 converted into a digital signal by the A / D device.
Amplifier filter 1 so that the level of 2 becomes a constant level
This is a device for changing the gain of 1.

Next, the operation of the fourth embodiment will be described.
As shown in FIG. 5, the optical disk 16 is attached to the spindle motor 1
The pickup 2 is driven by the traverse motor 17 in order to move the focus position to the vicinity of a track where desired information can be recorded or read by rotating the pickup 2 by the traverse motor 17. Further, by driving the actuator 1 on the information on the optical disc 16, the focus position where the information on the optical disc can be recorded or read is made to follow the target position to record or read the information.

When operating the acceleration sensor 9, the optical pickup 2 is moved by the traverse motor 17 to vibrate the entire suspension chassis 61 supported by the damping material 62 fixed to the set 60, and the vibration is generated. And an amplifier filter 11 obtains an acceleration sensor output signal 12 having necessary gain and frequency characteristics.

The gain switching device 81 changes the gain of the amplifier filter 11 so that the acceleration sensor output signal 12 digitally converted by the A / D device 80 becomes a constant level.

[0063]

As described above, in the optical disk vibration damping control device according to the invention of claim 1, a horizontal sensitivity axis acceleration sensor having a sensitivity axis in a parallel direction and a horizontal sensitivity axis acceleration sensor parallel to the mounting surface. By using two tilt-sensitive axis acceleration sensors having a sensitivity axis in a direction other than the vertical direction, the detection accuracy of the acceleration in the tracking direction generated when the acceleration is detected by the two tilt-sensitive axis acceleration sensors is not deteriorated. The acceleration in the focus direction can be detected. Thereby, it is possible to easily realize an optical disk vibration damping control device having excellent vibration resistance.

Further, in the optical disk vibration damping control apparatus according to the invention of claim 2, not only the effect of the invention of claim 1 described above can be obtained, but also the whole or part of the circuit for operating the acceleration sensor is enclosed. By using the shield material for removal, noise due to the spindle motor for rotating the optical disc unique to the optical disc device or noise due to the access motor for moving the optical pickup can be eliminated, and the noise generation amount of the motor should be considered. It is possible to realize an optical disc vibration suppression control device without using the optical disc vibration control device.

Further, in the optical disk vibration damping control device according to the invention of claim 3, not only the effect of the invention of claim 1 described above can be obtained, but also the deterioration of the vibration resistance characteristic of the optical disk device due to the failure of the acceleration sensor is beforehand. By determining the failure of the acceleration sensor, it is possible to immediately improve the vibration resistance by another measure or notify the user of the failure.

In addition, in the optical disk vibration damping control device according to the invention of claim 4, not only the effect of the invention of claim 1 described above can be obtained, but also the gain adjustment according to the detection sensitivity of the acceleration sensor is performed. Thus, it is possible to prevent the initial sensitivity error of the acceleration sensor itself, the detection sensitivity fluctuation due to the temperature fluctuation of the acceleration sensor, the sensitivity error generated in the actuator, and the vibration resistance deterioration of the optical disk device due to the deterioration of the acceleration sensor detection sensitivity with time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an optical disk vibration damping control device according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of an optical disk vibration damping control device according to a first embodiment of the present invention.

FIG. 3 is a block diagram of an optical disk vibration damping control device according to a second embodiment of the present invention.

FIG. 4 is a block diagram of an optical disk vibration damping control device according to a third embodiment of the present invention.

FIG. 5 is a block diagram of an optical disk vibration damping control device according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram of a conventional optical disk vibration damping control device.

[Explanation of symbols]

1 Actuator 2 Pickup 3 Drive current 4 Actuator drive device 5 Error signal 6 Actuator drive signal 7 Servo device 8 Vibration acceleration applied to the optical disk device from outside 9 Accelerometer 10 Acceleration detection signal 11 Amplifier filter 12 Accelerometer output signal 12 13 Adder 15 Spindle motor 16 Optical disk 17 Access motor 20 Actuator tracking direction drive current 21 Tracking error signal 22 Tracking addition device 23 Actuator tracking direction drive device 30 Actuator focus direction drive current 31 Focus error signal 32 Focus addition device 33 Actuator focus direction drive device 34 Arithmetic device 35 Inclination sensitivity axis acceleration sensor 36 Horizontal sensitivity axis acceleration sensor 41 Track King direction acceleration signal 42 Tilt direction acceleration signal 43 Focus direction acceleration signal 50 Direction parallel to tracking direction 51 Direction of angle other than parallel and perpendicular to mounting surface 52 Direction of angle other than parallel and perpendicular to mounting surface 5
1 Acceleration of tracking direction component of acceleration 53 Direction 5 at an angle other than parallel and perpendicular to the mounting surface 5
1 Acceleration of the focus direction component of acceleration 54 Tracking direction 55 Focus direction 60 Set 61 Suspension chassis 62 Damping material 63 Board 64 Ground wiring 65 Shield case 66 Circuit that makes acceleration sensor 70 Comparator 71 Self-check device 72 Abnormality display device 73 Vibration resistance Mode switching device 80 A / D device

Claims (4)

[Claims] 1. An actuator for moving an actuator, which moves a focus position where information can be recorded and read when recording or reading information on an optical disk, in a tracking direction which is a radial direction of the optical disk, or a direction perpendicular to the optical disk surface. An actuator focus direction drive device that moves in the focus direction,
A servo device that outputs an actuator drive signal that is a voltage signal that drives the actuator so as to reduce an error signal that indicates the amount of positional deviation in the tracking direction or the focus direction between the focus position and the recordable / readable position on the optical disk, and the mounting surface. Tracks the horizontal sensitivity axis acceleration sensor that has the sensitivity axis in the parallel direction, the tilt sensitivity axis acceleration sensor that has the sensitivity axis in the direction other than parallel and perpendicular to the mounting surface, and the sensitivity axis of the horizontal sensitivity axis acceleration sensor. A means for detecting a tracking direction acceleration signal which is an acceleration in the tracking direction by arranging so as to match the direction, and an inclination sensitivity axis acceleration sensor having a sensitivity axis in the tracking direction and the direction including the focus acceleration component. Acceleration in the tracking direction and acceleration in the focus direction And a means for detecting a tilt direction acceleration signal which is an acceleration in the focus direction, a means for calculating a focus direction acceleration signal which is an acceleration in the focus direction by calculating a difference or a sum of the tracking direction acceleration signal and the tilt direction acceleration signal, and tracking An optical disk vibration damping control device comprising: means for adding a direction acceleration signal or a focus direction acceleration signal to each actuator drive signal. 2. An acceleration sensor having a sensitivity axis in a direction parallel to the mounting surface, in a direction perpendicular to the mounting surface, or in a direction other than that, and a shield material for noise removal surrounding all or part of a circuit for operating the acceleration sensor. The optical disk vibration damping control device according to claim 1, further comprising: 3. An optical pickup, which is a component for detecting information on an optical disk, including an acceleration sensor having a sensitivity axis in a direction parallel to the mounting surface, a direction perpendicular to the mounting surface, or another direction, and an actuator, is moved in the optical disk radial direction. Means for vibrating the acceleration sensor by
2. The optical disk vibration damping control device according to claim 1, further comprising means for confirming that the acceleration sensor can detect vibration normally. 4. An optical pickup, which is a component for detecting information on an optical disk, including an acceleration sensor having a sensitivity axis in a direction parallel to the mounting surface, a direction perpendicular to the mounting surface, or another direction, and an actuator, is moved in the optical disk radial direction. Means for vibrating the acceleration sensor by
4. The optical disk vibration damping control device according to claim 3, further comprising means for adjusting a gain of the acceleration sensor according to a level of an acceleration signal which is an output of the acceleration sensor generated by moving the optical pickup.