JPH1050009A - Optical pickup driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the device capable of suppressing positional deviation of an optical pickup as much as possible upon receipt of external impact force. SOLUTION: A driving part for linearly driving the optical pickup 10 by a linear motor 30 is provided with a brake mechanism 40 for braking the optical pickup 10 in its movement. When the optical pickup 10 is on standby, the brake mechanism 40 is operated. This brake mechanism 40 is composed of a braking rail 41 provided along a moving path of the optical pickup 10 and a piezoelectric element 42 fitted to a side surface of the optical pickup 10 opposite to the side surface of the braking rail 41, and when the piezoelectric element 42 is put in its nonelectrified state, the element is expanded to brake the optical pickup 10 by friction force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for an optical pickup used for recording / reproducing information on / from an information recording medium such as an optical disk, and more particularly to a drive device using a linear motor or a linear pulse motor as a drive source. And a linear feed type optical pickup driving device.

[0002]

2. Description of the Related Art FIG. 15 shows an optical disk device on which an optical pickup 112 is mounted. Disk cartridge 1
Inside the optical disk 25, an optical disk 126 is rotatable around a central axis by a spindle motor 124. The optical pickup 112 is movable with respect to the optical disk 126 in the radial direction. This drive is performed by moving the optical pickup 112 along a pair of sliding shafts 111,111.

[0003] Incidentally, as a drive system of the optical pickup, there are a screw feed system, a gear feed system, a linear feed system and the like.

[0004] Here, the screw feed system is a system in which a rotational force obtained from a drive source such as a DC motor is converted into a linear motion by a gear or the like and the movable unit of the optical pickup is fed.

[0005] The gear feed system refers to a system in which a ball screw is directly connected to a shaft (output shaft) of a driving source such as a stepping motor and the movable portion of the optical pickup is moved linearly.

[0006] The linear system refers to a system in which a movable portion of an optical pickup is linearly moved by a linear motor or a linear pulse motor.

FIG. 16 shows a conventional optical pickup driving device using a linear motor as a driving source. The driving device includes a permanent magnet 131 and a coil 132 that moves along the permanent magnet 131 as a driving source.
The movement of the optical pickup 112 connected to the light guide 112 is guided by a pair of guide shafts 120, 120.

FIG. 17 shows a conventional optical pickup driving device using a linear pulse motor as a driving source. The linear pulse motor includes a fixed part (stator) 161 and a movable part (movable element) 162, and the optical pickup 112 is connected to the movable part 162.

[0009] Each system is cost-effective, mass-productive, thin, power-saving,
Each of them has advantages and disadvantages in terms of high speed, impact resistance, and the like, so they are properly used depending on the purpose of the equipment to be used.

[0010] Among them, a device for moving an optical pickup at high speed generally uses a linear feed system using a linear motor. In addition, a linear feed method using a linear pulse motor is used for an apparatus which is easy to control and is considered for mass production.

[0011]

In a system using a conventional general linear motor as a driving source, the movable portion is in a free state when the optical pickup is stopped. For this reason, when an impact force is applied from the outside in this state, there is a problem that the position of the movable portion is shifted.

On the other hand, in a system using a conventional general linear pulse motor as a drive source, the optical pickup has a holding force in an energized state, but loses the holding force when the current is cut off (detent force by a permanent magnet). Only remains). In consideration of power saving, it is desirable to cut off the current when it is not necessary or to reduce the voltage and put it in a standby state, but in this state, like a linear motor, the position of the movable part is changed by an external impact force. There is a problem of shifting.

Due to the above-mentioned problem, in a conventional optical pickup driving device using a linear feed system, when an impact force is applied from the outside during stoppage (especially during a standby state in a linear pulse motor), the movable portion of the optical pickup moves. Sisters,
There is a disadvantage that it takes time to return the movable portion to a position before receiving an impact force from the outside.

More specifically, in a linear motor or a linear pulse motor, since a movable portion is supported using a sliding shaft or a ball bearing, disturbance such as an impact force occurs in a drive device of an optical pickup. Then, the movable portion of the optical pickup moves, and it takes time to return the movable portion to the position before the disturbance occurs.

As described above, the linear motor is frequently used in a drive device for moving the optical pickup at a high speed. In this case, the seek time is governed by the thrust of the linear motor. However, in a drive device that moves an optical pickup at a high speed, such as using a linear motor, further higher speed is required, and the conventional example described above could not meet such a demand. It is.

The present invention has been made in view of such circumstances, and an optical pickup driving device capable of minimizing the displacement of the movable portion of the optical pickup when receiving an external impact force. The purpose is to provide.

Another object of the present invention is to provide an optical pickup driving device capable of further increasing the speed of an optical pickup in the case of a linear feed system using a linear motor.

[0018]

According to the present invention, there is provided an optical pickup driving apparatus for driving an optical pickup linearly by a linear feed system, wherein a brake mechanism provided on the optical pickup, And a control section for operating the brake mechanism when the optical pickup is stopped to apply a braking force to the optical pickup, thereby achieving the above object.

Preferably, the control section operates the brake mechanism during a deceleration period in a seek operation of the optical pickup.

[0020] Preferably, the brake mechanism comprises:
It comprises a brake rail provided along the movement path of the optical pickup, and a piezoelectric element which contacts the brake rail in a non-energized state and separates from the brake rail in an energized state.

An optical pickup driving device according to the present invention is an optical pickup driving device for driving an optical pickup linearly by a linear feed system, wherein a brake mechanism provided on the optical pickup and the optical pickup driving device are mounted. A shock detection unit for detecting a shock force applied to the apparatus main body, and operating the brake mechanism when the optical pickup is stopped and a shock is detected by the shock detection unit, to apply a braking force to the optical pickup. And a control unit for providing the information.

Preferably, the control section operates the brake mechanism during a deceleration period in a seek operation of the optical pickup.

Preferably, the shock detecting section is a shock sensor comprising an acceleration sensor or the like or a detecting means utilizing electromagnetic induction.

[0024] Preferably, the brake mechanism comprises:
It comprises a brake rail provided along the movement path of the optical pickup, and a piezoelectric element which contacts the brake rail when energized and separates from the brake rail when not energized.

[0025] Preferably, the brake mechanism comprises:
It uses an electromagnet.

An optical pickup driving apparatus according to the present invention is an optical pickup driving apparatus for driving an optical pickup linearly by a linear feed system, wherein an impact force applied to an apparatus main body on which the optical pickup driving apparatus is mounted is detected. An impact detection unit; and a control unit that controls the optical pickup driving device to an operating state when the optical pickup is in a standby state and an impact force is detected by the impact detection unit. Is achieved.

Preferably, the shock detecting section is a detecting means using a shock sensor such as an acceleration sensor or electromagnetic induction.

The operation will be described below.

As described above, by operating the brake mechanism when the optical pickup is stopped, when the driving source is a linear motor, even if the movable portion is not held and an external impact force is received during the stop. It is possible to prevent the optical pickup from unexpectedly moving. Alternatively, the amount of movement can be reduced.

Similarly, when the driving source is a linear pulse motor, the optical pickup can be prevented from unexpectedly moving even if it receives an external impact while the movable portion is not held. Alternatively, the amount of movement can be reduced.

As a result, it is possible to quickly return the optical pickup to the original position before the occurrence of disturbance.

The brake mechanism includes a brake rail provided along the movement path of the optical pickup, and a piezoelectric element which contacts the brake rail in a non-energized state and separates from the brake rail in an energized state. Is used, the brake mechanism operates in a non-energized state, so that the amount of electric power required for braking the optical pickup can be reduced.

Further, according to the structure further including the shock detecting section, the brake mechanism is operated when the optical pickup is stopped and the shock is detected by the shock detecting section. In addition, even when an impact force is applied from the outside while the movable part is not held, the movement of the optical pickup is slightly suppressed. Similarly, when the driving source is a linear pulse motor, the movement of the optical pickup is slightly suppressed even when an external impact force is applied during a standby state in which the movable portion is not held. Also, the optical pickup is braked only when an impact force is received from the outside, so that the amount of power required for the braking is reduced.

In each of the above configurations, if the brake mechanism is operated during the deceleration period in the seek operation of the optical pickup, the deceleration of the optical pickup during this period can be increased. Therefore, the time required for deceleration can be shortened, and the acceleration period can be extended accordingly. Therefore,
Accordingly, the speed of the seek operation can be significantly increased.

Further, according to the structure having the shock detecting section and returning the driving device to the operating state when the optical pickup is in the standby state and when the shock is detected by the shock detecting section, for example, the driving source is a linear pulse motor. In this case, if an impact force is received from the outside during the standby state in which the movable section is not held, the standby state is released at the same time and the movable section is returned to the operating state, whereby the movable section is held. Therefore, the movement of the optical pickup when receiving an impact force from the outside is slightly suppressed. In addition, since the optical pickup is braked only when it receives an external impact, the amount of power required for the braking can be reduced.

[0036]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIGS. 1 to 5 show Embodiment 1 of the optical pickup driving apparatus of the present invention.

This optical pickup driving device is mounted on an optical disk device and is used to drive the optical pickup in the disk radial direction. The configuration will be described below.

As shown in FIG. 1, the optical pickup driving device comprises two parallel guide shafts 20 for supporting the optical pickup 10 so as to be able to move linearly, a linear motor 30 for driving the optical pickup 10, Optical pickup 1
Brake mechanism 40 for mechanically stopping (braking) the movement of zero
And a control unit 50 for controlling the operation of the brake mechanism 40. Hereinafter, the configuration of each unit will be described.

First, the linear motor 30 has a permanent magnet 31 provided along the moving path of the optical pickup 10 and a coil 32 moving along the permanent magnet 31. The coil 32, which is a movable part, is mechanically connected to the optical pickup 10.

The brake mechanism 40 includes the optical pickup 10
A brake rail 41 provided along the travel path of
A piezoelectric element 42 attached to the side surface of the optical pickup 10 so as to face the side surface of the brake rail 41;
The drive voltage of the piezoelectric element 42 is turned on / off by the control unit 50.

As shown in FIG. 2, the piezoelectric element 42 comes into contact with the brake rail 41 in a normal state, that is, in a non-energized state, and stops the movement of the optical pickup 10 by its frictional force.
On the other hand, at the time of energization, as shown in FIG. 2, it contracts in the direction in which the brake rail 41 faces the optical pickup 10 and expands in the direction in which the brake rail 41 extends. For this reason, when energized, one side of the piezoelectric element 42 is in a non-contact state with the brake rail 41. As a result, no friction force is generated, and the braking function is lost.

As shown in FIG. 3, the control unit 50 has a ROM
A CPU 51 for turning on / off the drive of the linear motor 30 and energization to the piezoelectric element 42 in accordance with a program stored in a 55; a first driver 52 for receiving a drive command from the CPU 51 and controlling the drive of the linear motor 30;
A second driver 53 receives an energization command from the CPU 51 and turns on / off a switch 54 inserted between the piezoelectric element 42 and the power supply.

Next, the control contents of the CPU 51 will be described with reference to FIG. When this program starts, the CPU 51 firstly executes the second driver 53 in step S1.
To the power supply stop command. As a result, the switch 54
The piezoelectric element 42 is turned off, and the piezoelectric element 42 is turned off. As a result, the piezoelectric element 42 comes into contact with the brake rail 41 to lock the optical pickup 10. Therefore,
In this state, even if disturbance such as an impact force occurs in the disk device, the optical pickup 10 does not unexpectedly move.
Alternatively, the amount of movement can be reduced.

Next, the CPU 51 issues a drive command for starting a seek operation to the first driver 52 in step S2, and subsequently issues a power supply command to the second driver 53 in step S3. As a result, the switch 54 is turned on, and the piezoelectric element 42 is turned on. As a result, the piezoelectric element 42 comes into a non-contact state with the brake rail 41, and loses the stopping function. That is, the optical pickup 10 becomes movable.

Next, the CPU 51 determines in step S4 that the first
Issue an acceleration command to the driver 52.

Thus, the optical pickup 10 performs an acceleration operation. Subsequently, the CPU 51 determines in step S5 that the first
The driver 52 issues a deceleration command to the driver 52. Thereby, the optical pickup 10 shifts to a deceleration operation. At this time, a power supply stop command is issued to the second driver 53 at the same time. As a result, the switch 54 is turned off, and the piezoelectric element 42 returns to the non-energized state. As a result, the piezoelectric element 42 contacts the brake rail 41 again, and stops the movement of the pickup 10.

Therefore, according to the first embodiment, the deceleration operation of the optical pickup 10 is efficiently performed by both the linear motor 30 and the piezoelectric element 42.

Subsequently, when the CPU 51 confirms that the optical pickup 10 has reached the target track in step S6, it ends this processing at that time.

According to the above control contents, the optical pickup 1
The brake mechanism 40 operates during the stop of 0 and during the deceleration period in the seek operation of the optical pickup 10. While the optical pickup 10 in which the linear motor 30 does not operate is stopped,
Although the movable part of the linear motor 30 is not electrically held, the brake mechanism 40 operates and the optical pickup 10 is mechanically held. Does not cause displacement.

When the brake mechanism 40 operates during the deceleration period in the seek operation of the optical pickup 10, FIG.
As shown in FIG. 5B, the deceleration of the optical pickup 10 during this period can be increased as compared with the conventional example shown in FIG. For this reason, the time required for deceleration can be shortened,
The acceleration period can be extended accordingly. Therefore, the seek operation can be speeded up accordingly.

[0052] Now a little specifically described, in the conventional example shown in FIG. 5 (a), the midpoint of the travel distance (= X _1/2) to accelerate to, then decelerated at the same acceleration (= alpha) However, in the present embodiment shown in FIG. 5B, the acceleration at the time of deceleration (= − (α + α ′) can be increased, so that it is possible to accelerate farther than the intermediate point of the moving distance, and as a result, the seek operation is greatly accelerated. Can be achieved.

According to the first embodiment, the brake mechanism 40 consumes power only when the optical pickup 10 is accelerated, so that it can contribute to power saving.

(Embodiment 2) FIG. 6 shows Embodiment 2 of the optical pickup driving device of the present invention. In the second embodiment, a linear pulse motor 6
0 is used.

Here, reference numeral 61 in the figure denotes a linear pulse motor 6.
Reference numeral 0 denotes a fixed part, and 62 denotes a movable part. Since it is difficult for the linear pulse motor 60 to perform mechanical braking during the deceleration period, in the second embodiment, the brake mechanism 40
Operates only when the optical pickup 10 is stopped, and locks the optical pickup 10 at the stop position. Other configurations are the same as those in the first embodiment, and corresponding portions are denoted by the same reference numerals and detailed description thereof will be omitted.

In the second embodiment, the linear pulse motor 6
Since the optical pickup 10 is locked at the stop position by the brake mechanism 40 while the optical pickup 10 is in a state in which the movable part 62 of the optical pickup 10 is not electrically held, the optical pickup 10 is locked even when an external impact force is applied. There is no displacement.

Further, since the brake mechanism 40 consumes power only when the optical pickup 10 operates, it can also contribute to power saving.

(Embodiment 3) FIGS. 7 to 10 show Embodiment 3 of the optical pickup driving apparatus of the present invention. Embodiment 3
The optical pickup driving device detects when an impact force is applied to the optical disc device from the outside, detects the impact force, operates the brake mechanism based on the detection signal, applies a brake to the optical pickup, and locks the optical pickup device. The optical pickup is configured to prevent unexpected movement or to reduce the movement amount.

First, the principle of the optical pickup driving device according to the third embodiment will be described with reference to FIG. As shown in FIG. 7, in the optical pickup driving device according to the third embodiment,
An optical disk device is provided with a sensor 101 for detecting an impact,
When the driving means 105 such as a linear motor is not driven,
Switch 1 between sensor 101 and brake mechanism 103
Turn ON 02. On the other hand, when a current flows through the optical disk device 100, the switch 102 is turned off.

When no current is flowing through the optical disk device 100, that is, when the optical pickup (more specifically, its movable portion) is in a standby state and no drive signal is input to the drive portion 100, the optical disk device When an impact is applied to the brake mechanism 103, the impact is detected by the sensor 101, and the switch 102 is turned on based on the detection signal to turn on the brake mechanism 103.
To work. As a result, the brake is applied to the optical pickup in the standby state, so that unexpected movement of the optical pickup is prevented. Or because the movement amount is reduced,
It can be quickly returned to the original position.

Here, the sensor 101 and the brake mechanism 10
Although various types can be considered for No. 3, the third embodiment
Here, a shock sensor 70 including an acceleration sensor or the like is used as a sensor, and a combination of a brake rail 41 and a piezoelectric element 42 attached to the side surface of the optical pickup 10 facing the side surface of the brake rail 41 is used as a brake mechanism. ing. The configuration and the operation will be described below with reference to FIGS. Note that portions corresponding to those in the above embodiment are denoted by the same reference numerals.

First, the shock sensor 70 is mounted on the optical disk device, that is, on the fixed side. Brake mechanism 4
As shown in FIG. 9, the zero piezoelectric element 42 is reduced during normal operation, that is, when power is not supplied, and a gap is formed between the piezoelectric element 42 and the brake rail 41. Therefore, in this state, the piezoelectric element 42 has lost its stopping function. On the other hand, at the time of energization, the piezoelectric element expands toward the brake rail 41 and comes into contact therewith. Therefore, in this state, the piezoelectric element 42 has a stopping function.

The control unit 50 controls the drive of the linear motor 30 and the CPU 51 for turning ON / OFF the power supply to the piezoelectric element 42.
And a drive command from the CPU 51, and
0, a second driver 53 that receives an energization command from the CPU 51, and turns on / off a switch 54 inserted between the piezoelectric element 42 and the power supply. I have.

Here, in the third embodiment, the CPU 51
Receives the shock detection signal from the shock sensor 70, turns on the switch 54 via the second driver 53,
The piezoelectric element 42 is energized.

More specifically, when an impact force is externally applied to the optical disk device during standby of the optical pickup 10 in which the movable portion of the linear motor 30 is not electrically held, the shock sensor 70 detects this. Is detected and reported to the CPU 51, and the CPU 51 that has received the information sets the piezoelectric element 42 to the energized state.

For this reason, in this energized state, the brake mechanism 40 operates and the optical pickup 10 is locked at the stop position.
Zero displacement is prevented, or the amount of movement is reduced.

Here, since the piezoelectric element 42 is energized only when an external impact force is applied to the optical disk device, the third embodiment can contribute to power saving.

Also, in the third embodiment, a configuration can be adopted in which the brake mechanism 40 is operated during the deceleration period in the seek operation of the optical pickup 10. According to such a configuration, since the deceleration can be increased, the seek operation can be speeded up.

(Embodiment 4) FIGS. 11 and 12 show Embodiment 4 of the optical pickup driving device of the present invention. In the fourth embodiment, the configuration of the brake mechanism is different from that of the third embodiment. Other configurations are the same as those of the third embodiment, and the corresponding parts are denoted by the same reference numerals.

The brake mechanism 40 includes a permanent magnet 43 and a friction member 45 attached to the side surface of the optical pickup 10, and a pressing means 44 provided on the fixed side of the optical disk device opposite to the side surface of the optical pickup 10. It has. The pressing means 44 is, as shown in FIG.
Coil 4 movably supported in the central axis direction by 4a
4b. The coil 44b has a friction member 44
c is affixed, and the spring 4
4d, the friction member 44c is pulled by the optical pickup 1
It is in a state separated from the friction member 43 on the 0 side.

On the other hand, when an electric current is applied to the coil 44b, the coil 44b is attracted by the permanent magnet 43, and the friction member 44c
Is brought into contact with the friction member 45 on the optical pickup 10 side.
Therefore, in this energized state, the optical pickup 10 can be locked.

Therefore, according to the fourth embodiment, similarly to the third embodiment, the displacement of the optical pickup 10 when an impact occurs is prevented, or the amount of movement of the optical pickup 10 is reduced.

(Embodiment 5) FIG. 13 shows an optical pickup driving apparatus according to a fifth embodiment of the present invention. In the fifth embodiment, an impact force detecting means 7 for detecting an impact force applied to the optical disk device
It has a characteristic at 0 '. As shown in FIG. 13, this impact force detecting means 70 'is provided with a permanent magnet 71 provided on the fixed side.
And a coil 72 provided on the movable side, that is, on the optical pickup 10 side, and detects an impact force using electromagnetic induction. That is, when the optical pickup 10 moves due to an impact, the coil 72
Moves relative to the permanent magnet 71, and an electromotive force is generated by electromagnetic induction. Therefore, a configuration is employed in which an impact force is detected by detecting the electromotive force.

The other structure is the same as that of the above-described embodiment.
A detailed description is omitted.

According to the fifth embodiment, similarly to the above-described embodiment, the displacement of the optical pickup 10 at the time of occurrence of an impact is prevented or the amount of movement is reduced.

(Embodiment 6) FIG. 14 shows Embodiment 6 of the optical pickup driving device of the present invention. In the sixth embodiment, as shown in FIG. 14, as shown in FIG. 14, when an impact force is applied to the optical disk device without providing a brake mechanism, the impact force is detected by the sensor 101, and a detection signal is given to the control unit 106. Then, when the driver drive signal is in the standby state, that is, when the optical pickup is in the standby state, the control unit 106 puts the drive unit 100 into a normal operation state and uses the electric holding force to reduce the movement amount due to the impact of the optical pickup. Suppress.

[0077]

According to the optical pickup driving apparatus of the present invention described above, the displacement of the optical pickup when receiving an external impact force can be suppressed as much as possible. The optical pickup can be quickly returned.

Also, the optical pickup is braked only when it receives an external impact force, and the amount of power required for the braking is suppressed, thereby contributing to power saving.

According to the optical pickup driving device of the present invention, the brake mechanism is used during the deceleration period in the seek operation of the optical pickup, so that the deceleration of the optical pickup during this period is reduced. Can be larger. Therefore, the time required for deceleration can be shortened, and the acceleration period can be extended accordingly. Therefore, the seek operation can be speeded up accordingly.

[Brief description of the drawings]

FIG. 1 is a perspective view showing Embodiment 1 of an optical pickup driving device of the present invention.

FIG. 2 is a schematic view showing the configuration and operation of a brake mechanism, showing Embodiment 1 of the optical pickup driving device of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a control unit according to the first embodiment of the optical pickup driving device of the present invention.

FIG. 4 is a flowchart showing control contents of a CPU, showing the first embodiment of the optical pickup driving device of the present invention.

5A and 5B are graphs showing a seek operation with a vertical axis representing a velocity and a horizontal axis representing a position. FIG. 5A is a graph showing a conventional example, and FIG. 5B is a graph showing the present invention.

FIG. 6 is a perspective view showing Embodiment 2 of the optical pickup driving device of the present invention.

FIG. 7 is a block diagram illustrating Embodiment 3 of the optical pickup driving device according to the present invention and illustrating a driving principle.

FIG. 8 is a perspective view showing Embodiment 3 of the optical pickup driving device of the present invention.

FIG. 9 is a schematic diagram illustrating a configuration and an operation of a brake mechanism according to a third embodiment of the optical pickup driving device of the present invention.

FIG. 10 shows an optical pickup driving device according to a third embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration of a control unit.

FIG. 11 is an optical pickup driving device according to a fourth embodiment of the present invention.
FIG.

FIG. 12 is a fourth embodiment of the optical pickup driving device of the present invention.
FIG. 2 is a schematic diagram showing a configuration and operation of a brake mechanism.

FIG. 13 shows an optical pickup driving device according to a fifth embodiment of the present invention.
FIG.

FIG. 14 is an optical pickup driving device according to a sixth embodiment of the present invention;
FIG.

FIG. 15 is a plan view showing an optical disk device.

FIG. 16 is a perspective view showing a conventional optical pickup driving device using a linear motor.

FIG. 17 is a perspective view showing a conventional optical pickup driving device using a linear pulse motor.

[Explanation of symbols]

 Reference Signs List 10 optical pickup 20 guide shaft 30 linear motor 40 brake mechanism 41 brake rail 42 piezoelectric element 50 control unit 60 linear pulse motor 70 shock sensor

Claims (10)

[Claims] 1. An optical pickup driving device for linearly driving an optical pickup by a linear feed system, comprising: a brake mechanism provided in the optical pickup; and operating the brake mechanism when the optical pickup is stopped. An optical pickup driving device comprising: a control unit for applying a braking force to the optical pickup. 2. The optical pickup driving device according to claim 1, wherein the control unit operates the brake mechanism during a deceleration period in a seek operation of the optical pickup. 3. The piezoelectric device, wherein the brake mechanism contacts a brake rail provided along a movement path of the optical pickup and the brake rail in a non-energized state, and separates from the brake rail in an energized state. 3. The optical pickup driving device according to claim 1, comprising an element. 4. An optical pickup driving device for driving an optical pickup linearly by a linear feed system, wherein a braking mechanism provided on the optical pickup and an impact force applied to an apparatus body on which the optical pickup driving device is mounted are controlled. An optical pickup, comprising: a shock detection unit for detecting; and a control unit that operates the brake mechanism when the optical pickup is stopped and a shock is detected by the shock detection unit, and applies a braking force to the optical pickup. Drive. 5. The optical pickup driving device according to claim 4, wherein the control unit operates the brake mechanism during a deceleration period in a seek operation of the optical pickup. 6. The optical pickup driving device according to claim 4, wherein the shock detection unit is a shock sensor including an acceleration sensor or a detection unit using electromagnetic induction. 7. The piezoelectric device, wherein the brake mechanism contacts a brake rail provided along a movement path of the optical pickup and the brake rail when energized, but separates from the brake rail when not energized. The optical pickup driving device according to any one of claims 4 to 6, comprising an element. 8. The optical pickup driving device according to claim 4, wherein the brake mechanism uses an electromagnet. 9. An optical pickup driving device for driving an optical pickup linearly by a linear feed system, comprising: an impact detector for detecting an impact force applied to an apparatus main body on which the optical pickup driving device is mounted; A control unit that controls the optical pickup driving device to be in an operating state in a standby state and when an impact force is detected by the shock detecting unit. 10. The optical pickup driving device according to claim 9, wherein the shock detection unit is a shock sensor including an acceleration sensor or detection means using electromagnetic induction.