JP2002298520A - Disk recording/reproduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a disk recording/reproduction device capable of preventing damage due to collision to a mechanical mechanism part by instantly braking an optical head part and decelerating the optical head part when impact is received from the outside during recording/reproducing operation. SOLUTION: In this dick recording/reproduction device in which an optical head mechanism part is driven along a guide shaft by a voice coil type linear motor, a main guide shaft 9 that feeds and drives the optical head mechanism part 6 is inserted into a brake mechanism 35 formed by a bimorph structure where an electrode 39 is sandwiched between inner and outer double cylindrical piezoelectric ceramics 37 and 38, the brake mechanism 35 is energized when the disk device receives shock during recording/reproducing operation or seek operation by the optical head mechanism part 6, the shape deformation of the piezoelectric ceramics 38 and 38 brings the brake mechanism 35 into frictional contact with the main guide shaft 9 to generate braking force in the optical head mechanism 6, and the optical head mechanism part 6 is prevented from being damaged by collision by decelerating the optical head mechanism 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disk drive device such as an optical disk or a magneto-optical disk,
The present invention relates to a disk recording / reproducing apparatus in which an optical head mechanism is driven linearly along a guide axis by using a voice coil type linear motor as a drive source. More specifically, the optical head mechanism has a brake mechanism made of piezoelectric ceramic, When a shock is detected during a reproducing operation or a seek operation, the brake mechanism is brought into frictional contact with the guide shaft to apply a brake to reduce the speed and prevent the optical head from being damaged.

[0002]

2. Description of the Related Art Conventionally, an optical head or a magneto-optical head (hereinafter, referred to as an optical head) for recording information on a disk recording medium such as an optical disk or a magneto-optical disk or reproducing the information recorded on the disk recording medium. As a feed driving unit, a voice coil type linear motor is known. The use of a linear motor has the characteristic that the time required to move the optical head to a predetermined writing position or reading position can be greatly reduced.

The optical or magneto-optical disk drive using the above-described linear motor has already been put to practical use, and is widely applied to, for example, a data storage device of a computer and some portable disk recording / reproducing devices. In addition, a drive using a linear motor has a short seek time and can perform high-precision positioning, so that a highly reliable disk drive device can be obtained.

[0004]

The linearator is composed of a fixed portion composed of a magnet and a yoke magnetized in a predetermined direction, and a movable coil that can move linearly magnetically in a non-contact state along the yoke. The optical head is held on the movable coil side. In other words, the movable coil is designed so that the magnetic holding force can be held at least by the optical head.

For this reason, when a disk drive device during recording / reproduction receives a large impact force, for example, a magnetic holding force due to a drop or the like, an impact force is also generated in the optical head portion, which is a movable portion. It is assumed that the optical head unit collides with the mechanical mechanism unit and is damaged.

For example, as a countermeasure against the above-mentioned problem, it is conceivable to stop the optical head mechanically by detecting the impact force of the disk drive device with a shock sensor and stopping the optical head portion instantaneously. It is technically difficult to stop the optical head, and the optical head collides before the optical head stops. Even if the optical head is stopped momentarily, the optical head cannot be protected by the impact force at this time. Incidentally, assuming that the movable coil is magnetically provided with a holding force enough to withstand the impact force of the optical head, a large linear motor is required, which is not practical.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. When an impact is applied, the optical head is instantaneously braked to decelerate the optical head and collide with a mechanical mechanism. It is an object of the present invention to obtain a disk recording / reproducing apparatus capable of preventing damage due to the above.

[0008]

In order to achieve the above object, a desk recording / reproducing apparatus according to the present invention provides a disk recording / reproducing apparatus in which an optical head mechanism is driven linearly along a guide shaft by a voice coil type linear motor. In a disk recording / reproducing apparatus which records information on a recording medium or reproduces information recorded on a disk recording medium, an optical head mechanism portion includes a brake mechanism having a piezoelectric element having a mobile structure so as to face a guide shaft. It is a thing.

According to the disk recording / reproducing apparatus described above,
During a recording / reproducing operation or a seek operation of the disk recording medium by the optical head mechanism, when an external shock is applied, it is detected by, for example, a shock sensor.
When an electric field is applied to the piezoelectric element by a signal from the shock sensor, the piezoelectric element is deformed in shape and frictionally contacts the guide shaft, generating a braking force on the optical head mechanism and decelerating. The impact force received can be reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk recording / reproducing apparatus according to the present invention will be described below with reference to the drawings, taking a portable type magneto-optical recording / reproducing apparatus such as a mini disk as an example.

FIG. 1 is an external perspective view of the magneto-optical disk recording / reproducing apparatus viewed from the back side (optical pickup side), and FIG. 2 is a plan view of the same viewed from the back side.

First, the configuration of the main part of the magneto-optical disk recording / reproducing apparatus will be described with reference to FIGS. Reference numeral 1 denotes a mechanical chassis that constitutes the main body of the magneto-optical disk recording / reproducing apparatus, and the cartridge holder 3 can be opened and closed in a flip-up manner with a hinge 2 provided at one end of the mechanical chassis 1 as a pivot point. It is supported. At the eject position where the cartridge holder 3 is jumped up, the disk cartridge 4 indicated by a virtual line is taken in and out.

A spindle motor 5 is disposed at the center of the rear surface side of the mechanical chassis 1, and a magneto-optical disk stored in the disk cartridge 4 is chucked on a chucking plate (not shown) directly connected to an output shaft of the spindle motor 5. It is supposed to be king.

On the back side of the mechanical chassis 1, an optical pickup mechanism unit 6 in which a beam splitter, an objective lens, and the like are unitized together with a laser light source is arranged.
The optical pickup mechanism 6 has a pair of bearings 7, 7 provided at one end thereof slidably held on a main guide shaft 9 via oil-impregnated metal bearings 8, 8 attached to the respective inner surfaces thereof. A U-shaped guide groove 10 provided on the other end side of the optical pickup mechanism 6 is slidably held by the other auxiliary guide shaft 11 supported by the mechanical chassis 1. The main guide shaft 9 and the sub guide shaft 11 are supported in parallel so that both end portions are sandwiched between positioning pins 12 and screws 13, respectively.

The above-described optical pickup mechanism 6 is positioned so as to cross an opening 14 opened in the mechanical chassis 1 while being held by the main guide shaft 9 and the sub guide shaft 11.
An objective lens (not shown) faces the magneto-optical disk through an open shutter window of the disk cartridge 4 facing the opening 14.

The optical pickup mechanism 6 has a frame 1
5 is fixed by screws 16
Is formed on the cartridge holder 3 side, and a suspension arm (not shown) which is vertically movable by a support is attached to the bent end, and a magnetic head (not shown) is attached to the tip of the suspension arm. . The magnetic head is located at a position facing the objective lens of the optical pickup mechanism 6 with the magneto-optical disk interposed therebetween.

On the other hand, the optical pickup mechanism 6 and the magnetic head are linearly moved integrally with a voice coil type linear motor 17 as a drive source. The magnetic yoke 18 of the linear motor 17 is made of, for example, a silicon steel plate or an electromagnetic soft iron plate, and is formed by bending the upper and lower yoke plates 18 into a U-shape.
Open ends of a and 18b are connected by another yoke plate 19. The lower yoke plate 18b is fixed to the mechanical chassis 1 in parallel with the guide shaft 11, and a magnet plate 20 is fixed to the inner surface of the yoke plate 18b by bonding or the like. A coil 21 wound in an annular shape is provided on the back surface of the frame 15 facing the yoke plate 18a on the opposite side of the mechanical chassis 1.
Is fixed by bonding or the like so that the coil 21 does not contact the upper yoke plate 18b.

When a current is applied to the coil 21, the linear motor 17 configured as described above generates a thrust in a direction in accordance with Fleming's left-hand rule according to the direction and magnitude of the current. The optical pickup mechanism 6 and the magnetic head described above are linearly moved along the main guide shaft 9 and the sub guide shaft 11 in the so-called radial direction of the magneto-optical disk.

On the back surface of the mechanical chassis 1 opposite to the optical pickup mechanism 6 with the spindle motor 5 interposed therebetween, the mode lever 22 has a pair of elongated guide grooves 23, 23 formed by guide pins 24. , 24, and are slidably mounted. The drive source of the mode lever 22 is a mode motor 25 such as a DC motor or a stepping motor.
A worm wheel 27 of a two-stage gear meshes with a worm gear 26 which is an output shaft of the pinion gear 2 of the two-stage gear.
8 is a rack gear 29 formed on a part of the mode lever 22
Are engaged. That is, the mode lever 22 is moved in the range of the guide groove 23 by the forward / reverse rotation of the mode motor 25,
The slide can be moved.

A selector plate 30 is provided on the mode lever 22, and one slit-like signal detection groove 31 is formed in the detection plate 30. On the detection plate 30, three photo interrupters 32a, 32b, and 32c are disposed so as to be sandwiched therebetween. That is, the signal detection groove 31
Are detected by the three photo interrupters 32a, 32b, and 32c, respectively, to be three mode operation positions of the mode lever 22.

Here, one end of the mode lever 22 is bent at right angles to the optical pickup mechanism 6.
An arm lever 33 extending to the side is formed, and a hook-shaped protruding piece 34 is provided at the tip of the arm lever 33.

The above three mode operations are an eject / stop mode operation, a reproduction mode operation, and a recording mode operation.

In the eject / stop mode operation, the signal detection groove 31 of the mode lever 22 is
The position is detected at 2a, and the optical pickup mechanism 6 turns on the initialize switch S, and it is recognized that the optical pickup mechanism 6 has moved to the innermost peripheral side of the disk. In the eject / stop mode operation, the cartridge holder 3 is flipped up with the hinge 2 as a fulcrum, and the loading and unloading of the disk cartridge 4 into and from the cartridge holder 3 can be performed.

Further, the projection 34 of the arm lever 33 extending from the mode lever 22 is engaged with the concave portion 6a provided in the optical pickup mechanism 6, and the optical pickup mechanism 6 is mechanically locked. Becomes That is, in the eject / stop mode operation, when the linear motor 17 is not energized, the optical pickup mechanism 6
Is restrained without moving sneakly.

In the reproduction mode operation, the signal detection groove 31 of the mode lever 22 is detected by the photo-interrupter 32b, and the protrusion 34 of the arm lever 33 extending from the mode lever 22 is moved to the concave portion of the optical pickup mechanism 6. 6A, the mechanical lock of the optical pickup mechanism 6 is released, and the energization of the linear motor 17 causes the optical pickup mechanism 6 to read the magneto-optical disk.

In the recording mode operation, the signal detection groove 31 of the mode lever 22 is detected by the photo-interrupter 32c, and the projection 34 of the arm lever 33 extending from the mode lever 22 is moved to the concave portion of the optical pickup mechanism 6. Further, the mechanical unlocking of the optical pickup mechanism 6 is maintained further away from the optical pickup mechanism 6a, and the writing operation to the disk by the optical pickup mechanism 6 is performed by the energization of the linear motor 17.

The above-described optical pickup mechanism 6
During the recording / reproducing operation by the disc recording / reproducing device,
Alternatively, when the disk recording / reproducing device receives an impact due to dropping during the seek operation, the optical pickup mechanism 6
There is provided a brake mechanism using piezoelectric ceramics for receiving the acceleration and decelerating it so as not to collide with the end of the mechanical mechanism.

Hereinafter, several embodiments of a brake mechanism using piezoelectric ceramic will be described.

[First Embodiment] FIG. 3 is a perspective view of the optical pickup mechanism 6 on the main guide shaft 9 side, and FIG. 4 is a sectional view of a brake mechanism. The brake mechanism 35 is disposed between the pair of bearings 7, 7 of the optical pickup mechanism 6,
The cross-section is a substantially C-shaped cylindrical body, has a gap on the order of several μm to several tens of μm with respect to the outer peripheral surface of the main guide shaft 9, and a fixed portion made of an elastic material is provided on the optical pickup mechanism 6. 36 attached.

More specifically, the brake mechanism 3
Reference numeral 5 denotes a so-called bimorph structure in which an electrode 39 is sandwiched between an inner peripheral side piezoelectric ceramic 37 and an outer peripheral side piezoelectric ceramic 38 so as to have a cylindrical shape.

Generally, the piezoelectric ceramic is a ferromagnetic material,
Since there is spontaneous polarization even in the absence of an external magnetic field, when an electric field is applied in the direction of spontaneous polarization, the piezoelectric ceramic expands in the direction of polarization and contracts in the direction perpendicular to the polarization. Alternatively, when an electric field is applied in a direction opposite to the spontaneous polarization, the material shrinks in the polarization direction and expands in the vertical direction.

Therefore, in the present invention, the piezoelectric ceramic 37
The polarization directions of and 38 are aligned so as to be polarized from the inside to the outside as shown by the arrows, and the inner peripheral side of the piezoelectric ceramic 37 and the outer peripheral side of the piezoelectric ceramic 38 are each set to a positive pole as shown in FIG. When an electric field is applied with the electrode 39 being a negative pole,
The outer piezoelectric ceramic 38 extends in the circumferential direction, and the inner piezoelectric ceramic 37 contracts in the circumferential direction, so that the inner diameter of the outer piezoelectric ceramic 37 contracts. That is, when the disk recording / reproducing apparatus receives an impact force due to a drop or the like during a recording / reproducing operation by the disk recording / reproducing apparatus or during a seek operation, the shock is sensed by the shock sensor, and the signal is output from the shock sensor to brake. When an electric field is applied to the mechanism 35, the inner piezoelectric ceramic 37 contracts.
Is brought into contact with the main guide shaft 9 to generate a frictional force. As a result, the optical pickup mechanism 6 is braked and instantaneously decelerated to reduce the impact. Damage due to collision can be prevented.

According to the above-described brake mechanism 35, the outer piezoelectric ceramic 38 extends and the inner piezoelectric ceramic 3 extends.
By adopting a bimorph structure made of a piezoelectric ceramic having an inner / outer double structure such that the inner and outer members 7 shrink, extremely high deformation characteristics can be obtained, and the gap between the main guide shaft 9 and the brake mechanism 35 is, for example, about 5 to 20 μm. The braking function can be effectively obtained even when the setting is relatively wide. In addition, since the cylindrical piezoelectric ceramic is inserted into the main guide shaft 9 with a gap therebetween, the parameter of the gap error need only be adjustment of the shaft diameter of the main guide shaft 9, and therefore, the gap adjustment accuracy Can be increased.

Further, the braking function can be obtained even with one piece of piezoelectric ceramic by the above-described principle of deformation of the piezoelectric ceramic. In this case, as shown in FIG. 5, by applying an electric field with the outer peripheral side of the cylindrical piezoelectric ceramic 40 being polarized from the inside to the outside as indicated by an arrow as a negative pole and the inner peripheral side as a positive pole. The diameter of the piezoelectric ceramic 40 can be reduced in the radial direction. However, in this case, the amount of deformation of the piezoelectric ceramic 40 is smaller than that of the above-described bimorph structure. Suitable when the gap is 1 μm or less.

The case where the above-mentioned brake mechanism 35 is provided separately from the bearings 7 and 7 of the optical pickup mechanism 6 has been described. It may be constituted by a mechanism, whereby the number of parts can be reduced and the cost and size of the brake mechanism can be reduced.

Further, the main guide shaft 11 is braked. However, as shown in FIG. 6, a U-shaped portion is formed in the guide groove 10 provided at the other end of the optical pickup mechanism 6 by a fixing portion 41 made of an elastic material. A brake mechanism 42 having a bimorph structure in the form of a mold may be attached, and the brake mechanism 42 may also serve as a bearing for the optical pickup mechanism 6 on the sub-guide shaft 11 and apply a brake to the sub-guide shaft 11.

[Second Embodiment] In a brake mechanism 43 of this embodiment, an electrode 46 is sandwiched between two annular piezoelectric ceramics 44 and 45 as shown in FIGS. 7A and 7B. It has a bimorph structure, and the brake mechanism 43 is cantilevered by an optical pickup mechanism (not shown) by a fixing portion 47 made of an elastic body. In this case, the brake mechanism 43 aligns the polarization directions of the piezoelectric ceramic 44 and the piezoelectric ceramic 45 as indicated by arrows, sets the outer peripheral side of the piezoelectric ceramic 44 and the outer peripheral side of the piezoelectric ceramic 45 to the positive pole, and sets the electrode 46 to the negative pole. By applying an electric field to the poles, the piezoelectric ceramic 45 expands around the fixing part 47 as shown in FIGS.
In the brake mechanism 43, the piezoelectric ceramic is deformed in a bow shape in the thickness direction.

That is, when the brake mechanism 43 bends and deforms, the inner diameter portion 44a of the piezoelectric ceramic 44 comes into contact with the main guide shaft 9 to generate a frictional force, and the optical pickup mechanism is braked and decelerated to reduce the impact. can do.

FIGS. 9A and 9B show a preferred modification of the brake mechanism 43 described above. According to this, the brake mechanism 43 has upper and lower portions formed of two elastic portions 4 made of an elastic body.
The optical pickup mechanism is held by an optical pickup mechanism 7 and 47. In this case, when an electric field is applied to the brake mechanism 43, as shown in FIGS.
The portion of the piezoelectric ceramic 45 shifted by 90 ° from the fulcrum 7, 47 extends, the piezoelectric ceramic 44 contracts,
In the so-called brake mechanism 43, the piezoelectric ceramics on the left and right portions are bent and deformed in the thickness direction at the maximum in a bow shape.

Accordingly, the left and right inner diameter portions 44 of the piezoelectric ceramic 44 are deformed by bending the brake mechanism 43.
a and 44a come into contact with the left and right outer peripheral surfaces of the main guide shaft 9 to generate a frictional force, and the optical pickup mechanism is braked and decelerated to reduce the impact. The gap between the brake mechanism 43 is 1
Even if it is set to about 0 μm to 20 μm, the braking function can be obtained effectively.

[Third Embodiment] A brake mechanism according to a third embodiment of the present invention, as shown in FIGS.
An electrode 50 is provided between two flat piezoelectric ceramics 48 and 49.
Are supported by the optical pickup mechanism 6 so as to sandwich the main guide shaft 9 from above and below by using two sets of brake mechanisms 51a and 51b having a bimorph structure so as to sandwich the main guide shaft 9. In this case, the upper brake mechanism 51a aligns the polarization directions of the piezoelectric ceramic 48 and the piezoelectric ceramic 49 as indicated by arrows, sets the outer surface side of the piezoelectric ceramic 48 and the outer surface side of the piezoelectric ceramic 49 to positive polarity, and Is negative, while the lower brake mechanism 51b aligns the polarization directions of the piezoelectric ceramic 48 and the piezoelectric ceramic 49 as indicated by arrows, and sets the outer surface of the piezoelectric ceramic 48 and the outer surface of the piezoelectric ceramic 49 to a positive polarity, respectively. And electrode 50
Is-poled.

According to the above configuration, the brake mechanism 51
12b, the piezoelectric ceramic 48 expands and the piezoelectric ceramic 49 shrinks in the brake mechanism 51a, and the piezoelectric ceramic 49 expands and the piezoelectric ceramic 48 shrinks in the brake mechanism 51b, as shown in FIG. 12b. The so-called brake mechanism 51a
And 51b are bent and deformed toward the main guide shaft 9 side.

As a result, the flexure-deformable brake mechanisms 51a and 51b come into contact with the main guide shaft 9 to generate a frictional force, and the optical pickup mechanism is braked and decelerated, so that the impact can be reduced.

The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

In this embodiment, the brake mechanism of the magneto-optical disk recording / reproducing apparatus in which the feed mechanism of the optical pickup mechanism 6 is a linear motor type has been described.
The present invention can be widely applied to a brake mechanism of an optical pickup mechanism in a phase change optical disk device such as an optical disk device or an optical disk device such as a CD.

[0046]

As described above, in the disk recording / reproducing apparatus of the present invention, the optical head mechanism is provided with the brake mechanism in which the piezoelectric element has a mobile structure so as to face the guide shaft. When a shock is applied from the outside during the recording / reproducing operation or seek operation of the disk recording medium by the above, the piezoelectric element is energized, frictionally contacts the guide shaft due to its shape deformation, and generates a braking force on the optical head mechanism immediately. Can slow down,
The optical head mechanism can be prevented from being damaged, and a highly reliable brake mechanism can be provided.

In addition, since the shape deformation due to the energization of the piezoelectric element is used, the braking time due to friction is extremely short, so that the optical head mechanism is somewhat close to the end of the guide shaft. However, the frequency at which the optical head mechanism collides with the mechanical mechanism due to impact can be eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view of a magneto-optical disk recording / reproducing apparatus applied to the present invention as viewed from an optical pickup mechanism side.

FIG. 2 is a plan view of the magneto-optical disk recording / reproducing apparatus viewed from an optical pickup mechanism side.

FIG. 3 is a perspective view showing a state in which a brake mechanism made of piezoelectric ceramic according to the first embodiment is attached to a main guide shaft of an optical pickup mechanism.

4 is an operation explanatory view of the brake mechanism shown in FIG. 3;

FIG. 5 is an operation explanatory view of a modified example of the brake mechanism of FIG. 3;

FIG. 6 is a side view of a state where the brake mechanism is attached to a sub guide shaft of the optical pickup mechanism.

FIG. 7A is a plan view of a brake mechanism made of piezoelectric ceramic according to a second embodiment before operation. b is a side view of the brake mechanism before the operation.

FIG. 8A is a plan view of the same brake operation state. b is a side view of the brake operating state.

FIG. 9A is a plan view of another example of the brake mechanism made of piezoelectric ceramic according to the second embodiment before operation. b is a side view of the brake mechanism before the operation.

FIG. 10a is a plan view of the same brake operation state. b is a side view of the brake operating state.

FIG. 11 is a perspective view of a state in which a brake mechanism made of piezoelectric ceramic according to a third embodiment is attached to a main guide shaft of an optical pickup mechanism.

12a is a side view of the same before the operation of the brake mechanism. FIG. b is a side view of the operating state of the brake mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mechanical chassis, 3 ... Cartridge holder, 6 ... Optical pickup mechanism part, 7 ... Bearing part, 9 ... Main guide shaft, 1
0: guide groove, 11: sub guide shaft, 17: linear motor, 22: mode lever, 33: arm lever, 34 ...
Projection piece, 35 ... Brake mechanism, 36 ... Fixed part, 37,3
8: Piezoelectric ceramic, 39: Electrode, 40: Piezoelectric ceramic, 43: Brake mechanism, 44, 45: Piezoelectric ceramic, 46: Electrode, 47: Fixed part, 48, 49: Piezoelectric ceramic, 50: Electrode, 51a, 51b ... Brake mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D068 AA02 CC07 EE03 EE11 GG07

Claims (7)

[Claims] An optical head mechanism is driven linearly along a guide axis by a voice coil type linear motor,
In a disc recording / reproducing apparatus which records information on a disc recording medium or reproduces information recorded on the disc recording medium, a brake having a mobile structure of a piezoelectric element in the optical head mechanism so as to face the guide shaft. A brake mechanism is energized when a shock is applied to the disk recording / reproducing apparatus during a recording / reproducing operation or a seek operation of the disk recording medium by the optical head mechanism unit,
A disk recording / reproducing apparatus, wherein the brake mechanism is brought into frictional contact with the guide shaft due to its shape deformation to generate a braking force on the optical head mechanism. 2. The disk recording / reproducing apparatus according to claim 1, wherein the brake mechanism is energized by a signal when an impact applied to the disk recording / reproducing apparatus is detected by a shock sensor, and applies a braking force to the guide shaft. A disk recording / reproducing apparatus characterized in that the disk recording / reproducing apparatus is generated. 3. The disk recording / reproducing apparatus according to claim 1, wherein the brake mechanism has a bimorph structure in which an electrode is sandwiched between two inner and outer double cylindrical piezoelectric ceramics,
The brake mechanism is inserted into the guide shaft, and the piezoelectric ceramic is brought into frictional contact with the guide shaft by utilizing a deformation in which the piezoelectric ceramic is reduced in diameter by energizing the brake mechanism to generate a braking force. Disk recording and playback device. 4. The disk recording / reproducing apparatus according to claim 3, wherein the brake mechanism is used as a bearing of the optical head mechanism supported by the guide shaft. 5. The disk recording / reproducing apparatus according to claim 1, wherein the brake mechanism has a bimorph structure in which electrodes are sandwiched between two annular piezoelectric ceramics, and the brake mechanism is inserted into the guide shaft. A disk recording / reproducing apparatus which is mounted and makes frictional contact with the guide shaft by utilizing the deformation of the piezoelectric ceramic which flexes in the thickness direction when the brake mechanism is energized, thereby generating a braking force. 6. The disk recording / reproducing apparatus according to claim 1, wherein the brake mechanism has a flat bimorph structure in which electrodes are sandwiched between two piezoelectric ceramics, and the brake mechanism vertically moves the guide shaft. Confronted to sandwich
A disk recording / reproducing apparatus, wherein a frictional contact is made with the guide shaft by utilizing deformation of a piezoelectric ceramic which is bent by energization of the brake mechanism to generate a braking force. 7. The disk recording / reproducing apparatus according to claim 1, wherein the optical head mechanism is mechanically restrained by a lock mechanism when the disk recording / reproducing apparatus is not energized. Disk recording and playback device.