JPH0935277A - Disk device and head driving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use an inexpensive vertical optical head without increasing the thickness of the disk device by housing a lower part of the vertical optical head into a recessed part of a chassis at the time of nonuse of an optical disk. SOLUTION: A mechanical unit 22 mounted with the vertical optical head 24 is supported via an insulator 29a by the chassis 20, and is brought in a descending state when a disk tray 4 is in an ejecting state, so that the lower part of the optical head 24 is housed in the recessed part 37 of the chassis 20. When the disk tray 4 is moved into a disk loading position, the mechanical unit 22 becomes an ascending state, and the optical disk is loaded. Under this state, the lower part of the optical head is separated from the recessed part 37, and is movable in an opening 231 in the radial direction of the optical disk. Thus, the inexpensive vertical optical head can be used without increasing the thickness of the disk device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc device having a function of reproducing an optical disc.

[0002]

2. Description of the Related Art A disk device for reproducing an optical disk such as a CD-ROM is known. 7 and 8 are side views each schematically showing the structure of a conventional disk device.

As shown in these figures, a disk drive 1
Reference numeral B denotes an apparatus main body 2 and a disk tray 4 which is moved in the front-rear direction (horizontal direction in the drawing) with respect to the apparatus main body 2 to be taken in and out.
It is composed of

The apparatus main body 2 includes a bottom plate 11, a main circuit board assembly 12 provided on the bottom plate 11, and a mechanism assembly 1 provided on the main circuit board assembly 12.
3 and a case 14 that covers the upper side of the mechanism assembly 13. The case 14 has a top plate portion 14a, and a disc clamper 38 is rotatably installed on the lower surface (inner surface) of the case 14 coaxially with a turntable 26 described later.

The mechanism assembly 13 has a chassis 20,
A mechanism unit 22 is supported on the chassis 20 so as to be vertically movable. This mechanical unit 22 has a base 23.
The base 23 has a spindle motor 25 for rotating a turntable, a turntable 26 fixed to its rotation shaft, an optical head 27, and the optical head 27.
And an optical head moving mechanism (not shown) for moving the optical disk 3 in the radial direction of the optical disk 3.

The base 23 is rotatably supported with respect to the chassis 20 via an insulator 29a made of an elastic body (rubber or the like) at the rear end (the inner side of the apparatus main body 2). By the operation of the vertical movement mechanism (not shown), the base 23 rotates around the insulator 29a, and the mechanism unit 22 moves up and down.

The disc tray 4 is a member on which the optical disc 3 is placed, and in accordance with the vertical movement of the mechanical unit 22 caused by the operation of the vertical movement mechanism, the loading position of the optical disc and the optical disc are set in the front-back direction with respect to the apparatus main body 2. Move to and from the discharge position.

When the disc device 1B is not used, the disc tray 4 is in a state of being accommodated in the device body 2 (disc loading position). When an eject operation is performed in this state, the disc tray 4 is moved forward by the driving of a motor (not shown) to a position (disc ejection position) protruding outward from the apparatus body 2 and the mechanism unit 22 is lowered ( (See FIG. 7).

When the disc 3 is placed on the disc tray 4 and a loading operation is performed, the disc tray 4 moves rearward to the disc loading position and
The mechanical unit 22 moves up. As a result, the disk clamper 38 is magnetically attracted to the turntable 26,
The optical disk 3 is sandwiched between the disk clamper 38 and the turntable 26, and reproduction by the optical head 27 becomes possible (see FIG. 8).

When an eject operation is performed, the disk device 1
Each of the mechanisms B operates in the reverse order and in the opposite direction to that at the time of loading, and the disc 3 is released from the clamp, placed on the disc tray 4, and ejected.

In such a disc device 1B, the optical head 27 is a horizontal type optical head having a structure in which the reflected light from the optical disc 3 is bent at a right angle by a prism (mirror) and guided to a light receiving element. . Since this horizontal type optical head has a thin thickness of about 1 cm, even if the optical head 27 is located at any position in the radial direction of the disk,
Although the mechanical unit 22 can be moved up and down without any trouble, it is expensive because of the trouble of adjusting the positions of optical elements such as lenses and prisms, and the manufacturing cost of the device increases.

Therefore, the use of a vertical head, which is less expensive than a horizontal head, is being considered. However, since this vertical head is configured to guide the reflected light in the vertical direction from the optical disc 3 to the light receiving element as it is without bending, the thickness thereof is as thick as about 3 cm. Therefore, a design must be made to increase the height H _{0 of the} entire disk device.
On the side of a computer incorporating a disk device, the installation space of the disk device is limited, which is an obstacle to using a vertical head for the disk device.

[0013]

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk device and a head driving method which can use an inexpensive vertical type optical head without increasing the thickness of the disk device. .

[0014]

In order to achieve the above object, a disk device of the present invention comprises a rotation driving means for rotating an optical disk, a vertical type optical head movable in the radial direction of the optical disk, A mechanical unit including the rotation drive means and a base on which the optical head is mounted, a vertical movement mechanism for vertically moving at least one end of the mechanical unit, and an optical disk loading position in association with vertical movement of the vertical movement mechanism. And a disc tray that moves between the optical disc ejection position and a recess for accommodating at least the lower part of the optical head in the vicinity of the rotation driving means, and the disc tray is at the optical disc ejection position. In some cases, the optical head approaches the rotation driving means, and the mechanical unit is lowered,
Thereby, at least the lower portion of the optical head is housed in the recess.

Preferably, the mechanical unit has a chassis which supports one end of the mechanical unit so as to be vertically movable, and the recess can be formed in the chassis.

More preferably, the base may have an opening formed along the moving direction of the optical head, into which the optical head is inserted.

More preferably, the optical head may be housed in the recess without contact.

Further, the head driving method of the present invention comprises a mechanical unit having a rotary driving means for rotationally driving an optical disk and a vertical type optical head capable of approaching and separating from the rotary driving means. In a disc device that is movably installed, when loading and ejecting the optical disc, one end of the mechanical unit is lowered while the optical head is moved to the vicinity of the rotation driving means,
It is characterized in that interference of the optical head is avoided.

[0019]

A disk device according to the present invention comprises a rotation driving means for rotating and driving an optical disk, a vertical type optical head movable in the radial direction of the optical disk, and a base on which the rotation driving means and the optical head are mounted. A mechanical unit, a vertical movement mechanism that vertically moves at least one end of the mechanical unit between a raised position and a lowered position, and an optical disc loading position and an optical disc ejection position in conjunction with the vertical movement of the vertical movement mechanism. And a recess for accommodating the optical head provided in the vicinity of the rotation driving means.

When the disc tray is moved to the loading position or the ejection position, the optical head is moved to a position close to the rotation driving means, and the mechanical unit is lowered in that state. The optical head is of a vertical type and has a relatively large thickness, but at the time of lowering the mechanism unit, at least the lower part of the optical head is housed in the recess, so that the optical head may interfere with the device. To be prevented.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk device according to the present invention and a method of driving a head by the device will be described in detail with reference to the preferred embodiments shown in the accompanying drawings.

FIG. 1 is an exploded perspective view showing an embodiment of a disc device of the present invention, FIG. 2 is a plan view of the disc device shown in FIG. 1, and FIG. 3 is a configuration of a cam wheel in the disc device shown in FIG. 4 is a bottom view showing the configuration of the back surface of the disc tray in the disc device shown in FIG. 1, and FIGS. 5 and 6 are sectional side views of the disc device shown in FIG. 1, respectively.

As shown in FIG. 1, a disc device 1A of the present invention is a device for reproducing an optical disc 3 such as a CD-ROM, and mainly comprises a device body 2 and the device body 2.
It is composed of a disc tray 4 for moving an optical disc which is moved in the front-rear direction (horizontal direction) and is taken in and out.

The apparatus main body 2 includes a bottom plate 11, a main circuit board assembly 12 provided on the bottom plate 11, and a mechanism assembly 1 provided on the main circuit board assembly 12.
3 and a case 14 that covers the upper side of the mechanism assembly 13. The case 14 includes a top plate portion 14a, left and right side plate portions 14b and 14c, a back plate portion 14d, and a front plate portion 1
4e. On the lower surface (inner surface) of the top plate portion 14a, a disk clamper 38 is installed so as to be rotatable coaxially with a turntable 26 described later.

The disc tray 4 is provided on the front plate 14e.
Is formed with a narrow opening 141e. A front bezel 16 is attached to the front plate portion 14e via a frame 15 made of a cushion material such as sponge. The front bezel 16 also has a narrow opening 16a through which the disc tray 4 is inserted and removed.

The mechanism assembly 13 is a substantially container-shaped chassis 2.
It has 0. The chassis 20 is composed of a rectangular, substantially plate-shaped bottom portion 20a, and wall portions 20b provided upright in a U-shape along the left and right sides and the rear edge portion of the bottom portion 20a. A wall portion is not formed on the front bezel 16 side of the chassis 20 and is in an open state, so that the opening 141e is positioned when the chassis 20 is assembled into the case 14.

The chassis 20 includes a mechanical unit 22.
And a vertical movement mechanism 30 are provided. Of these, the mechanism unit 22 is arranged so as to be housed in the vicinity of the central portion of the recessed space 21 formed in the bottom portion 20a of the chassis 20, and the vertical movement mechanism 30 is housed in front of the recessed space 21. It is arranged as follows.

The mechanical unit 22 has a base 23,
The base 23 includes a spindle motor 25 for rotating a turntable, a turntable 26 fixed to a rotation shaft of the spindle motor 25, a vertical optical head (including an actuator) 24, and the optical head 24. An optical head moving mechanism 28 that moves in the radial direction of the optical disc 3 is mounted. The spindle motor 25 and the turntable 26 constitute a rotation driving unit that drives the optical disc 3 to rotate. The turntable 26 includes a permanent magnet that can attract the disc clamper 38. The optical head 24 is a vertical type optical head configured to guide the reflected light from the optical disc 3 to the light receiving element in the vertical direction (direction of the rotation axis of the optical disc 3) as it is without being bent by a mirror or the like. Is about 3 cm.

The optical head moving mechanism 28 includes a forward / reverse rotation motor 28a, a lead screw 28b rotated by the drive of the motor 28a, and a reduction gear train for decelerating the rotation of the motor 28a and transmitting it to the lead screw 28b. 28c, a slider 28e provided with an engaging member 28d that engages with the spiral groove of the lead screw 28b, a guide rod 28g for restricting the moving direction of the slider 28e, and an optical head 24, and is integrated with the slider 28e. And a mounting table 28f that is formed integrally. The lead screw 28b and the guide rod 28g are arranged such that the longitudinal direction thereof is the front-back direction of the disc device 1A.

In such an optical head moving mechanism 28, the engaging member 2 is inserted into the spiral groove of the lead screw 28b.
Since 8d is engaged, when the lead screw 28b rotates in a predetermined direction by driving the motor 28a, the slider 28e moves along the guide bar 28g.
The optical head 24, which is fixed to the mounting table 28f, moves in the radial direction of the optical disc 3 mounted on the disc tray 4 by moving in the front-back direction of A.

The drive of the motor 28a is controlled by the control means (CPU) 50 provided in the main circuit board assembly 12.

The base 23 is supported on the chassis 20 via an insulator 29a made of an elastic material (rubber or the like) at the rear end (the inner side of the apparatus main body 2), and the installation location of the insulator 29a is fixed. It is possible to displace in any direction within the range of elastic deformation of rubber at the center.

An optical head 24 is inserted into the base 23, and an opening 231 extending along the moving direction of the optical head 24 is formed. The optical head 24 moves in the opening 231 by the operation of the optical head moving mechanism 28.

The vertical movement mechanism 30 is a motor (driving source) 3 provided on the front side of the chassis 20 and capable of forward / reverse rotation.
1 and a deceleration mechanism 3 for decelerating and transmitting the rotation of the motor 31.
2, a cam wheel (elevating gear member) 33 that is rotated via the speed reduction mechanism 32, and a base elevating member 35 that is displaced (rotated) as the cam wheel 33 rotates.

The deceleration mechanism 32 has a substantially frustoconical roller 32a fixed to the tip of the rotating shaft of the motor 31, and a wheel 32b having a cap-shaped rubber sheet which is in close contact with the outer peripheral conical surface of the roller 32a. Large gear 3 that meshes with a pinion gear (not shown) provided under the wheel 32b
2c and a small gear 32d coaxially fixed on the upper part of the large gear 32c. The rotation of the motor 31 is reduced by the reduction mechanism 32 at a predetermined reduction ratio and transmitted to the cam wheel 33.

As shown in FIG. 3, the cam wheel 33 is
Lower gear 3 that meshes with the small gear 32d of the reduction mechanism 32
3a and an upper gear 3 that meshes with a rack gear 4b formed on the back surface (lower surface) of the disc tray 4 along the front-rear direction.
3b and. A cam groove 34 is formed along the circumferential direction on the outer periphery of the shaft between the gears 33a and 33b. The cam groove 34 is formed between the lower gear 33a and a lower cam groove 34a formed between the flange 331 and the lower gear 33a formed between the gears 33a and 33b, and between the flange 331 and the upper gear 33b. Upper cam groove 34b,
It is configured with an inclined cam groove 34c that connects both cam grooves 34a and 34b. In this case, the upper cam groove 34b is formed over substantially the entire circumference of the cam wheel 33, and the lower cam groove 34a has a center angle of 10 to 10 on the cam wheel 33.
It is formed in an angle range of about 45 °.

On the other hand, the base elevating member 35 is located between the cam wheel 33 and the base 23, as shown in FIG. The base elevating member 35 is formed by integrally forming a pair of arms 35a and 35b arranged substantially in parallel with each other and a connecting portion 35c connecting their ends, and has a substantially C-shape as a whole. I am doing it. Connection part 3
Shafts 35d and 35e are formed at both ends of the 5c so as to project therefrom, and these shafts 35d and 35e are rotatably supported by the chassis 20. Therefore, the base elevating member 35 rotates about the shafts 35d and 35e, and the arms 35a and 35b also move along with the shafts 35d and 35e.
Rotate around 5e.

Further, on the base elevating member 35, the cam wheel 3 is provided on the side opposite to the extending side of the arms 35a and 35b.
A follower (following member) 36 having a protruding shape that engages with the cam groove 34 of No. 3 is formed in a protruding manner. As shown in FIG. 3, a sphere 361 is formed at the tip of the follower 36, and the sphere 361 is inserted into the cam groove 34.
With the rotation of, the cam groove 34 slides in the cam groove 34.

When the follower 36 is engaged with the upper cam groove 34b, the arms 35a and 35b are attached to the shaft 35.
When the follower 36 engages with the lower cam groove 34a via the inclined cam groove 34c as the cam wheel 33 rotates, the follower 36 engages with the lower cam groove 34a.
The arms 35a and 35b move to positions that are pivoted upward about the shafts 35d and 35e.

Base elevating member 3 constructed as described above
Insulators 29b, 29c attached to connecting portions formed on both front sides of the base 23 are connected to the fifth arms 35a, 35b, respectively. for that reason,
With respect to the base 23, as the arms 35a and 35b of the base elevating member 35 are moved up and down in accordance with the rotation of the cam wheel 33, the front part of the base 23 is located at the upper position with respect to the position of the insulator 29a on the inner side of the apparatus body 2. Moves up and down between the lower position.

Since the disk device 1A has a structure in which the base 23 is supported by the chassis 20 via the three insulators 29a, 29b, 29c, the influence of vibration transmitted from the chassis 20 to the base 23 is minimized. Can be reduced.

The disc tray 4 is, as shown in FIG.
The optical disk 3 has a shallow concave disk mounting portion 4a, and the optical disk 3 is mounted on the disk mounting portion 4a and is conveyed in a state where its position is regulated as desired.

As shown in FIG. 4, a rack gear 4b that meshes with the upper gear 33b of the cam wheel 33 is formed on the back surface of the disc tray 4. As a result, the disc tray 4 moves in the front-back direction with respect to the chassis 20 between the loading position of the optical disc and the ejecting position of the optical disc as the cam wheel 33 rotates. Then, in the loading operation of the optical disc 3, the cam wheel 33 is moved to the position shown in FIG.
The disc tray 4 rotates in the counterclockwise direction, whereby the disc tray 4 moves rearward, and the disc 3 is carried into the apparatus main body 2.

As shown in FIGS. 5 and 6, a concave portion 37 for accommodating the lower portion of the optical head 24 is provided near the spindle motor 25 of the chassis 20. The recess 37 constitutes an escape space for the optical head 24, and the formation position, shape and size (depth, etc.) thereof.
As will be described later, when the optical head 24 comes closest to the spindle motor 25 and the mechanism unit 22 descends to the lowered position, the lower part of the optical head 24 is preferably stored in the recess 37 in a non-contact manner. Is set to.

Further, the disk device 1A includes the optical disk 3
It has an emergency ejection mechanism 40 capable of manually ejecting the optical disc 3 by moving the disc tray 4 when a power failure occurs during the reproduction of the optical disc 3 during the reproduction and the rotation of the optical disc 3 is stopped. .

The emergency discharge mechanism 40 includes a shaft 41 rotatably supported on the front portion of the chassis 20, a substantially frustoconical roller 42 fixed to one end of the shaft 41, and a shaft 41.
And a leaf spring 43 for urging the device toward the front side of the device.

Normally, the shaft 41 is driven by the urging force of the leaf spring 43.
Moves toward the front of the device, the other end of the shaft 41 projects toward the front of the device, and the roller 42 is in a non-contact state with the wheel 32b. It should be noted that the front protruding end of the shaft 41 is formed with a one-letter groove into which a driver (not shown) is inserted.

When the shaft 41 is pushed in against the urging force of the leaf spring 43 by using a driver, the roller 42 moves rearward along with this, and the outer peripheral conical surface thereof has a rubber sheet (conical surface) above the wheel 32b. ) Is crimped to. When the driver manually rotates the shaft 41 in a predetermined direction while maintaining this state, the wheel 32b rotates counterclockwise in FIG. 2, the cam wheel 33 rotates in the same direction, and the disc tray 4 moves forward. . By grasping the front end of the disc tray 4 by hand and pulling it out, the optical disc 3 placed on it can be taken out.

According to the disk device 1A as described above, although the vertical type optical head 24 is used, the total height H ₁ of the disk device 1A is the same as the above-mentioned conventional height H of the disk device 1A. It can be almost equal to ₀ .

Next, the operation of the disk device 1A (head driving method) will be described.

When the disc device 1A is not used, the empty disc tray 4 is in a state of being accommodated in the device body 2 (disc loading position). At this time, the optical head 24 is controlled by the drive control of the motor 28a by the control means 50.
It has been moved to the position closest to the spindle motor 25.

When an eject operation is performed in this state, the motor 31 rotates in a predetermined direction, and the cam wheel 33 rotates counterclockwise in FIG. 2 via the speed reduction mechanism 32. Due to the rotation of the cam wheel 33, the upper gear 33b meshes with the rack gear 4b on the back surface of the disc tray 4, so that the disc tray 4 moves forward and the opening 141 is opened.
After passing through e and 16a, it moves to a position (disc ejection position) protruding outward from the apparatus main body 2.

At the same time, the follower 36 of the base elevating member 35 located in the lower cam groove 34a moves up the inclined cam groove 34c and moves to the upper cam groove 34b. As a result, the follower 36 is displaced upward, the base elevating member 35 rotates about the shafts 35d and 35e, and the arm 35
a and 35b swing downward. This arm 35a, 35
With the swing of b, the front portion of the base 23 rotates about the position of the insulator 29a via the insulators 29b and 29c connected to the respective arms, and the mechanism unit 22 moves to the lowered position.

At this time, as described above, the optical head 2
Since No. 4 has already been moved to the position closest to the spindle motor 25, the lower part of the optical head 24 is housed in the recess 37 as the mechanical unit 22 descends (see FIG. 5). Therefore, the optical head 24 is prevented from interfering (colliding) with the chassis 20 and the like.

When the optical disk 3 is mounted on the disk mounting portion 4a of the disk tray 4 that has been pulled out and a loading operation is performed, the motor 31 rotates in the opposite direction to the above, and the cam wheel 33 via the speed reducing mechanism 32. Rotates clockwise (reverse rotation) in FIG. Along with this, the disc tray 4
Moves rearward, passes through the openings 141e and 16a, and moves to the disc loading position. As a result, the optical disc 3 placed on the disc tray 4 while being positioned is also conveyed to the disc loading position in the apparatus main body 2.

When the reverse rotation of the cam wheel 33 is started, the follower 36 of the base elevating member 35 is also moved.
Moves along the upper cam groove 34b, and when the center of the optical disk 3 approaches the center hub portion 26a of the turntable 26, the follower 36 moves down the inclined cam groove 34c,
It moves to the lower cam groove 34a. As a result, the follower 36 is displaced downward, and the base elevating member 35 moves toward the shaft 35d,
The arm 35a, 35b swings upwards by rotating about 35e. With the swing of the arms 35a and 35b, the front portion of the base 23 is rotated around the position of the insulator 29a via the insulators 29b and 29c connected to the respective arms, and is lifted from the lowered position to the raised position. The mechanical unit 22 is almost horizontal.

As a result, the center hub portion 26a of the turntable 26 is fitted in the center hole 3a of the optical disc 3, and the turntable 26 supports and lifts the central portion of the disc 3. Further, the disc clamper 38 rotatably supported on the lower surface of the top plate portion 14 a of the case 14 is magnetically attracted to the turntable 26, and the optical disc 3 is sandwiched between the disc clamper 38 and the turntable 26.

As the mechanical unit 22 moves up, the lower part of the optical head 24 is detached from the recess 37 and can move in the opening 231 in the radial direction of the optical disk 3 (see FIG. 6).

When the optical disc 3 is mounted at the disc loading position as described above, the spindle motor 25
Is activated and the optical disk 3 rotates at a constant speed. Further, the optical head 24 is moved to a predetermined position by the optical head moving mechanism 28, and the optical head 24 emits light onto the recording surface of the optical disc 3 while performing tracking control and focus control.
Light is received to reproduce the information recorded on the optical disc 3.

When the reproduction is stopped and the eject operation is performed,
First, the optical head 24 is moved to the position closest to the spindle motor 25 by the drive control of the motor 28a by the control means 50. Next, each mechanism of the disc device 1A operates in the same manner as the eject operation described above, and the disc 3 is released from the clamp, placed on the disc tray 4, and ejected.

Although the disk device of the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to this. For example, the concave portion 37 is not limited to the lower portion of the optical head, but most of the concave portion 37. It can be stored. further,
Such a recess is not limited to the bottomed one as shown in the drawing,
It can be replaced with a bottomless one such as an opening or a relief portion having an arbitrary shape.

[0062]

As described above, according to the present invention, since an inexpensive vertical type optical head can be used without increasing the thickness of the disk device, the manufacturing cost of the device is significantly reduced. can do.

Further, in the present invention, the recess for accommodating the lower portion of the optical head is not provided in a wide area, but may be provided in one place with a relatively small area in the vicinity of the rotation driving means. It does not hinder the placement of IC chips and other electronic components on the substrate.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a disk drive according to the present invention.

FIG. 2 is a plan view of the disk device shown in FIG.

3 is a perspective view showing a configuration of a cam wheel in the disc device shown in FIG. 1. FIG.

4 is a bottom view showing the configuration of the back surface of the disc tray in the disc device shown in FIG. 1. FIG.

5 is a cross-sectional side view of the disc device shown in FIG. 1 when an optical disc is ejected.

6 is a cross-sectional side view of the disc device shown in FIG. 1 during reproduction of an optical disc.

FIG. 7 is a side view of a conventional disc device when an optical disc is ejected.

FIG. 8 is a side view of the conventional disc device during optical disc reproduction.

[Explanation of symbols]

 1A, 1B Disc device 2 Device body 3 Optical disc 3a Center hole 4 Disc tray 4a Disc mounting part 4b Rack gear 11 Bottom plate 12 Main circuit board assembly 13 Mechanism assembly 14 Case 14a Top plate part 14b, 14c Side plate part 14d Back plate part 14e Front plate part 141e Opening 15 Frame 16 Front bezel 16a Opening 20 Chassis 20a Bottom part 20b Wall part 21 Recessed part 22 Mechanical unit 23 Base 231 Opening 24 Optical head 25 Spindle motor 26 Turntable 27 Optical head 28 Optical head moving mechanism 28a Motor 28b Lead Screw 28c Reduction gear train 28d Engagement member 28e Slider 28f Mounting table 28g Guide bar 29a, 29b, 29c Insulator 30 Vertical movement mechanism 31 Motor 32 Reduction mechanism 32a Low LA 32b Wheel 32c Large gear 32d Small gear 33 Cam wheel 331 Flange 34a Lower cam groove 34b Upper cam groove 34c Inclined cam groove 35 Base elevating member 35a, 35b Arm 35c Connecting portion 35d, 35e Shaft 36 Follower 361 Sphere 37 Recess 38 Disk Clamper 40 Emergency discharge mechanism 41 Shaft 42 Roller 43 Leaf spring 50 Control means

Claims (5)

[Claims] 1. A mechanical unit comprising: a rotation driving means for rotating and driving an optical disc; a vertical type optical head movable in the radial direction of the optical disc; and a base for mounting the rotation driving means and the optical head. A rotary mechanism for moving at least one end of the mechanical unit up and down, and a disc tray for moving an optical disc loading position and an optical disc ejecting position in association with the vertical movement of the vertical moving mechanism. A concave portion capable of accommodating at least a lower portion of the optical head is provided in the vicinity of the means, and when the disc tray is in the optical disc ejecting position, the optical head approaches the rotation driving means and the mechanism is provided. The unit is in a lowered state, whereby at least the lower part of the optical head is housed in the recess. Disk apparatus according to symptoms. 2. The disk device according to claim 1, further comprising a chassis, one end of which supports the mechanical unit so as to be vertically movable, and the recess is formed in the chassis. 3. The disk device according to claim 1, wherein the base has an opening formed along the moving direction of the optical head and through which the optical head is inserted. 4. The disk device according to claim 1, wherein the optical head is housed in the recess in a non-contact manner. 5. A disk in which a mechanical unit including a rotary drive means for rotationally driving an optical disk and a vertical optical head capable of approaching and separating from the rotary drive means is installed such that one end thereof is vertically movable. In the apparatus, when loading and ejecting the optical disc, one end of the mechanical unit is lowered in a state where the optical head is moved to the vicinity of the rotation driving means to avoid interference of the optical head. How to drive the head.