JP2001052416A - Disk selection type disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk selection type disk device capable of preventing the unexpected protrusion of plural trays or magazines located in a disk loading part into a driving unit. SOLUTION: A regulation wall 11a is provided in the drive base 11 of a driving unit 10. A clamp base 12 is provided with a pulling-in member 35 for pulling in a tray T, and a regulation wall 35b is provided in the pulling-in member 35. When the driving unit 10 is set in a home position, the jumping-out of all the trays inside a magazine M is prevented by the regulation walls 11a and 35b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk selection type disk device, and more particularly to a disk selection type disk device capable of preventing a plurality of trays or disks in a disk installation portion from jumping out to a drive unit side. .

[0002]

2. Description of the Related Art In a disk selection type disk device for a vehicle or the like, a magazine is loaded in a disk installation portion in a housing. In this magazine, a plurality of trays each having a disk mounted thereon are housed so as to be able to be pulled out, or a plurality of disks are housed so as to be able to be taken out without providing a tray.

A drive unit facing the disk installation unit has a rotary drive unit and a head mounted thereon. When the drive unit moves in the direction in which the disks in the disk installation section are arranged, a tray or a disk in the magazine is selected. The selected tray or disk is pulled into the drive unit, the disk is installed in the rotation drive unit and driven to rotate, the signal recorded on the disk is read by the head, or the signal is recorded on the disk by the head. You.

[0004]

However, since the magazine loaded in the disk selection type disk device has a box shape with an opening formed on one side, the magazine is loaded in the disk installation portion of the disk device. In the state,
There is a problem that the tray or the disc is likely to inadvertently project toward the drive unit from the opening.

[0005] For example, when a disk device is packed and shipped in a state where the magazine in which the trays are stored is still loaded in the disk installation section, the trays in the magazine M are subjected to vibration or impact given to the package. It may jump into the drive unit.

In addition, when the vehicle is vibrated in a state where the disk selection type disk device is mounted on an automobile, a tray or a disk in a magazine installed in a disk installation portion is inadvertently installed in a drive unit. May pop out.

In the case where the magazine is loaded with the opening directed forward in the insertion direction, the tray or the disk is likely to jump out of the opening opened forward in the insertion direction due to the impact when the magazine is loaded in the disk installation portion. .

As described above, if the tray or the disk in the disk installation portion is inadvertently protruded into the drive unit, the tray or the disk protruded into the drive unit cannot be taken out unless the device is disassembled, resulting in a serious failure. . Further, the components in the drive unit may be broken by the impact of projecting the tray or the disk, causing a failure or damaging the tray. In addition, if the tray or disk is inadvertently protruded into the drive unit while mounted on an automobile, etc., the tray or disk will bite into the drive unit when the drive unit is moved in order to select a disk, causing a failure. Cause

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a disk selection type disk device in which a plurality of trays or magazines located at a disk installation portion are prevented from being inadvertently projected into a drive unit. It is intended to provide.

[0010]

According to the present invention, there is provided a disk mounting section on which a plurality of disks which can be pulled out together with a tray or without a tray are mounted, a disk rotation driving section and a head opposed to the disk. A drive unit having: and a selection drive unit that moves the drive unit or the disk installation unit in the direction in which the disks are arranged in the disk installation unit so that the selected disk in the disk installation unit faces the drive unit. In the disk selecting type disk device provided with, when the drive unit and the disk installation section face each other in a predetermined positional relationship, a regulating wall that regulates the projection of all the disks in the disk installation section is provided by the drive unit. It is characterized by being provided on the side.

[0011] For example, when the drive unit and the disk installation unit face each other at the initial position (home position),
The regulating wall on the drive unit side faces all trays or disks in the disk installation section. Therefore, it is possible to prevent the tray or the disk in the disk installation portion from protruding into the drive unit due to an impact or the like.

[0012] The disk mounting portion may be loaded with a magazine containing a tray or a magazine having no tray, or may be mounted on a disk mounting portion in a housing without using a magazine. A plurality of discs or cartridges containing discs may be loaded from outside the body one by one. Alternatively, a plurality of trays may be provided in a disk installation section in the housing, and a disk may be inserted into each tray from outside the housing.

The operation of selecting a tray or a disk may be such that the drive unit moves in the direction in which the disks are arranged, or the drive unit is stopped and the disk installation unit having a magazine or the like moves in the direction in which the disks are arranged. It may be something.

[0014] For example, a tray is provided in the disk installation section to be pulled out together with the disk, and the drive unit is provided with a draw-in member for pulling the tray selected from the disk installation section into the drive unit. The retraction member is provided with the regulation wall,
When the drive unit and the disk installation section face each other in the predetermined positional relationship, the retracting member is located on the disk installation section side, and the regulating wall faces a tray in the disk installation section.

In this case, the drive unit includes: a drive base having the rotary drive section and the head;
A clamp base on which a clamper for clamping a disk is supported is provided on the rotation drive unit, and the retraction member is attached to one of the drive base and the clamp base so as to be capable of performing a retraction operation. The drive base and the clamp base face each other at a predetermined interval when the disc installation section faces the predetermined positional relationship, and the restricting wall provided on the drawing-in member causes the drive base and the clamp base to face each other. When the tray is retracted into the drive unit by the retracting member and the drive base and the clamp base approach a distance at which the disc can be clamped, the regulating wall is positioned within the distance from the base. Inserted into a retraction space formed in either the drive base or the clamp base Which is preferable.

In the above structure, when the drive unit and the disk installation section face each other at a home position or the like,
Even if the drive base and the clamp base in the drive unit are separated from each other, the plurality of trays and disks can be prevented from projecting by the regulating wall located therebetween. In addition, the length of the regulating wall between the drive base and the clamp base in the direction in which the disks are arranged can be increased, and the regulating wall can prevent a large number of trays and disks from projecting.

Further, according to the present invention, the driving unit includes:
A drive base having the rotation drive unit and the head, and a clamp base on which a clamper that clamps a disk is supported by the rotation drive unit is provided.At least one of the drive base and the clamp base is provided.
The control wall may be provided so as to face the disk installation portion.

Further, by using both the regulating wall provided on the drive base and the clamp base and the regulating wall provided on the pull-in member, it is possible to regulate the protrusion of all the trays or disks in the disk installation portion. Is also good.

The drive unit and the disk installation section face each other in the predetermined positional relationship, and all the trays or disks in the disk installation section are regulated by the regulating wall. It is preferable that a lock means for locking a relative position with respect to the disk installation portion is provided.

When the lock means is provided, for example, the relative position between the drive unit and the disk installation section facing each other at the home position does not change due to an impact or the like, and the regulating wall faces the tray or the disk in the disk installation section. The condition can be maintained, and the regulating wall does not come off the tray or the disc.

For example, the selection driving means has a switching plate which reciprocates linearly, and a selection hole formed in the switching plate for moving the drive unit in the direction in which the disks are arranged. The selection hole has an oblong hole inclined with respect to both the moving direction of the switching plate and the moving direction of the drive unit, and a step portion provided in the middle or at the end of the oblong hole. A part may be configured as the locking means for stabilizing the drive unit.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing an example of a disk selection type disk apparatus according to the present invention, FIG. 2 is a partial side view showing a state in which a drive unit is located at a home position, and FIG. FIG. 4 is a partial side view showing a state where a selected tray is pulled out, and FIG. 4 is a partial side view showing a state where a disc on a selected tray is clamped.

The housing 1 shown in FIG. 1 shows a state in which a ceiling plate has been removed. Almost half the area in the housing 1 is the disk installation section I, and the other almost half area is the disk selection drive area II.

In the disk installation section I, a loading port 2 is opened in the front side plate 1a of the housing 1. A magazine M can be loaded from the loading port 2 into the disk installation section I. The magazine M is formed of a synthetic resin material in a box shape, and has an opening M1 in a direction perpendicular to the direction in which the magazine M is loaded into the loading port 2. That is, the magazine M is loaded into the disc installation section I in the X direction, but the opening M1 of the magazine M is directed in the Y2 direction orthogonal to the X direction.

A plurality of trays T are stored in the magazine M in an overlapping manner.
It can be pulled out in two directions. A circular depression is formed on the upper surface of the tray T, and a disk D such as a CD or DVD is placed in the depression. Each tray T
Is formed integrally on one side of the X side.

In the disk selection drive area II, a drive unit 10 is provided to be vertically movable. In the drive unit 10, a drive base 11 and a clamp base 12 are provided so as to face each other substantially in parallel. The front and rear side plates of the drive base 11 are formed with bent portions bent downward in the figure, and the guide shafts 13 are attached to the bent portions, respectively. Guide slits extending in the vertical direction are formed in the front and rear side plates 1a and 1b of the housing 1, and the guide shafts 13, 13 are slidably inserted into the respective guide slits. As a result, the drive base 11 is vertically movably supported. Also, as shown in FIGS. 2 and 3,
The distance between the drive base 11 and the clamp base 12 is H1.
Can be connected to each other while maintaining the same, and the connection can be released.

Switching plates 1 are provided on the side plates 1a and 1b of the housing 1.
4 and 15 are provided. The switching plate 14 is formed with a pair of long holes 14a, 14a, and the support shafts 16, 16 fixed to the side plate 1a are inserted through the long holes 14a, 14a. , 16 are slidably supported in the Y direction. The side plate 1b
Similarly, a support shaft is provided, and the switching plate 15 is similarly slidably supported in the Y direction.

The connecting arm 1 is provided on the lower surface of the bottom plate 1c of the housing 1.
7 is rotatably supported by a shaft 21. Both ends of the connecting arm 17 are connected to the switching plates 14 and 15 by connecting pins 18 and 19. One switching plate 1
A rack member 25 is fixed to 5. The bottom plate 1c
A switching motor 26 and a reduction gear train 27 driven by the switching motor 26 are provided on the lower surface of the lower gear, and a pinion gear 27a at the last stage of the reduction gear train 27 is provided.
Are engaged with the rack member 25. The switching plate 14 and the switching plate 1 are driven by the power of the switching motor 26.
5 are driven in directions opposite to each other outside the side plates 1a and 1b.

The switching plate 14 has selection holes 22, 22.
Are formed, and guide shafts 13 provided on the drive base 11 are inserted into the selection holes 22. The selection holes 22, 22 are inclined oblong holes 22b, 2
2b, and the slanted oblong holes 22b, 22b are formed so as to be inclined with respect to both the sliding direction (Y direction) of the switching plate 14 and the moving direction (vertical direction) of the drive unit 10. Have been. Therefore, when the switching plate 14 moves to the Y1 side, the drive unit 10 is lifted, and when the switching plate 14 moves in the Y2 direction, the drive unit 10 is lowered.

The movement of the switching plate 14 causes the drive unit 10 to move in the direction in which the plurality of trays T in the magazine M loaded in the disk installation section I are arranged (vertically).
By this movement, one of the trays T in the magazine M is selected, and the switching plate 14 is stopped in a state where the drive unit 10 faces the selected tray T.

In this embodiment, when the drive unit 10 rises and reaches a predetermined position (home position), the guide shafts 13 and 13
22 are located at step portions 22a, 22a. Guide shaft 1
The positioning of the drive unit 10 at the home position when the external vibration or the like is applied can be prevented from being inadvertently moved by the fact that the third and third members 13 and 13 are located at the step portions 22a and 22a. Here, the home position is a position at which the uppermost tray T in the magazine M is selected, for example. However, the position at which the lowermost tray T is selected may be the home position of the drive unit 10,
Alternatively, the position where none of the trays is selected may be the home position.

The switching plate 15 includes the switching plate 1
4 are provided with selection holes 22, 22 which are inclined in the opposite direction to the selection holes 22, 22 provided in 4. The drive unit 10
Is driven up and down by a selection drive unit composed of both switching plates 14 and 15, and stops at a position where one of the trays T can be selected.

As described above, the guide shafts 13,
13 is provided on the drive base 11 of the drive unit 10. Therefore, the height of the drive base 11 is determined by the selection holes 22 and 22 of the switching plates 14 and 15, and the height of the clamp base 12 connected to the drive base 11 at an interval H1 is also determined. However, the side plates 1a and 1b of the housing 1 have six positioning grooves 1d and 1d, respectively, and the clamping base 12 has the positioning grooves 1d and 1d.
d is provided with a positioning fitting portion 28 that fits into any one of d.

When the height of the drive base 11 is changed by the switching plates 14 and 15 to a height at which one of the trays T can be selected, the positioning fitting portion 28 is inserted into the positioning grooves 1d at that time. The height position of the clamp base 12 is determined by fitting.

Here, when the disk D on the tray T is clamped in the drive unit 10, the positioning fitting portion 28 is fitted into one of the positioning grooves 1d, 1d, and the height position of the clamp base 12 is changed. In the determined state, the connection between the drive base 11 and the clamp base 12 is released. Then, the drive base 11 is further lifted by the switching plates 14 and 15, the distance between the drive base 11 and the clamp base 12 approaches H2, and the disk D on the tray T can be clamped (FIG. 4). reference).

FIG. 2 shows a state in which the drive unit 10 is located at a home position (for example, a position where the uppermost tray T is selected). FIG. 3 shows a state in which the drive unit 10 is moved to any one of the trays (for example, From the third tray) T
Indicates a selected state. 2 and 3, the height of the clamp base 12 is determined by the positioning grooves 1d, 1d.
Reference numeral 1 is slightly away from the clamp base 12, and the facing distance between the drive base 11 and the clamp base 12 is H1. FIG. 4 shows a state in which the disc D on the selected tray T is clamped. In this state, the switching plate 14 is positioned with the clamp base 12 positioned in one of the positioning grooves 1d. The drive base 11 is lifted by the steps 15 and 15, and the distance between the drive base 11 and the clamp base 12 facing each other is reduced to H2.

As shown in FIG. 2 and subsequent figures, the drive base 11 is provided with a rotatable table 31 on its upper surface so as to be rotatable, and a spindle motor 32 for driving the rotary table 31 to rotate on its lower surface. As a result, a rotation drive unit for the disk is formed. In addition, drive base 1
1 is provided with an optical head (not shown) facing the disk D.

The drive base 11 is integrally formed with a regulating wall 11a which is integrally bent downward at a leading end of the disk mounting portion I (a leading end of the Y1 side). As shown in FIG. 2, when the drive unit 10 is located at the home position, the regulating wall 11 a is a lower four-stage tray among the trays T exposed at the opening M <b> 1 of the magazine M. Oppose.

On the lower surface of the clamp base 12, a clamper 33 is rotatably supported. As shown in FIG. 1, a guide groove 12a extending in the Y direction is formed in the clamp base 12, and a drawing member 35 is slidably supported in the guide groove 12a. A retraction arm 36 is provided on the upper surface of the clamp base 12. The retraction arm 36 is rotatably supported by a shaft 37 on the clamp base 12. A long hole 36 a is formed at the tip of the retraction arm 36, and the connecting pin 3 integrally formed on the upper surface of the retraction member 36 is formed.
8 is inserted into the elongated hole 36a.

The retraction arm 36 has a cam hole 36b.
Are formed. A rotating plate 39 is rotatably supported on the upper surface of the clamp base 12, and the rotating plate 39 is rotationally driven by a motor provided on the clamp base 12 or the drive base 11. A drive pin 41 is fixed on the rotating plate 39, and the drive pin 4
1 is inserted into the cam hole 36b. Therefore, when the rotating plate 39 is rotationally driven by the motor, the retraction arm 36 rotates, and the retraction member 35 is moved to Y1-Y.
Driven in two directions.

As shown in FIG. 2 and subsequent figures, the pull-in member 35 is integrally formed with a hook 35a hooked on a hook T1 of each tray T and a regulating wall 35b extending in the direction of the drive base 11. Is formed. As shown in FIG. 2, when the drive unit 10 is located at the home position and the retracting member 35 is moving to the Y1 side, the regulating wall is placed on two trays from the uppermost stage to the next stage in the magazine M. 35b faces each other.

When the distance between the drive base 11 and the clamp base 12 of the drive unit 10 is widened to H1, the distance between the lower end 35b1 of the regulating wall 35b and the drive base 11 is equal to the tray T. Is less than the thickness dimension.

Further, as shown in FIGS. 3 and 4, a retraction space 11b of a notch or hole is formed on the drawing side (Y2 side) of the drive base 11. As shown in FIG. 4, the retracting member 35 moves to the Y2 side, the tray T is retracted in the Y2 direction by the hook 35a of the retracting member 35, and the drive base 11 further rises, and the drive base 11 and the clamp base 12 When the disc D is clamped, the restricting wall 35b of the pull-in member 35 can enter the evacuation space 11b in a state in which the opposing interval H2 is clamped.

Next, the operation of the disk selection type disk device will be described.

The magazine M is loaded from the loading port 2 of the housing 1 into the disk installation section I. At this time, the opening M1 of the magazine M is directed to the drive unit 10 side. In the magazine M in the disk installation section I, all six trays T appear to be able to be pulled out from the opening M1.

In the disk selection drive area II, the drive unit 10 is set at the home position in a state where no disk selection operation or disk drive is performed. The home position in this embodiment is the same as the position where the uppermost tray T in the magazine M can be selected.

At this time, the guide shafts 13, 13 provided on the drive base 11 are connected to the selection holes 22,
22 is located at the step 22a.
The guide shafts 13 are supported by the drive base 11.
Is inadvertently prevented from moving. That is, in this embodiment, the stepped portions 22a of the selection holes 22, 22 are formed.
The lock means for locking the drive unit 10 at a predetermined position (home position) is constituted by the guide shaft 13 and the guide shaft 13. In the locked state by this locking means,
As shown in FIG. 2, the drive base 11 and the clamp base 12 are connected to each other with the opposing interval set to H1 which is apart from each other.

As shown in FIG. 2, in the home position, the regulating wall 11 bent to the drive base 11 is provided.
a is opposed to the four trays T from the bottom up to the fourth stage appearing in the opening M1 of the magazine M, and
5 is opposed to the two trays T from the uppermost stage to the second stage that appear in the opening M1 of the magazine M. Therefore, all trays T
It cannot be inadvertently projected to the drive unit 10 side. Further, since the gap between the lower end 35b1 of the regulating wall 35b and the upper surface of the drive base 11 is smaller than the thickness dimension of the tray T, the tray T does not enter the gap between the regulating wall 35b and the drive base 11.

Therefore, if the drive unit 10 is located at the home position when the tray is not selected or the disk is not driven, even if the vehicle body vibration is applied to the housing 1 even if the magazine is shocked, Tray T in M
Can be prevented from inadvertently protruding to the drive unit 10 side.

When the disk unit is shipped and the magazine M is packed in a state where it is still loaded in the disk installation unit I, if the drive unit 10 is located at the home position, loading and unloading can be performed. When another impact is applied, it is possible to prevent the tray T from inadvertently protruding into the drive unit 10. Moreover, the switching plates 14 and 15
Since the drive unit 10 is positioned and locked by the locking means composed of the step portion 22a of the selection hole 22 and the guide shaft 13, the drive unit 1 is not affected by the impact of loading or the like.
0 does not move from the home position.

Next, in the tray selecting operation, the motor 26
As a result, the switching plate 14 and the switching plate 15 are driven, and the drive unit 10 is moved up and down by the selection holes 22, 22.
One of the trays T in the magazine M is selected. When the drive unit 10 is opposed to the front of the selected tray T, the positioning fitting portion 28 moves to one of the positioning grooves 1d,
1d and the clamp base 12 is positioned.

FIG. 3 shows a state in which the drive unit 10 is stopped, for example, at the position where the third tray T from the top is selected. At this time, the drive base 11 and the clamp base 12 are spaced from each other. It is set to H1 and connected.

When the selection operation is completed and the clamp base 12 is positioned in the positioning grooves 1d, 1d as described above, the rotating plate 39 on the clamp base 12 rotates as shown in FIG. Rotates clockwise, and the retracting member 35 moves in the Y2 direction. Therefore, the hook Ta is hooked by the hook 35a of the pull-in member 35, and the tray T is drawn in the Y2 direction between the drive base 11 and the clamp base 12.

When the retraction is completed, the positioning grooves 1d,
Clamp base 12 whose height is determined by 1d
And the drive base 11 is disconnected. Then, the switching plate 14 is further driven in the Y1 direction, and the switching plate 15 is further driven in the Y2 direction, and the drive base 11 is raised, and as shown in FIG.
1 and the disc D is
And the clamper 33. In this clamp state, the opposing distance between the drive base 11 and the clamp base 12 is reduced to H2. At this time, the lower end 35b1 of the restricting wall 35b formed on the retracting member 35 is moved to the retreat space on the Y2 side of the drive base 11. 11b.

When the drive of the disk is completed, the drive base 11 is lowered, the distance between the drive base 11 and the clamp base 12 is increased to H1, and the retracting member 35 is moved.
Moves in the Y1 direction, and the tray T on which the disc D is placed
Is returned to the magazine M.

When another disk D is selected and driven, the drive unit 10 moves up and down to select a new tray and shifts to the same disk clamping operation as described above. However, if the disc selection drive command is not issued, the drive unit 10 shifts to the home position shown in FIG. 2 again.

In the above embodiment, the retracting member 35 is provided on the clamp base 12 side, but the retracting member 35 is provided on the drive base 11 side,
A regulating wall 35b integral with the retracting member 35 may extend toward the clamp base 12. In this case,
The evacuation space 11b is formed on the clamp base 12 side.

In the home position, only the regulating wall 35b formed on the pull-in member 35 may be configured to face all the trays T in the magazine M. Further, at the home position, the regulation wall 11a formed on the drive base 11 and / or the regulation wall formed on the clamp base 12 may be configured to face all the trays T in the magazine M.

Further, in the present invention, the loading port 2 is formed in the side plate 1e on the Y1 side of the housing 1 shown in FIG.
, The magazine M may be loaded in the Y2 direction. In this case, the magazine M is loaded into the disk installation unit I with the opening M1 oriented in the insertion direction (Y2 direction). At this time, if the drive unit 10 is set to the home position, when the tray T attempts to protrude from the opening M1 due to the impact when the magazine M is loaded in the Y2 direction, the control walls 11a and 35b
Thus, the protrusion of the tray T can be prevented.

In addition, the tray is not provided in the magazine, and the disk is directly inserted into the magazine so as to be able to be pulled out, and the disk in the magazine is pulled out into the drive unit by a drawer provided in a drive unit or the like. It may be something. In this case, the regulation wall 11
In (a), the protrusion of the disk in the magazine M can be restricted, and a restricting wall can be provided on a pull-out member for pulling out the disk.

[0061]

As described above, according to the present invention, it is possible to prevent the tray or the disc set in the disc setting section from inadvertently protruding into the drive unit.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the structure of a disk selection type disk device according to the present invention;

FIG. 2 is a partial side view showing a state where the drive unit is located at a home position.

FIG. 3 is a partial side view showing a state where a disk selected by a retraction member of a drive unit is pulled out;

FIG. 4 is a partial side view showing a state where a disc on a tray T selected and pulled out is clamped;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1d Positioning groove 2 Loading port 10 Drive unit 11 Drive base 11a Restriction wall 12 Drive base 13 Guide shaft 14,15 Switching plate 22 Selection hole 22a Step 22b Inclined long hole 35 Retraction member 35a Hook 35b Restriction wall 36 Retraction arm D Disc M Magazine M1 Opening T Tray T1 Hook

Claims (6)

[Claims] A drive unit having a disk installation unit on which a plurality of disks that can be pulled out with or without a tray are installed, a rotation drive unit for the disk, and a head facing the disk; Selection drive means for moving the unit or the disk installation section in the direction in which the disks are arranged in the disk installation section so that the selected disk in the disk installation section faces the drive unit. In the device, when the drive unit and the disk installation unit face each other in a predetermined positional relationship, a regulating wall that regulates the protrusion of all disks in the disk installation unit is provided on the drive unit side. Characterized disk selection type disk device. 2. The disc installation section is provided with a tray that is pulled out together with the disc, and the drive unit is provided with a draw-in member that draws a tray selected from the disc installation section into the drive unit. The restricting wall is provided on the retracting member, and when the drive unit and the disk installation section face each other in the predetermined positional relationship, the retracting member is positioned on the disk installation section side and the regulation is performed. 2. The disk selection type disk device according to claim 1, wherein a wall faces a tray in the disk installation portion. 3. The drive unit is provided with a drive base having the rotary drive unit and the head, and a clamp base on which a clamper for clamping a disk is supported by the rotary drive unit. The retraction member is movably attached to one of the clamp bases, and when the drive unit and the disk installation portion face each other in the predetermined positional relationship, the drive base and the clamp base are connected to each other. Opposing at a predetermined interval, a regulating wall provided on the retracting member is located within an interval between the drive base and the clamp base, and the tray is retracted into the drive unit by the retracting member, and the When the drive base and the clamp base are close enough to clamp the disc 3. The disk selection type disk device according to claim 2, wherein the restriction wall intervenes in a retreat space formed in one of the drive base and the clamp base. 4. The drive unit includes a drive base having the rotary drive unit and the head, and a clamp base on which a clamper for clamping a disk is supported by the rotary drive unit. 4. The disk selection type disk device according to claim 1, wherein the regulating wall is provided on at least one of the clamp bases and faces the disk installation portion. 5. The drive unit and the disk installation section oppose each other in the predetermined positional relationship, and all the trays or disks in the disk installation section are regulated by the regulation wall. 5. The disk selection type disk device according to claim 1, further comprising a lock means for locking a relative position with respect to the disk installation portion. 6. The selection driving means includes a switching plate that reciprocates linearly, and a selection hole formed in the switching plate for moving the drive unit in a direction in which the disks are arranged. The selection hole has an oblong hole inclined with respect to both the moving direction of the switching plate and the moving direction of the drive unit, and a step portion provided in the middle or at the end of the oblong hole. 6. The disk selection type disk device according to claim 5, wherein a portion serves as said locking means for stabilizing said drive unit.