JPH1040619A - Disk clamping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an entire device without needing any extra height by attaching the control member of a disk clamp to be moved into a recessed part formed in the inner side of a centering section. SOLUTION: A turntable 40 is fixed in the rotary shaft 41A of a spindle motor 41 fixed in the lower surface of a mechanical chassis 42. In order to prevent play or slippage with the lower surface of a disk during disk clamping caused by a disk thickness difference, an annular compression urethane 223 to be compressed and deformed is provided in the peripheral end of the upper surface 40A of the turntable 40. Also, in order to position the disk in a position coaxial to that of the turntable 40, a centering section 40C formed in a rough cylindrical shape is projectingly formed to be engaged with a disk center hole D5 in the upper surface 40A of the turntable 40. A connecting section 40D formed in a gear shaped for its upper surface is projectingly formed to be connected with a stopper shaft 45 in a center shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk clamp apparatus, and more particularly to a disk clamp apparatus in which a plurality of chuck members press a peripheral edge of a center hole of a disk to fix the disk on a turntable.

[0002]

2. Description of the Related Art Conventionally, a disk clamping device having a plurality of chuck members has been proposed in Japanese Utility Model Publication No. Hei 5-31707. This device has a centering portion that projects upward at the center position of the disk mounting surface of the turntable and engages with the center hole of the disk to position the disk, and a radially outward projection of the disk mounting surface at one end. Of the disk positioned between the forward movement position where the disk positioned by the centering portion is pressed against the disk mounting surface by the protrusion and the return position where the protrusion does not protrude from the top surface of the centering portion. A plurality of chuck members that can reciprocate freely through the center hole;
Cam means provided in a disk that is rotatably driven coaxially with the disk table and that supports the other end of the chuck member and controls the movement of the chuck member between the forward and backward positions. And a drive mechanism for rotating and driving the disk, and the disk is fixed on the turntable by rotating the disk to move the chuck member to the forward movement position.

[0003]

However, according to the above-mentioned apparatus, since the disk is disposed between the turntable and the spindle motor, an extra height is required,
There is a drawback that hinders downsizing of the disk reproducing device. In particular, in a changer-type disc reproducing apparatus for reproducing a disc by inserting a disc reproducing mechanism between the discs, the disc has to be moved more and the disc change time has been delayed.

In addition, a mechanism for controlling the position of a control gear supporting a partial gear for fixing the turntable and a gear for rotating the disk has to be separately provided, which has complicated the mechanism.

[0005]

SUMMARY OF THE INVENTION The present invention provides a disk clamping apparatus which solves the above-mentioned problems, and comprises a turntable for supporting a disk, and a projection formed on the turntable and engaged with a center hole of the disk. A substantially cylindrical centering part for positioning the disc by performing the operation, a clamp position for engaging the periphery of the center hole of the positioned disc to clamp the disc on the turntable, and an unclamping position for retracting inside the disc center hole. And a control member disposed in a concave portion formed on the inner surface side of the centering portion, for controlling movement of the chuck member between a clamp position and an unclamping position. You.

[0006]

According to the above-described apparatus of the present invention, the control member rotates within the inner recess of the centering portion, and moves the chuck member between the clamp position and the unclamping position. When the chuck member is at the unclamping position, it retracts inside the disk center hole. When the chuck member is at the clamp position, it engages with the periphery of the center hole of the disk, and clamps the disk on the turntable.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A changer type disk reproducing apparatus employing a disk clamp apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of the disc clamp apparatus 100 of the present invention, and FIG. 2 is a changer-type disc reproducing apparatus 1000 employing the disc clamp apparatus of the present invention.
3 is a top view of the disk reproducing apparatus 1000. FIG.

[0008] The disk reproducing apparatus 1000 has 5
A changer-type disc reproducing apparatus capable of storing a plurality of discs D1 to D5 and enabling selective disc reproduction is configured. Upper hold screw 20A-20
C is rotatably supported on the lower surface of the top holder 10, and is simultaneously rotated and driven by the hold screw driving mechanism M1. As shown in FIGS. 2 and 8, the outer peripheral surfaces of these upper hold screws 20A to 20C support the peripheral edge of the disk, and move the disk vertically by 3 mm.
The spiral guides 21A to 21C of the pitch are formed,
The lower end thereof has a lower hold screw 30A to be described later.
Protrusions 22A to 22C that are fitted to recesses 32A to 32C formed at the upper end of 30C are formed to protrude.

Below the upper hold screws 20A to 20C, lower hold screws 30A to 30C are arranged to face each other. Lower hold screw 30A-30
C is rotatably supported on the upper surface of the bottom holder 11, and spiral guides 31A to 31C continuous with the spiral guides 21A to 21C are formed on the outer peripheral surface thereof.

The disc reproducing mechanism 200 is inserted between the disc D3 supported at the lowest position of the upper hold screws 20A to 20C and the disc D2 supported at the highest position of the lower hold screws 30A to 30C. The top holder 10 and the bottom holder 11 described above are respectively supported by a main chassis (not shown) so as to be vertically movable.
The top holder 10 is guided by the upper screw guide 14A and the guide shaft 13. When the screw guide 14A is rotated by the top holder driving mechanism M2, the top holder 10 has a disk mounting position (FIG. 8) for mounting the lowest supported disk D3 on the turntable, and 5 mm from that position. It moves upward, and moves up and down between an upper retract position (FIG. 10) retracted above the disk reproducing mechanism 200. on the other hand,
The bottom holder 11 is guided by a screw guide 14B (hidden and not visible in the drawing) and a guide shaft 13 arranged below the screw guide 14A. The bottom holder 11 is rotated by the bottom holder driving mechanism M3 to rotate the screw guide 14B, thereby lowering the lower hold screws 30A to 30C.
Is moved to a coupling position (FIG. 8) for coupling with the upper hold screws 20A to 20C brought to the disk mounting position, and 17 mm below that position.
It moves up and down between the downward retracted positions (FIG. 10) retracted below 00.

When the bottom holder 11 is brought to the retracted position, the lower hold screws 30A to 30C
It is locked by a lock mechanism (not shown) and is held at the rotation angle. On the other hand, the upper hold screw 20A ~
20C, the spiral guides 21A to 21C are connected to the lower hold screw 30 by detecting the rotation angle.
The lower hold screws 30A to 30C are connected so as to be continuous with the spiral guides 31A to 31C of A to 30C. In the coupled state shown in FIG.
When the upper hold screws 20A to 20C are rotationally driven by the drive mechanism M1, the peripheral edges of the spiral guides 21A to 2D of the upper hold screws 20A to 20C are displayed.
1C or a lower hold screw 30A-30C guided by a spiral guide 31A-31C,
And up and down. As described above, since the spiral guide is formed at a pitch of 3 mm, the discs D1 to D5 are raised by 3 mm each time the hold screw makes one rotation clockwise as viewed from the top of the apparatus, and the disc below is moved to the disc reproducing position. (Disc D3 position in FIG. 8). Of course, if the hold screw rotates counterclockwise, the disc will descend.

The disc reproducing mechanism 200 has a height such that the upper surface of the turntable 40 (more precisely, the upper surface of the compressed urethane 223) coincides with the lower surface of the disc brought to the reproducing position, and is arranged in the chassis horizontal direction about the shaft 39. It is rotatably supported. The disc reproducing mechanism 200 is driven by the optical mechanism driving mechanism M4, and stops at the stop position (the position indicated by the dotted line in FIG. 3) retracted outside the discs D1 to D5 and the turntable 40.
Is rotated between the rotation center of the disc and the reproduction position (the position indicated by the solid line in FIG. 3) which coincides with the disc center.

As shown in FIG. 1, the turntable 4
Numeral 0 is fixed to the rotating shaft 41A (FIG. 5) of the spindle motor 41 fixed to the lower surface of the mechanical chassis 42. A ring-shaped compressible urethane 223 is attached to the periphery of the upper surface 40A of the turntable 40 in order to prevent rattling at the time of disc clamping due to disc thickness error and slip with the disc lower surface. In order to position the disk coaxially with the turntable 40, a substantially cylindrical centering portion 40C that engages with the disk center hole Ds is formed on the turntable upper surface 40A so as to protrude therefrom.
Coupling part 40D, the upper surface of which is shaped like a tooth, for coupling
Are formed to protrude.

The three chuck members 43 press the periphery of the center hole Ds of the disk, and are inserted into square holes 40 B formed on the turntable 40 in the radial direction.
It is supported rotatably about C. A cam plate (control member) 44 for controlling the movement of the chuck member 43 has a coupling portion 44A having an upper surface formed in a tooth shape so as to be coupled to a drive shaft 46 to be described later, and extends from the peripheral surface thereof.
And a guide portion 44C for guiding the third pin 43B. The cam plate 44 has a connecting portion 40D of the turntable 40 in the connecting portion 44A, and the guide groove 4 of the guide portion 44C.
4B, the pins 43B of the chuck member 43 are respectively inserted into the recesses 4 formed on the inner surface side of the centering portion 40A.
It is rotatably mounted in 4E. The guide groove 44B has a gradually increasing guide radius from the start end 44s to the end 44e, and the guide portion 44C has the chuck member 4 at the start end 44s and the end 44e of the guide groove 44B.
The third pin 43B is elastically clamped to prevent the cam plate 44 from rotating due to vibration or the like.

On the other hand, a stopper shaft 45 which penetrates through the disk spindle hole Ds supported by the upper hold screws 20A to 20C and is connected to the above-described connecting portion 40D is fixed to the lower surface of the top holder 10, and a cam is provided around the stopper shaft 45. A drive shaft 46 connected to the connecting portion 44A of the plate 44 is rotatably mounted. The connecting portion 45A serving as the lower end of the stopper shaft 45 and the connecting portion 46A serving as the lower end of the drive shaft 46 are connected to the connecting portion 40 of the turntable 40 brought to the disc reproducing position.
B and the connecting portion 44A of the cam plate 44, and FIG.
As shown in FIG. 1, when the top holder 10 is lowered to the disk mounting position, the top holder 10 is brought into the coupled state. Connection part 45A
And 40D, the rotation of the turntable 40 is locked, and when the drive shaft 46 is rotationally driven by the cam plate drive mechanism M5 (FIG. 8), the cam plate 4
4 rotates inside the concave portion 40E of the turntable 40.

As shown in FIGS. 4 and 5, the guide groove 4
When the pin 43B is located at the starting end 44s of the 4B, the chuck member 43 is held at the unclamping position where the tip 43A is inside the disk center hole Ds. At this time, the cam plate 44 elastically clamps the pin 43B at its starting end 44s to prevent rotational displacement due to vibration or the like. When the cam plate 44 rotates counterclockwise when viewed from the top of the apparatus, the pin 43B of the chuck member 43 is moved to the guide groove 44.
By being guided by B, the tip 43A rotates in a direction toward the outside of the turntable. As shown in FIGS. 6 and 7, the pin 4 is inserted into the starting end 44s of the guide groove 44B.
When 3B is located, the chuck member 43 has its tip 43A.
Rotates to the clamp position where it engages with the periphery of the center hole Ds of the disk, and clamps the disk on the turntable. Further, the cam plate 44 elastically clamps the pin 43B at the terminal end 44s to prevent a rotational displacement due to vibration or the like.

Next, the above-described disk reproducing apparatus 1000
The operation from the stop state to the reproduction state for reproducing the disk D3 will be described in order with reference to FIGS. In the stop state, the disc reproducing mechanism 100
Has been brought to the stop position, and the cam plate 44
The pin 43B of the chuck member 43 is elastically held at the start end 44A of the guide groove (FIG. 4). Therefore, the chuck member 43 is brought to the unclamping position where the tip end 43A is located inside the disk center hole Ds. On the other hand, the top holder 10 and the bottom holder 11 are brought to a connection position where the upper hold screws 20A to 20C and the lower hold screws 30A to 30C are connected.

When the disk D3 for which reproduction has been instructed has not been brought to the reproduction position, first, the upper holding screws 20A to 20C are driven to rotate by the drive mechanism M1, and the disk D3 is brought to a height position aligned with the reproduction position. Be done. When the disc D3 is aligned with the reproduction position, the upper discs D3 to D5 are moved to the upper hold screws 20A to 2D.
The two discs D1 and D2 supported by the spiral guides 21A to 21C and the lower discs D1 and D2 are supported by the spiral guides 3 of the lower hold screws 30A to 30C.
It will be in the state supported by 1A-31C (FIG. 8).

When the disc D3 instructed to be reproduced is brought to the reproduction position, the screw guide 14A is driven by the drive mechanism M.
The top holder 1 is rotated by the
0 is brought to the upper retreat position 5 mm higher than the disc mounting position (Ref) in FIG. 8 (FIG. 9). Further, when the screw guide 14B is rotationally driven by the driving mechanism M3, the bottom holder 11 is moved to the coupling position (Re).
f) is brought down to the lower retreat position 17 mm lower. As described above, the disks D3 to D5 are spiral guides 21A to 21C of the upper hold screws 20A to 20C.
And the discs D1 and D2 are supported by the spiral guides 31A to 31C of the lower hold screws 30A to 30C, so that an insertion space for the disc reproducing mechanism 200 is formed between the reproducing disc D3 and the disc D2.

Next, by driving the driving mechanism M4, the disc reproducing mechanism 200 is held from the stop position (the dotted line position in FIG. 3) to the reproducing position (the solid line position in FIG. 3) where the rotation center of the turntable 40 and the disc center coincide. (FIG. 10).

Subsequently, the screw guide 14A is rotationally driven by the driving mechanism M2, and the top holder 10 is lowered to the disk mounting position (FIG. 11). Due to this lowering, the disk D3 is placed on the turntable 40, and the lower end 45A of the stopper shaft 45 is connected to the connecting portion 40B of the turntable 40, and the lower end 46 of the drive shaft 46 is
A is connected to the connecting portion 44A of the cam plate 44, respectively.

Next, the drive shaft 46 is driven to rotate by the drive mechanism M5, and the cam plate 44 rotates counterclockwise when viewed from the top of the apparatus. Stopper shaft lower end 45A
Since the turntable 40 is fixed by the connection between the turntable 40 and the turntable connecting portion 40B, only the cam plate 44 rotates in the recess 40E by the rotation of the drive shaft 46. The cam plate 44 guides the pin 43B of the chuck member 43 by the guide groove 44B, and rotates the chuck member 43 in the direction in which the tip 43A faces the outside of the turntable. When the pin 43B reaches the end 44e of the guide groove 44B, the tip 43A of the chuck member 43 engages with the periphery of the disk center hole Ds, and presses and fixes the disk D3 on the turntable 40. Further, the cam plate 44 is provided at the end 44 of the guide groove 44B.
The pin 43B is elastically held at e, and a state in which a rotational displacement due to vibration or the like is prevented is achieved.

Subsequently, the upper holding screws 20A to 20C are turned counterclockwise (disc D3) by the driving mechanism M1.
To D5 downward), and the drive mechanism M2 raises the top holder 10 by one pitch of the spiral guides 21A to 21C, that is, 3 mm (FIG. 12). As the top holder screw is rotated and the top holder 10 is raised, the upper hold screws 20A to 20C are smoothly separated from the peripheral edge of the disk D3.

Further, in order to increase the distance between the disk D3 and the upper hold screws 20A to 20C, the driving mechanism M2
The top holder 10 is lifted by 2 mm to the same height position as the upper retreat position shown in FIG. 10 by the drive (FIG. 13).

With the above operation, the disk D3 is clamped on the turntable 40.
The spindle motor 41 is driven to rotate at a predetermined rotation speed, and the recording information is optically read by the optical head 50. The operation from the reproduction state to the stop state is the reverse of the above-described operation, and a detailed description thereof will be omitted.

The present invention is not limited to the above-described embodiment. For example, according to the above-described embodiment, the chuck member 43 is rotatably mounted on the turntable 40 by the shaft 43C. However, the chuck member 43 may be mounted so as to slide within the square hole 40B in the disk radial direction. Also,
The disk is clamped by providing three chuck members 43, but the number is not limited at all.

Further, although the turntable 40 is fixed by the stopper shaft 45 and the cam plate 44 is driven to rotate by the drive shaft, the cam plate 44 may be fixed and the turntable 40 may be driven to rotate. Also,
Although an example in which the present invention is applied to a changer-type disk reproducing apparatus has been described, it is a matter of course that the present invention may be applied to a single-disk reproducing apparatus that reproduces only a single disk.

[0028]

As described above, according to the disc clamping apparatus of the present invention, the control member is movably mounted in the recess formed on the inner surface side of the centering portion. The height of the disk reproducing device can be made compact without requiring it. Also,
When applied to a changer type disc player,
The disk moving distance for inserting the disk reproducing mechanism can be shortened, and the disk change time is shortened, which is more effective.

Further, when the disc mounting means is at the disc mounting position, the disc table is engaged with the turntable and the cam plate, and the cam plate is driven to rotate relative to the turntable. According to the disk clamp device, it is not necessary to separately provide a mechanism for controlling the position of the control lever as in the related art, and the mechanism can be simplified.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the present disc clamp device 100.

FIG. 2 is a perspective view of a changer-type disc reproducing apparatus 1000 to which the disc clamp apparatus 100 of the present invention is applied.

FIG. 3 is a top view of the changer-type disc reproducing apparatus 1000.

FIG. 4 is a top view for explaining the operation of the disc clamp device 100.

FIG. 5 is a sectional view for explaining the operation of the disc clamp device 100.

FIG. 6 is a top view for explaining the operation of the disc clamp device 100.

FIG. 7 is a cross-sectional view for explaining the operation of the disc clamp device 100.

FIG. 8 is a side view of an essential part for explaining the operation.

FIG. 9 is a side view of a main part for explanation of operation.

FIG. 10 is a side view of a main part for explanation of operation.

FIG. 11 is a side view of an essential part for explaining the operation.

FIG. 12 is a side view of an essential part for explaining the operation.

FIG. 13 is a side view of an essential part for explaining the operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Top holder 11 Bottom holder 20A-20C Upper hold screw 30A-30C Lower hold screw 40 Turntable 40A Top surface 40B Square hole 40C Centering part 40D Joint part 40E Annular concave part 42 Mechanical chassis 43 Chuck member 43A Tip 43B Pin 44 Cam plate 44A Joint Portion 44B Guide groove 44C Guide portion 44D Coupling portion 44E Inner recess 44s Start end 44e End 45 Stopper shaft 45A Coupling portion 46 Drive shaft 46A Coupling portion 100 Disc clamp mechanism 200 Disc playback mechanism D1-D5 Disc Ds Disc center hole M1 Hold screw drive mechanism M2 Top holder drive mechanism M3 Bottom holder drive mechanism M4 Reproduction mechanism drive mechanism M5 Cam plate drive mechanism

Claims (6)

[Claims] 1. A turntable for supporting a disk, a substantially cylindrical centering portion projecting from the turntable and positioning the disk by engaging with a center hole of the disk, and the disk positioned A plurality of chuck members movable between a clamp position for engaging the periphery of the center hole of the disc and clamping the disc on the turntable, and an unclamping position retracted inside the disc center hole; A disk clamp device, comprising: a control member disposed in a concave portion formed on an inner surface side and configured to control movement of the chuck member between the clamp position and the unclamping position. 2. The control member includes a guide groove provided at one end of the chuck member for guiding a pin. The control member elastically clamps the pin at a start end and a terminal end of the guide groove, thereby holding the chuck member. 2. The disk clamping apparatus according to claim 1, wherein the rotating position brought to the clamping position and the rotating position bringing the chuck member to the unclamping position are held. 3. A turntable for supporting a disk, a substantially cylindrical centering portion projecting from the turntable and engaging the center hole of the disk to position the disk, and the positioned disk. A plurality of chuck members movable between a clamp position for engaging the periphery of the center hole of the disc and clamping the disc on the turntable, and an unclamping position retracted inside the disc center hole; A control member disposed in a recess formed on the inner surface side for controlling the movement of the chuck member between the clamp position and the unclamping position; and a disk mounting position for mounting the disk on the turntable. And a disk device movable away from the disk and to a retracted position retracted above the turntable. Mounting means, attached to the disk mounting means, when the disk mounting means is at the disk mounting position, engages the turntable and the control member, the control member relative to the turntable And a driving means for rotationally driving the disc. 4. The control member includes a guide groove provided at one end of the chuck member for guiding a pin, and the pin is elastically clamped at a start end and a terminal end of the guide groove to control the chuck member. 4. A rotating position brought to a clamping position and a rotating position bringing the chuck member to the unclamping position.
The disc clamp device as described in the above. 5. The disk mounting means comprises: a top holder movably supported in a vertical direction; a top holder driving mechanism for vertically moving the top holder; A plurality of hold screws rotatably attached to the top holder, and a hold screw drive mechanism for driving the hold screw to rotate. A disk is placed on the turntable, and the hold screw is rotated once in a direction to transfer the disk downward, and the top holder is moved upward by a pitch distance of the hold screw, and the hold screw is moved. It is special to separate the disc from the above disc. Disk clamping device according to claim 3,. 6. A drive shaft fixed to the top holder and configured to restrict rotation of the turntable, a drive shaft rotatably supported by the stopper shaft and driving the control member to rotate. The disk clamp device according to claim 5, wherein the disk clamp device comprises: