JP3031949B2 - Chucking mechanism for disc-shaped recording media - Google Patents

Description

The present invention relates to an improvement in a chucking mechanism for a disk-shaped recording medium.

[Related Art] In recent years, disc-shaped recording medium reproducing apparatuses have been rapidly spread, and diversification has progressed in response to user requests. For example, a mechanism for automatically loading a disk-shaped recording medium by a driving roller has been proposed. According to such a loading mechanism, excellent operability can be ensured, so that the disc-shaped recording medium reproducing device can be employed in an in-vehicle electronic device or the like.

By the way, in a reproducing apparatus having the above-described loading mechanism, a disc-shaped recording medium chucking mechanism for mounting a horizontally loaded disc-shaped recording medium on a turntable is provided. A conventional example of such a disk-shaped recording medium chucking mechanism will be specifically described with reference to the drawings.

That is, as shown in FIG. 17, a clamper arm 2 that rotates in the vertical direction is disposed above the disc-shaped recording medium reproducing device. At the tip of the clamper arm 2, a clamper ring 1 for pressing the disc-shaped recording medium 3 from above is provided. On the other hand, a turntable 5 is provided below the playback device. That is, the disk holding member is constituted by the pair of turntables and the clamper. At the center of the turntable 5, a sleeve portion 6 protruding upward is provided. On the insertion side (right side in the figure) of the disk-shaped recording medium 3, a guide plate 4a is disposed so as to rotate in the vertical direction, and the drive roller 4 is disposed here. The drive roller 4 supports the disc-shaped recording medium 3 from below, and loads the disc-shaped recording medium 3 above the turntable 5 by its rotation.

The conventional example having the above configuration performs a chucking operation as follows.

That is, when the center hole 3a of the disk-shaped recording medium 3 reaches the center of the turntable 5 by the rotation of the driving roller 4, the clamper arm 2 rotates downward and the clamper ring 1 contacts the upper surface of the disk-shaped recording medium 3. Touch At this time, the guide plate 4a also rotates downward with the rotation of the clamper arm 2. Therefore, the disk-shaped recording medium 3 is smoothly lowered on the turntable 5 by the rotation of the clamper arm 2 while being supported by the drive roller 4. Therefore, the center hole 3a of the disc-shaped recording medium 3 is fitted into the sleeve portion 6, and the disc-shaped recording medium 3 is fixed to the turntable 5. (Fig. 18 → 19
On the other hand, when the disc-shaped recording medium 3 is unloaded, the clamper arm 2 rotates upward, and the clamper ring 1 is released from the disc-shaped recording medium 3 on the turntable 5. At the same time, the guide plate 4a rotates upward, the drive roller 4 reverses, and the disc-shaped recording medium 3 is discharged.

[Problems to be Solved by the Invention] By the way, when the disc-shaped recording medium 3 is loaded and unloaded, a predetermined space is set so that the disc-shaped recording medium 3 can be conveyed in the gap between the clamper ring 1 and the sleeve portion 6. Clearance c is required. Therefore, in the related art, the clearance c between the clamper ring 1 and the turntable 5 is created by the rotation of the clamper arm 2 as described above.

However, the above conventional techniques have the following problems.

That is, the descending stroke of the clamper ring 1 is relatively large because a stroke for fixing the disc-shaped recording medium 3 is required in addition to the descending stroke of the disc-shaped recording medium 3. As a result, the rotation angle of the clamper arm 2 is increased, and the device is correspondingly enlarged in the height direction.

The present invention has been proposed in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a disk-shaped recording medium for reducing the thickness of a device while ensuring smooth loading and unloading operations. The purpose is to provide a chucking mechanism.

[Means for Solving the Problems] According to the present invention, there is provided a disk-shaped recording medium chucking mechanism for chucking a disk by a pair of disk holding members, wherein the upper and lower surfaces provided on one of the disk holding members are provided. A movable sleeve portion, an arm portion removably disposed in a gap between one of the disk holding members and the sleeve portion, and an arm drive mechanism for intermittently operating the arm portion; Comprises an inner sleeve portion, and an outer sleeve portion provided outside the inner sleeve portion and capable of engaging with a center hole of the disc-shaped recording medium. A gap between one of the disk holding members and the sleeve portion When the arm portion is inserted into the arm portion, the sleeve portion is moved to one of the upper and lower sides, and when the inserted arm portion is pulled out, the sleeve portion is moved to the one side. The moved sleeve portion is moved to the other side.

According to a second aspect of the present invention, in the chucking mechanism for a disk-shaped recording medium according to the first aspect, the arm driving mechanism is driven by a driving unit of a pickup driving mechanism.

[Operation] The operation of the present invention having the above-described configuration is as follows.

That is, when loading and unloading the disc-shaped recording medium, the pickup drive mechanism does not operate. At this time, when the arm portion is inserted into or removed from the gap between one of the disk holding members and the sleeve portion by the arm driving mechanism, the sleeve portion is regulated to the lowered position. Therefore, a desired clearance can be secured in the gap between the turntable and the disk-shaped recording medium. Therefore, loading and unloading of the disk-shaped recording medium can be performed smoothly.

On the other hand, when the disc-shaped recording medium is mounted on the turntable, the pickup drive mechanism operates to read the signal of the disc-shaped recording medium. At this time, the arm unit is operated in the direction opposite to the insertion or extraction by the arm driving mechanism operated by the pickup driving mechanism. Therefore, the sleeve portion rises, and particularly, the outer sleeve portion fits into the center hole of the disc-shaped recording medium to accurately position the center. Then, the clamper arm rotates downward, and the clamper ring fixes the disc-shaped recording medium to the turntable.

Therefore, according to the present invention, there is no need to lower the disc-shaped recording medium when reproducing the disc-shaped recording medium. Therefore, the downward stroke of the clamper arm does not need to track the downward movement of the disk-shaped recording medium. As a result, only the descending stroke of the clamper ring is required, and the rotation angle of the clamper arm can be reduced. Further, since the inner sleeve portion and the outer sleeve portion are independently provided to be vertically movable, the outer sleeve portion is particularly moved up and down according to the thickness of the disk-shaped recording medium to be chucked and the inner diameter of the center hole thereof. Thus, while fixing the disc-shaped recording medium on the turntable, the center hole and the outer sleeve portion can be securely engaged.

Embodiment An embodiment of the chucking mechanism for a disk-shaped recording medium according to the present invention as described above will be specifically described with reference to the drawings. The same members as those in the related art are denoted by the same reference numerals, and description thereof is omitted.

First, the structure of the turntable 7 of the present embodiment and each member disposed therein will be described with reference to FIGS.

That is, as shown in FIGS. 1 and 2A and 2B, a concave portion 7a is formed at the center of the turntable 7, and a base portion 7b is protruded from the center of the concave portion 7a. I have.
On the upper surface of the turntable 7, four openings 7c are formed every 90 degrees.

Incidentally, an inner sleeve portion 8 and an outer sleeve portion 9 are provided in the concave portion 7a. Among them, FIG. 3 (A),
The inner sleeve portion 8 shown in (B) is fitted to the base portion 7b, and has four protruding portions 8a rising upward. These protruding portions 8a are installed so as to draw a circle as a whole, and are located corresponding to the openings 7c of the turntable 7. Further, a tapered portion 8b inclined toward the center is provided inside the upper edge portion of the protruding portion 8a. The tapered portion 8b comes into contact with the outer periphery of the clamper ring 1.
In addition, a step 8c protruding outward is provided on the outer side of the upper edge of the protrusion 8a.
Are formed. Further, a contact portion 8d is provided at the upper edge of the bottom surface of the inner sleeve portion 8.

On the other hand, as shown in FIGS. 4 (A) and 4 (B), the outer sleeve portion 9 is
It is mounted in the gap with 7a. In addition, the outer sleeve portion 9
A contact portion 9a is formed in a portion one step lower than the upper surface of the inner sleeve portion 8. The contact portion 9a comes into contact with the step portion 8c of the inner sleeve portion 8 from below. Further, a tapered portion 9b is provided outside the contact portion 9a.

An inner spring 10 and an outer spring 11 are provided inside the inner sleeve portion 8 and the outer sleeve portion 9, and the inner sleeve portion 8 and the outer sleeve portion 9 are always moved upward by the springs 10 and 11. Has been energized.

By the way, in the state shown in FIG. 1, a plate-shaped wedge-shaped arm 12 is provided in a gap between the turntable 7 and the inner sleeve portion 8.
Are arranged. The wedge-shaped arm 12 is inserted into the turntable 7 while being in contact with the contact portion 8d of the inner sleeve portion 8. The wedge-shaped arm 12 is slid horizontally (left and right in the drawing) by an arm drive mechanism installed in the traverse unit 25.

Subsequently, the configuration of each member provided in the traverse unit 25 of the present embodiment will be described.

That is, as shown in FIG. 5, the traverse unit 25 is provided with the turntable 7 and the pickup drive mechanism. The pickup driving mechanism includes a pickup base 13, a lead screw 14, and a thread motor 22. The pickup base 13 has a pickup lens 13a and a contact pin 13b, and is engaged with the lead screw 14. The lead screw 14 is rotated by the driving force of the sled motor 22 so as to move the pickup base 13 in the radial direction of the disk-shaped recording medium 3.

Note that the rotational force of the thread motor 22 is
The transmission system to communicate to 14 has the following configuration. That is,
As shown in FIG. 8, a motor gear 21 is press-fitted into the rotation shaft of the sled motor 22. The motor gear 21 meshes with the worm gear 20. And worm gear 20
Are engaged with the drive gear 14a of the lead screw 14.

The embodiment of the present invention is configured to use the above-described pickup driving mechanism as an arm driving mechanism for driving the wedge-shaped arm 12. Therefore, the power plate 16 and the power arm 17 are used as members for interlocking the wedge-shaped arm 12 and the pickup base 13 at an arbitrary timing.
Are provided in the traverse unit 25.

Of these, the power plate 16 is substantially L-shaped,
The traverse unit 25 is arranged to reciprocate. At this time, the tip of one side edge parallel to the lead screw 14 is located on the movement path of the pickup base 13. A rotatable hold arm 15 is provided at this end. The hold arm 15 is formed with a hook 15a for engaging the contact pin 13b of the pickup base 13. In addition, positioning holes 16a and 16b are formed at the right angle portion and the other edge of the power plate 16 at the tip. Fixing pins 30a and 30b are inserted through the positioning holes 16a and 16b so as to regulate the reciprocation of the power plate 16.
Further, the engaging hole 16c is located close to the positioning hole 16a on the right-angled portion.
Is open.

On the other hand, the power arm 17 is rotatable about a fixed pin 30a as a support shaft, and an engagement pin 17b is provided near the base. The engagement pin 17b is inserted through an engagement hole 16c of the power plate 16. Further, one end of a spring 29 is engaged with the base end side of the power arm 17, and the other end of the spring 29 is engaged with a fixed pin 30b. Therefore, the power arm 17 is always urged clockwise in the figure by the elastic force of the spring 29. Further, since the engaging pin 17b is in contact with the engaging hole 16c, the power plate 16 and the power arm 17 are interlocked. Further, a V-shaped notch 17a is provided at the tip of the power arm 17.

By the way, a semicircular notch is formed at the tip of the wedge-shaped arm 12 so as to be bifurcated, and the tip is inserted into the turntable 7 as described above. A locking pin 12a is provided near the side edge of the wedge-shaped arm 12, and the locking pin 12a is
7a is engaged. On the left and right sides of the side edge of the wedge-shaped arm 12, a rack gear 18 centering on the locking pin 12a and a toothless portion 12b having no gear are provided.

Further, the traverse unit 25 is provided with a rotatable worm wheel 19 sandwiched between the side edge of the wedge-shaped arm 12 and the worm gear 20. At this time, as shown in FIGS. 8 and 9, the worm wheel 19 has a small gear 19a and a large gear 19b. And small gear
19a is in contact with the side edge of the wedge-shaped arm 12, and the large gear 19b meshes with the worm gear 20.

The operation of the present embodiment having the above configuration is as follows.

Play mode: FIGS. 5 and 10 That is, in the play mode, the lead screw 14 rotates by receiving the driving force of the sled motor 22, as shown in FIG. At this time, the pickup base 13 moves on the lead screw 14. Therefore, the power plate
The fixing pins 30a and 30b abut against the ends of the 16 positioning holes 16a and 16b, and the position of the power plate 16 is regulated toward the pickup base 13. Accordingly, the power arm 17 is urged in the clockwise direction in the figure by the elastic force of the spring 29, and the engaging pin 17b contacts the engaging hole 16c of the power plate 16.
At this time, the notch 17a of the power arm 17 regulates the locking pin 12a of the wedge-shaped arm 12 in the lower right direction in the drawing, and the worm wheel 1
The nine small gears 19a are located in the toothless portions 12b of the wedge-shaped arm 12.
Therefore, the rotational force from the thread motor 22 is
The wedge-shaped arm 12 is not inserted between the turntable 7 and the inner sleeve portion 8 without being transmitted to the turntable 12. Therefore,
As shown in FIG. 10, the inner sleeve portion 8 and the outer sleeve portion 9 are pushed up by the inner spring 10 and the outer spring 11 in the turntable 7. Thus, the tapered portion 8b of the inner sleeve portion 8 protruding upward from the opening 7c of the turntable 7 comes into contact with the clamper ring 1 to center the disk-shaped recording medium 3. On the other hand, the tapered portion 9b of the outer sleeve portion 9 which similarly projects is fitted into the center hole 3a of the disc-shaped recording medium 3 to ensure the turntable 7
To be fixed. Incidentally, the thickness of the disk-shaped recording medium 3 shown in FIG.
Also shows the case where the diameter of the center hole 3a in which is inserted is also the maximum value. At this time, the outer sleeve portion 9 sinks most deeply against the elastic force of the outer spring 11. On the other hand, since the position of the inner sleeve portion 8 does not change, the distance between the step 8c of the inner sleeve portion 8 and the contact portion 9a of the outer sleeve portion 9 is the largest. Conversely, the disk-shaped recording medium 3 shown in FIG. 14 shows a case where the thickness is the minimum value of the tolerance and the diameter of the center hole 3a is also the minimum value. In this case, the step portion 8c of the inner sleeve portion 8 and the contact portion 9a of the outer sleeve portion 9 abut.

As described above, according to the present embodiment, regardless of the thickness of the disk-shaped recording medium 3 and the size of the center hole 3a, the disk-shaped recording medium 3 can be securely fixed on the turntable 7 by the outer sleeve portion 9. it can. Therefore, a stable reproduction state of the disk-shaped recording medium 3 can be always ensured.

Unloading mode: Fig. 6 → Fig. 7, Fig. 11 → Fig. 12 The lead screw 14 is driven by the driving force of the sled motor 22.
And the pickup base 13 returns to the end position of the lead screw 14 on the turntable 7 side. At this time, the pickup base 13 presses the power plate 16 downward in FIG. Therefore, the engagement hole 16c pushes the engagement pin 17b,
The power arm 17 rotates counterclockwise in the drawing. Accordingly, the right side edge of the notch 17a of the power arm 17 in the figure pushes the contact pin 12a of the wedge-shaped arm 12, and the wedge-shaped arm 12 is retracted toward the worm wheel 19 (upper left direction in the figure). As a result, the rack gear 18 meshes with the small gear 19a of the worm wheel 19, and the driving force from the thread motor 22 is
1, transmitted to the wedge arm 12 via the worm gear 20. Then, the wedge-shaped arm 12 slides in the upper left direction in FIG. 6, and is inserted into the turntable 7 while being in contact with the tapered portion 8d of the inner sleeve portion 8, as shown in FIG. Therefore, the inner sleeve portion 8 is housed in the recess 7 a of the turntable 7 by the wedge-shaped arm 12. At the same time, the step 8c of the inner sleeve portion 8 pushes down the contact portion 9a of the outer sleeve portion 9, so that the outer sleeve portion 9 is also housed in the recess 7a.
As a result, a predetermined clearance is generated in the gap between the clamp ring 1 and the turntable 7, so that the disc-shaped recording medium 3 is smoothly unloaded. When a switch (not shown) recognizes that the wedge-shaped arm 12 has reached the predetermined position, the thread motor 22 stops. At this time, the contact pin 12a of the wedge-shaped arm 12 abuts on the left edge of the notch 17a in the figure, thereby restricting the rotation of the power arm 17. When the pickup base 13 stops, it has moved to the toothless portion of the lead screw 14. Therefore, even if the lead screw 14 rotates carelessly, the pickup base 13 does not move. In addition, the contact pin 13b of the pick-up pickup arm 13 is locked by the hook 15a of the hold arm 15 that rotates clockwise in FIG. 6, so that the pickup base 13 is pulled into the worm gear 20 more than necessary. Never be.

Loading mode: FIG. 7 → FIG. 5, FIG. 12 → FIG. 10 When the disc-shaped recording medium 3 is loaded in the state shown in FIG. 7 and FIG. Since a predetermined clearance is generated in the gap, the disc-shaped recording medium 3 is smoothly loaded.
Then, when the thread motor 22 rotates in the reverse direction, the wedge-shaped arm 12 slides in the lower right direction in FIG. The sliding movement of the wedge-shaped arm 12 causes the power arm 17 to rotate clockwise in the figure. By the rotation of the power arm 17, the engagement pin 17b pushes the engagement hole 16c of the power plate 16 upward in the drawing. This movement of the power plate 16 causes the hold arm 15 to rotate counterclockwise, and the hook 15a comes off the contact pin 13b of the pickup base 13. Further, the power plate 16 presses the pickup base 13, which has been missing teeth, to a position where the lead screw 14 meshes with the gear. At this time, the lead screw 14 is being rotated by the thread motor 22, and the pickup base 13 meshing with the lead screw 14 can move. In the play mode, as described above, the power arm 17 is urged in the clockwise direction in the figure by the spring 29, and the position of the power arm 17 restricts the missing tooth portion 12b of the wedge-shaped arm 12 to the worm wheel 1.
Holds in contact with 9

In the present embodiment as described above, the sleeve portions 8 and 9 rise in the play mode, and conversely descend in the loading and unloading modes.
There is no need to lower the disk-shaped recording medium 3 to the turntable 7. Therefore, the descending stroke of the clamper arm 2 only needs to be the descending stroke of the clamper ring 1. Therefore, the rotation angle of the clamper arm 2 can be reduced, and the device can be made thinner. As a result, it is possible to increase the number of installations even for a device having a large restriction in the height direction such as an in-vehicle electronic device, and it is possible to easily deploy the models.

Moreover, the following points can be raised as important functions and effects of this embodiment. That is, since the pickup drive mechanism is used as the drive mechanism of the wedge-shaped arm 12, the space can be improved, and it is not necessary to use an expensive member such as a plunger, so that the cost can be reduced.

The chucking mechanism for a disk-shaped recording medium according to the present invention includes the following other embodiments.

That is, as shown in FIG. 15, similar to the above-described embodiment,
The worm gear 20 and the turntable 7 are arranged on the traverse unit 25. At this time, the power plate 31 that moves back and forth is engaged with the worm gear 20. The power plate 31 is a pressing portion protruding toward the turntable 7 side.
31a. When the power plate 31 is engaged with and engaged with the worm gear 20, the rotation of the worm gear 20 causes the power plate 31 to move forward (upward in the drawing).

Further, a power arm 32 is provided adjacent to the power plate 31. The power arm 32 is rotatable about a support shaft 32 a, and the distal end is pressed by a pressing portion 31 a of the power plate 31. A reversing spring 33 is attached to the base end.

On the other hand, a wedge-shaped arm 34 is provided near the turntable 7. The wedge-shaped arm 34 is slidable so that the tip thereof is inserted into the turntable 7, similarly to the wedge-shaped arm 12 of the above embodiment. Also, wedge-shaped arm
The base end of 34 is engaged with the front end of the power arm 32. Further, on the side edge of the wedge-shaped arm 34, a rack gear 35 is formed on the base end side, and a toothless portion 34a is formed on the tip end side. The wedge-shaped arm 34 has a vertically long guide groove 37 formed therein. Two guide pins 38a and 38b are inserted in the front and rear of the guide groove 37. Of these, the front guide pin 38a regulates the retreat position of the wedge arm 34, while the rear guide pin 38b regulates the forward position of the wedge arm 34.

A rotatable drive gear 36 is engaged with the side edge of the wedge-shaped arm 34. This drive gear 36 is a rack gear 35
, So that the rotational force of the drive gear 36 is transmitted to the wedge-shaped arm 34.

The operation of the embodiment having the above configuration is as follows.

That is, the state of FIG. 15 shows the play mode. At this time, the power plate 31 is engaged with and engaged with the worm gear 20. The power arm 32 is urged by a reversing spring 33 in a counterclockwise direction in the figure. On the other hand, the drive gear 36 is in contact with the toothless portion 34a of the wedge-shaped arm 34. Therefore, the rotational force of the drive gear 36 is not transmitted to the wedge-shaped arm 34, the wedge-shaped arm 34 does not slide, and the retracted position of the wedge-shaped arm 34 is regulated by the guide pin 38a. As a result, the wedge-shaped arm 34 does not pass through the turntable 7 and the sleeve portion (not shown) in the turntable 7 projects upward, thereby securely fixing the disc-shaped recording medium 3 to the turntable 7. be able to.

On the other hand, the state in FIG. 16 shows the loading mode and the unloading mode. At this time, the power plate 31 advances by the rotation of the worm gear 20, and the pressing portion
31a pushes the tip of power arm 32 forward. For that reason,
The power arm 32 rotates clockwise in the drawing. As a result, the reversing spring 33 at the base end of the power arm 32 moves to the left in the drawing, and urges the power arm 32 in the clockwise direction in the drawing. On the other hand, the wedge-shaped arm 34 on the tip end side is pressed forward, so that the drive gear 36 meshes with the rack gear 35. Accordingly, the wedge-shaped arm 34 moves forward by receiving the rotational force of the drive gear 36, and the distal end portion is inserted into the turntable 7. As a result, the sleeve portion (not shown) in the turntable 7 descends, and the transport space for the disk-shaped recording medium 3 can be reliably secured. The position of the advance of the wedge-shaped arm 34 is restricted by the guide pin 38b abutting on the guide groove 37.

According to the other embodiment as described above, similarly to the above-described embodiment, it is possible to improve the thickness of the device.

Further, the present invention is not limited to the above-described embodiment. For example, the wedge-shaped arm may be provided so as to be inserted into and removed from the lower surface of the sleeve portion instead of the upper surface as in the above-described embodiment. In this case, when the wedge-shaped arm is inserted below the sleeve portion, the sleeve portion is pushed upward, while when the wedge-shaped arm is separated from the sleeve portion, the sleeve portion is lowered by its own weight. Therefore, there is no need to provide a spring for urging the sleeve portion upward, and the number of components can be reduced. Furthermore, the shape and size of each member or the drive source of the arm can be appropriately selected.

Also, instead of lowering the clamper arm, the entire traverse unit is raised to chuck the disk-shaped recording medium, and the clearance between the disk-shaped recording medium and the clamper arm is reduced to further reduce the thickness. It is also possible.

[Effects of the Invention] As described above, according to the present invention, a vertically movable sleeve portion is provided in a turntable, and an arm portion which can be inserted and removed is provided in a gap between the sleeve portion and the turntable. In addition, with a simple configuration in which an arm driving mechanism for intermittently operating the arm unit by the pickup driving unit is installed, when the arm unit is inserted into or removed from the gap between one of the disk holding members and the sleeve unit, the sleeve is removed. Because the part descends, a desired clearance can be secured in the gap between the clamper ring and the turntable, the disk-shaped recording medium can be reliably loaded and unloaded, and the arm part is used when reproducing the disk-shaped recording medium. Is moved in the opposite direction to that described above, so that the sleeve portion rises to accurately turn the disk-shaped recording medium. Since the angle of rotation of the clamper arm is reduced, the thickness of the device is greatly reduced, and the pickup drive mechanism is used as the drive mechanism of the arm, which improves space and Since it is not necessary to use an expensive member such as a plunger, it is possible to provide a chucking mechanism for a disc-shaped recording medium capable of greatly reducing costs.

In addition, since the inner sleeve portion and the outer sleeve portion are each independently provided so as to be vertically movable independently, the outer sleeve portion can be particularly vertically moved according to the thickness of the disk-shaped recording medium to be chucked and the inner diameter of the center hole thereof. Thus, the center hole and the outer sleeve portion can be securely engaged with each other while fixing the disc-shaped recording medium on the turntable. Therefore, regardless of the thickness of the disc-shaped recording medium and the size of the center hole, the disc-shaped recording medium can be fixed on the turntable, and a stable reproduction state can always be ensured.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a turntable showing one embodiment of the present invention, FIG. 2 is a turntable of this embodiment, FIG. 3 is an inner sleeve part of this embodiment, and FIG. 2 to 4, (A) is a plan view, and (B) is a side sectional view. FIGS. 5 to 7 show plan views of the traverse unit of the present embodiment. FIG. 5 shows a play mode, FIG. 6 shows an unloading mode, and FIG. 7 shows a loading mode. 8 and 9 are a plan view and a side view showing a transmission system of the drive mechanism of the wedge-shaped arm of the present embodiment. 10 to 12 are side sectional views of the turntable of the present embodiment. FIG. 10 shows a play mode, FIG. 11 shows an unloading mode, and FIG. 12 shows a loading mode. FIGS. 13 and 14 are side sectional views of the play mode in the present embodiment, FIG. 13 is a side sectional view of the play mode of the thickness tolerance of the disc-shaped recording medium and the maximum value of the center hole, and FIG. FIG. 4 is a side sectional view of a play mode in which the thickness tolerance of the disc-shaped recording medium and the minimum value of the center hole are set. FIG. 15 and FIG. 16 are plan views of a main part showing another embodiment of the present invention. FIG. 15 shows a loading or unloading mode, and FIG. 16 shows a playing mode. FIG. 17 is a side view of a conventional example, and FIGS. 18 and 19 are side views of main parts of the conventional example. 1 ... Clamper ring, 2 ... Clamper arm, 3
...... Disc-shaped recording medium, 4 ... Drive roller, 5 ... Turntable, 6 ... Sleeve, 7 ... Turntable,
8 inner sleeve part 9 outer sleeve part 10
Inner spring, 11 ... Outer spring, 12 ... Wedge arm, 13 ... Pickup base, 14 ... Lead screw, 15 ... Hold arm, 16 ... Power plate,
17 ... Power arm, 18 ... Rack gear, 19 ... Worm wheel, 20 ... Worm gear, 21 ... Motor gear,
22 …… Thread motor, 25 …… Traverse unit, 29
... spring, 30 ... fixed pin, 31 ... power plate, 32 ... power arm, 33 ... reversing spring, 34 ...
... wedge arm, 35 ... rack gear, 36 ... drive gear, 37
…… Guide groove, 38 …… Guide pin.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-226469 (JP, A) JP-A-4-6844 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 17/028-17/035 G11B 17/04

Claims (2)

(57) [Claims] 1. A disk-shaped recording medium chucking mechanism for chucking a disk by a pair of disk holding members, comprising: a vertically movable sleeve portion provided on one of the disk holding members; and one of the disk holding members. And an arm drive mechanism for intermittently operating the arm portion. The sleeve portion includes an inner sleeve portion, and an outer side of the inner sleeve portion. And an outer sleeve portion that is provided on the disk-shaped recording medium and is engageable with the center hole of the disc-shaped recording medium. When the arm portion is inserted into a gap between one of the disk holding members and the sleeve portion, the sleeve portion Is moved to one of the upper and lower sides, and when the inserted arm portion is pulled out, the sleeve portion moved to the one side moves to the other side. Chucking mechanism of the disc-shaped recording medium which can be characterized to be. 2. The chucking mechanism for a disk-shaped recording medium according to claim 1, wherein said arm driving mechanism is driven by a driving section of a pickup driving mechanism.