JP2006302384A - Optical disk reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk reproducing apparatus which can stably reproduce large diameter and small diameter disks. <P>SOLUTION: This apparatus has: a stopper 10 which has an abutting section 12 in which a conveyance roller and a periphery of a disk in feeding direction contacts and supported movably in forward and backward direction; a stopper arm 20 which is supported rotatably centering around a pivot 3, and engaged with the stopper 10; a selection arm 30 having an abutting section 33 extending therethrough forward and backward near the inside of one side face and abutting the side periphery of disk, and supported by the arm 20 rotatably centering around the pivot 22 of a back edge section; a cam slider 40 which is supported laterally movable and having a cam groove 41 engaged with a convex axis 34 at a front edge section of the arm 30; a gear 52 which is engaged with a rack 45 and moves the slider 40; a spring 50 which energizes the arm 20; and a spring 51 which energizes the arm 30. The cam groove 41 contains; a base groove 42 extending therethrough right and left; a cam groove 43 for small diameter disk which starts to extend from inside edge of the groove 42; and cam groove 44 for large diameter disk which starts to extend from an outside edge of the groove 42. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an optical disk reproducing apparatus that reproduces information recorded on an optical disk such as a CD or a DVD, and more particularly, to a slot-in type optical disk reproducing apparatus that can handle optical disks of two types of large and small diameters.

In general, in an optical disc reproducing apparatus, information on the recording surface is obtained by rotating the optical disc clamped at a specified loading position, emitting laser light to the recording surface of the optical disc, and receiving the laser light reflected by the recording surface. , And playback is performed. In particular, in the slot-in type optical disk reproducing apparatus, loading is performed such that the optical disk inserted from the opening on the front surface is guided to a predetermined loading position, that is, a clamp position, during the driving related to such an actual reproducing operation. The loading operation is executed by the disk transport mechanism. Note that the slot-in type optical disk reproducing apparatus here is generally employed as an optical disk reproducing apparatus for car audio, portable or home use.

By the way, commercially available optical discs are standardized in two types of diameters, one of which is a large-diameter optical disc having a diameter of 12 cm (hereinafter sometimes referred to as “large-diameter disc”).
The other is a small-diameter optical disk having a diameter of 8 cm (hereinafter sometimes referred to as “small-diameter disk”). As recent optical disk reproducing apparatuses, two types of optical disks having different diameters can be loaded by one apparatus, regardless of whether the disk is a large diameter disk or a small diameter disk. Some have a disk transport mechanism that can guide them to a specified loading position.

A conventional example of such a disk transport mechanism will be described continuously. For example, the disk transport mechanism described in Patent Document 1 includes a transport roller, a disk stopper, a stopper arm, a lock arm, and a front arm as main components. The transport roller is disposed in the vicinity of the inner side of the front surface of the chassis constituting the outer shape of the optical disk reproducing device, and plays a role of feeding the optical disk inserted from the front opening toward the rear surface.

The disc stopper has a pair of abutting portions on the left and right sides where the outer periphery in the feeding direction of the optical disc abuts in the process of feeding the optical disc, and is supported so as to be movable in the front-rear direction. The stopper arm is supported so as to be rotatable about a support shaft, and has an elongated hole in which the convex shaft of the disk stopper engages at the inner end. The lock arm is supported so that it can move a little in the left-right direction and can be pivoted in a state where it partially overlaps the stopper arm, and has a convex shaft that engages with the cam groove at the center of the stopper arm at the inner end. ing. The stopper arm here is the first between the lock arm
The disk stopper is urged by the tension coil spring in such a direction as to move forward. Furthermore, the outer end of the lock arm is biased forward by the second tension coil spring.

The front arm extends back and forth in the vicinity of the inner side of one of the left and right side surfaces, and the rear end is arranged outside the outer end of the lock arm, with the central support shaft at the center. The front end portion has a contact portion that is rotatably supported by which the outer periphery of the side of the optical disc contacts in the process of feeding the optical disc. The front arm is biased inward by a third tension coil spring inward.

Here, the cam groove of the stopper arm with which the convex shaft of the lock arm engages includes a base groove extending in the front-rear direction. Further, it includes a small-diameter disk locking groove formed at the rear end of the base groove and into which the convex shaft is fitted while receiving the restoring force of the first tension coil spring when the small-diameter disk is fed. Further, it includes a large-diameter disk locking groove which is formed at the front end of the base groove and into which the convex shaft fits while receiving the restoring force of the first tension coil spring when the large-diameter disk is fed. In the initial state, the convex shaft of the lock arm is fitted into the small-diameter disk locking groove, so that the stopper arm and the lock arm are locked to each other.

Under such a configuration, when a small-diameter disk is inserted, the small-diameter disk is fed by the conveyance roller. Then, first, the outer periphery in the feeding direction (traveling direction) of the small-diameter disk comes into contact with the contact portion of the disk stopper, and the disk stopper is pushed backward together with the small-diameter disk. In response to this, the stopper arm engaged with the convex shaft of the disk stopper through the elongated hole rotates. At this time, the convex axis of the lock arm is still fitted in the small-diameter disk locking groove of the stopper arm, and the lock arm rotates integrally with the stopper arm while being locked to each other. When the lock arm rotates by a predetermined angle, the drive unit on which the turntable, the optical head, etc. are mounted starts to rise.

Then, almost as soon as the center of the small-diameter disk reaches the center of the loading position, the drive unit is lifted and the small-diameter disk is clamped. Thereafter, the stopper arm is further rotated together with the lock arm in response to the restoring force of the second tension coil spring, and in response to this, the disk stopper is moved a little rearward, and the contact portion of the disk stopper becomes the small diameter disk. Away from the perimeter of This completes the loading operation of the small-diameter disk.

On the other hand, when a large-diameter disk is inserted, the large-diameter disk is fed by a transport roller. Then, first, the outer periphery on the side of the large-diameter disk comes into contact with the contact portion of the front arm, and the front arm of the front arm rotates as it is outward. Accordingly, the rear end portion of the front arm comes into contact with the outer end portion of the lock arm, and the lock arm moves a little as it is. As a result, the convex shaft of the lock arm is disengaged from the small-diameter disk locking groove of the stopper arm, and the lock arm and the stopper arm are unlocked from each other.

On the other hand, the outer circumference in the feeding direction (traveling direction) of the large-diameter disk contacts the contact portion of the disk stopper, and the disk stopper is pushed backward together with the large-diameter disk. In response to this, the stopper arm engaged with the convex shaft of the disk stopper through the elongated hole rotates. At this time, since the lock arm and the stopper arm are unlocked from each other, first, the stopper arm rotates independently while the convex shaft of the lock arm is guided by the base groove of the stopper arm.

When the stopper arm rotates until the convex axis of the lock arm reaches the front end of the base groove of the stopper arm, the convex axis is fitted into the large-diameter disk locking groove of the stopper arm, and the stopper arm and the lock arm are mutually connected. It becomes locked. This time, the lock arm rotates integrally with the stopper arm in a locked state. When the lock arm rotates by a predetermined angle, the drive unit starts to rise.

Then, almost as soon as the center of the large-diameter disk reaches the center of the loading position, the drive unit is lifted and the large-diameter disk is clamped. Thereafter, the stopper arm is further rotated together with the lock arm in response to the restoring force of the second tension coil spring, and accordingly, the disk stopper moves slightly backward, and the contact portion of the disk stopper has a large diameter. Move away from the outer circumference of the disc. This completes the loading operation of the large-diameter disk.

In this way, each of the small-diameter disk and the large-diameter disk having different diameters can be guided to the specified loading position and reproduced.
Japanese Unexamined Patent Publication No. 6-44660

However, in the above-described conventional optical disk reproducing device, when a large impact is received from outside during reproduction of the large-diameter disk, the convex axis of the lock arm is momentarily detached from the large-diameter disk locking groove of the stopper arm. May end up. In this case, since the mutual locking of the lock arm and the stopper arm is momentarily released, the stopper arm receives the restoring force of the first tension coil spring, and the convex axis of the lock arm is the stopper. While being guided to the locking groove for the small-diameter disk along the base groove of the arm, it rotates independently. In response to this, the disk stopper moves forward.

Then, the abutting portion of the disc stopper that has moved forward abuts on the outer periphery of the rotating large-diameter disc that is being reproduced, which causes a problem that reproduction becomes impossible. Such a problem that occurs during reproduction of a large-diameter disk is particularly noticeable in a car audio or portable optical disk reproducing apparatus that is subject to external shocks.

During reproduction of a small-diameter disk, even if the convex axis of the lock arm is temporarily disengaged from the small-diameter disk locking groove of the stopper arm, the convex force is restored by the restoring force of the first tension coil spring received by the stopper arm. The shaft again fits into the small diameter disk locking groove. Therefore, for a small-diameter disk, the stopper arm does not rotate independently during reproduction, and of course, the disk stopper does not move forward, and can be reproduced stably.

Accordingly, the present invention has been made in view of the above problems, and provides a slot-in type optical disc reproducing apparatus capable of stably reproducing both large-diameter and small-diameter optical discs even when an external shock is received. It is intended to provide.

In order to achieve the above object, an optical disk reproducing apparatus according to the present invention includes the following points in an optical disk reproducing apparatus provided with a disk transport mechanism for guiding a small-diameter or large-diameter optical disk inserted from an opening on the front surface to a specified loading position. Features. The disk transport mechanism includes a transport roller, a disk stopper, a stopper arm, a select arm, a cam slider, a drive gear, a torsion coil spring, and a tension coil spring. The transport roller is disposed near the inside of the front surface and plays a role of feeding the optical disc. The disk stopper
In the process of feeding the optical disc, the optical disc has a pair of abutting portions on the left and right sides where the outer circumference in the feeding direction abuts and is supported so as to be movable in the front-rear direction. The stopper arm is supported so as to be rotatable about a support shaft, and has an elongated hole with which the convex shaft of the disk stopper engages at the inner end. The select arm extends back and forth in the vicinity of the inside of one side of the left and right sides,
While the optical disc is being fed, it has a contact portion with which the outer periphery of the side of the optical disc comes into contact, and is supported rotatably on the outer end portion of the stopper arm around the support shaft of the rear end portion. . The cam slider is supported so as to be movable in the left-right direction in the vicinity of the inside of the front surface, and has a cam groove that engages with the convex shaft at the front end of the select arm. The drive gear meshes with the rack of the cam slider from the vicinity of one moving end of the cam slider to the vicinity of the other moving end and plays a role of moving the cam slider. The torsion coil spring biases the stopper arm in such a direction that the disk stopper moves forward. The tension coil spring biases the select arm inward. The cam groove includes a base groove extending left and right. Furthermore, a small-diameter disk cam groove is provided that extends from the inner end of the base groove and guides the convex shaft of the select arm when the small-diameter optical disk is fed. Furthermore, a cam groove for a large-diameter disk that extends from the outer end of the base groove and guides the convex shaft of the select arm when the large-diameter optical disk is fed.

With such a configuration, during playback of a small-diameter disk or a large-diameter disk, the position of the disk stopper is the engagement between the convex shaft of the select arm and the cam groove for the small-diameter disk or the cam groove for the large-diameter disk of the cam slider. Although the movement of the cam slider is substantially limited by the meshing between the rack and the drive gear, the convex shaft is not limited to the cam groove for the small-diameter disk or the large-diameter. There will be no detachment from the end of the disk cam groove. In other words, the position of the disk stopper during playback is also located at a position where the abutting portion is separated from the outer periphery of the small diameter disk or the large diameter disk, and does not contact each other.

An optical disk reproducing apparatus according to the present invention for achieving the above object is an optical disk reproducing apparatus provided with a disk transport mechanism for guiding a small-diameter or large-diameter optical disk inserted from an opening on the front surface to a specified loading position. Features a point. The disk transport mechanism includes a transport roller, a disk stopper, a stopper arm, a select arm, a cam slider, a drive gear, a first elastic member, and a second elastic member. The transport roller
It is disposed near the inside of the front surface and plays a role of feeding the optical disc. The disk stopper has a pair of contact portions on the left and right sides where the outer periphery of the optical disk in contact with the optical disk is in the process of being fed, and is supported so as to be movable in the front-rear direction. Stopper arm
The disk stopper is supported so as to be rotatable about a support shaft, and has a slot that engages with the convex shaft of the disk stopper. The select arm extends back and forth in the vicinity of the inner side of one of the left and right side surfaces, and has a contact portion with which the outer periphery of the side of the optical disk contacts in the process of feeding the optical disk, Is supported by the stopper arm so as to be rotatable about the support shaft. The cam slider is supported so as to be movable in the left-right direction in the vicinity of the inside of the front surface, and has a cam groove that engages with the convex shaft at the front end of the select arm. The drive gear meshes with the rack of the cam slider from the vicinity of one moving end of the cam slider to the vicinity of the other moving end and plays a role of moving the cam slider. The first elastic member biases the stopper arm in such a direction that the disk stopper moves forward. The second elastic member biases the select arm inward. The cam groove includes a base groove extending left and right. Furthermore, a small-diameter disk cam groove is provided that extends from the inner end of the base groove and guides the convex shaft of the select arm when the small-diameter optical disk is fed. Furthermore, a cam groove for a large-diameter disk that extends from the outer end of the base groove and guides the convex shaft of the select arm when the large-diameter optical disk is fed.

Even in such a configuration, during playback of a small-diameter disk or a large-diameter disk, the position of the disk stopper is the relationship between the convex shaft of the select arm and the cam groove for the small-diameter disk or the cam groove for the large-diameter disk of the cam slider. Although the movement of the cam slider is substantially limited by the meshing between the rack and the drive gear, the convex shaft is not affected by the cam groove for the small-diameter disk or large There is no detachment from the end of the cam groove for the radial disk. In other words, the position of the disk stopper during playback is also located at a position where the abutting portion is separated from the outer periphery of the small diameter disk or the large diameter disk, and does not contact each other.

Here, considering practicality, it is preferable that the first elastic member is a torsion coil spring. The second elastic member is preferably a tension coil spring.

According to the optical disk reproducing apparatus of the present invention, even if an inadvertent impact is applied from the outside during reproduction, both the small-diameter disk and the large-diameter disk can be stably reproduced.

Hereinafter, an optical disk reproducing apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. 1 to 10 are top views that pass through the inside of an optical disk reproducing apparatus according to an embodiment of the present invention. In particular, FIG. 1 shows an initial state before loading of the optical disk. 2 to 4 show one state during loading of a small-diameter disk in this order, and FIG. 5 shows a state where loading of the small-diameter disk is completed. FIGS. 6 to 9 show one state during loading of the large-diameter disk in this order, and FIG. 10 shows the loading completion state of the large-diameter disk.

The disk transport mechanism in the optical disk reproducing apparatus of this embodiment includes a transport roller (not shown), a disk stopper 10, a stopper arm 20, a select arm 30, and a cam slider 40 as its main components. The transport roller is disposed in the vicinity of the inside of the front surface 1a of the chassis 1 constituting the outer shape of the optical disk reproducing device, and is inserted from the opening of the front surface 1a (a large-diameter disk D1 indicated by a two-dot chain line in the figure, a small-diameter disk). D2) is sent toward the rear surface 1b.

The disk stopper 10 is disposed closer to the rear surface 1b than the center of the loading position, and the protrusion 11 extending in the front-rear direction at the center engages with the guide groove 2 formed in the chassis 1 in the front-rear direction. It is supported so as to be movable in the front-rear direction. The disc stopper 10 is provided with a pair of abutting portions 12 and 12 on the left and right sides where the outer circumference in the feeding direction of the optical disc (upper side in the figure) abuts in the process of feeding the optical disc. Further, a convex shaft 13 that engages with a slot 21 of a stopper arm 20 to be described later in detail is provided at the center of the disk stopper 10.

The stopper arm 20 extends toward the left side surface 1c in a state where it partially overlaps the disk stopper 10, and is supported at a substantially central portion thereof so as to be rotatable around a support shaft 3 fixed to the chassis 1. . An elongated hole 21 into which the convex shaft 13 of the disk stopper 10 is engaged is formed at the inner end portion (right end portion in the figure) of the stopper arm 20. Further, a support shaft 22 for supporting a select arm 30, which will be described in detail later, is provided at an outer end portion (left end portion in the drawing) of the stopper arm 20. The stopper arm 20 here is urged by a torsion coil spring 50 in a direction in which the disk stopper 10 moves forward (a clockwise direction around the support shaft 3 in the figure).

The select arm 30 extends back and forth in the vicinity of the inside of the left side surface 1c, which is one of the left and right side surfaces 1c and 1d, and is formed by integrating two members 31 and 32 vertically. The rear end portion is supported so as to be rotatable about the support shaft 22 at the outer end portion of the stopper arm 20. At the front end of the upper member 31, which is one component of the select arm 30, is provided with a contact portion 33 with which the outer periphery of the side of the optical disc (the left side in the figure) abuts during the process of feeding the optical disc. . A convex shaft 34 that engages with a cam groove 41 of a cam slider 40, which will be described in detail later, is provided at the front end of the lower member 32 that is the other component of the select arm 30. Here, the select arm 30 is urged by a tension coil spring 51 toward the inward direction (counterclockwise direction around the support shaft 22 in the drawing).

The cam slider 40 is supported so as to be movable in the left-right direction in the vicinity of the inside of the front surface 1a, and a cam groove 41 is formed on the upper surface on the left end side to engage the convex shaft 34 of the select arm 30 (lower member 32). ing. A rack 45 is formed at the right end of the cam slider 40. The drive gear 52 is engaged with the rack 45 while the cam slider 40 moves from the vicinity of the right end which is one moving end to the vicinity of the left end which is the other moving end.
The cam slider 40 is moved by the rotational drive of the drive gear 52. However, when the cam slider 40 is located at the right end or the left end which is the moving end, the rack 45 and the drive gear 52 are arranged.
The engagement with the is disengaged.

Here, the cam groove 41 with which the convex shaft 34 of the select arm 30 engages includes a base groove 42 extending left and right. Further, the small-diameter disc that once shifts forward from the inner end (the right end in the drawing) of the base groove 42 and extends toward the right side and guides the convex shaft 34 of the select arm 30 when the small-diameter disc D2 is fed. Cam groove 43 is included. Further, the outer end of the base groove 42 (the left end in the figure)
Includes a large-diameter disk cam groove 44 that extends forward and rightward and guides the convex shaft 34 of the select arm 30 when the large-diameter disk D1 is fed. In the initial state before loading, the select arm 30 receives the restoring force directly from the tension coil spring 51 and indirectly receives the restoring force from the torsion coil spring 50 via the stopper arm 20. The convex shaft 34 is in a state of being restricted by the inner end of the base groove 42 in the cam groove 41 (see FIG. 1).

Next, the loading operation by the disk transport mechanism having such a configuration will be described in the order of the small diameter disk D2 and the large diameter disk D1.

As shown in FIG. 1, when the small-diameter disk D2 is inserted, the insertion is detected by an optical sensor (not shown), the transport roller is driven, and the small-diameter disk D2 is fed by the transport roller.

Then, as shown in FIG. 2, first, the outer circumference in the feeding direction (traveling direction) of the small diameter disk D2 contacts the contact portion 12 of the disk stopper 10, and the disk stopper 10 is pushed backward together with the small diameter disk D2. . Accordingly, the convex shaft 13 of the disk stopper 10
The stopper arm 20 engaged with the elongated hole 21 is rotated (rotated counterclockwise in the figure) while resisting the restoring force of the torsion coil spring 50 around the support shaft 3.
The select arm 30 supported by 0 and the support shaft 22 moves forward while resisting the restoring force of the tension coil spring 51. Accordingly, the convex shaft 34 of the select arm 30 is moved to the cam slider 4.
It moves forward along the small-diameter disk cam groove 43 while pressing the inclined surface as it is, coming off the inner end of the zero base groove 42 and coming into contact with the front inclined surface at the starting end of the small-diameter disk cam groove 43. First, the cam slider 40 receives the pressing force and moves to the left, and the rack 45 starts to engage with the drive gear 52 as shown in FIG.

Subsequently, the cam slider 40 receives a driving force from the driving gear 52 that meshes with the rack 45 and moves to the left as it is. When the cam slider 40 moves by a predetermined amount, the drive unit on which the turntable, the optical head, etc. are mounted starts to rise. The drive unit is driven by a separate cam mechanism with the cam slider 40. On the other hand, when the cam slider 40 is moving, the feeding of the small-diameter disk D2 by the conveying roller is continued and the disk stopper 10 is moved backward, and accordingly, the stopper arm 20 is centered on the support shaft 3. It is rotating. At the same time, the convex shaft 34 of the select arm 30 is guided toward its end while being restrained by the small-diameter disk cam groove 43 of the cam slider 40, and the select arm 30 rotates around the support shaft 22 with the stopper arm 20. It is moving.

Then, as shown in FIG. 4, almost as soon as the center of the small-diameter disk D2 reaches the center of the loading position, the drive unit ascends and the small-diameter disk D2 is clamped. However, the cam slider 40 continues to move to the left by receiving a driving force from the driving gear 52 thereafter. At this time, the convex shaft 34 of the select arm 30 is guided toward the end while being restrained by the small-diameter disk cam groove 43 of the cam slider 40, so that the select arm 30 and the stopper arm 20 continue to rotate. In response to this, the disk stopper 10 moves rearward, and the contact portion 12 of the disk stopper 10 moves away from the outer periphery of the small-diameter disk D2.

Thereafter, as shown in FIG. 5, the convex shaft 34 of the select arm 30 reaches the end of the small-diameter disk cam groove 43 of the cam slider 40, and the rack 45 of the cam slider 40 and the drive gear 52 are disengaged, so that the cam slider 40 stops. Immediately before that, the spring-like protruding piece 46 formed on the cam slider 40 gets over the pin 4 fixed to the chassis 1, and the locking of the protruding piece 46 by this pin 4 causes the cam slider 40 to move to the right. Movement is restricted. This completes the loading operation of the small-diameter disk D2.

Next, the loading operation of the large diameter disk D1 will be described. As shown in FIG. 1, when a large-diameter disk D1 is inserted, the insertion is detected by an optical sensor (not shown), the transport roller is driven, and the large-diameter disk D1 is fed by the transport roller.

Then, as shown in FIG. 6, first, the outer periphery on the side of the large-diameter disk D1 is the select arm 3.
The select arm 30 is brought into contact with the 0 contact portion 33 as it is, and the front end portion of the select arm 30 rotates outwardly while resisting the restoring force of the tension coil spring 51 around the support shaft 22 with the stopper arm 20 ( It rotates counterclockwise in the figure). Accordingly, the convex shaft 34 of the select arm 30 moves from its inner end to its outer end along the base groove 42 of the cam slider 40.

Subsequently, as shown in FIG. 7, the outer periphery in the feeding direction (traveling direction) of the large-diameter disk D1 contacts the contact portion 12 of the disk stopper 10, and the disk stopper 10 is pushed backward together with the large-diameter disk D1. It is. In response to this, the stopper arm 20 engaged with the convex shaft 13 of the disk stopper 10 by the elongated hole 21 rotates around the support shaft 3 while resisting the restoring force of the torsion coil spring 50 (counterclockwise in the figure). Thus, the select arm 30 supported by the stopper arm 20 and the support shaft 22 moves forward while resisting the restoring force of the tension coil spring 51. Accordingly, the convex shaft 34 of the select arm 30 is disengaged forward from the outer end of the base groove 42 of the cam slider 40 and comes into contact with the front inclined surface at the start end of the large-diameter disk cam groove 44 and presses the inclined surface as it is. While moving along the cam groove 44 for the large-diameter disk. First, the cam slider 40 receives the pressing force and moves to the left, and the rack 45 begins to engage with the drive gear 52 as shown in FIG.

Subsequently, the cam slider 40 receives a driving force from the driving gear 52 that meshes with the rack 45 and moves to the left as it is. When the cam slider 40 moves by a predetermined amount, the drive unit starts to rise. On the other hand, when the cam slider 40 is moving, the feeding of the large-diameter disk D1 by the conveying roller is continued and the disk stopper 10 is moved backward,
In response to this, the stopper arm 20 rotates about the support shaft 3. In conjunction with this,
The convex shaft 34 of the select arm 30 is guided toward the end thereof while being restrained by the cam groove 44 for the large-diameter disk of the cam slider 40, and the select arm 30 rotates about the support shaft 22 with the stopper arm 20. .

Then, as shown in FIG. 9, almost as soon as the center of the large-diameter disk D1 reaches the center of the loading position, the drive unit is lifted and the large-diameter disk D1 is clamped. However, the cam slider 40 continues to move to the left by receiving a driving force from the driving gear 52 thereafter. At this time, since the convex shaft 34 of the select arm 30 is guided toward the end thereof while being restrained by the large-diameter disk cam groove 44 of the cam slider 40, the select arm 30 and the stopper arm 20 continue to rotate. In response to this, the disk stopper 10 moves rearward, and the contact portion 12 of the disk stopper 10 moves away from the outer periphery of the large-diameter disk D1.

Thereafter, as shown in FIG. 10, the convex shaft 34 of the select arm 30 reaches the end of the cam groove 44 for the large-diameter disk of the cam slider 40, and the rack 45 of the cam slider 40 and the drive gear 52 are disengaged. The cam slider 40 stops. Immediately before that, the spring-like protruding piece 46 formed on the cam slider 40 gets over the pin 4 fixed to the chassis 1, and the locking of the protruding piece 46 by this pin 4 causes the cam slider 40 to move to the right. Movement is restricted. This completes the loading operation of the large-diameter disk D1.

In this way, the small-diameter disc D2 and the large-diameter disc D1 having different diameters can be guided to the prescribed loading positions and reproduced.

In such an optical disk reproducing apparatus, the disk stopper 10 does not move forward even if an unexpected impact is applied from the outside during the reproduction of the large-diameter disk D1, and as a result, the contact thereof. The part 12 does not come into contact with the outer periphery of the rotating large-diameter disk D1 during reproduction. The reason is as follows. The position of the disk stopper 10 during reproduction is regulated by the engagement between the convex shaft 34 of the select arm 30 supported via the stopper arm 20 and the terminal end of the large-diameter disk cam groove 44 of the cam slider 40. However, as long as the cam slider 40 does not move greatly, the convex shaft 34 of the select arm 30 will not be disengaged from the terminal end of the large-diameter disk cam groove 44 of the cam slider 40. Even if the cam slider 40 is moved by receiving an impact from the outside, the cam slider 40 is immediately engaged with the rack 40 and the drive gear 46, so that the movement is substantially limited. Then, the convex shaft 34 of the select arm 30 does not come off from the terminal end of the cam groove 44 for the large-diameter disk of the cam slider 40, and the position of the disk stopper 10 during reproduction is such that the contact portion 12 is the outer periphery of the large-diameter disk D1. It is placed away from the location.

During the reproduction of the small diameter disk D2, the position of the disk stopper 10 is regulated by the engagement between the convex shaft 34 of the select arm 30 and the end of the small diameter disk cam groove 43 of the cam slider 40. As in the case of the reproduction of No. 2, the movement of the cam slider 40 is substantially limited, and the convex shaft 34 does not come off the end of the small-diameter disk cam groove 43 even when an impact is applied from the outside. That is, the position of the disk stopper 10 during reproduction is also located at a position where the contact portion 12 is separated from the outer periphery of the small-diameter disk D2.

Therefore, even if an inadvertent impact is applied from the outside during reproduction, both the small-diameter disk D2 and the large-diameter disk D1 can be stably reproduced.

Incidentally, the ejection of the small-diameter disk D2 and the large-diameter disk D1 from the loading position, that is, the unloading operation, is performed by moving the cam slider 40 in the right direction by the reverse rotation of the drive gear 52 and the reverse rotation driving of the conveying roller. At that time, the cam slider 4
The movement of the cam slider 40 in the right direction until the zero rack 45 meshes with the drive gear 52 is
This is done by a separate cam mechanism that accompanies the movement of the optical head mounted on the drive unit to the inner peripheral end position.

In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the torsion coil spring 50 may be replaced with another elastic member such as a tension coil spring or a compression coil spring as long as the stopper arm 20 can be urged in the direction in which the disk stopper 10 moves forward. As for the tension coil spring 51, as long as the select arm 30 can be urged inward,
It may be replaced with another elastic member such as a torsion coil spring or a compression coil spring.

INDUSTRIAL APPLICABILITY The present invention is useful for a slot-in type optical disc playback apparatus that can handle both large-diameter and small-diameter optical discs.

It is a top view which shows the initial state in the optical disk reproducing | regenerating apparatus which is one Embodiment of this invention. It is a top view which shows one state during loading of the small diameter disc in the optical disc reproducing | regenerating apparatus which is one Embodiment of this invention. It is a top view which shows one state during loading of the small diameter disc in the optical disc reproducing | regenerating apparatus which is one Embodiment of this invention. It is a top view which shows one state during loading of the small diameter disc in the optical disc reproducing | regenerating apparatus which is one Embodiment of this invention. It is a top view which shows the loading completion state of the small diameter disc in the optical disc reproducing | regenerating apparatus which is one Embodiment of this invention. It is a top view which shows one state during loading of the large diameter disc in the optical disc reproducing | regenerating apparatus which is one Embodiment of this invention. It is a top view which shows one state during loading of the large diameter disc in the optical disc reproducing | regenerating apparatus which is one Embodiment of this invention. It is a top view which shows one state during loading of the large diameter disc in the optical disc reproducing | regenerating apparatus which is one Embodiment of this invention. It is a top view which shows one state during loading of the large diameter disc in the optical disc reproducing | regenerating apparatus which is one Embodiment of this invention. It is a top view which shows the loading completion state of the small diameter disc in the optical disc reproducing | regenerating apparatus which is one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chassis 2 Guide groove 3 Support shaft 4 Pin 10 Disc stopper 11 Projection 12 Contact part 13 Convex shaft 20 Stopper arm 21 Long hole 22 Support shaft 30 Select arm 31 Upper member 32 Lower member 33 Contact part 34 Convex shaft 40 Cam slider 41 Cam groove 42 Base groove 43 Cam groove for small diameter disk 44 Cam groove for large diameter disk 45 Rack 46 Projection piece 50 Torsion coil spring 51 Tension coil spring 52 Drive gear D1 Large diameter disk D2 Small diameter disk

Claims (4)

In an optical disk reproducing apparatus having a disk transport mechanism for guiding a small-diameter or large-diameter optical disk inserted from the front opening to a specified loading position,
The disk transport mechanism is
A conveying roller disposed near the inside of the front surface for feeding the optical disc;
A disc stopper that has a pair of abutting portions on the left and right sides that contact the outer circumference in the feeding direction of the optical disc in the process of feeding the optical disc, and is supported so as to be movable in the front-rear direction;
A stopper arm that is supported so as to be rotatable around a support shaft and has an elongated hole that engages with the convex shaft of the disk stopper at the inner end;
The support shaft at the rear end is extended in the vicinity of the inside of one side surface of both the left and right side surfaces, and has a contact portion with which the outer periphery of the side of the optical disk contacts in the process of feeding the optical disk. A select arm rotatably supported at the outer end of the stopper arm as a center;
A cam slider having a cam groove that is supported so as to be movable in the left-right direction in the vicinity of the inside of the front surface and that engages with the convex shaft of the front end portion of the select arm;
A drive gear for moving the cam slider in mesh with a rack of the cam slider from the vicinity of one moving end of the cam slider to the vicinity of the other moving end;
A torsion coil spring that biases the stopper arm in a direction such that the disk stopper moves forward;
A tension coil spring that biases the select arm inward,
The cam groove is
A base groove extending from side to side;
A cam groove for a small-diameter disk that extends from the inner end of the base groove and guides the convex shaft of the select arm when the small-diameter optical disk is fed;
An optical disk reproducing apparatus comprising: a large-diameter disk cam groove extending from an outer end of the base groove and guiding the convex shaft of the select arm when the large-diameter optical disk is fed. In an optical disk reproducing apparatus having a disk transport mechanism for guiding a small-diameter or large-diameter optical disk inserted from the front opening to a specified loading position,
The disk transport mechanism is
A conveying roller disposed near the inside of the front surface for feeding the optical disc;
A disc stopper that has a pair of abutting portions on the left and right sides that contact the outer circumference in the feeding direction of the optical disc in the process of feeding the optical disc, and is supported so as to be movable in the front-rear direction;
A stopper arm that is supported so as to be rotatable about a support shaft and has a slot that engages with the convex shaft of the disk stopper;
The support shaft at the rear end is extended in the vicinity of the inside of one side surface of both the left and right side surfaces, and has a contact portion with which the outer periphery of the side of the optical disk contacts in the process of feeding the optical disk. A select arm rotatably supported by the stopper arm as a center;
A cam slider having a cam groove that is supported so as to be movable in the left-right direction in the vicinity of the inside of the front surface and that engages with the convex shaft of the front end portion of the select arm;
A drive gear for moving the cam slider in mesh with a rack of the cam slider from the vicinity of one moving end of the cam slider to the vicinity of the other moving end;
A first elastic member that biases the stopper arm in a direction such that the disk stopper moves forward;
A second elastic member for urging the select arm inward,
The cam groove is
A base groove extending from side to side;
A cam groove for a small-diameter disk that extends from the inner end of the base groove and guides the convex shaft of the select arm when the small-diameter optical disk is fed;
An optical disk reproducing apparatus comprising: a large-diameter disk cam groove extending from an outer end of the base groove and guiding the convex shaft of the select arm when the large-diameter optical disk is fed. The optical disk reproducing apparatus according to claim 2, wherein the first elastic member is a torsion coil spring. 4. The optical disk reproducing apparatus according to claim 2, wherein the second elastic member is a tension coil spring.

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