JP4053258B2 - Disc clamp mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disc clamping mechanism that clamps a mini disc or the like on a turntable when information recorded from the mini disc or the like is reproduced or information is recorded on the mini disc or the like.
[0002]
[Prior art]
Conventionally, a mini-disc abbreviated as MD has been widely used as a small-sized and large-capacity recording medium in an in-vehicle audio device mounted on an automobile. In a minidisc, a disc-shaped recording medium is accommodated in a flat cartridge and the recording medium is not exposed, so that it is easy to handle and highly reliable. When reproducing information from a mini-disc or recording information, it is necessary to mount the recording medium on a turntable and rotate it at high speed. A clamp mechanism that mechanically holds the cartridge during reproduction or recording is provided. The applicant of the present application discloses a clamping mechanism of a mini-disc device in, for example, Japanese Patent Laid-Open Nos. 10-275394 and 11-66683.
[0003]
FIGS. 8 and 9 show, as FIGS. 27 and 28 in Japanese Patent Laid-Open No. 11-66683, a state in which the conventional mini-disc device 1 used for explanation of the prior art is simplified and seen in plan view and right side view, respectively. Show. The mini disk is clamped between the clamper 2 and the drive chassis 3. A drive shaft 4 that protrudes outward in the width direction is provided on one side of the drive chassis 3, and a drive force for clamping by the clamper 2 is generated. The generated driving force is transmitted to multiple sides via the interlocking member 5. This driving force is generated by the cam 8. Along with the driving force generated by the cam 8, a biasing force by the torsion coil spring 9 is applied to the clamper 2. This urging force acts as the clamp side 13 or the release side 14 in the direction of returning the deviation so that the center of the clamper 2 maintains the neutral position 12. The direction restricting portion 15 restricts the displacement of the clamp 2 with respect to the drive chassis 3 in the rotation axis direction of the turntable.
[0004]
FIG. 10 and FIG. 11 show the state of the combination of the clamper 2 and the drive chassis 3 when viewed from the right side and the bottom side, respectively. The position where the torsion coil spring 9 is locked to the drive chassis 3 is the position farthest from the bottom surface. For this reason, the clamp mechanism requires a space in the height direction.
[0005]
In JP-A-7-161107, the clamper is provided on the free end side of the clamper holder provided on the mini disc insertion direction side, the base end is joined to the chassis, and the base end side is pivotally displaced. A configuration of an optical disc player that performs a clamping operation is disclosed. A roller holder that indicates the loading roller is inserted between the clamper holder and the chassis so as to be able to swing and displace with the tip end as a fulcrum, and the coiler spring is pulled between the clamper holder and the roller holder. Accordingly, the clamper holder can press the cartridge of the mini disk against the loading roller. Japanese Patent Application Laid-Open No. 11-234962 discloses that a tension coil spring is stretched in a plurality of directions, and even if the rotor of the spherical actuator rotates, the camera inserted into the through hole in the rotor does not rotate but has a constant angle. Techniques for keeping it are disclosed.
[0006]
[Problems to be solved by the invention]
As shown in FIGS. 10 and 11, when the torsion coil spring 9 is used for urging the clamper 2 to clamp the minidisk, the drive chassis 3 has a height H 1 due to the locking point of the torsion coil spring 9. It becomes necessary and it becomes difficult to fit the clamp mechanism in a small space. Similar to the coil spring stretched between the clamper holder and the roller holder in Japanese Patent Laid-Open No. 7-161107, if the clamp spring is pulled between the clamper 2 and the drive chassis 3, the coil spring is engaged. The stopping position can be brought closer to the bottom side of the drive chassis 3, and it is expected that the clamp mechanism will be miniaturized.
[0007]
However, when the clamper 2 is pulled in accordance with the displacement direction regulated by the direction regulating unit 15 with a coil spring, it has been found that a so-called chatter phenomenon occurs when the direction regulating unit 15 regulates the displacement direction. . The chatter phenomenon occurs when the direction restricting portion 15 restricts the displacement direction, and the direction of pulling by the coil spring is slightly deviated from the direction allowing the displacement, and the guide is received while being caught little by little.
[0008]
An object of the present invention is to provide a disc clamping mechanism that can be miniaturized and that can smoothly move a clamper.
[0009]
[Means for Solving the Problems]
According to the present invention, a clamper mounted with a disk-shaped recording medium housed in a cartridge is moved with respect to a chassis having a turntable by the elastic force of an elastic member in the direction of the rotation axis of the turntable. In the disc clamp mechanism that performs clamping,
Direction regulating means for regulating the displacement direction of the clamper so that the opposing surfaces of the disk and the cartridge are parallel;
And a resilient member looped inclined respectively between the clamper and the chassis disc sides,
The elastic member is a disc clamping mechanism characterized in that one side of both sides of the disc is biased in a direction crossing a bias direction on the other side .
[0010]
According to the present invention, the disc-shaped recording medium accommodated in the cartridge is rotationally driven by the turntable, and the recorded information is reproduced and the information is recorded. The disk clamp mechanism sandwiches the cartridge with a clamper with respect to a chassis including a turntable. The direction of displacement of the clamper is regulated by the direction regulating means so that the opposing surfaces of the disk and the cartridge are parallel and are displaced in the direction of the rotation axis of the turntable. The clamper is pulled by the elastic force of the elastic member slanted on both sides of the disk and moves so as to clamp the disk. Since the elastic member is slanted, the displacement direction of the clamper is always regulated by the direction regulating means. Even if it tries to pull in the direction guided by the direction restricting means on both sides of the disk, it cannot be completely matched, and the displacement direction is repeatedly shifted within the regulated width. For this reason, the displacement is not performed smoothly, and a phenomenon called chattering is likely to occur, and a phenomenon called skipping is likely to occur during reproduction. By biasing the direction of the elastic force of the elastic member, the guide of the displacement by the direction regulating means is performed biased to the bias direction, since the guide condition is stable, also displaced Ru performed stably. In the present invention, the direction in which the elastic force of the elastic member is biased intersects on one side and the other side on both sides of the disk. Accordingly, a bias in the front-rear direction can be applied to the disc insertion direction, so that chattering can be suppressed and sound skipping can be prevented.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 and FIG. 2 show a state where the disc clamp mechanism 20 according to one embodiment of the present invention is viewed from the right side and the bottom. 1 and 2, the mini disc is inserted in the direction from the left side on the front side to the right side on the back side and clamped against the turntable. When the clamp is released, the mini disc is ejected in the direction from right to left. Is done. The gap between the clamper 22 and the drive chassis 23 is widened when the mini-disc is inserted and ejected, and the gap is narrowed when clamping, so that the clamper 22 moves the mini-disc cartridge to the drive chassis 23. Clamp it in between.
[0014]
The plane portion where the clamper 22 contacts the cartridge during clamping is perpendicular to the rotation axis of the turntable and is kept parallel to the bottom surface of the drive chassis 23 so that the distance between the clamper 22 and the drive chassis 23 is The clamper 22 is displaced relative to the drive chassis 23 so as to change. The mechanism disclosed in Japanese Patent Application Laid-Open Nos. 10-275394 and 11-66683 can be used for driving for displacement.
[0015]
The portions on both sides in the width direction of the clamper 22 are bent vertically, and the tip faces the drive chassis 23 side. In order to regulate the displacement direction of the clamper 22, a plurality of horizontal shafts 24 protrude from the bent side surface outward in the width direction at intervals. Even on the drive chassis 23 side, both sides in the width direction are bent perpendicularly to the bottom surface portion, and a direction restricting portion 25 directed toward the clamper 22 side is provided corresponding to the position of each horizontal shaft 24. The direction restricting portion 25 is formed with a groove to which the horizontal shaft 24 is fitted and guided.
[0016]
A plurality of indicator shafts 26 protrude from both sides of the drive chassis 23 in the width direction at intervals, and a plurality of shock absorbers 27 are arranged at both ends of the minidisk insertion direction and the ejection direction. The indicator shaft 26 and the shock absorber 27 are used for the drive chassis 23 to be supported by the base chassis of the minidisc device.
[0017]
The clamper 22 and the drive chassis 23 of the present embodiment are pulled by a coil spring 29 whose one end is locked to a locking portion 28 near the bottom surface of the drive chassis 23. The other end of the coil spring 29 is locked to a locking portion 30 provided on the clamper 22. In the present embodiment, since the spring bias relating to the torsion torque is not performed by the torsion coil spring 9 as shown in FIGS. 10 and 11, the coil spring 29 is simply pulled, so that the cost required for the spring can be reduced. it can. Further, since the locking portion 28 on the drive chassis 23 side is provided near the bottom surface, the height H2 required for the drive chassis 23 can be made lower than the height H1 of the drive chassis 3 shown in FIGS. That is, since H2 <H1, the space required for the disk clamp mechanism 20 can be reduced, and the minidisk device can be miniaturized.
[0018]
FIG. 3 shows the arrangement direction of the coil spring 29 in the present embodiment in a simplified manner as viewed from the right side. FIG. 3A shows the clamper 22 on the right side shown in FIG. This right side surface is displayed at the top in FIG. FIG. 3B shows the arrangement direction of the coil spring 29 on the left side displayed on the lower side of FIG. The coil spring 29 applies a tensile force to the clamper so that the clamper 22 is biased by being inclined in the front-rear direction of the minidisk insertion direction with respect to the direction in which the clamper 22 is displaced relative to the drive chassis 23.
[0019]
That is, the coil spring 29 is biased in one of the mini-disc insertion direction and the ejection direction on one side in the width direction and biased in the other in the mini-disc insertion direction or ejection direction on the other side in the width direction. become. Since the direction in which the coil spring 29 is biased is different between the insertion direction and the ejection direction of the mini-disc on one side and the other side in the width direction, chatter can be suppressed and sound skipping can be prevented.
[0020]
FIG. 4 shows a simplified arrangement state of the coil spring 29 in a plan view. Since it is in a plan view state, the side surface on the side of FIG. 3 (a) is the lower side, and the side surface on the side of FIG. 3 (b) is the upper side. In the present embodiment, as shown in FIG. 4A, the coil spring 29 is biased outward in the width direction on both sides in the width direction with respect to the drive chassis 23, and is pulled in the opposite direction. For this reason, the drive chassis 23 is rotated 29a by couple. As shown in FIG. 4B, the coil springs 29 on both sides can be pulled into a “C” shape.
[0021]
Thus, since the bias of the coil spring 29 includes a component in the width direction, the bias direction of the tensile force is aligned on both sides in the width direction as viewed from the insertion direction of the mini-disc, or in a “C” shape. By applying a tensile force, chattering can be suppressed and sound skipping can be prevented.
[0022]
FIG. 5 shows the shape of the drive chassis 23 used in this embodiment. The drive chassis 23 is provided with a turntable 31 for rotationally driving a disc-shaped recording medium in the mini-disc and a pickup 32 for reproducing and recording information on the disc-shaped recording medium on the bottom surface. The bottom surface of the drive chassis 23 is perpendicular to the rotation axis of the turntable 31, and a mini-disc is inserted and ejected along a straight line in the surface. Within this plane, the width direction is defined along a straight line perpendicular to the straight line, and the direction restricting portion 25 and the support shaft 26 are provided on both sides of the width direction.
[0023]
FIG. 6 shows the shape of the clamper 22 used in this embodiment. The clamper 22 is generally plate-shaped and clamps in contact with a mini-disc cartridge. The horizontal shaft 24 protrudes on both sides in the width direction, and is fitted into a groove of the direction restricting portion 25 of the drive chassis 23 to be restricted in the displacement direction. In the guide in the displacement direction by the fitting between the horizontal shaft 24 and the groove, there is a slight gap between the horizontal shaft 24 and the groove, and if the coil spring 29 is pulled only in the direction in which the groove is formed, Smooth displacement is difficult due to the accumulation of slight errors. When a bias is applied to the tensile force, the guide conditions are stabilized and smooth displacement is possible.
[0024]
FIG. 7 shows the shape of the base chassis 40 used in this embodiment. The base chassis 40 is provided with a motor 41 serving as a drive source that drives the clamper 22 to move relative to the drive chassis 23, a transmission mechanism 42 that transmits a driving force from the motor 41, and the like. The deck portion of the mini disc device including the clamper 22 and the drive chassis 23 is mounted on the MD deck mounting portion 43.
[0025]
1 to 7, in the disc clamp mechanism 20 of the present embodiment, a disc-shaped recording medium housed in a mini disc cartridge is rotated by a turntable 31 to record recorded information. Playback and information recording are performed. The mini disc is inserted and ejected in a direction perpendicular to the rotation axis of the turntable 31. In order to stably rotate and drive the disk-shaped recording medium by the turntable 31, the disk clamp mechanism 20 sandwiches the cartridge with the plate-shaped clamper 22 with respect to the drive chassis 23 including the turntable 31. The clamper 22 has a horizontal shaft 24 of the clamper 22 and a direction restricting portion 25 of the drive chassis 23 so that the contact surface to the cartridge is displaced in the rotation axis direction in a posture perpendicular to the rotation axis of the turntable 31. The displacement direction is regulated by the including direction regulating means.
[0026]
The clamper 22 and the drive chassis 23 are pulled by the coil spring 29 on both sides in the width direction perpendicular to the direction in which the mini disk is inserted and ejected with respect to a virtual plane perpendicular to the rotation axis of the turntable 31. Since the direction in which the coil spring 29 is pulled is biased so as to incline from the rotational axis direction, the direction of displacement is always regulated by the direction regulating means. Even if it tries to pull in the direction guided by the displacement restricting means on both sides in the width direction, it cannot be completely matched, and the displacement direction is repeatedly shifted within the restricted width, and the displacement is not smoothly performed. A phenomenon called chattering is likely to occur, and a phenomenon called skipping is also likely to occur during reproduction. By applying a bias in the direction of pulling by the coil spring 29, the guide of the displacement by the direction restricting means is biased in the bias direction and the guide condition is stabilized, so that the regulated displacement is also stably performed, and chattering and the like occur. Can be suppressed and the occurrence of sound skipping can be prevented.
[0027]
The coil spring 29 can be similarly used as long as it is an elastic member having an elastic force, such as another type of spring or rubber. Similarly to the mini disk, the present invention can be applied to other disks such as a magneto-optical disk (MO) in which a disk-shaped recording medium is accommodated in a cartridge.
[0028]
【The invention's effect】
As described above, according to the present invention, the disk clamp mechanism includes a plate-shaped clamper and a turntable for stably rotating and driving a disk-shaped recording medium housed in a cartridge such as a mini disk. Insert it into the chassis. The displacement direction of the clamper is regulated so that the opposing surfaces of the disk and the cartridge are parallel, and the clamper moves in the direction of the rotation axis of the turntable to clamp the disk. Between the clamper and the chassis, the elastic force of the elastic member is biased so as to incline from the rotation axis direction of the turntable, so that the displacement guide by the direction regulating means is biased in the bias direction, The regulation conditions are stable, and the clamper moves stably. Further, according to the present invention, the direction in which the elastic member is crossed is crossed between the one side and the other side on both sides of the disc, and a bias in the front-rear direction is given to the elastic force in the disc insertion direction. As a result, the occurrence of chattering can be suppressed and the occurrence of sound skipping can be prevented.
[Brief description of the drawings]
FIG. 1 is a right side view of a disc clamp mechanism 20 according to an embodiment of the present invention.
2 is a bottom view of the disc clamp mechanism 20 of FIG. 1. FIG.
3 is a right side view showing a simplified arrangement of a coil spring 29 in the disk clamp mechanism 20 of FIG. 1. FIG.
4 is a plan view showing a simplified arrangement of coil springs 29 in the disk clamp mechanism 20 of FIG. 1. FIG.
5 is a perspective view of a drive chassis 23 used in the disk clamp mechanism 20 of FIG.
6 is a perspective view of a clamper 22 used in the disk clamp mechanism 20 of FIG. 1. FIG.
7 is a perspective view of a base chassis 40 to which the disc clamp mechanism 20 of FIG. 1 is attached. FIG.
FIG. 8 is a simplified plan view of a conventional disk clamp mechanism.
9 is a right side view of the disk clamp mechanism of FIG. 8. FIG.
FIG. 10 is a right side view of a clamp mechanism using a conventional torsion coil spring.
11 is a bottom view of the disc clamp mechanism of FIG.
[Explanation of symbols]
20 Disc clamp mechanism 22 Clamper 23 Drive chassis 24 Horizontal axis 25 Direction restricting portions 28, 30 Locking portion 29 Coil spring 31 Turntable 40 Base chassis

Claims (1)

A disc that clamps a disc by moving a clamper mounted with a disc-shaped recording medium housed in a cartridge with respect to a chassis having a turntable by the elastic force of an elastic member in the rotation axis direction of the turntable. In the clamping mechanism,
Direction regulating means for regulating the displacement direction of the clamper so that the opposing surfaces of the disk and the cartridge are parallel;
And a resilient member looped inclined respectively between the clamper and the chassis disc sides,
The disk clamping mechanism according to claim 1, wherein the elastic member is biased in a direction crossing a bias direction on the other side on one side of the both sides of the disk.

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