JP2000067495A - On-vehicle disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamper holding structure for on-vehicle disk player, capable of suppressing fluctuation in a press-contact force caused by temperature change and optionally setting a press-contact force. SOLUTION: A clamp arm 6 is rotatably supported on a drive unit 1 having a turntable 4 loaded, and a clamper 7 is rotatably supported by the clamp arm 6. The clamp arm 6 is pressed in such a direction that it always approaches the drive unit 1, and the clamper 7 is brought into pressing-contact with a disk D loaded on the turntable during playing. During the ejection of the disk D, however, the clamper 7 is separated from the drive unit 1, and placed on standby upward. A disk guide is attached to the backside of a top chassis 8 hung on the upper end of a chassis 3, both ends of a coil spring 12 are locked in a pair of projected parts formed in a disk guide plate and, during the ejection of the disk D, a center part along the pulling direction of the coil spring 12 is elastically brought into contact with the upper surface of the clamper 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk player such as an in-vehicle CD player and a CD-ROM player, and more particularly to a clamper for stably holding a clamper at a position separated from a turntable when a disc is ejected. Regarding the structure.

[0002]

2. Description of the Related Art In general, in a car CD player, a clamp arm is rotatably supported by a drive unit on which a pickup, a turntable, and the like are mounted, and a clamper rotatably supported by the clamp arm during play and the turntable. It is configured to hold the disk with. Although the clamp arm is constantly biased in a direction to approach the drive unit, when the disc is not loaded in the disc player, the clamp arm waits above the drive unit and holds the clamper at a position separated from the turntable. Has become. In this ejected state, the upper surface of the clamper comes into contact with the elastic member, thereby preventing generation of abnormal noise called rattle noise due to external vibration.

Conventionally, as such a clamper holding structure, a urethane foam having a high cushioning property is attached to a top chassis provided on the upper surface of the chassis, or a disk guide made of synthetic resin attached to the back surface of the top chassis. A spring piece is integrally formed, and the urethane foam and the spring piece are pressed against the upper surface of the clamper at a position separated from the turntable so that the clamper is fixedly held at the time of ejection.

[0004]

However, in the conventional clamper holding structure described above, it is difficult to adjust the pressure contact force of a spring piece made of urethane foam or synthetic resin used as an elastic member, and the amount of wear is large. When the environmental temperature repeatedly changes between high and low temperatures, there is a problem that the elastic member pressed against the clamper is deformed (cold flow) and a desired pressing force cannot be obtained. . Therefore, it is conceivable to use an elastic metal plate such as phosphor bronze, but in this case, it is necessary to press the elastic metal plate into a predetermined shape or to screw the elastic metal plate to a top chassis or the like. This raises a new problem that costs increase.

[0005]

According to the present invention, both ends of a coil spring are hooked on appropriate members such as a top chassis and a disk guide integrated with a chassis, and a force in a direction perpendicular to a pulling direction of the coil spring is applied. , The clamper is fixedly held at the separated position of the turntable. By using such a coil spring, it is possible to almost eliminate the fluctuation of the pressing force due to the temperature change, and it is possible to arbitrarily set the pressing force by selecting a general-purpose coil spring. The installation of the coil spring is simple, and the cost increase can be suppressed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a disk player for a vehicle according to the present invention, a turntable that rotates by using a motor as a drive source, a drive unit that mounts the turntable, a chassis that supports the drive unit, and a clamper that is rotatably supported. A clamp arm that holds the clamper at a position separated from the turntable when ejecting the disc, and presses the clamper against the turntable via the disc during play in a vehicle-mounted disc player. Both ends of the coil spring were hung on the chassis or a member integrated with the chassis, and a center portion of the coil spring along a pulling direction was elastically contacted with an upper surface of the clamper held at a position separated from the turntable. .

With this configuration, the clamper can be stably held at the separated position of the turntable by pressing the upper surface of the clamper in a direction perpendicular to the direction in which the coil spring is pulled, resulting in a temperature change. Fluctuations in the pressing force can be almost eliminated. Further, by selecting a general-purpose coil spring, the pressure contact force can be arbitrarily set, and the coil spring can be easily attached and cost increase can be suppressed.

When an elastic body is attached to the coil spring, the coil spring resiliently contacts the upper surface of the clamper via the elastic body, so that rattle noise can be effectively reduced.

[0009]

Embodiments will be described with reference to the drawings.
FIG. 1 is a plan view of an on-vehicle disk player according to an embodiment,
FIG. 2 is a rear view of a top chassis provided in the disk player as viewed from the back side, and FIG. 3 is an operation explanatory view of a clamper holding structure provided in the disk player.

In FIG. 1, reference numeral 1 denotes a drive unit. The drive unit 1 is movably supported by a chassis 3 via elastic members including a plurality of coil springs 2 and air dampers (not shown). As shown in FIG. 3, the drive unit 1 includes a turntable 4 for rotating the disk D and a spindle motor 5 as a drive source thereof, and an optical pickup (not shown) for reading information signals from the disk D. And so on. The drive unit 1 is selectively switched between a locked state and an unlocked state by a lock mechanism (not shown). When the disc D is ejected, the drive unit 1 is in a locked state fixedly supported on the chassis 3 and when the disc D is played. Is a chassis 3 via an elastic member such as a coil spring 2.
To an unlocked state supported movably.

The clamp arm 6 is mounted on the drive unit 1.
The clamp arm 6 is rotatably supported at the rear end of the drive unit 1. The clamp arm 6 is urged by a coil spring (not shown) in a direction to always approach the drive unit 1.
When ejected, the drive unit 1 is regulated to separate from the drive unit 1 and wait upward. A clamper 7 is rotatably supported at the tip of the clamp arm 6, and the clamper 7 faces the turntable 4. The rotation shaft of the clamper 7 is supported by the clamp arm 6 with a slight play (play), and the play enhances the centering function with respect to the turntable 4.

A top chassis 8 is provided on the upper end of the chassis 3 on the side of the disk D insertion opening, and the top chassis 8 is integrated with the chassis 3 by screwing or the like. As shown in FIG. 2, a disk guide plate 9 made of a highly slippery resin is attached to the back surface of the top chassis 8, and a pair of disk detection levers 10 are provided between the top chassis 8 and the disk guide plate 9. And a link slider 11 for connecting them.
A drive roller (not shown) is provided below the disk guide plate 9, and the disk D is mounted on the disk guide plate 9.
It is conveyed in a state of being sandwiched between the driving roller and the driving roller. At the rear end of the disc guide plate 9, a pair of arms 9b having projections 9a is formed, and both ends of the coil spring 12 are hooked on these projections 9a. The coil spring 12 extends so as to cross a notch 8 a formed at the center of the rear end of the top chassis 8, and the center of the coil spring 12 along the pulling direction is the clamper 7.
Is opposed to the upper surface.

Next, the operation of clamping the disk D among the operations of the vehicle-mounted disk player configured as described above will be mainly described with reference to FIG. First, when the disc D is not loaded in the disc player, as shown in FIG. 3A, the clamp arm 6 is held in a standby state separated from the drive unit 1 and the upper surface of the clamper 7 is It is in elastic contact with the central portion of the coil spring 12 along the pulling direction. Therefore,
The clamper 7 is pressed by a pressing force in a direction perpendicular to the tension direction of the coil spring 12 and is fixedly held at an upper position away from the turntable 4, so that rattle noise due to external vibration is prevented. You. At the time of the ejection, the drive unit 1 is in a locked state fixedly supported by the chassis 3.

When the disc D is loaded into the disc player from the insertion slot, the outer peripheral edge of the disc D comes into contact with a detection pin 10a hanging from the tip of the disc detection lever 10, and the disc detection lever 10 rotates. The rotation of the detection pin 10a activates a detection switch (not shown), which starts a drive motor (not shown) to rotate the above-described drive roller in one direction. It is conveyed to the inside of the disc player while being held between the plate 9. During this time, the clamp arm 6 and the clamper 7 are held at the standby position above the drive unit 1 and the drive unit 1 is kept in the locked state, so that the disk D is prevented from colliding with the drive unit 1.

When the center of the disk D is transported to a position directly above the turntable 4, the drive unit 1 is unlocked and unlocked, and is elastically supported by the chassis 3 via the coil spring 2 and the like. You. Further, the standby state of the clamp arm 6 is released in conjunction with this operation, and the clamp arm 6 rotates downward with the rear end of the drive unit 1 as a fulcrum, and as shown in FIG. 4 is pressed against disc D on top. In this play state, the clamper 7 separates from the coil spring 12 and becomes free. When the spindle motor 5 is driven to rotate, the turntable 4, the disk D and the clamper 7 rotate integrally, and the optical pickup picks up the disk. The reproduction operation of D is performed.

When the disc D is ejected from the disc player to the outside, the reverse operation is performed, and the clamp arm 6 is moved from the clamped state shown in FIG.
The state returns to the standby state shown in FIG. 7A, and in this standby state, the upper surface of the clamper 7 elastically contacts the coil spring 12 again.

In the embodiment configured as described above,
Since the central portion of the coil spring 12 stretched between the protrusions 9a of the disc guide plate 9 elastically contacts the upper surface of the clamper 7, the clamper 7 can be stably held at the separated position of the turntable 4, Lattle noise caused by external vibration can be reliably prevented.
Further, since the clamper 7 is pressed against the coil spring 12 by using a force in a direction perpendicular to the pulling direction of the coil spring 12, a change in the pressing force due to a temperature change can be almost eliminated. By changing the length, the pressing force against the clamper 7 can be arbitrarily set. Furthermore, since the coil spring 12 is a general-purpose product and is easily attached, cost increase can be suppressed.

In the above embodiment, the case where the coil spring is brought into direct contact with the upper surface of the clamper has been described. However, an elastic body such as a rubber tube is attached to the coil spring, and this elastic body is elastically attached to the upper surface of the clamper. You may make it contact. In this case, the elastic body comes into contact with the clamper, and the metal coil spring does not directly contact the clamper, so that rattle noise can be effectively reduced.

In the above embodiment, the case where both ends of the coil spring 12 are hooked on the projection 9a of the disc guide plate 9 has been described. However, the present invention is not limited to this, and another member having a fixed relationship with the chassis 3, for example, the top chassis 8 is also possible.

[0020]

The present invention is embodied in the form described above and has the following effects.

Both ends of the coil spring are hooked on appropriate members such as a top chassis and a disc guide integrated with the chassis, and the clamper is mounted on the turntable by using a force in a direction perpendicular to the pulling direction of the coil spring. If it is configured to be fixedly held at the separated position, fluctuations in the pressure contact force due to temperature changes can be almost eliminated, and the pressure contact force can be set arbitrarily by selecting a general-purpose coil spring. In addition, the installation of the coil spring is simple, and the increase in cost can be suppressed.

When an elastic body such as a rubber tube is attached to the coil spring, the coil spring elastically contacts the upper surface of the clamper via the elastic body, so that rattle noise can be effectively reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a vehicle-mounted disc player according to an embodiment.

FIG. 2 is a rear view of the top chassis provided in the disc player as viewed from the back side.

FIG. 3 is an operation explanatory view of a clamper holding structure provided in the disc player.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive unit 3 Chassis 4 Turntable 5 Spindle motor 6 Clamp arm 7 Clamper 8 Top chassis 8a Notch 9 Disc guide plate 9a Projection 9b Arm 12 Coil spring D disk

Claims (2)

[Claims] 1. A turntable that rotates with a motor as a drive source, a drive unit on which the turntable is mounted, a chassis supporting the drive unit,
A clamp arm rotatably supporting the clamper, the clamp arm holding the clamper at a position separated from the turntable when ejecting the disc, and pressing the clamper against the turntable via the disc during play. In the vehicle-mounted disc player, both ends of a coil spring are hung on the chassis or a member integrated with the chassis, and a center portion of the coil spring along a pulling direction of the coil spring is held at a position separated from the turntable. An in-vehicle disc player characterized by being in elastic contact with the upper surface. 2. The locking mechanism according to claim 1, wherein an elastic body is attached to the coil spring.