JPH0755749Y2 - Opening / closing device for disc-shaped recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a lid opening / closing device for chucking a disk-shaped recording medium such as an optical disc such as a compact disc to a rotating mechanism.

[Outline of device]

According to the present invention, an intermediate portion of a spring member for urging a lid for urging a disk-shaped recording medium such as a compact disc to a rotating mechanism is biased in an opening direction, and abutted in a flexible manner on the housing side with the lid closed. As a result, a two-stage biasing force is applied to the lid, that is, the biasing force for releasing the chucking of the disk-shaped recording medium and the biasing force for greatly opening the lid. This is a good and smooth process.

[Conventional technology]

In a conventional compact disc player (CD player), as an opening / closing mechanism of a CD lid provided with a chucking member for chucking a compact disc on a turntable rotated by a spindle motor, as shown in FIG. The torsion coil spring (24) is inserted into the pivotally supporting part (23) of the CD lid (22) with respect to (21), and its tip (24a) is abutted against the inner surface side of the CD lid (22), and the rear end (24b).
The CD cover is opened by abutting against the player casing (21) side and the screw force generated in the coil portion (24c) of the torsion coil spring (24).

A chucking member (25) provided on the CD lid (22)
This magnet (26) has a built-in magnet (26)
An attraction force acts between the turntable (27) and the turntable (27), and the attraction force causes the compact disc to be chucked to the turntable (27). In the figure, (28) is a spindle motor.

[Problems to be solved by the device]

As described above, the load of the CD lid that is opened by being biased by the twisting force of the torsion coil spring is the sum of the weight of the lid and the attraction force to the turntable by the magnet of the chucking member when the CD lid is slightly opened. When the CD lid is opened and the chucking member is separated from the turntable, only the weight of the lid is applied. Therefore, the opening operation by unlocking this CD lid opens slowly because the load is heavy in the initial stage, that is, until the chucking is released, and the load is released in the next stage, that is, when the chucking is released. Since it is sharply reduced, it will be elastically vigorously released to the end all at once.

Therefore, the CD lid is stopped in a collision state at the open end, not only the feeling of opening operation is deteriorated, but also the lid is deformed by the impact at the time of opening and the lid pivotal part is damaged. In addition, the impact of opening the CD lid may hinder other members of the CD player, especially the optical system.

The present invention has been made in view of the above problems of the prior art. The purpose of the present invention is to reduce the impact of the opening operation of the lid to provide a good feeling and smooth opening / closing operation. An object of the present invention is to provide a lid opening / closing device for a disk-shaped recording medium.

[Means for Solving the Problems]

In order to achieve the above object, in the lid opening / closing device according to the present invention, a lid having a chucking member for chucking a disk-shaped recording medium on a rotating mechanism by an attractive force is pivotally supported so as to be capable of undulating with respect to a housing. A spring member for urging the lid in the opening direction is interposed between the lid and the housing, and the tip of the spring member is engaged with the lid to urge the lid in the opening direction and the intermediate portion is When the lid is closed, it is abutted flexibly on the housing side. When the lid is opened, the restoring force of the flexible portion of the spring member acts, and thereafter the spring member continues from this restoring force. The lid is opened by its own urging force.

[Action]

In the lid opening / closing device of the present invention configured as described above, when the lid is closed, the middle portion is flexibly abutted to the case side with the tip of the spring member engaged with the lid, so that the lid is closed. When the lock is released, the flexible part of the spring member restores and the lid is pushed up against the attraction force of the chucking member against the rotating mechanism side, and when the chucking member is separated from the rotating mechanism side, the lid has the flexible shape of the spring member. The restoring force of the portion continuously shifts to the biasing force of the spring member itself, and the spring member is biased and released in the opening direction.

In this way, the spring member applies an opening biasing force to the lid by shifting the restoring force of the flexure portion of the spring member to the biasing force of the spring member itself. By setting the biasing force for opening the lid of the spring member itself to be smaller than the restoring biasing force of the portion, the opening / closing operation of the lid can be performed with a good feeling and smoothly.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

In the figure, (1) shows a case of a compact disc player (CD player), and (2) shows a spindle motor provided on the side of the case (1). A turntable (3) made of metal is attached.

(4) is a lid pivotally supported on the upper side surface of the box (1) by a shaft (5) so that the lid (4) is chucked in the center of the inner surface of the lid (4) in correspondence with the turntable (3). Material (6)
Is installed. The chucking member (6) is constituted by a chucking plate (7) having substantially the same diameter as the turntable (3) and a chucking magnet (8) fixed to the upper surface of the plate (7). The member (6) has an attachment portion (9) in which an engaging portion (7a) formed by a tubular portion and an engaging disk is provided at the center of the upper surface of the chucking plate (7) and is provided substantially at the center of the inner surface of the lid (4). ) Is slidable in the up and down direction and is rotatably mounted in the circumferential direction.

And in this example, the torsion coil spring (10) is interposed between the box (1) and the lid (4) so that the lid (4) is always
It is biased in the opening direction. This Torsion Coil Spring (10)
The coil portion (10a) is fitted into the pivotal support portion of the lid (4), the rear end portion (10b) is engaged with the corner portion on the upper surface (1a) side of the box (1), and the front end portion (10c). ) Is extended and bent into a V-shape, and its tip end is a locking portion (11) protrudingly provided on the inner surface of the lid (4).
Is engaged with.

In this torsion coil spring (10), with the lid (4) closed, the bent top (10c ₁ ) of the front end (10c) abuts against the upper surface (1a) of the box (1), so that the front end (10c) Bent top (1
0c ₁ ) will be bent.

Further, the lid (4) is provided with a lock mechanism (12) for locking the lid (4) in a closed state at an edge facing the pivotal support, that is, a free end, and the lock mechanism (12) is a push-push type lid (4). When 4) is pressed, it is locked, and when it is pressed again, the lock is released.

In the figure, D is a compact disc.

To load the compact disc D into the CD player having the above-mentioned structure, the lid (4) is opened, the lid is placed on the turntable (3), and the lid (4) is closed again. The chucking plate (7) is superposed on the center of the disc D so as to face the turntable (3), whereby the chucking magnet (8) is attracted to the turntable (4) via the disc D. Then, the compact disc D is chucked on the turntable (3), and the spindle motor (2)
The recording signal is reproduced by being rotated by the drive of.

In this state, in the torsion coil spring (10), the bent top (10c ₁ ) of the tip (10c) contacts the upper surface (1a) of the box (1), and the tip of the torsion coil spring (10) engages with the locking portion of the lid (4) ( It is elastically bent by being pressed while being locked by 11), and is held by the lock of the lid (4) in this state.

When the lid (4) is unlocked after the reproduction of the disc D is completed in this way, the front end portion (10) of the torsion coil spring (10) is
The c) is restored from the deflected state and biases the lid (4) in the opening direction, so that the chucking member (6) has the chucking magnet (8) turned on the turntable (3).
When the chucking magnet (8) is released from the attraction, the lid (4) is further urged in the opening direction by the elasticity of the coil portion (10a) of the torsion coil spring (10). That is, in the latter stage of opening the lid (4), the torsion coil spring (10) acts as a simple torsion spring (torsion spring) and is urged to open.

As described above, the torsion coil spring (10) in the present example exerts the bias for releasing the chucking member (6) against the lid (4) and the bias for opening the lid (4) itself. It will act in two steps. Therefore, the torsion coil spring (10) increases the biasing force for releasing the chucking and reduces the biasing force for opening the lid, so that the lid (4) can be opened and closed with a good feeling and smoothly.

This torsion coil spring (10) can be likened to a beam with one end fixed, one end fulcrum and a centralized concentrated load when the lid (4) is closed, as shown in FIG. 3A. The relationship of the amount of deflection can be simply calculated as follows.

Here, W is a spring force, and the wire diameter d, the lengths a, b, and l are set so that W ≧ (the weight of the lid (4)) + (the attraction force of the chucking magnet (7)). The longitudinal elastic modulus E, the section modulus I, and the deflection amount y are calculated.

Also, the lid (4) is opened and the chucking magnet (7) is opened.
In the state in which the suction of is released, the torsion coil spring (10) is considered to be a simple torsion spring (torsion spring) as shown in FIG. 3B.

Therefore, if the length of the torsion coil spring is L and the number of turns of the coil portion is N, From the twist angle φ ₁ and k, the opening force of the spring can be obtained by setting M ₁ = φ ₁ k ≧ W · c.

The case where the present invention is applied to the chucking lid of the compact disc player has been described above, but the present invention is not limited to this embodiment, and various modifications can be made without departing from the gist of the present invention. Further, it is needless to say that it can be applied to a chucking lid of a disc-shaped recording medium such as another optical disc.

[Effect of device]

As described above, according to the present invention, the spring member for opening the chucking lid of the disk-shaped recording medium restores the flexible portion with the biasing force that opposes the attraction force of the chucking member at the beginning of opening the lid. It is generated by force to urge the lid to open, and thereafter, the restoring force of the flexible portion on the lid continuously shifts to the urging force of the spring member itself to act, and the lid is released after chucking is released. With this structure, the chucking lid can be released smoothly from the chucking release operation to a good feeling and the lid does not open suddenly, preventing damage to the pivot and deformation of the lid itself. And has the effect of withstanding long-term use.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a compact disc player to which the present invention is applied, FIG. 2 is a sectional view of the same with a lid open, FIGS. 3A and 3B are explanatory views of a spring member, and FIG. FIG. 4 is a sectional view of a part of a conventional compact disc player. In the figure, (1) is a box, (3) is a turntable, (4)
Is a lid, (6) is a chucking member, (10) is a spring member,
(10c) is a bent front end portion, and D is a disk as a disk-shaped recording medium.

Claims (1)

[Scope of utility model registration request] 1. A lid provided with a chucking member for chucking a disk-shaped recording medium on a rotating mechanism by an attractive force is rotatably supported with respect to the box body, and between the lid and the box body. A spring member for urging the lid in the opening direction is interposed, and a front end of the spring member is engaged with the lid to urge the lid in the opening direction and an intermediate portion closes the lid. In this case, the restoring force of the flexible portion of the spring member acts at the beginning of opening the lid when the lid is opened, and thereafter the spring member itself continues from this restoring force. A lid opening / closing device for a disk-shaped recording medium, wherein the lid is opened by the urging force of.