JPS61271663A - Disc player - Google Patents

Abstract

PURPOSE:To attain the miniaturization of a device and cost reduction by providing a cam member using a drive means so as to drive a movement member on a base member and shaking in the relative direction plural support means of a spindle motor in response to the reciprocating movement of a moving member. CONSTITUTION:A gear 3 is driven together with a pulley 7 via a worm 10, a worm wheel 8 and a belt 6 by driving a motor 11 and the moving member 2 on the base member 1 is reciprocated via a rack 2 meshing with the gear 3. In response to the reciprocation, pins 12b, 13b sliding the cam 18a of the cam 18 are moved along the cam 18a. Through the movement, support member 12, 13 supporting the pints 12b, 13b are shaken relatively against the energizing force of springs 19, 20 around the pins 12a, 13a and spindle motors 15, 16 supported by the support members 12, 13 are shaken relatively attended with them.

Description

TECHNICAL FIELD The present invention relates to a disc player, and more particularly to a disc player that is capable of playing a plurality of types of discs having different outer diameters.

BACKGROUND ART Recently, disc players that can play both optical video discs and compact discs have been developed. Spindle motors are used to rotate these discs, but optical video discs and compact discs differ greatly in the dimensions stipulated by the disc standards, such as center hole diameter, clamping area, and signal start diameter. Therefore, it has been difficult to create a spindle motor that can hold both disks in common.

In addition, in order to accurately trace the bits (dents) carved in micron order on the disk, it is necessary to have extremely accurate pickup performance and to control the rotation of the disk. Since the playback rotation speed of an optical video disc, which has a larger outer diameter and weight than a compact disc, is relatively high, a spindle motor or the like that rotates the disc is required to be suitable for high-load, high-speed rotation.

On the other hand, compact discs are small and lightweight, weighing approximately 1/10 of optical video discs, and their playback speed is low.When driving them in rotation, they are easily affected by cogging and torque fluctuations, and extremely high-precision rotation is required. It is necessary to take control.

For the above-mentioned reasons, in disc players that have already been developed, dedicated spindle motors are provided for each of the optical video disc and the compact disc, instead of using a common spindle motor. Although optical disc players and compact discs have the above-mentioned differences, they both focus a laser beam on the bit through a transparent resin surface and read information signals by the reflected light. , a format is adopted in which information signals from both discs are read by a single pickup.

FIG. 3 schematically shows the main parts of a disc player that has already been developed. As shown in the figure, a first spindle motor 32 that rotationally drives an optical video disk (not shown) and a second spindle motor 33 that rotationally drives a compact disk (not shown) are arranged so that their rotational center axes intersect. and is attached to the support 34.

The support body 34 is rotatably supported by a rotation support shaft 35 that extends perpendicularly to the plane of the rotation center axes of both spindle motors and is located at the intersection of the rotation center axes of the two spindle motors. . A stopper 36 is provided that engages with a pin 34α protruding from the side surface of the support 34 to stop the support at a predetermined rotation angle position. That is, by rotating the support body 34, both spindle motors 32 and 33 are alternately positioned at the disk rotation drive position.

In a disc player with such a configuration, since the support body 34 rotates greatly when the first spindle motor 32 and the second spindle motor 33 reciprocate, a large space must be provided in the player housing, and the disc The entire player was large. Furthermore, since the relative positional dimension with the optical pickup means needs to be highly accurate, the one-car spindle motor must be accurately positioned at the disk rotation drive position (the position of the spindle motor 32 in FIG. 3). However, the positioning mechanism for this purpose is complicated and expensive, and its adjustment is not easy.

SUMMARY OF THE INVENTION The present invention was conceived in view of the above-mentioned problems, and its object is to provide a disc player that is easy to downsize and reduce costs.

A disc player according to the present invention includes a base member, a movable member provided on the base member so as to be able to reciprocate in a predetermined direction, a driving means for driving the movable member, and a movable member provided on the movable member so as to be swingable. a plurality of support members each supporting a spindle motor at its free end; and cam means provided on the base member for swinging the support members in a direction relative to each other in response to reciprocation of the movable member. It is characterized by having

Embodiments Hereinafter, a disc player as an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, a longitudinally movable member 2 is disposed on a flat base member 1, and is attached to the base member so as to be able to reciprocate in the longitudinal direction (direction indicated by the arrow). ing. A longitudinal protrusion 2α is provided at the lower end of the movable member 2 over substantially the entire length of the movable member, and a rack portion 26 is formed on the lower surface of the protrusion. A gear 3 meshes with the rack portion 2b. The gear is connected to an output shaft of a motor 11 via a pulley 5, a belt 6, a small pulley 7, and a worm wheel 8 and a worm 10, which are integrally molded with the gear. Note that the worm wheel 8, motor 11, etc. are attached to a bracket 12 fixed to the lower surface of the base member 1.

Both ends of the movable member 2 are bent at right angles to the direction of movement of the movable member, in this case, upward (in the direction of both arrows), and the both ends are bent portions 2c.

A pair of support members 12 and 13 are swingably attached to each distal end of 2d via bins 12α and 13cL. However, the rocking direction of each support member 12 , 13 is in a plane perpendicular to the main surface of the base member 1 . Spindle motors 15 and 16 are attached to the respective free ends of support members 12 and 13 via leg members 15α, 16α and support plates 156 and 166. The spindle motor 15 is for rotating an optical video disc (described later) with an outer diameter of 300 rII and or 20 mm, and is suitable for high-load, high-speed rotation. Also, the other spindle motor 16 has a compact disk 1 with an outer diameter of 123.
This is for rotating 7.

Each spindle motor 15.16 on the base member 1
A cam body 18 is provided on the side. A cam portion 18cL is formed at the upper end of the cam body 18, and the cam portion is connected to the bottle 1 protruding from the free end of each support member 12.13.
2&, is in sliding contact with 13b. The cam portion 18α is formed such that each support member 12, 13 swings in a direction relative to each other in accordance with the reciprocating motion of the moving member 18. The projecting pins 12b and 13b are biased by coil springs 19 and 20 so as to be pressed against the cam portion 18α.

FIG. 2 shows the state after the moving member 2 has moved, and the spindle motor 16, which was in the disk rotation drive position in the state of FIG. The spindle motor 15 for rotational driving has reached the disk rotational driving position.

In this embodiment, the bottles 126 and 13b protruding from each support member 12 are in direct sliding contact with the cam part Lea, but a rotating roller is attached to each bottle, and this roller rolls on the cam part 18α. It is also possible to have a configuration that moves.

Further, the upper part of the cam body 18 is a cam part 18cL, and the cam part is a bin 12b.

136 are simply brought into sliding contact, but if the cam portion 18z is made into a so-called cam groove and the pins 126, 136 move within this cam groove, the coil springs 19.
20 becomes unnecessary.

Effects of the Invention As detailed above, the disc player according to the present invention includes a base member, a telescopic member provided on the base member so as to be able to reciprocate in a predetermined direction, and a driving means for driving the moving member. A plurality of support members are swingably provided on the movable member and each supports a spindle motor at its free end, and a plurality of support members are provided on the base member and are movable to each other in accordance with the reciprocating motion of the movable member. cam means for swinging in relative directions. That is, each spindle motor is supported by a separate support member, and each spindle motor is moved by swinging each support member.

Therefore, compared to a disk player in which each spindle motor is mounted on a single support (34) and the movement of each spindle motor is achieved by rotating the support, the movement of the spindle motors is In addition, the space provided within the player housing is small, making it easier to downsize the entire disc player. Mata,
In order to accurately position each spindle motor at the disk rotation drive position (the position of the spindle motor in the first position, and the position of the spindle motor in Fig. 2), it is necessary to simply set the stopping position of the moving member with high precision. Often, a complicated positioning mechanism for performing this positioning is not required, making it easy to reduce costs.

[Brief explanation of drawings]

Fig. 1 is a front view including a partial cross section of the main parts of the disc player according to the present invention, Fig. 2 is a diagram for explaining the operation of the main parts, and Fig. 3 is a front view of the disc player that has already been developed. FIG. 2 is a diagram schematically showing main parts. Explanation of symbols of main parts 1... Base member 2... Moving member 12.1
3...Support member 15.16...Spindle motor 17...Compact disk 18...Cam body

Claims (1)

[Claims] a base member; a movable member provided on the base member to be reciprocally movable in a predetermined direction; a drive means for driving the movable member; and a spindle provided at a free end of each movable member. A disk characterized in that it has a plurality of support members supporting motors, and a cam means provided on the base member to swing each of the support members in a relative direction to each other in accordance with the reciprocating motion of the moving member. player.