JPH064455Y2 - Laser pick-up drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a driving device for a laser pickup, and more particularly to driving a laser pickup in which a worm gear is attached to a motor shaft and a carriage is moved via a worm wheel. It relates to the device.

[Problems to be solved by conventional techniques and devices]

As a drive system of a conventional laser pickup carriage (1), for example, as shown in FIG.
(1) A rack gear (2) is attached to one side, the rotation of the carriage drive motor (3) is reduced by meshing several spur gears (4), (4) ..., and then a pinion gear (5). And the rack gear (2) were combined to drive the carriage (1). Alternatively, as shown in FIG. 4, the rotation of the carriage drive motor (3) is reduced by inserting a rubber belt (8) between the pulley (6) and the pulley (7), and the feed screw (9) is rotated. The carriage (1) was moved by rotating and engaging the engaging piece (10) fixed to one side of the carriage with the feed screw (9). However, the conventional structure has many defects such as a large number of parts and a large mounting space, which causes technical problems to be solved in order to overcome these defects. .

[Means for solving problems]

This invention was proposed as a solution to this problem in view of the above problems. A feed screw is screwed into an engaging piece fixed to one side of a carriage of a laser pickup, and both sides of the chassis upper surface are screwed. Both ends of the feed screw are pivotally supported by the respective projection pieces, and a worm wheel is pivotally attached near one end of the feed screw, and a spring is provided between the worm wheel and the pivot support of one end of the feed screw. A drive device for a laser pickup characterized by interlocking a worm gear, which is urged by interposing and urging, and further, a worm gear axially attached to a carriage drive motor shaft penetrating from a lower surface of a chassis, with the worm wheel. To do.

[Action]

In this invention, a worm gear is attached to the rotary shaft of a carriage drive motor, and the worm gear is meshed with a worm wheel pivotally attached to a feed screw. The rotation of the carriage drive motor is transmitted to the feed screw via the worm gear mechanism, and the rotation of the feed screw moves the engagement piece fixed to one side of the carriage in either the left or right direction. It is a thing. Therefore, when the carriage drive motor rotates in either forward or reverse directions, the carriage also moves in either the left or right direction following this. Moreover, since the feed screw is rotated by the worm gear mechanism, the number of parts is smaller than that of the conventional type, and the space of the speed reducing portion is smaller.

〔Example〕

An embodiment of the present invention will be described below in detail with reference to the attached drawings. For the sake of convenience of description, a structure which is conventionally known will be described at the same time. In FIGS. 1 and 2, (11) is a disk table for rotating a compact disk (not shown), which is a disk rotation motor fixed to the lower surface of the chassis (12).
The disc table (11) is pivotally mounted on the chassis (12) by passing the rotary shaft of (13) through the upper surface of the chassis (12). The chassis (12) is provided with an opening (14) at substantially the center thereof, and projecting pieces (15), (15), (15) and (15) are provided on both sides of the opening (14) in a protruding manner. Further, a protrusion (18) is provided on one side of the carriage (17) of the laser pickup (16), and a guide rod (19) is loosely fitted to the protrusion (18) and the carriage (17) The guide rod (20) is also loosely fitted near the other side portion. Then, both ends of the guide rods (19) (20) are connected to the protruding pieces (15) (15), (1
5) The respective bent portions of (15) are held so that the carriage (17) can slide left and right in the opening (14). In FIGS. 1 and 2 of the present embodiment, an engaging piece (21) provided with a screw portion is fixed to the lower surface of the projecting portion (18), and further, the engaging piece (21) is attached to the engaging piece (21). Screw in the lead screw (22). The shape and mounting position of the engagement piece (21) should not be limited to the above. In addition, projecting pieces (23) and (24) having burring holes are projectingly provided at appropriate positions on both sides of the chassis (12), and both ends of the feed screw (22) are rotatably attached thereto. A worm wheel (25) is axially attached near one end of the feed screw (22), and the worm wheel (25) and the protruding piece (24) are attached.
A spring (27) is interposed between the two so that the feed screw (22) is biased toward the protruding piece (23) side to eliminate play. The details of the attachment means of the feed screw (22) are as follows: First, the burring hole of the projection piece (23) is made smaller than the diameter of the feed screw (22), and the hole of the projection piece (23) is loosened. A stepped portion (26) is provided at the other end of the feed screw (22) for fitting. Then, a spring (27) is interposed on the worm wheel (25) side of the feed screw (22) and inserted into the burring hole of the protruding piece (24),
When the stepped portion (26) of the feed screw (22) is brought into contact with the protruding piece (23), the tip of the stepped portion (26) is burred by the protruding piece (23) by the biasing force of the spring (27). Inserted in the hole. Therefore,
Since the stepped portion 26 is constantly pressed against the protruding piece (23) by the biasing force of the spring (27), even if the feed screw (22) is rotated, the protruding piece (23) (24) inadvertently occurs. There is no fear of falling out. The carriage drive motor (2
8) is fixed, the rotating shaft (29) is penetrated to the upper surface of the chassis (12), and the worm gear (30) is further fitted to the rotating shaft (29), the worm gear (30) and the worm wheel. (25) is formed so that it can be meshed with.

Thus, in the present embodiment, the carriage drive motor (2
The rotation of 8) is reduced by the combination of the worm gear (30) and the worm wheel (25) and transmitted to the feed screw (22). Then, with the rotation of the feed screw (22), the engaging piece
The carriage (17) fixed to (21) is attached to the guide rods (19) (2
It slides left and right along (0).

[Effect of device]

In this invention, as described in detail in the above one embodiment, a worm gear is fitted on the rotary shaft of the carriage drive motor and meshed with a worm wheel axially mounted on the feed screw. Therefore, the number of parts that make up the speed reducer is reduced compared to the conventional type,
Further, since the burring hole formed in the protrusion on the upper surface of the chassis is used as the pivotal support portion of the feed screw, the configuration of the pivotal support portion is simplified and the feed screw can be attached in a short time. Further, the carriage drive motor and the disk rotation motor can be mounted on the same surface of the chassis, the wiring process to the motor terminals and the assembling work can be facilitated, and the cost can be reduced. It is a device.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a plan view and FIG. 2 is a perspective view. 3 and 4 are perspective views showing a conventional example. References (12) …… Chassis (16) …… Laser pickup (17) …… Carriage, (21) …… Engaging piece (22) …… Feed screw, (23) (24) …… Protrusion piece (25) ) …… Warm wheel, (27) …… Spring (28) …… Carriage drive motor (30) …… Worm gear

Claims (1)

[Scope of utility model registration request] 1. A feed screw is screwed into an engagement piece fixed to one side of a carriage of a laser pickup, and both end portions of the feed screw are pivotally supported by projecting pieces on both sides of a chassis upper surface. A carriage drive in which a worm wheel is axially mounted near one end of the feed screw, a spring is interposed between the worm wheel and a pivotal support portion of one end of the feed screw, and further pierced from the lower surface of the chassis. A drive device for a laser pickup, characterized in that a worm gear mounted on a motor shaft is meshed with the worm wheel.