JPH082811Y2 - Optical pickup device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an optical pickup device.

[Conventional technology]

The optical pickup device collimates the laser light emitted from the laser diode into parallel light in the optical system part, converts the parallel light into convergent light in the objective lens part incorporated in the actuator, and accurately converges it into the signal part on the disk. It is a thing.

As described above, in order to accurately converge on the signal portion of the disk, it is necessary to arrange these parts at predetermined positions with extremely high accuracy, but conventionally, these parts are made by aluminum die casting or the like. , Was incorporated into a highly machined metal body. For this reason, the cost is increased, and since the processing conditions are set by a human, the accuracy inevitably varies, the accuracy of mounting on the main body is deviated, and the pickup performance deteriorates.

[Problems to be solved by the invention]

However, in recent years, cost reduction of each component has been required due to cost reduction of the optical pickup device. Therefore, there has been a demand for a method that does not require costly high-level machining of the main body of the optical pickup device. However, with metal such as aluminum die-cast, it is difficult to obtain a high degree of precision and surface roughness only by molding, and it has been sought to solve this problem by integrally molding with plastic from these aspects.

However, in the integral molding of plastic, the screw tightening strength is not sufficient, so that measures from both aspects of materials and structures have been demanded. In particular, the mounting screw part required for fixing to the playback device body is often fixed to a third party, so that there is a problem that it is necessary to give sufficient consideration to strength and accuracy. there were.

The present invention has been made to solve such a problem, and an object of the present invention is to obtain an optical pickup device having a high-precision mounting structure and a screw strength that allows a third party to securely attach it to the playback device main body. It is intended.

[Means for solving problems]

An optical pickup device according to the present invention emits a laser beam onto a disc on which optical information is recorded, receives reflected light according to the information recorded on the disc, and outputs an electric signal corresponding to the information. In the optical pickup device, the body of the optical pickup device is integrally formed of plastic and is thinly formed to have a substantially uniform thickness as a whole, and a screw for attaching the main body of the optical pickup device to the reproducing device body is provided. A plurality of mounting boss portions having holes are formed, the mounting boss portion is projected from the main body of the optical pickup device, and a mounting reference surface for mounting the main body of the optical pickup device to the reproducing device main body is provided at an upper end portion thereof. It was formed.

[Action]

In this invention, a plastic body weak in strength is used, and an optical pickup device main body integrally formed into a thin wall is provided with a mounting reference surface for a reproducing device and a mounting boss portion having a mounting screw hole. Since it is made to project beyond the molded part and the mounting reference surface is formed at its upper end, the effective screw length can be made longer and the mounting strength can be improved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of an essential part of an embodiment of the present invention.

In the figure, reference numeral 1 is a main body of an optical pickup device, which is integrally formed of plastic in which glass and carbon are mixed in appropriate amounts. Reference numeral 2 is a base portion of the main body, 3 is a first protruding rib formed on substantially the entire circumference of the upper surface of the base portion, 4 is a second protruding rib also formed on the substantially lower surface of the base portion, The substantially central portion 5 in the direction is formed higher than the others.

Reference numeral 6 is a mounting boss formed by projecting at the four corners of the upper surface of the base 2. The upper end is formed so as to be flush with the mounting reference surface 6a at the upper end, and screw holes are provided at substantially the center. 7 is provided.

Reference numeral 8 is a boss portion having a pair of reference holes 9 formed slightly lower than the mounting boss portion 6.

Reference numeral 10 is an actuator attachment boss portion for fixing an actuator portion 20 described later, and through holes 11 are formed in each.

Reference numeral 12 denotes a cylindrical portion to which an optical holder (not shown) for accommodating optical system components (not shown) is mounted, and is formed to have substantially the same thickness as the base portion 2. Reference numeral 13 is a receiving portion to which a photodetector (not shown) is attached, and a through hole 14 communicating with the cylindrical portion 12 is formed.

Reference numeral 15 denotes a substantially circular rib formed so as to project toward the base portion 2 side, and 16 is a mounting portion for mounting a circuit portion 23 for controlling the emission power of a laser diode (not shown) to be constant.

FIG. 2 is a use state diagram of an optical pickup device according to an embodiment of the present invention.

In the figure, 20 is an actuator part that movably houses an objective lens 21, 22 is a cover that protects a laser diode (not shown), 23 is a circuit part that keeps the output power of the laser diode constant, and 25 is a screw, the actuator part. 20 is attached and fixed to the main body 1 via a washer 26.

Reference numeral 27 denotes a part of the reproducing apparatus main body, which is a mounting plate for mounting the optical pickup device, out of the four mounting boss portions 6.
The body 1 is screwed on by screws 28 at at least three locations. 29 is an optical disk such as a compact disk.

In the above-mentioned configuration, the main body 1 is formed to have a substantially uniform thickness as a whole so as to enhance the molding accuracy. The four mounting boss portions 6 are screwed to the mounting plate 27 of the reproducing apparatus main body. By providing the mounting reference surface 6a and the screw hole 7, it is possible to prevent deterioration of accuracy when the screw 28 is mounted.

Therefore, there is no decrease in screw tightening strength, and
The accuracy of the main body 1 can be improved.

Further, since the whole can be made thin, sink marks and distortions are reduced, and therefore residual stress is small and stress released due to temperature stress during use is small. Therefore, the structure has less deformation.

It goes without saying that the structure of the mounting plate 27 of the reproducing apparatus main body can be simplified by making the upper surface of the mounting boss portion 6 flush.

As described above, the main body 1 formed by integral molding of plastic is thin and uniform in thickness as a whole so that the molding accuracy can be maximized, and the screw hole 7 requiring strength is formed.
It is designed to allow the effective screw length to be long by making it project, and the consideration is given to the use of a plastic material with low strength.

[Effect of device]

As described above, the invention emits a laser beam onto a disc on which optical information is recorded, receives reflected light according to the information recorded on the disc, and outputs an electric signal corresponding to the information. The optical pickup device is provided with a main body of the optical pickup device which is integrally formed of plastic and has a thin thickness so as to have a substantially uniform thickness as a whole, and a screw hole for attaching the main body of the optical pickup device to the reproducing device main body. A plurality of mounting bosses having a plurality of mounting bosses, the mounting bosses protruding from the main body of the optical pickup device, and a mounting reference surface for mounting the main body of the optical pickup device to the playback device main body at the upper end thereof. As a result, the mounting boss that is formed so as to project from the main body of the optical pickup device is integrally molded with plastic. More resulting in overall optical pickup apparatus upon thin and lightweight, the reduction of the mounting strength between the optical pickup apparatus body and the reproduction apparatus main body can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of an embodiment of the present invention, and FIG. 2 is a state of use thereof. In the figure, 1 is a main body of the optical pickup device, 6 is a mounting boss portion, 7 is a screw hole, and 27 is a mounting plate of the reproducing device main body.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Ito 800 Iwamatsu, Oshima-cho, Nitta-gun, Gunma Sanryo Electric Co., Ltd. Gunma Manufacturing Co., Ltd. (56) Bibliography 60-146932 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An optical pickup device which emits a laser beam onto a disc on which optical information is recorded, receives reflected light according to the information recorded on the disc, and outputs an electric signal corresponding to the information. In the above, a main body of the optical pickup device is integrally formed of plastic and is formed thin to have a substantially uniform thickness as a whole, and a plurality of screw holes for attaching the main body of the optical pickup device to the reproducing device main body are provided. The mounting boss portion is formed, the mounting boss portion is projected from the main body of the optical pickup device, and a mounting reference surface for mounting the main body of the optical pickup device to the playback device main body is formed at an upper end portion thereof. Characteristic optical pickup device.