JP2000090600A - Optical pickup feeding mechanism for mini disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the revolving speed of a motor till a feed member drops to grooves of a lead screw by providing plural threads on a lead screw as for a feed mechanism feeding an optical pickup by the rotation of the lead screw to increase a feed rate per rotation of a lead screw. SOLUTION: An optical pickup is fed by the rotation of a lead screw 1 by attaching a feed member to a spring which is to be provided in the pickup and making the member to be in press-contact with the lead screw 1. An optical pickup feeding rate per rotation of the lead screw 1 is made larger by providing plural threads of grooves per one pitch of the screw 1. Moreover, since widths of flat parts of mountains and of valleys are small, the number of revolutions of a motor after the feed member runs on mountains of the lead screw 1 till the member drops to the grooves of the screw 1 is made low. Therefore, the optical pickup can be fed at high speed and a feeding operation can be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup feed mechanism for a mini disc reproducing apparatus, and more particularly to an optical pickup feed mechanism for positioning and stopping an optical pickup with a feed member riding on a lead screw mountain. .

[0002]

2. Description of the Related Art FIG. 5 shows an example of an optical pickup feed mechanism of a conventional mini disk reproducing apparatus. The lead screw 1 shown in the figure is rotatably supported at both ends by a thrust guide 9 and bearings 2 and 3, and rotation of the motor 4 is transmitted via pulleys 5 and 6, belts and gears 7 and 8.

The optical pickup 10 is supported by a guide rod (not shown) so as to be movable in the outer and inner circumferential directions of the disk. A feed member 10b is fixed to the lower surface of a leaf spring 10a provided on the optical pickup 10, and is pressed against the groove of the lead screw 1 by the elastic force of the leaf spring 10a.

When the optical pickup is stopped at the inner circumferential position, it is necessary to stop the optical pickup accurately because the TOC area of the disk is narrow. Therefore, after the inner peripheral position of the optical pickup 10 is detected by a switch (not shown), the lead screw 1 is further rotated, and the optical pickup 10 is brought into contact with the positioning stopper 11 and stopped. When the lead screw 1 rotates with the optical pickup 10 stopped, as shown in FIG.
The feed member 10b rides on the mountain of the lead screw 1. In FIG. 2, the feed member 10b is in a normal feed state.
Is drawn by a dotted line, and the code lead line at the position where the feed member 10b rides on the mountain of the lead screw 1 is shown by a solid line.

[0005]

In the above-mentioned conventional optical pickup feed mechanism, if the lead screw 1 is reversed from the state where the feed member 10b rides on the ridge of the lead screw 1, the feed member 10b is
When the pitch of the lead screw is increased as shown in FIG. 3 in order to increase the feed amount per rotation of the lead screw, the rotation of the motor until the feed member 10b falls into the groove of the lead screw 1 The number must be increased and the amount of rotation is also unstable. Therefore, the pitch of the lead screw could not be widened.

At present, the pitch of the lead screw is narrowed to reduce the number of rotations before the feed member rides and falls into the groove, thereby stabilizing the time. However, the feed amount per rotation is reduced. . If the pitch of the lead screw is too narrow and there is no flat outer peripheral portion as shown in FIG. 4, the lead screw cannot be gripped during the cutting process and cutting becomes difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made to increase the feed amount per rotation of a lead screw, and furthermore, after the feed member rides on the lead screw ridge, the feed member is connected to the lead screw. It is an object of the present invention to provide an optical pickup feed mechanism of a mini disc reproducing apparatus that can reduce the number of rotations of a motor before dropping the motor into a screw groove.

[0008]

An optical pickup feeding mechanism of a mini disc reproducing apparatus according to the present invention is configured such that a feeding member is attached to a spring provided on the optical pickup and is pressed against a lead screw, and the optical pickup feeds the optical pickup by rotating the lead screw. In the pickup feeding mechanism, the lead screw has a plurality of threads.

[0009]

Embodiments of the present invention will be described with reference to the drawings. The optical pickup feeding mechanism of the embodiment is shown in FIG.
In the mechanism shown in FIG. 1, a lead screw 1 shown in FIG. 1 is used as a lead screw. This lead screw is provided with two grooves in one pitch.

By making the lead screw multi-rows, the feed amount of the optical pickup per rotation of the lead screw 1 can be increased, and the flat portions of the peaks and valleys have a small width. After the feed member rides on the peak of the lead screw 1, the number of rotations of the motor until the feed member falls into the groove of the lead screw 1 can be reduced.

Although the embodiment shows an example in which the number of lead screws is two, the number of lead screws may be three or more.

[0012]

According to the optical pickup feed mechanism of the mini disc reproducing apparatus of the present invention, the feed amount per rotation of the lead screw is increased, and the optical pickup is brought into contact with the positioning stopper while the lead screw is rotated. After the feed member is stopped by being brought into contact with the optical pickup and the feed member provided on the optical pickup rides on the ridge of the lead screw 1, the number of rotations of the motor until the feed member falls into the groove of the lead screw can be reduced. Therefore, the optical pickup can be sent at a high speed, and the optical pickup sending operation is stabilized.

[Brief description of the drawings]

FIG. 1 is a front view showing a part of a lead screw used in an embodiment of the present invention.

FIG. 2 is a front view showing a part of a lead screw used in an optical pickup feed mechanism of a conventional mini-disc reproducing apparatus.

FIG. 3 is a front view showing a part of another example of the lead screw used in the optical pickup feed mechanism of the conventional mini-disc reproducing apparatus.

FIG. 4 is a front view showing a part of still another example of the lead screw used in the optical pickup feed mechanism of the conventional mini-disc reproducing apparatus.

FIG. 5 is a plan view showing an example of an optical pickup feed mechanism using a lead screw.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lead screw 2, 3 Bearing 4 Motor 5, 6 Pulley 7, 8 Gear 9 Thrust guide 10 Optical pickup, 10a Leaf spring, 10b Feed member 11 Positioning stopper

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masato Yamamoto 1-14-6 Dogenzaka, Shibuya-ku, Tokyo Inside the Kenwood Corporation (72) Inventor Takahiro Asano 1-14-6 Dogenzaka, Shibuya-ku, Tokyo Stock Company F term in the company Kenwood (reference) 5D068 AA02 BB01 CC03 GG13

Claims (1)

[Claims] 1. An optical pickup feeding mechanism in which a feed member is attached to a spring provided on an optical pickup and pressed against a lead screw to feed the optical pickup by rotation of the lead screw, wherein the lead screw has a plurality of leads. Optical pickup feed mechanism for mini disc playback device.