JP2001126419A - Optical pickup feed mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup feed mechanism for not generating the play of a lead screw even when large impact force in an axial direction is added to the lead screw. SOLUTION: In this optical pickup feed mechanism for engaging an optical pickup 1 with the lead screw 3 and feeding the optical pickup 1 by the rotation of the lead screw 3, the lead screw 3 is energized by a coaxially arranged compression coil spring 9 and the shaft end is brought into press contact with a thrust bearing part 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD player and a D
The present invention relates to an optical disk device such as a VD player, and particularly to an optical pickup feed mechanism.

[0002]

2. Description of the Related Art An example of an optical pickup feeding mechanism in a conventional optical disk device such as a CD player or a DVD player will be described with reference to FIG. The lead screw 3 shown in the figure is rotatably supported by a blind bearing 11 and a radial bearing 4 fixed to a chassis (not shown), and is screwed with an optical pickup (not shown).

The optical pickup has a guide rod (not shown) arranged in parallel with the lead screw 3 inserted therethrough, and is fed by the rotation of the lead screw 3. The lead screw 3 is driven to rotate via a gear 3a fixed to the lead screw 3. A leaf spring 13 is fixed to a support member 12 fixed to a chassis (not shown). The leaf spring 13 presses the lead screw 3 against the blind bearing 11 to eliminate play of the lead screw 3.

[0004]

In the conventional optical pickup feed mechanism described above, the resiliency of the leaf spring 13 is set so that the lead screw 3 can rotate smoothly and play does not occur in the lead screw 3.

However, when a large impact force is applied to the lead screw 3 in the direction of the leaf spring 13, the leaf spring 13 may be pushed by the lead screw 3 and deform beyond the elastic limit. In this case, the leaf spring 13 cannot apply necessary pressure to the lead screw 3, and the lead screw 3 may move in the axial direction and generate abnormal noise.

The present invention has been made in view of the above points, and an object thereof is to prevent the play of the lead screw from occurring even when a large axial impact force is applied to the lead screw. An object of the present invention is to provide an optical pickup feeding mechanism.

[0007]

According to the present invention, there is provided an optical pickup feeding mechanism for engaging an optical pickup with a lead screw and feeding the optical pickup by rotation of the lead screw. And a shaft end thereof is pressed against a thrust bearing portion by being urged by a compression coil spring disposed in the shaft.

In the optical pickup feed mechanism, the compression coil spring is interposed between a tip end of an adjusting screw screwed into a bracket through which the lead screw is inserted and a shaft end of the lead screw.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical pickup feed mechanism according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an optical pickup feeding device according to an embodiment of the present invention, FIG. 2 is a partial sectional view of the optical pickup feeding mechanism, and FIG. 3 is an exploded perspective view showing a part of the optical pickup feeding mechanism.

The lead screw 3 shown in the figure is rotatably supported by a blind bearing 11 and a bracket 7 fixed to a chassis (not shown). That is, the lead screw 3 has one end fitted to the blind bearing 11 and the other end fitted to the hole of the bracket 7. In this embodiment, the bracket 7 has a function of a radial bearing.

A pivot receiver 8 and a compression coil spring 9 are further inserted into the hole of the bracket 7 from the side opposite to the lead screw 3 and the male screw 10 is provided in the hole of the bracket 7 and is screwed into the screw 7a. The compression coil spring 9 presses the shaft end of the lead screw 3 to the blind bearing 11 via the pivot receiver 8.

Gear 3a fixed to lead screw 3
Is engaged with a gear 5 a fixed to a rotating shaft of a motor 5 fixed to the chassis, and the lead screw 3 is driven to rotate by the motor 5.

An optical pickup 1 having an objective lens 2 is inserted with a lead screw 3 and a guide rod 6 supported by a chassis in parallel with the lead screw 3. Further, a claw 1a provided on the optical pickup 1 is pressed against the lead screw 3. It is screwed in a state.

An optical disk (not shown) is clamped on a turntable fixed to a rotating shaft of a disk motor, and is rotated at a position where its recording surface faces the objective lens 2. And the optical pickup 1 is a lead screw 3
And the optical disk is reproduced.

In the embodiment, the lead screw 3 has a left-hand thread. When the lead screw 3 rotates in the illustrated CW direction, the optical pickup 1 is fed in the FW direction. When rotated in the CCW direction, the optical pickup 1 is sent in the BW direction.

The compression coil spring 9 presses the lead screw 3 against the blind bearing 11 to eliminate play of the lead screw 3. The pressure of the compression coil spring 9 can be adjusted while checking that the lead screw 3 rotates smoothly.
Is set by screwing in.

Since the compression coil spring 9 can reduce the distortion of the element wire even if the overall amount of bending is large, it can be designed so that it does not plastically deform even with the maximum bending in the compression direction. In the embodiment, even if a large impact load is applied to the lead screw 3, the deformation of the compression coil spring 9 is prevented from exceeding the elastic limit, so that the lead screw 3 does not rattle.

[0018]

According to the optical pickup feed mechanism of the present invention, the deformation of the compression coil spring does not exceed the elastic limit even when a large impact load is applied to the lead screw, so that play does not occur in the lead screw.

Also, the compression coil spring interposed between the tip of the adjusting screw for screwing into the bracket and the shaft end of the lead screw facilitates the adjustment of the press-contact force for obtaining the play of the lead screw. .

[Brief description of the drawings]

FIG. 1 is a plan view showing an optical pickup feed mechanism according to an embodiment of the present invention.

FIG. 2 is a partial sectional view showing the optical pickup feeding mechanism.

FIG. 3 is an exploded perspective view showing the same part.

FIG. 4 is a plan view showing an example of a conventional optical pickup feed mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical pickup, 1a claw 2 Objective lens 3 Lead screw, 3a gear 4 Radial bearing 5 Motor, 5a gear 6 Guide rod 7 Bracket, 7a female screw 8 Pivot receiver 9 Compression coil spring 10 Male screw 11 Blind bearing 12 Support member 13 Plate Spring

Claims (2)

[Claims] An optical pickup feeding mechanism for engaging an optical pickup with a lead screw and feeding the optical pickup by rotation of the lead screw, wherein the lead screw is biased by a compression coil spring coaxially arranged. An optical pickup feed mechanism wherein the shaft end is pressed against a thrust bearing. 2. The lead screw according to claim 1, wherein said compression coil spring is interposed between an end of an adjusting screw screwed into a bracket through which said lead screw is inserted and a shaft end of said lead screw.
Optical pickup feed mechanism.