JPH07244938A - Optical pickup feeding mechanism for optical disk device - Google Patents

Abstract

PURPOSE:To provide an optical pickup feeding mechanism preventing track skip due to vibration. CONSTITUTION:A screw rod 1 is screwed with a female screw part 7a of an optical pickup holding part 7, and is rotation driven. Both ends of the screw rod 1 are machined to ball shape parts 1a and 1b. An acicular protrusion is provided in the center of left side ball shape part la of the screw rod 1. The left side of the screw rod 1 is supported by a bearing 2 and a press leaf spring 5, and the right side is supported by the bearing 3 and the press leaf spring 6. The right side of the screw rod 1 is energized by a thrust leaf spring 4, and the acicular protrusion of the left end is in pressurized-contact to the inner surface of the bearing 2, and the backlash in the thrust direction of the screw rod 1 is suppressed. An optical pickup 7 is supported by the screw rod 1 and a rail 8, and is transferred and guided by the screw rod 1. In such a manner, the screw rod 1 is pressed by the thrust leaf spring 4, and the acicular protrusion 1c provided on the center is dug into the inner surface of the bearing 2, and the position of the center of the screw rod 1 becomes constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact disc (CD) player, a laser disc (LD) player,
The present invention relates to an optical disc device such as a magneto-optical disc (MD) recording / reproducing device, and more particularly to an optical pickup feeding mechanism thereof.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional optical pickup feeding mechanism of a CD player. The threaded rod 1 shown in the figure is screwed into a female thread of the optical pickup 7 and is rotationally driven. Screw rod 1
Both ends are processed into spherical portions 1a and 1b, the left side is supported by the bearing 2 and the holding leaf spring 5, and the right side is supported by the bearing 3 and the holding leaf spring 6.

The right end of the screw rod 1 is biased by a thrust leaf spring 4, and the spherical portion 1a on the left side is pressed against the inner surface of the bearing 2 to press the play in the thrust direction of the screw rod 1. The optical pickup 7 is supported by the screw rod 1 and the rail 8, and the screw rod 1
Will be sent to you and will be guided again.

Therefore, it is important that the position of the threaded rod 1 is stable, but there is a radial gap between the threaded rod 1 and the bearing 2, and the optical pickup 7 is vibrated during the reproduction.
Was moved, which caused the track to fly.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide an optical pickup feeding mechanism for an optical disk device capable of preventing track jumping due to vibration or the like. Especially.

[0006]

An optical pickup feeding mechanism of an optical disk device according to the present invention is provided with a center of one end face of a shaft which engages with an engaging member provided in an optical pickup holding portion to feed and guide the optical pickup. A needle-like protrusion is provided and the other end face is urged by a spring to press the tip of the needle-like protrusion against the inner surface of the bearing.

[0007]

According to the optical pickup feeding mechanism of the optical disk device of the present invention, when the shaft is pushed by the spring, the needle-like projection provided at the center of the end face bites into the inner side surface of the bearing, and the position of the center of the shaft is reached. Becomes immutable. Therefore, track jump due to vibration during disk reproduction is prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical pickup feeding mechanism of an optical disk device according to an embodiment of the present invention will be described with reference to the drawings. Figure 1
The optical pickup feeding mechanism of the embodiment is shown in FIG. The threaded rod 1 shown in the figure is screwed into the female thread portion 7a of the optical pickup holding portion 7 and is rotationally driven. Both ends of the screw rod 1 are processed into spherical portions 1a and 1b. As shown in detail in FIG. 2, a needle-shaped projection 1c is provided at the center of the left spherical portion 1a.

The left side of the screw rod 1 is supported by the bearing 2 and the holding leaf spring 5, and the right side is supported by the bearing 3 and the holding leaf spring 6. The right end of the screw rod 1 is biased by the thrust leaf spring 4, and the needle-like protrusion 1c at the left end is pressed against the inner surface of the bearing 2 to press the play in the thrust direction of the screw rod 1. The optical pickup 7 is supported by a screw rod 1 and a rail 8 and is fed and guided by the screw rod 1.

Thus, the screw rod 1 is the thrust leaf spring 4
The needle-shaped protrusion 1c provided at the center of the bearing 2
And the position of the center of the screw rod 1 remains unchanged.
Therefore, track jump due to vibration during disk reproduction is prevented.

FIG. 3 shows a modification of this embodiment. In this example, the left end of the screw rod 1 is a flat surface with an R shape.
A needle-shaped protrusion 1c is provided at the center thereof. By making the threaded rod end surface spherical or R-shaped in this way, wear of the bearing end surface due to aging can be minimized.

[0012]

According to the optical pickup feeding mechanism of the optical disk device of the present invention, it is possible to prevent the track jump due to vibration, which is a problem in the conventional product, at almost the same cost as that of the conventional product, and therefore the track jump is caused. It is possible to prevent skipping.

[Brief description of drawings]

1A is a plan view showing an optical pickup feed mechanism of a CD player according to an embodiment of the present invention, FIG.
(B) is the same side view.

FIG. 2 is a partial detailed view of the embodiment.

FIG. 3 is a partial detailed view showing a modified example of the same embodiment.

FIG. 4 is a plan view showing an example of an optical pickup feeding mechanism of a conventional CD player.

[Explanation of symbols]

 1 Screw rod (shaft) 2 Bearing 3 Bearing 4 Thrust leaf spring 5 Holding leaf spring 6 Holding leaf spring 7 Optical pickup holding portion 7a Female thread portion 8 Rail

Claims (1)

[Claims] 1. A needle-like projection is provided at the center of one end surface of a shaft which engages with an engaging member provided on an optical pickup holding portion to feed and guide the optical pickup, and the other end surface is biased by a spring. As a result, the tip of the needle-like protrusion is pressed against the inner surface of the bearing, so that the optical pickup feeding mechanism of the optical disk device.