JP2902876B2 - Pickup drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickup driving device for reading a signal recorded on a disk.

[0002]

2. Description of the Related Art An optical disk player for reading a signal recorded on a disk using an optical pickup has become widespread, and such a pickup is moved in a radial direction of the disk by a driving force of an electric motor. Is configured. As a device for driving such a pickup, there are various types, and a technology for linearly driving the pickup by meshing a spur gear with a gear driven and rotated by an electric motor is described in, for example, Japanese Utility Model Publication No. 4-24486. I have.

[0003]

As a typical optical disc player, a CD player is well known. Some of such CD players are configured to listen to reproduced sound by headphones. There is a portable CD player of the headphone stereo type.

[0004] Such portable CD players are:
Since it is used in a portable manner, it is necessary to reduce the size, especially the thickness, and to consider the influence of vibration.

The above-mentioned publication describes a technique for driving a pickup by meshing a drive gear rotationally driven by an electric motor with a spur gear. The spur gear generates an elastic force generated by a curved portion. Thus, a meshing operation with the drive gear is performed. In such a configuration, the spur gear, the curved portion, and the like are integrally formed of a synthetic resin, and are attached and fixed to a support member that supports the pickup main body with a screw or the like.

[0006] Therefore, such a configuration requires parts for mounting and fixing, so that not only the number of assembling steps is increased but also the size of the driving device is not suitable.

An object of the present invention is to provide a pickup driving device in which the above points are improved.

[0008]

A drive device according to the present invention is guided by a cylindrical guide shaft in a radial direction of a disk and is rotatably driven by an electric motor and a pickup support member on which a pickup is fixed. And a spur gear attached to the guide shaft so as to be slidably displaced integrally with the pickup supporting member and meshing with the drive gear, and rotatable with respect to the guide shaft. And a driving member provided.

[0009]

According to the present invention, a driving member formed with a spur gear meshing with a driving gear is slidably and rotatably mounted on a guide shaft, and the spur gear is rotated by a spring in a direction meshing with the driving gear. It is designed to be energized.

[0010]

FIG. 1 is a plan view of a main part showing a pickup driving apparatus according to the present invention, and FIG. 2 is a sectional view taken along a line AB in FIG. In the drawing, reference numeral 1 denotes a columnar guide shaft which is attached to a fixed substrate (not shown) and reference numeral 2 denotes a pickup support member to which a pickup 3 is fixed, and is formed on mounting leg pieces 4 and 5. The guide shaft 1 is inserted into the hole so that the disk can slide in the radial direction.

Reference numeral 6 denotes a drive gear rotatably provided by a shaft 7, and is configured to be rotationally driven by an electric motor (not shown) when the pickup 3 moves. Reference numeral 8 denotes a drive member in which a spur gear 9 meshing with the drive gear 6 is formed in a straight line parallel to the guide shaft 1, and comes into contact with the mounting leg pieces 4 and 5 formed on the pickup support member 2. The guide shaft 1 is slidably and rotatably mounted by inserting the guide shaft 1 into holes formed in the abutting mounting portions 10 and 11 and the mounting portion 12 formed as described above.

Numeral 13 denotes a spring mounting member which is formed on the opposite side of the driving member 8 from the position where the spur gear 9 is formed, and on which a coil spring 14 is wound. The free end of the mounted coil spring 14 is
Is in contact with the side wall 2a. Therefore, the driving member 8 is rotated clockwise about the guide shaft 1 by the urging force of the coil spring 14 (FIG. 2).
To be biased. Since the rotation urging force of the driving member 8 acts in the direction in which the spur gear 9 meshes with the driving gear 6, the meshing state between the spur gear 9 and the driving gear 6 can be favorably maintained.

The driving device of the present invention is configured as described above. In such a configuration, when the electric motor for pick-up rotation rotates, the driving gear 6 is driven to rotate clockwise or counterclockwise. When the driving gear 6 rotates, the driving force is transmitted to the spur gear 9 meshing with the driving gear 6, so that the driving member 8 on which the spur gear 9 is formed moves in the axial direction of the guide shaft 1. The sliding displacement is caused by receiving the displacement force.

When the driving member 8 slides and displaces in the axial direction of the guide shaft 1, the contact mounting portions 10 and 11 formed on the driving member 8 are attached to the mounting leg pieces 4 formed on the pickup supporting member 2. And 5, the pickup supporting member 2 is slid and displaced together with the driving member 8.

Since the pickup supporting member 2 moves while being guided by the guide shaft 1 in this manner, the pickup 3 fixed to the pickup supporting member 2 is moved.
Is moved in the radial direction of the disk. Therefore, a signal recorded on a disk that is rotated by a turntable (not shown) is read by the pickup 3.

In this manner, the movement of the pickup 3 by the engagement of the drive gear 6 and the spur gear 9 is performed. When such an operation is performed, the rotational urging force of the drive member 8 by the coil spring 14 is reduced by the spur gear. Acting on the meshing between the drive gear 9 and the drive gear 6, the movement of the pickup 3 can be smoothly performed without rattling or the like in the meshing operation.

Although various mechanisms for biasing the drive member 8 to rotate are conceivable, when the drive gear 6 is constructed as in this embodiment, that is, when the coil spring 14 is disposed on the opposite surface of the spur gear 9, the drive gear 6 is rotated. Reaction force and coil spring 14
And the acting force from the driving member 8
However, since the loss of the bending moment applied to the guide shaft 1 is small, there is an advantage that a driving operation with a small friction loss can be performed.

[0018]

According to the present invention, the driving member having the spur gear meshing with the driving gear is not merely urged to rotate in the direction in which the spur gear meshes with the driving gear, but is urged. Since the coil spring provided as the means is arranged on the side opposite to the position where the spur gear is formed, the reaction force received from the drive gear and the acting force from the coil spring act on the same line. As a result, there is an effect that the loss of the bending moment applied to the guide shaft by the drive member can be reduced. Therefore, according to the present invention, the loss due to friction between the guide shaft and the driving member can be reduced, and the movement of the pickup can be performed smoothly and efficiently.

Further, the driving member is slidably mounted on the guide shaft, and the pickup supporting member, to which the pickup is fixed, is slidably displaced along the guide shaft by the sliding displacement operation. The present invention has the advantage that components for fixing to the pickup supporting member are not required, which is effective in reducing the size of the device and reduces the number of assembling steps.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part showing a pickup driving device of the present invention.

FIG. 2 is a sectional view taken along line AB in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide shaft 2 Pickup support member 3 Pickup 6 Drive gear 8 Drive member 9 Spur gear 13 Spring mounting member 14 Coil spring

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 21/02 G11B 7/085

Claims (1)

(57) [Claims] 1. A pickup support member to which a disk is guided in a radial direction by a cylindrical guide shaft and to which a pickup is fixed, a driving gear driven to rotate by an electric motor, and the pickup mounted on the guide shaft. Attached for sliding displacement integrally with the support member and rotatable with respect to the guide shaft
Spur gear attached to the drive gear and always meshing with the drive gear
And a spur gear of the driving member.
Is formed on the opposite side of the position where
A spring mounting member around which a coil spring is wound
The pickup support of the coil spring
The spur gear is driven by the elastic force caused by contact with the holding member.
A driving device for a pickup , wherein the driving member is rotationally biased in a direction in which the driving member meshes with the driving gear.