JP3219580B2 - 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 Optical disk players which read signals recorded on a disk using an optical pickup have become widespread, and such a pickup is moved by a driving force of an electric motor in a radial direction of the disk. It is configured to: As a device for driving such a pickup, there is a technique for linearly driving a spur gear by meshing the spur gear with a gear driven by an electric motor, which is described in Japanese Utility Model Publication No. 4-24486.

[0003]

As a typical optical disc player, a CD player is generally well known. Some of such CD players are configured to listen to reproduced sound through headphones. There is a portable stereo CD player of the headphone stereo type. Since such a portable CD player is used while being carried, it is required to reduce the size, especially the thickness, and to consider the influence of vibration.

[0004] The above-mentioned publication discloses a technique for driving a pickup by meshing a driving gear and a spur gear which are rotationally driven by an electric motor. Such a spur gear is formed by an elastic force generated by a bending portion. It is configured such that the 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 body with screws or the like.

[0005] Therefore, in such a configuration, parts for mounting and fixing are required, so that not only the number of assembling steps is increased but also the size of the driving device is not suitable. Further, in the technology described in the above-mentioned publication, the movement of the pickup is configured to be performed in cooperation with a cylindrical guide shaft and a guide hole formed in a main body of the pickup. In such a configuration, the main body in which the guide shaft and the guide hole are formed is made of metal.

[0006] In order to prevent such a contact loss between the guide shaft and the guide hole, conventionally, an oilless metal is often press-fitted into the main body. However, in such a method, there is a problem that the cost increases and a sliding loss due to the contact between the metals increases.

An object of the present invention is to provide a pickup driving device in which this point is improved.

[0008]

According to the pickup driving apparatus of the present invention, a spur gear guided by a cylindrical guide shaft in the radial direction of the disk and meshing with the driving gear is formed. A drive member, a pickup support member provided with a mounting leg piece having a guide hole through which the pickup is fixed and the guide shaft is inserted, and a guide formed on the drive member. And a cylindrical portion inserted into the hole.

[0009]

According to the present invention, the pickup supporting member is supported by a driving member moved by an electric motor while the movement of the disk in the radial direction is guided by a cylindrical guide shaft. The shaft is prevented from contacting.

[0010]

1 is a plan view of an essential part showing a pickup driving apparatus according to the present invention, FIG. 2 is a sectional view taken along a line AB in FIG. 1, and FIG. 3 is a sectional view taken along a line XY in FIG.

In FIG. 1, reference numeral 1 denotes a cylindrical guide shaft which is attached and fixed to a fixed substrate (not shown) and is made of metal. Reference numeral 2 denotes a pickup support member to which the pickup 3 is fixed and which is made of metal, and which has mounting leg pieces 6 and 7 in which support holes 4 and 5 having a diameter larger than the diameter of the guide shaft 1 are formed. Is provided.

Reference numeral 8 denotes a driving gear rotatably provided by a shaft 9, and is configured to be rotationally driven by an electric motor (not shown) when the pickup 3 moves. Reference numeral 10 denotes a drive member in which a spur gear 11 meshing with the drive gear 8 is formed linearly in parallel with the guide shaft 1 and is made of synthetic resin. The drive member 10 is formed on the pickup support member 2. Mounting leg pieces 6 and 7
Abutment portion 1 provided with guide holes 12 and 13 into which the guide shaft 1 is inserted.
4 and 15 are formed.

Reference numerals 16 and 17 are formed integrally with the contact mounting portions 14 and 15 and inserted into support holes 4 and 5 formed in mounting leg pieces 6 and 7 of the pickup support member 2. And is configured to support the pickup support member 2 by contact with the support holes 4 and 5.

In such a configuration, the driving member 10 is provided with the guide holes 1 formed in the abutting mounting portions 14 and 15.
The guide shaft 1 is slidably and rotatably attached by inserting the guide shaft 1 into 2 and 13. And
The supporting operation of the pickup supporting member 2 by the driving member 10 is performed by inserting the cylindrical portions 16 and 17 formed in the mounting portions 14 and 15 into the supporting holes 4 and 5. Is performed without hindrance.

Reference numeral 18 denotes a spring mounting member which is formed on the opposite side of the drive member 10 from the position where the spur gear 11 is formed and on which a coil spring 19 is wound. The free end of the mounted coil spring 19 is in contact with the side wall 2a of the pickup supporting member 2. Therefore, the driving member 10 is rotationally urged clockwise (in FIG. 2) about the guide shaft 1 by the urging force of the coil spring 19. Since the rotation urging force of the driving member 10 acts in a direction in which the spur gear 11 meshes with the driving gear 8, the meshing state between the spur gear 11 and the driving gear 8 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 8 is driven to rotate clockwise or counterclockwise. When the driving gear 8 rotates, the driving force is transmitted to the spur gear 11 meshed with the driving gear 8, so that the driving member 10 on which the spur gear 11 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 10 slides and displaces in the axial direction of the guide shaft 1, the contact mounting portion 1 of the driving member 10
The pickup support member 2 supported by the insertion of the cylindrical portions 16 and 17 formed in 4 and 15 into the support holes 4 and 5 is slid and displaced together with the drive member 10. Therefore, the pickup supporting member 2
Is slidably displaced in the axial direction of the guide shaft 1.

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.

As described above, the movement of the pickup 3 by the engagement of the drive gear 8 and the spur gear 11 is performed.
When such an operation is performed, the rotational urging force of the driving member 10 by the coil spring 19 acts on the meshing between the spur gear 11 and the driving gear 8, so that rattling or the like may occur in the meshing operation. Therefore, the moving operation of the pickup 3 can be performed smoothly.

The pickup supporting member 2 is moved in the radial direction of the disk while being guided by the guide shaft 1. As is clear from the sectional view shown in FIG. 6 and the guide shaft 1 do not come into contact with each other. Similarly, the mounting leg 7 of the pickup support member 2 does not contact the guide shaft 1. Accordingly, there is no contact between the metal and the metal, so that the sliding loss due to the contact can be reduced.

[0021]

According to the pickup driving apparatus of the present invention, the disk guide is guided in the radial direction by a cylindrical guide shaft, and the pickup supporting member is supported by a driving member moved by an electric motor. There is no contact between the pickup support member and the guide shaft. Therefore, according to the present invention, it is possible not only to eliminate the sliding loss due to the contact between the metals, but also to prevent the shaving occurring between the metals, thereby obtaining an inexpensive and long-life driving device. it can.

[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 a line AB in FIG.

FIG. 3 is a sectional view taken along line XY of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide shaft 2 Pickup support member 3 Pickup 4,5 Support hole 6,7 Mounting leg piece 8 Drive gear 10 Drive member 16,17 Cylindrical part

Claims (2)

(57) [Claims] A drive gear rotatably driven by an electric motor during a movement of the pickup; and a spur gear that is guided by a cylindrical guide shaft in a radial direction of the disk and meshes with the drive gear. A drive member made of a synthetic resin, and a pickup support member provided with mounting leg pieces in which a pickup is fixed and a support hole through which the guide shaft is inserted is formed, and the drive member is A pickup driving device comprising a cylindrical portion inserted into a support hole formed in a mounting leg piece of a pickup support member. 2. The pickup according to claim 1, further comprising biasing means for rotating the driving member with respect to the pickup supporting member and the guide shaft, and biasing the spur gear in a direction in which the spur gear meshes with the driving gear. Drive.