JP3075876B2 - Pickup feeder - 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 feeding 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 moving such a pickup, there is disclosed in Japanese Utility Model Laid-Open No. 2-20874 a technique for moving the pickup by rotating a shaft provided with a thread groove on the outer periphery.

[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.
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.

An object of the present invention is to provide a pickup feeding device that takes this point into consideration.

[0005]

The feeder according to the present invention has a pickup support member on which a disk is guided in a radial direction by a cylindrical guide shaft and a pickup is fixed, and a thread groove on the outer periphery. A pickup feed shaft, which is provided and driven to rotate by an electric motor, and is provided in parallel with the guide shaft, is screwed into a screw hole formed in the pickup support member, and has a conical tip. And a screw formed in a shape.

[0006]

According to the present invention, a screw is screwed into a screw hole formed in the pickup support member to transmit the rotational force of the pickup feed shaft to the pickup support member.

[0007]

FIG. 1 is a sectional view of a main part showing an embodiment of a feeder of the present invention, FIG. 2 is a cross-sectional view of a main part showing a relationship between a pickup feed shaft and a screw, and FIG. It is a top view of an important section showing the feeder.

In FIG. 1, reference numeral 1 denotes a cylindrical guide shaft which is fixedly mounted on a fixed substrate (not shown). Reference numeral 2 denotes a pickup support member to which a pickup 3 is fixed, one end of which is supported by the guide shaft 1. The disk is provided so as to be able to move in the radial direction of the disk.

Reference numeral 4 denotes a pickup feed shaft which is provided in parallel with the guide shaft 1 and supports the other end of the pickup support member 2.
And is configured to be rotationally driven in the forward and reverse directions by an electric motor (not shown) at the time of the feeding operation of the pickup 3.

Reference numeral 6 denotes a screw hole formed at a position corresponding to the pickup feed shaft 4 on the lower surface of the pickup support member 2, and 7 denotes a screw screwed into the screw hole 6.
The tip 7a is formed in a conical shape so as to engage with the thread groove 5 provided on the pickup feed shaft 4.

The feeder of the present invention is constructed as described above. In such a structure, after the pickup supporting member 2 is mounted so as to be supported by the guide shaft 1 and the pickup feed shaft 4, the screw 7 Screw hole 6
By screwing into this, the pickup feeding device can be assembled.

When a screw 7 is screwed into the screw hole 6, FIG.
As shown in FIG. 7, the tip 7a of the screw 7 is engaged with the thread groove 5 of the pickup feed shaft 4. In such a state, when the electric motor for pick-up feed rotates, the pick-up feed shaft 4 is rotated clockwise or counterclockwise in FIG. Pickup feed shaft 4
Is rotated, a driving force acts on the pickup support member 2 via the screw 7 engaged with the screw groove 5, so that
The pickup support member 2 is displaced in the axial direction of the guide shaft 1.

In this manner, the pickup supporting member 2 moves while being guided by the guide shaft 1 and the pickup feed shaft 4, so that the pickup supporting member 2
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.

One embodiment of the present invention is configured as described above. Next, another embodiment will be described with reference to FIGS. In the figure, the same members as those in the above-described embodiment are denoted by the same reference numerals.

In the drawing, reference numeral 8 denotes a pickup supporting member 2
The screw 8 is screwed into the screw hole 6 formed at the front end, and the tip 8a is flattened. 9 is a steel ball which is inserted into the screw hole 6 and engages with the screw groove 5 provided on the pickup feed shaft 4. 10 is inserted between the steel ball 9 and the tip 8 a of the screw 8. And has the function of pressing the steel ball 9 against the pickup feed shaft 4.

In such a configuration, the diameter of the screw hole 6 is larger than the diameter of the steel ball 9, but the diameter of the portion in which the steel ball 9 is inserted in the axial direction of the pickup feed shaft 4 is the same as that of the steel ball 9. 9 is configured to be substantially the same as the diameter. Also, screw holes 6
And the diameter of the steel ball 9 can be made substantially the same.

In the present invention thus constructed, the pickup support member 2 is mounted so as to be supported by the guide shaft 1 and the pickup feed shaft 4, and after the steel ball 9 and the coil spring 10 are inserted into the screw holes 6, By screwing the screw 8 into the screw hole 6, the pickup feeder can be assembled.

When a screw 8 is screwed into the screw hole 6, FIG.
As shown in FIG. 7, the steel ball 9 is engaged with the thread groove 5 of the pickup feed shaft 4. In this state, when the electric motor for pick-up feed rotates, the pick-up feed shaft 4 is rotated clockwise or counterclockwise in FIG. When the pick-up feed shaft 4 rotates, a driving force acts on the pick-up support member 2 via the steel ball 9 engaged with the thread groove 5, so that the pick-up support member 2 moves in the axial direction of the guide shaft 1. It is displaced. When such an operation is performed, the steel ball 9 is pressed against the pickup feed shaft 4 by the elastic force of the coil spring 10, so that the engagement state with the screw groove 5 can be maintained in a good state.

As described above, since the pickup support member 2 moves while being guided by the guide shaft 1 and the pickup feed shaft 4, the pickup support member 2 moves.
Is moved in the radial direction of the disk. Therefore, the signal recorded on the disk rotated and driven by the turntable is read by the pickup 3.

[0020]

According to the present invention, the disk is guided in a radial direction by a cylindrical guide shaft, and a screw is screwed into a screw hole formed in a pickup supporting member to which the pickup is fixed. By transmitting the rotational force of the pickup feed shaft to the pickup support member, the structure is very simple, the assembly work can be performed easily, and a great effect can be achieved for miniaturization of the disc player. To play.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a relationship between a pickup feed shaft and a screw.

FIG. 3 is a plan view of a main part showing a feeding device according to the present invention.

FIG. 4 is a sectional view of a main part showing another embodiment of the present invention.

FIG. 5 is a sectional view of a main part showing a relationship between a pickup feed shaft and a steel ball.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide shaft 2 Pickup support member 3 Pickup 4 Pickup feed shaft 5 Screw groove 6 Screw hole 7,8 Screw 9 Steel ball 10 Coil spring

Claims (2)

(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 thread groove is provided on an outer periphery, and the disk is rotationally driven by an electric motor. And a pickup feed shaft provided in parallel with the guide shaft, and a screw screwed into a screw hole formed in the pickup support member and having a tip portion formed in a conical shape, A pickup feed device wherein a tip end of a screw is engaged with a screw groove provided on the pickup feed shaft. 2. 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 screw groove provided on an outer periphery, and a rotation driven by an electric motor. A pickup feed shaft provided in parallel with the guide shaft, a screw screwed into a screw hole formed in the pickup support member, and the pickup feed shaft inserted into the screw hole. Pick-up feeder, comprising: a steel ball engaged with a screw groove provided on the steel ball; and a coil spring inserted between the steel ball and the screw and pressing the steel ball against the pick-up feed shaft. .