JP3281710B2 - 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, but such a pickup is moved by a driving force of an electric motor in a radial direction of the disk. It is configured as follows. As a device for moving such a pickup, there is disclosed in Japanese Utility Model Laid-Open Publication No. 2-72470, a technique for moving the pickup by rotating a shaft having variously provided feed grooves on its 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.

The above-mentioned publication discloses a torsion coil as a means for maintaining an engagement state between an engaging member provided on an outer periphery of a shaft rotatably driven by an electric motor and a feed groove and the feed groove. Although technology using a spring is described,
In such a configuration, since the number of parts is large, there is a problem that the configuration becomes complicated and assembly cannot be easily performed.

Further, in the feeder having such a configuration, since the driving force on the pickup supporting member to which the pickup is attached does not act in parallel with the moving direction of the pickup, the feed operation of the pickup cannot be performed accurately. There is a problem.

An object of the present invention is to provide a pickup feeder which solves the above-mentioned problem.

[0007]

In the feeder of the present invention, the radial movement of the disk is guided by the guide shaft, the pickup is fixed, and the first and second support portions are formed. A pickup support member,
A pickup feed shaft provided with a feed groove on the outer periphery, rotated by an electric motor, and inserted into shaft holes provided in first and second support portions formed in the pickup support member; A shaft hole through which the pickup feed shaft is inserted, and first and second arm portions which are in contact with an outer surface of the first support portion and an outer surface of the second support portion, are formed; And a driving member.

[0008]

According to the present invention, an engaging projection is provided on a driving member provided to move together with a pickup supporting member to which a pickup is fixed, and the engaging member engages with a feed groove provided on the outer periphery of a pickup feeding shaft. The pick-up feed operation is performed by the displacement force received by the engaging projection.

[0009]

FIG. 1 is a plan view of a main part showing a feeder of the present invention, and FIG. 2 is a side sectional view of a main part showing a feeder of the present invention.

In FIG. 1, reference numeral 1 denotes a guide shaft fixed to a fixed substrate (not shown), and 2 denotes a fixed pickup 3 and a first support 4 and a second support 5 formed thereon. An end portion 6 which is a pickup support member and is opposite to the first support portion 4 and the second support portion 5 can be moved by the guide shaft 1 in an axial direction, that is, in a radial direction of a disk (not shown). It is supported by. The pickup support member 2 is integrally formed of metal.

Reference numeral 7 denotes shaft holes 8 and 9 provided in parallel with the guide shaft 1 and formed in the first support portion 4 and the second support portion 5 of the pickup support member 2.
Is a pickup feed shaft that is inserted into the pickup support member 2 and supports the pickup support member 2. The pickup feed shaft is provided with a feed groove 10 on the outer periphery, and is driven in the forward and reverse directions by a pickup feed motor (not shown) during the feed operation of the pickup 3. It is configured to be driven to rotate.

A driving member 11 is made of a synthetic resin.
Shaft holes 12 and 13 through which the pickup feed shaft 7 is inserted are respectively provided, and the first arm portion 14 and the first arm portion 14 which are in contact with the outer surface 4A of the first support portion 4 and the outer surface 5A of the second support portion 5 are provided. Two arms 15 are formed.

Numeral 16 denotes an engaging projection formed integrally with the driving member 11 so as to engage with a feed groove 10 provided in the pickup feeding shaft 7 as shown in FIG. Is configured. Reference numerals 17 and 18 denote first and second rotation stopping projections formed integrally with the driving member 11 so as to abut against the lower surface 4B of the first support portion 4.
Reference numerals 9 and 20 denote third and fourth rotation stopping projections formed integrally with the driving member 11 so as to abut on the lower surface 5B of the second support portion 5.

In such a configuration, the driving member 11 is arranged such that the engaging projection 16 which engages with the feed groove 10 formed on the pickup feed shaft 7 elastically contacts the feed groove 10. It is molded into.

The feeder of the present invention is configured as described above. In such a configuration, when the electric motor for pick-up feed rotates, the pick-up feed shaft 7 is rotated in the forward and reverse directions. When the pick-up feed shaft 7 rotates, the engagement protrusion 16 is engaged with the feed groove 10.
Therefore, a force for displacing the pickup feed shaft 7 in the axial direction acts on the drive member 11, and the driving member 11 on which the engaging protrusion 16 is formed is displaced in the axial direction.

When the driving member 11 is in the axial direction,
When displaced in the direction, the first arm 14 formed on the driving member 11 presses the outer surface 4A of the first supporting portion 4 formed on the pickup supporting member 2, so that the pickup supporting member 2 is moved by an arrow. It is displaced in the A direction.
On the other hand, when the driving member 11 is displaced in the direction of arrow B, the second arm 15 formed on the driving member 11 presses the outer surface 5A of the second supporting portion 5 formed on the pickup supporting member 2. The pickup support member 2 is displaced in the direction of arrow B.

Since the pickup supporting member 2 moves while being guided by the guide shaft 1 and the pickup feeding shaft 7 by the above-described operation, the pickup 3 fixed to the pickup supporting member 2 is moved in the radial direction of the disk. . Therefore, a signal recorded on a disk driven to rotate by a turntable (not shown) is read by the pickup 3.

When the engaging projection 16 which engages with the feed groove 10 provided on the pickup feed shaft 7 is formed at an intermediate position between the first arm 14 and the second arm 15, the first arm 14 And the force applied to the second arm 15 are the same, so that the feed operation of the pickup supporting member 2 can be performed in a balanced manner in the inner circumferential direction and the outer circumferential direction.

Further, the engaging projection 16 is connected to the first arm 14 and the second arm 14.
When the engaging protrusion 16 is formed at an intermediate position between the arm 15 and the elastic force of the driving member 11 to urge the engaging protrusion 16 into contact with the feed groove 10, the engagement between the engaging protrusion 16 and the feed groove 10 is reduced. Since the combined state can be maintained satisfactorily, the feeding operation of the pickup supporting member 2 can be performed smoothly.

[0020]

According to the feeder of the present invention, a drive member provided to move together with a pickup support member to which a pickup is fixed is engaged with a feed groove provided on the outer periphery of a pickup feed shaft. A notch is provided to not only perform the feed operation of the pickup by the displacement force received from the feed groove by the engaging protrusion, but also to displace the engaging protrusion to the pickup support member. Since it is provided at an intermediate position between the first arm and the second arm,
The driving force acting on the first arm and the second arm is the same, and as a result, the feed operation of the pickup support member can be performed in a well-balanced manner in the inner and outer circumferential directions of the disk. The present invention has.

Further, the displacement force of the driving member is transmitted to the pickup supporting member by contact between the supporting portion formed on the pickup supporting member and the supporting arm.
No reaction force from the pickup feed shaft is applied to the pickup support member. As a result, it is possible to reduce the shaving of the shaft hole formed in the support portion of the pickup support member, so that the present invention has a very great effect in extending the life of the feeder and reducing the deterioration of jitter. It is.

According to the present invention, since the rotation stopping projection is formed on the surface of the driving member opposite to the lower surface of the first support portion and the lower surface of the second support portion, the rotation stopping operation of the driving member can be performed in a well-balanced and accurate manner. Can be performed.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view of a main part showing a feeding device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide shaft 2 Pickup support member 3 Pickup 4 1st support part 5 2nd support part 7 Pickup feed shaft 10 Feed groove 11 Drive member 14 1st arm part 15 2nd arm part 16 Engagement protrusion 17 1st rotation stop Projection 18 Second rotation stop projection 19 Third rotation stop projection 20 Fourth rotation stop projection

Claims (3)

(57) [Claims] 1. A pickup support member in which a guide shaft guides the movement of a disk in a radial direction, a pickup is fixed, and first and second support portions are formed, and a feed groove is provided on an outer periphery. A pick-up feed shaft, which is rotatably driven by an electric motor and is inserted into shaft holes provided in first and second support portions formed in the pick-up support member; And a drive member made of a synthetic resin having a shaft hole through which the first and second arms are formed, the first and second arms being in contact with the outer surface of the first support portion and the outer surface of the second support portion. And the driving member
An engaging projection that engages with the feed groove of the pickup feed shaft is integrated with a provided intermediate position between the first arm and the second arm.
A pickup feeder characterized by being molded . 2. The front member is driven by an elastic force of the driving member.
The engagement protrusion is biased against the feed groove.
The feeding device according to claim 1, wherein: 3. The lower surface of said first support portion of said drive member and
And anti-rotation projections formed on the surface facing the lower surface of the second support part
The feeding device according to claim 1, wherein