JPH06309814A - Feeding device for pickup - Google Patents

Abstract

PURPOSE:To obtain the feeding device whose structure is simple and which can be assembled easily by engaging an engagement part of a contact-type coil spring which is fitted to, and mounted on, a shaft for pickup feed with a threaded groove which has been made in the shaft and transmitting the turning force of the shaft to a pickup support member. CONSTITUTION:A pickup feed device is constituted of a guide shaft 1 which has been attached and fixed to a fixation board not indicated in the figure, a support member 2 which fixes a pickup 3 and on which one pair of support parts 4, 5 are formed and an end part 6 which is formed on the opposite side of the support parts 4, 5. The device can be moved in the shaft direction, i.e., in the radial direction of a disk by the guide shaft 1. The device is constituted in this manner, a contact-type coil spring 11 is arranged between the support parts 4, 5, and a shaft 7 for pickup feed is then inserted into, and passed through, shaft holes 8, 9 made in the support parts 4, 5 and a winding hole 11a for a spring 11. The shaft 7 is inserted into the hole 11a while it is turned, and an engagement part 12 which has been formed at the spring 11 is engaged with a threaded groove 10 which has been formed in the shaft 7.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Optical disc players have come into widespread use in which signals recorded on a disc are read using an optical pickup. Such a pickup is moved in the radial direction of the disc by a driving force of an electric motor. Is configured. There are various devices for moving such a pickup, but a technique in which the pickup is moved by rotating a shaft provided with a thread groove on the outer periphery is described in Japanese Utility Model Laid-Open No. 72470/1990.

[0003]

As a typical optical disc player, a CD player is well known, and some of the CD players are configured to listen to a reproduced sound by headphones. There is a headphone stereo type portable CD player.
Since such a portable CD player is used while being carried, it is required to be small and particularly thin, and it is necessary to consider the influence of vibration.

In the above-mentioned publication, a torsion coil is used as a means for holding an engagement member engaging with a thread groove provided on the outer periphery of a shaft which is rotationally driven by an electric motor and the thread groove. A technique using a spring is described,
Since such a configuration has a large number of parts, there is a problem that the configuration becomes complicated and the assembly cannot be easily performed.

The present invention is intended to provide a pickup feeding device that solves the above problems.

[0006]

A feeder according to the present invention comprises a pickup support member in which a guide shaft guides a radial movement of a disc, a pickup is fixed, and a pair of support portions are formed. A pickup feed shaft which is provided with a thread groove on the outer periphery and is driven to rotate by an electric motor and which is inserted into a shaft hole formed in the pair of support portions; and a pickup feed shaft fitted to the pickup feed shaft. And a contact type coil spring which is disposed between the pair of supporting portions and has an engaging portion formed at an end portion to be engaged with a screw groove provided in the pickup feeding shaft. There is.

[0007]

According to the present invention, the pickup feeding shaft is rotated by engaging the engaging portion of the close contact type coil spring fitted on the pickup feeding shaft with the thread groove provided on the pickup feeding shaft. The force is transmitted to the pickup support member.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view of an essential part showing a feeder of the present invention, FIG. 2 is a side sectional view of an essential part showing a feeder of the present invention, and FIG. It is a front view.

In the figure, 1 is a guide shaft fixedly mounted on a fixed substrate (not shown), and 2 is a pickup supporting member on which a pickup 3 is fixed and a pair of supporting portions 4 and 5 are formed. The guide shaft 1 supports the end portion 6 opposite to the support portions 4 and 5 so as to be movable in the axial direction, that is, in the radial direction of a disc (not shown).

Numeral 7 is provided in parallel with the guide shaft 1 and is inserted into shaft holes 8 and 9 formed in the supporting portions 4 and 5 of the pickup supporting member 2 to support the pickup supporting member 2. The pickup feed shaft is provided with a thread groove 10 on the outer periphery and is configured to be rotationally driven in the forward and reverse directions by a pickup feed motor (not shown) during the feed operation of the pickup 3.

Reference numeral 11 denotes a close contact type coil spring which is fitted on the pickup feed shaft 7 and arranged between the support portion 4 and the support portion 5 formed on the pickup support member 2 and is shown in the drawing. Thus, the support portion 4 and the support portion 5 are arranged without a gap. An engaging portion 12 bent as shown in FIG. 3 is formed at the end of the contact type coil spring 11, and the engaging portion 12 is attached to the pickup feed shaft 7 as shown in FIG. It is configured to engage with the thread groove 10 provided. Reference numeral 13 denotes a detent engagement portion that is formed at the other end of the contact coil spring 11 and that engages with a recess 14 formed in the pickup support member 2. It has a function to prevent the rotation of.

The feeding device of the present invention is constructed as described above. In such a construction, after the close contact type coil spring 11 is arranged between the supporting portions 4 and 5 formed on the pickup supporting member 2, The pickup feed shaft 7 is inserted through the shaft holes 8 and 9 formed in the support portions 4 and 5 and the winding hole 11a of the close contact type coil spring 11. Then, the shaft holes 8 and 9 of the pickup feed shaft 7
The insertion operation of the contact type coil spring 11 into the winding hole 11a is performed by rotating the pickup feed shaft 7. When such an operation is performed, the engagement portion 12 formed on the close contact type coil spring 11 is brought into a state of being engaged with the thread groove 10 formed on the pickup feed shaft 7. Further, if the guide shaft 1 is inserted into the other end of the pickup supporting member 2 and fixed to the fixed substrate, the pickup feeding device can be assembled.

In this way, the feeding device according to the present invention is
Although assembled, in this state, as shown in FIG. 2, the engagement portion 12 of the close contact type coil spring 11 is engaged with the thread groove 10 formed on the pickup feed shaft 7. In such a state, when the pickup feeding electric motor is rotated, the pickup feeding shaft 7 is rotated in the forward and reverse directions. When the pickup feed shaft 7 rotates, a force that displaces the pickup feed shaft 7 in the axial direction acts on the engaging portion 12 that is engaged with the thread groove 10. The formed contact coil spring 11 is displaced in the axial direction.

When the contact type coil spring 11 is displaced in the axial direction, both ends of the contact type coil spring 11 are in contact with the supporting portions 4 and 5 formed on the pickup supporting member 2, so that The pickup support member 2 is displaced in the axial direction of the guide shaft 1.

By the above-mentioned operation, the pickup support member 2 moves while being guided by the guide shaft 1 and the pickup feed shaft 7, so that the pickup 3 fixed to the pickup support member 2 is moved in the radial direction of the disc. . Therefore, the signal recorded on the disk which is rotationally driven by the turntable (not shown) is read by the pickup 3.

[0016]

According to the present invention, the engaging portion formed on the close contact type coil spring fitted to the pickup feed shaft is engaged with the thread groove provided on the pickup feed shaft. Since the rotational force of the pickup feed shaft is transmitted to the pickup support member, the structure is very simple, and as a result, the assembling work can be performed easily and the disc player can be downsized. It has a great effect.

[Brief description of drawings]

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

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

FIG. 3 is a front view of a close contact type coil spring which constitutes the present invention.

[Explanation of symbols]

 1 Guide Shaft 2 Pickup Supporting Member 3 Pickup 4, 5 Supporting Part 7 Pickup Feeding Shaft 10 Screw Groove 11 Contact Coil Spring 12 Engaging Part

Claims (1)

[Claims] 1. A pickup support member, which guides the radial movement of the disc by a guide shaft, fixes the pickup, and has a pair of support portions, and a thread groove on the outer periphery. A pickup feed shaft that is driven to rotate by an electric motor and is inserted into shaft holes provided in a pair of support portions formed in the pickup support member; and a pickup feed shaft that is fitted on the pickup feed shaft. A pickup feeding device comprising a close contact type coil spring which is disposed between a pair of support portions and has an engaging portion formed at an end portion to be engaged with a screw groove provided on the pickup feeding shaft.