JP3349287B2 - 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 feeder for reading a signal recorded on a disk.

[0002]

2. Description of the Related Art Disk players which read signals recorded on a disk using an optical pickup have become widespread, and such a pickup is moved in the radial direction of the disk by the driving force of an electric motor. Is configured. Japanese Patent Application Laid-Open No. 2-72470 discloses a technique for moving such a pickup by rotating a shaft provided with a feed groove provided on the outer periphery, which is various.

[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 is complicated and assembly cannot be easily performed.

Further, in the feeder of the above-mentioned technique, since the driving force on the pickup support member on which the pickup is mounted 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 feeding device which solves such a problem.

[0007]

The feeder according to the present invention is provided with a pickup support member on which a disk is guided in a radial direction by a guide shaft and to which a pickup is fixed, and a feed dog provided on an outer periphery. And a driving gear that is rotationally driven by an electric motor, a feeding gear that is rotatably provided at a position separated from the driving gear and has a feed dog provided on the outer periphery, and the driving gear and the feeding gear. A drive belt that is stretched between and is formed with drive teeth that are in mesh with the feed dog; and a drive belt that is provided on the pickup support member and meshes with drive teeth of the drive belt. It is composed of a certain tooth for moving the pickup.

[0008]

According to the present invention, the pickup supporting member is moved in the radial direction of the disk by the drive belt moved by the rotation of the drive gear.

[0009]

FIG. 1 is a plan view of a main part showing a feeder of the present invention, FIG. 2 is a plan view of a main part showing a feeder of the present invention, FIG.
FIG. 4 is a side sectional view of a main part showing the feeder of the present invention, and FIG. 4 is a bottom view of a main part showing the feeder of the present invention.

In the drawings, reference numerals 1 and 2 denote guide shafts mounted and fixed on a fixed substrate (not shown). Reference numeral 3 denotes a pickup support member to which a pickup 4 is fixed. That is, the disk (not shown) is supported so as to be movable in the radial direction. 5 is a pickup drive motor (not shown)
Is transmitted through a gear (not shown) to rotate in the forward and reverse directions, 6 is a drive gear that rotates integrally with the transmission gear 5 and has a feed dog on the outer periphery, 7 Is a feed gear rotatably provided at a position separated from the drive gear 6 and provided with a feed dog on the outer periphery. A straight line connecting the drive gear 6 and the feed gear 7 is formed by the guide. It is positioned so as to be parallel to the shafts 1 and 2. Reference numeral 8 denotes a drive belt which is stretched between the drive gear 6 and the feed gear 7 and has drive teeth 8A which are in mesh with the feed teeth.

Reference numeral 9 denotes an arm portion provided on the pickup supporting member 3, and a pickup moving meshing tooth 10 meshed with a driving tooth 8 A formed on the driving belt 8 is formed. Numeral 11 denotes a leaf spring fixed to the pickup supporting member 3 by screws 12, and its end 11A abuts one surface of the drive belt 8 to move the drive belt 8 in the direction of the pickup moving meshing tooth 10. It is configured to be pressed and biased.

The feeder of the present invention is configured as described above. In such a configuration, when the electric motor for driving the pickup rotates, the rotational force is transmitted to the drive gear 6 via the transmission gear 5. Therefore, the drive gear 6 is rotated in the forward and reverse directions. When the drive gear 6 is rotated, a drive belt 8 on which a drive tooth 8A meshed with a feed dog formed on the drive gear 6 is formed.
Is moved between the feed gear 7.

When the drive belt 8 moves, the drive teeth 8A formed on the drive belt 8 and the meshing teeth 10 for moving the pickup are in mesh with each other. It is transmitted to the pickup support member 3 via the gear 8A and the intermeshing teeth 10 for pickup movement. As a result, the pickup support member 3
Is displaced in the moving direction of the drive belt 8 corresponding to the rotation direction of the electric motor for driving the pickup.

Since the pickup supporting member 3 moves while being guided by the guide shafts 1 and 2 by the above-described operation, the pickup 4 fixed to the pickup supporting member 3 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 4.

As described above, the feeding operation of the pickup 4 according to the present invention is performed. When such an operation is performed, the end 11A of the leaf spring 11 contacts one surface of the driving belt 8, and the driving belt 8 is moved. Since the urging force is urged in the direction of the pickup moving meshing tooth 10, the meshing state between the pickup moving meshing tooth 10 and the driving tooth 8 </ b> A formed on the drive belt 8 can be favorably maintained. Accordingly, the feed operation of the pickup supporting member 3 by the rotation driving operation of the pickup driving motor can be smoothly performed.

Further, since the end 11A of the leaf spring 11 abuts against one surface of the drive belt 8, the drive belt 8 is pressed and urged in the direction of the engagement teeth 10 for pick-up movement.
In a state where the pickup supporting member 3 is in contact with a stopper provided on the fixed substrate and further displacement is prevented, the movement of the drive belt 8 by the rotational driving operation of the pickup driving motor is performed. The reciprocating operation of the end 11A of the leaf spring 11 releases the meshing state between the engagement teeth 10 for pick-up movement and the driving teeth 8A formed on the driving belt 8, that is, the elastic force of the leaf spring 8 is driven. Since it operates as a force limiter, no problem occurs.

In this embodiment, the straight line connecting the drive gear 6 and the feed gear 7 is made parallel to the guide shafts 1 and 2. However, the number of feed gears may be plural. If a part of the drive belt stretched between the drive gear 6 and the plurality of feed gears is configured to be parallel to the guide shafts 1 and 2, the feed operation of the pickup is not hindered. You can do it.

[0018]

According to the present invention, not only the feed operation of the pickup supporting member to which the pickup is fixed is performed by the drive belt moved by the rotation of the drive gear, but also the drive belt is meshed with the pickup belt by the leaf spring. Because it is configured to urge in the direction of the teeth,
The meshing state between the drive teeth formed on the drive belt and the pickup moving meshing teeth can be favorably maintained. Further, according to the present invention, when the movement operation of the pickup support member is blocked and the movement operation by the drive belt is performed, the plate spring operates as a limiter for a driving force of the drive belt with respect to the pickup support member. This has the advantage that the feed mechanism can be prevented from being damaged.

[0019]

[0020]

[0021]

[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 plan view of a main part showing a feeding device of the present invention.

FIG. 3 is a side sectional view of a main part showing a feeding device of the present invention.

FIG. 4 is a bottom view of a main part showing the feeding device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 2 Guide shaft 3 Pickup support member 4 Pickup 6 Drive gear 7 Feeding gear 8 Drive belt 8A Drive tooth 10 Pickup meshing tooth 11 Leaf spring

Claims (1)

(57) [Claims] 1. A pickup support member to which a disk is guided in a radial direction by a guide shaft and to which a pickup is fixed, and a drive gear provided with a feed dog on the outer periphery and rotated by an electric motor. A feed gear rotatably provided at a position separated from the drive gear and provided with a feed dog on the outer periphery; and the feed gear stretched between the drive gear and the feed gear. A drive belt formed with drive teeth meshing with teeth, a pickup moving mesh tooth provided on the pickup support member and meshed with the drive teeth of the drive belt; and the pickup support. When it is fixed to the member
The end of the drive belt is used to move the pickup belt.
It consists of a leaf spring that urges in the direction that meshes with the meshing teeth,
The movement of the drive belt by the rotation of the drive gear
Therefore, the pickup support member is moved in the radial direction of the disc.
Moving the pickup support member
When the operation is stopped, the leaf spring is
As a limiter for driving force to the up support member
A pickup feeding device characterized by being operated .