JPH09297974A - Pickup feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the performance of a disk player to be rotated at a high speed by disposing a pickup driving motor in the outside of the diameter direction of a disk mounted on a turntable. SOLUTION: When a pickup driving motor 19 is rotated, a driving bevel gear 20 fixed to its rotary shaft is rotary-driven. After the gear 20 is rotated, its rotation is transmitted to a bevel gear 18 engaged with the gear 20 and the gear 18 is rotary-driven. After the gear 18 is rotated, a bevel gear 17 integrally formed with the gear 18 is rotary-driven. After the gear 17 is rotated, a gear 12 engaged with the gear 17 is rotary-driven, and a pickup feed shaft 8 attached and fixed to the gear 17 is rotary-driven. Thus, the rotating force of the shaft 8 is applied as a displacing force to a pickup supporting member 13, and then the member 13 is guided by a guide shaft 6 and displaced. Therefore, by the displacing action of the member 13, an optical pickup 14 is moved and displaced to a desired position.

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 disc.

[0002]

2. Description of the Related Art Disc players that use an optical pickup to read a signal recorded on a disc have come into widespread use. Such a pickup is designed to be moved in the radial direction of the disc by the driving force of an electric motor. Is configured. There are various devices for moving such a pickup, but a technique for rotating the pickup by rotating a shaft having a feed groove on its 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. 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, and a CD-ROM player incorporated and used in a personal computer is required to be lightweight and compact, and particularly thin.

FIG. 4 is a front view showing an arrangement relationship of main parts in a conventional disc play, in which a centering portion 1 for placing a disc D and engaging with a central hole formed in the disc D is provided. A turntable 2 provided, a disc driving electric motor 3 for rotationally driving the turntable 2, an optical pickup 4 for reading a signal recorded on the disc D, and a diameter of the disc D for the optical pickup 4. It is composed of a pickup driving electric motor 5 which is moved in the direction.

As a result of miniaturization of the disc player having such a structure, the pickup driving electric motor 5 is arranged inside the diameter of the disc D, that is, below the disc D. As the disc player becomes thinner, the axial height of the disc driving electric motor 3 decreases, and accordingly, the length of the pickup driving electric motor 5 in the direction perpendicular to the rotation axis, that is, the height must be reduced. It is in a state of not getting. Therefore, the torque of the electric motor used as the pickup driving electric motor 5 becomes small, and there is a problem in that the high-speed reproduction operation that is performed in the CD-ROM player cannot be performed.

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

[0007]

According to the present invention, there is provided a feed device according to the present invention, wherein a feed groove is provided on the outer periphery of the feed device, and a pickup feed shaft rotatably driven by a pickup drive motor and a guide shaft guide the disc in the radial direction of the disc. A pickup support member, which is guided by the movement and is moved in the radial direction of the disc by the rotation driving operation of the pickup feeding shaft, and to which a pickup for fixing a signal for reading a signal recorded on the disc is fixed, And a disk drive electric motor that rotationally drives a turntable on which is mounted.

[0008]

1 is a plan view of a main portion of a feeder according to the present invention, FIG. 2 is a front view showing a layout of main parts in the feeder according to the present invention, and FIG. It is a top view which shows the arrangement relation of the disc player.

In the figure, 6 is a guide shaft fixedly mounted on a fixed base plate 7, 8 is rotatably supported by supporting parts 9 and 10 formed on the fixed base plate 7, and the guide shaft 6 is fixed to the guide shaft 6. Pickup feed shafts provided in parallel with feed groove 11 on the outer periphery.
And the gear 12 is attached and fixed to the end.

Reference numeral 13 denotes a pickup support member to which the optical pickup 14 is fixed and which is supported by the guide shaft 6 so as to be displaced in the directions of arrows A and B, that is, in the radial direction of the disc. It is constructed so that it can be displaced in the radial direction by the rotational movement of the working shaft 8. A well-known technique may be used for the driving mechanism of the pickup supporting member 13 by the pickup feeding shaft 8 and description thereof will be omitted.

A transmission gear 15 is rotatably attached to a rotation support shaft 16 provided on the fixed base plate 7, and is in a state of meshing with a gear 12 fixedly attached to the pickup feed shaft 8. A spur gear 17 is formed, and a bevel gear 18 having a diameter larger than that of the spur gear 17 is formed. Reference numeral 19 denotes a pickup driving electric motor that is rotatably driven when the pickup moves, and is mounted and fixed on the fixed substrate 7 so that the rotation axis is orthogonal to the rotation support shaft 16 that is the rotation axis of the transmission gear 15. ing. Reference numeral 20 denotes a drive bevel gear fixed to the end of the rotary shaft of the pickup driving electric motor 19, and meshes with the bevel gear 18 and the bevel gear 18
The function of transmitting rotation to.

Reference numeral 21 is a turntable on which the disk D is placed, and a centering portion 22 which engages with a central hole formed in the disk D is formed in the center of the turntable. Reference numeral 23 denotes a disk drive electric motor mounted and fixed to the fixed substrate 7, and the turntable 21 is press-fitted and fixed to the rotary shaft.

In such a configuration, the pickup driving electric motor 19 is arranged outside the disk D placed on the turntable 21 in the radial direction. That is, the pickup driving electric motor 19 is used for the disk D
It is never placed below the signal plane of.

As described above, the pickup feeding device of the present invention is configured, and in such a configuration,
When the pickup driving electric motor 19 rotates, the driving bevel gear 20 fixed to the rotation shaft thereof is rotationally driven. When the drive bevel gear 20 rotates, the rotation is transmitted to the bevel gear 18 in a state of meshing with the drive bevel gear 20, and the bevel gear 18 is rotationally driven. When the bevel gear 18 rotates, the spur gear 17 integrally formed with the bevel gear 18 is rotationally driven.

When the spur gear 17 rotates, the spur gear 17
The gear 12 in a state of meshing with is rotationally driven, and the pickup feeding shaft 8 to which the gear 12 is attached and fixed is rotationally driven. As a result, the rotational force of the pickup feed shaft 8 causes the pickup support member 13 to rotate.
The pickup support member 13 is displaced while being guided by the guide shaft 6 because it acts as a displacing force. Therefore, the optical pickup 14 can be moved and displaced to a desired position by the displacement operation of the pickup support member 13.

As described above, the moving operation of the optical pickup 14 by the pickup driving electric motor 19 is performed. Next, the assembling operation will be described. The rotation support shaft 16 is fixedly mounted on the fixed substrate 7, the transmission gear 15 is inserted into the rotation support shaft 16, and then the pickup driving electric motor 19 is inserted.
The pickup driving electric motor 19 is fixed to the fixed substrate 7 with screws or the like while the driving bevel gear 20 fixed to the rotating shaft of the above is meshed with the bevel gear 18 formed on the transmission gear 15. The pickup support member 13 is displaceably supported by the guide shaft 6.
A pickup feeding shaft 8 for moving the
It is possible to assemble the feeding device of the present invention by inserting the gear 12 which is inserted into the shaft 0 for pick-up and is meshed with the spur gear 17 formed on the transmission gear 15 while being fixed to the pickup feed shaft 8.

As described above, the assembling operation of the feed device of the pickup of the present invention is carried out. As shown in FIG. 1, the driving bevel gear 20 is engaged with the bevel gear 18 to engage the umbrella. The displacement of the transmission gear 15 in which the toothed gear 18 is formed is restricted in the axial direction, that is, in the direction of arrow A. Therefore, the transmission gear 15 is in a state of being inserted and held in the rotation support shaft 16, and it is not necessary to provide a retaining member such as a washer.

Further, according to the present invention, the pickup driving electric motor 19 is placed on the turntable 21 and the disk D is mounted thereon.
Since it is arranged on the outer side in the radial direction, the length in the direction perpendicular to the rotation axis of the pickup driving electric motor 19, that is, the height can be made higher than the upper surface of the disk D, as shown in FIG. Therefore, the pickup driving electric motor 1
An electric motor having a large torque can be used as the electric motor used as 9, and the performance of a disc player, such as a CD-ROM player, which requires high-speed rotation, can be improved. The height of the pickup driving electric motor 19 is set higher than the upper surface of the disk D.
The same effect can be obtained by making it higher than the disk mounting surface of No. 1.

FIG. 3 shows an arrangement relationship of a disc player in which the feeding device of the present invention is incorporated, and the disc player has a rectangular shape. In such a rectangular disc player, the turntable 21 is arranged substantially at the center and the pickup driving electric motor 19 is arranged at the corner as shown. The shape of the disc player can be minimized by arranging the pickup driving motor 19 at the corner of the rectangular disc player.

[0020]

According to the present invention, the pickup driving electric motor for displacing the pickup in the radial direction of the disk is arranged outside the disk mounted on the turntable in the radial direction. Since there is no restriction in the length in the direction perpendicular to the rotation axis, that is, in the height direction, it is possible to use an electric motor having a large torque as the pickup driving electric motor. Therefore, according to the present invention, a CD-ROM player can be used. Thus, it is possible to improve the performance of a disc player that requires high-speed rotation.

Further, according to the present invention, the pickup driving electric motor is arranged between the extended line of the guide shaft for guiding the radial movement of the pickup supporting member in the radial direction of the disc and the pickup feeding shaft for moving the pickup. It is possible to prevent the feeder from increasing in size. And the present invention
Since the direction of the rotation axis of the pickup driving electric motor is set to be perpendicular to the pickup feeding shaft, the pickup driving electric motor can be arranged at the position closest to the turntable side. It has a great effect on miniaturization.

Further, according to the present invention, since the height of the pickup driving motor is set higher than the disc surface, the space in the height direction of the disc player can be utilized to the maximum extent, and therefore the pickup driving motor can be used. An electric motor that can obtain a large torque can be used as the electric motor.

Further, according to the present invention, in the rectangular disc player, since the pickup driving motor is arranged at the corner, the space in the rectangular disc player can be effectively utilized. The effect of reducing the size of the disc player is extremely large.

[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 front view showing an arrangement relationship of main parts in the feeding device of the present invention.

FIG. 3 is a plan view showing a positional relationship of a disc player in which the feeding device of the present invention is incorporated.

FIG. 4 is a front view showing an arrangement relationship of main components in a conventional disc breaker.

[Explanation of symbols]

 6 Guide Shaft 7 Fixed Substrate 8 Pickup Feeding Shaft 12 Gear 13 Pickup Support Member 14 Optical Pickup 15 Transmission Gear 17 Spur Gear 18 Bevel Gear 19 Pickup Drive Motor 20 Drive Bevel Gear 21 Turntable 23 Disk Drive Motor D disk

Claims (5)

[Claims] 1. A pickup feed shaft which is provided with a feed groove on its outer periphery and is rotationally driven by a pickup drive electric motor; and a guide shaft which guides the radial movement of the disc and the pickup feed shaft. Is rotated in the radial direction of the disc, and a pickup support member to which a pickup for reading a signal recorded on the disc is fixed and a turntable on which the disc is placed are rotationally driven. A pickup feeding device comprising a disc driving electric motor, wherein the pickup driving electric motor is arranged outside the disc mounted on the turntable in a radial direction. 2. The pickup feeding device according to claim 1, wherein the height of the pickup driving motor is higher than that of the surface of the disk portion. 3. The pickup feeding device according to claim 1, wherein a pickup driving electric motor is arranged between a line extending from the pickup feeding shaft and the guide shaft. 4. The pickup feeding device according to claim 3, wherein the direction of the rotation axis of the pickup driving motor is perpendicular to the pickup feeding axis. 5. The pickup feeding device according to claim 3, wherein a pickup driving electric motor is arranged at a corner of the disk player having a rectangular shape.