JPH09265745A - Optical pickup feeder for reading optical information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an excessive torque from acting on a rack and pinion for feeding an optical pickup. SOLUTION: A torque transmission clutch A is formed by a friction force generated by abutting an end plane of a feeding gear 10 on a surface of a disk 13 formed on an end plane of a pinion 11 engaged with a rack and pressurizing the gear with a spring 17. Thus, an excessive torque exceeding the friction force makes the clutch A slip and this controls the transmission of the torque within a prescribed range.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a CD player,
The present invention relates to an optical pickup feeding device for MD players, LD players and the like.

[0002]

7 to 9 show a conventional optical pickup feeding device, and FIG. 7 is a block diagram of the most general optical pickup feeding device. Before starting the discussion, the operation of this device will be described with reference to FIG. The optical pickup feeding device of FIG. 7 is configured integrally with a rigid rack 52, and also has an innermost peripheral stopper 53 and an outermost peripheral stopper 5.
The pinion 61 meshing with the rack 52 rotates on the guide shaft 55 pivotally supported by the shaft 4 to be slid and fed out.

The power for sliding the optical pickup 51 is driven by a feed motor 56, which is a motor gear 57, a feed gear 58, a pinion 59 fixed coaxially with the feed gear 58, a feed gear 60, and a feed gear 6.
Rack 52 through a pinion 61 fixed coaxially with 0
Are sequentially transmitted to.

The optical pickup 51 of this structure receives the reflected light from the disk while moving in the radial direction of the disk when the disk (not shown) is actually operated and the optical pickup 51 itself by the signal. The present position is determined and the time until the optical pickup 51 moves to the inner peripheral edge of the disc is calculated.

When the disc is not set, it is judged that the disc is not set because there is no light reflected from the disc. At this time, the optical pickup 51 searches for the reflected light from the outer circumference to the inner circumference of the disc. Try to move towards. When the optical pickup 51 reaches the inner circumference, part of the optical pickup 51 has a stopper 53.
It will not be able to move further to the inner peripheral side by abutting against. At this time, the rotation of the feed motor 56 is continued until a time (predetermined time) from the outer circumference side to the inner circumference side of the optical pickup 51 by the control means by software elapses, and when the time elapses, the rotation is automatically performed. It is supposed to be stopped.

The operation of the feeding device of the optical pickup is as described above, but the device having the configuration shown in FIG.
Since the 2 and the pinion 61 mesh with each other, the rack 52
The pinion 61 is configured so that it cannot be disengaged even if excessive torque is applied.

Further, in the case of FIG. 8, an elastic portion 62 is formed inside the main body of the rack 63, and the elastic portion 62 enables the rack 63 to elastically mesh with the pinion 61. . Therefore, when an excessive torque is applied to the rack 63 and the pinion 61, the teeth of the rack 63 are retracted through the elastic portions 62 to disengage from each other and absorb the impact of the tooth surface.

In the case of FIG. 9, the structure of the rack 52 is a rigid body as in the case of FIG. 1, but the feed gear 60 and the pinion 61 fixed coaxially with the feed gear 60 are centered on the axis of the feed gear 58. The rotation lever 64 is provided for rotation, and the rotation lever 64 is pressed toward the rack 52 side via the spring 65, whereby the pinion 6 is attached to the rack 52.
1 is configured to mesh with each other. Therefore, in the device having this configuration, when excessive torque is applied to the rack 52 and the pinion 61, the rotating lever 64 can rotate in the direction in which the meshing is disengaged against the elastic force of the spring 65. Similar to the above, the mesh is disengaged to absorb the impact on the tooth surface.

[0009]

However, in the above-mentioned conventional apparatus, the system of FIG. 7 has a structure in which the pinion 61 and the rack 52 cannot be disengaged from each other.
Rack 5 when the player receives a strong impact such as a drop
The excessive torque acts on the pinion 2 and the pinion 61, causing damage such as chipping of the tooth tip. Further, since the feed motor 56 is kept in the locked state until the power is cut off, the rotation continues, so that a large current is consumed during this period and
There is a problem that the life of the feed motor 56 is shortened.

Further, in the method of FIGS. 8 and 9, the optical pickup 51 is moved to the innermost circumference and abuts on the stopper 52 by turning on the power when the disc is not set. In this case, the optical pickup 51 is forcibly stopped at that position, and excessive torque acts on the rack 52 and the pinion 61 to disengage them. However, since the pinion 61 continues to rotate until the power is cut off by the control means of the software, the pinion 61 idles in the disengaged state, and the teeth hit each other to generate a clicking sound. To do. This causes a problem that the commercial value is impaired.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide an optical pickup feeding device in which an excessive torque does not act on a rack and a pinion for feeding the optical pickup.

[0012]

To achieve the above object, the present invention is an optical pickup feeding device for reading optical information by sending an optical pickup by a pinion and a rack, and sends the optical pickup by meshing with the rack. It is characterized in that transmission torque control means for controlling excessive torque applied to the pinion is provided on the pinion side. The transmission torque control means integrally forms a disk on the end surface of the pinion that meshes with the rack, and abuts one end surface of the feed gear coaxially and slidably with respect to the disk surface. The friction clutch mechanism is characterized in that the elastic body is elastically attached to the other end surface to press the feed gear to transmit power by the frictional force generated between the disk and the feed gear.

According to the present invention, the friction clutch mechanism for transmitting power by frictional force is provided on the pinion side that meshes with the rack, so that excessive torque acting on the rack and the pinion is within a predetermined range due to the slip of the pinion. It becomes possible to control and transmit in.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings.

[0015]

First Embodiment FIGS. 1 to 3 show an optical pickup feeding device according to a first embodiment of the present invention. FIG. 1 is a sectional view of a friction clutch mechanism, and FIG. 2 shows an assembling procedure of the friction clutch mechanism. FIG. 3 and FIG. 3 are front views of the optical pickup feeding device.

The optical pickup feeding device of the present invention is shown in FIG.
As shown in FIG. 2, the optical pickup 1 is configured integrally with the rigid rack 2, and is sent out by the rotation of the pinion 11 that meshes with the rack 2 and is axially supported by the innermost peripheral stopper 3 and the outermost peripheral stopper 4. It is provided slidably on the shaft 5.

The power for sending out the optical pickup 1 is fixed to the motor gear 7, the feed gear 8, the pinion 9 fixed coaxially with the feed gear 8, the feed gear 10, and the feed gear 10 coaxially by driving the feed motor 6. It is sequentially transmitted to the rack 2 via the pinion 11 thus formed.

In the present embodiment, the pinion 11 and the coaxially fixed gear 10 in this apparatus form a disk 13 integrally on one side of the pinion 11 having a shaft hole 12 as shown in FIG. The boss 14 is formed by projecting the circumferential portion of the shaft hole 12 to the disk surface.
The outer shape of the cap 15 is formed in such a size that it can be press-fitted into the inner diameter of the cap 15 having the brim 16 formed on one surface shown on the uppermost side.

Further, the feed gear 10 to be brought into contact with the upper surface 13a of the disk 13 is formed such that the inner diameter thereof is slidable with respect to the outer shape of the cap 15, and the gear 1
0 and the cap 15 are springs 17 which are conical spiral springs so that the inner diameter of the small diameter end is loosely fitted to the outer diameter of the cap 15 and the upper end surface of the spring 17 is brought into contact with the lower surface of the brim 16. Formed on a flat surface. On the other hand, the surface of the large-diameter end is formed to be a flat surface so as to come into contact with the surface of the gear 10.

As shown in the assembly procedure of FIG. 2, these parts are formed by first stacking the gear 10 on the upper surface 13a of the disk 13 integrally formed with the pinion 11, and further stacking the spring 17 so that the inner diameter of the small diameter end of the spring 17 is small. The outer diameter of the cap 15 is fitted to the cap 1 and the cap 1 is resisted against the elastic force of the spring 17.
By pushing 5 toward the pinion 11 side, the gear 10
The inner diameter of the cap 15 is pressed into the outer diameter of the boss 14 of the pinion 11 through the inner diameter of the pinion 11. As a result, the cap 15 and the pinion 11 are integrated via the boss 14. In the assembled state, as shown in FIG. 1, the feed gear 10 is pressed against the pinion 11 side by the compression of the spring 17, and the friction force is generated between the feed gear 10 and the disk 13 formed on the pinion 11. To complete the friction clutch mechanism A.

According to the present embodiment, in the friction clutch mechanism A, the feed gear 10 is pushed by the spring 17 toward the disk 13 formed on the pinion 11, and the feed force is generated by the frictional force generated on the contact surfaces of the two. Gear 10 and Pinion 11
It becomes possible to transmit torque by connecting and. When an excessive torque exceeding the frictional force acts on the contact surfaces of the two, the contact surfaces slip and the rotation of the pinion 11 is stopped, whereby the torque is controlled and transmitted within a predetermined range. .

[0022]

Second Embodiment FIGS. 4 to 6 show an optical pickup feeding device according to a second embodiment of the present invention, FIG. 4 is a sectional view of a friction clutch mechanism, and FIG. 5 is an assembly procedure of the friction clutch mechanism. FIG. 6 is a plan view of the leaf spring.

Friction clutch mechanism B in the present embodiment
Is different from the conical spiral spring 17 used in the first embodiment in that a disc-shaped leaf spring 18 is used and a felt 21 is provided between the disk 13 and the gear 10. Since the configuration is the same as that of the first embodiment, the common gist is denoted by the common reference numeral, and the corresponding description will be omitted.

As shown in the sectional view of FIG. 5, the spring 18 in the present embodiment has a hole 19 formed in the center thereof so that the outer diameter of the cap 15 can be loosely fitted therein, and as shown in the plan view of FIG. Plural pieces (8 pieces in this figure) to adjust to the required elastic force
Radial notch grooves 20 are formed.

Further, the felt 21 is formed in an annular shape having the same outer diameter as the disk 13 and an appropriate width and thickness, and the inner surface and the outer surface of the felt 21 are in contact with the disk 13 of the feed gear 10. An annular concave portion 22 which can be provided with a diameter is formed, and the depth thereof is formed to a size capable of generating a frictional force on the surface of the disk 13 in a state where the surface of the felt 21 is compressed.

As components used for the construction of the friction clutch B, the pinion 11 and the cap 15 are used in the first embodiment.
Is the same as In order to assemble the above parts according to the assembly order of FIG. 5, first, the felt 21 is recessed in the recess 22 of the feed gear 10 and the surface thereof is disc 13
On the surface of the gear 10 with the divergent side of the leaf spring 18 facing downward, and the outer diameter of the cap 15 is fitted into the inner diameter 19 of the leaf spring 18 and the cap 18 resists the elastic force of the spring 18. 15 is pushed toward the pinion 11 side, and the inner diameter of the cap 15 is passed through the inner diameter of the gear 10.
By press-fitting into the outer diameter of the boss 14 formed in No. 1, the pinion 11 and the boss 14 are integrated via the boss 14. As a result, the friction clutch mechanism B shown in FIG. 4 is completed.

According to the present embodiment, the friction clutch mechanism B includes the felt 21 between the feed gear 10 and the disc 13.
The frictional force of the felt 21 acts to stabilize the transmission torque due to the interposition of the interposition, and the noise generated from the contact portion can be reduced, and the same operational effect as that of the first embodiment can be obtained. it can.

[0028]

According to the present invention, by providing the friction clutch mechanism on the pinion side that meshes with the rack and sends out the optical pickup, the friction clutch mechanism slips an excessive torque, so that the torque is always within a predetermined range. Can be controlled and transmitted. Also, when a felt is interposed between the disc formed on the pinion and the gear, it is possible to transmit a stable torque due to the frictional force of the felt and reduce the noise generated from the contact part. You can As a result, even if a shock such as a drop is received, the engagement between the rack and the pinion will not be disengaged, so that a click sound due to the idle rotation of the pinion will not be generated and the tooth tips will not be damaged. Also, in the case of the inner circumference detection method by time control, even if the optical pickup comes into contact with the stopper by turning on the power when the disc is not set, the pinion does not come off the rack, so the unpleasant noise caused by the detachment occurs. It is possible to prevent the occurrence of the electric power generation, and since the motor is not locked in the energized state, it is possible to reduce the consumption of electric power and extend the life.

[Brief description of drawings]

FIG. 1 is a sectional view of a friction clutch mechanism A showing a first embodiment of the present invention.

FIG. 2 is a view showing an assembling procedure of a friction clutch mechanism A.

FIG. 3 is a front view of an optical pickup feeding device.

FIG. 4 is a sectional view of a friction clutch mechanism B showing a second embodiment of the present invention.

FIG. 5 is a view showing an assembling procedure of a friction clutch mechanism B.

FIG. 6 is a plan view of a leaf spring.

FIG. 7 is a front view of a conventional optical pickup feeding device.

FIG. 8 is a front view of a conventional optical pickup feeding device.

FIG. 9 is a front view of a conventional optical pickup feeding device.

[Explanation of symbols]

 1 optical pickup 2 rack 3 innermost peripheral stopper 4 outermost peripheral stopper 5 guide shaft 6 feed motor 7 motor gear 8,10 feed gear 9,11 pinion 12 shaft hole 13 disk 14 boss 15 cap 16 flange 17 spring 18 leaf spring 19 hole 20 Notch Groove 21 Felt 22 Recess

Claims (2)

[Claims] 1. A transmission torque control means for controlling that an excessive torque is applied to a pinion that meshes with a rack and sends out an optical pickup in an optical pickup feeding device for reading optical information by sending an optical pickup by a pinion and a rack. Is provided on the pinion side, and is an optical pickup feeding device for optical information reading. 2. The transmission torque control means integrally forms a disk on an end surface of a pinion meshing with a rack, and abuts one end surface of a feed gear coaxially and slidably on the disk surface. At the same time, it is a friction clutch mechanism that transmits power by frictional force generated at the contact surface between the disc and the feed gear by elastically attaching the elastic body to the other end surface of the feed gear and pressing the feed gear. Claim 1 characterized by
The optical pickup feeding device for optical information reading described.