JPH07122008A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain the disk recording and reproducing device capable of moving a pickup at high speed and also evading the problem of noise to be generated at the time of high speed rotation of a motor. CONSTITUTION:A high speed gear 20 and a low speed gear 21 are borne by a rotary shaft 17 having a main gear 16 and a subgear 19, which are integrally rotated by rotational torque from the motor in a different gear ratio. Then, by changeover operation of a mode changeover mechanism 23, at the time of a high speed mode of the pickup, a rack of the pickup is fed at high speed via the high speed gear 20 by the main gear 16, and at the time of a low speed mode of the pickup, the rack of the pickup is fed at low speed via the low speed gear 21 by the subgear 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording and / or reproducing optical disk recording / reproducing apparatus.

[0002]

2. Description of the Related Art Conventionally, an optical disc apparatus for recording and reproducing information by using a magneto-optical system has an optical pickup for irradiating a laser beam on the disc surface and a disc surface facing the optical pickup with the disc surface interposed therebetween. And a magnetic head for applying a bias magnetic field.

More specifically, the optical pickup performs a recording operation or a reproducing operation of information on the disk surface while slidingly moving from the outer peripheral direction of the disk to a direction traversing the track of the disk by using a DC motor as a drive source. The speed reduction ratio of the pickup is determined by the characteristics of the slide servo during normal recording and reproduction, and is designed with an extremely high speed reduction ratio.

[0004]

Therefore, there is a problem in that the moving speed does not increase when the information on the disk is searched at high speed or the pickup is moved between disks. Also,
When the number of rotations of the DC motor is increased to increase the moving speed of the pickup, there is a problem that the motor noise increases.

The present invention has been made in order to solve the above-mentioned problems, and provides a disk recording / reproducing apparatus capable of moving a pickup at high speed and avoiding the problem of noise. With the goal.

[0006]

In order to achieve the above object, a disc recording / reproducing apparatus according to the present invention comprises a pickup for recording information on a record carrier disc or reproducing the recorded information, and a pickup for reproducing the recorded information. In a disk recording / reproducing apparatus having a moving mechanism that linearly moves by a driving force of a motor, a speed reducing mechanism is provided between the motor and the moving mechanism, and a speed reducing ratio of the speed reducing mechanism is switchable. .

Further, in the disk recording / reproducing apparatus according to the preferred embodiment of the present invention, the reduction ratio of the reduction mechanism is changed by the cam means for changing the engagement of a plurality of gears having different numbers of teeth.

A disk recording / reproducing apparatus according to a preferred embodiment of the present invention is a crown gear having engaging claws on the opposed planes of a pair of gears.

Further, in the disk recording / reproducing apparatus according to the preferred embodiment of the present invention, the reduction ratio of the reduction mechanism can be switched between normal reproduction and high speed reproduction.

[0010]

In the disk recording / reproducing apparatus of the present invention having the above-described structure, the moving mechanism supporting the pickup is slid through the reduction mechanism capable of switching the reduction ratio from the motor rotating at a constant speed. Therefore, the speed reduction mechanism can be switched to the one having a larger speed reduction ratio to enable the low speed slide traveling of the pickup. Further, by switching to the one with a smaller reduction ratio, the high speed slide traveling of the pickup becomes possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk recording / reproducing apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of the disc recording / reproducing apparatus of this example, and FIG. 2 is a side view of the same.
The deceleration switching mechanism is shown separately.

In both figures, reference numeral 1 is a main chassis, and an opening 1a is formed on almost the entire surface. A pickup 2 is provided with the optical hand 3 facing upward, and is supported by a slide member 4 as a moving mechanism. The slide member 4 is inserted into and attached to a guide shaft 6 supported by a guide member 5 provided at one end thereof so as to traverse the opening 1a of the main chassis 1, and the other end of the slide member 4 is formed at the end thereof. The guide piece 7 is engaged with the opening edge of the main chassis 1. As a result, the slide member 4 can move along with the pickup 2 along the guide shaft 6.

A first rack 8 and a second rack 9 are provided on the back surface of the slide member 4 in the moving direction of the slide member 4, respectively. One of the first racks 8 is provided with a preload rack 10 for absorbing backlash.

On the other hand, a sub chassis 11 is fixed to the back surface of the main chassis 1. A deceleration switching mechanism 12 is mounted on the sub-chassis 11, and its plan view is shown in FIG.

A DC motor 13 is mounted on the sub-chassis 11, and a worm 14 provided on an output shaft of the motor 13 is meshed with a main gear 16 via a reduction gear 15.

Next, details of the deceleration switching mechanism 12 shown in FIG. 4 will be described. The main gear 16 described above is integrally formed at the lower end of a cylindrical rotary shaft 17, and the rotary shaft 17 supports the main gear 16 by fixing the lower end of a shaft 18 inserted through the center thereof to the sub chassis 11. And the rotating shaft 1
A sub gear 19 is fixed to the upper end portion of 7.

Further, a large-diameter high-speed gear 20 having a large number of teeth and a small-diameter low-speed gear 21 having a small number of teeth are rotatable on the rotary shaft 17 between the main gear 16 and the sub gear 19. And it is supported so as to be movable in the axial direction. A coil spring 2 is provided between the high speed gear 20 and the main gear 16.
2 intervenes and urges the high speed gear 20 in the direction of separating. Then, crown gears 16a and 20a as crown gears are formed on the surfaces of the main gear 16 and the high speed gear 20 which face each other, and the crown gear 19a is also formed on the surface of the sub gear 19 and the low speed gear 21 which face each other. And 21a are formed.

The high-speed gear 20 thus constructed can be engaged with and disengaged from the second rack 9 of the slide member 4, and the low-speed gear 21 can be engaged with and disengaged from the first rack 8. The contact surface between the high speed gear 20 and the low speed gear 21 is formed to have a small frictional resistance.

The mode switching mechanism of the above-described deceleration switching mechanism 12 will be described with reference to FIGS. 3 and 4. The mode switching mechanism is indicated by reference numeral 23. The sub-chassis 11 is equipped with a mode switching motor 24.
A cam gear 27 meshes with a worm 25 provided on the output shaft of the above through a reduction gear 26. The cam gear 27 is provided with two cams 28a and 28b having different heights.
The position of the cam gear 27, that is, the rotational positions of the cams 28a and 28b are detected by a sensor (not shown), and the motor 24
It is determined by controlling the rotation.

The sub chassis 11 is attached to the cams 28a and 28b.
An actuating piece 31a at one end of a link 31, which is rotatable about a shaft 30 as a fulcrum, corresponds to the frame 29 supported by
The other end of the link 31 is formed into a forked portion 32, and the pressing portions 32a, 32a provided at the tip of the forked portion 32 are in contact with the upper surface of the low speed gear 21 described above.

Next, the switching operation between the high speed mode and the low speed mode of the pickup 2 will be described with reference to FIGS. FIG. 4 a shows the low speed mode state, in which the operating piece 31 of the link 31 is shown.
a is in contact with the low cam 28a of the cam gear 27. In this state, the link 31 does not rotate, and the pressing pieces 32a, 32a are in loose contact with the surface of the low speed gear 21. Therefore, the low-speed gear 21 is pushed up together with the high-speed gear 20 by the spring force of the coil spring 22, and the high-speed gear 20 is in a free state, but the low-speed gear 21 has its crown gear 21a whose crown gear 19 is the sub gear 19.
The gear 21 for low speed is engaged with the pickup 2
Is engaged with the first rack 8 of the slide member 4 supporting the.

Therefore, the drive torque of the DC motor 13 causes the main gear 1 to travel from the worm 14 through the reduction gear 15.
When 6 rotates, the sub gear 19 is rotationally driven together with the rotary shaft 17, and the low speed gear 21 is rotationally driven via the crown gears 19a and 21a, so that the first rack 8 is slid in a low speed state, The pickup 2 can be fed normally.

FIG. 4b shows the fast mode condition, link 3
The first operating piece 31a abuts on the high cam 28b of the cam gear 27 and pushes it up. For this reason, the link 31 rotates about the shaft 30 as a fulcrum, and presses the pressing pieces 32a, 32a of the forked portion 32.
Thus, the surface of the low speed gear 21 is strongly pressed, so that the low speed gear 21 and the high speed gear 20 are pressed down against the spring force of the coil spring 22. As a result, the low speed gear 21
Is in a free state apart from the sub gear 19, but the crown gear 20a of the high speed gear 20 meshes with the crown gear 16a of the main gear 16, and the high speed gear 20 is the second gear of the slide member 4 supporting the pickup 2. Engage with rack 9.

Therefore, the driving torque of the DC motor 13 causes the main gear 1 to travel from the worm 14 through the reduction gear 15.
When 6 is rotated, the high-speed gear 20 is rotationally driven via the crown gears 16a and 20a, so that the second rack 9 is slid in a high-speed state and the pickup 2 can be fed at high speed.

As described above, the disc recording / reproducing apparatus of the present invention uses the deceleration switching mechanism 12 and the mode switching mechanism 23 in a state in which the rotation speed of the motor 13 is set constant, so that the high speed gear 20 and the low speed gear are used. Since the pickup feed speed can be switched according to the ratio of the number of teeth of 21, the high-speed search of information on the disc and the movement speed of the pickup can be increased. Therefore, normal reproduction and high-speed reproduction can be performed. You can enable it.

Further, even if the feed speed of the pickup is high, the rotation speed of the motor is a steady speed, so that the motor speed is not increased and no noise is generated.

FIG. 5 shows another embodiment of the deceleration switching mechanism 12. The worm 52 of the output shaft of the DC motor 51 meshes with a large-diameter high-speed gear 54 via a reduction gear 53. The high-speed gear 54 faces the small-diameter low-speed gear 55, is rotatably supported by a shaft 56 fixed to the sub-chassis 11, and the high-speed gear 54 is movable in the shaft 56 direction. Further, a coil spring 57 is interposed between the high speed gear 54 and the low speed gear 55, and biases the high speed gear 54 in a direction away from the low speed gear 55. Further, crown gears 54a and 55a are formed on the surfaces of the gears 54 and 55 that face each other. still,
Although not shown, the high speed gear 54 is equipped with the mode switching mechanism 23 shown in FIG.

On the other hand, in the sub-chassis 11, a three-stage gear 58 having a stepwise different gear diameter is rotatably supported by a shaft 59. Of the three-stage gear 58, the large-diameter transmission gear 60 constantly meshes with the low-speed gear 55 described above, the medium-diameter transmission gear 61 can be engaged with and disengaged from the high-speed gear 54, and the small-diameter transmission gear. The (pinion) 62 meshes with a rack 63, which is a slide member on which a pickup is mounted.

The deceleration switching mechanism 12 configured as described above.
5 shows the high-speed mode state of the pickup in FIG. That is, when the reduction gear 53 is rotated from the worm 52 by the driving torque of the DC motor 51, the reduction gear 53 is transmitted from the high speed gear 54 to the transmission gear 61 of the three-step gear 58, and the rack 63 is slid from the transmission gear 62 to move the pickup at high speed. Can be made. At this time, the low speed gear 55 is freely rotating while meshing with the transmission gear 60 of the three-stage gear 58.

When the pickup is in the low speed mode, the high speed gear 54 is pushed down by the operation of the deceleration switching mechanism 12, so that the high speed gear 54 is disengaged from the transmission gear 61 of the three-stage gear 58 and the high speed gear 54 is moved. The crown gear 54a is engaged with the crown gear 55a of the low speed gear.

Therefore, in such a switching state, D
When the reduction gear 53 is rotated from the worm 52 by the drive torque of the C motor 51, it is transmitted from the freely rotating high speed gear 54 to the low speed gear 55 via the crown gears 54a and 55a, and then through the transmission gear 60 of the three-stage gear 58. Transmission gear 62
As a result, the rack 63 can be slid to move the pickup steadily.

The present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the spirit of the invention.

For example, in both of the above-mentioned embodiments, the drive system using the rack and the pinion was explained as the drive means of the pickup, but in addition, a ball screw drive system or a belt drive system may be adopted.

Further, the disc recording / reproducing apparatus of the present invention is
Widely applied to disk devices for reproducing or recording / reproducing using an optical pickup such as optical modulation type optical disk device, read-only optical disk device, phase change type disk device, magnetic field modulation type magneto-optical disk device or optical intensity modulation type magnetic disk device. It is possible.

[0035]

As described above, in the disc recording / reproducing apparatus according to the present invention, in the disc recording / reproducing apparatus having the moving mechanism for linearly moving the pickup by the driving force of the motor, between the motor and the moving mechanism. Since the speed reduction mechanism is provided and the speed reduction ratio of this speed reduction mechanism can be switched, the pickup can be switched between steady feed and high speed feed, which enables the motor to search information on the disk at high speed at a steady speed. There is an effect that the moving speed of the pickup can be increased.

Further, even if the pick-up feed speed is high, the motor rotation speed is a steady speed, so that the motor speed is not increased and therefore noise is not generated.

[Brief description of drawings]

FIG. 1 is a plan view of a disc recording / reproducing apparatus of this example.

FIG. 2 is a side view showing separately the deceleration switching mechanism in the disk recording / reproducing apparatus of this example.

FIG. 3 is a plan view of a deceleration switching mechanism and a mode switching mechanism.

FIG. 4 is a detailed operation diagram of a deceleration switching mechanism and a mode switching mechanism.

FIG. 5 is a configuration diagram of another embodiment of a deceleration switching mechanism.

[Explanation of symbols]

 1 Main Chassis 2 Pickup 3 Optical Head 4 Fried Member 8 First Rack 9 Second Rack 11 Sub-chassis 12 Speed Reduction Switching Mechanism 13 DC Motor 15 Speed Reduction Gear 16 Main Gear 16a Crown Gear 19 Sub Gear 19a Crown Gear 20 High Speed Gear 20a Crown gear 21 Low speed gear 21a Crown gear 22 Coil spring 23 Mode switching mechanism 24 Motor 26 Reduction gear 27 Cam gear 28a, 28b Cam 31 Link 32 Forked portion 53 Reduction gear 54 High speed gear 54a Crown gear 55 Low speed gear 55a Crown gear 57 coil spring 58 three-stage gear 63 rack

Claims (4)

[Claims] 1. A disc recording / reproducing apparatus comprising: a pickup for recording information on a record carrier disc or reproducing the recorded information; and a moving mechanism for linearly moving the pickup by a driving force of a motor. A disc recording / reproducing apparatus, characterized in that a reduction mechanism is provided between the motor and the moving mechanism, and a reduction ratio of the reduction mechanism is switchable. 2. The disk recording / reproducing apparatus according to claim 1, wherein the reduction ratio of the reduction mechanism is changed by a cam means for changing engagement of a plurality of gears having different numbers of teeth. 3. The disk recording / reproducing apparatus according to claim 2, wherein the plurality of gears are crown gears having engaging claws on opposing planes of a pair of gears. 4. The speed reduction ratio of the speed reduction mechanism during normal reproduction,
2. The disc recording / reproducing apparatus according to claim 1, wherein the disc recording / reproducing device is switched between high speed reproduction and high speed reproduction.