JPS61150171A - Pickup driving device - Google Patents

Abstract

PURPOSE:To reduce the number of the parts and to simplify the construction by controlling a rotation of a pair of worm shafts by a pair of motors and moving a pickup carriage through a worm wheel. CONSTITUTION:A rotation of worm shafts 8, 9 is controlled by a high speed access, and a low speed servo direct current motors 8, 9, respectively. A worm wheel 19 integrated with a pickup carriage 15 is rotated. The carriage 15 slid and guided by bearings 16, 17 is moved straight linearly through the wheel 19. For these members, a clutch, a final reduction gear and the like are not required, the number of the parts is reduced and the construction of the pickup driving device can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pickup drive device used for reproducing and reading a disc-shaped recording medium.

(Prior Art) Conventionally, when a disk-shaped recording medium (hereinafter referred to as an information disk) is rotated and a pickup is moved in the radial direction with respect to the rotating information disk, recording information on the information disk is reproduced and read. Various types of pickup drive devices are used, and for example, there is a screw shaft type device.

This conventional screw shaft type has a high-speed motor connected to one end of the screw shaft, and a low-speed motor connected to the other end of the screw shaft via a reducer and clutch. Screw together the female threaded body of the pickup device that is slidably supported on the guide rod parallel to the
For fast forwarding, it drives the high speed motor, and also for playback,
In the case of reading, a low speed motor, or a low speed motor and a high speed motor are driven to rotate the screw shaft and move the pickup device via the female screw body.

[Problem that the invention seeks to solve]

However, according to the above-mentioned device, a clutch is required in addition to a reduction gear on the low-speed motor side. In other words, when driving a high-speed motor, if the low-speed motor remains connected, the load on the reducer will be excessive, so when driving the high-speed motor, the low-speed The load is removed by disconnecting the power source.

Therefore, a reduction gear, a clutch, clutch control parts, etc. are required, resulting in a complex structure and high cost.

The present invention is intended to solve the above-mentioned problems, and aims to simplify the configuration without using a reduction gear, a clutch, etc., and to make it inexpensive.

[Means for solving problems]

The pickup drive device of the present invention includes a base, a pair of worm shafts rotatably supported in parallel with each other on the base, and a motor connected to each of the pair of worm shafts. a carriage slidably provided on the pair of worm shafts, a worm wheel rotatably mounted on the carriage and meshed with the pair of worm shafts, and a pickup device provided on the carriage. It is characterized by comprising the following.

[Effect]

The present invention drives a pair of motors to rotate one or both of a pair of worm shafts, and moves a carriage having a pickup device via a worm wheel.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a plate-shaped base, and a pair of worm shafts 4.5 are mounted on this base 1 via bearings 2 and 3 at both ends, spaced apart from each other and parallel to each other. A pair of motors 8.5 are rotatably supported and attached to one end of the pair of worm shafts 4.5 on the base 1 via supports 6, 7.
Nine drive shafts 10 and 11 are connected via connectors 12 and 13, respectively. One motor 8 is a DC motor for high speed access, and the other motor 9 is a DC motor with a reduction gear for low speed servo.

Reference numeral 15 denotes a carriage, and bearings 16 are fitted on both sides of the carriage 14 to be slidably fitted to the pair of worm shafts 4.5.
．． 17 is provided, and a support shaft 18 is provided in the center of the carriage 15, and a worm wheel 19 is rotatably mounted on this support shaft 18.
9 is engaged with the pair of worm shafts 4 and 5 on both sides thereof. Furthermore, a pickup device 20 is provided on the carriage 15. This pickup device 20 has a laser emitting section 21 disposed above the base 1, and a light receiving section 23 facing the light emitting section 21 below the base 1 via an arm 22.
is provided.

Further, the base 1 is formed with a laser beam passage groove 24 corresponding to the moving part of the light emitting part 21 and the light receiving part 23°, and the base 1 is formed with a groove 24 corresponding to the moving part of the arm 22. A cutout groove 25 is formed.

26 is, for example, a flexible transparent information disk on which information is recorded concentrically.

Then, the information disk 26 is placed along the lower surface of the base 1 and rotated.

Then, one or both of the pair of motors 8 and 9 is driven to rotate the pair of worm shafts 4.5 in either the forward or reverse direction, thereby rotating the worm wheel 19 and moving the carriage 15 in either direction. Moving. That is, for example, when one motor 8 rotates forward one rotation, if the other motor 9 is stopped, the carriage 15 moves in the forward direction by 1X pitch, and the other motor 9 rotates one rotation at the same time.
When the motor 9 is rotated in the forward direction, the carriage 15 moves in the forward direction by two pitches, and when the other motor 9 is rotated in the reverse direction by one rotation, the carriage 15 does not move. Also, when one motor 8 is rotated forward two rotations, the other motor 9 is rotated one rotation.
When the carriage 15 is rotated in the opposite direction, the carriage 15 moves by 1x pitch in the forward direction.

In this way, by rotating or stopping the pair of worm shafts 4 and 5 by the pair of motors 8 and 9, the carriage 15 is rotated through engagement with the worm wheel 19.
send in either direction. Then, when the pickup device 512G locates the information disk 26 and performs fast forwarding, the information is sent at high speed, and when the pickup device 20 plays back or reads the information, the information is sent at low speed. At this time, the carriage 15 moves while being supported by the worm shafts 4 and 5 by bearings 111i and 17 on both sides. At the same time, the laser beam from the light emitting section 21 of the pickup device 20 is irradiated onto the information disk 26 through the through groove 24 of the base 1, and the light transmitted through the information disk 26 is received by the light receiving section 23, which is shown in the figure. The information is played back as video or video/audio using a playback device or readout device that does not.

The worm foil 19 of the carriage 15 is constructed by concentrically overlapping two foil plates 31 and 32 of the same shape, as shown in FIGS.
A bottle 33 protruding from the upper foil plate 310) and a long hole 34
A coil spring 36 is stretched between the bottle 35 protruding from the lower foil plate 32 through the two foil plates 31.
．． 32 in one direction, the teeth of the two foil plates 31 and 32 sandwich the teeth of the worm shafts 4 and 5, reducing backlash l between the worm shafts 4 and 5. , the carriage 15 can be moved stably.

Further, in the above embodiment, the pickup device has a light-emitting part and a light-receiving part and uses a soft transmissive information disc, but the information disc may be a hard one such as a laser disc or an audio disc. When using an optical reflection type, needle contact type, etc., an appropriate pickup device corresponding thereto may be used.

〔Effect of the invention〕

According to the present invention, the pair of motors are driven to rotate one or both of the pair of worm shafts, and the carriage having the pickup device is moved via the worm wheel. By using co-movement or differential motion, the feed of the carriage can be easily controlled, and the configuration can be simplified without using conventional reduction gears, clutches, etc., and it can be provided at low cost.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the device of the present invention, Fig. 2 is a partially cutaway side view, Fig. 3 is a plan view of the worm foil, and Fig. 4 is a side view thereof. FIG. 5 is an enlarged plan view of a portion thereof. 1. Base, 4, 5. Worm shaft, 8, 9. Motor, 154. Carriage, 19. Worm wheel, 20
...Pickup device.

Claims (1)

[Claims] (1) A base; a pair of worm shafts rotatably supported in parallel with each other at intervals on the base; a motor connected to each of the pair of worm shafts; and the pair of worm shafts. A worm wheel rotatably mounted on the carriage and meshed with the pair of worm shafts, and a pickup device provided on the carriage. A pickup drive device featuring: