JPS61150170A - Pickup driving device - Google Patents

Abstract

PURPOSE:To reduce the number of parts and to simplify the construction of a pickup driving device by driving a pickup driving external thread shaft by a high speed and a low speed stepping motors connected to both ends thereof respectively. CONSTITUTION:Both ends of an external thread shaft 10 for driving and controlling a pickup device 17, respectively are connected to a high speed stepping motor 3 and a low speed stepping motor 5. The shaft 10 is rotated by the electrically separated motor 3 or the motor 5. For these members, a clutch, a final reduction gear and the like are not required, the number of the parts are 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.

[Conventional technology]

Conventionally, disc-shaped recording media (hereinafter referred to as information discs)
When the pickup is rotated and the pickup is moved in the radial direction relative to the rotating information disk to reproduce and read out recorded information on the information disk, various pickup drive devices are used. There is something.

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 the internal threaded body of the pickup device slidably supported on the guide 0 parallel to the 0, position it,
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, disconnect the low-speed motor using a clutch. Removing the load.

Therefore, the number of parts such as a reduction gear, a clutch, and clutch control parts is large, and the structure is complicated, resulting in high costs.

The present invention attempts to solve the above-mentioned problems, and aims to reduce the number of parts without using a reducer, a clutch, etc., and to simplify the configuration and make it inexpensive. It is something.

[Means for solving problems]

The pickup drive device of the present invention includes a base, a high-speed motor provided on one side of the base, a low-speed stepping motor provided on the other side of the base, and a motor between the one motor and the other. a threaded shaft connected at both ends to a stepping motor; a carriage having a female threaded body screwed to the threaded shaft on the negative side and a rolling wheel in contact with the base on the other side; The present invention is characterized by comprising a pickup device provided therein.

[Effect]

The present invention rotates the screw shaft by driving the high-speed motor or the low-speed stepping motor while the high-speed motor and low-speed stepping motor are connected to the screw shaft. It moves a carriage with a

〔Example〕

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

1 is a plate-shaped base, and a DC motor 3 for high-speed access is attached to one side of the base 1 via a support 2, and a DC motor 3 for high-speed access is attached to the other side of the base 1 via a support 4. A low-speed servo stepping motor 5 is attached, and both ends of a screw shaft 10 are connected via a connector 8.9 to a drive shaft 6.7 arranged coaxially with both motors 3.5.

Reference numeral 11 denotes a carriage, and a connecting base 12 is provided protruding from one side of the carriage 11, and bearings 13 that are slidably fitted to the screw shaft 10 are provided on both sides of the connecting base 12, and one A female screw body 14 screwed onto the screw shaft 10 is provided in the bearing 13 portion. This female screw body 14
is integrally formed of synthetic resin or the like, has axial slits 15 on both sides, and is always biased in a direction to clamp the screw shaft 10. Further, on the other side of the carriage 11, a roller 16 that rolls in contact with the base 1 is mounted on a shaft. Furthermore, a pickup device @1 is mounted on the carriage 11.
7 is provided. This pickup device 17 has a laser emitting section 18 disposed above the base 1, and a light receiving section 20 facing the light emitting section 18 below the base 1 via an arm 19. ing.

Further, the base 1 is formed with laser beam passages 11 and 21 corresponding to the moving parts of the light emitting part 18 and the light receiving part 20, and the base 1 is formed with laser light passages 11 and 21 corresponding to the moving parts of the arm 19. A notch groove 22 is formed.

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

Then, the information disk 23 is placed along the lower surface of the base 1 and rotated.

Then, the pickup device 1 for the information disc 23
7, in the case of positioning and fast forwarding, the high-speed motor 3 is driven, and in the case of playback and reading by the pickup device 17, the low-speed stepping motor 5 is driven, or the low-speed stepping motor 5 and the high-speed motor 3 are driven. is driven to rotate the screw shaft 1o in either the forward or reverse direction, and the carriage 11 is moved in either direction through the screw engagement with the female screw body 14. At this time, the carriage 11 moves while being supported on the screw shaft 1o by the bearing 13 on the minus side and supported on the base 1 by the rolling wheels 16 on the other side. Along with this,
Laser light from the light emitting unit 18 of the pickup device 11 is irradiated onto the information disc 23 through the passage Tl 421 of the base 1, and the light transmitted through the information disc 23 is received by the light receiving unit 20, and this is transmitted to a playback device (not shown) and a readout unit. Depending on the device, information is played back as video or video/audio.

Further, the high-speed motor 3 and the low-speed stepping motor 5 are both directly connected to the screw shaft 10 and driven by electrically disconnecting one of them.

Note that the female screw rest 14 of the carriage 11 is integrally formed of synthetic resin, etc., and slits 15 are provided on both sides so that the screw shaft 10
By biasing in the direction of pinching, the backlash with the screw shaft 10 can be reduced and the carriage 11 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, when a high-speed motor or a low-speed stepping motor is driven to rotate a screw shaft and move a carriage having a pickup device via a female threaded body, a high-speed motor and a low-speed stepping motor are driven. Since the stepping motors are electrically disconnected from each other and driven while connected to the screw shaft, the number of parts can be reduced without using conventional reducers, clutches, etc., and the configuration can be simplified. It can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the apparatus of the present invention, and FIG. 2 is a plan view thereof. 1. Base, 3. Motor for high speed, 5. Stepping motor for low speed, 10. Screw shaft, 11. Carriage, 14. Female threaded body, 16. Rolling wheel, 17. Pick up. Device.

Claims (1)

[Claims] (1) A base, a high-speed motor provided on one side of the base, a low-speed stepping motor provided on the other side of the base, and both ends of the one motor and the other stepping motor. a threaded shaft connected to the threaded shaft, a carriage having a female threaded body screwed onto the threaded shaft on one side and having a rolling wheel in contact with the base on the other side, and a pickup device provided on the carriage. A pickup drive device comprising: