JPS61206930A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of spot aberration on the surface of a disc by relaxing the impact applied to a carriage or the like within a certain limited range when the carriage collides with a stopper. CONSTITUTION:If a carriage 8 runs away to collide with a right stopper 21, a right sliding plate 20 supporting the stopper 1 is moved slightly right against a spring 20a by its force. The impact of the carriage 8 is absorbed by the spring 20a in this case. If the carriage 8 runs away to collide with a left stopper, the impact is absorbed similarly. Since the impact applied to the carriage 8 or the like is relaxed within a certain limited range when the carriage 8 collides with stoppers 21, the deviation of optical system parts, the distortion of the carriage 8, and the occurrence of spot aberrations on the overall disc surface are prevented effectively, and the destruction of a jacket and a pickup is prevented in an autoloading mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information recording/reproducing device equipped with a carriage.

Conventional JuL Generally, optical information recording and reproducing devices are equipped with a carriage to hold and transport a pickup that converts optical energy into electrical energy, but this carriage may run out of control due to the influence of some external disturbance. It may collide with the stoppers installed on both edges of the track. In that case, the misalignment of the optical system components held in the pickup,
Carriage distortion or overall spot aberration on the disk surface may occur, making it impossible to write information to the disk. In addition, in the autoloading mechanism,
There was a risk that the pickup would collide with a groove forming a long hole provided in the jacket for transporting and positioning the jacket, resulting in damage to the jacket and the pickup.

The present invention was made in view of the above points, and reduces the impact applied to the carriage etc. when the carriage collides with the stopper, and reduces the displacement of optical system components, distortion of the carriage, and overall disk surface. It is an object of the present invention to provide an optical information recording/reproducing device which can prevent the occurrence of spot aberration and also can prevent damage to a jacket and a pickup in an autoloading mechanism.

E1 STATE 11 The optical information recording/reproducing device of the present invention has stoppers provided on both edges of the carriage track to prevent the carriage from running out of track, which are movable in the radial direction of the disk outside the track. , a shock absorber including a biasing means for biasing the stopper toward the inside of the track when the stopper moves outward from the track.

&Supervisor 11 DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on embodiments shown in the drawings.

FIG. 1 shows a first embodiment of an optical information recording/reproducing apparatus according to the present invention, and reference numeral 1 represents a base.

This base 1 has a cross section perpendicular to its longitudinal direction (cross section)
is formed to have a letter shape as shown in FIG. Then, a box l provided at one end of the base l
A motor 2 is installed inside the pole, and a turntable 3 that supports a disk (not shown) is attached to a drive shaft (not shown) of the motor 2. Furthermore, cylindrical rails 4 are attached to the inner surface of the base 1, as shown in FIGS. 2 and 3. This rail 4 extends in the axial direction of the base l, and is fixed to the base l by a port 5 and an L-shaped rail holder 6.

On the other hand, the carriage 8 on which the pickup 7 is mounted is mounted on the second carriage 8.
As shown in the figure, the base 1 is formed into a rectangular tube shape with a hollow portion 8a extending in the axial direction. Three pairs of bearings 9 that mesh with the rail 4 are attached to the lower part of the carriage 8, and the movement of the bearings 9 allows the carriage 8 to move along the rail 4 in the radial direction of the disk. ing. In addition, 3
One of the pair of bearings 9 is attached to the carriage 8 via a leaf spring 9a, as shown in FIG. 4, and the pair of rollers 9 is pressed against the rail 4 by the leaf spring 9a. Further, on the upper surface of the lower wall defining the hollow portion 8a of the carriage 8, a rectangular tube-shaped pobbin 11 having a coil 10 attached to its outer periphery is attached via a pin 12. In addition.

In FIG. 2, reference numeral 8b represents a counterbalance.

On the other hand, a prismatic yoke 13 is provided on the base 1 at a position corresponding to the pobbin 11 so as to extend in the axial direction of the base 1. The prismatic yoke 13 is formed to be loosely fitted to the pobbin 11. . Further, on both sides of the yoke 13, as shown in FIG.

Support members 14 are provided to support the yokes. A recess 14a is formed in the support member 14 at a portion facing the yoke 13, and a plate-shaped permanent magnet 15 is fixed to each of the recesses 14a. Thus, the yoke 13 is engaged with the pobbin 11 screwed onto the carriage 8 so as to be loosely fitted therein.
1 and the permanent magnet 15. Also, below the yoke 13, as shown in FIGS. 1 and 4, #! A shock device 16 is provided. That is, a lower guide plate 17 made of an easily rubbed resin material such as polyacetal resin or Teflon is screwed onto the upper surface of the lower wall of the base 1. Further, above the lower guide plate 17, a surrounding plate 18 is provided for regulating the trajectory of the horse ridge 8.

An upper guide plate 19 made of the same material as the lower guide plate 17 is screwed onto the lower surface of the surrounding plate 18. The surrounding plate 18 is attached to the lower wall of the base 1 so that a certain horizontal gap is formed between the lower guide plate 17 and the upper guide plate 19. In addition, the lower guide plate 17 and the upper guide plate 1
A part of the sliding plate 20 is inserted into the horizontal gap formed by the surrounding plate 18 from both edge sides of the surrounding plate 18. This sliding plate 20 is bent to have a horizontal part and a vertical part, and a spring 20a is hung on the inner end of the track in the horizontal part of the sliding plate 20.
The sliding plates 20 are biased inwardly on the tracks of the carriages 0a and 0a.
A stopper 21 made of an elastic material such as rubber is attached to a vertical portion of the carriage 8 facing inward of the track. Incidentally, it is preferable to install the stopper 2I at a height close to the center of gravity of the carriage 8, in order to prevent twisting, etc., occurring in the carriage 8 due to the moment caused by the deviation between the line of action of the force and the center of gravity. .

Further, the optical information recording/reproducing apparatus of this embodiment is equipped with an optical encoder device 22 as shown in FIG. 2 in order to detect the pickup position. That is, the scale holder 2 is attached to the mounting portion 23 protruding from one side of the carriage 8.
A scale 25 is attached via 4. on the other hand,
A light emitting element 26 and a lens 27 are installed in a portion of the base 1 corresponding to the scale 25 from the outside of the base 1 toward the scale 25. Further, a slit 28 and a detector 2 are provided on the inner surface of the base 1 so as to be located between the scale 25 and the outer surface of the carriage 8.
9 is attached.

Next, the operation of the optical information recording/reproducing apparatus of this embodiment will be explained. By applying current to the coil 10, the carriage 8 is moved along the yoke 13 in the radial direction of the disk.

Furthermore, when the carriage 8 runs out of control due to the influence of some kind of disturbance, the optical information recording/reproducing apparatus of this embodiment operates as follows.

For example, in FIG. 1, if the carriage 8 runs out of control and collides with the right stopper 21, the force causes the right sliding plate 20 supporting the stopper 21 to move against the spring 21.
Move slightly to the right against 0a. At this time, the impact of the carriage 8 is absorbed by the spring 20a. The same applies when the carriage 8 runs out of control and collides with the left stopper 21 in FIG.

According to the optical information recording/reproducing device of this embodiment having such a configuration and operation, the impact force applied to the carriage 8 etc. when the carriage 8 collides with the stopper 20 can be alleviated within a certain finite distance, so that the optical Misalignment of system parts, carriage 8
It is possible to effectively prevent the occurrence of distortion and spot aberration on the overall disc surface, and in the autoloading mechanism, it is possible to prevent damage to the jacket and pickup.

6 and 7 show a second embodiment of the optical information recording/reproducing apparatus according to the present invention. This second
In this embodiment, unlike the first embodiment, the coil 10
The pobbin 11 with which the
There are several.

That is, as shown in FIGS. 7 and 8, two dovetail grooves 30 are formed in the earthen wall of the carriage 8, with the pickup 7 sandwiched between them.
A dovetail 31 corresponding to the dovetail groove 30 is formed on the lower side of the dovetail groove 30, as shown in FIGS. 9(a) and 9(b).

The pobbin 11 is attached to the carriage 8 by fitting the dovetail 31 into the dovetail groove 30, as shown in FIG.

On the other hand, the base 1 is provided with a yoke 13 at a position corresponding to the two pobbins 11. In addition, on the inner side of the wall of the base 1, at a position corresponding to the pobbin ll,
A permanent magnet 15 is provided.

Further, in the optical information recording/reproducing apparatus of this embodiment, a light emitting diode 26, a lens 27, a slit 28, and a detector 29 are incorporated in the carriage 8, unlike the first embodiment. On the other hand, a scale 25 is attached to the base l so as to pass through a space 8C formed in the carriage 8 and extend in the axial direction of the base l.The other configuration is similar to that of the first embodiment. The same components are given the same reference numerals and their explanations will be omitted. Incidentally, regarding the position of the center of gravity of the carriage 8 in this embodiment, the center of gravity of the carriage 8 is located near the scale.

The optical information recording/reproducing apparatus of this embodiment configured as described above can also achieve the same functions and effects as those of the first embodiment.

In the first and second embodiments described above, the spring 20a is used as an example of the biasing means of the shock absorber 16, but in addition to the spring 20a, oil as shown in FIG. It is also possible to use a dashbot 34 consisting of an enclosed cylinder 32 and a piston 33 that can reciprocate within the cylinder 32, and the number of these is not limited to the illustrated embodiment. The fluid sealed in the cylinder 32 of the dashbot 34 may be air, and a sliding ring may be provided at the sliding portion between the piston 33 and the end of the cylinder 32 to smooth the sliding movement.

As explained above, the present invention includes a carriage on which a pickup is mounted and is movable back and forth within a track extending in the radial direction of the disk, and a carriage mounted on both edges of the track. In an optical information recording/reproducing device equipped with a stopper for preventing runaway.

The stopper is movable in the radial direction of the disk outside the track, and further includes a biasing member that urges the stopper inward on the track when the stopper moves outward from the track. Since the shock absorber including the force means is connected, the impact force applied to the carriage etc. when the carriage collides with the stop/pa can be alleviated within a certain finite distance. It can effectively prevent the occurrence of distortion and spot aberration on the overall disc surface, and in the autoloading mechanism, damage to the jacket and pickup can be prevented.
obtain.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a first embodiment of the optical information recording/reproducing apparatus according to the present invention, FIG. 2 is a left side sectional view taken along line 11-II in FIG. 1, and FIG. FIG. 4 is a plan view of the optical information recording/reproducing device shown in FIG. 4, with a part of the shock absorber omitted, and FIG. FIG. 6 is a plan view of an optical information recording/reproducing apparatus according to a second embodiment of the present invention, and FIG.
The figures are a partially cutaway left side cross-sectional view of the optical information recording and reproducing device shown in FIG. 6, FIG. 8 is a plan view of the carriage of the optical information recording and reproducing device shown in FIG. 7, and FIG. 9(a). (b) is the seventh
A schematic diagram of the bobbin of the optical information recording/reproducing device shown in the figure.
FIG. 9(a) is a left side view of the bobbin, FIG. 9(b) is a partially cutaway front view of the bobbin, and FIG. 10 is a longitudinal sectional view of the dashbot. l...Base 3...Turntable 4...Rail 7...Pickup 8...Carriage 9...Bearing 10...Coil 11...Bobbin 13...Yoke 16... Shock absorber 20a...Spring 21...Stopper 3498. Dashpot Fig. 7 Fig. 8 jLl 8 (3Q

Claims (1)

[Claims] (1) An optical information system comprising a carriage on which a pickup is mounted and is capable of reciprocating movement within a track extending in the radial direction of the disk, and stoppers provided at both ends of the track to prevent the carriage from running out of control. In the recording/reproducing apparatus, the stopper is movable in the radial direction of the disk outside the track furnace, and further includes a mechanism for moving the stopper inward of the track when the stopper moves outward from the track. What is claimed is: 1. An optical information recording and reproducing apparatus, characterized in that a buffer device is connected thereto and includes a biasing means for biasing the optical information recording and reproducing device.