JPH06195898A - Optical disk device - Google Patents

Abstract

PURPOSE:To provide a thin optical disk device by means and thin slide feeding mechanism in the optical disk device for writing/reading information. CONSTITUTION:The outer races of bearings 21-25 are fixed on a carriage 1 and the bearing shafts 31-35 of the bearings 21-25 are abutted on guide shafts 41, 42. Consequently, since the outer race of the bearing which occupies a large proportion in the height of a slide feeding mechanism is altered to the much smaller bearing shaft, the height of the slide feeding mechanism is made as lower as possible and the optical disk device itself is made thin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc device for writing / reading information to / from an optical video disc, a compact disc, a magneto-optical disc, etc., and more particularly to an improved slide feeding mechanism for accessing and moving to a target position of each disc. Optical disk device.

[0002]

2. Description of the Related Art An optical disk device is equipped with a disk-shaped optical recording medium (optical disk), and information is written to and read from the optical disk by a pickup. A slide feeding mechanism for moving the pickup to a desired position on the optical disc has been devised.

An optical disk device having a conventional slide feeding mechanism will be described below with reference to FIGS. 4, 5 and 6.
4 is a plan view of a slide feeding mechanism portion of a conventional optical disk device, FIG. 5 is a side view of the slide feeding mechanism portion shown in FIG. 4, and FIG. 6 is a bottom view of the slide feeding mechanism portion shown in FIG.

In FIGS. 4, 5 and 6, the conventional optical disc apparatus is provided with a pickup 10 which moves to a position facing the optical disc 100 to be mounted, and the pickup 10 is moved by a slide feed mechanism. This is a configuration to access and move to a desired position.
This slide feeding mechanism is mounted on the chassis 9 side, the carriage 1 mounted with the pickup 10 and moving in the radial direction of the optical disc 100, the two guide shafts 41 and 42 mounted on the chassis 9 side of the main body. This is a configuration including magnets 51 and 52 and yokes 61 and 62.

The pickup 10 is an optical disc 10
The focus operation is performed so as to keep the distance from 0 constant, and the tracking operation is performed in the radial direction of the optical disc 100 to read / write predetermined information from the optical disc 100.

An escape hole 1 is formed in the carriage 1 in the access direction.
3 and 14 are formed, and the guide shafts 41 and 42 pass through the escape holes 13 and 14, respectively. Further, the carriage 1 has a plurality of pairs of bearings 71, 73, 72.7.
4, 75 and 76 are mounted in a state of facing each other in a V shape via the bearing shafts 81 to 86. This pair of bearings 71, 73, 72, 74,
75 and 76 have their outer rings connected to the guide shafts 41 and 42.
The carriage 1 is supported with the guide shafts 41 and 42 held therebetween. The bearing 76 is fixed to the leaf spring 16 attached to the carriage 1 via a bearing shaft 86.

The bearing 76 is pressed against the guide shaft 42 by the elastic force of the leaf spring 16. The component of the repulsive force is each bearing 71 ・ 73, 72 ・ 74, 75
・ 76 thrust force. This thrust force suppresses the play between the bearings 71, 73, 72, 74, 75 and 76. Further, the repulsive force of the bearing 76 also serves as a force for pressing the bearing 75 against the guide shaft 42.

With these configurations, each bearing 71
73, 72, 74, 75 and 76 are guide shafts 41,
Because it rolls on 42 without rattling, the carriage 1
Is a guide shaft 41 in the radial direction of the optical disc 100,
It becomes possible to move smoothly along 42. Then, the carriage 1 is moved by the driving force generated in the magnetic field between the magnets 51 and 52 and the yokes 61 and 62 in which the mounted coils 11 and 12 are fixed to the chassis 9.

[0009]

In recent years, there has been a great demand for thinning optical disc devices, and therefore the height of the slide feeding mechanism must be reduced. The height of this slide feed mechanism is determined by the height H1 between the tips of the pair of opposed bearings 71, 73, 72, 74, 75 and 76 shown in FIG. In order to reduce this height, conventionally, small bearings 71 to 76 and small diameter guide shafts 41 and 4 are used.
2 is used. However, bearings 71-7
The miniaturization of 6 has a limit in its basic configuration, and the height cannot be sufficiently reduced. Similarly, if the guide shafts 41 and 42 are also reduced in diameter, the weight of the carriage 1 and the bearings 71 to 76 are increased.
The pressing force of causes the bending to occur, making it impossible to function as a guide. For this reason, there is a limit to reducing the diameter of the guide shafts 41 and 42, and there is a problem that the height cannot be sufficiently reduced. Further, the small and special parts are expensive, and there is a problem that the cost is increased due to a slight effect of height reduction.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an optical disc device which is made thin by an inexpensive and thin slide feeding mechanism.

[0011]

In order to achieve this object, in a disk device of the present invention, outer rings of a plurality of bearings are fixed to a carriage on which an optical pickup for writing / reading information to / from an optical disk is mounted. , Each bearing shaft that is rotatably supported at the center of the bearing is brought into contact with the guide shaft, and the guide shaft is sandwiched and supported by each bearing shaft. This is to access and move to the target position.

[0012]

In the present invention, the bearing outer ring, which occupies a large proportion of the height of the slide feed mechanism, can be changed to a bearing shaft that is much smaller, so that the height of the slide feed mechanism can be made as low as possible.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
It will be described based on.

FIG. 1 is a plan view of a slide feeding mechanism portion of an optical disk device according to an embodiment of the present invention, FIG. 2 is a side view of the slide feeding mechanism portion shown in FIG. 1, and FIG. 3 is a slide feeding mechanism shown in FIG. It is a bottom view of a part.

1, 2 and 3, the slide feeding mechanism of the optical disk device according to the present embodiment is the pickup 1
0, a carriage 1 on which 0 is mounted, guide shafts 41 and 42 that support the carriage 1 via bearings 21 to 25 and bearing shafts 31 to 35, and a magnet 5 that applies a driving force for access movement to the carriage 1.
1, 52 and yokes 61, 62, the guide shafts 41, 42 support the carriage 1 unlike the slide feeding mechanism of the conventional optical disk device.

In this slide feed mechanism, the outer rings of a plurality of bearings 21 to 25 are fixed to the carriage 1 and are arranged so as to face each other in a staggered manner.
Bearing shafts 3 rotatably supported on the inner ring of
1 to 35 are brought into contact with the guide shafts 41 and 42, and the bearing shafts 31 to 35 are used to guide the guide shafts 41 and 4.
The carriage 1 is supported by sandwiching the carriage 2. The bearings 21 and 22 are arranged so that the bearing shafts 31 and 32 are inclined toward the optical disc 100 side, and the bearing 23 is arranged such that the bearing shaft 33 is inclined toward the chassis 9 side. The bearing 25 is arranged so as to incline the bearing shaft 35 toward the optical disc 100 side, and the bearing 24 is arranged so as to incline the bearing shaft 34 on the leaf spring 15 toward the chassis 9 side. The guide shaft 41 is sandwiched between the bearing shafts 31 and 32 and the bearing shaft 33, and the guide shaft 42 is sandwiched between the bearing shaft 34 and the bearing shaft 35 so that the carriage 1 can be accessed and moved. The elastic force of the leaf spring 15 causes the bearing shaft 34 to move to the guide shaft 42.
The pressing force against is strengthened. The component of the repulsive force becomes the thrust force of each bearing shaft 31-35. This thrust force suppresses play between the bearing shafts 31 to 35.

With these configurations, the bearing shafts 31 to 35 roll on the guide shafts 41 and 42 without rattling, so that the carriage 1 can move smoothly in the radial direction of the optical disc 100. Then, the carriage 1 is moved by the driving force generated in the magnetic field between the magnets 51 and 52 and the yokes 61 and 62 in which the mounted coils 11 and 12 are fixed to the chassis 9.

The height of this slide feed mechanism is determined by the height H2 between the tips of the bearing shafts 31 to 35 facing each other as shown in FIG. Bearing shafts 31-35
Has a much smaller outer diameter than the bearings 21-25. Therefore, even if a bearing having the same size as that of the conventional technique is used, the total height H2 shown in FIG. 2 is smaller than the conventional height H1 shown in FIG. Further, since the height reducing effect is great, a slide feeding mechanism thinner than the conventional one can be achieved even if a commercially available small bearing is used.

In the above embodiment, the outer rings of the plurality of bearings 21 to 25 are fixed to the carriage 1 and the bearing shafts 31 to 35 are arranged so as to face each other in a staggered manner. The bearing shafts may be arranged so as to face each other as long as they are in contact with the guide shaft, as in the prior art.

[0020]

As described above, according to the present invention, the outer ring of the bearing is fixed to the carriage, and the bearing shaft of this bearing is brought into contact with the guide shaft, so that it occupies a large proportion in the height of the slide feed mechanism. Since the bearing outer ring can be changed to a much smaller bearing shaft, the height of the slide feeding mechanism can be made as low as possible, and the optical disk device itself can be made thinner.

Further, a special component such as a new small component for reducing the height of the slide feeding mechanism is not required, and a precise and precise bearing is not required, resulting in a strong and robust thin slide feeding mechanism and a reduction in product cost. Has the effect of achieving

[Brief description of drawings]

FIG. 1 is a plan view of a slide feeding mechanism portion of an optical disc device according to an embodiment of the present invention.

FIG. 2 is a side view of a slide feeding mechanism portion of an optical disc device according to an embodiment of the present invention.

FIG. 3 is a bottom view of a slide feeding mechanism portion of an optical disc device according to an embodiment of the present invention.

FIG. 4 is a plan view of a slide feeding mechanism portion of a conventional optical disc device.

FIG. 5 is a side view of a slide feeding mechanism portion of a conventional optical disc device.

FIG. 6 is a bottom view of a slide feeding mechanism portion of a conventional optical disc device.

[Explanation of symbols]

 1 Carriage 9 Chassis 10 Pickup 11,12 Coil 13,14 Escape hole 15,16 Leaf spring 21,22,23,24,25 Bearing 71,72,73,74,75,76 Bearing 31,32,33,34, 35 bearing shaft 81, 82, 83, 84, 85, 86 guide shaft 51, 52 magnet 61, 62 yoke 100 optical disk

Claims (2)

[Claims] 1. An optical disc in which a carriage on which an optical pickup for writing information to and reading information from the optical disc is mounted slides on a guide shaft which is arranged substantially parallel to the radial direction of the optical disc to be mounted. An optical disk device that is moved to a target position of, wherein outer rings of a plurality of bearings are fixed to the carriage, each bearing shaft rotatably supported at the center of the bearing is brought into contact with the guide shaft, An optical disk device characterized in that a guide shaft is supported by a bearing shaft in a sandwiched state. 2. The optical disk device according to claim 1, wherein outer rings of a plurality of bearings are fixed to the carriage, and the bearing shafts are arranged so as to be alternately opposed to each other.