JPH0823965B2 - Optical information recording / reproducing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention is to record or reproduce information by moving a card-shaped optical information recording medium in a predetermined direction with respect to an optical head that irradiates the recording medium with a light beam. The present invention relates to an optical information recording / reproducing device that operates.

In the present invention, the optical information recording / reproducing apparatus refers to an apparatus for recording information on the medium as described above, an apparatus for reproducing information recorded on the medium, and an apparatus for performing both recording and reproduction.

[Prior Art] Conventionally, various types of media such as a disc, a card, and a tape are known as forms of a medium for recording information by using light and reading the recorded information. Among these, a card-shaped optical information recording medium (hereinafter referred to as an optical card) is expected to be in great demand as a medium having a large storage capacity that is small and lightweight and convenient to carry.

By the way, when recording or reproducing information on the optical card as described above, a mechanism for moving the optical card relative to the optical head is required. The one shown in FIG. 4 is provided.

In FIGS. 2 to 4, 6 is a holding base for holding the optical card, and a step 7 is provided on one side of the holding base, which is slightly smaller than the thickness of the optical card 5 between the card holding members 8 and 9. A wide gap is formed in the. The optical card 5 is inserted into this gap, and is held by being pressed against the edge of the step 7 by the spring members 10 and 11. Further, the holding table 6 is provided with a projection 12 for stopping the inserted optical card 5 at a predetermined position and a notch 13 for facilitating the insertion and removal of the optical card.

Holes are formed at both ends of the holding base 6, and are slidably supported by fixed shafts 16 and 17 as guide members via bearings 14 and 15 which are fitted in the holes and which are made of a material having a good sliding property. There is. The fixed shafts 16 and 17 are arranged along the arrow A direction,
It is fixed to the chassis 22 by fixing tools 18, 19, 20, and 21. Here, the holding table 6 is given a driving force by the belt 23 which is fixed, and moves in the direction of arrow A. An optical head 24 is provided above the holding table 6 to irradiate the optical card 5 with a light beam to record or reproduce information. The optical head 24 is moved in the direction of arrow B along the guide 26 by the head feed screw 25 and stopped at a desired position for recording or reproduction. When recording and reproducing are continuously performed, the optical card 5 is stepwise fed in the direction of the arrow B in synchronization with the reversal of the moving direction of the optical card 5.

In the configuration as described above, assuming that the holding table 6 and the fixed shafts 16 and 17 have sufficient strength so that the influence of deformation can be ignored, the positional deviation that occurs in the direction of arrow B when the holding table 6 reciprocates. Is mainly caused by a gap (so-called play) indispensable to the sliding portion between the fixed shafts 16 and 17 and the bearings 14 and 15. In this configuration, the holding base 6 is pressed by the shake preventing springs 27 and 28 to be pressed against one side of the bearing, and the backlash is moved in one direction to prevent the above-mentioned displacement. One end of the shake prevention springs 27 and 28 is fixed to the holding table 6, and the other end is provided with rollers 29 and 30 that rotate smoothly. These rollers 29, 30 are in contact with the rail 31, and while keeping the holding table 6 movable in the direction of arrow A, the spring 27,
The holding table 6 is pressed by the elastic force of 28. With such a configuration, the positional deviation in the direction of arrow B when the optical card reciprocates is suppressed to 5 μm or less. Incidentally, the above-mentioned bearing 14
Has a long hole in which the arrow B direction is the longitudinal direction, and does not have a function of restricting the movement in the B direction. Further, the belt 23 described above moves the holding table 6 with respect to the optical head 24 by a mechanism shown in a schematic side view in FIG.
Here, the belt 23 fixed to the holding table 6 includes a rotatable pulley 32 and a pulley 33 attached to a servomotor 34.
It has been passed over. Therefore, the belt 23 moves in the direction of arrow A in accordance with the rotation of the servo motor 34, and the holding table also moves in the direction of A along with it.

[Problems to be Solved by the Invention] However, in the above-described conventional moving mechanism, the rail 31 extending in the moving direction of the holding table 6 is provided at each position in the arrow A direction of the holding table 6 in order to prevent backlash. Was needed. Therefore, there is a drawback that not only the number of parts constituting the device is increased but also the device is enlarged.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide an optical information recording / reproducing apparatus which has a small number of parts and can be miniaturized.

Then, the above-mentioned object is an optical information recording / reproducing apparatus for moving a card-shaped optical information recording medium in a predetermined direction with respect to an optical head to record or reproduce information, and a holding table for holding the recording medium, and A pair of guide shafts for guiding the holding base in the predetermined direction, a plurality of bearings arranged on the holding base for supporting the holding base with respect to the guide shafts, and a part of the plurality of bearings. Bearing of
Urging means mounted on the holding base for urging the guide shaft by a spring force, and some of the plurality of bearings are movably supported with respect to the holding base. The remaining bearings are fixedly supported with respect to the holding base, and the urging means is achieved by urging the displaceably supported bearings toward the guide shaft.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 (a) and 1 (b) show a configuration of an embodiment of the present invention, and are a plan view and a front view, respectively. Where the optical head,
The card holding table and the driving means for the holding table are not shown because they are similar to the above-mentioned conventional structure.

In FIG. 1, a holding base 36 for holding an optical card is connected to a fixed shaft 38 via a bearing, and is also connected to a fixed shaft 39 via a fixture 40 having a built-in bearing and the like. Therefore the holding table
36 can slide smoothly in the A direction. The convex portion of the holding base 36 is engaged with the concave portion of the fixture 40 so as to be slidable in the B direction. A spring 35 (biasing means) is provided between the holding table 36 and the fixing tool 40, and is essential for the sliding portion existing between the bearings built in the holding table 36 and the fixing tool 40 and the fixed shafts 38 and 39. The backlash is pressed in a certain direction. According to this configuration, the holding table 36
It is possible to minimize the shake in the B direction when the A moves back and forth in the A direction. Further, unlike the conventional moving mechanism, a rail extending in the moving direction of the holding table is not required, so that the number of parts of the device is not increased and the device is not enlarged.

EFFECTS OF THE INVENTION As described above, according to the present invention, a part of a plurality of bearings arranged on a holding base can be displaced with respect to the holding base, and the bearing can be displaced with respect to the holding base. By urging the possible bearings against the guide shaft by the spring force, it is possible to remove the existing between the guide shaft and the bearing with a compact structure without increasing the number of parts.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 (a) and 1 (b) are a plan view and a front view, respectively, showing the configuration of an embodiment of the present invention. 2 to 4 are schematic views showing the configuration of a conventional moving mechanism. 5,37 …… Optical card, 6,36 …… Holding stand, 14,15 …… Bearing, 16,17,38,39 …… Fixed shaft, 41 …… Spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic references Sho 59-15168 (JP, U) Suiko 53-48651 (JP, Y2) US Patent 3885132 (US, A)

Claims (1)

[Claims] 1. An optical information recording / reproducing apparatus for recording or reproducing information by moving a card-shaped optical information recording medium in a predetermined direction with respect to an optical head, and a holding table for holding the recording medium, and the holding device. A pair of guide shafts for guiding the table in the predetermined direction, a plurality of bearings arranged on the holding table for supporting the holding table with respect to the guide shafts, and a part of the plurality of bearings. And a biasing means mounted on the holding base for biasing the bearing toward the guide shaft by a spring force, and some of the plurality of bearings are displaceably supported with respect to the holding base. Has been done,
The remaining bearings are fixedly supported on the holding table,
The optical information recording / reproducing apparatus, wherein the biasing means biases the displaceably supported bearing toward the guide shaft.