JPH01191376A - Optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the height of a whole device and to miniaturize the device by causing the weight of the moving means of an optical head and the placing table of an information recording medium to be equal and mutually executing a reciprocating motion in a reverse direction while balance in weight is held. CONSTITUTION:When an optical card C is loaded on a placing table 10, a start signal is sent from a card hold detecting means to a motor control circuit and a motor 22 is turned repeatedly and inversely with a prescribed period. According to this turn, a pinion 21 executes the same turn and a carriage 14, which loads the placing table 10 and an optical head 17, is displaced always only by a same distance in the reverse direction at a same speed. In such a case, by almost equalizing the total weight in the loading stand 10 side and the total weight in the carriage 14 side, the both mutually play the role of a balancing weight and a shock in an X-direction generated at the time of inverting operation is canceled. Then, normal record reproducing is maintained. Thus, the height of the whole device reduced and the device is constituted in compact.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical recording and reproducing method in which information is recorded and reproduced by relatively reciprocating a sheet-shaped or card-shaped optical information recording medium and an optical head. It is related to the device.

[Prior Art] In a conventional optical recording/reproducing device, an optical head has means for moving in the so-called theta direction, which is perpendicular to the reciprocating direction of the optical information recording medium, and the optical information recording medium is It is held on a mounting table and reciprocates in the direction of a tracking tracker 7 provided on the recording medium.

This configuration will be explained with reference to a conventional example shown in FIG. 3. The mounting table l is supported by card feeding guides 2a and 2b and is movable in the X direction. A mounting table 1 holds an optical card C, and is fixed to a straight portion of a belt 4 together with a counterweight 3 having a weight approximately equal to the total weight of the mounting table L and the optical card C. 1 and the balance weight 3 are arranged to perform linear motion in opposite directions. The drive pulley 5 repeats reversal at regular intervals, and the mounting table 1 performs reciprocating linear motion within the range of the linear portion of the belt 4.

An optical heald 7 provided above the mounting table 1 is supported by a feed screw rod 8 and a head feed guide 9 and can be driven in the Y direction, and is controlled so that recording and reproduction can be performed at a desired position. . In addition, the objective lens 7 in the optical head 7
The portion including a can be driven in both the focus and track directions to follow fluctuations that occur in the focus direction, that is, the X direction, and in the track direction, that is, the Y direction, and is always controlled to an optimal position.

Equilibrium S! If the optical card C is reciprocated at high speed without attaching the belt 4, the impact generated when the mounting table 1 is reversed will be transferred to the belt 4.
, is transmitted to the chassis via the pulleys 5 and 6, the drive shaft, the motor, etc., and is transmitted to the optical radar 7 via the feed screw rod 8 and the head feed guide 9. The part of the optical head 7 that includes the objective lens 7a is extremely sensitive to shocks, and if a shock that exceeds the holding force that restrains the position of the objective lens 7a is applied, the objective lens 7a will move. , the relative position with the pit P etc. on the optical card C is shifted, and the desired recording Φ reproduction becomes impossible.

On the other hand, when the balance weight 3 is attached, the shock that theoretically occurs in the X direction is canceled out, vibrations, etc. are suppressed within a predetermined range, and normal recording and reproduction can be maintained.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, the optical head 7, the mounting table 1. The belt 4 and the counterweight 3 have to be arranged in a hierarchical manner, which increases the height of the entire device and increases the size of the device.

[Object of the Invention] It is an object of the present invention to provide an optical recording/reproducing device which improves the drawbacks of the conventional example and can be constructed compactly with a low overall height.

[Summary of the Invention] The gist of the present invention for achieving the above-mentioned object is to place a card-shaped or sheet-shaped optical information recording medium on a mounting table, and to move the mounting table and an optical head unit relatively back and forth. In an optical recording and reproducing apparatus that records and/or reproduces information by moving the mounting base and the optical head section, means for making the mounting table and the optical head section have equal weights and moving them in opposite directions using power from the same driving source. This is an optical recording/reproducing device characterized by comprising:

[Embodiments of the Invention] The present invention will be explained in detail based on the embodiments shown in FIGS. 1 and 2.

1 is a sectional view, and FIG. 2 is a sectional view taken along the line II-II in FIG. It is supported so as to be able to slide in the X direction, and a rack 13 is engraved on its lower surface. On the other hand, a carriage 14 is provided below the mounting table 10, and like the mounting table 10, it is supported by feed guides 15a and 15b passed to the frame 11 in a slidable state in the A rack 16 is engraved.

Further, an optical heald 17 is arranged above the carriage 14, and a feed screw rod 18 attached to the carriage 14 is provided.
It is supported by a feed guide 19 so as to be movable in the direction of arrow Y. Further, a head motor 20 is attached to one end of the feed screw rod 18, and the drive force of this head motor 20 rotates the feed screw rod 18, so that the optical head 17 can move in the Y direction. ing. The rack 13 of the mounting table IO and the rack 16 of the carriage 14 are
They are meshed with a pinion gear 21 disposed between them in opposite directions around the axis, and when this pinion 21 is rotated by a motor 22, the mounting table 10 and the carriage 14 perform linear motion in mutually opposite directions. It looks like this. Furthermore, regarding the weight relationship of these components, the total weight of the optical card C1 mounting table 10 is approximately equal to the total weight of the optical disk 1f, feed thread 18, feed guide 19, head motor 20, and gear ridge 14. It has been adjusted as follows.

In the above configuration, when the optical card C is placed on the mounting table 10 by the optical card moving means (not shown), a start signal is sent to the motor control circuit by the card holding detection means, the motor control circuit is activated, and the motor 22 is activated. rotates repeatedly in the incoming direction at a predetermined period. According to the rotation, the binion 21 also rotates in the same way, and the mounting table 10 and the optical rack 17
The carriage 14 carrying the is always displaced in the opposite direction at the same speed and the same distance, and each time the head motor 20 repeats or reverses, the optical head 17 moves in the Y direction to record information on the optical card C. playback. At this time, since the total weight on the processing table 10 side and the total weight on the carriage 14 side are almost balanced, the two act as counterbalancing weights, and the impact in the X direction that occurs during the reversing operation is canceled out, causing vibrations. etc. are suppressed within a predetermined range, making it possible to maintain normal recording and reproduction.

In addition, in the embodiment, a combination of a rack and a pinion was used as a driving means for moving the mounting table 10 and the carriage 14 in opposite directions, but this may be any means that moves them in opposite directions at the same speed. For example, a belt
Similar effects can be obtained by using other means such as a crank mechanism.

[Effects of the Invention] As explained above, the optical recording/reproducing device according to the present invention makes the weight of the moving means for the optical head equal to the weight of the mounting table for the optical information recording medium, and maintains the weight balance while moving them in opposite directions. By reciprocating the optical head and the medium mounting table, the optical head moving means and the medium mounting table each serve as a counterweight, so there is no need to prepare a separate counterweight, and furthermore, the optical head and the medium move in opposite directions at the same time. Therefore, the moving distance necessary for recording and reproducing information is reduced to one half of that of the conventional example, making it possible to reduce the height and size of the entire device.

[Brief explanation of the drawing]

1 and 2 of the drawings show an embodiment of the optical recording/reproducing apparatus according to the present invention, FIG. 1 is a sectional view, and FIG. 2 is a cross-sectional view of FIG.
FIG. 3 is a sectional view taken along line -n, and FIG. 3 is a perspective view of a conventional example. Reference numeral 10 is a mounting table, 11 is a 7L/-m, L2a, 12b
, 15a, 15b, and 19 are feed guides, 14 is a carriage, 13.16 is a rack, 17 is an optical head, 18 is a feed screw, 20 is a herad motor, 21 is a pinion, 22 is a motor, and C is an optical card.

Claims (1)

[Claims] 1. An optical recording and reproducing device that places a card-shaped or sheet-shaped optical information recording medium on a mounting table and records and/or reproduces information by relatively reciprocating the mounting table and an optical head section. An optical recording and reproducing apparatus characterized in that the mounting table and the optical head section have equal weight and are provided with means for moving them in opposite directions using power from the same driving source.