JPS619872A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce danger of destruction while decreasing rotational numbers of each of a disk and a pickup without deteriorating characteristic of information reading by rotating the disk and pickup in the opposite direction. CONSTITUTION:Information recorded on the disk 10 is read by the pickup 9. Rotation of the shaft 12 of a motor 11 is transmitted to the shaft 14 through a belt 13 to rotate the pickup 9 in the direction of arrow marks 15. Rotation of the motor 11 is reversed by gears 16, 17, and the disk 10 is rotated in the direction of arrow marks 21 through a shaft 18, a belt 19 and a shaft 20. The pickup 9 and disk 10 rotate in the opposite direction, and rotational numbers can be halved, and centrifugal force is decreased to 1/4. Thus, a safety against destruction can be improved remarkably.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to an information recording medium (disc) in which information is recorded as a pit string that can be read as changes in the amount of reflected or transmitted light, or as changes in capacitance. , relates to an information recording/reproducing apparatus comprising a reading device thereof.

[Technical background of the invention and its problems]

This type of information recording/reproducing device has already been put into practical use as a video disc tube. FIG. 2 shows the basic configuration of this type of device.

In the figure, emitted light 3 from a semiconductor laser (hereinafter referred to as D) 2 mounted in a pickup 1 is irradiated onto a disk 4 on which information is recorded as a pit row, and reflected light whose intensity is modulated depending on the presence or absence of pits. is incident on photodiodes (hereinafter referred to as P and D) by the beam splitter 5, and the information on the disk is converted into an electrical signal. Further, in order to sequentially read the pit rows, the disk is rotated by a motor 7. In general, in an optical video disc system, one time [i number constant] (CAV) is 1800 r, p
, m, constant linear velocity (CLv) is 1800~6
00r, p, m, 900 r for VH'D system
,p,m,,In the CED system, 45Qr,p,
In the digital audio disc (DAD) system, the number is 200 to 500r,p,m,.

That is, widening the band of recorded information can be easily achieved by increasing the number of rotations. On the other hand, there are other methods in which the recording pit rows may be made smaller, but the technical difficulty is significantly different from that described above. However, increasing the number of rotations increases the risk of breakage. In other words, as the number of revolutions increases, the centrifugal force increases as the square of the speed, which causes the disk to break. Safety is an important issue, especially in consumer devices such as video discs.

[Purpose of the invention]

An object of the present invention is to provide an information recording and reproducing apparatus that reduces such risks and does not deteriorate the customization of information reading.

[Summary of the Invention] In other words, the present invention rotates the disk and the pickup in opposite directions, thereby maintaining the relative speed between the pickup and the disk so that desired characteristics can be obtained. Since the number of rotations of each pickup is reduced, the risk of destruction is reduced.

[Embodiments of the invention]

An embodiment of the present invention is shown in FIG. The function of reading the information recorded on the disk 10 by the pickup 9 is as follows.
This is similar to the conventional example, but at this time, the pickup 9 and the disk 10 are rotating in opposite directions. That is, motor 1
The rotation of the shaft 12 of the pickup 1 is transmitted to the shaft 14 via the belt 13, thereby causing the pickup 9 to rotate in the direction of the arrow 15. On the other hand, the rotation of the motor 11 is reversed by the gears 16, 17, and the shaft 18. Belt 19. The disk 10 is rotated in the direction of an arrow 21 via a shaft 20. For example, in the past, in order to obtain the characteristics of new pickles, it was necessary to use a disk of 180 Or, p, m, but according to the present invention, in order to obtain the same characteristics, it was necessary to use a disk of 9 Q Q.
r, p, m, pickup should be 90 Or, p-ms, and since the rotation speed of the disk is halved at this time,
The centrifugal force is reduced by 1/4 J, and safety against destruction is greatly improved.

Further, the ratio of the rotational speeds of the disk and the pickup may be arbitrarily set to 19q, taking into consideration the strength against destruction. Note that the means for rotating the disk and the picker knob in opposite directions is not limited to that of the embodiment.

〔Effect of the invention〕

Therefore, according to the present invention, the safety against disk destruction can be improved without deteriorating the information reading characteristics.

[Brief explanation of the drawing]

31 is a diagram showing the appearance of a video disc according to an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional video disc device. 1.9...Pickup, 2...Semiconductor laser, 3
... Shi~The Beam, 4.10... Disc, 5...
Beam splitter, 6... Photo diode, 7° 11... Motor, 8, 15. 21... Rotation direction, 12
゜1, 4, 18, 20...axis, 13.19...
Belt, ]6°17...gear. Representative Patent Attorney Kensuke Chika (and 1 other person) No. 1
figure

Claims (1)

[Claims] An information recording and reproducing apparatus comprising an information recording medium in which information is recorded as a pit string that can be read as changes in reflected or transmitted light or changes in capacitance, and a pickup for reading the information, the recording medium and the pickup An information recording/reproducing device characterized by rotating the .