JPS6353726A - Optical reproducing device and optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain recording or reproduction with high density, by reproducing a circular arc shaped recording locus formed on the recording medium of a rotary optical head being rotated setting an axis vertical to the recording plane of a tape shape, or a sheet shape, or a plate shape optical recording medium, as a rotary shaft, in a state without being brought into contact in order. CONSTITUTION:In the optical recording medium 4, a medium suitable for optical recording such as a material having phase change by heating, or the optical recording medium in which Curie point recording is utilized, is formed in a thin film shape on a tape, or a sheet. At time of recording, a laser light source 5 is modulated by a signal, and the circular arc shaped recording locus 13 is formed sequentially on the recording medium. At time of reproduction, the power of the laser light source 5 is weakened less than the power in a recording time, and traces on the recording locus through a similar path. At this time, the level, or the polarizing plane of reflected light from the recording medium, is varied, and the reflected light passes through a half mirror 7, and a lens 11, and a reproducing signal can be taken out by a photodetector 12. In this way, since the recording plane can be fed without being brought into contact even with a tape guide, deterioration in the recording plane is prevented from occurring, and a device can endure in repeated use for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a method for optically recording information signals such as audio signals, video signals, or digital data on a tape-shaped, sheet-shaped, or plate-shaped optical recording medium in a non-contact manner. Related to recording or playback devices.

The most popular conventional recording and reproducing device is a magnetic tape recorder that uses a magnetic tape and a magnetic head, but in order to achieve high-density recording, it is necessary to run the magnetic head and tape in contact with each other. However, there are problems with the deterioration and lifespan of the medium and head, and there is also a limit to the recording density. Optical recording using laser light is a means of high-density recording using one-way valve contact, but the optical recording method that is currently in practical use uses a rotating disk, but it naturally has a limited recording capacity and cannot be used for long periods of time. This is insufficient for digitally recording video signals. Therefore, a method of recording for a long time using an optical recording tape-like medium may be considered.As such a method, a method as shown in Japanese Patent Application Laid-open No. 1580Q4 of 1980 has been proposed, but this method does not The recording surface of the optical tape must be wound diagonally around a cylindrical tape guide and run in contact with it, and it is not easy to run an optical recording tape that has an extremely mirror-like finish. This deteriorates the recording surface of the recording medium.

Problems to be Solved by the Invention Magnetic recording media have conventionally been used in video tape recorders, data recorders, etc., but in the case of magnetic recording, the magnetic head and tape are in contact with each other for scanning. This is necessary when performing density recording, and there are problems in terms of the lifespan of the recording medium, the lifespan of the magnetic head, and the occurrence of belly button clogging. Furthermore, in helical scan video tape recorders, it is necessary to wrap the magnetic tape around a rotating head cylinder at an angle of 180 to 360 degrees. There are problems with tape life due to fatigue.

The present invention provides an apparatus that can optically perform high-density recording or reproduction without contact by using an optical tape-like (or sheet-like) recording medium and an optical rotating head.

Means for Solving the Problems The present invention provides an optical reproducing apparatus and an optical reproducing apparatus having a rotary optical head that rotates about an axis perpendicular to the recording surface of a tape-, sheet-, or plate-shaped optical recording medium. It is a recording and reproducing device.

Operation By recording and reproducing by the above-mentioned means, the optical recording surface of the recording medium can be used not only by the optical rotating head but also by
Since recording and playback can be performed without contacting guides that restrict the movement and running of the recording medium, the recording surface of the optical recording medium can withstand extremely long periods of use without deteriorating. .

In addition, since the optical rotating head is mounted on a rotating cylinder, the scanning speed is stabilized due to rotational inertia, and the scanning speed can be increased by increasing the number of rotations of the rotating cylinder or increasing the diameter of the rotating cylinder. scanning can be realized.

Example The present invention will be explained below according to specific examples.

FIG. 1 is a block diagram showing a first embodiment of the present invention; FIG. 1 is a cross-sectional view of the person as seen from the side, and FIG. 1st
In the figure, reference numeral 1 denotes a rotating head cylinder on which an optical head is mounted, and is rotated at a constant speed by a motor 2 and a shaft 3. 4 is a tape or sheet-like optical recording medium;
For example, materials that undergo a phase change due to heat, such as TaO2,
This is a recording medium in which a medium suitable for optical recording, such as a magneto-optical recording material that utilizes Curie point recording, is formed into a thin film on a tape or sheet. (In some cases, the recording medium 4 may be a hard plate-like medium instead of a flexible medium.) The recording medium 4 is arranged and transported within a plane perpendicular to the rotation axis of the rotary cylinder 1. 6 is a laser light source made of, for example, a semiconductor laser; 6 is a lens for converting the laser light source into a molecular beam; 7 is a half mirror 18
, 9 is a reflecting mirror for reflecting the laser beam guided through the central cavity of the motor shaft, and 1o is a recording medium 4.
This is a lens that focuses upwards.

During recording, the laser light source 6 is modulated by a signal to sequentially form arc-shaped recording loci 13 on the recording medium. During reproduction, the power of the laser light source 5 is made weaker than during recording, and the recorded trajectory is traced along a similar path. At this time, the level or polarization plane of the reflected light from the recording medium changes depending on the recording signal, and this reflected light is transferred to the half mirror 7,
A reproduced signal can be extracted by the light receiving element 12 through the entire lens 11. In this case, it is desirable that the recording medium 4 be perpendicular to the rotating shaft 3 of the cylinder, but it does not need to be perpendicular to the entire bottom surface of the cylinder, and only the area near the point P where the recording beam hits needs to be perpendicular. 4-
Other parts, such as 4', may deviate from the vertical plane.

Furthermore, in the case of Fig. 1, the optical head cannot record over the entire circumference, and the recording laser beam is emitted only during the period when the optical head is within a desired rotation angle range, and recording is performed only within that rotation angle range. However, even if the recording signal is a continuous signal, it is possible to record it seamlessly by performing time compression signal processing using a memory circuit.

Note that 5.6.7 and 11.12 are not displayed on the plan view B.

FIG. 2 shows a second embodiment of the invention. Second
In the figure, parts with the same functions as those in FIG. 1 are designated by the same numbers. The difference from FIG. 1 is that, while FIG. 1 had one optical head, the specific example in FIG. 2 has two optical heads. 14 is a half mirror, part of the light from the light source 6 is sent to the reflecting mirror 9, and the pond part is sent to the reflecting mirror 15.
guided by. The light reflected by the recording medium 15 is focused on the surface of the recording medium when it rotates around the point P through the reflecting mirror 16 and the lens 17. Furthermore, in FIG. 2, a light shielding plate 18 is provided to prevent recording on the left half of the diagram. Instead of this light shielding plate 18, a method may be adopted in which light shielding shutters are inserted between 15-16, 14-9, etc. depending on the rotation angle.

In FIG. 2, the case with two optical heads has been explained as an example, but by extending the idea of FIG.

FIG. 3 shows another specific embodiment of the present invention. The difference in FIG. 3 from the examples shown in FIGS. 1 and 2 is that the light source and the light receiving element are contained within a rotating cylinder in the example shown in FIG.

Elements having the same function as in FIGS. 1 and 2 are designated with the same number or with a dash added to the same number. 6' is a laser light source, 6' is a lens, 7' is a half mirror, 19' is a reflecting mirror, 10' and 11' are lenses, and 12' is a light receiving element. Signals are exchanged between the rotating part and the fixed part by rotation. This is done using a slip ring and a brush 19 provided on the shaft. Other methods for transmitting and receiving signals and power between the rotating part and the fixed part include a method using a rotary transformer and a method of optical transmitting and receiving.

FIGS. 4 and 5 show means for changing the optical path for tracking during reproduction.

Figure 4 shows a solenoid 22 fixed to a rotating cylinder.
and an optical head unit 20 in which a reflector 9 lens 10 is housed integrally are located inside the rotating cylinder 1,
The shaft 23 of the optical head unit 20 serves as a moving shaft for a solenoid, and the optical unit 20 is configured to move in the left-right direction in response to a control signal.

With this configuration, the window 2 of the optical head unit) 20
The light introduced from 1 is shifted left and right on the recording medium, and can be tracked during reproduction according to a control signal.

In FIG. 5, a reflecting mirror 9 provided inside a rotary head cylinder 1 is attached so as to be movable around a fulcrum 25, a piezoelectric element 24 is attached to the other end, and the piezoelectric element is deflected by a control signal to change the optical path. Tracking during playback is achieved by slightly changing the tilt. Figure 5B
is used to explain the part of the reflecting mirror 9 in an easy-to-understand manner. 9 is a reflecting mirror, 24 is a piezoelectric element, one end is fixed to a reflecting mirror, the other end is fixed to a cylinder, and the reflecting mirror is movable around a fulcrum 25. The state of affairs has been taken into account.

FIG. 5 shows a tape running system for running the tape perpendicularly to the cylinder rotation axis, and the tape is run while maintaining the flatness of the section where the recording locus is formed by tape guide rollers 26 and 27.

As for the method of obtaining the tracking signal, a known method such as that disclosed in Japanese Patent Application Laid-Open No. 154304/1984 can be used.

The focusing of the light spot on the recording medium can also be achieved by mechanical adjustment, but it can also be achieved by a known method such as that disclosed in Japanese Patent Application Laid-Open No. 50-39561. .

Effects of the Invention By using the method of the present invention, signals can be recorded on an optical recording medium without contact, and the recording surface can be run without coming into contact with the tape guide, thereby preventing deterioration of the recording surface. Therefore, it is possible to realize a recording/reproducing device that can withstand repeated use for an extremely long period of time without causing any problems.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining one embodiment of the optical recording device of the present invention, and FIG. 2 is a block diagram for explaining another embodiment of the second optical recording/reproducing device of the present invention. , FIG. 3 is a block diagram for explaining another embodiment of the present invention, FIGS. 4 and 5 are block diagrams for explaining optical path variable means for tracking during reproduction, and FIG. FIG. 2 is a configuration diagram illustrating a means for moving a shaped or sheet-like medium perpendicularly to a cylinder rotation axis. 1...Rotating head cylinder, 2...
Motor, 3... Shaft, 4... Optical recording medium, 6... Laser light source, 6, 10,
11.17...Lens, 7.14...
Half mirrors 18, 9, 15, 16... Reflecting mirror, 12... Light receiving element, 13... Recording locus. Name of agent: Patent attorney Toshi Nakao and one other person Boo ■■ Suction head cylinder? -Motor 3-Material 4-Dog lantern rough j〉Arrival 5-Ray dimension 6-1/Response ゛goo-Half mirror-g, q-, i6 total 1 10.77-Lance' 1st Figure 12 - Cheer 3 - Animal ζ Kurisuke 74 - Half mirror 75, 7b - Funeral Pier etc. Figure 3

Claims (8)

[Claims] (1) A rotary optical head that rotates around an axis perpendicular to the recording surface of a tape-, sheet-, or plate-shaped optical recording medium sequentially records an arcuate recording trajectory formed on the recording medium. An optical playback device characterized by playback in a non-contact state. (2) A laser light source is provided outside the rotary cylinder, and the laser light is guided to the rotary optical head through a cavity provided at the center of the rotation axis of the rotary cylinder. Optical reproduction device. (3) The optical reproducing device according to claim 1, further comprising a rotary optical head that includes at least a laser light source and a light receiving element in a rotating cylinder. (4) The optical reproducing device according to claim 1, characterized in that it has a plurality of optical heads within a rotating cylinder. (5) A rotary optical head that rotates around an axis perpendicular to the recording surface of a tape-, sheet-, or plate-shaped optical recording medium records an arcuate recording trajectory on the recording medium in a non-contact manner. An optical recording and reproducing device characterized by recording and reproducing data in a sequential manner. (6) A laser light source is provided outside the rotary cylinder, and the laser light is guided to the rotary optical head through a cavity provided at the center of the rotation axis of the rotary cylinder. Optical recording and reproducing device. (7) The optical recording and reproducing apparatus according to claim 5, further comprising a rotary optical head that includes at least a laser light source and a light receiving element in a rotating cylinder. (8) The optical recording and reproducing device according to claim 5, characterized in that it has a plurality of optical heads within a rotating cylinder.