JPS5897142A - Optical recorder and reproducer - Google Patents

Abstract

PURPOSE:To attain optical recording and reproduction with high density, by reproducing a multitrack signal recorded on a film for the transparent and opaque part with a photoconductive sensor array of multitrack incorporating a photoconductive cell and a switch array. CONSTITUTION:A photo sensor array 8 consists of a shift register 1, an address switch 4, and a photodiode 3, and the photodiode 3 is scanned with a scanning pulse generated at each stage of the shift register 1. As a reproduction optical system, a light emitting element 5 is arranged at the focus of an optical lens 6, a light made parallel with the lens 6 is irradiated on a tape 7 and the signal recorded on the tape 7 transparent and opaque parts is read at an optical sensor array 8. Thus, the scattering of the light passing through the transparent part is less and the S/N can not almost be deteriorated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reproducing head for an optical recording/reproducing device.

Optical talkie is an optical recorder system.

This records an analog signal in the audio band with a density of approximately 1111IIlliI on one side of the projection film.
Changes in the amount of transmitted light are reproduced using photocells.

However, in this method, the f# wavelength is less than 100 μm and the track width is 1 m%! The recording density is approximately 6 people btt/tncA! It is.

-In the field of magnetic recording, high-density recording technology has advanced by far.) The recording density for VTRs is only 20 Mb.
l t /1vLcl m is coming into practical use.

However, in magnetic recording, when the wavelength is less than 1 μm, the loss due to the spacing between the head and the magnetic tape becomes extremely large, making it difficult to put it into practical use.

It is well known that the optical reproducing method is advantageous for reproducing short wavelengths because the loss due to the spacing between the recording medium and the reproducing head is extremely small, and recently a reproducing method using laser light is about to be put into practical use. There is.

However, this reproduction method requires an expensive laser generator, making multi-track recording difficult and is mainly considered for disks.

When considering self-recording, there is no denying the superiority of tapes, which record in six dimensions compared to disks, which record on a surface (two-dimensional) K. There was a great need for a recording and reproducing device capable of reproducing data. For recording on a tape with a narrow track width, there are two methods: helical scanning using a rotating head system and multi-track recording using a fixed head system.

The multi-trunk system is advantageous due to its simple mechanism and recent remarkable advances in semiconductor technology.

For these reasons, it is desired to realize an optical multi-track reproducing head.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical multi-trunk playback head in a novel manner that eliminates the drawbacks of the prior art described above.

The present invention forms a reproducing head for a high-density optical recording/reproducing device by integrally forming a dedicated ultra-small light cell and an intere array, and by making it multi-track.

The present invention will be explained in detail below. First, in the present invention, an optical sensor array is defined as an array in which a photoelectric conversion function, a switching function for each pixel, and a scanning function are integrated on the same silicon substrate.

The scanning method uses the shift register of MUS, and the method used for L'C,'D Y is 10 in the embodiment.
The S method was adopted.

Figure #41 shows the circuit configuration of the optical sensor array used in the present invention. The optical sensor array consists of a shift register 1, an address switch 4 and a photodiode 5.

The photodiode 3 is scanned by scanning pulses generated at each stage of the shift register 1, and both the shift register 1 and the photodiode 5 can be manufactured by a MOS process.

The photodiode pitch was 6 μm.

The number of tracks is determined by the width of the tape used.

If the tape width is 1/4" (635) and the central part is 6", it will be 2000) racks.As for the number of tracks, one-way 2000) rank, round trip 1000 tracks x 2.iTh or more may be used.

The (3) ridge of the photodiode light receiving area is 2μm×
If the wavelength is 2 μm, a signal recorded with a wavelength of 2 μm can be reproduced.

Next, as a reproducing optical system, the configuration shown in FIG. 2 may be used. The light-emitting crystal 5 is arranged at the focal point position of the optical lens 60. The light-emitting cord may be anything that generates light with a wavelength that can be detected by a photodiode, such as an incandescent lamp or a light-emitting diode. Optical lens 6tfCL irradiates Qigu with parallel light, and optical sensor array 8 reads signals recorded on the tape in transparent and opaque forms. .

When a signal that has been magnetically recorded on a tape is reproduced by a so-called magnetic head, the reading and v loss are short wavelengths (several 4 yyc).
In general, -54,5・
It can be expressed as -ctB. Even if λ and λ are d==0.1 μ in the case of wavelength λ-1sm, the loss is 5.4 dB. A feature of the present invention is that there is no spacing loss in the short wavelength region. As shown in FIG. 4, the incident light 9 incident as a parallel ray is i! Diameter 2μm
It passes through the transparent part of , and the transmitted light is 1°, but the scattering of this light is small and if the spacing d is about 1 μm, #
There is almost no deterioration of S/1v. This contributes to the simplification of the tape running system, and even in the case of a track width of 2 μm, it becomes possible to perform tracking by controlling the head or tape position. Due to these synergistic effects, 160
Mblt / in<A! tape decks with recording densities of . This is a magnetic recording density of 20 Mblt.
/ It far exceeds 1v7h1.

[Brief explanation of the drawing]

Figure 1 shows a single-way configuration of the optical sensor array, Figure 2 shows the reproduction optical system, Figure 3 shows the arrangement of the recording tape and optical sensor array, and Figure 4 shows the spacing loss. Out. 1: Shift register 2: Output element 3: 7 phototer diode 4 Near address switch 5: Source operator 6: Optical lens 7: Note ft tape
8: Optical sensor array 9 Two-person radiation 1o:
Transparent Light Agent Patent Attorney Usui 1) Ori Shinsai 1 Figure 2 ``I (z Figure 23 Figure

Claims (1)

[Claims] 1. An optical recording and reproducing device that reproduces multi-trunk signals recorded transparently and opaquely on a film using a multi-track photoconductive sensor array.