JPS582833A - Optically reproducing sheet - Google Patents

Abstract

PURPOSE:To obtain the titled sheet reproducing high density information with accuracy by mixing a transparent plastic material with a specified bis(diiminosuccinonitrilo) metallic complex and exposing the resulting sheetlike material to X-rays or the like. CONSTITUTION:A transparent plastic material such as polystyrene is metled and kneaded with a bis(diiminosuccinonitrilo) metallic complex represented by the formula (where M is Ni, Pd, Pt or Co). The complex loses its peculiar light absorbency when irradiated with ultraviolet rays, electron beams or X-rays. The kneaded material is molded in the form of a film or a sheet. The filmlike or sheetlike material is exposed to ultraviolet rays, electron beams or X-rays through a photomask having a desired pattern to form a pattern with a difference in light absorbency peculiar to the metallic complex. The pattern is irradiated with spot beams of laser, and by detecting the quantity of transmitted beams, the record is read out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to optical recording sheets such as so-called optical discs that are read using laser light, and particularly to optical recording sheets that are highly productive and can accurately reproduce high-density information. Concerning reproduction sheets.

In recent years, recording and playback of information such as images and sounds has become increasingly important.
There is an increasingly strong demand for high-speed, high-density, and simple processing, and six methods have been proposed and some of them have been put into practical use.

Among these, optical recording sheets, such as so-called optical disks, which use laser light to read recorded signals, can record information at extremely high density, and can quickly retrieve desired recorded information from any location. Since it can be read out, it is expected that it will be widely put into practical use.

A typical recording and reading system for conventional optical discs records information by forming fine pits on the surface of a light-transmissive plastic, and a reflective layer is formed by metal vapor deposition on the surface where the fine bits are formed. 1. ``This is a method in which changes in the amount of reflected light due to light diffraction at the throat edge are detected using a photodiode, etc., and converted into an electrical signal to read out the recorded information.

However, to reproduce the optical discs used in this method, it is necessary to manufacture a stamper through a complicated process, and an expensive molding machine is required to transfer the narrow pits carved into the stamper. In addition, in order to enable the transfer of pits, the selection of plastic materials for the base material is extremely limited, and the durability of the resulting discs is often poor, resulting in defects such as warping and twisting. Furthermore, there is a drawback in accurate reproducibility of recording due to non-uniformity of bit transfer during molding. In addition, the life of the stamper is shortened due to contamination such as clogging of the bits, and a significant improvement in productivity is desired in the production of conventional optical duplication disks.

The present invention has the advantage of achieving high recording density and ease of reading data, which are the characteristics of conventional optical discs.
It is also an object of the present invention to provide an optical duplication disk which improves the above-mentioned unproductiveness of conventional optical disks during duplication and is capable of accurately reproducing recordings.

That is, the present invention provides a film-like or A sheet-like material is exposed to ultraviolet rays, electron beams, or X-rays through a photomask having a desired pattern to produce a bis(diiminosac) sheet.

That is, the optical reproduction sheet of the present invention is completely different from conventional sheets that use fine irregularities formed by injection molding or pressure molding as a memory, and the optical reproduction sheet of the present invention is completely different from conventional sheets that use fine irregularities formed by injection molding or pressure molding as a memory. The complex is ultraviolet rays, X#! Alternatively, it is an optical reproduction sheet that uses a pattern obtained by utilizing the property that its characteristic light absorption ability decreases or disappears when irradiated with an electron beam as a memory, and has a perfectly clear surface.

In the optical duplication sheet of the present invention, the photoduplex duplication sheet is transparent when exposed to laser light, and the amount of transmitted light of the laser beam irradiated onto the sheet is detected, and the amount of reflected light is detected and recorded. The metal complex has the following general formula (
It is a compound represented by T), and represents cobalt) inorganic chemistry (
Inorganic, Chemistry)
Volume 14, pages 640-645 (1975)
Bis(diiminosuccinonitrile), nickel, bis(diiminosuccinonitrile) can be synthesized by the method described in Preferably, nickel (sinonitrilo) is used.

The above bis(diiminosuccinonitrilo) metal collar body is 6
It has extremely strong absorption in the range 50 to 111-50n, but ultraviolet rays,
Irradiation with X-rays or electron beams reduces or eliminates the above-mentioned absorption ability.

Examples of plastic materials that serve as the binder component of the above-mentioned bis(diiminosuccinonitrilo) metal complex include methacrylic resins represented by polymethyl methacrylate (
Various known transparent plastics can be used, such as methacrylic copolymer resin), vinyl chloride resin, polystyrene resin, acrylonitrile styrene copolymer resin, polyester resin, polycarbonate resin, and cellulose acetate butyrate resin. In manufacturing the optical reproduction sheet of the present invention, a bis(diiminosuccinonitrilo) metal complex is kneaded with a plastic material serving as a binder component under temperature conditions where the plastic melts.
Use it in sheet or film form, or use the above screws (
The diiminosuccinonitrilo) metal complex and the plastic material can be dissolved in an organic solvent. When the bis(diiminosuccinonitrilo) metal complex is melt-kneaded with a plastic material and then molded into a notebook or film, or when a transparent plastic sheet or film is used as a transparent support, the plastic material is A material with low birefringence and excellent optical uniformity is preferred, and from this point of view, methacrylic resin is particularly preferred.

In addition to the above-mentioned plastic paulownia materials, commonly used transparent paint resins such as alkyd resins, epoxy resins, polyurethane resins, and modified cellulose resins are preferably used as binders when applied by dissolving them in a solvent. The binder may be used by adding a crosslinking agent of these resins and applying the resin to a support and then heating and drying to heat cure the binder layer.

Also, a plastic material having a bis(diiminosuccinonitrilo) metal complex moiety may be used at least partially.゛The mixing ratio of the bis(diiminosuccinonitrillo) metal complex or the same part and the transparent silk material which becomes one layer of the binder is determined based on the thickness of the layer containing the bis(diiminosuccinonitrillo) metal complex or the same part. It is selected as appropriate depending on the situation, but when melt-kneading with solid plastics and molding into a sheet or film, it is usually 0.02 to 2.0% by weight,
When forming a bis(white minosuccinonitrillo) metal complex or a layer containing the same by coating, it is common to contain the bis(diiminosuccinonitrillo) metal complex in an amount of 05 to 20% by weight.

Next, on the sheet having the bis(diiminosuccinonitrilo) metal complex obtained as described above or a layer containing the same moiety, desired notations are applied to the bis(diiminosuccinonitrilo) metal complex's unique light absorption ability. form a pattern of strength and weakness.

As a photomask, exposure,
It is sufficient as long as the difference in the unexposed area can be clearly seen, and it is generally made in the same way as a photomask used for semiconductor processing, and the substrate is made of soda lime, white crown, aluminoborosilicate, quartz, etc. A photomask using silver emulsion, chromium, chromium-chromium oxide, iron oxide, etc. as a non-transparent layer is usually used.

Accordingly, the transmittance of the laser beam used for reading the exposed and unexposed areas is selected as appropriate so that the transmittance is clearly different.
Generally, by weakening the laser beam for 1 second to 1 minute, the transmittance of the laser beam used to read and scan the photomask area and unexposed area absorbs noise such as uneven sheet thickness, making it clearer. It is fine as long as it gives a pulse-like signal, but generally the transmittance of the laser beam in the exposed area is at least twice that of the unexposed area, preferably at least 5 times,
Particularly preferably, it is 10 times or more.

The optical reproduction sheet of the present invention can be put to practical use as a transmission-type optical reproduction sheet that detects the amount of transmitted laser light on a non-irradiated surface when reading information recorded in its original form. Metal evaporation is performed on one side by a known method such as vacuum evaporation, sputtering, ion blasting, etc., and the metal is irradiated with a laser beam. However, in either case, reading is still performed based on the intensity of absorption of the laser beam when the laser beam passes through the bis(diiminosuccinonitrilo) metal complex or a layer containing the same.

In the above reproduction sheet, when the layer containing the above bis(diiminosuccinonitrilo) metal complex or the same portion is coated on a transparent support, ultraviolet rays and electron It is preferable to form a pattern by exposing to radiation or Particularly preferred is through the body layers.

In addition, in the case of a reflective optical reproduction sheet having a reflective layer, a protective coating may be applied to protect the reflective layer, or a backing process may be performed by pasting the plastic together.
It is also possible to form a double-sided plate by gluing two reflective optical reproduction sheets together on their reflective layer surfaces.

To read the optical reproduction sheet of the present invention, it is preferable to use a laser beam with an oscillation wavelength close to the maximum absorption of the contained bis5'<minosuccinonitrillo) metal complex, but various semiconductor lasers, helium neon lasers, etc. is usually used, and the beam is focused by a lens into a spot beam of usually 2μ or less and irradiated onto the sheet.

The amount of transmitted light or reflected light of the laser beam irradiated on the optical duplication sheet of the present invention is detected by a light receiving element such as a photodiode, and is converted into an electric signal, which is then used to reproduce various recorded information such as images and sounds. used for.

It is possible to perform high-density recording accurately, and the image and sound quality of reproduced recordings are also extremely good. The most typical shape of the optical reproduction sheet of the present invention is a disk, but it can be made into any shape such as a rectangle, an elongated shape, or a curved surface, if necessary.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the Examples.

Example 1 10 parts by weight of bis(diiminosuccinonitrilo)nickel (maximum absorption wavelength [hereinafter referred to as λmax] 670 nm) and 100 parts by weight of methyl methacrylate and n-butyl methacrylate copolymer resin were mixed with 100 parts of dichloromethane and methyl ethyl ketone. It was dissolved in 100 parts by weight of a mixed solvent and applied to one side of a 1.2 mm thick methacrylic resin plate so that a dry coating film had a thickness of 15 μm, and was dried at 80° C. for 30 minutes to remove the solvent. Next, a photomask made of chromium as a non-transmissive layer on soda lime glass was closely attached to the surface of the coating layer, and a photomask of 120W/W! The film was exposed to ultraviolet light for SO seconds under a high-pressure mercury lamp having an output of 100 mL to transfer the pattern of the photomask, thereby obtaining a transmission type optical reproduction sheet of the present invention.

The above replication sheet was cut out into a disk shape, and a spot beam of helium or neon laser light (oscillation wavelength: 635 nm) was irradiated onto the combined replication disks (on the coated layer side) to rotate the disk at a constant speed. As a result of trying to reproduce images by rotating the disk and detecting the transmitted laser light with a photodiode installed on the back side of the disk and converting it into an electrical signal, we were able to reproduce an extremely high-quality image.

Example 2 A reflective layer was formed on the coated layer surface of the replication sheet obtained in Example 1 by vapor deposition of aluminum, and an acrylic lacquer paint was further applied to protect the reflective layer. A formula reproduction sheet was obtained.

The above-mentioned replication sheet is cut out into a disk shape, and a helium neon laser beam (oscillation wavelength 655
ntn ) spot beam at an angle of 45°,
As a result of attempting to reproduce an image by rotating a disc at a constant speed and detecting the amount of reflected laser light with a photodiode and converting it into an electrical signal, they were able to reproduce an extremely high-quality image.

Note that a portion of the duplicated sheet obtained in Example 1 was exposed in the same manner as in Example 1 through the same soda lime glass, and the transmission of the laser beam used in Example 1 was observed between the sheet and the unexposed sheet. The light 1 ratio was 8/1.

patent applicant Mitsui Toatsu Chemical Co., Ltd. 17

Claims (1)

[Scope of Claims] Biscuits that lose their characteristic light absorption ability when irradiated with ultraviolet rays, electron beams, or X-rays (by exposing them to ultraviolet rays, electron beams, or (An optical duplication sheet that is diiminosaurable. °2) The pattern is read out through the transmission of laser light.-6) A reflective layer is provided on one side, and the pattern is read out based on the amount of reflected laser light.Claim 1 optical reproduction sheet.