JPH02117885A - Optical recording medium - Google Patents

Abstract

PURPOSE:To enable building-up of a recording layer and multiple recording to be performed easily by providing a light reflective or light-transmitting layer on a support, and using a coloring material as information bits. CONSTITUTION:Recording is conducted in a predetermined format by using a coloring material as a record group 1, and recording in a predetermined format is conducted by using a record group 2 comprising a coloring material with a color different from the color of the coloring material of the record group 1, in superposition on the record group 1, thereby obtaining a record group 3. If required, a record group 3 is further superposed by using coloring materials different in color from the above coloring materials, to obtain a recording medium. The recording medium thus produced is irradiated with light or the like, a reflected or transmitted light is discriminated on a record group basis by use of respective filters for the coloring materials, thereby performing a recording process. To read information from the recording medium, the medium 8 is irradiated with light, then the reflected light is obtained through a half mirror 5, color information contained in the reflected light is transmitted through the respective color filters 4, and record signals are read by a detector 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical recording medium having optically readable information bits.

[Conventional technology]

The method of recording information by optical reading is widely used.
Applied in industry. Typical examples include barcode systems that record product information, optical cards that have recently attracted attention as large-capacity memory cards, and optical discs that serve as music and video information memories. These manufacturing methods are cost, durability, reliability, safety,
The decision is made taking into consideration various conditions such as high density or high speed access.

That is, in barcode systems, a large emphasis is placed on cost, and since the amount of information is small, barcode systems are formed exclusively by printing methods. Optical cards and optical discs have a very high information density, so photolithography methods,
In other words, there are methods in which information bits are formed by batch exposure using a master mask, methods in which information bits are formed by irradiating a spot with a laser beam or the like to cause a state change in a part of the recording layer, and methods in which information bits are formed using a mold. A typical example is a method in which unevenness is created by pressing and used to form information bits.

In either method, optical contrast is obtained by using a light-absorbing substance or light scattering on the reflective layer, and information bits are formed by binarizing this.

On the other hand, various methods for forming fine colored images have been developed. These methods can be roughly divided into: (a) printing methods (letterpress, intaglio, planography, stencil printing, and modified printing methods thereof); (b) dyeing methods (natural protein awards are photocured with a photocrosslinking agent, and then (C) Vapor deposition method (method of vapor depositing R material etc. and etching after lift-off or masking of a pre-formed pattern); (d) Electrodeposition method (method of dyeing a pigment with an electric charge); , a method of plating a pre-formed electrode pattern), (e) a photolithography method (a method of photocuring a photosensitive resin containing a colored body), (f) a multilayer interference film method (a method of alternately depositing thin films with different refractive indexes) A method of layering multiple layers and etching them to form a pattern has been proposed, and has been applied to color filters for color separation of solid-state image sensors (tubes) and color filters for color LCD displays.

[Problems to be Solved by the Invention] In the recording medium according to the conventional method, since the method uses a binarization method using optical contrast, it is difficult to perform multiple recording within the same recording medium.

Furthermore, in order to increase the recording capacity on a limited plane, the size of the information bits must be reduced, which imposes manufacturing constraints.

The present invention solves the conventional problems (as a result of study), using colored bodies as information bits, utilizing the selective wavelength reflection or transmittance of light of each colored body, and multiple recording using conventional manufacturing technology. , the purpose is to enable large capacity.

[Means to solve the problem]

To this end, the optical recording medium of the present invention is characterized in that a light reflecting layer or a transmitting layer is formed on the support, and furthermore, a colored body is used as the information bit.

That is, as shown in FIG. 1, a recording group 1 is recorded in a predetermined format using a colored body, is superimposed on the recording group 1, and a recording group 2 consisting of a colored body of a different color from the colored body is used. and record in a predetermined format to obtain record group 3. Further, if necessary, a recording medium may be obtained by superimposing the recording group 3 with a colored body of a different color from the colored body in the same manner. Light, etc. is irradiated, and the reflected light and transmitted light are distinguished by recording group using filters for each colored body, and recording processing is performed.

Note that the "colored body" used in the present invention is a colored body obtained by dyes and pigments or multilayer interference films, etc., and the "different hues" are the colored bodies obtained by irradiating a light source and reflecting or absorbing the light. Coloring is defined as two or more respective hues that can be distinguished by a detection device. These colored bodies must have a sufficient S/N ratio with the support forming the light-reflecting layer or the transmitting layer, and unless each hue and their density are sufficient, a recording medium of great performance cannot be obtained.

Various devices can be considered for reading the recording medium of the present invention. - To give an example, there is a method of separating color information using a half mirror 5 and a color filter 4 as shown in FIG. That is, the light source 6 is made into parallel light by the lens 7, the light is further condensed by the lens 9 through the half mirror 5, the light is irradiated onto the recording medium 8 of the present invention, and the reflected light is obtained by the half mirror 5, and each color is Filter 4 transmits the color information, and detector 1
Read the recorded signal from 0. In this case, a light source including many wavelengths is adopted as the light source 6, and a color filter 4 is used on the detection side.
However, these are not limited to visible light; for example, there is also a method in which the recording medium 8 is made of a fluorescent material and the light source 6 is an ultraviolet light source.

There is also a method of reading using multiple light sources and multiple detectors without using a half mirror.

As a manufacturing method, a conventional method of forming a colored image can be used. In other words, it can be formed with high precision by a printing method, a dyeing method, or the like. Specifically, this will be explained in detail in Examples.

[Function] According to the present invention, multiple recording is possible on the same recording medium, and furthermore, a large amount of information can be recorded by an easy method.

[Example 1] (Preparation of plate) A film pattern having predetermined information was vacuum-adhered to a PS plate (LKP-A manufactured by Fuji Pharmaceutical Co., Ltd.), exposed to light with a mercury lamp, and developed with a special developer.

After sufficiently removing the developer, gummy the riscoat gum,
A desired PS plate was obtained, and a film pattern having other information was created in the same manner as described above.

(Preparation of ink) Red and green inks consisting of rosin-modified phenol, pigment, etc. were prepared with the compositions shown in Table 1.

(Margins below) Table 1 Red ink, green ink Using the above plate and ink, printing was performed on white paper using an offset printing machine so that they weighed each other, and was dried with hot air.

This printed material was read using a barcode reader consisting of a red LED and a barcode reader consisting of a green LED. In barcode readers that use red LEDs, green ink information is displayed on the green LED.
The barcode reader configured with this was able to read information in red ink in good condition.

[Example 2] Aluminum film was formed to a thickness of 100 μm on a polycarbonate resin film, gelatin added with 10 wt% ammonium dichromate was applied thereon, prebaked at 70°C, and adhered with a photomask with information bits written on it. exposed,
Developed with hot water and cured at 150°C for 30 minutes.Then, dyed with a red dye solution, immersed in a 40°C tannic acid aqueous solution for 5 minutes, and dried at 150°C for 30 minutes to form a red information bit. did. In the same way, a green information bit aligned with the red information bit was formed.

On the other hand, a white rigid polyvinyl chloride resin film is cut into a predetermined size in the shape of a bank card, the desired printing is applied to the surface, a polycarbonate resin film having the above-mentioned information bits is pasted on the surface side, and a transparent Polycarbonate resin films were bonded together via an acrylic adhesive to form a surface protective film, and an optical recording card was prepared. still,
Table 2 shows the composition of each color dye bath.

Table 2 When the optical card of red dye bath green dye bath 2 was read using the apparatus shown in FIG. 2, good information on each color was obtained.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the amount of recording can be easily increased, and multiple recording can be easily performed. In particular, the latter effect makes the optical recording medium suitable for recording in non-Neumann-type parallel processing computers that process multiple data using one or more instructions, as opposed to the so-called von Neumann-type sequential processing currently seen in computers. It can be said.

[Brief explanation of drawings]

FIG. 1 shows an example of an optical recording medium of the invention, and FIG. 2 shows an example of an optical recording medium reading device of the invention. 1.2.3... Recording group, 4... Color filter, 5...
... Half mirror 16... Light source, 7.9... Lens, 8... Recording medium, 10... Detector. Applicant: Dai Nippon Printing Co., Ltd. Representative Patent Attorney Hiroki Shirai (5 others) Figure 1

Claims (2)

[Claims] (1) An optical recording medium characterized in that a light reflective layer or a transparent layer is formed on a support, and a colored body is further used as an information bit. (2) The optical recording medium according to claim 1, wherein the colored body is formed in at least two different hues.