JPH0324538A - Production of optical information recording body - Google Patents

Abstract

PURPOSE:To obtain an optical information recording body effectively usable as various licenses, an optical post card, etc., by forming an image on one side of a substrate with a transmissive original formed by dry thermal development and then forming a protective coating film on the image forming side of the substrate. CONSTITUTION:A transparent plastic film as a substrate is coated with a photothermographic medium prepd. by dispersing an org. silver salt or complex, a photocatalyst, a reducing agent and a sensitizer in a binder. The resulting graphic element is exposed with a light source and heated with a heat source. Silver formed by the reduction of the org. silver salt in the exposed part gives a block image, the exposed part is contrasted by the unexposed part and an image is formed. A protective coating layer is then formed only on the image forming side of the substrate. By this method, cards having the same information sent to many people can be formed in large quantities at a low cost.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for producing an optical information recording medium with excellent gradation. For more details, see the optical card. Private card.
Passport, various driver's licenses. The present invention provides a method for producing an optical information recording medium that can be effectively used for optical postcards and the like.

<Conventional technology and its issues> Conventional. Printing systems are widely used as a means of transmitting large amounts of various types of information. It is difficult to reproduce fine patterns, and the plate-making process is complicated because it is a wet process.

Thin film systems such as casings and U are also being considered in some areas.
There are problems with productivity and price, and the manufacturing process is complicated.

Ten thousand. Actinic radiation is applied in a pattern. It is also conceivable to use as a recording medium a base sheet having an image layer formed on at least one surface thereof by dry heat phenomenon treatment 1. This has problems in terms of mass production and price.

<Means for solving the problems> The present invention is as follows. A first step of forming an image on at least one surface of the substrate using a transparent original created by a dry heat development process; The present invention is characterized by a method for producing an optical information recording medium, which comprises a second step of forming at least a protective coating layer on the image-forming surface.

Example below. The present invention will be specifically explained by giving examples.

for example. For thermoplastic resins such as polyvinyl chloride and polyvinylidene chloride. Dissolve and mix photodegradable substances such as diazonium salts. Apply to the substrate base.

The substrate base is clear from the explanation below. When reading information using transmitted light. Polyester polycarbonate. It is composed of a transparent plastic film or sheet such as acrylic resin. Opaque plastic film or sheet when reading out using reflected light. or other substantially opaque film or sheet material.

on the other hand. The transparent manuscript is. It is created using a dry heat development process. , the treatment method is described, for example, in U.S. Pat. No. 3,152,900.
No. 4. Special Publication No. 43-4924. Special Public Service 53-5687
It is stated in the number etc. This processing method is. For example, on a transparent plastic film. The binder contains an organic silver salt complex. With photocatalyst. A graphic element coated with a photothermographic medium having a reducing agent and a sensitizer dispersed therein is exposed to light using a light source (including CRT and laser). 80℃ or higher after exposure. Good case〈is 1lO~1
By heating with a heat source at 35°C for 3-30 seconds. In the exposed areas, the silver produced by the reduction of organic silver salts has a black image and contrasts with the unexposed areas. An image is formed.

The image shape to the base is. Transparent originals are generally distinguished by whether they are negative type or positive type.

If the manuscript is a negative type. @Apply to the substrate base 1
- onto the surface coated with a mixture of thermoplastic resin and photodegradable substance.
Ultraviolet 1f with a transparent original! Atl-irradiation and exposure. The photodegradable substance is decomposed in the exposed area, and N2 gas is liberated in the photosensitive coating layer. Next, usually about lOO~130℃
By heating for about 0.5 seconds, the resin forming the photosensitive coating layer is softened, and the VcN2 gas is thermally expanded to form fine bubbles of 0.1 to 0.5 .mu.m. moreover. Irradiate the entire surface with ultraviolet light. Decomposes photodegradable substances in non-image areas. Then, by gradually removing the gas in the non-image area caused by decomposition. A visible image is formed by scattering the incident light of the microbubbles.

Also. If the manuscript is in original type. In addition to performing the exposure as described above. Heating (approximately 80℃ for approximately 10 seconds)
do. Removes N2 gas generated inside the photosensitive coating layer of the exposed area. Next, the entire area was irradiated with ultraviolet light. Decomposes undecomposed photodegradable substances.

Furthermore, in the same manner as described above, a positive image is fixed by heating at about 100 to 130 DEG C. for about 0.5 seconds and applying N2 gas through thermal FIE.

In this way, the image form or . The process of creating a transparent JJX image and the process of creating an image can be done without using any chemicals. This is because it is a dry method using heat and light. It's easy. Moreover, a product with high gradation can be obtained.

As mentioned above [. E. - Ammonia gas may be used instead of the heat source.

The part where the image is formed on the substrate is... It may be almost the entire surface of the base (or both surfaces in the case of a reflective type). It may be a part of the base.

Regarding this first step. On the substrate on which the image is formed. A second step of applying a protective coating layer is performed at least only on the image-forming surface.

The protective coating layer is. It is mainly formed to prevent damage to the recording surface, and is divided into light-transmitting types and non-light-transmitting types. The former is primarily used when the information does not require secrecy. The latter is mainly used when the information requires secrecy.

The protective coating layer of the light-transmitting type is. On the recorded information side (image side). A paint made from a solution of synthetic resin, which is a transparent, light-transmitting material. It can be formed by applying and hardening lacquer, etc. For example, use a transparent resin film or one side of the sheet. The shape may be formed by pasting an adhesive film provided with a transparent adhesive.

For light transmission type. It can be constructed from thermoreversible materials that are normally opaque and become transparent when heated. , the material is. For example, it is described in Japanese Patent Application Laid-Open No. 55-154198. Because the protective coating layer is normally opaque. For example, it is possible to prevent optical deterioration of recorded information. When reading information, the VC is heated to make the coating layer transparent.

The protective coating layer of the non-light transmitting type is. It is mainly useful when the information content is confidential. As mentioned above, it is also useful for preventing photodeterioration.

Light non-transparent type protective coating mFi. The coating material itself may be selected from light-opaque materials. on the surface (or back) or between layers of an element consisting essentially of a light-transmitting material. The element may be coated, coated, interposed, etc. with a light-opaque material, or the surface or interior of the element may be chemically or physically treated to render it light-opaque.

The protective coating layer of the non-light transmitting type is. It is preferable that the information storage surface can be removed without damaging it. After peeling it off. Although it is not necessarily necessary to be able to re-clear the MRI. If it is a reattachable type, it may be one that can be reattached. The adhesive surface can be composed of a removable adhesive, and the adhesive is usually a 0.3% adhesive mainly composed of rubber and/or resin that has pressure-sensitive adhesive properties at room temperature.
It is made of a polymeric material with an adhesive force of ~701/cm width.

in this way. When the protective coating layer is of a re-adhesive type, KPa. at least one of the coating layer or the substrate image. It is preferable to provide a means for visually determining the presence or absence of peeling of the coating layer.

The means are. For example, between the support forming the coating layer and the removable adhesive layer. Partially. Should we provide an intervening thin layer that cannot be repaired if destroyed? Alternatively, a surface layer which can be easily broken by the adhesive force of an adhesive layer can be provided around the information recording surface of the base.

On the other hand, it is the opposite of the re-adhesive type. It can also be of a non-re-adhesive type. The types that are not allowed are: It is made of a material that cannot be bonded by heating and pressing after peeling, such as a heat-curing adhesive during coating.
It is a hardening type such as moisture absorption hardening adhesive. In order to prevent the adhesive from damaging the information recording surface, a material with a 11-level adjustment is used.

When the optical information recording medium obtained by the manufacturing method of the present invention is used by mail. Surface of protective coating layer. Or on a surface other than the information recording surface of the substrate. destination. The expiration date and the like are displayed directly or indirectly through a label-like member in a conventional manner.

The optical information recording medium produced in this manner can be produced with or without peeling off the protective coating layer. If the recording medium is a reflective type, for example, a light emitting diode. It can be read with a reading device consisting of a combination of a lens and a photodetector (eg COD).

If the recording medium is transparent, light is applied from one surface. It can be read by a combination of lens '° and photodetector element.

According to the manufacturing method of the present invention. For example, a card that sends the same information to many people. It can be manufactured in large quantities and at low cost.

Especially when it comes to the image-forming stage. The manufacturing process is simple because it uses a dry method that uses light and heat (or ammonia gas). Moreover, it has the characteristic that it is possible to obtain a recording medium with high gradation.

It was a cabinet. If the protective layer is made of a light-transmitting material, it will be unnecessary to remove the layer during reading. When it is opaque under normal conditions and becomes transparent when heated, it can usually be extracted while keeping the information secret. It has the characteristic of being easy to handle, since it is only necessary to heat it to make it brighter during reading.

moreover. If it is made of a material that does not transmit light, secrecy can be maintained. If the card can be re-adhered, it is convenient for storage after reading, and if the card is provided with a means to determine whether the card has peeled off, it can prevent unauthorized reading. Eavesdropping can be done even in cases where it is assumed that reattachment is not possible.

moreover. By displaying information such as destination and expiration date. It can be managed visually.

Claims (1)

[Claims] 1) A first step of forming an image on at least one surface of the substrate using a transparent original prepared by a dry heat development method;
A method for producing an optical information recording medium, comprising a second step of forming at least a protective coating layer on the image forming surface. 2) The method for producing an optical information recording medium according to claim 1, wherein the protective coating layer is made of a light-transmitting material. 3) The method for producing an optical information recording medium according to claim 2, wherein the light-transmitting material is composed of a thermoreversible material that is opaque in normal state and becomes transparent when heated. 4) The method for producing an optical information recording medium according to claim 1, wherein the protective coating layer is made of a light-impermeable material. 5) The method for producing an optical information recording medium according to claim 4, wherein the protective coating layer is provided so as to be readhesive. 6) The method for producing an optical information recording medium according to claim 5, wherein the protective coating layer is provided with means for determining the presence or absence of peeling. 7) The method for producing an optical information recording medium according to claim 4, wherein the protective coating layer has a structure that cannot be re-adhered. 8) The method for producing an optical information recording medium according to claim 1, wherein an indication of destination etc. is provided on the surface of the protective coating layer and/or the surface of the substrate.