JPH01262575A - Photosensitive material sheet - Google Patents

Abstract

PURPOSE:To make duplication impossible and to facilitate management of photographs by forming a base layer with fine grooves for light interference formed on the surface, a reflection preventive layer closely attached to this base layer and to be made transparent by development processing, and an emulsion layer closely attached to this layer and to be used for exposure and development. CONSTITUTION:The photosensitive material sheet 10 comprises the base layer 12 with fine grooves 18 for light interference formed on the surface, and the reflection preventive layer 14 closely attached to this base layer 12 and to be made transparent by development processing, and the emulsion layer 16 closely attached to this layer 14 and to be used for exposure and development. When this photosensitive sheet 10 is exposed and developed and fixed, the layer 14 is decolored and made transparent by the silver removal treatment after development, and the developed image of the emulsion layer 16 can be observed by the eye, but when duplication operation is tried by projecting light on the layer 16 to reflect the image of the layer 16, and projecting the reflected light on a photosensitive material, the light passed through the layer 16 and reflected by the fine grooves, and causes light interference, and makes the reflected image unsharp, and accordingly, the duplication of the image becomes impossible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photographic sheet in which an image is developed after being exposed to light, and more particularly to a photographic sheet provided with optical interference means to prevent copying of the image.

[Background Art] With photographic sheets such as photographic paper, in which the image is fixed by developing it after the image is exposed to light on the emulsion side, it is possible to easily copy the image by applying this to a PPC copying machine, etc. can. Therefore, the management of photographic sheets having images that do not like to be easily copied is complicated.

The present invention takes the above-mentioned facts into consideration, and even when using a copying machine that irradiates light from a light source and copies using the reflected light, it is possible to obtain a photographic sheet that makes the reflective original blurred and makes copying impossible. It is a purpose.

[Summary of the invention]

The present invention includes a base layer in which fine grooves for optical interference are formed;
It is characterized by having an antireflection layer that is in close contact with this base layer and made transparent by development processing, and an emulsion layer for exposure and development that is in close contact with this antireflection layer.

Therefore, in the present invention, when an image is exposed to the emulsion layer and this image is developed and fixed, the antireflection layer is decolorized and made transparent during this development. As this antireflection layer, an antihalation layer of a film or an already exposed emulsion can be used. Therefore, even if an image formed on the emulsion surface is reflected by light from a light source and an attempt is made to copy the image on the emulsion surface using this reflected image, the light irradiated onto the emulsion surface will be reflected by the transparent anti-reflection film. As light passes through the layer and is reflected by the fine grooves in the base layer, light interference occurs, causing the reflected original to become unclear.
Copying becomes impossible.

[Embodiments of the invention]

FIG. 1 shows a photosensitive material sheet 10 to which the present invention is applied. In this photosensitive material sheet 10, an antireflection layer 14 is closely coated on a base layer 12 made of paper, synthetic resin, etc., and an emulsion layer 16 is further applied to this antireflection layer 814.

As the base layer 12 and the emulsion layer 16, a commonly used combination of photographic paper and an emulsion layer can be used. Further, as the antireflection layer 14, an antihalation layer of a film or a so-called fogged emulsion that has been exposed in advance can be applied.

Furthermore, fine grooves 18 are formed in the surface of the base layer 12 to which the antireflection layer 14 is applied. The fine grooves 18 are formed by laser processing or by moving a roller having fine irregularities.

Also, the fine grooves 18 do not need to be regular (
It may be irregular.

When an image is exposed to the emulsion layer 16 of the photosensitive material sheet 10, the antireflection layer 14 has been subjected to antireflection treatment, so the image exposed to the emulsion layer 16 is different from that of ordinary photographic paper. Similarly, printing is performed accurately.

When the exposed photosensitive material sheet 10 is developed and fixed in a developing device, the antireflection layer 14 is decolorized and made transparent by the desilvering treatment after the development. Therefore, although the developed image of the emulsion layer 16 can be visually recognized, it is difficult to copy the reflected image. That is, even if an attempt is made to copy by irradiating the emulsion B 16 with light from a light source (not shown) to reflect the image on the emulsion layer 16 and irradiating this reflected image onto the photoreceptor, the light that has passed through the emulsion layer 16 will not be reflected in the fine grooves 18. When the light is reflected by the light, interference occurs and the reflected image becomes unclear, making it impossible to copy.

〔Effect of the invention〕

As explained above, since the present invention uses fine grooves for optical interference, it has an excellent effect of blurring the reflected image and preventing copying.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a photosensitive material sheet to which the present invention is applied. DESCRIPTION OF SYMBOLS 10... Photosensitive material sheet, 12... Base layer, 14... Antireflection layer, 16... Emulsion layer, 18... Fine groove.

Claims (1)

[Claims] (1) A base layer in which fine grooves for light interference are formed, an antireflection layer that is in close contact with this base layer and made transparent by development processing, and an emulsion layer for exposure and development that is in close contact with this antireflection layer. A photosensitive material sheet characterized by having the following.