JPS6131456B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing transparent photographic panels, such as slides, using a plurality of photographic prints of the same size reproduced from the same original.

Transparent photographic panels can be obtained by applying a light-sensitive emulsion to one side of a substrate, such as a plastic film or a glass plate, and exposing, developing and fixing the light-sensitive emulsion. However, the photographic panels obtained in this way have insufficient contrast and color intensity, so that when used, for example, for decorative or advertising purposes, it is necessary to illuminate them from the back, and in the absence of illumination. In some cases, the tone is so dark that the displayed content cannot be discerned. In addition, in the case of photographic paper, although illumination from the back is not necessary, the display effect is insufficient because it relies only on reflected light.

An object of the present invention is to provide a method for manufacturing a photographic panel that not only exhibits a good display effect even with reflected light from front illumination, but also exhibits an even better display effect when illuminated from the back. The purpose is

Next, the steps of the method of this invention will be explained with reference to the drawings. In FIG. 1a, 1 is a transparent substrate made of plastic such as acrylic resin or vinyl chloride resin, and 2A and 2B are photographic prints of the same size reproduced from the same original. These photographic prints 2A and 2B were obtained by enlarging in a normal manner using normal photographic paper, and going through the steps of developing, fixing, washing, and drying, and therefore each of them is, for example, As shown in Figure 3, base paper 1
1, intermediate layer 12, emulsion layer 13 and gelatin layer 1
4, and the image is formed within the emulsion layer 13. The intermediate layer 12 is made of baryta or polyethylene, and in either case, it is milky white in order to improve the clarity and whiteness of the image. In the first step shown in FIG. 1a, a water-resistant adhesive is applied to the back surface of the substrate 1 and the surfaces of the photographic prints 2A and 2B (the surface of the gelatin layer 14) by means such as spraying, and then dried.

FIG. 1b shows a second step of adhering the photographic prints 2A to the back surface of the substrate 1 using the adhesive applied to each. Substrate 1 and photographic print 2
Since the adhesive applied to A has already dried, the two are bonded together by applying a suitable solvent to the surface of each adhesive layer and then bringing them into close contact with each other. Next, the base paper 11 of the photographic print 2A is removed. This removal of the base paper 11 can be done, for example, by first mechanically peeling off the base paper 11, and then
This can be easily done by removing the remaining paper fibers using a releasing agent such as an aqueous NaOH solution, and this third step results in the following: A gelatin layer 14, an emulsion layer 13 and an intermediate layer 12 are formed on the back surface of the substrate 1 via an adhesive layer 21.
An intermediate process product to which is bonded is obtained.

In the fourth and fifth steps, the photographic print 2B is attached to the surface of the intermediate process product shown in FIG. , and then removing the base paper 11. However, when pasting the photographic print 2B in this fourth step, the photographic print 2B that has already been pasted is
It is necessary to accurately match the image of the photographic print 2B with the image of A.

As shown in FIG. 2b, the photographic panel obtained through all the above steps has an adhesive layer 21, a gelatin layer 14, an emulsion layer 13, and an intermediate layer 1 on the back surface of the substrate 1.
2, adhesive layer 22, gelatin layer 14, emulsion layer 13
and an intermediate layer 12, which have a structure in which eight layers are laminated in this order. The images of the two emulsion layers 13 precisely match each other, resulting in high contrast and density, and the milky white translucency of the intermediate layer 12 makes it possible to reduce the amount of light incident from the surface of the substrate 1. When viewed only by reflection, it has the same appearance as a normal print, and when the back side is illuminated with a fluorescent light, it gives the same visual effect as a slide.

Note that in the above embodiment, 2
Although two photographic prints are superimposed, three or more photographic prints may be superimposed if the contrast of the prints is low or if a special visual effect is to be obtained. Further, when the intermediate layer of the photographic print is made of baryta, a water-resistant paint may be applied to the outermost intermediate layer in order to improve stability against water and moisture.

As described above, according to the present invention, it is possible to easily obtain a photographic panel that provides excellent visual effects in both cases of reflected light and transmitted light.

[Brief explanation of the drawing]

Figures 1a and b are explanatory diagrams showing the steps of the method of this invention, Figure 2a is a vertical cross-sectional view of a part of the intermediate product of the invention, and Figure 2b is a vertical cross-section of a part of the completed photographic panel. The plan view and FIG. 3 are longitudinal sectional views of a part of the photographic print used in the present invention. 1...Substrate, 2A, 2B...Photo print, 11...
... Base paper, 12 ... Intermediate layer, 13 ... Emulsion layer, 14
... Gelatin layer, 21, 22 ... Adhesive layer.

Claims (1)

[Claims] 1. Apply an adhesive to the surfaces of multiple photographic prints of the same size obtained from the same original plate, apply an adhesive of the same quality as the above adhesive to one side of a separately prepared transparent substrate, and combine the above substrate and the above photograph. After gluing the two together with one of the prints so that their adhesive-coated surfaces face each other, only the original paper of this photo print is removed, and then the image is adjusted so that it matches the image of the photo glued to the substrate. A method for manufacturing a photographic panel, comprising the steps of stacking and adhering the photographic prints and then removing the base paper.