JPH0361941B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A new method and still camera has been proposed in which an optical image is once converted into a video signal and then this is recorded on a magnetic disk or the like. Compared to the previous method of recording the optical image (latent image) itself on silver halide film, this method is extremely innovative for still cameras. By the way, with this type of still camera, it is necessary to make a hard copy by some means. The present invention aims to provide an electrophotographic method most suitable for producing such hard copies.

Of course, an electrophotographic method used for such purposes must have high resolution, continuous gradation, and excellent smoothness (gloss). Furthermore, in order to meet the demand for obtaining color hard copies, it is necessary to have excellent color mixing effects.

Generally, if characteristics such as high resolution are important, it is desirable to use a direct method rather than an indirect method as an electrophotographic method. As this direct method, a method in which a toner image is fixed in a solvent vapor is known. This is for slides, and more specifically, a fixed amount of organic solvent such as methylene chloride is ejected onto the surface of a photoreceptor to dissolve the photoreceptor, thereby fixing the toner image. but,
Such materials have poor fixing properties and pose problems in terms of pollution. Furthermore, the gloss is insufficient, and at most it can be used for slides as described above, and cannot be used for hard copies of the electronic still camera described above.

This invention has been made in consideration of these circumstances, and aims to improve not only high resolution, continuous detonation, and smoothness, but also color mixing effect when obtaining color images. The purpose is to provide an electrophotographic method that allows for

In this invention, in order to achieve such an object, the photosensitive material and the white support are integrated so that the toner image formed on the photosensitive material and the transparent adhesive layer on the white support face each other. I'm trying to combine them.

An embodiment of the present invention will be described below with reference to the drawings.

In this example, first, a transparent photosensitive material 1 is prepared. As shown in FIG. 1, this transparent photosensitive material 1 has a transparent electrode layer 3 deposited on a transparent support 2, and a transparent photoconductive layer 4 formed on this transparent electrode layer 3. be. As the transparent support 2, for example, 25~
A 100μ thick polyester film can be used. Further, as the transparent electrode layer 3 and the transparent photoconductive layer 4, for example, an ITO film having a thickness of 0.1 μm and a polyvinyl carbazole film having a thickness of 5 to 20 μm may be used, respectively.

Then, an electrostatic latent image is formed on the transparent photoconductive layer 4 of the above-mentioned transparent photosensitive material 1, and this is developed with toner 5 to form a toner image (FIG. 2). Electrostatic latent imaging is achieved by various processes including full surface corona discharge and exposure.

Next, as shown in FIG. 3, a white support 7 coated with a transparent adhesive 6 is prepared. As the transparent adhesive 6, it is preferable to use one having a refractive index comparable to that of the above-mentioned toner, as described later. The thickness of applying the transparent adhesive 6 is, for example, 5~
It is 10μ. As the white support 7, for example, 150μ thick art paper can be used.

Then, such a white support 7 is laminated on the photoreceptor material 1 on which the above-described toner image is formed. Of course, the transparent photoconductive layer 4 faces the transparent adhesive 6. In this case, pressure or heat is applied to the lamination. This allows the toner 5 to penetrate into the transparent adhesive 6.

In the print formed in this way, toner 5
is supported on the adhesive 6, the fixing power of the toner 5 is greatly improved. Further, since the transparent support 2 is formed on the surface of the print, as can be understood from FIG. 4, sufficient smoothness, that is, gloss, can be obtained. Furthermore, since the transparent support 2 and the white support 7 are arranged on the front and back sides of the print, the mechanical strength is increased. Furthermore, since a direct electrophotographic method is adopted, excellent high resolution and continuous gradation can be obtained.

Furthermore, since the refractive index of the transparent adhesive 6 is approximately the same as that of the toner 5, diffuse reflection at the interface between the two can be prevented, and as a result, the incident light penetrates deep into the toner image (lower part in Figure 4). . When obtaining a color image, for example, cyan, magenta and yellow toners, preferably black toner, are sequentially superimposed (subtractive color mixing). Therefore, in order to improve the color mixing effect, it is necessary for the incident light to reach the position of the toner of the underlying color. In this example, as described above, there is no diffused reflection, so an excellent color mixing effect can be obtained.

Note that, in order to increase the transparency of the toner 5, it is preferable that the particle diameter of the toner 5 is set in accordance with the wavelength of visible light, that is, about 0.3 μm to 0.8 μm.

As described above, according to the present invention, a toner image is formed directly on a photosensitive material, and then a white support coated with a transparent adhesive is placed so that the transparent adhesive faces the toner image. It is laminated onto a photosensitive material. With such a configuration, as is clear from the above, it is possible to obtain prints with high resolution, continuous gradation, fixability, gloss, and mechanical strength. Furthermore, it is also possible to obtain color prints with excellent color mixing effects.

[Brief explanation of drawings]

1 to 4 are cross-sectional views showing one embodiment of the present invention. 1 is a photosensitive material, 2 is a transparent support, 3 is a transparent electrode layer, 4 is a transparent photoreceptor layer, 5 is a toner, 6 is a transparent adhesive, and 7 is a white support.

Claims (1)

[Claims] 1. An electrostatic latent image is formed on the transparent photoconductive layer of a photosensitive material in which a transparent electrode layer and a transparent photoconductive layer are sequentially laminated on a transparent support, and then the electrostatic latent image is electrophotographically developed. An electrophotographic method characterized in that after developing with a toner image to form a toner image, a white support having a transparent adhesive layer is laminated on the photosensitive material so that the toner image and the transparent adhesive layer face each other. .