Radiation imagery chemistry: process – composition – or product th – Holographic process – composition – or product
Patent
1990-11-15
1997-07-22
Angebranndt, Martin
Radiation imagery chemistry: process, composition, or product th
Holographic process, composition, or product
430 4, 430 2, 430 7, 359 12, 359 22, G03H 130, G03H 120, G03H 104
Patent
active
056502478
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to preparing and reproducing filters and preparing filter photographic materials. More particularly, this invention is concerned with preparing and reproducing color filters by the application of holography and preparing filter photographic materials well-suited for recording electrostatic images.
BACKGROUND TECHNIQUE
Color filters so far used in various fields are of the dyed type. Because of their processes of preparation being complicated, however, it has been attempted to prepare color filters by the application of holography.
FIG. 1 is a view for illustrating a conventional process for making color filters by the application of holography.
Referring to FIG. 1, a photosensitive or photographic material 12 is located in opposition to a mirror 13 and a mask 11 having a striped pattern, for instance, is brought into close contact with the material 12. Light incident from above the mask 11 is reflected from the mirror 13 to make an interference fringe, which is in turn recorded in the photographic material 12 to prepare a color filter.
When dirt, dust, etc. are present between the photographic material and the mask in close contact with it, the gap varies, giving rise to the blurring of the mask image. Thus, a serious problem with such a conventional process as shown in FIG. 1 is that a considerable difficulty is encountered in bringing the photographic plate in constantly close contact with the mask in a certain relation.
Even though the close contact is achieved at a certain interval, it is most likely that the mask image may blur due to the thickness of the photographic material itself.
Color filters heretofore used are of the dyed type.
FIG. 2 is a view showing a conventional process for making the dyed type of color filters.
As illustrated, a gelatine layer is first coated on a glass substrate 21 and then subjected to pattern exposure to form a gelatine pattern layer. Next, a dye is fixed to the gelatine pattern layer 23 by treatments with, e.g., tannic acid to make a monochromatic pattern filter. A color filter, which may be in striped, mosaic or other forms, is obtained by repeating the pattern exposure and the formation of the gelatine and dyed pattern layers for each of three colors.
A problem with such a conventional process for making the dyed type of color filters as shown in FIG. 2, however, is that its process of preparation is too complicated to increase the production cost. Another problem is that it is difficult to make a pattern of sufficient resolution.
Still another problem is that a serious difficulty is experienced in getting the overlapping chromatic images in correct registration, since it is required to carry out pattern exposure for each of three colors cyan, magenta and yellow or red, green and blue.
On the other hand, silver salt photography is known as a high-sensitivity photographic technique, in which a photographic image is recorded on a film or the like through a developing step. The image is reproduced with a silver salt emulsion (photographic paper, etc.) or displayed on a cathode ray tube (CRT for short) by the optical scanning of the developed film.
There is also now available an electrophotographic technique. According to this technique, an electrode is deposited onto a photoconductive layer, the photoconductor is electrified on its overall surface by corona electrification in a dark place and then exposed to intense light to make a light-striking region electrically conductive. That region is then rid of charges to optically form an electrostatic latent image on the surface of the photoconductor. Finally, a toner having charges of polarity different from or identical with that of the residual charges is deposited onto the latent image for development. This is primarily used for copying purposes, and cannot be used for photographic purposes due to its low sensitivity. Also, toner development should usually be carried out just after the formation of the latent image, because the retention time or duration electrostatic c
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Benv & Wolf "Principles of Optics" 1970 p. 280 Fourth Ed. Pergaman Press.
Taniguchi Yukio
Utsumi Minoru
Angebranndt Martin
Dai Nippon Printing Co. Ltd.
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