Opaquing method and apparatus thereof

Photocopying – Projection printing and copying cameras – Identifying – composing – or selecting

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355 77, 355 80, 355 81, G03B 2752

Patent

active

048355763

ABSTRACT:
In the negative form of lith type film or photographic printing paper, the ground part is light-untransmissible and image part (letter, pattern) is light-transmissible. Apart from them, pinholes and stains also constitute light-transmissible areas. Although the light-transmissible areas of letter and pattern are necessary, the light-transmissible areas of pinhole and stain are unnecessary. Thus, the unnecessary light-transmissible areas must be distinguished from the necessary light-transmissible areas, and an opaque layer must be provided on the unnecessary areas to make them opaque. Generally, however, the unnecessary light-transmissible areas are minute and many in number, so that their detection and opaquing is a very laborious work. Thus, according to the opaquing method of the present invention, only the necessary light-transmissible area is detected and the other light-transmissible areas are regarded as unnecessary and the latter are stopped out. Otherwise, unnecessary light-transmissible areas are detected, and they are stopped out. The opaquing apparatus of the invention is equipped with a means for exposing a lith type film or a photographic printing paper to light, a means for detecting necessary light-transmissible area, and a means for providing an opaque layer on the unnecessary light-transmissible areas detected by the detecting means.

REFERENCES:
patent: 3537788 (1970-11-01), Young
patent: 3687887 (1972-08-01), Zabiak
patent: 4012122 (1977-03-01), McVeigh

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