Method for reducing degradation of an optical image in an exposu

Details Method for reducing degradation of an optical image in an exposu Method for reducing degradation of an optical image in an exposu

1983-07-14

1985-06-04

Louie, Won H.

Radiation imagery chemistry: process, composition, or product th

Producing cathode-ray tube or element thereof

Using specific control or specific modification of exposure,...

430397, 354 1, G03C 504

Patent

active

045215014

ABSTRACT:
In the novel method, light passes upwardly from a light source, through an optical element and then is incident upon a photosensitive layer. A transparent optically-neutral sheet, which may be of glass or plastic, closely spaced above the optical element intercepts extraneous matter that would normally fall on the optical element. At least during the exposing step, the sheet is moved with respect to the optical element to wash out degrading effects of the intercepted material.

REFERENCES:
patent: 3592112 (1971-07-01), Frey
patent: 3782253 (1974-01-01), Van Hekken
patent: 3783754 (1974-01-01), Takemoto et al.
patent: 4013467 (1977-03-01), Hosokoshi et al.
patent: 4157215 (1979-06-01), Hanak
patent: 4408851 (1983-10-01), Chase et al.

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