Focusing screen and a method of forming a microstructure array f

Details Focusing screen and a method of forming a microstructure array f Focusing screen and a method of forming a microstructure array f

1990-04-05

1992-02-04

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making named article

430320, 354200, 359619, G03C 500

Patent

active

050859773

ABSTRACT:
A method of forming a microstructure array suitable for use in the production of a focusing screen used in a finder system of a camera. The focusing screen includes an optical material in plate form having on one surface of a plurality small lens portions that project in a regular array of equilateral triangles from the optical material and each of the which has concentric contour lines, with a central apex. A flat portion is formed between adjacent small lens portions and a constricted portion is formed in the middle portion of the inclined surface of each small lens portion, with an irregular pattern of finer asperities is formed on the surfaces of the small lens portions and the flat portion. The high and low spots can be reversed. The method of forming a microstructure array includes the steps of forming a fine pattern of elements on a layer of light-sensitive material capable of transforming a distribution of light intensity to a surface relief by exposing the layer through a microlens array to rays of light with an intensity distribution corresponding to individual elements of the fine pattern. The microlens array may be replaced with a group of pinholes.

REFERENCES:
patent: 4421398 (1983-12-01), Suzuki et al.
patent: 4427265 (1984-01-01), Suzuki et al.
patent: 4523807 (1985-06-01), Suzuki
patent: 4567123 (1986-01-01), Ohtaka et al.
patent: 4689291 (1987-08-01), Popovic et al.

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