Phase-type diffusing plate

Details Phase-type diffusing plate Phase-type diffusing plate

1990-02-21

1992-02-18

Hix, L. T.

Optical: systems and elements

Prism

With reflecting surface

359569, G03B 300

Patent

active

050898353

ABSTRACT:
A focusing screen suited to be used in the camera, having three plane portions of different heights in each of small areas, wherein the plane portion A, the plane portion B and the plane portion C are arranged in the order from the lowest height, and letting the height of the plane portion B measured from the plane portion A be denoted by d.sub.B, the height of the plane portion C from the plane portion A by d.sub.C, and the area ratios of the plane portions A, B and C to the entire area by S.sub.A, S.sub.B and S.sub.C (where S.sub.A +S.sub.B +S.sub.C =1) respectively, the following conditions are satisfied

REFERENCES:
patent: 4338012 (1982-07-01), Matsumura et al.
patent: 4547663 (1985-10-01), Kitagishi et al.
patent: 4586786 (1986-05-01), Suzuki et al.
patent: 4598977 (1986-07-01), Kobayashi
patent: 4679901 (1987-07-01), Dammann et al.

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