Focusing screen

Details Focusing screen Focusing screen

1989-05-04

1991-01-01

Brown, Brian W.

350127, G03B 300

Patent

active

049822144

ABSTRACT:
A focusing screen includes a regular array of a plurality of unit regions on an optically transparent substrate, and an irregular array of a plurality of minute patterns of at least two different sizes in convex or concave form on a surface of the substrate.

REFERENCES:
patent: 3718078 (1973-02-01), Plummer
patent: 4519686 (1985-05-01), Seki et al.

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