Focusing screen

Details Focusing screen Focusing screen

1981-11-12

1984-04-17

Griffin, Donald A.

350286, G02B 504, G03B 1328

Patent

active

044430884

ABSTRACT:
A focusing screen includes a plurality of light deflecting portions, each of which includes a prism component having a light deflecting function for providing part of an out-of-focus image with displacement in one direction, and a diffraction grating component formed on the prism component and having a plurality of unit structures. At least a portion of each of the unit structures is formed by a curved surface.

REFERENCES:
patent: 2881686 (1959-04-01), Ruhle
patent: 3004470 (1961-10-01), Ruhle
patent: 4003637 (1977-01-01), Masuaka
patent: 4338012 (1982-07-01), Matsumura et al.

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