Focusing screen for reflex cameras having integral range finder

Details Focusing screen for reflex cameras having integral range finder Focusing screen for reflex cameras having integral range finder

1975-06-11

1977-01-18

Corbin, John K.

354200, G02B 504, G03B 1328

Patent

active

040036375

ABSTRACT:
A focusing screen of a type incorporating range finder prisms in a generally centrally disposed area thereon characterized in that the prisms are of microprism type and are arranged into concentric areas, the microprism in a first area refracting light rays in a first direction along a given axis, and the microprisms in a second area refracting light rays in an opposite direction along the same axis, whereby the functions of conventional split prism and conventional microprism construction are combined. To facilitate focusing on objects having principal horizontal or vertical lines, the refracting axes are aligned at an angle relative to the horizontal and vertical axes of the screen.

REFERENCES:
patent: 2669916 (1954-02-01), Dodin
patent: 2986599 (1961-05-01), Lindner et al.
patent: 3149547 (1964-09-01), Jurenz
patent: 3233533 (1966-02-01), Sauer

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