Real image viewfinder requiring no field lens

Details Real image viewfinder requiring no field lens Real image viewfinder requiring no field lens

1991-05-13

1993-08-31

Gray, David M.

354221, 354222, G03B 1310, G03B 1314

Patent

active

052413373

ABSTRACT:
A real image zooming viewfinder comprising three optical units with refracting optical power and an additional moving reflective optical unit. Zooming is accomplished by moving one of the refractive optical units and the additional reflective optical unit or by moving the first and the second optical units. The need for field lens is eliminated by having the first and the second unit cooperate to make the finder system telecentric with respect to principal rays at the intermediate image plane.

REFERENCES:
patent: 4707098 (1987-11-01), Wakamiya
patent: 4707103 (1987-11-01), Ikemori et al.
patent: 4838668 (1989-06-01), Betensky et al.
patent: 4887109 (1989-12-01), Fujita et al.
patent: 4972216 (1990-11-01), Ueda et al.
patent: 5014078 (1991-05-01), Kudo et al.
patent: 5052787 (1991-10-01), Sugawara

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