Dustproof view finder

Details Dustproof view finder Dustproof view finder

1991-11-19

1993-10-05

Gellner, Michael L.

G03B 1302

Patent

active

052509699

ABSTRACT:
A dustproof view finder in which an image formed by an objective optical system is made erect by an image erecting optical system and is observed through an ocular optical system as an erect image, the optical system including a pair of front and rear optical elements spaced from one another at a predetermined distance to define an aerial space therebetween, and a seal member which encloses the aerial space.

REFERENCES:
patent: 3915552 (1975-10-01), Rickert
patent: 4119985 (1978-10-01), Ando et al.
patent: 4209247 (1980-06-01), Urano et al.
patent: 4294529 (1981-10-01), Sato et al.
patent: 4381892 (1983-05-01), Someya
patent: 4452522 (1984-06-01), Murakami et al.
patent: 4705374 (1987-11-01), Robings
patent: 4969723 (1990-11-01), Kato et al.

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