Pentagonal roof reflecting mirror assembly

Details Pentagonal roof reflecting mirror assembly Pentagonal roof reflecting mirror assembly

1980-01-25

1981-09-15

Griffin, Donald A.

350 61, G03B 1308, G02B 100

Patent

active

042893925

ABSTRACT:
A hollow pentagonal roof type reflecting mirror assembly for use in a viewfinder optical system of a single lens reflex camera is dust tight to prevent entry of dust into the inside hollow space and includes a filtered vent aperture to allow passage of vapor so that condensation will not occur inside the assembly. The assembly includes a hollow pentagonal body having roof and front mirrors and at least one vent aperture and a shielding or sealing member arranged to close the vent hole. The shielding or sealing member is made of a dust proof and ventilative material such as a foamed plastic, a paper and a cloth to filter out any dust particles.

REFERENCES:
patent: 624517 (1899-05-01), Mercer
patent: 693077 (1902-02-01), Staff
patent: 1716321 (1929-06-01), Pearson
patent: 2165512 (1939-07-01), Schofield
patent: 2465764 (1949-03-01), Underhill
patent: 2508864 (1950-05-01), Lane
patent: 3101412 (1963-08-01), Scott-Maxwell
patent: 3603200 (1971-09-01), Hiruma
patent: 3656421 (1972-04-01), Ataka
patent: 4128321 (1978-12-01), Kobori et al.
patent: 4206991 (1980-06-01), Kobori et al.

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