Lens-fitted photographic film unit

Details Lens-fitted photographic film unit Lens-fitted photographic film unit

1994-05-31

1997-05-06

Perkey, W. B.

Photography

Having camera indicator

Having display in viewfinder

396351, 396505, 396535, G03B 1717, G03B 1720

Patent

active

056280394

ABSTRACT:
A telephotographic optical system is incorporated into a mechanism unit with an exposure mechanism, and the mechanism unit is removably attached to a main body having a cassette chamber and a film roll chamber as an integral body. The telephotographic optical system is constituted by a telephotographic taking lens, and a pair of mirrors attached to an exposure chamber so as to conduct light entering through the taking lens along a Z-shaped light path toward an exposure aperture. A lens aperture changing mechanism is also incorporated in the mechanism unit. A switching member of the lens aperture changing mechanism is disposed on an upper wall portion of the film unit. An aperture-stop member having at least a lens aperture is moved by the switching member so as to place the lens aperture in the exposure light path. A color filter or an ND filter is inserted in the field of view of the viewfinder to indicate that the lens aperture is placed in the exposure light path, in cooperation with the aperture-stop member.

REFERENCES:
patent: 2378406 (1945-10-01), Harris
patent: 4195926 (1980-04-01), Katayama
patent: 4213686 (1980-07-01), Kellner
patent: 4307951 (1981-12-01), Saito
patent: 4344685 (1982-08-01), Milatz
patent: 4544252 (1985-10-01), Tsukamoto
patent: 4910545 (1990-03-01), Fujibayashi et al.
patent: 5001502 (1991-03-01), Douglas
patent: 5084719 (1992-01-01), Hara et al.
patent: 5140354 (1992-08-01), Burnham
patent: 5235367 (1993-08-01), Boyd et al.
patent: 5381200 (1995-01-01), Takayai

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