Photographic camera having a picture size switching device

Details Photographic camera having a picture size switching device Photographic camera having a picture size switching device

1995-10-05

1997-10-14

Lee, Eddie C.

Photography

Having camera indicator

Film condition indicator

396407, 396435, G03B 1702, G03B 100

Patent

active

056780818

ABSTRACT:
A photographic camera including a picture size switching device adapted to switch the picture size between a regular size, for example, of 36 mm.times.24 mm and a panoramic size, for example, of 65 mm.times.24 mm, wherein, when it is intended to switch the picture size, a predetermined quantity of a roll of film is fed or rewound so that a space of a predetermined extent may be generated between the adjacent previously exposed film frame and the following film frame to be exposed and thereby multiple exposure as well as wastefulness of the film may be avoided. Additionally disclosed is a photographic camera of the so-called preliminary take-up type including a picture size switching device having a spool for taking up the entire roll of film contained within a cartridge in order to measure a full length of the roll of film so that a film quantity rewound during shutter release and a film quantity fed or rewound during changeover of the picture size may be subtracted from the full length of the roll of film to determine a residual film length based on which the number of film frames still available for photographing in the selected picture size may be calculated. The number of film frames may then be displayed to reliably inform a user of the number of frames remaining.

REFERENCES:
patent: 4436399 (1984-03-01), Koch et al.
patent: 4903060 (1990-02-01), Hoshino et al.
patent: 5066971 (1991-11-01), Kodaira
patent: 5345285 (1994-09-01), Hashushita et al.
patent: 5504549 (1996-04-01), Kazami et al.

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