Camera and exposure control method

Details Camera and exposure control method Camera and exposure control method

1997-12-09

2000-04-18

Perkey, W. B.

Photography

Exposure data from film itself

396299, G03B 700

Patent

active

06052538&

ABSTRACT:
A roll photo film includes a photo filmstrip having an effective exposure region in which plural frames are formable one after another. Light-shielding leader and trailer are disposed on respective ends of the photo filmstrip. The roll photo film is pre-wound with the trailer wound inwards and with the leader wound outwards. A bar code is prerecorded between a front end of the leader and the effective exposure region, represents information of an auto input photosensitivity value. A camera is used with the roll photo film. In the camera, a bar code reader reads the bar code to detect the auto input photosensitivity value. A photosensitivity dial is externally operable, and inputs a manual input photosensitivity value. A mode selector, in combination of a pointer and a movable indicia, is externally operable, and selects one of automatic and manual modes. The auto input photosensitivity value becomes effective when selecting the automatic mode. The manual input photosensitivity value becomes effective when selecting the manual mode. An exposure control unit controls an amount of exposure to the effective exposure region in accordance with an effective one of the auto and manual input photosensitivity values.

REFERENCES:
patent: 4579433 (1986-04-01), Ishizaka et al.
patent: 4676616 (1987-06-01), Hoda et al.
patent: 4693574 (1987-09-01), Ohnuki et al.
patent: 5596381 (1997-01-01), Murakami et al.
patent: 5845869 (1998-12-01), Makino

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