Camera for daylight and flash photography

Details Camera for daylight and flash photography Camera for daylight and flash photography

Filed on

1977-05-17

Date issued

1979-09-25

Examiner

Hix, L. T.

Other Related Categories

354 60F, 354212, 354268, G03B 1505, G03B 100, G03B 1738

Type

Patent

Status

active

Patent number

041688910

Description

ABSTRACT:
A camera having an electronic flash unit either incorporated therein or removably attached thereto is provided with a flash mode selector and a flash energy supply control switch both arranged to be rendered operative when the shutter cocking lever is pulled from the retracted position to an initial position effective for shutter cocking operation, and, upon detection of occurrence of a lower light value beyond an automatically operating daylight diaphragm aperture range, to be simultaneously closed in automatic response to an actuation of a shutter release trigger in excess of a normal stroke length. This is done while still preventing the shutter from running. When the voltage on a storage capacitor reaches a trigger level for the flash tube in a time interval measuring from the closure of the switch, a flash exposure diaphragm aperture is automatically formed depending upon the flash exposure value and the voltage of the storage capacitor. When the shutter cocking lever is retracted, the switch is opened to prevent accidental consumption of the electrical energy of the power source.

REFERENCES:
patent: 3073226 (1963-01-01), Greger et al.
patent: 3078772 (1963-02-01), Goshima
patent: 3367251 (1968-02-01), Furuta
patent: 3529524 (1970-09-01), Ueda
patent: 3714872 (1973-02-01), Mashimo et al.
"Photographic Industries", Apr. 1961, Canon's Canonet Camera.

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