Electronic flash device for a camera

Details Electronic flash device for a camera Electronic flash device for a camera

1974-07-30

1977-05-10

Hix, L. T.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

315241P, 354145, 354289, G03B 716, G03B 1505

Patent

active

040231887

ABSTRACT:
The device according to this invention has a flash tube of the electronic type which is triggered when a charge stored in a capacitor is applied to the tube. A circuit is provided which measures light that is emitted from the tube and is reflected from an object. The light value of the reflected light is compared against a reference value and the emission of light from the flash tube is terminated when the reflected light reaches the level of the reference value. The reference value is electrically set by a mechanism calculating an aperture value set in the camera with a sensitivity value of a film to be used in the camera.

REFERENCES:
patent: 3192496 (1965-06-01), Senoles
patent: 3461783 (1969-08-01), Fujii
patent: 3710701 (1973-01-01), Takishima et al.
patent: 3742828 (1973-07-01), Nakajima et al.
patent: 3760700 (1973-09-01), Trankner et al.
patent: 3779141 (1973-12-01), Ueda et al.
patent: 3779142 (1973-12-01), Yata et al.
patent: 3792484 (1974-02-01), Tsujimoto et al.
patent: 3846806 (1974-11-01), Yata et al.
patent: 3946269 (1976-03-01), Ban

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