External sensor for electronic flash

Details External sensor for electronic flash External sensor for electronic flash

1978-03-21

1980-05-06

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315135, 315241P, 354 33, 354 35, 354145, H05B 4132

Patent

active

042019346

ABSTRACT:
An external sensor which may be detachably electrically connected to an electronic flash of the type having a flash duration control circuit for controlling the flash duration of a flash tube which flashes by discharging the electrical energy stored on a main capacitor, the external sensor including a light receiving unit which, in the automatic flash exposure mode, receives the light emitted from the flash and reflected back from a subject. In the automatic flash exposure mode in which the flash duration control circuit is activated in response to an interrupt signal from the light receiving unit, the external sensor selectively displays correct flash exposure data such as film speed, aperture and distance to a subject.

REFERENCES:
patent: 3688659 (1972-09-01), Takishima et al.
patent: 3774072 (1973-11-01), Ogawa
patent: 3846806 (1974-11-01), Yata et al.
patent: 4125766 (1978-11-01), Holtje

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