Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Load device irradiating the radiant energy responsive device
Patent
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
LaRoche Eugene R.
West Electric Co. Ltd.
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