Patent
1981-06-24
1983-06-14
Adams, Russell E.
354128, 354145, G03B 716, G03B 1503
Patent
active
043879764
ABSTRACT:
The present invention provides an electronic flash device which has a function of light measuring device. The electronic flash device comprises, substantially, a flash unit for generating flash light, a flash control unit for controlling the flash light generated from said flash unit and a light measuring unit for measuring another light source. The flash unit comprises electric power supplying means for supplying electric power, electric energy storing means for storing the electric energy supplied from said electric energy storing means, flash light generating means for converting the electric energy stored in said electric energy storing means to an optical energy, and said flash control unit comprises, substantially, first light receiving means for receiving a reflecting light, flash light quantity detecting means for detecting flash light quantity, means for indicating light exposure quantity, and flash light quantity control means. The light measuring unit comprises, substantially, second light receiving means for receiving the another light source such as another flash device, and portions of circuits of said flash unit and flash control unit. The flash device of the present invention can be employed as an independent light measuring device and is convenient to adjust the photographing distance and a diaphragm of a camera in photographing.
REFERENCES:
patent: 4035814 (1977-07-01), Nobusawa
patent: 4192590 (1980-03-01), Kitaura
patent: 4256391 (1981-03-01), Kitaura
patent: 4274723 (1981-06-01), Igarashi
patent: 4306176 (1981-12-01), Kaneko et al.
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