Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Plural load device systems
Patent
1979-08-20
1981-10-13
Hix, L. T.
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Plural load device systems
354 60F, 354128, 315133, 315151, 315241P, G03B 1505, H05B 4132
Patent
active
042945283
ABSTRACT:
An automatic electronic flash device for use with a camera includes a flash tube carried by a housing. A battery is carried by the housing as a source of electric supply. A capacitor is connected to the flash tube to fire it when discharged. A circuit is used to automatically adjust the amount of light emitted from said flash tube upon the firing of the tube. The circuit includes a light receiving element arranged to receive light reflected from a photographic object upon the firing of the tube. The information of distance from the camera to an object to be photographed is fed to the circuit as a function of the amount of light received. A switch is connected to the circuit to cause it to vary the amount of light emitted from the flash tube. A calculator enables calculation of a plurality of combinations of aperture settings and distance setting in response to a film speed setting, so that selection of a desired film speed will result in indication of a desired aperture setting and distance setting. Light emitting diodes are disposed adjacent to the calculator for indication of one of the combinations calculated by the calculator. Another switch connects one of the light emitting diodes to the battery for selective energization thereof in association with the switching of the above switch connected to the circuit.
REFERENCES:
patent: 3688659 (1972-09-01), Takishima et al.
patent: 3979639 (1976-09-01), Adams, Jr.
patent: 3999193 (1976-12-01), Hasegawa
patent: 4163924 (1979-08-01), Hasegawa et al.
Naya Mikio
Ohta Yoshiharu
Hix L. T,.
Minolta Camera Kabushiki Kaisha
Perkey William B.
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