ELECTRONIC FLASH DEVICE

PROBLEM TO BE SOLVED: To limit a strobe charge current at low temperatures by arranging a temperature sensor in a circuit in order to improve the service life of a battery at low temperatures, in a strobe circuit. SOLUTION: In relation to a time constant of oscillation determined by C and R in the p...

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Bibliographic Details
Main Author ISHIKAWA MOTOHIRO
Format Patent
LanguageEnglish
Published 06.09.2007
Subjects
ACCESSORIES THEREFOR
APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES
APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM
CINEMATOGRAPHY
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
ELECTROGRAPHY
HOLOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To limit a strobe charge current at low temperatures by arranging a temperature sensor in a circuit in order to improve the service life of a battery at low temperatures, in a strobe circuit. SOLUTION: In relation to a time constant of oscillation determined by C and R in the past, a thermistor is added. When it is assumed that the resistance of the thermistor is R(t), the time constant is obtained from C×R×R(t). Since the resistance R(t) becomes sufficiently greater than R at low temperatures, the time constant can be obtained from CR(t), the time constant increases as compared with that at ordinary temperatures, an oscillation frequency is lowered and a current flowing to a transformer is reduced. COPYRIGHT: (C)2007,JPO&INPIT
Bibliography:Application Number: JP20060046908