1989-01-17
1990-03-27
Adams, Russell E.
35412712, 3541451, G03B 1718
Patent
active
049124994
ABSTRACT:
In a photographic camera having a built-in electronic flash, a flash charging indicator, such as an LED, is illuminated whenever the flash capacitor is being charged. If the capacitor is charged for a relatively long time, e.g. 30 seconds, the photographer is alerted by the illuminated indicator of a weak battery condition. According to the invention, the flash charging indicator is additionally used to indicate that the battery source voltage is too low to adequately power a particular camera operation, such as autofocusing. This indication of a weak battery condition is provided at least as long as the particular camera operation is attempted, and it is not dependent on the flash capacitor being charged as in the prior art.
REFERENCES:
patent: 4214827 (1980-07-01), Tominaga et al.
patent: 4290677 (1981-09-01), Baumeister
patent: 4607932 (1986-08-01), Egawa et al.
patent: 4751546 (1988-06-01), Yamamoto et al.
patent: 4816862 (1989-03-01), Taniguchi et al.
Adams Russell E.
Eastman Kodak Company
Fields Roger A.
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