Battery voltage checking device for cameras

Details Battery voltage checking device for cameras Battery voltage checking device for cameras

1984-04-12

1985-06-11

Adams, Russell E.

354484, 35412712, G03B 1718

Patent

active

045224803

ABSTRACT:
A battery checking device for cameras of the type having a booster circuit the output of which is fed as electrical power to a load is disclosed. In the case of the camera of the type described, when the battery voltage is checked at the output of the booster circuit, an accurate checking operation cannot be carried out. The present invention, therefore allows the voltage at the input of the booster circuit to be checked. Since another problem is that the booster circuit, after having been actuated, takes a predetermined time before its operation is stabilized, and the value of voltage as sensed during this time does not provide an accurate representation, the present invention provides that checking of that input voltage begins after the elapse of a predetermined time from the actuation of the booster circuit when the operation of the booster circuit becomes stable. Accordingly, it is made possible to achieve always an accurate and reliable battery checking operation.

REFERENCES:
patent: 4068150 (1978-01-01), Iwata et al.
patent: 4131351 (1978-12-01), Iwata et al.
patent: 4176933 (1979-12-01), Watanabe
patent: 4290677 (1981-09-01), Baumeister
patent: 4354750 (1982-10-01), Hasegawa et al.

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