Camera with means for maintaining a constant DC supply voltage

Details Camera with means for maintaining a constant DC supply voltage Camera with means for maintaining a constant DC supply voltage

1976-03-04

1977-05-24

Hix, L. T.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 13, 323 15, 323DIG1, G03B 100, G05F 162

Patent

active

040259358

ABSTRACT:
The exposure control circuit of the camera requires a supply voltage which must have an amplitude exceeding a predetermined minimum amplitude. The camera battery is subject undesired decreases in battery output voltage. A transverter circuit has an input connected to the battery and in response to the battery output voltage furnishes a DC output voltage to the exposure control apparatus when the battery output voltage has an amplitude less than the predetermined minimum amplitude. A control circuit is responsive to the voltage applied to the exposure control apparatus and controls a controllable impedance connected between the transverter input and the battery so that the supply voltage applied to the exposure control apparatus remains constant at a value just exceeding the predetermined minimum amplitude when the battery output voltage is too low and disconnects the transverter circuit from the battery when the battery output voltage exceeds the predetermined minimum amplitude. In the latter case a diode is provided for applying the battery output voltage directly to the exposure control circuit.

REFERENCES:
patent: 3792341 (1974-02-01), Kline
patent: 3983472 (1976-09-01), Morris
patent: 3995291 (1976-11-01), Momose

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