Electronic shutter driving device for camera

Details Electronic shutter driving device for camera Electronic shutter driving device for camera

1978-07-12

1980-07-22

Hix, L. T.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

354 51, 328145, 307229, G03B 708, G06G 724

Patent

active

042136830

ABSTRACT:
An electronic shutter driving device has a logarithmic expansion circuit which includes no semiconductor element such as a transistor and a field-effect transistor and comprises an operational amplifier, a series of resistors connected to an inverting input terminal of the operational amplifier, a plurality of capacitors interconnected between the inverting input terminal of said operational amplifier and the junctions, respectively, between the resistors and an integrating capacitor interconnected between the inverting input terminal and output terminal of the operational amplifier, a source voltage being applied to the output terminal or a reference voltage input terminal of said operational amplifier.

REFERENCES:
patent: 4057809 (1977-11-01), Nakamoto et al.

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