| 摘要 |
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.
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