| 摘要 |
<p>A circuit arrangement for the shutter release clearance of photographic cameras having automatic exposure control is provided, the light measuring stage of which comprises an operational amplifier (1) having a logarithmic diode (2) connected in its feedback branch and which furthermore comprises an analogue-digital converter (4) and a computing circuit (12) for determining exposure values such as exposure time and/or stop aperture. Behind the output of the operational amplifier (1), there is connected a circuit (5) for detecting the responded state of the light measuring stage, the output signal from which circuit forms, in the computing circuit (12), a signal for clearance of the shutter release of the camera. <IMAGE></p> |
