| 摘要 |
Optoelectronic device for detecting the passage of an object through the light beam flowing from the light-emitting diode (1) to the phototransistor (2). This device has a control loop which includes a unity-gain amplifier (14), a low-pass filter (15, 16, 18) and a transistor (11) and being closed by the beam. This loop stabilises the collector voltage of the phototransistor (2) in the presence of parasitic interference. The low-pass filter prevents it from acting on the useful signal. Application to the production of a stop motion. <IMAGE>
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