| 摘要 |
A light barrier system is provided which includes a light transmitter, a light receiver to receive the light beam transmitted over a predetermined path, an indicator unit which is connected to the light receiver and produces a signal when an obstacle is detected in the path, and a power unit supplying the light transmitter, light receiver and indicator unit. The power unit consists essentially only of a rectifier. A pulsed light source is employed, operated by the discharge of a capacitor in the rectifier output.
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