Light barrier

Abstract

The present invention relates to an optical fence for monitoring optical path, having a base assembly with a first emitter for emitting an optical signal and a first receiver for generating an output signal for control. According to the invention, the optical fence is provided with a fed reflector assembly having a second receiver and a second emitter, wherein the second receiver being used for receiving the optical signal emitted by the first emitter, and the second emitter being used for emitting a feedback signal based on the received optical signal.

Description

technical field

[0001] The invention relates to a light barrier for monitoring a light path, having a base assembly with a first emitter for emitting a light signal and a first receiver for generating an output signal for control device. In particular the invention relates to light barriers for controlling door drives. Background technique

[0002] An object in the monitored light path can be detected by such a light barrier, ie the receiver is used to check whether an object obstructs the light signal emitted by the transmitter. The receiver of the base unit evaluates the radiated light signal and provides a corresponding switching signal at the control output. In this respect, both an operating principle with a static output signal and a dynamic principle are possible.

[0003] Known light barriers can be designed as one-way light barriers, wherein a transmitter is arranged on one side of the light path to be monitored and a receiver, which is directly irradiated by the...

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