Optoelectronic device for detecting marks has test transmitter for activation by evaluation unit to perform self-test by emitting test beam forming defined test sequence coupled into receiver

摘要

The device has a light beam transmitter and receiver (6) and an evaluation unit. Light passed over and reflected from marks has a superimposed contrast pattern corresponding to the marks that is evaluated to detect the marks. At least one test transmitter (20) can be activated by the evaluation unit to perform a self-test by emitting a test beam (19) forming a defined test sequence coupled into the receiver and evaluated in the evaluation unit.