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US 2011/0253884 A1Published application
Light barrier and method for the operation of a light barrier
OwnerBernd Ottleben, Petra Ottlebeninventors
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OwnerBernd Ottleben, Petra Ottlebeninventors
Estimating the term…
A light barrier having a signal path (1) between a first transceiver arrangement (2), emitting a signal beam (4), and a mirror, returning the incident signal beam (4), allows reliable operation even when the length is great and under changing ambient conditions by virtue of the mirror being in the form of a second transceiver arrangement (3) and by virtue of both transceiver arrangements (2, 3) having a receiver (6), a controllable and encodable transmitter (8) and an evaluation and control device (7), connected to the receiver (6), for evaluating the intensity and an encoding of the received signal beam (4, 5), and for controlling the intensity and encoding of the emitted signal beam (4, 5), wherein the encoding is performed using a piece of information about the intensity of the received signal beam (4, 5).
A light barrier having a signal path (1) between a first transceiver arrangement (2), which emits a signal beam (4), and a reflecting device which returns the incident signal beam (4), wherein the reflecting device is in the form of a second transceiver arrangement (3), and in that the two transceiver arrangements (2, 3) have a receiver (6), a controllable and codable transmitter (8) and an evaluation and control device (7) which is connected to the receiver (6) and is intended to evaluate the intensity and coding of the received signal beam (4, 5) and to control the intensity and coding of the emitted signal beam (4, 5), the coding being effected using an item of information relating to the intensity of the received signal beam (4, 5).
A method for operating a light barrier in which signal beams (4, 5) are emitted between two ends (A, B) of its signal path (1), wherein a transceiver arrangement (2, 3) is arranged at both ends (A, B) of the signal path (1), in that the two transceiver arrangements (2, 3) emit a signal beam (4, 5) and receive the signal beam (4, 5) emitted by the other transceiver arrangement (2, 3), in that the two transceiver arrangements (4, 5) determine the signal intensity of the received signal beam (4, 5) and provide their own emitted signal beam (4, 5) with coding using the received signal intensity, and in that the two transceiver arrangements (2, 3) set the intensity of the signal beam (4, 5) emitted by them on the basis of the coding in the received signal beam (4, 5).
Dependencies are inferred from the claim text.