| 摘要 |
The invention relates to a method in an optically operated proximity switch. A transmitter means (8) is used to transmit a beam in a direction (9) into the environment. The detection zone on one hand and the background area on the other hand are monitored by receiving means (10, 12) in directions (11 and 13). In addition, processing means are used in the method by which the output signals of the receiving means (10, 12) are compared to monitor the situation in the detection zone. An object (KO) is detected by the processing means when the output signal of the first receiver means (10) monitoring the detection zones is changed in relation to the output signal of the second receiver means (12) monitoring the background. When the said change is ended, the phase of detection of the object (KO) is ended and the output signal of the first receiver means (10) is returned to a substantially original level. |
