Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-03-14
2006-03-14
La, Anh V. (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C250S559400, C250S221000, C250S222100, C356S003000
Reexamination Certificate
active
07012539
ABSTRACT:
An optoelectronic sensor and a method for producing a positive or a negative object detection signal in dependence on the presence or non-presence of an object in a foreground region or in a background region of a region monitored by the sensor. Transmitted light is transmitted in the direction of the monitored region during an operating phase. A plurality of received signals are produced in dependence on the reflected and the received transmitted light which are associated with the foreground region or with the background region. A difference of the received signals is compared with a differential threshold to produce the positive or the negative object detection signal, wherein a switching hysteresis is formed for a change between the positive and the negative object detection signal. The association of the received signals with the foreground region and the background region is changed in dependence on a change in the object detection signal to form the switching hysteresis.
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Merettig Gerhard
Ringwald Siegfried
Waslowski Kai
La Anh V.
Sick AG
Townsend and Townsend / and Crew LLP
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