Optoelectronic sensor

Details Optoelectronic sensor Optoelectronic sensor

2005-09-13

2005-09-13

Porta, David (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S2140LS, C340S555000

Reexamination Certificate

active

06943338

ABSTRACT:
The invention relates to an optoelectronic sensor, in particular a reflection light scanner, at least comprising a transmitter for transmitting transmitted light, a receiver for outputting at least two received signals in dependence on reflected and received transmitted light, and an evaluation device by which, for determining whether an object or no object is disposed in a detection zone of the sensor, a difference of the received signals is comparable with a threshold and a positive or negative article detection signal can be produced in dependence on the result of this comparison, with a plurality of different thresholds being provided to produce a switching hysteresis. The evaluation device is made such that the result of a comparison of a sum of the received signals with a threshold value is provided as an additional criterion for the production of the article detection signal. The invention further relates to a corresponding method.

REFERENCES:
patent: 4803373 (1989-02-01), Imamura et al.
patent: 5008529 (1991-04-01), Nakamura
patent: 6215116 (2001-04-01), Van Marcke
patent: 19808215 (1999-09-01), None
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patent: 01-170886 (1989-07-01), None
English translation of DE-20003675.
English translation of DE-19852173.

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