Photoelectric sensor for securing the safety of a work area

Details Photoelectric sensor for securing the safety of a work area Photoelectric sensor for securing the safety of a work area

2008-05-05

2009-10-06

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S206100, C340S555000

Reexamination Certificate

active

07598484

ABSTRACT:
A photoelectric sensor according to the present invention, performs a determination as to whether or not an object is present in a predetermined detection area and provides (1) a enable signal to enable operation related to a hazardous source and (2) a disable signal to disable the operation based on a result of the determination. The photoelectric sensor determines whether or not the object is present within the predetermined detection area and whether or not the object is present at a reference point which is a different location within a measurement area from the predetermined detection area, based on a position information; and provides the enable signal when the object is absent from the predetermined detection area but the object is present at the reference point, and provides the disable signal when the object is present within the predetermined detection area and the object is absent at the reference point.

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