Photoelectric switch

Details Photoelectric switch Photoelectric switch

2007-07-17

2007-07-17

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

Reexamination Certificate

active

11362355

ABSTRACT:
A projection head of a photoelectric sensor includes a first monitoring light receiving device for receiving a part of a light that the light projecting device emits, and a projected light quantity controlling device for executing a control such that a first monitor signal obtained by the first monitoring light receiving device is kept constant to maintain a quantity of projected light of the light projecting device at a predetermined value. Also, a controlling portion of a controller senses an abnormality of the projection head based on a monitor signal obtained from the first monitoring light receiving device to be monitored via the head cable, and suppress a light projected from the light projecting device. The separate type photoelectric switch, in which the projection head is separated from the controller, is constructed such that the abnormality of the projection head can be monitored on the controller side.

REFERENCES:
patent: 7002128 (2006-02-01), Hedin et al.
patent: 7098441 (2006-08-01), Yamaguchi et al.
patent: 2003/0136895 (2003-07-01), Ogawa
patent: A-2003-086830 (2003-03-01), None

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