Photo-electric object detector having removable field stop means

Details Photo-electric object detector having removable field stop means Photo-electric object detector having removable field stop means

1984-12-10

1987-03-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237R, 340556, G01V 904, G06M 700, H01J 4014

Patent

active

046492704

ABSTRACT:
A pulsed LED photoelectric control apparatus operates in both the proximity mode and the retro-reflective mode. Field stop elements are manually inserted for operation in the retro-reflective mode and are quickly and readily removed for operation in the proximity mode in order to enable the same photo-electric control apparatus to be utilized in both modes.

REFERENCES:
patent: 3825747 (1974-07-01), Thomson
patent: 4029957 (1977-06-01), Betz et al.
patent: 4306147 (1981-12-01), Fukuyama et al.
patent: 4335316 (1982-06-01), Glanz et al.
patent: 4507557 (1985-03-01), Tsikos

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