Device for optically detecting the presence or absence of an obj

Details Device for optically detecting the presence or absence of an obj Device for optically detecting the presence or absence of an obj

1986-11-26

1989-02-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250214R, G01J 132

Patent

active

048088099

ABSTRACT:
A detection system including a radiation source and a radiation detector wherein the output of the radiation detector is positively fed back to the radiation source through a variable voltage/current controlling unit thereby providing a rapid and reliable detection signal on the current path for supplying a current to the radiation source. The variable voltage/current controlling unit may be, for example a parallel connection of a Zener diode or resistor and a bipolar junction transistor or FET controlled by the current output from the radiation detector. The radiation source part and the radiation detector part can be electrically connected to reduce the number of lead wires.

REFERENCES:
patent: 4194481 (1980-03-01), Leblanc et al.
patent: 4254364 (1981-03-01), Flint et al.
patent: 4270046 (1981-05-01), Werking
patent: 4365164 (1982-12-01), Sibley
patent: 4629880 (1986-12-01), Zimmerman
patent: 4649267 (1987-03-01), Ray
patent: 4649302 (1987-03-01), Damiano et al.
patent: 4682061 (1987-07-01), Donovan
patent: 4687956 (1987-08-01), Itoh

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