Reflection-type photoelectric switching apparatus

Details Reflection-type photoelectric switching apparatus Reflection-type photoelectric switching apparatus

1979-12-31

1981-12-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237R, 250239, G01V 904

Patent

active

043061478

ABSTRACT:
Reflection-type photoelectric switching apparatus comprising a housing having a transparent front window, a light projecting device, a light receiving device arranged in side-by-side relation with the light projecting device, the light projecting and receiving devices enclosed in the housing and in a predetermined space between the devices and the front window, an optically opaque screen having a pair of transparent portions corresponding to said light projecting and receiving devices, said screen being slidably disposed in said predetermined space, an adjusting mechanism controllable from outside of the housing for driving said screen to continuously adjust an effective area of said pair of transparent portions thereof, so that a detection field defined by a common zone, in which the projected and reflected light ray bundles are crossed, is continuously variable with said adjusting mechanism.

REFERENCES:
patent: 3002420 (1961-10-01), Willits et al.
patent: 3578978 (1971-05-01), Laurent
patent: 3697762 (1972-10-01), Kurtz
patent: 4207464 (1980-06-01), Fukuyama et al.

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