Title: Light barrier system

Abstract: A light barrier system is provided which includes a light transmitter, a light receiver to receive the light beam transmitted over a predetermined path, an indicator unit which is connected to the light receiver and produces a signal when an obstacle is detected in the path, and a power unit supplying the light transmitter, light receiver and indicator unit. The power unit consists essentially only of a rectifier. A pulsed light source is employed, operated by the discharge of a capacitor in the rectifier output.

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Inventors: Walter, Arthur (Denzlingen, DT)
Erdmann, Jurgen (Buchholz both of, DT)

Application Number: 604215
Filing Date: 1975-08-13
Publication_date: 1977-03-15
Assignee: Erwin Sick Optik-Electronik (Waldkirch, DT)
Primary Class(es): 250/221 340/674
Other Classes:
US Patent Ref:

3605082	Sep, 1971	Matthews	340/258.
3711846	Jan, 1973	Schlisser et al.	250/221.
3723737	Mar, 1973	Zeldman et al.	250/221.
3859647	Jan, 1975	Ross	340/258.
3898588	Aug, 1975	Skagerlund	315/241.
3914753	Oct, 1975	Cho	250/221.

Other Refs:
Primary Examiner: Nelms, David C.
Assistant Examiner:
Attorney: