Object sensor system for doors

Details Object sensor system for doors Object sensor system for doors

1995-11-06

1998-04-14

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340555, G08B 13184

Patent

active

057395233

ABSTRACT:
A light-emitter emits light, and a plano-convex condenser lens focuses the emitted light and projects the focused light onto a floor near a door to thereby establish a sensing area. A plano-convex light-receiving lens focuses light reflected from the sensing area, and a light-receiver receives the focused, reflected light. The plano-convex lenses have edges closer to the door which is substantially straight.

REFERENCES:
patent: 4097733 (1978-06-01), Langenbach et al.
patent: 4479053 (1984-10-01), Johnston
patent: 4605850 (1986-08-01), Anselment et al.
patent: 4713545 (1987-12-01), Norrgren et al.
patent: 5142152 (1992-08-01), Boiucaner
patent: 5410149 (1995-04-01), Winston, Jr. et al.
European Search Report for EP 95 11 7540 completed 22 Feb. 1996.

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