Photoelectric proximity detector and switch

Details Photoelectric proximity detector and switch Photoelectric proximity detector and switch

1990-09-05

1992-04-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214B, G06M 700

Patent

active

051030853

ABSTRACT:
A reflection-type photoelectric proximity detector and switch is capable of detecting the incremental and binary proximity of a finger through several layers of glass, cancelling out extraneous reflections and stray sources of radiation. The circuitry includes a modulated infrared emitter, an infrared detector, an optical barrier, an infrared filter, a bandpass filter, a signal rectifier, a biasing circuit to remove unwanted detected modulated signal, an amplifier, an incremental proximity output, a comparator, a detection reference, and a binary proximity detect output. In one embodiment a multitude of photoelectric proximity switches are installed on the inside of a store window, detect finger proximity from outside the window, and control electric appliances inside the store window. From outside the window, a user can select what is displayed inside the window.

REFERENCES:
patent: 3340401 (1967-09-01), Young
patent: 3621268 (1971-11-01), Neckarhausen et al.
patent: 3937952 (1976-02-01), Ripley et al.
patent: 4068222 (1978-01-01), Treviranus
patent: 4306147 (1981-12-01), Fukuyama et al.
patent: 4340813 (1982-07-01), Sauer
patent: 4724312 (1988-02-01), Snaper
patent: 4879461 (1989-11-01), Philipp
"Application Considerations for All-Material Proximity Sensors" Micro Switch, A Honeywell Division PK 8287 1 (not dated).
"Triple Beam Range Measurement Photoelectric Sensor" Aromat (not dated).

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