Alignment system using two photocells directed at each other

Details Alignment system using two photocells directed at each other Alignment system using two photocells directed at each other

1978-03-27

1980-01-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356152, 356400, G01B 1126, G01D 2104

Patent

active

041851927

ABSTRACT:
A passive optical switching apparatus for use with a sales display device, or with a secret security device or with a safety device. The apparatus includes two photo resistor systems which are positioned so that their optical axes and field of view intersect. Also included is the complementary electronic circuitry. If a light change occurs within the region defining the intersection a switching signal is created to trigger the device to which it is attached.

REFERENCES:
patent: 2595993 (1952-05-01), Templeman et al.
patent: 3527953 (1970-09-01), Chitayat
patent: 3534499 (1970-10-01), Chaffee
patent: 3885872 (1975-05-01), Howe, Jr. et al.
patent: 4059758 (1977-11-01), Wilwerding
patent: 4112309 (1978-09-01), Nakazawa et al.

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