Electronic lock

Details Electronic lock Electronic lock

1980-04-24

1983-01-18

Miller, J. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361172, 70DIG51, H01H 4700

Patent

active

043694810

ABSTRACT:
A lock comprising a laser adapted to emit a beam of light along a given path. A plurality of photo-diodes are electrically connected together and located at spaced apart positions defining a unique pattern. A key having a light reflecting means is adapted to be located in the path of the laser beam. The reflecting means when located in the laser beam path reflects light back to the photo-diodes in the unique pattern to cause the lock to be unlocked. In another embodiment, the photo-diodes are located in an array which is scanned to determine if light is reflected from the reflecting means of the key in a unique pattern.

REFERENCES:
patent: 3564500 (1971-02-01), Cook
patent: 3769514 (1973-10-01), Clark, Jr.
patent: 3896345 (1975-07-01), Zink
patent: 4091271 (1978-05-01), Jones et al.
Mestre, A. F., "Switching Circuit Employing Photo-Diodes," IBM Tech. Disclosure Bulletin, vol. 3, No. 1, Jun. 1960.

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