OPTOELECTRONIC LOCK Russian patent published in 1997 - IPC

FIELD: locking devices. SUBSTANCE: lock has optical key and N photoreceivers with their outputs connected to operating device through comparative device. Key hole of lock is in the form of two strips. Source of radiation is in the form of N singular infra-red radiation emitters installed in passages of first strip. Photoreceivers are installed in passages of second strip. Number of passages S in each strip is higher or equal to N. Key is made as a strip of material impenetrable to infra-red radiation. Strip has through-holes and their number is R <N. Strip with holes is positioned between two strips made of material with its coefficient of passing for infra-red radiation is larger than for visible range of radiation. EFFECT: higher efficiency. 2 dwg