ELECTRO-OPTICAL LOCK Russian patent published in 2005 - IPC

FIELD: locks for limitation of access to private and industrial building.

SUBSTANCE: lock has key provided with light channels, power supply unit, microcontroller, control module which has indicator, switch and sonic oscillation piezoelectric radiator, N light irradiators and N photoreceivers. Door detector, stable current oscillator, harmonic oscillations generator and ac bridge, which is connected with bench mark circuit and measuring LC circuits, are introduced into the lock additionally. Output of first photoreceiver is connected with first input of microcontroller which has second input connected with output of second photoreceiver. Output of Nth photoreceiver is connected with third input of microcontroller. Key with light channels has material which is introduced additionally. It can be ferromagnetic, brass or steel core available in different sizes and ferromagnetic powder added to material of which the key is made. The material changes resonant frequency of measuring circuit; key blank having similar material is fastened to bench mark circuit. Lock shows improved reliability and degree of protection as well as increased resource of light-emitting members. Application of any duplicate of metal key is excluded as well as making of plastic duplicate of key.

EFFECT: higher degree of reliability; improved protection against robbery.

3 cl, 1 dwg