OPTICAL LOCKING DEVICE Russian patent published in 2005 - IPC

FIELD: optical locking devices.

SUBSTANCE: device has key with at least one optical information carrier and body with guides for insertion of key. Body has optical emission source for lighting optical carrier of key information, optical code transformation device for correlation comparison of wave code information formed by carrier to optical information, recorded in optical code transformation device, and emission receiver for registration of emission, coming from optical code transformation device. Optical carrier of key information and appropriate optical code transformation device are made in form of synchronous holograms with local adjustments of complex diffraction coefficient, appropriate for distribution of intensiveness in interference picture for two waves. One of two waves, registered on each of two aforementioned holograms, is made encoded by one and the same optical code and in hologram plane is characterized by anisotropic autocorrelation function, width of which along one of orthogonal axes is substantially greater, than its width along another orthogonal axis. Guides for inserting key are made with possible mutual displacement of optical key information carrier and optical code transformation device only in one direction, in which width of autocorrelation function of wave, registered on optical key information carrier, is minimal. Optical key information carrier can be made of material, nontransparent in ultraviolet and visible ranges of spectrum.

EFFECT: higher efficiency, lower costs.

5 cl, 4 dwg