ELECTRONIC LOCK Russian patent published in 2012 - IPC E05B49/00 

FIELD: electronic lock.

SUBSTANCE: electronic lock has (all the elements are placed at the security site): radio transmitter, in-series radio receiver, first multiplier, narrowband filter, second multiplier, first low-pass filter, in-series block of memory, correlator, threshold block and executive block, elements of turning on, as well as means for encoding. The second input of the first multiplier is connected to the output of the first low-pass filter. The second input of the second multiplier is connected to the radio receiver output. The executive block is kinematically connected to the mechanical lock. The elements of turning on are executed in the form of the mechanical lock with power switch, connected to the radio transmitter and the radio receiver. Means for encoding is placed outside the security object and is designed as a delay line on the surface acoustic wave, as the branches of which comb electrode systems of interdigital transducer of the surface acoustic waves and reflective grids are used; they represent piezocrystal coated with aluminum thin-film transducer and a set of reflectors. The transducer is connected to the microstrip transceiver antenna which is also made on the surface of the piezoelectric crystal. The lock is equipped with the third and the fourth multipliers, with two phase shifters at +90°, the phase shifter at -90°, the second and the third low-pass filters and two subtractors. To the output of a narrowband filter the following elements are in-series connected: the first phase shifter at +90°, the third multiplier the second input of which is connected to the radio receiver output, the second low-pass filter, the first subtractor, the second phase shifter at +90° and the second subtractor the second input of which is connected to the output of the first low-pass filter and the output is connected to the second input of the correlator. To the output of a narrowband filter the following elements are in-series connected: the first phase shifter at -90°, the fourth multiplier the second input of which is connected to the radio receiver output and the third low-pass filter the output of which is connected to the second input of the first subtractor.

EFFECT: increased reliability and noise immunity of the electronic lock.

1 dwg, 2 dwg