Safety electronic coded lock with built-in ultrasonic piezoelectric vibrator array

The invention relates to the technical field of antitheft devices, in particular to a safety electronic coded lock with a built-in ultrasonic piezoelectric vibrator array. The safety electronic coded lock comprises a key, a lock cylinder, a lock body and an ultrasonic piezoelectric vibrator. The ultrasonic piezoelectric vibrator is a bent disc type composite vibrator formed by bonding a piezoelectric ceramic disc and a metal disc. The ultrasonic piezoelectric vibrator and a signal processing circuit are additionally arranged below a spring of a common lock. In the key inserting process, the ultrasonic piezoelectric vibrator suffers from pressure deformation of the spring to generate piezoelectric voltage, the piezoelectric voltage passes through the signal processing circuit, then the lock is opened, or sound-light alarming is carried out. The experiment verifies that the safety electronic coded lock is convenient to use, high in precision, high in reliability of lock body, capable of effectively preventing thief spying and good in antitheft effect.