| 摘要 |
<p>PURPOSE:To improve reliability by preventing any illegal operation on an electric lock device and dispensing with a built-in battery at the side of a key. CONSTITUTION:When an electronic key device 10 is set up in a lock side variable magnetic field formed by a lock side oscillator circuit 22 of an electronic lock device 20, electric power is fed to a key side oscillator circuit 13 from a power generator circuit 12 in this electronic key device 10, and the key side oscillator circuit 13 oscillates at plural different frequencies of sequent order based on a transmission side code signal of a key side storage means + or -4, thereby forming a key side variable magnetic field. In this case, this variable magnetic field is received by a receiver circuit 23 in the electronic lock device 20 and demodulated by a demodulator circuit 24, whereby the frequency at the key side variable magnetic field is detected. In succession, the output of this demodulator circuit 24 is compared with the frequency of a receiver side code signal of a lock side storage means 25 by a lock side control circuit 26, and when the key side variable magnetic field is made up of an electronic key code containing plural different frequencies, this lock control circuit 26 feeds its output to a controlled body 27.</p> |
