| 摘要 |
<p>PURPOSE: To miniaturize a door lock controller by integrating an ignition key with a transmitter and constituting it in such a state as transmitting a code signal without pushing down a transmission switch. CONSTITUTION: When a transmitter 1 integrated with an ignition key 3 is brought in contact with a door handle 13, noise is transmitted to a trigger pulse detector 22 via a high-pass filter 21. Secondly, when a signal exceeds a threshold level, a one-shot timer 23 is driven, a low frequency transmitter 24 generates a low frequency signal and the signal amplified by a power amplifier 25 is transmitted to a power transmission coil 16. Thirdly, the transmitter 1 obtains a DC voltage, the voltage is transmitted to a code generation means and a high frequency output means as a power source, and preset code signal is modulated to be transmitted to a handle 13. A high frequency signal is transmitted to the filter 21 to be demodulated in a receiver part 27 and, when the received signal coincides with the code preset by a code setting part 29, a lock/ unlock drive 31 actuates a door lock motor 32.</p> |
