| 摘要 |
<p>PURPOSE:To execute the transmission operation of a transmission circuit even when the power supply of the transmission circuit is all used up. CONSTITUTION:A key 10 capable of being inserted into a key cylinder is provided with a transmission circuit 33, lock and unlock switches 35 and 36, secondary battery 37 as power supply, and a secondary coil 38. The circuit 33 usually uses the secondary power supply 37 as its power supply, and performing transmission operation based on the operation of the switches 35 and 36. In the case the power of the secondary power supply 37 is all used up, the primary coil on the key cylinder side is energized and controlled when the key 10 is inserted into the key cylinder. Based on the change of the current flowing through the primary coil, induction electromotive force is created in the secondary coil 38. Based on the electromotive force, an unlock signal is automatically outputted from the circuit 33.</p> |
