| 摘要 |
<p>PURPOSE: To facilitate manufacture of a central door lock system by enabling it to drive a remote control device through either radio frequency or optical frequency. CONSTITUTION: A central door lock system comprises a remote device 2, comprising a transmission device 3, a receiver device 4 and a decoder 6 and a controller 9 for controlling a door lock device 1 on the basis of an operation signal from the decoder 6. For making a key 10 act as a signal key, a coder device 5 is attached to it, and modulatable oscillators 7a, 7b activated selectively by a radio frequency or a light frequency is connected to the coder device 5. The decoder 6 is provided with tuning detectors 8a, 8b, corresponding to the radio frequency or the light frequency, and the detectors are selectively connected to the decoder device 6.</p> |
