| 摘要 |
<p>PURPOSE: To provide a keyless security device automatically stopping the action of the receiving module of an on-vehicle receiver during the use of an automobile so as to eliminate the generation of radiated interfering elements from the receiving module. CONSTITUTION: A switching means 216 is provided between the receiving module 12 of the on-vehicle receiver 10 of a keyless security device and the power circuit of the receiving module 12, and the switching means 16 is opened at the time of insert operation of the automobile key so as to stop the supply of power to the receiving module 12. Accordingly, the action of a local oscillator in the receiving module 12 is also stopped, so that interfering noise elements such as the fundamental wave frequency of a local oscillation signal generated by the local oscillator, and its secondary higher harmonic frequency and tertiary higher harmonic frequency are not radiated from a receiving antenna 11, nor are these interfering noise elements mixed into other on-vehicle equipment in use.</p> |
