| 摘要 |
PURPOSE: To obtain a drawing out type antenna system to which a communication circuit built in either a whip antenna or a helical antenna only is conducted. CONSTITUTION: A connection terminal 23 connected to a communication circuit is mounted to a prescribed position of an upper side of a main body case 21 incorporating the communication circuit, a cylindrical cover 25 is fitted to an upper part of the connection terminal 23, and a helical antenna 24 is arranged in the cover so as to be compressed and modified. A pressure reception member 27 of an insulator is fitted to a lowermost part of the helical antenna 27 and the whip antenna 26 is moved axially an coaxially with the helical antenna 24. When the whip antenna 26 is extended, a push-up part 28 is abutted against the pressure reception member 27 to lift up the helical antenna 24 and to part the helical antenna 24 from the connection terminal 23 and only the whip antenna 26 is conducted to the communication circuit. In the case of containing the antenna, the helical antenna 24 is returned elastically and brought into contact with the connection terminal 23 and only the helical antenna 24 is connected to the communication circuit.
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