MOTOR-DRIVEN ANTENNA DEVICE

摘要

A motor-driven antenna device in which an antenna element (10) has a short protruding length so that the outer dimension of the entire device is reduced, and in which damping of an AM-band signal by a signal path is restrained with a small stray capacitance. A rack cord (12) to be meshed with a pinion gear (24) is connected to a proximal portion of the antenna element (10) made of a helical coil over its entire length, and the antenna element (10) is caused to protrude and move to be housed by rotational driving of a motor drive section. The rack cord (12), the motor drive section and the pinion gear (24) are housed in a case (14), and a guide (26) to which the rack cord (12) is abutted and moves while bending is provided in the case (14). Thus, the rack cord (12) is abutted and moves to the guide (26) by the movement of the antenna element (10). In a protruding state, a linear conductor (30) is extended from the proximal end of the antenna element (10) to penetrate an earth conductive fitting (16), and electrically connected with a connection conductive fitting (32) at a position not in contact with the earth conductive fitting (16). A feeder conductive fitting (34) elastically contacts and is electrically connected with the linear conductor (30). <IMAGE>