Motor driven extensible rod antenna for vehicles with position c

Details Motor driven extensible rod antenna for vehicles with position c Motor driven extensible rod antenna for vehicles with position c

1985-01-08

1987-03-10

Lieberman, E.

Communications: radio wave antennas

Antennas

Rod type

318603, H01Q 110, G05B 1929

Patent

active

046493980

ABSTRACT:
There is provided an electric antenna apparatus which is mounted on a vehicle such as an automobile, and in which the rotation of a DC motor drives and rotates a pinion through a reducing mechanism, and a cable coupled to the base end portion of an antenna rod is coupled to this pinion so as to come into engagement therewith. The cable is driven in its longitudinal direction due to the pinion, rotated in response to the rotation of the motor, and the antenna rod coupled to this cable is driven, thereby allowing the antenna rod to be extended or retracted. In this case, a magnetic disk, formed with a plurality of magnetic poles in its outer peripheral portion, is mounted to a worm wheel constituting the reducing mechanism so that the magnetic disk is rotated coaxially with the worm wheel. Also, a reed switch is attached to a circuit board set adjacent to the motor, thereby allowing a pulse-like signal from the reed switch to be detected in response to the rotation of the magnetic disk. A control circuit which constitutes a drive circuit to drive the motor and to which the pulse signal from the reed switch is supplied is installed in the circuit board. Due to this control circuit, the rotating state of the motor is controlled in response to an operation command, thereby allowing the antenna rod to be extended or retracted.

REFERENCES:
patent: 4542383 (1985-09-01), Cusey et al.

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