Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Load control
Patent
1988-07-18
1991-01-08
Ro, Bentsu
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Load control
318266, 318286, 318468, G05B 106
Patent
active
049838920
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a mechanism for controlling an electrically driven antenna. A motorized antenna control mechanism automatically extends and contracts an antenna connected to a wireless or radio receiver and transmitter installed in an automobile. A mechanism for controlling the electrically driven antenna is operatively connected with the function of ON/OFF functions of the wireless or radio receiver as to freely extend and contract the antenna.
According to the present invention, simplicity of construction, is achieved, for example, by having a drive motor for a motorized connection driven by a two-wire connection. Also the device is relatively easy to install to the car body without any adverse effects of humidity, dust, and temperature condition or the like. Also mechanism does not suffer from effects of problems of the antenna, such as abnormal efficiency and deterioration of the power source.
2. Background Art
It is known that there are motorized antenna devices retractable by means of a driving device, such as a motor. According to the conventional motorized antenna device the antenna is actuated through a change-over switch situated in a motor vehicle interior. The switch is separate from the switch of a radio receiver, so that a power source is connected to the motor of the antenna.
In recent improved antenna devices, there are limit switches operate in response to the extension and retraction movements of the drive mechanism of the device. The extension and retraction movements of the device can be started automatically by ON-OFF operation of a radio equipped in a motor vehicle.
According to the prior art, a means other than that for operating the transmitter/receiver is used. A change over switch is placed in the car interior to which switch a power-to-motor supply cord of the motorized antenna and the changeover switch is operated in manual. Also a limit switch operated by rotation of the motorized antenna drive portion had been built-in the drive portion. The mechanical conventional motorized antenna portions automatically extend and contract by ON/OFF operation of the radio apparatus and stop by means of limit switches. The prior art is descrived, for example, in Japanese documents, Utility Model Publication Sho. No. 43-17546, Utility Model laid-open Sho. No. 50-54038, Utility Model laid-open Sho. No. 56-74505, and Patent Publication Sho. No. 60-57242.
Japanese Documents, Utility Model laid-open Sho. Nos. 49-145544 and 57-171336 disclose obtaining pulse signals from a motorized antenna drive portion which is controlled automatically by an electronic circuit which in controlled in time and leg function of extending and extracting by means of a built-in timer circuit.
In every mechanism of the above-mentioned prior art, a control mechanism is installed in the antenna drive portion or integrated in the motorized antenna. Accordingly, the antenna drive portion and the motorized antenna portions are very complicated. Furthermore, the controller, which is built in the antenna portion is apt to be affected by rain drops, deteriorating the switch operation.
The conventional electronic-controlled antenna has a disadvantage of error-functioning because of the effects of outside noise and electronic parts in the automobile. Also, the parts constituting the electronic control mechanism are expensive, electronic circuits are complicated and of high quality, manufacturing of them is difficult. Except for ones of a manual switch types or electronic control types, the extension length of the antenna corresponds to the distance determined by the built-in switch exclusively. Accordingly, a convenient value of extension suitable to respective receiving condition or any necessity can not be obtained.
Because the control means is driven by the same motor as that used for extending and contracting the antenna, when the antenna mal-functions is over-loaded, or frozen the control means stops, which causes a burn-out of the motor. When the charging performance of a battery dro
REFERENCES:
patent: 4203059 (1980-05-01), Kraus
patent: 4338552 (1982-07-01), Pilz et al.
patent: 4514670 (1985-04-01), Fassel et al.
Suga Mitsuhiro
Takizawa Akio
Nippon Antenna Co. Ltd.
Ro Bentsu
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