JPS59203A - Motor-driven expansion antenna provided with antifreezing device - Google Patents

Abstract

PURPOSE:To prevent freezing in the winter season, by thawing the freezing of an antenna element and a cylindrical storing part by a heating layer. CONSTITUTION:A motor-driven expansion antenna is installed to a fender of an automobile, etc. by its upper end fitting part 7. When a motor 8 is rotated by electrification, an antenna element 1 contained in a cylindrical containing part 17 is pushed by a bush ram 6 incorporated in a bush lot drum 9 and expands. A heating layer 3 is formed by applying graphite. As for an outside cylinder 4, a glass fiber, etc. which are excellent in its insulation and has a high adiabatic property are used. The heating layer 3 is divided into two parts, the upper and lower parts, and a current flows to only the lower heating layer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates primarily to an electric telescoping antenna that is attached to an automobile.

Conventional electric telescoping antennas do not have anti-freezing measures, so the antenna element and cylindrical housing are prone to freezing in extremely cold regions. Otherwise, there was a risk that the drive motor would burn out.

An object of the present invention is to provide an electric telescoping antenna that solves the above-mentioned drawbacks of the prior art and can prevent freezing in winter or automatically thaw in conjunction with the operation of a car even if it freezes. There is a particular thing.

In order to achieve the above object, an electric telescopic antenna with an antifreezing device according to the present invention has a structure in which an antenna element is moved in and out of a cylindrical storage part by electric power, and the cylindrical storage part is connected to the antenna. A three-layer structure consisting of a high-rigidity insulator forming an inner cylinder that contacts the element, a heat-retaining insulator forming an outer cylinder, and a heat-generating layer inserted between the high-rigidity insulator and the heat-retaining insulator and connected to a circuit for energizing. It's Nishide.

According to the above structure, the antenna element and the cylindrical housing can be prevented from freezing, and the object of the present invention can be completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings and the like.

Fig. 1 is a front view showing one embodiment of the electric telescopic antenna according to the present invention, and Fig. 2 is a cross-sectional view of portion AA in Fig. 1.

The electric telescopic antenna shown in this figure is installed on the fender of an automobile or the like by means of the upper end mounting portion 7.

When the motor 8 rotates due to energization, the cylindrical storage portion 17
The antenna element 1 housed in the butschrodt drum 9 is pushed by the butschrodt 6 and extends. A cable 7'/I/ connected to the antenna element 1 is housed in the cable drum 10.

The inner tube 2 in contact with the antenna element 2 of the cylindrical storage portion 17 is made of FILP (glass reinforced plastic), which has high rigidity and good insulation properties.

The heat generating layer 3 is formed by applying graphite.

The outer cylinder 4 is made of glass fiber or the like having good insulation and high heat insulation properties. The heat generating layer 3 is divided into upper and lower halves, and current is passed through only the lower heat generating layer.

FIG. 3 is a partial perspective view showing the cylindrical storage portion of FIG. 2 in more detail. One end of the lead terminal 5 coming out from the lower heating layer 3a is connected to the ground, and the other end is connected to the +12V terminal of the automobile battery via a switch or the like (a circuit for energizing).

FIG. 4.5 is a circuit diagram showing an embodiment of the circuit for supplying current.

Figure 4 shows an example of the device being linked to an automobile's hot-wire window circuit.
11 is a battery, 12 is a switch, 13 is a fuse, 1
4 represents a window hot wire heater, and 3 represents a heat generating layer. When the switch 12 is turned on, current flows through the heating layer of the antenna as well as the hot wire heater.

Normally, if the windshield is frozen due to moisture such as frost, an electric telescopic antenna under the same conditions will also be frozen, so at least if the electric telescopic antenna is designed to thaw quickly, it will be difficult to operate the windshield. The operator can turn off the switch 12 by checking the degree of defrosting of the window, so the heating layer 3
This prevents unnecessary power consumption.

FIG. 5 shows an example of using a low temperature sensor for automobile emission control, where 15 indicates a relay and 16 indicates a low temperature sensor. Other symbols are the same as those shown in FIG. 4 with the same symbols.

When the water temperature at the bottom of the radiator is low, for example below 10° C., the system stops exhaust gas recirculation to compensate for the drop in power performance due to the low temperature of the vehicle.

Therefore, when the water temperature is low, the relay 15 is turned on at the same time as the engine is started, and current flows through the heat generating layer 3. When the water temperature rises above a predetermined temperature, relay b is automatically turned off and the current is cut off.

In this example, the low temperature sensor 16 is linked to a system that constantly monitors the temperature of the outside air, so even if the temperature suddenly drops while driving, it will follow it and prevent the electric telescoping antenna from freezing. can.

The external appearance of the electric telescoping antenna with an antifreeze device according to the present invention is the same as that of the prior art, as shown in FIG.
It is compatible when attached to the fender of an automobile, and is easy to manufacture because the structure is simple to pass through in cross section in Figure 2.

As is clear from the above explanation, according to the first invention, the heat generating layer can thaw or prevent the antenna element and the cylindrical housing from freezing, so even in areas where the temperature is below freezing, the car can receive radio reception and communicate wirelessly. If you do it well, it will have a great effect.

[Brief explanation of the drawing]

Fig. 1 is an external view of an electric telescopic antenna with an antifreeze device according to the present invention, Fig. 2 is a partial cross-sectional view of the antenna shown in Fig. 1, and Fig. 3 is an embodiment of the heat generating layer of the electric telescopic antenna according to the present invention. A schematic perspective view, FIG. 4, and FIG. 5 are circuit diagrams each showing an example of a circuit for supplying current. 1... Antenna element 2... Cylinder 3... Heat generating layer 4... Outer tube 5... Lead wire 6.
...Butschrot 7...Top end mounting part 8...
Motor 9...Butschrot drum 10...Cable drum 11...Battery 1
2...Switch 13...Fuse 14...
Heat ray window 15... Relay 16... Low temperature sensor 17... Cylindrical storage section Patent applicant NEC Corporation

Claims (4)

[Claims] (1) In an electric telescopic antenna having a structure in which an antenna element is moved in and out of a cylindrical storage part by electric power, the cylindrical storage part is connected to a highly rigid insulator forming an inner cylinder that contacts the antenna element and an outer An electric telescopic antenna with an anti-freeze device, characterized by having a triple structure of a heat-retaining insulator serving as a cylinder, and a heat-generating layer inserted between the high-rigidity insulator and the heat-retaining insulator and connected to a circuit for energizing. . (2) The electric telescopic antenna with an antifreeze device according to item 1, wherein the heating layer is divided into two in the length direction, and a circuit for energizing the lower divided heating layer is connected. (3) The electric telescoping antenna with an anti-freezing device according to the first or second item, wherein the circuit for energizing operates in conjunction with a circuit for a hot wire window of the own train. (4) The electric telescoping antenna with an antifreeze device according to the first or second item, wherein the circuit for energizing operates in conjunction with a low temperature sensor of an automobile's emission control system.