JP2001060815A - Antenna core for portable telephone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antenna core small in the limit radius of curvature causing permanent bent and suitable for a portable telephone. SOLUTION: In this antenna core for portable telephone formed of a metallic deformed wire and a rectangular wire in a coil shape, it is desirable that the cross section of the deformed wire or the rectangular wire is from 0.03 to 0.3 mm2, that the tensile strength is between 1000 and 2600 N/mm2, and that the coil outer diameter is between 0.5 and 2.0 mm. A single or a plurality of coil deforming parts are preferably provided in the terminal of a contact coil or in the middle. In the antenna core 12 using metal of a deformed cross section and the rectangular wire, the permanent bent is hardly caused, material costs are inexpensive and working is so easy that the antenna core 12 can easily be made since the core 12 is wide and thin and its tensile strength is high, and the core 12 can also be used as an antenna for a transceiver, a radio and a television set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna core for a portable telephone having a small radius of curvature at which permanent bending occurs.

[0002]

2. Description of the Related Art In the case of an antenna core for a mobile phone using a special material such as a Ni alloy or a Ti alloy, a single straight line is usually used. The difference in the outside distance was extremely large compared to the present invention, and there was a drawback that permanent bending was apt to occur. In addition, the weight was large, and the processing required heat treatment and the like as a pre-process of header processing, resulting in high cost.

[0003] The pipe type antenna has a drawback that the deformation of the material is not easily restored to the bending, and the permanent bending is likely to occur.

An improvement in the antenna core using a single straight line is to make the diameter of the line thinner and to reduce the difference between the inner and outer distances of the radius of curvature, but it is difficult to hold the antenna core at the same time. There was a drawback that it was hard to use because it would break when stored.

[0005]

The problem to be solved is that the critical radius of curvature at which permanent bending occurs is large.

[0006]

SUMMARY OF THE INVENTION The present invention uses a metal having a high tensile strength, irregular cross section and rectangular wire, and makes it a helical contact coil, thereby reducing the number of antennas in comparison with a conventional antenna using a single straight line. If a material with twice the length is used and bending under the same conditions as a conventional antenna is given, a metal with an irregular cross section and a flat wire will be subjected to a bending load of a fraction and a little torsional load. Permanent bending is less likely to occur than a conventional antenna core using a straight line.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An antenna core using a metal having a deformed cross section and a rectangular wire is realized instead of an antenna core using a single straight line.

[0008]

FIG. 1 is an overall view of the apparatus of the present invention.
Is an enlarged cross-sectional view of the antenna shown in FIG. 1, and FIG. 3 is a cross-sectional view of a coil using a deformed wire obtained by continuously rolling or die-drawing a wire having a circular cross section.

[0009]

As described above, an antenna core made of a metal having a deformed cross section and a rectangular wire has a wide width, a small thickness, and a high tensile strength. It can be made lightly and can be used as a transceiver, radio, or TV antenna.

[Brief description of the drawings]

FIG. 1 is an overall view of a telephone main body 2, an antenna core 3, a plastic cover 4, and a deformation part of the antenna core.

FIG. 2 is an enlarged view of a front end using the flat wire of FIG. 1;

FIG. 3 is an enlarged view of an antenna core using a deformed wire 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Telephone main body 2 Antenna core 3 Plastic cover 4 Deformation part of antenna core 5 Cross section of coil using deformed wire

Claims (2)

[Claims] 1. An antenna core for a cellular phone, wherein a metal deformed wire and a rectangular wire are coiled. 2. The sectional area of the deformed wire and the flat wire is 0.03 mm.
² to 0.3 mm ² , tensile strength 1000 N / mm ² to 2600 N / mm ² Coil outer diameter 0.5 mm to 2.0
mm, mobile phone antenna core provided with one or more coil deformation parts at the end of the contact coil or at the center