JPH1117436A - Plurally-wound loop antenna for pager - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain improvement in a cost in working an antenna, a mounting cost at the time of assembling and workability by fitting a plurally-wound antenna element in a connection state to a printed substrate and, after that, removing a connecting part by means of pressure work so as to execute formation. SOLUTION: This plurally-wound antenna element is formed by fitting plurally-wound antenna elements in the connection state where at least two planar loop antenna elements are partially connected in parallel by interval for arrangement on the printed substrate to the printed substrate and, after that removing the connecting part by press work. That is, the antenna 14 with an integrated structure where two planar single-winding antennas are connected in two places. Then, it is mounted on the printed substrate, the connecting part is removed by press work in a process immediatedly before a characteristic checking process so as to execute separation and, then, the plurally-wound loop antenna is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple-turn loop antenna used for a pager or the like, and more particularly, to a method of forming the loop antenna.

[0002]

2. Description of the Related Art Conventional pager antennas are roughly classified into the following four types by type. (1) Multi-turn loop antenna (2) Single-turn loop antenna (3) Flat plate antenna (4) Antenna with coil wound around the axis core of ferrite etc. All of these are carefully designed to make full use of the performance of the equipment itself It was done. Of the above four types, the multi-turn loop antenna to which the present invention is directed is, as shown in FIG. Make up the antenna. The multi-turn antenna has an advantage that an effective aperture area as an antenna is widened and the antenna gain is high as compared with the single-turn antenna.

On the other hand, as the shape of a single-turn loop antenna, as shown in FIG. 2, there are an antenna formed by processing from a flat plate, and as shown in FIG. 3, an antenna formed by a wire. If you devise, there is no big difference in performance. Therefore, the present invention is directed to a loop antenna formed by processing from a flat plate.

[0004]

However, the multi-turn antenna having the above-described structure has higher material and processing costs, higher mounting costs, and higher assembly costs than those formed by a single-turn loop antenna. However, there are drawbacks such as difficulty in positioning.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multiple-turn loop antenna in which the function and performance of the multiple-turn loop antenna are ensured, and the antenna processing cost, the mounting cost during assembly, and the workability are improved. It is in.

[0006]

According to the present invention, there is provided a multi-turn loop antenna in which at least two planar loop antenna elements are partially connected in parallel at intervals to be arranged on a printed circuit board. After attaching the element to the printed circuit board, the element is formed by removing the connecting portion by press working.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention employs the following technical means to solve the above-mentioned problems.
4 to 7 are perspective views showing the progress of processing by the construction method of the present invention. That is, as shown in FIG. 4, an integrated antenna 4 in which two flat single-turn antennas are connected at two locations is formed, and this is mounted on the printed circuit board 1 as shown in FIG.
In a process immediately before the characteristic checking process, the connected portion is removed by press working and separated to form a multi-turn loop antenna.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 4 shows the multiple-turn antenna 4 in a connected state before being mounted on a printed circuit board. FIG. 5 shows a state in which the multiple-turn antenna 4 in the connected state shown in FIG. Because of the connection, the need for only one mounting operation, the ease of handling as a part, the good sitting, etc. lead to the improvement of workability.

FIG. 6 is a view in which a punch 5 and a die 6 for press working are arranged to separate a connecting portion after being mounted on the printed circuit board 1. The connecting portion is removed by the punch 5.
FIG. 7 is a diagram showing a state in which the connecting portion has been separated and a multiple-turn loop antenna is finally formed. The two loop antennas 2 are connected by a printed wiring of the printed circuit board 1 so as to have a plurality of turns. In addition, although a trace of press working remains on the fracture surface of the portion where the connecting portion is cut by the punch 5, this does not pose a problem in practical use.

In the above, a multi-turn loop antenna in which two single-turn loop antennas are connected has been described as a representative. It is needless to say that the same operation can be performed even when three units are connected.

[0011]

By implementing the present invention, there are the following advantages as compared with the conventional configuration in which a plurality of single-turn loop antennas are individually arranged and mounted on a printed circuit board to form a multi-turn loop antenna. (1) Processing cost is low because only one processing is required. (2) Material yield is improved. (3) Since only one mounting is required, the effective cost is low. (4) Good seating during mounting and high shape stability.

[Brief description of the drawings]

FIG. 1 is a perspective view of a conventional multiple-turn antenna formed by mounting two single-turn loop antennas on a printed circuit board.

FIG. 2 is a perspective view of a single-turn loop antenna (processed from a flat plate).

FIG. 3 is a perspective view (processed from a thin line) of a single-turn loop antenna.

FIG. 4 shows a multi-turn loop antenna 4 in a connected state according to the present invention.
It is a perspective view of the element of FIG.

FIG. 5 is a perspective view of the connected multiple-turn loop antenna of the present invention mounted on a printed circuit board.

FIG. 6 is a perspective view of an intermediate configuration of the present invention, showing a state immediately before cutting a connecting portion of a multi-turn loop antenna in a connected state.

FIG. 7 is a perspective view of the multiple-turn loop antenna of the present invention in which a connecting portion is separated and a final state is shown.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 printed board 2 single-turn loop antenna (flat plate) 3 single-turn loop antenna (linear) 4 multiple-turn antenna in connected state 5 punch for press shearing 6 die for press shearing

Claims (1)

[Claims] 1. A method according to claim 1, further comprising: attaching a plurality of connected plural-turn antenna elements, in which at least two planar loop antenna elements are partially connected in parallel at an interval to be arranged on the printed board, to the printed board; A multiple-turn loop antenna for a pager, which is formed by removing a portion by press working.