Antenna and its manufacturing method

Communications: radio wave antennas – Antennas – With radio cabinet

Reexamination Certificate

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Details

C343S901000

Reexamination Certificate

active

06268830

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an antenna and particularly relates to an antenna used in portable wireless devices such as portable telephones, PHS (Personal Handyphone System) and the like.
BACKGROUND OF THE INVENTION
In recent years, such portable wireless devices as portable telephones, PHS and the like are widely in use. These devices are equipped with an antenna for receiving and transmitting radio waves. This antenna is formed of a first antenna element that is made operative when the antenna is extended and a second antenna element that is made operative when the antenna is retracted into the wireless device's case for the convenience of portability.
A conventional type of the antenna as mentioned above will be described in the following with reference to FIG.
7
and FIG.
8
:
FIG. 7
is a cross-sectional view of a prior art antenna.
In
FIG. 7
, the bottom end of a first antenna element
1
is coupled with a stopper
3
formed of an electrically conductive metal and the upper part of the first antenna element
1
is fixed to a cylindrical column like joint
4
formed of an insulating resin and provided with screw threads
4
A around the periphery of its top end. In addition, a tube
2
formed of an insulating resin is used to cover the periphery of the first antenna element
1
. The first antenna element
1
is formed of a linear metallic round wire.
A second antenna element
5
is formed of such an electrically conductive metal as copper, copper alloy or the like and structured like a coil winding. The second antenna element
5
is wound around a bobbin
6
formed of an insulating resin.
A feeding fixture
7
is formed of an electrically conductive metal.
The bottom end of the second antenna element
5
is attached to the top end of the feeding fixture
7
by winding around it, thereby completing an electrical connection therebetween.
A cover
8
formed of an insulating resin covers the periphery of the second antenna element
5
. Screw threads
7
A are formed inside of the bottom end of the feeding fixture
7
and the screw threads
4
A of the joint
4
are screwed into the screw threads
7
A with an adhesive applied for the prevention of loosening of the joint
4
due to its rotation.
An antenna insertion hole
9
A and a spring insertion hole
9
B are formed in the center of an antenna holder
9
. Springs
10
contained in the spring insertion hole
9
B are pressed against the stopper
3
, which is coupled with the first antenna element
1
, and kept parallel in position with the axis line of the stopper
3
by a spring action. A feeding nut
11
connected with electric circuits (not shown in
FIG. 7
) of a wireless device is tightened to screw threads
9
C formed around the periphery of an antenna holder
9
. The antenna holder
9
is fixed to the case
12
of the wireless device. The antenna holder
9
is formed of an electrically conductive metal. The springs
10
are also formed of an electrically conductive metal.
When the antenna is extended as shown in
FIG. 7
, the stopper
3
is brought into contact with the springs
10
contained in the antenna holder
9
, which is attached to the case
12
of the wireless device, thereby enabling the first antenna element
1
connected electrically with the feeding nut
11
to transmit/receive radio waves via the antenna.
When the first antenna element
1
is retracted in the case
12
of the wireless device as shown in
FIG. 8
, the stopper
3
coupled with the first antenna element
1
is separated from the antenna holder
9
and the feeding fixture
7
is brought into contact with the springs
10
contained in the antenna holder
9
, thereby enabling the second antenna element
5
connected electrically with the feeding nut
11
via the feeding fixture
7
to transmit/receive radio waves via the antenna.
However, since with the foregoing prior art antenna the coupling between the joint
4
fixed to the first antenna element
1
and the feeding fixture
7
connected with the second antenna element
5
is performed by screwing the screw threads
4
A of the joint
4
into the screw threads
7
A of the feeding fixture
7
with an adhesive applied thereto the cost of the molding process involved with the screw threads
4
A of the joint
4
tends to become high and also the processing cost involved with cutting the screw threads
7
A of the feeding fixture
7
and the like becomes expensive. Furthermore, controlling the position where an adhesive is applied and the amount of the adhesive applied between the screw threads
4
A and the screw threads
7
A is rather difficult.
In addition, the assembly work of the antenna is time consuming.
The present invention provides an antenna that facilitates the preparations of piece parts required in coupling the joint and the feeding fixture together and also the assembly work involved, resulting in less expense in time and effort and leading to realization of a less expensive antenna.
SUMMARY OF THE INVENTION
A manufacturing method for an antenna of the present invention includes the steps of:
providing a feeding fixture electrically connected to a second antenna element so as to sheathe a joint fixed to the end part of a first antenna element; and
coupling the joint and the feeding fixture by applying an inward pressing process partially to the periphery of the feeding fixture.
An antenna of the present invention includes:
a first antenna element;
an electrically insulating joint fixed to one end of the first antenna element;
a feeding fixture formed of a metal put in place sheathing the joint; and
a second antenna element electrically connected to one end of the feeding fixture, in which the feeding fixture has a pressing process applied portion, to the periphery of which an inward pressing is applied, and the feeding fixture and the joint are coupled with each other at the pressing process applied portion.
According to the above structure, preparations of the piece parts required in coupling the joint and the feeding fixture together and the assembly work involved with an antenna can be made easier and a less expensive antenna can be obtained.


REFERENCES:
patent: 4647936 (1987-03-01), Taikawa
patent: 5177493 (1993-01-01), Tomura et al.
patent: 5703602 (1997-12-01), Casebolt
patent: 5757337 (1998-05-01), Hsueh et al.
patent: 5781867 (1998-07-01), Tidwell
patent: 5793331 (1998-08-01), Anzai et al.
patent: 5900846 (1999-05-01), Phelps et al.
patent: 5995064 (1999-11-01), Yanagisawa et al.
patent: 6031493 (2000-02-01), Tsuda et al.

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