JP2000357908A - Helical antenna for communication unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a helical antenna for communication unit, which avoids fluctuations of a helical antenna characteristic based on an assembly method and whose assembly is facilitated. SOLUTION: This antenna is provided with a helical antenna element 3, formed of a lead part 32 having a coil-like helical antenna part 31 where a conductor is wound and an end part 33 which is bent in the axial direction and whose tip is formed rounded or into a V-shape, a cover 6 having a hole 61 storing the coil-like helical antenna part 31 and an opening part 62 and a metallic sleeve 4 having a tip part having a recessed part or a hole 43, to which the end part 33 of the helical antenna element 3 is engaged and a flange part 44 engaged with the opening part 62 of the cover 6. The end part 33 of the helical antenna element 3 is brought into contact with the recessed part or the hole 43 of the metallic sleeve 4, and a power feeding point is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical antenna for a communication device such as a cellular phone, and more particularly to a helical antenna provided on an antenna top of a whip antenna.

[0002]

2. Description of the Related Art A conventional antenna of a portable telephone or the like is configured to be expandable and contractible so that it can be stored in a housing for convenience in carrying.

As shown in FIG. 4, a conventional antenna element for a portable telephone comprises a whip antenna 1 composed of a conductor 11 covered with an elastic insulating tube 12 such as a synthetic resin, and an insulating coupling member. 5, a metal sleeve 4 coupled to the tip of the whip antenna 1, an antenna top T containing the helical antenna 3 electrically connected to the metal sleeve 4, and a rear end of the conductor 11 A conductor 11 and a metal sleeve 4 covered with an insulating tube 12 slide inside an antenna holder 8 fixed to an upper portion of a housing 9. It is configured to be movable.

When the antenna element is pulled out of the housing 9, the stopper 2 is inserted and held from the inside of the antenna holder 8 fixed to the housing 9, and the whip antenna 1 is electrically connected to the antenna holder 8. When the antenna element is stored, the metal sleeve 4 is inserted and held from the outside of the antenna holder 8 fixed to the housing 9 so that the helical antenna 3 is moved to the antenna holder 8. Electrically connected to
Transmission and reception can be performed by the helical antenna 3 protruding from the housing 9.

As shown in a longitudinal sectional view of FIG. 3, an antenna top T in a conventional antenna for a portable telephone has a metal sleeve 4 and a coil-shaped helical coil around which a conductive wire is wound.
The helical antenna 3 includes an antenna portion 31, a linear lead portion 32 that couples the helical antenna portion 31 to the metal sleeve 4, and a cover 6 that covers the helical antenna 3.

When connecting the lead portion 32 of the helical antenna 3 to the metal sleeve 4, the lead portion 32 is inserted into the hole 42 of the sleeve 4 and soldered 46, as shown in FIG. 3 or, as shown in FIG. 3B, is inserted through a boss hole 45 provided in the sleeve 4 and fixed by caulking.

The metal sleeve 4 is electrically connected to the antenna holder 8 when housed in the housing 9 and has a thin hollow end through which the insulating coupling member 5 is inserted.
41 and a flange 44 for screwing the opening 62 of the cover 6
It is composed of

[0008]

In such a conventional helical antenna 3, assembling work such as soldering or caulking was required to connect the lead portion 32 to the metal sleeve 4.

In such a conventional antenna top, the spiral winding dimension changes depending on the manner of fixing the lead portion 32 of the helical antenna 3, and the pitch increases based on the compression by the cover 6. As a result, the antenna characteristics varied depending on the assembly method.

Therefore, the present invention has been conceived in order to avoid variations in helical antenna characteristics based on how to assemble and to facilitate assembling.

[0011]

A helical antenna for a portable communication device according to the present invention has a coiled helical antenna portion 31 wound with a conductive wire and a terminal whose end is rounded or V-shaped by bending in the axial direction. The helical antenna element 3 including the lead portion 32 having the portion 33, the cover 6 having the hole 61 and the opening 62 for storing the coil-shaped helical antenna portion 31, and the terminal portion 33 of the helical antenna element 3 are fitted. A metal sleeve 4 serving as a power supply member having a tip portion having a recess or hole 43 to be fitted therein and a flange portion 44 engaging with an opening portion 62 of the cover 6 to feed a terminal portion 33 of the helical antenna element 3; The power supply point is formed by contacting the depression or hole 43 of the metal sleeve 4 serving as a member.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) In a first embodiment of an antenna top in a portable communication device antenna according to the present invention, as shown in a sectional view of FIG. It comprises a metal sleeve 4, a coiled helical antenna element 3 around which a conductive wire is wound, and a synthetic resin cover 6 covering the helical antenna element 3.

The helical antenna element 3 includes a coil-shaped helical antenna 31 having a conductive wire wound at a constant pitch,
A lead portion 32 having a distal end portion 33 which is bent in the axial direction and has a rounded or V-shaped tip.

The metal sleeve 4 is electrically connected to the antenna holder 8 when stored in the housing 9, and has a thin hollow end portion 41 through which the insulating coupling member 5 is inserted, and a hollow or hollow portion at the center. It is composed of a front end having a hole 43 and a flange 44 which is screw-engaged with the opening 62 of the cover 6.

The cover 6 made of synthetic resin has a hole 61 slightly larger than the outer diameter of the helical antenna 31 and an opening 62 which is screw-engaged with the flange 44 of the metal sleeve 4.

When assembling the antenna top, the formed end portion 33 of the lead portion 32 is opened.
After the helical antenna 3 is inserted into the hole 61 of the cover 6 made of synthetic resin so as to face the side, when the flange portion 44 of the metal sleeve 4 is screw-engaged with the opening 62 of the cover 6, the metal sleeve 4 The cover 3 and the coil-shaped helical antenna 3 are compressed, so that the rounded or V-shaped formed end portion 33 fits into the recess or hole 43 at the tip end of the metal sleeve 4 and 4 and the helical antenna 3 are connected.

The antenna top thus configured can be used by being coupled to the tip of the whip antenna 1 via an insulating coupling member 5, or only the antenna top can be used alone. .

(Second Embodiment) In a second embodiment of the antenna top in the antenna for portable communication equipment of the present invention, as shown in the sectional view of FIG. And a coil-shaped helical antenna element 3 wound with a conductive wire, and the helical antenna element 3
And a cover 6 made of synthetic resin.

The cover 6 made of a synthetic resin is composed of a body 63 and a cap 64.
Is integrally formed so as to surround the flange portion 44 of the metal sleeve 4 at the time of molding.

As in the first embodiment, the helical antenna element 3 has a coil-shaped helical antenna section 31 in which a conductive wire is wound at a constant pitch, and is bent in the axial direction to form a rounded or V-shaped tip. And a lead portion 32 having an end portion 33.

When assembling the antenna top, the helical member is formed into the body 63 of the cover 6 integrally formed with the metal sleeve 4 so that the formed end portion 33 faces the metal sleeve 4. -Cover antenna 3 6
After inserting the cap portion 64 into the body portion 63 by inserting, screwing, bonding or the like, the coil-shaped helical antenna 3 is compressed by the metal sleeve 4 and the cap portion 64. The rounded or V-shaped formed end portion 33 fits into the recess or hole 43 at the distal end of the metal sleeve 4 to complete the connection between the metal sleeve 4 and the helical antenna 3.

The end of the helical antenna element 3
The shape of 33 is not limited to a round shape or a V-shaped shape, but may be another shape.

[0023]

As is clear from the description based on the above embodiment, according to the antenna top having the helical antenna of the present invention, it is possible to avoid the variation of the antenna characteristics due to the assembling method, and the assembly is extremely difficult. Easy.

[Brief description of the drawings]

FIG. 1 shows an antenna of a mobile phone antenna according to the present invention.
Longitudinal sectional view showing the first embodiment of the top,

FIG. 2 shows an antenna of a mobile phone antenna according to the present invention;
Longitudinal sectional view showing a second embodiment of the top,

FIG. 3 is a longitudinal sectional view showing an example of a conventional antenna top;

FIG. 4 is a side view showing a part of an example of a conventional antenna for a mobile phone in a cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Whip antenna 2 Metal stopper 3 Helical antenna 4 Metal sleeve 5 Insulating coupling member 6 Synthetic resin cover 8 Antenna holder 9 Housing 31 Helical antenna part 32 Lead part 33 Formed end 41 Hollow end Part 41 43 Depression or hole 44 Flange 63 Body of cover 64 Cap of cover

Claims (2)

[Claims] 1. A helical antenna element comprising: a coil-shaped helical antenna portion wound with a conductive wire; and a lead portion having an end portion bent in the axial direction and having a rounded or V-shaped end. A cover having a hole and an opening for storing the helical antenna element; a power supply member having a tip having a recess or hole into which the end of the antenna element fits and a flange engaging with the opening of the cover; A helical antenna for a portable communication device, characterized in that a terminal portion of the helical antenna element is brought into contact with a recess or a hole at a tip portion of the power supply member to serve as a power supply point. 2. A helical antenna element comprising: a coil-shaped helical antenna portion wound with a conductive wire; and a lead portion having an end portion bent in the axial direction and having a rounded or V-shaped end. A cover having a body and a cap for storing the helical antenna element, and a power supply member having a tip having a recess or hole into which the end of the antenna element fits, and integrally formed with the body of the cover A helical antenna for a portable communication device, characterized in that an end of the helical antenna element is brought into contact with a dent or a hole at the tip of the feed member to serve as a feed point.