JPH0823215A - Twelescopic antenna - Google Patents

Abstract

PURPOSE:To provide a telescopic antenna which can prevent the vibrations that are caused when an antenna element is pulled out. CONSTITUTION:A chamfering part 11 is formed at the outer circumference of an antenna element 1, and another chamfering part 22 is formed at the inner circumference of a holder 2 and against the part 11. Then a slit 20 is formed on the lower end side face of the holder 2, and a calking part 21 is formed at the lower end of the slit 20. When the element 1 is pulled out of the holder 2, the part 11 of the element 1 is locked and held by the part 22 of the holder 2. At the same time, the part 21 holds the outer circumference of the element 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retractable antenna, and more particularly to an improvement of a structure for holding an antenna element when the retractable antenna used in a mobile phone or the like is extended.

[0002]

2. Description of the Related Art As a conventional retractable antenna, there is known an antenna comprising an antenna element and a holder for holding and accommodating the antenna element. A large-diameter stopper is integrally formed at the lower end of the antenna element. A slit is formed on the side surface of the holder, and a caulking portion is formed on the lower end of the slit. The holder has elasticity due to the slit and the crimped portion. In this conventional retractable antenna, when the antenna element is pulled out when using a mobile phone or the like, the stopper is pulled into the holder. Then, when the stopper is pulled in, the holder holds the antenna element by the elasticity described above. Positioning of the antenna element when it is extended is performed by the lower end of the caulking portion.

[0003]

However, in the above-mentioned conventional retractable antenna, since the antenna element is held only by the caulking portion of the holder, for example, when the user of the mobile phone moves while talking on the antenna element. Has the drawback that it easily vibrates. Therefore, there is a problem that the vibration is transmitted through the casing of the mobile phone, the user hears a vibration sound, and disturbs the call.

An object of the present invention is to provide a retractable antenna capable of preventing the above vibration from occurring when the antenna element is pulled out.

[0005]

A retractable antenna according to the present invention is a retractable antenna having an antenna element and a cylindrical holder for slidably holding the antenna element. In the pulled-out state, the antenna element is configured to be held by the holder at least at two positions in the axial direction.

[0006]

By holding the antenna element by the holder at two places, it is possible to prevent the antenna element from vibrating in the holder, and it is possible to eliminate the generation of vibration noise due to this vibration.

[0007]

1 shows a retractable antenna used in a mobile phone according to an embodiment of the present invention. The retractable antenna of this embodiment includes an antenna element 1 and a holder 2.

The antenna element 1 is rod-shaped and has a large-diameter stopper 10 integrally formed at the lower end thereof. A large-diameter antenna upper portion 13 is formed on the upper portion of the antenna element 1. The antenna element 1 has a small-diameter portion 14 on the upper side of the central portion, and also has a large-diameter portion 12 on the lower side of the central portion that is slightly thicker than the small-diameter portion 14. Furthermore, a chamfered portion 11 is formed on the stopper 10 side of the antenna element 1.

The holder 2 is cylindrical and holds the antenna element 1 axially slidably inside the holder 2.
A slit 20 is formed on the side surface of the lower end portion. The lower end of the slit 20 is swaged to form a swaged portion 21. The holder 20 has a structure having elasticity in the radial direction due to the slit 20 and the caulking portion (reduced diameter portion) 21 of the holder 2. Further, with reference to FIG. 2, a chamfered portion 22 corresponding to the chamfered portion 11 of the antenna element 1 is provided on the inner surface of the holder 2.

FIG. 2 shows a state in which the retractable antenna is extended when the mobile phone is used. In this state, the antenna element 1 is pulled out upward with respect to the holder 2. When the antenna element 1 is pulled out in this manner, the tip of the caulking portion 21 is elastically pressed against the outer circumference of the large diameter portion 12 of the antenna element 1 due to the elasticity of the holder 2, and as a result, the antenna is caulked in the caulking portion 21. The element 1 is elastically held.

Further, as described above, the antenna element 1
When the is pulled out, the chamfered portion 11 provided on the antenna element 1 is pressed against the chamfered portion 22 inside the holder 2 as shown in FIG. And antenna element 1
Positioning of the chamfered portion 11 and 22 is performed when the antenna is extended, and the chamfered portion 1 of the antenna element 1 is
1 is in a state in which the chamfered portion 22 of the holder 2 is locked and held.

Therefore, in the retractable antenna of the embodiment having the above structure, the antenna element 1 is pulled out from the holder 2 and the chamfered portion 11 of the antenna element 1 is held in the holder 2.
When the antenna element 1 is pressed against the chamfered portion 22, the antenna element 1 is held at the lower end of the caulked portion 21 of the holder 2 and at the chamfered portion 22. Then, as a result of the antenna element 1 being held by the holder 2 at two places in this way, the vibration of the antenna element 1 due to the vibration of the mobile phone is eliminated, and the user of the mobile phone does not hear the vibration sound.

In the above embodiment, the antenna element is held by the holder when it is pulled out (extended).
Although the configuration is such that it is held in three places, it may be held in three or more places. In this way, the structure of holding at three or more places is
In addition to the configuration of the above-described embodiment, for example, a convex portion is formed on the outer surface of the antenna element, and a concave portion corresponding to the convex portion is formed on the inner surface of the holder, and these convex portion and concave portion are engaged when the antenna element is pulled out. You can deal with them by combining them. Further, the antenna element may be provided with a concave portion and the holder may be provided with a convex portion.

FIG. 4 shows a conventional retractable antenna. The same parts as those of the retractable antenna of the above embodiment are designated by the same reference numerals. In this conventional retractable antenna, when the antenna element 1 is pulled out when the mobile phone is used as shown in FIG. 5, the stopper 10 is pulled into the holder 2. In this case, as shown in FIG. 6, the caulking portion 21 at the lower end of the slit portion 20 of the holder 2 comes into contact with the upper surface of the stopper 10, and thereby the antenna element 1 is locked. Therefore, when the stopper 10 is pulled into the holder 2, the antenna element 1 is elastically held at its lower end by elasticity of the slit 20 and the caulking portion 21 of the holder 2, and the caulking portion 21 and the stopper 10 are held. The positioning is performed by the above-mentioned contact with and.

[0015]

According to the retractable antenna of the present invention, since the antenna element is held in the holder at least at two positions in the axial direction, the antenna element is prevented from vibrating in the holder. Therefore, it is possible to eliminate the generation of vibration noise when the antenna element is pulled out.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a retractable antenna according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the retractable antenna of FIG. 1 when extended.

FIG. 3 is an enlarged cross-sectional view of a main part of the retractable antenna of FIG.

FIG. 4 is an explanatory diagram of a conventional retractable antenna.

5 is a partial cross-sectional view of the retractable antenna of FIG. 4 when extended.

FIG. 6 is an enlarged cross-sectional view of a main part of the retractable antenna of FIG.

[Explanation of symbols]

 1 Antenna Element 2 Holder 10 Stopper 11, 22 Chamfer 20 Slit

Claims (4)

[Claims] 1. A retractable antenna having an antenna element and a cylindrical holder that slidably holds the antenna element, wherein the antenna element is extended from the holder in the axial direction. A retractable antenna, characterized in that the holder is held in at least two places. 2. A retractable antenna having an antenna element and a cylindrical holder for slidably holding the antenna element, wherein a chamfered portion formed on the outer circumference of the antenna element and the holder are provided. The chamfered portion of the antenna element has a chamfered portion formed on the upper portion of the inner circumference and a reduced diameter portion formed on the lower end of the holder, and the chamfered portion of the antenna element is in a state of being drawn out from the holder. Locked and held by the chamfer,
The retractable antenna is characterized in that the reduced diameter portion holds the outer circumference of the antenna element. 3. The retractable antenna according to claim 2, wherein a slit is formed on a lower side of the holder, and the reduced diameter portion is formed on a lower end of the slit. 4. The retractable antenna according to claim 2, wherein the reduced diameter portion is a crimped portion.