JPH11251811A - Antenna device for mobile communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antenna device for mobile communication equipment provided with the constitution capable of surely preventing the occurrence of noise during speaking by surely preventing an antenna element from oscillating between with a member for coating its outer periphery without increasing the assembly of man-hour. SOLUTION: This antenna device for a mobile communication equipment is provided with a linear antenna element which is slidable within a drawing position and to housing position to/from the housing of the mobile communication equipment and an antenna tube 10 for coating the outer periphery of this element 6a. In this case, the tube 10 is provided with an oscillation control part 10A of the element 6a on its inner surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device for a mobile communication device such as a portable telephone or a portable radio, and more particularly, to a support structure for an antenna element.

[0002]

2. Description of the Related Art As is well known, a mobile communication device such as a mobile phone or a portable wireless device is equipped with a transmitting / receiving antenna. The transmission / reception antenna can be stored and pulled out of the communication device main body, and is used by being pulled out from the mobile communication device main body during a call. FIG. 4 shows an example of such an antenna. In FIG. 4, the antenna includes a coil antenna unit 2 and a rod antenna unit 6 that constitute an antenna element. The coil antenna unit 2 is located at the distal end of the antenna, and is configured by wearing a coil element 2 a on a bobbin 3 provided in the cap 1, and the coil element 2 a is attached to the base end of the top 1. It is connected to a conductive sleeve 4 to be joined.

On the other hand, the rod antenna section 6 is configured by covering an antenna conductor 6a, which is one of the components of the antenna element, with a flexible antenna tube 7 having elasticity. The antenna conductor 6 is connected to a conductive stopper 8 provided at the end.
The base end of a is connected. The distal end portion of the rod antenna section 6 is fixed to the conductive sleeve 4 serving as the base end section of the coil antenna section 2 via a joint section 5 while being electrically insulated. The joint portion 5 is made of an insulating resin material, and the distal end portion of the rod antenna portion 6 is integrally connected to the base end side, and the distal end side is integrally connected to the inside of the conductive sleeve 4. Reference numeral 9 indicates a holder for mounting the antenna on the housing. In the antenna shown in FIG. 4, the distal end portion of the rod antenna section 6 is electrically insulated from the coil antenna section 2 via the joint section 5, but instead of such a configuration, the rod antenna section 6 and the coil There is also a configuration in which the antenna unit 2 is formed in an electrically conductive state.

[0004] The antenna shown in FIG. 4 is assembled by inserting the antenna conductor 6 a into the antenna tube 7 because the antenna conductor 6 a is covered with the antenna tube 7 when assembling.

[0005]

By the way, the antenna tube 7 has an inner diameter slightly larger than the outer diameter of the antenna conductor 6a in order to easily insert the antenna conductor 6a. Due to such a difference in size, a gap of, for example, about 0.03 to 0.13 mm is formed between the outer peripheral surface of the antenna conductor 6a and the inner peripheral surface of the antenna tube 7, and this gap is used as a fitting allowance. be able to. However, if there is such a gap, the behavior of the antenna conductor 6a becomes unstable in the gap, and vibration is generated, which causes noise and noise during a call. That is, the antenna conductor 6
Since a can move in the gap, it may sway in the gap due to vibration during walking or riding, or under strong wind, and may make a collision sound when colliding with the antenna tube 7. For this reason, the collision sound becomes noise during transmission / reception, and there is a possibility that the voice during the call becomes difficult to hear.
Therefore, in the related art, the antenna conductor 6a and the antenna tube 7 are bonded to each other so that the antenna conductor 6a is
It was being integrated into. However, in the case of bonding, not only the bonding step is required, but also the work of removing the adhesive protruding from the antenna tube 7 after inserting the antenna conductor 6a is required, and the number of antenna assembly steps increases. Problem.

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the conventional antenna apparatus for mobile communication equipment, the object of the present invention is to prevent the antenna element from vibrating with the member whose outer periphery is covered without increasing the number of assembly steps. An object of the present invention is to provide an antenna device for a mobile communication device having a configuration capable of reliably preventing the occurrence of noise during conversation.

[0007]

In order to achieve this object, the invention according to claim 1 comprises a linear antenna element slidable between a drawer position and a storage position with respect to a housing of a mobile communication device. An antenna device for a mobile communication device, comprising: an antenna tube that covers an outer periphery of the antenna element, wherein the antenna tube is provided with a vibration preventing portion of the antenna element on an inner surface thereof. .

According to a second aspect of the present invention, in the antenna device for a mobile communication device according to the first aspect, the vibration preventing portion is formed by a protrusion formed on an inner surface of the antenna tube, and the protrusion is formed by the antenna element. It is characterized by contacting the outer surface.

The invention described in claim 3 is the first or second invention.
In the antenna device for a mobile communication device according to the aspect, the vibration preventing unit includes a protrusion that can contact a plurality of locations in an outer circumferential direction of the antenna element in a range where the antenna element is inserted in a longitudinal direction of the antenna tube. It is characterized by being.

According to a fourth aspect of the present invention, in the antenna device for a mobile communication device according to the third aspect, the vibration preventing portions are formed at equal positions in an outer peripheral direction of the antenna element. I have.

[0011]

According to the first and second aspects of the present invention, since the antenna tube into which the antenna element is inserted is provided with the vibration preventing portion for preventing the vibration of the antenna element, the antenna element is inadvertently shaken to generate noise. Is prevented. In particular, according to the second aspect of the present invention, since the vibration preventing portion is formed by the protrusion contacting the outer surface of the antenna element, the swing of the antenna element can be suppressed, and thereby the antenna element collides with the inner surface of the antenna tube. Nothing.

According to the third and fourth aspects of the present invention, the vibration preventing portion does not come into contact with the entire outer peripheral surface of the antenna element in the entire insertion range of the antenna element in the antenna tube, but can make the necessary minimum contact. Therefore, it is possible to suppress an increase in sliding resistance during the work of inserting and inserting the antenna element, to facilitate the assembling work, and to suppress the swing of the antenna element when the assembling is completed.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a configuration diagram corresponding to FIG. 4 showing an antenna device for a mobile communication device according to an embodiment of the present invention. In FIG. 1, the same components as those shown in FIG. 4 are denoted by the same reference numerals. 1, the antenna device for a mobile communication device includes a coil antenna unit 2 and a rod antenna unit 6 as in the configuration shown in FIG. The coil antenna part 2 is located at the tip of the antenna, and is configured by wearing a coil element 2a on a bobbin 3 provided in the top 1.
a is a conductive sleeve 4 coupled to the proximal end of the top 1
It is connected to the.

On the other hand, the rod antenna section 6 is formed by coating the antenna conductor 6a with the antenna tube 10, which is a feature of the present embodiment, and has a conductive property provided at the base end of the antenna. The base end of the antenna conductor 6 a is connected to the stopper 8. The distal end portion of the rod antenna section 6 is fixed to the conductive sleeve 4 serving as the base end section of the coil antenna section 2 via a joint section 5 while being electrically insulated. The joint portion 5 is made of an insulating resin material, and the distal end portion of the rod antenna portion 6 is integrally connected to the base end side, and the distal end side is integrally connected to the inside of the conductive sleeve 4. Reference numeral 9 indicates a holder for mounting the antenna on the housing.

The antenna tube 10 is formed of a flexible resin tube having elasticity, and the antenna conductor 6
a is formed so as to have an inner diameter in which a can be inserted. On the inner surface of the antenna tube 10, as shown in FIG. 2, a vibration preventing unit 10A is provided. The vibration preventing portion 10A is composed of a plurality of protrusions 10A1 formed at three equally spaced positions along the circumferential direction in the longitudinal direction of the antenna tube 10, and the protrusion 10A1 is the antenna tube 10 in the present embodiment. When the inner peripheral surface side is used as a base, the distal end side is formed in a triangular shape having an acute angle shape. The height of the projection 10A1 is a height that can abut the outer peripheral surface of the antenna conductor 6a, that is, the inner diameter of the antenna tube 10 and the antenna conductor 6a.
And a height corresponding to a gap corresponding to a difference from the outer diameter. The protrusion 10A1 is formed when the antenna tube 10 is formed.
The antenna tube 10 is integrally formed with a pair of the antenna tubes 10 to form a part of the antenna tube 10.

Since the present embodiment has the above configuration,
By inserting the antenna conductor 6a into the antenna tube 10, the outer peripheral surface of the antenna conductor 6a is covered. When the antenna conductor 6a is inserted into the antenna tube 10, only the protrusions 10A1 forming the vibration preventing portions 10A on the antenna tube 10 are formed at a plurality of locations along the circumferential direction of the antenna conductor 6a. The antenna conductor 6a can be inserted without significantly increasing the contact resistance. After the insertion, the antenna conductor 6a is maintained at a predetermined gap from the inner surface of the antenna tube 10 without requiring any work such as bonding. can do.

The antenna conductor 6a is, as shown in FIG.
The outer peripheral surface abuts against the vibration preventing portion 10A of the antenna tube 10, and the movement including the radial direction is regulated. For this reason, even if the antenna conductor 6a shakes due to disturbance,
Since the vibration is suppressed by the vibration preventing unit 10A,
The antenna conductor 6a is maintained in a state where it cannot collide with the inner surface of the antenna tube 10. According to the above-described embodiment, since the protrusion 10A1 forming the vibration preventing portion 10A is formed in the longitudinal direction of the antenna tube 10 over the entire insertion range of the antenna conductor 6a in the antenna tube 10, the Since the insertion-side tip can move while slidingly contacting the surface of the projection 10A1, rattling is prevented compared to a case where the projection 10A1 is not provided, and the insertion can be performed smoothly. In the above embodiment, the configuration in which the distal end portion of the rod antenna unit 6 is electrically insulated from the coil antenna unit 2 via the joint unit 5 has been described, but the present invention is not limited to such a configuration. Alternatively, a configuration in which the rod antenna unit 6 and the coil antenna unit 2 are electrically connected to each other may be used.

[0018]

As is clear from the above embodiments, according to the first and second aspects of the present invention, the antenna tube into which the antenna element is inserted is provided with the vibration preventing portion for preventing the vibration of the antenna element. This prevents the antenna element from inadvertently swinging and generating noise. In particular, according to the second aspect of the present invention, since the vibration preventing portion is formed by the protrusion contacting the outer surface of the antenna element, the swing of the antenna element can be suppressed, whereby the antenna element is formed on the inner surface of the antenna tube. Without collision, it is possible to reliably prevent the generation of noise due to the collision of the antenna element, and hence the generation of noise during a call. Moreover,
Since the antenna element is integrated with the antenna tube when the antenna element is in contact with the projections that prevent vibration, there is no need for the bonding work required to integrate these two. And the number of assembly steps can be reduced.

According to the third and fourth aspects of the present invention, the vibration preventing portion does not abut on the entire outer peripheral surface of the antenna element in the entire area where the antenna element is inserted in the antenna tube, but requires a minimum required area. Since the contact can be made, it is possible to suppress an increase in sliding resistance at the time of inserting and inserting the antenna element, to simplify the assembling work, and to suppress the swing of the antenna element at the time of completion of the assembling. it can. As a result, the antenna element is firmly supported in the antenna tube via the anti-vibration part, so that the bonding work, which is the integration work conventionally required, is unnecessary, and the number of assembling steps can be reduced. it can.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an overall configuration of an antenna device for a mobile communication device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of an antenna tube used in the antenna device for a mobile communication device illustrated in FIG.

FIG. 3 is a sectional view taken in the direction indicated by reference numeral (3) in FIG.

FIG. 4 is a diagram illustrating a conventional structure of an antenna device for a mobile communication device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Top part 2 Coil antenna part which forms a part of antenna element 3 Bobbin 4 Conductive sleeve 5 Joint part 6 Rod antenna part which forms another part of an antenna element 6a Antenna conductor which is one of the components of an antenna element 8 Stopper Reference numeral 9 Holder 10 Antenna tube 10A Anti-vibration part 10A1 Projection

Claims (4)

[Claims] 1. A mobile communication device comprising: a linear antenna element slidable to a drawer position and a storage position with respect to a housing of the mobile communication device; and an antenna tube covering an outer periphery of the antenna element. An antenna device for a mobile communication device, wherein the antenna tube is provided with a vibration preventing portion of the antenna element on an inner surface thereof. 2. The antenna device for a mobile communication device according to claim 1, wherein the vibration preventing portion is formed by a protrusion formed on an inner surface of the antenna tube, and the protrusion contacts an outer surface of the antenna element. An antenna device for mobile communication equipment. 3. The antenna device for a mobile communication device according to claim 1, wherein the vibration preventing portion extends in the outer circumferential direction of the antenna element in a range where the antenna element is inserted in a longitudinal direction of the antenna tube. An antenna device for a mobile communication device, comprising: a projection capable of contacting a plurality of locations. 4. The antenna for a mobile communication device according to claim 3, wherein the vibration preventing portions are formed at equally-spaced positions in an outer circumferential direction of the antenna element. apparatus.