JPH1155019A - Antenna for portable equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the drop strength of an element. SOLUTION: A flange-shaped part 5-2 is formed at the top end part of an element 5 molded integrally with a joint part. The flange-shaped part 5-2 can be composed of a conical part 5-4. Further, the flange-shaped part 5-2 can be composed of a 1st straight part 5-3, conical part 5-4 and 2nd straight part 5-5 or can be composed of a 1st conical part 5-6 and a 2nd conical part 5-7. Further, the flange-shaped part 5-2 can be composed of plural expanded diameter parts as well. Thus, the flange-shaped part 5-2 is formed like this so as to improve the drop strength of the element 5 when the element 5 is molded integrally with the joint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna for portable equipment provided in a portable telephone, a portable radio, and the like.

[0002]

2. Description of the Related Art In a conventional portable device antenna of this type, an antenna top is provided at the tip of the whip antenna, and the whip antenna slides on a mounting portion fixed to a housing of the portable device. It is free to move. Further, in a conventional portable device antenna, a helical antenna is provided at a distal end portion, and the whip antenna is insulated from the helical antenna and is integrally fixed to the helical antenna. When the whip antenna is retracted, only the helical antenna is connected to the radio circuit of the portable device, and when the whip antenna is extended, only the whip antenna is connected to the radio circuit of the portable device. I have.

FIG. 6 is an overall view showing a conventional structure of such a portable device antenna, and FIG. 7 and FIG. The mobile device antenna illustrated in FIG. 6 is configured such that a helical antenna built in an antenna top 102 and a whip antenna 101 including a linear element 105 are arranged on one axis. The helical antenna forms a helical element by being wound around a coil bobbin. The antenna top 102 is formed by molding the coil bobbin with a synthetic resin.

A lower end of the coil bobbin around which the helical element is wound is fitted into an upper end of a metal top plug 103. Thereby, the helical element and the top plug 103 are electrically connected. Also,
The top plug 103 is integrally formed so as to be fitted to an insulating joint 104, and the outer surface of up to about half of the elongated synthetic resin joint 104 has a top plug 10.
3 is covered. Then, inside the lower half of the joint 104, a metal element 10 having elasticity is provided.
The joint 104 and the element 105 are fixed to each other by integrally molding the distal end of the element 5. As a result, the top plug 103 electrically connected to the helical antenna and the element 105 are connected to the joint 1
04 is insulated and fixed.

The element 105 is covered with a synthetic resin tube, and a metal stopper 111 is fixed to the lower end of the element 105. A ring (not shown) is fitted around the outer periphery of the element 105,
When the element 105 is pressed into the stopper 111, the element 105 is firmly fixed to the element 105,
The element 105 and the stopper 111 are electrically connected. Further, the element 105 is slidably fitted in a metal holder 110, and a collet spring (not shown) for holding the element 105 is provided in an insertion hole of the holder 110.

In the antenna configured as described above,
When the whip antenna 101 is stored, the holder 110
Then, the top plug 103 is inserted into the insertion hole, and the holder 110 and the helical antenna are electrically connected through the top plug 103. When the whip antenna 101 is extended, the holder 1
A stopper 111 is inserted from below into the insertion hole of the holder 10, and the holder 110 and the element 105 are electrically connected via the stopper 111. Therefore, when the whip antenna 101 is stored, only the helical antenna can be in the operating state, and when the whip antenna 101 is extended, only the element 105 can be in the operating state.

Next, the element 105 and the joint 10
7 (a) shows the state of connection with the element 105.
FIG. 7 (b) shows the configuration of the tip portion of FIG. FIGS. 7A and 7B
As shown in (1), a flat punched portion 133 is formed at the tip of the element 105 so as to prevent the element 105 from coming out of the joint 104. The element 105 is made of an elastic metal wire having a diameter of about 0.8 mm, and has a flat hitting portion 133 formed by flat hitting at the tip thereof. The element 105 is made of, for example, a Ni-Ti alloy. In the case of flat striking, first, in order to prevent cracks at the time of flat striking, a portion to be flat struck is annealed, and then flat striking is performed. I have to.

[0008]

However, in the conventional antenna for portable equipment, when the element 105 is flat-cut, it is necessary to perform an annealing process, which increases the number of steps. Cannot be performed in a targeted manner, and the range is widened, so that an unnecessary part is affected. For this reason, there has been a problem that the element 5 is apt to be broken or bent. Further, even if annealing is performed, the working ratio of flat striking is limited, the size of the flat struck portion 133 cannot be increased, and the strength of forming connection with the joint 104 cannot be increased.

Further, in the conventional antenna for portable equipment, since the tip of the flat hitting portion 133 is square,
There has been a problem that when bent, the joint 104 is scratched and easily broken. Furthermore, when the element 105 is insert-molded into the joint 104, the diameter of the joint 104 is as small as about 2.5 mm.
There is a problem that molding defects such as a weld flow and silver are likely to occur, and the molding strength is reduced. FIG. 8 shows a state after the molding at this time.
Since the flow of the resin at the time of resin molding is not smooth in the vicinity of, a cavity 140 is generated behind the flat hitting portion 133 as shown in the figure, and there is a problem that the portion is easily broken. Was.

[0010] Furthermore, as in the flat hitting portion 133,
Since the portion enlarged in diameter from the original diameter of the element 105 is formed in a portion that is integrally formed with the joint 104, the thickness of the joint is thin at that portion, and the joint 104 is integrally formed with the element 105. , The diameter of the joint 104 is larger than the diameter of the element 105. Then, when the element 105 or the joint 104 is bent, stress concentrates on a portion of the joint 104 where a large diameter portion at the tip of the element 105 is located. For this reason, the joint 104 is broken because the resin material at the portion of the joint 104 where stress is concentrated is broken and the joint 104 is broken, or the resin material at the portion is elongated and the joint 104 is broken. There is a problem that the problem is easily generated. Therefore, the present invention provides an antenna for portable equipment which does not require annealing, does not cause molding failure, and can increase the strength of the element to be removed, thereby making it possible to reduce the diameter of the joint. It is intended to provide.

[0011]

In order to achieve the above object, an antenna for a portable device according to the present invention comprises an insulative elongated rod-shaped joint portion and a conductive member for covering the surface from the tip to the middle of the joint portion. A conductive antenna element having a front end integrally formed at the rear end of the joint portion, and a helical provided at the front end of the top plug and electrically connected to the top plug. An antenna, a conductive stopper fixed to the rear end of the antenna element, electrically connected to the antenna element, and slidably holding the antenna element; and A conductive holder that is electrically connected and electrically connected to the stopper during extension, and is integrally formed with the joint portion. It said distal portion of said antenna element being, at least, includes a conical cone at the top, the lower surface is to form a brim portion which is a planar.

In the above-mentioned antenna for portable equipment,
A straight portion having substantially the same diameter as the antenna element may be formed at an upper end of the conical portion. Further, in the flange-shaped portion of the portable device antenna, a straight portion having the same diameter as the maximum diameter may be formed so as to be connected to a portion having a maximum diameter of the conical portion. Furthermore, a flat part for stopping rotation of the antenna element with respect to the joint part may be formed on a side surface of the flange-shaped part in the portable device antenna. Furthermore, in the antenna for a portable device, at least at the tip of the antenna element, a plurality of flange-shaped portions having a conical conical portion at an upper portion and a flat lower surface may be formed. Good. Furthermore, a second conical portion having an inclination different from that of the conical portion may be formed at an upper end of the conical portion in the portable device antenna.

According to the antenna for a portable device of the present invention, the upper end of the element has at least an upper conical portion having a conical shape, and the flange having a flat lower surface is subjected to annealing. Since it is formed without necessity, it is possible to prevent adverse effects on the element due to annealing. In addition, the flow during molding is improved by the collar,
It is possible to prevent the occurrence of molding defects such as weld flow and silver. In addition, since the lower surface of the flat portion of the flange portion comes into engagement with the resin of the molding material forming the joint portion integrally formed with the element,
The detachment strength of the element from the joint can be improved. Therefore, it is possible to use not only a hard resin material but also a relatively soft material such as nylon as a molding material.

As described above, since the detachment strength of the element with respect to the joint portion can be improved, the required detachment strength can be obtained even if the diameter of the joint portion is reduced. And if the diameter of the joint part is reduced so as to approach the diameter of the element, stress does not concentrate on the joint part when the element is bent,
The stress becomes distributed. For this reason, breakage or elongation does not occur in the joint portion, and breakage of the joint portion can be prevented. Further, when a flat portion for preventing rotation is formed on the side surface of the flange portion,
The rotation of the element with respect to the joint part can be prevented.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the appearance of a portable telephone provided with a portable device antenna according to the present invention. In this figure, reference numeral 1 denotes a whip antenna, and an antenna top 2 is provided at the tip. The whip antenna 1 is slidably held by a metal holder 10. When the whip antenna 1 is housed in the mobile phone 30, only the helical antenna built in the antenna top 2 operates. The helical antenna is connected to a transmitting / receiving circuit built in the mobile phone 30 via the holder 10. When the whip antenna 1 is extended from the mobile phone 30, only the whip antenna 1 operates. In this case, the whip antenna 1 is connected to a transmitting / receiving circuit built in the mobile phone 30 via the holder 10. The electrical length of the helical antenna and that of the whip antenna 1 are set so as to operate in the same frequency band.

The mobile device antenna of the present invention is configured such that a whip antenna 1 and an antenna top 2 having a built-in helical antenna are arranged on one axis. FIG. 2 shows an example of the configuration of the embodiment of the portable device antenna of the present invention. However, in FIG. 2, a part of the whip antenna 1 is shown broken. In FIG. 2, a helical antenna (not shown) is built in an antenna top 2 fixed to the upper end of the whip antenna 1. This helical antenna is configured by winding a wire around a spiral groove of a coil bobbin, or applying metal plating or the like to the spiral groove of the coil bobbin. The antenna top 2 is formed by molding the coil bobbin so as to cover it with a synthetic resin.

The lower end of the coil bobbin in the antenna top 2 is fitted into the upper end of a metal top plug 3. As a result, the helical element and the top plug 3 are electrically connected. The top plug 3 has a cylindrical shape, and an insulating joint 4 is integrally formed in an inner space of the top plug 3. The joint 4 is formed so as to protrude from the lower end and the upper end of the top plug 3, so that about half of the outer surface of the elongated synthetic resin joint 4 is covered by the top plug 3. The distal end of a metal element 5 having elasticity is integrally formed in the lower half of the joint 4, and the flange 4 is formed at the distal end of the element 5 to form a joint with the joint 4. Element 5
Are firmly fixed. Also, the top plug 3 to which the helical antenna is electrically connected and the element 5 are insulated by the insulating joint 4.

The element 5 is covered with a flexible synthetic resin tube 6, and a metal stopper 11 is fixed to the lower end of the element 5. A ring (not shown) is fitted around the outer periphery of the element 5 fitted in the stopper 11, and the element 5 is pressed into the stopper 11, whereby the element 5 and the stopper 11 are firmly fixed. At the time of fixing, the element 5 and the stopper 11 are electrically connected. Further, the element 5 is slidably fitted into a metal holder 10, and a collet spring (not shown) for holding the element 5 is provided in an insertion hole of the holder 10.

Whip antenna 1 configured as described above
When the whip antenna 1 is slid and housed in the holder 10, the top plug 3 is inserted into the insertion hole of the holder 10 so that the holder 10 and the helical antenna are electrically connected. become. At this time, the element 5 is not connected to the holder 10 by the action of the insulating joint 4. When the whip antenna 1 is extended, the stopper 11 is inserted into the insertion hole of the holder 10 from below, so that the holder 10 and the element 5 are electrically connected. At this time, the helical antenna is not connected to the holder 10 by the action of the joint 4. Therefore, when the whip antenna 1 is stored, only the helical antenna can be in the operating state, and when the whip antenna 1 is extended, only the whip antenna 1 can be in the operating state.

The tip of the element 5 has a flange 5
-2 is formed, and the flange 5 is formed integrally with the joint 4 to prevent the element 5 from coming off the joint 4. Next, FIG. 3 shows an example of the configuration of the flange portion 5-2 showing characteristics of the antenna for a portable device of the present invention. However, FIGS. 3A to 3E show a plan view and a left side view, respectively. The first example of the flange portion 5-2 shown in FIG. 3A is formed by forming a conical portion 5-4 at the tip of the element 5. The tip of the conical portion 5-4 is partially cut, and the lower surface of the conical portion 5-4 is flat. For this reason, the lower portion of the flange portion 5-2 projects from the element 5, and the lower surface thereof is flat. Therefore, the tip of the element 5 is
When molded integrally, the flow of the grease material becomes good and the joint 4 can be molded without causing molding failure, and the flat lower surface engages with the joint 4, It is possible to prevent the element 5 from coming off.

For this reason, even if the joint 4 is made thin, a sufficient pull-out strength can be obtained. In addition, by extending a portion having a small diameter ahead of the enlarged diameter portion at the tip portion of the element, it is possible to disperse the stress generated at the enlarged diameter portion when the element 5 is bent, and to concentrate the element tip where the stress is easily concentrated. The thickness of the joint 4 in the portion can be increased. Therefore, the joint 4 can be prevented from being broken and the diameter can be reduced. Therefore, the joint 4 can be prevented from being broken and the diameter can be reduced. In the second example of the flange portion 5-2 shown in FIG. 3B, a first straight portion 5-3 having the same diameter as the element 5 is formed at the distal end portion. -3
A conical portion 5-4 is formed so as to be connected to. Further, a second straight portion 5-5 having the same diameter as the diameter of the lower surface of the conical portion 5-4 thicker than the element 5 is formed so as to be connected to the lower end of the conical portion 5-4. This second straight part 5
The lower surface of -5 is flat. The flange portion 5-2 in the second example has the same effect as the first example, but the thickness of the joint portion 4 around the first straight portion 5-3 can be increased. The strength of this portion can be improved, and the dispersion of stress at the time of bending can be measured.

Further, a third example of the flange portion 5-2 shown in FIG. 3C is the second straight portion 5 in the second example.
-5 is removed, and the inclination of the conical portion 5-4 is changed to the element 5
Is made to be gentle with respect to the central axis.
The flange portion 5-2 in the third example has the same effect as the second example, but the conical portion 5-4 has a gentle inclination so that the flow of the resin can be improved more favorably. can do. Further, in a fourth example of the flange portion 5-2 shown in FIG. 3D, a first conical portion 5-6 is formed at the tip, and is connected to the first conical portion 5-6. A second conical portion 5-7 is formed as shown in FIG. The inclination of the second conical portion 5-7 is steeper than the inclination of the first conical portion 5-6. The collar 5-2 in the fourth example is the third
The same operation as that of the example is obtained, but the thickness of the joint portion 4 around the second conical portion 5-6 can be increased, so that the strength of this portion can be further improved and the resin The flow can be better.

Further, a flange portion 5 shown in FIG.
In the fifth example, the enlarged diameter portion is formed in two steps. The configuration of each of the two-stage enlarged-diameter portions is shown in FIG.
(A) to the flange portion 5-2 having the configuration shown in FIG.
In the example shown in FIG.
The enlarged diameter portion having the configuration of the flange portion 5-2 shown in FIG.
The flange 5-2 is formed by forming the configuration of the flange 5-2 shown in FIG. 3C at the second stage. That is, the first conical portion 5-6 is formed at the tip, and the second conical portion 5-7 is formed so as to be connected to the first conical portion 5-6. Further, a third conical portion 5-8 is formed at a predetermined distance from the second conical portion 5-7. The flange 5-2 in the fifth example is
The same effect as that of the fourth example is obtained, but since the enlarged diameter portion is formed in two steps, the pull-out strength can be further improved.

In the flange 5-2 shown in FIGS. 3 (a) to 3 (e), a part of the side surface of the flange 5-2 is cut away to form a flat portion parallel to the extending direction of the element 5. When formed, the joint 4 and the element 5 that is insert-molded can be prevented from rotating. FIG. 4 shows an example of a configuration for forming such a flat portion, and FIG.
The example which formed the flat part 5-9 in the flange-shaped part 5-2 of the 5th example shown to (e) is shown. In the flange portion 5-2 formed by forming the two-stage enlarged portion in FIG. 4, the side surface of the second conical portion 5-7 and the side surface of the third conical portion 5-8 are notched. The flat portions 5-9 are respectively formed. Since the flat portion 5-9 has a shape shown in the left side view, when the joint 4 and the tip of the element 5 are insert-molded, the element 5 with respect to the joint 4 is removed.
Rotation is regulated.

Any of the flanges 5-2 described above can be formed without subjecting the element 5 to annealing. One of the flanges 5-2 is formed at the tip of the element 5. In this state, the tip of the element 5 and the joint 4 are insert-molded. In this case,
The metal top plug 3 is also integrally formed. FIGS. 5A to 5D show an example in which the top plug 3, the joint 4 and the element 5 are integrally formed. FIGS. 5A to 5D correspond to the elements 5 in each of which the flange portions 5-2 of the first to fourth examples shown in FIGS. 3A to 3D are formed. ing.

The configurations shown in FIGS. 5A to 5D are the same except for the configuration of the flange 5-2.
This will be described with reference to (d) as an example. In FIG. 5D, a flange portion 5-2 formed at the tip of the element 5 is formed integrally with a lower portion of the joint 4. And
The joint 4 is moved to a position slightly above the flange 5-2.
Are covered by the top plug 3. The tip of this joint 4 reaches inside the tip of the top plug 3,
The joint 4 and the top plug 3 are integrated with each other because the distal end of the joint 4 is formed with an enlarged diameter in the distal end portion. The upper end of the top plug 3 is configured to be fitted with a bobbin constituting a helical antenna.

[0027]

As described above, the antenna for a portable device according to the present invention is provided with a conical portion having a conical shape at least at the upper portion at the upper end portion of the element and annealed flange portion having a flat lower surface. It can be formed without processing. For this reason, the element is not adversely affected by the annealing process, and the flow during molding is improved, and the
Generation of molding defects such as flow and silver can be prevented. Also, since the flat lower surface of the flange-shaped portion comes into engagement with the resin of the molding material forming the joint portion integrally formed with the element, the pull-out strength of the element with respect to the joint portion is improved. can do. Therefore, it is possible to use not only a hard resin material but also a relatively soft material such as nylon as a molding material.

Further, since the detachment strength of the element with respect to the joint can be improved, the required detachment strength can be obtained even if the diameter of the joint is reduced. Even when the diameter of the joint is reduced, the stress applied to the joint when the element is bent is dispersed, and the thickness of the joint at the tip of the element at which stress tends to concentrate due to the small diameter of the joint. Also get thicker. For this reason, breakage or elongation does not occur in the joint portion, and breakage of the joint portion can be prevented. Further, when a flat portion for preventing rotation is formed on the side surface of the flange portion, rotation of the element with respect to the joint portion can be prevented. Furthermore,
The whip antenna is frequently bent during use, but even if it is bent, the tip of the element is a rounded flange, so the inside of the joint is not damaged and it is hard to break can do.

[Brief description of the drawings]

FIG. 1 is a view showing the appearance of a mobile phone having a mobile device antenna of the present invention.

FIG. 2 is a diagram showing a configuration example of an embodiment of a mobile device antenna according to the present invention.

FIG. 3 is a diagram illustrating a configuration example of a flange portion in the mobile device antenna of the present invention.

FIG. 4 is a view showing another example of the configuration of the flange portion in the mobile device antenna of the present invention.

FIG. 5 is a view showing a state in which a top plug, a joint, and an element in the portable device antenna of the present invention are integrally formed.

FIG. 6 is a diagram showing an example of a conventional portable device antenna.

FIG. 7 is a diagram showing details of a joint and an element in a conventional mobile device antenna.

FIG. 8 is a diagram showing a state when a joint is formed in a conventional portable device antenna.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Whip antenna 2 Antenna top 3 Top plug 4 Joint 5 Element 5-2 Flanged part 6 Tube 10 Holder 11 Stopper 30 Cellular phone

Claims (6)

[Claims] 1. An insulative elongated rod-shaped joint portion, a conductive top plug covering a surface from the front end to the middle of the joint portion, and a front end portion integrally formed at a rear end portion of the joint portion. A conductive antenna element, a helical antenna provided at the tip of the top plug and electrically connected to the top plug, and fixed to a rear end of the antenna element;
A conductive stopper electrically connected to the antenna element, and slidably holding the antenna element,
A conductive holder electrically connected to the top plug during storage and electrically connected to the stopper during extension; at least a tip of the antenna element integrally formed with the joint; An antenna for a portable device, comprising a conical conical portion on an upper portion, and a flange-shaped portion having a flat lower surface. 2. The portable device antenna according to claim 1, wherein a straight portion having substantially the same diameter as the antenna element is formed at an upper end of the conical portion. 3. The portable device according to claim 1, wherein a straight portion having the same diameter as the maximum diameter of the conical portion is formed in the flange portion so as to be connected to the maximum diameter portion of the conical portion. Equipment antenna. 4. The portable device antenna according to claim 1, wherein a flat portion for stopping rotation of the antenna element with respect to the joint portion is formed on a side surface of the flange portion. 5. A plurality of flanges having a conical portion having a conical shape at least in an upper portion and having a flat lower surface are formed at the distal end portion of the antenna element. Item 2. An antenna for a portable device according to Item 1. 6. The antenna for a portable device according to claim 1, wherein a second conical portion having an inclination different from that of the conical portion is formed at an upper end of the conical portion.