JP2001168617A - Antenna device for portable radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an antenna device for portable radio equipment light in weight and inexpensive. SOLUTION: This antenna device 10 for portable radio equipment has a whip antenna 12 and a helical antenna 14 mechanically connected to its upper end part. An insulation core rod 32 having a shank part 34 and a head part 35 is connected to the upper end part of the antenna 12. An upper side terminal 42 consisting of a conductive sleeve having a stem part 44 and a connector part 46 and a bobbin 56 composed of an insulation sleeve are attached to the part 34. The antenna 14 is wound around the bobbin 56 and also electrically connected to the part 46 at its lower part. The bobbin 56 is composed of parts obtained by molding resin with the terminal 42 and the antenna 14 as insertion parts. An insulation cap 62 is screw-fitted to the terminal 42 so as to cover the antenna 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone,
More particularly, the present invention relates to an antenna device having a structure in which a helical antenna is connected to an upper end of a whip antenna.

[0002]

2. Description of the Related Art As an antenna device for a portable radio device,
2. Description of the Related Art There is known an antenna device of a type that can be pulled out and pushed into a wireless communication device for convenience in carrying.
This type of antenna device generally has a whip antenna and a helical antenna connected to its upper end. The whip antenna consists of a flexible rod-like conductor, and the helical antenna consists of a spirally wound conductor. The helical antenna may be electrically connected to the whip antenna or may be insulated. The whip antenna and the helical antenna are covered with a layer made of a synthetic resin (hereinafter simply referred to as a resin means a synthetic resin) for the purpose of improving aesthetics or protecting the appearance.

[0003] A lower terminal which is electrically connected to the whip antenna is attached to a lower end thereof, and an upper terminal which is electrically connected to the helical antenna is attached to an upper end thereof. The lower terminal is electrically connected to the holder-type terminal on the wireless device body when the antenna device is pulled out from the wireless device body. On the other hand, the upper terminal is electrically connected to the holder-type terminal on the wireless device main body when the antenna device is pushed into the wireless device main body. That is, when the wireless device is used, the antenna device is pulled out and transmitted and received by the whip antenna, and when the wireless device is not used, the antenna device is pushed in and received by the helical antenna.

[0004] This type of antenna device is manufactured by a method combining a step of molding a resin portion using a mold and a step of assembling parts formed into a predetermined shape.

[0005]

Many proposals have been made for the structure and manufacturing method of an antenna device. However, in recent years, with the spread of portable wireless devices, the size, weight, and price of portable wireless devices have been reduced, and further improvements have been demanded for antenna devices for portable wireless devices. It is rare. The present invention has been made based on such a viewpoint, and it is an object of the present invention to provide an antenna device for a portable wireless device capable of responding to these requests for a portable wireless device.

[0006]

SUMMARY OF THE INVENTION A first aspect of the present invention is as follows.
An antenna device for a portable wireless device, comprising: a whip antenna, a shank connected to an upper end of the whip antenna, and a head formed at an upper end of the shank and having a larger diameter than the shank. An insulating core rod, an upper terminal comprising a conductive sleeve mounted on the core rod, having a stem portion and a connector portion disposed above the stem portion, and the connector being connected to the upper terminal. A bobbin comprising an insulating sleeve disposed on the upper side of the portion and mounted on the core rod, wherein the bobbin is in contact with the head portion of the core rod, thereby forming the upper terminal and the bobbin relative to the core rod. Having a contact surface for positioning the bobbin, and being wound around the bobbin, Characterized by comprising a helical antenna which is electrically connected to the Kuta portion, and an insulating cap attached to the upper terminal so as to cover the helical antenna.

According to a second aspect of the present invention, in the antenna device for a portable wireless device according to the first aspect, the bobbin is formed by molding a synthetic resin using the upper terminal and the helical antenna as insert parts to thereby form the bobbin. It is characterized by comprising a part integrated with the terminal and the helical antenna.

According to a third aspect of the present invention, in the portable wireless device antenna device according to the second aspect, the helical antenna has a portion embedded in a peripheral surface of the bobbin.

According to a fourth aspect of the present invention, in the antenna device for a portable wireless device according to any one of the first to third aspects, the upper terminal and the two sleeves forming the bobbin are provided in their axial directions. Has substantially the same inside diameter as the shank portion over substantially the entire length of the shank portion.

According to a fifth aspect of the present invention, in the antenna device for a portable wireless device according to any one of the first to fourth aspects, the contact surface of the bobbin is disposed at a substantially upper end of the bobbin. Formed in the recessed portion.

According to a sixth aspect of the present invention, in the antenna device for a portable wireless device according to any one of the first to fifth aspects, the upper terminal and the cap have a male screw and a female screw, respectively, By screwing the screw and the female screw,
The cap is fixed to the upper terminal.

[0012]

FIG. 1 is a partial longitudinal sectional side view showing an antenna device 10 for a portable radio device according to an embodiment of the present invention. 2A to 2C are partial longitudinal sectional side views showing the final stage of the method of manufacturing the antenna device 10 shown in FIG. 1 in the order of steps.

The antenna device 10 includes a whip antenna 1 made of a conductive element having rigidity and flexibility.
2 and a helical antenna 14 composed of a conductive coil or the like mechanically connected to the upper end (right side in the figure). The whip antenna 12 and the helical antenna 14 are electrically insulated in the following manner.

The outer periphery of the whip antenna 12 is covered with an insulating resin coating layer 16. At the lower end of the whip antenna 12, a lower terminal 22 made of a metal, that is, a conductive sleeve is fitted and fixed so as to be coaxial and conductive to the whip antenna 12. At the lower end of the lower terminal 22, a stopper 24 having an enlarged diameter is provided, and
The engagement with the holder-type terminal 28 fixed to 6 prevents the antenna device 10 from falling off from the portable wireless device main body 26.

On the other hand, an insulating resin core rod 32 is connected to the upper end of the whip antenna 12. The core rod 32 has a shank portion 34 connected to the upper end of the whip antenna 12 and a head portion 35 formed at the upper end of the shank portion 34 and having a larger diameter than the shank portion 34.

An upper terminal 42 made of a metal, that is, a conductive sleeve is coaxially fitted and fixed to the shank portion 34 so as not to conduct to the whip antenna 12. The upper terminal 42 has a stem portion 44 and a connector portion 46 disposed above the stem portion 44 and having a larger diameter than the stem portion 44. Between the stem portion 44 and the connector portion 46, a flange portion 48 that expands in the radial direction is provided. Around the flange 48, a male thread 52 is formed which engages a female thread 64 of the cap 62 in a manner to be described.

Further, a bobbin 56 made of an insulating resin sleeve is coaxially mounted on the shank 34 above the connector 46 so as to be continuous with the upper terminal 42. The bobbin 56 is made of a component integrated with the upper terminal 42 and the helical antenna 14 by molding a resin using the upper terminal 42 and the helical antenna 14 as insert components.

The shaft holes in both sleeves forming the upper terminal 42 and the bobbin 56 have substantially the same uniform inner diameter as the shank portion 34 over substantially their entire axial length. A concave portion 58 is formed at the upper end of the bobbin 56, and the bottom surface of the concave portion 58 contacts the head portion 35 of the core rod 32 so that the upper terminal 42
And a contact surface for positioning the bobbin 56.

The helical antenna 14 is wound around the bobbin 56 in a state where the helical antenna 14 is partially embedded in the peripheral surface of the bobbin 56. The lower end of the helical antenna 14 has a connector 46.
, Whereby the upper terminal 42 and the helical antenna 14 are electrically connected. The connection between the lower end of the helical antenna 14 and the connector 46 is covered with a cover 59 integrally formed with the bobbin 56. The helical antenna 14 includes a bobbin 56 and a cover 59.
As a result, the electrical connection between the upper terminal 42 and the helical antenna 14 becomes more reliable.

An insulating resin cap 62 formed in advance to cover the helical antenna 14 is
Attached to A female screw 64 is formed in the vicinity of the opening of the cap 62, and the female screw 64 and the male screw 52 of the flange 48 are screwed together so that the cap 62 is connected to the upper terminal 42.
Fixed to The inner end surface of the cap 62 has a bobbin 5
6 is brought into contact with the upper end portion of the core rod 32 and the head portion 35 of the core rod 32 to be positioned at a predetermined position. At this time, the lower end of the cap 62 and the lower surface of the flange 48 are substantially aligned.

In the antenna device 10 having such a configuration, when the antenna device 10 is pulled out from the wireless device main body 26, the lower terminal 22 and the holder-type terminal 28 are fitted to each other, and both are conductive. When the antenna device 10 is pushed into the wireless device main body 26, the upper terminal 42 and the holder-type terminal 2
8 are engaged with each other to conduct. That is, when the wireless device is used, the antenna device 10 is pulled out and transmitted and received by the whip antenna 12, and when the wireless device is not used, the antenna device 10 is pushed in and received by the helical antenna 14.

Next, a method of manufacturing the antenna device 10 will be described.

When the antenna device 10 is manufactured, first, the whip antenna 12 is covered with the resin coating layer 16 and the lower terminal 22 is attached to the lower end of the whip antenna 12.
Attach. The resin coating layer 16 can be provided by placing the whip antenna 12 in a mold and molding, or by inserting the whip antenna 12 into a resin tube that has been molded in advance. The lower terminal 22 is connected to the whip antenna 12 before or after the resin coating layer 16 is provided.
Can be mounted on

Next, a resin core rod 32 composed of a shank portion 34 and a head portion 35 is attached to the upper end of the whip antenna 12 covered with the resin coating layer 16. At this time, the upper ends of both the whip antenna 12 and the resin coating layer 16 are embedded in the core rod 32. The core rod 32 can be provided by arranging the whip antenna 12 and the like in a mold and molding.

On the other hand, as shown in FIG. 2A, a metal upper terminal 42 and a helical antenna 14 are separately formed in advance and prepared, and a lower end of the helical antenna 14 is connected to a connector 46 of the upper terminal 42. , The upper terminal 42 and the helical antenna 14 are electrically connected. As a method of fitting the lower end of the helical antenna 14 to the connector 46, a method of attaching the lower end of the helical antenna 14 to the connector 46 and then compressing the lower end from the outside and caulking is adopted. it can.

Next, the upper terminal 42 and the helical antenna 14 connected to each other are arranged in a mold as insert parts, and the bobbin 56 is molded from resin as a part integrated with the upper terminal 42 and the helical antenna 14 ( (See FIG. 2B). At this time, the helical antenna 14 around which the bobbin 56 is wound is partially embedded in the peripheral surface of the bobbin 56. The connection between the lower end of the helical antenna 14 and the connector 46 is covered by a cover 59 integrally formed with the bobbin 56. Thereby, the helical antenna 14 can be securely fixed, and the electrical connection between the upper terminal 42 and the helical antenna 14 can be made more reliable.

Next, as shown in FIG.
6 and the upper terminal 42 in the shaft holes of both sleeves,
Whip antenna 12 and core rod 3 connected to each other
Insert 2. At this time, the head portion 35 of the core rod 32
By inserting the whip antenna 12 and the like until the upper end of the bobbin 56 comes into contact with the recess 58 at the upper end of the bobbin 56, the upper terminal 4 is connected to the whip antenna 12 and the core rod 32.
2. Position bobbin 56 and helical antenna 14. As a method of fixing the upper terminal 42 to the core rod 32, the upper terminal 42 is compressed and caulked from the outside, or an adhesive is used, or the outer diameter of the shank portion 34 and the inner diameter of the upper terminal 42 are fixed. Can be adopted such that the dimensions are set so as to be tightly fitted.

Next, as shown in FIG. 2C, an insulating resin cap 62 separately molded in advance is covered with the flange portion 48 of the upper terminal 42 so as to cover the helical antenna 14.
Attach to At this time, the inner end surface of the cap 62 is
6 until the female screw 64 comes into contact with the upper end of the female screw 64.
Into the male screw 52 of the flange portion 48, and the cap 6
2 is positioned and fixed.

Next, the lower end side of the whip antenna 12 covered with the resin coating layer 16 is passed through the holder type terminal 28,
A stopper 24 is attached to the lower end of the whip antenna 12. Thus, the antenna device 10 shown in FIG. 1 before being attached to the wireless device main body 26 is completed.

According to the antenna device 10 having the above-described configuration, the final stage of the manufacturing method shown in FIGS. 2B and 2C is performed only by assembling parts, not by molding using a mold. Since it can be performed, the final stage can be easily automated. Further, since the shapes of the core rod 32, the upper terminal 42, the bobbin 56, and the like, which are connection parts, are simplified, manufacture of individual parts and assembly of parts are facilitated. Therefore, according to the above-described antenna device 10, the manufacturing cost can be reduced as compared with the conventional structure.

Since there is a hollow portion between the cap 62 and the bobbin 56 and the helical antenna 64,
Even when the diameter of the head of the antenna device 10 is equal to or larger than a predetermined value, the weight can be prevented from increasing. In addition, the cap 62 can obtain necessary mechanical strength with a small thickness by appropriately selecting a material. Therefore, according to the above-described antenna device 10, the weight can be reduced as compared with the conventional structure.

Further, as described above, the helical antenna 14
Is partially embedded in the peripheral surface of the bobbin 56,
The connection between the lower end of the helical antenna 14 and the connector 46 is covered with a covering 59. Therefore, the helical antenna 1
4 is securely fixed, so that the electrical connection between the upper terminal 42 and the helical antenna 14 is more reliable.

In the above-described embodiment, the description has been made assuming that a resin product separately molded in advance is used as the cap 62.
Can be changed so as to be molded using a mold in the final step. Even in this case, the effect of simplification of the shape of the core rod 32, the upper terminal 42, the bobbin 56, and the like, which are connection parts, can be obtained.

In addition, within the scope of the concept of the present invention, those skilled in the art can come up with various modified examples and modified examples, and these modified examples and modified examples fall within the scope of the present invention. I understand.

[0035]

According to the antenna device for a portable radio device according to the present invention, the manufacturing cost of the antenna device can be reduced by simplifying the parts. When the cap is attached to the upper terminal by a screw structure, the manufacturing cost of the antenna device can be reduced by automating the assembly process. In addition, in this case, the hollowing of the inside of the cap can reduce the weight of the antenna device.

[Brief description of the drawings]

FIG. 1 is a partial vertical sectional side view showing an antenna device for a portable wireless device according to an embodiment of the present invention.

2 (a) to 2 (c) are partial vertical sectional side views showing a final stage of a method of manufacturing the antenna device shown in FIG. 1 in the order of steps.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 ... Whip antenna 14 ... Helical antenna 16 ... Resin coating layer 22 ... Lower terminal 24 ... Stopper 26 ... Portable wireless device main body 28 ... Holder type terminal 32 ... Insulating core rod 34 ... Shank part 35 ... Head part 42 ... Upper terminal 44 ... Stem part 46 ... Connector part 48 ... Flange part 52 ... Male screw 56 ... Bobbin 58 ... Recess 62 ... Cap 64 ... Female screw

Claims (6)

[Claims] An insulating core rod having a whip antenna, a shank portion connected to an upper end portion of the whip antenna, and a head portion formed at an upper end portion of the shank portion and having a larger diameter than the shank portion; An upper terminal comprising a conductive sleeve mounted on the core rod and having a stem portion and a connector portion disposed above the stem portion; and an upper terminal disposed above the connector portion so as to be continuous with the upper terminal. A bobbin comprising an insulating sleeve provided and mounted on the core rod, wherein the bobbin abuts on the head portion of the core rod to position the upper terminal and the bobbin with respect to the core rod. Having a contact surface, wound around the bobbin, and electrically connected to the connector portion at a lower end portion. Helical antenna and an antenna device for a portable radio device, characterized by comprising, an insulating cap attached to the upper terminal so as to cover the helical antenna. 2. The bobbin comprises a part integrated with the upper terminal and the helical antenna by molding a synthetic resin using the upper terminal and the helical antenna as insert parts. 1
An antenna device for a portable wireless device according to item 1. 3. The portable wireless device antenna device according to claim 2, wherein the helical antenna has a portion embedded in a peripheral surface of the bobbin. 4. A sleeve according to claim 1, wherein said sleeves forming said upper terminal and said bobbin have substantially the same inside diameter as said shank portion over substantially their entire axial length. The antenna device for a portable wireless device according to any one of claims 1 to 3. 5. The portable wireless device according to claim 1, wherein the contact surface of the bobbin is formed in a concave portion disposed at a substantially upper end of the bobbin. For antenna devices. 6. The upper terminal and the cap have a male screw and a female screw, respectively, and the cap is fixed to the upper terminal by screwing the male screw and the female screw. An antenna device for a portable wireless device according to claim 1.