JPH1155023A - Helical antenna, its manufacture and combined antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a helical antenna excellent in antenna characteristics and capable of being easily manufactured with less man-hour by providing a bobbin that is constituted of non-conductive material having an axial direction and a helical antenna part that spirally winds wire in the axial direction of the bobbin. SOLUTION: This antenna has a bobbin 11 that is constituted of non- conductive material, a helical antenna part 12 which spirally winds wire around the bobbin 11, a 1st terminal 13 that is screwed into a sleeve, a 2nd terminal 14 which is connected to the terminal 13 and connects one end of the wire and a 3rd terminal which connects the other end of the wire. Further the antenna is provided with an engaging part 111 that engages a jig for turning which is used at the time of winding the wire and a spiral groove part that guides at the time of winding the wire and also prevents the wire from being displaced. The part 12 is formed by engaging the part 111 with an automatic winding machine, rotating the bobbin 11 and spirally winding the wire. Thus, the antenna can easily be manufactured with less man-hour.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical antenna applied to an antenna device used for a communication device such as a portable telephone.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing the structure of a composite antenna device including a conventional helical antenna. In FIG. 6, this composite antenna device is a separate composite antenna device in which a helical antenna and a whip antenna are integrated and electrically independent. The composite antenna device includes a helical antenna including an antenna guide 61 made of a non-conductive material such as nylon and a helical coil 62 attached to the antenna guide 61, a helical antenna and a transceiver for a wireless circuit such as a mobile phone (not shown). 71 as a contact member for electrically contacting and separating the
And an insulator 72 made of a non-conductive material such as nylon for electrically separating the antennas from each other, and a contact attached to an end of the insulator 72 and electrically connected to and separated from the transmitting / receiving section of the radio circuit in the same manner as the sleeve 71. Rod-shaped whip antenna 81 having a child member (not shown), and antenna cover 8 attached to the outer periphery of whip antenna 81
2 and an antenna top 91 formed so as to cover a part of the helical antenna and the sleeve 71. The sleeve 71 and the whip antenna 81 are reciprocally connected to a transmitting / receiving unit of a wireless circuit such as a mobile phone by an operation such as “storage in the housing” / “pull out from the housing” of the mobile phone (not shown). Make electrical contact. That is, for example, switching to a helical antenna / whip antenna is performed according to an operation such as storage / drawing out.

Next, a method of manufacturing the composite antenna device will be described. First, the antenna guide 61, the sleeve 71,
And the insulator 72 is integrally formed like insert molding. Note that a whip antenna 81 is also integrally formed at the end of the insulator 72. Next, as shown in FIG. 6, the assembly obtained in the above process is fixed, and a helical coil 62 (having a wire diameter of (For example, 0.6 mm). The helical coil 62 is screwed until it comes into contact with the flange of the sleeve 71, and the end of the helical coil 62 is pressed into the sleeve 71 or made conductive by soldering or the like. Thereafter, an antenna top 91 is formed so as to cover a part of the helical antenna and the sleeve 71. An antenna cover 82 is attached to the outer periphery of the whip antenna 81.

[0004]

In the conventional method of manufacturing a helical antenna in a composite antenna device, there is an operation step of screwing a helical coil 62 to an antenna guide 61 as shown in FIG. However, the helical coil 62 is fixed to the antenna guide 61 so that the pitch and shape of the helical coil 62 do not shift or deteriorate due to resin pressure or the like when the antenna top 91 is formed in a subsequent process. They are often designed tight without gaps. Therefore, the helical coil 62
A relatively large force is required for screwing into the antenna guide 61. In particular, when this step is performed manually, the labor borne by the operator is very large. In addition, since the helical coil 62 is manufactured in advance, and the helical coil 62 is screwed to the antenna guide 61, the method for manufacturing the helical antenna requires many steps.

It is an object of the present invention to provide a helical antenna which has excellent antenna characteristics, requires less man-hours, and can be easily manufactured.

[0006]

According to the present invention, there is provided a bobbin made of a non-conductive material having an axial direction, and a helical antenna portion formed by spirally winding a wire in the axial direction of the bobbin. Is obtained.

According to the present invention, the first terminal is attached to one end of the bobbin in the axial direction, and is screwed to a sleeve as a contact member electrically connected to and separated from a transmitting / receiving section of a radio circuit; The helical antenna is attached to the outer periphery of one end in the axial direction and connected to the first terminal, and has a second terminal for connecting one end of the wire.

According to the present invention, there is further obtained the helical antenna in which the first and second terminals are attached to the bobbin by insert molding.

According to the present invention, the bobbin has, at the other end in the axial direction, an engaging portion which engages with a rotating jig used when the wire is spirally wound. A helical antenna is obtained.

According to the present invention, the bobbin further includes a spiral groove on the outer peripheral surface thereof for guiding the wire in a spiral shape and preventing the wound wire from being displaced. Is obtained.

According to the present invention, there is further provided a method for manufacturing the helical antenna, wherein the helical antenna is formed by rotating the bobbin and spirally winding the wire in the axial direction. .

According to the present invention, further, the helical antenna, and a rod-shaped whip antenna having a contact member attached to the sleeve via a non-conductive material and electrically connected to and separated from a transmission / reception unit of a radio circuit. , And the sleeve and the whip antenna are reciprocally electrically connected to and separated from the transmission / reception unit of the wireless circuit.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A helical antenna according to an embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are a perspective view and a sectional view, respectively, showing the configuration of the helical antenna according to the present embodiment. Referring to FIGS. 1 and 2, the present helical antenna includes a bobbin 11 made of a non-conductive material such as nylon having an axial direction, and a helical antenna portion formed by spirally winding a wire in the axial direction of bobbin 11. A first terminal 13 which is attached to one end of the bobbin 11 in the axial direction and which is screwed to a sleeve (described later) as a contact member which is electrically connected to and separated from a transmitting / receiving unit of a wireless circuit such as a cellular phone (not shown); And a second terminal 14 attached to the outer periphery of one end of the bobbin 11 in the axial direction, connected to the first terminal 13 and connected to one end of the wire, and an outer periphery of the other end of the bobbin 11 in the axial direction. A third attached to connect the other end of the wire
Terminal 15. The first, second, and third terminals 13, 14, and 15 are attached to the bobbin 11 by insert molding. In addition, the second and third terminals 14 and 15 are subjected to soldering or the like after the ends of the wires are tangled.

Further, in the helical antenna of the present invention, the other end of the bobbin 11 in the axial direction is provided with an engaging portion 111 for engaging with a rotating jig (described later) used for spirally winding the wire. Have. A spiral groove is formed on the outer peripheral surface of the bobbin 11 for guiding the wire in a spiral shape and for preventing the wound wire from being displaced.

FIG. 3 is a sectional view showing a configuration of a composite antenna device including the helical antenna. In FIG.
This composite antenna device is a separate composite antenna device in which a helical antenna and a whip antenna are integrated and electrically independent. The composite antenna device includes a sleeve 21 as a contact member for electrically connecting and disconnecting the helical antenna shown in FIGS. 1 and 2 and a transmitting / receiving unit of a wireless circuit such as a mobile phone (not shown). And an insulator 22 made of a non-conductive material such as nylon and electrically separating the antennas from each other; and a contact attached to the end of the insulator 22 and electrically connected to and separated from the transmitting / receiving section of the radio circuit in the same manner as the sleeve 21. It has a rod-shaped whip antenna 31 having members (not shown), an antenna cover 32 attached to the outer periphery of the whip antenna 31, and an antenna top 41 formed so as to cover a part of the helical antenna and the sleeve 21. doing. The sleeve 21 and the whip antenna 31 are reciprocally connected to a transmitting / receiving unit of a wireless circuit such as a mobile phone by an operation such as “storage in the housing” / “pull out from the housing” of the mobile phone or the like (not shown). Make electrical contact. That is, by storing / drawing out the composite antenna device, the antenna is switched to a helical antenna / whip antenna.

Next, a method for manufacturing the helical antenna will be described. First, the bobbin 11 and the first to third terminals 1
An assembly consisting of 3 to 15 is integrally formed by insert molding. FIG. 4 shows the bobbin 11 and the first
It is sectional drawing which shows the state which attached the said assembly which consists of-3rd terminal 13-15 to the rotation jig. As shown in FIG. 4, the bobbin 11 attached by rotating the engaging portion 111 with a rotating jig 200 which is a part of an automatic winding machine (not shown) is rotated, and the bobbin 11 is rotated in the axial direction and along the spiral groove portion. And a not-shown wire (the wire diameter is, for example, 0.6 m
m) is spirally wound to form the helical antenna unit 12. Before winding, one end of the wire is connected to the second terminal 1.
4 is wrapped, soldered, etc., wound at a predetermined pitch and length, and the other end cut is wrapped and soldered to the third terminal 15. As described above, FIG.
2 and the helical antenna shown in FIG. 2 was manufactured.

Next, a method of manufacturing the composite antenna device shown in FIG. 3 using the helical antenna will be described. First,
The sleeve 21 and the insulator 2 which are respectively manufactured in advance
2, and the whip antenna 31 are integrally formed as in insert molding. In addition, a female thread portion is formed at one end of the sleeve 21. Next, the first terminal 13 of the helical antenna manufactured by the above manufacturing method is screwed into the sleeve 21 of this assembly. Due to this screwing, the helical antenna section 12 and the sleeve 21 were conducted through the first and second terminals 13 and 14. Next, an antenna top 41 is formed so as to cover the helical antenna and a part of the sleeve 21. An antenna cover 32 is attached to the outer periphery of the whip antenna 31. As described above, the composite antenna device shown in FIG. 3 was manufactured.

In this embodiment, an example has been described in which the helical antenna according to the present invention is applied to a separate-type composite antenna device. However, this helical antenna is electrically connected to the helical antenna, the sleeve, and the whip antenna. It is also possible to apply the present invention to an integrated combined antenna device or an antenna device consisting of a single helical antenna.

[0020]

The helical antenna according to the present invention has a bobbin made of a non-conductive material having an axial direction and a helical antenna portion formed by spirally winding a wire in the axial direction of the bobbin. Not only the antenna characteristics are excellent, but also the number of steps is small and the antenna can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a helical antenna according to an embodiment of the present invention.

FIG. 2 is a sectional view of the helical antenna shown in FIG.

FIG. 3 is a cross-sectional view showing a configuration of a composite antenna device to which the helical antenna shown in FIG. 1 is applied.

FIG. 4 is a cross-sectional view for explaining a method for manufacturing the helical antenna shown in FIG.

FIG. 5 is a cross-sectional view showing a configuration of a composite antenna device to which a helical antenna according to a conventional example is applied.

FIG. 6 is a side view for explaining a method for manufacturing a helical antenna according to a conventional example.

[Explanation of symbols]

 11, 61 bobbin 12 helical antenna section 13 first terminal 14 second terminal 15 third terminal 21, 71 sleeve 22, 72 insulator 31, 81 whip antenna 32, 82 antenna cover 41, 91 antenna top 62 helical coil 111 Engagement part 200 Jig for rotation

Claims (7)

[Claims] 1. A helical antenna comprising: a bobbin made of a non-conductive material having an axial direction; and a helical antenna portion formed by spirally winding a wire in the axial direction of the bobbin. 2. A first terminal which is attached to one end of the bobbin in the axial direction and which is screwed to a sleeve as a contact member electrically connected to and separated from a transmission / reception unit of a radio circuit, and an outer periphery of one end of the bobbin in the axial direction. The helical antenna according to claim 1, further comprising a second terminal connected to the first terminal and connected to one end of the wire. 3. The bobbin according to claim 1, wherein the first and second terminals are attached to the bobbin by insert molding.
Or the helical antenna according to 2. 4. The bobbin according to claim 1, further comprising, at the other end in the axial direction, an engaging portion that engages with a rotating jig used when the wire is spirally wound. The helical antenna according to any one of the above. 5. The bobbin is provided with a spiral groove on its outer peripheral surface for guiding the wire in a spiral manner and preventing the wound wire from being displaced. A helical antenna according to any one of claims 1 to 4. 6. The helical antenna according to claim 1, wherein the bobbin is rotated and the wire is spirally wound around the bobbin to form the helical antenna. Production method. 7. A helical antenna according to claim 2, further comprising: a contact member attached to said sleeve via a non-conductive material and electrically connected to and separated from a transmission / reception unit of a radio circuit. A composite antenna device integrally including a rod-shaped whip antenna, wherein the sleeve and the whip antenna are reciprocally electrically connected to and separated from a transmission / reception unit of a wireless circuit.