JP2002299931A - Ground structure of antenna for portable telephone system and portable telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground structure for an antenna capable of surely taking ground with a simple structure and to provide a portable telephone system provided with the ground structure. SOLUTION: An antenna holding part 21a is formed integrally with a metal lower front case 21 to be a metal plate shape protruding from the lower front case 21, and a threaded hole for holding an antenna 30 is provided. When the antenna 30 is screwed into the screw hold of the antenna holding part 21a, the antenna 30 is fixed to the housing and an external conductor part 33 is also electrically connected to the antenna holding part 21a. The antenna holding part 21a also comes into contact with conductive painting 23 applied to the inner face of a lower rear case 22. Thus, the lower front case 21, ground of the antenna 30 and the ground surface (conductive painting 23) of the lower rear case 22 are connected to one another to operate as large ground as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone device, and more particularly to a ground structure of an antenna of the portable telephone device.

[0002]

2. Description of the Related Art When a rod-shaped coaxial antenna is used as an antenna of a portable telephone device, it is necessary to supply power to the antenna element and to ground the outer conductor. Conventionally, as a method of grounding the outer conductor, a ground connection metal is provided on the ground layer on the substrate side of the mobile phone device, and is electrically connected to the outer conductor of the antenna attached to the housing of the mobile phone device. The electrical connection between the ground connection metal fittings on the board side and the outer conductor of the antenna, which has been conducted to the ground plane, is often by contact, but it is necessary to supply power to the antenna element of the antenna from the board side as well. In addition, it is not easy to make two types of connections in the case of a mobile phone device that is becoming smaller and smaller in terms of space, and the shapes of the power supply connection fitting and the ground connection fitting become very complicated.

[0003] When the shapes of the power supply connection fitting and the ground connection fitting are complicated as described above, it is difficult to design an optimal fitting shape, and the contact is insufficient or the contact manner varies. There is a possibility that the unstable characteristics increase and the antenna characteristics deteriorate and the antenna performance varies.

In order to further increase the ground capacitance,
In some cases, the conductor surface of the housing is used as a ground surface and connected to the ground layer of the substrate.

[0005]

Problems to be Solved by the Invention
Japanese Patent Publication No. 3 (1999) -1995 discloses a method of connecting a conventional antenna case to a ground pattern provided on the surface of a multilayer printed board by pressing an antenna case against a contact spring provided on the ground pattern in a retractable antenna. An intermediate ground layer is provided inside, a groove where the intermediate ground layer is exposed is provided at the position where the antenna case is disposed, and the antenna case is pressed against the intermediate ground layer via a conductive elastic body to ensure contact. Is disclosed. However, this method cannot be applied to an antenna having no antenna case.

Japanese Patent Application Laid-Open No. 11-340867 discloses a method of easily connecting a ground portion of a circuit board of a portable wireless communication device to a conductive case. The grounding part is electrically connected to the metal front case during assembly by providing a contact for connection to the ground part of the circuit board, but the power supply of the antenna and the formation of the ground go through the metal piece of the board, respectively. Has been done by the connection.

An object of the present invention is to provide a grounding structure of an antenna which can be reliably grounded with a simple structure, and a portable telephone device provided with the grounding structure.

[0008]

According to the grounding structure of an antenna for a portable telephone device of the present invention, a housing for mounting the antenna is formed of a conductive material, and an antenna holding portion having the same potential as the housing is connected to the housing. Since the antenna is integrally formed and the outer conductor of the antenna is fixed to the antenna holding portion, the mounting of the antenna to the housing and the formation of the grounding structure of the antenna are performed at the same time.

In another aspect, the housing for mounting the antenna is composed of a front case formed of a conductive material and a rear case formed of a non-conductive material, and the antenna holding member has the same potential as the front case. The unit is integrally formed with the front case, and the outer conductor of the antenna is fixed to the antenna holding unit, so that the antenna is mounted on the housing and the ground structure of the antenna is formed. Conductive paint is applied to the inner surface of the rear case, and when the rear case and the front case are fitted, the antenna holding part and the conductive paint come into contact, and the antenna holding part and the conductive paint have the same potential. Structure may be used.

The conductive material is preferably a metal, and the outer conductor of the antenna and the antenna holding portion are fixed to each other by a screw between a male screw provided on the outer conductor of the antenna and a female screw provided on the antenna holding portion. The antenna may be a coaxial antenna having an inner conductor connected to the antenna element and an outer conductor formed around the inner conductor with an insulator interposed therebetween.

A portable telephone device according to the present invention is a portable telephone device provided with an antenna, wherein an upper structure and a lower device of the portable telephone device are formed so as to be foldable via a hinge portion, and the upper device is an upper device. A front case, an upper rear case engaged with the upper front case to form an upper housing, an upper substrate held in the upper housing, an LCD disposed between the upper front case and the upper substrate, and an upper The lower device includes an electric component attached to the substrate, the lower device is a lower front case formed of a conductive material having an integrally formed antenna holding portion, and the lower device is engaged with the lower front case to form the lower housing. A lower rear case made of a non-conductive material to be formed, a lower substrate held in a lower housing, a key sheet disposed between the lower front case and the lower substrate, a lower substrate Equipped with mounted electric parts, power supply fittings arranged on the lower substrate, a battery mounted on the lower rear case, and an antenna screwed into the antenna holder, conductive coating on the inner surface of the lower rear case The antenna has an antenna element, an antenna cap that protects the antenna element, an inner conductor that is electrically connected to the antenna element, and an inner conductor. A cylindrical outer conductor provided around the inner conductor on the outside,
And a cylindrical insulator provided between the inner conductor and the outer conductor to insulate them from each other. The base of the outer conductor is screwed into a female screw provided on the antenna holding portion of the lower front case. Male screws are provided, and the antenna attached to the lower housing is such that the outer conductor penetrates the hole provided on the side surface of the lower rear case, and the male screw provided at the base of the outer conductor is made of a conductive material. It is screwed into a female screw provided on the formed antenna holding portion, is fixed to the lower housing and is electrically connected thereto, and the inner conductor comes into contact with a power supply fitting provided on the lower substrate to supply power from the lower substrate. Receive.

According to the present invention, in order to solve the above-mentioned problems, a plate-like antenna holding portion is integrally provided on a front case made of a conductive material which is stable as ground,
A screw hole is cut in the antenna holding portion made of a conductive material, and the antenna is mounted there. Further, the antenna holding portion made of the conductive material is brought into contact with the conductive painted surface inside the rear case.

By doing so, the grounding of the front case and the rear case, the grounding of the front case and the grounding of the antenna can be simultaneously and stably performed, and the antenna efficiency is degraded due to the instability of the ground, and the antenna performance varies. Can be suppressed.

[0014]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional side view showing a configuration of a mobile phone device according to an embodiment of the present invention.
2A and 2B are side views showing the configuration of the coaxial antenna of FIG. 1, wherein FIG. 2A is a side view, FIG. 2B is a side view with a cap removed, and FIG. It is sectional drawing of the lower structure of FIG.

The ground structure of the antenna 30 for the mobile phone 1 according to the present invention is such that when the antenna 30 having the coaxial structure is mounted on the housing of the mobile phone, the antenna 30 having the coaxial structure is mounted.
This is an antenna grounding structure that performs stable connection between the outer conductor 33, which is the grounding portion, and the grounding surface of the housing and the grounding of the board, and suppresses deterioration of antenna efficiency and variation in antenna performance due to instability of the grounding.

Referring to FIG. 1, the portable telephone device 1 has a structure in which an upper device 10 and a lower device 20 are connected via a hinge 19 and can be folded around the hinge 19. The antenna 30 is mounted on the lower device 20.

The upper device 10 comprises an upper front case 1 provided with an LCD observation window and having a hinge portion 19 at a lower portion.
1, an upper rear case 12 which engages with the upper front case 11 to form an upper housing; an upper substrate 13 supported by the upper front case 11 and the upper rear case 12; L arranged between
It has a CD 16 and an electric component 15 attached to the upper substrate 13.

Referring to FIG. 3, a lower device 20 includes a lower front case 21 and a lower front case 21 each of which is integrally formed with an antenna holding portion 21a and made of a metal material.
, A lower rear case 22 made of a non-conductive mold material forming a lower housing, a lower substrate 24 fixed in the lower housing, a lower front case 21 and a lower substrate 2
Key sheet 2 for key input disposed between
6, electric component 25 attached to lower substrate 24, power supply fitting 27 arranged on lower substrate 24, lower rear case 2
2 and an antenna 30 screwed into the antenna holding portion 21a. The inner surface of the lower rear case 22 is coated with a conductive coating 23. At the time of assembly, the inner surface of the lower rear case 22 is electrically conductive. The paint 23 comes into contact with the antenna holding portion 21a. The lower front case 21 has a hinge 1 that engages with the hinge 19 of the upper device 10.
An antenna holding portion 21a is provided on a side surface on the side of the hinge 9 and the hinge portion, and has a window portion for protecting the key sheet 26 and enabling key operation. Although not shown, lower substrate 2
The ground 4 is electrically connected to the lower front case 21.

Referring to FIG. 2, the antenna 30 includes an antenna element 32 having a helical structure, an antenna cap 31 for protecting the antenna element 32, an inner conductor 35 electrically connected to the antenna element 32, and an inner conductor 35.
Cylindrical outer conductor 3 provided around the inner conductor 35 outside
3, and a cylindrical insulator 34 disposed between the inner conductor 35 and the outer conductor 33 to insulate them. At the base of the outer conductor 33, a male screw is screwed into a female screw provided on the antenna holding portion 21a of the lower front case 21.

When the antenna 30 is mounted on the lower device 20, the outer conductor 33 penetrates a hole provided on the side surface of the lower rear case 22, and a male screw provided on the base of the outer conductor 33 connects with the lower front case 21. The inner conductor 35 comes into contact with the power supply fitting 27 of the lower substrate 24 by being screwed and fixed to a female screw provided on the antenna holding portion 21a.

Next, the function and operation of the embodiment of the present invention will be described with reference to FIG. In FIG. 3, the lower substrate 24
Is output to the power supply fitting 27, and is sent to the antenna element 32 via the inner conductor 35 of the antenna 30 that comes into contact with the power supply fitting 27. Then, power is radiated by the antenna element 32.

The antenna holding portion 21 a is formed integrally with the metallic lower front case 21, is formed of a metal plate projecting from the lower front case 21, and has a screw for holding the antenna 30. The hole has been cut. When the antenna 30 is screwed into the screw hole of the antenna holder 21a, the antenna 30 is fixed to the lower housing, and the outer conductor 33 and the antenna holder 21a are electrically connected. Further, when the lower front case 21 and the lower rear case 22 are fitted to each other, the antenna holding portion 21a comes into contact with the conductive coating 23 applied to the inner surface of the lower rear case 22. Thereby, the lower front case 21 and the antenna 3
The ground 0 and the ground surface (conductive coating 23) of the lower rear case 22 are connected to each other, and together with the ground of the lower substrate connected to the lower front case 21, operate as a large ground as a whole.

That is, by simply screwing the antenna 30 into the lower housing of the portable telephone device 1, the fixing of the antenna 30 and the lower housing and the formation of the ground structure are simultaneously performed, and the connection between the antenna element and the lower substrate is also achieved. Done.

In the above-described embodiment, the portable telephone device 1 is formed of a foldable upper device and a lower device, but may be of an integral structure. The front case and the rear case are provided, but in the case of an integrated structure, each of the front case and the rear case may be one.The front case is made of a conductive metal, and the rear case is a non-conductive mold structure. However, the rear case may be made of a conductive metal. The case to which the antenna is attached is not limited to a metal case, but may be any conductive material, for example, a conductive resin.

[0025]

As described above, the present invention has the following effects. That is, the first effect is that the grounding of the lower front case 21 and the ground of the antenna 30 and the grounding surface (conductive coating 23) of the lower rear case 22 can be simultaneously and easily realized, thereby constructing a large ground as a whole. What you can do.

The reason is that the antenna holding portion 21a, which is integral with the lower front case 21 and projects from the lower front case 21, holds the antenna 30 and is connected to the outer conductor 33 of the antenna 30. Case 2
This is because of contact with the conductive coating 23 applied to the substrate 2.

The second effect is that there is no need to mount a metal fitting for ground connection on the lower substrate 24, and the space required for the lower substrate 24 can be reduced.

The reason is that the lower front case 21 and the antenna holder 21 can be mounted on the lower substrate 24 without mounting a grounding metal fitting on the lower substrate 24 to connect the antenna 30 to the ground.
This is because the outer conductor of the antenna 30 and the lower substrate are connected only by connecting the lower substrate 24 and the lower front case 21 because a is integrated.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view showing a configuration of a mobile phone device according to an embodiment of the present invention.

FIG. 2 is a side view showing a configuration of the coaxial antenna of FIG. 1; (A) is a side view. (B) is a side view with the cap removed.

FIG. 3 is a sectional view of a lower structure of FIG. 1 for explaining a ground structure of the antenna;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cellular phone device 10 Upper device 11 Upper front case 12 Upper rear case 13 Upper substrate 15 Electrical parts 16 LCD 19 Hinge part 20 Lower device 21 Lower front case 21a Antenna holding mechanism 22 Lower rear case 23 Conductive paint 24 Lower side Substrate 25 Electrical component 26 Key sheet 27 Power supply fitting 28 Battery 30 Antenna 31 Antenna cap 32 Antenna element 33 Outer conductor 34 Insulator 35 Inner conductor

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4E360 AB42 EA21 ED02 EE12 GA32 GB26 GC02 GC11 5J046 AA05 AB12 TA07 TA08 UA08 5J047 AA05 AB12 FD01 5K067 AA42 BB04 FF23 KK01 KK17

Claims (7)

[Claims] 1. A grounding structure for an antenna of a mobile phone device, wherein a housing for mounting the antenna is formed of a conductive material, and an antenna holding portion having the same potential as the housing is integrally formed with the housing. The outer conductor of the antenna is fixed to the antenna holding portion, so that the mounting of the antenna to the housing and the formation of the antenna ground structure are simultaneously performed. Construction. 2. A grounding structure for an antenna of a mobile phone device, wherein a housing for mounting the antenna includes a front case formed of a conductive material, and a rear case formed of a non-conductive material. An antenna holding portion having the same potential as the front case is integrally formed with the front case, and an outer conductor of the antenna is fixed to the antenna holding portion, so that the antenna is attached to the housing and an antenna grounding structure is provided. And a grounding structure for an antenna for a mobile phone device. 3. An inner surface of the rear case is coated with a conductive coating, and when the rear case and the front case are fitted, the antenna holding portion and the conductive coating come into contact with each other, and 3. The ground structure of an antenna for a mobile phone device according to claim 2, wherein the portion and the conductive coating have the same potential. 4. The method according to claim 1, wherein the conductive material is a metal.
A grounding structure for an antenna for a mobile phone device according to claim 2. 5. The fixing between the outer conductor of the antenna and the antenna holding portion is performed by screwing a male screw provided on the outer conductor of the antenna with a female screw provided on the antenna holding portion. A grounding structure for an antenna for a mobile phone device according to claim 1 or 2. 6. The antenna according to claim 1, wherein the antenna has an inner conductor connected to an antenna element and an outer conductor formed around the inner conductor with an insulator interposed therebetween. An earthing structure for an antenna for a portable telephone device according to any one of claims 2 and 5. 7. A mobile phone device provided with an antenna, wherein an upper structure and a lower device of the mobile phone device are formed so as to be foldable via a hinge portion, wherein the upper device includes an upper front case and the upper device. An upper rear case that engages with the front case to form an upper housing;
An upper substrate held in the upper housing, an LCD disposed between the upper front case and the upper substrate, and an electric component attached to the upper substrate, wherein the lower device is integrally formed. A lower front case made of a conductive material having an antenna holding portion, a lower rear case made of a non-conductive material engaged with the lower front case to form a lower housing, and the lower housing A lower substrate held in the body, a key sheet disposed between the lower front case and the lower substrate, an electric component mounted on the lower substrate, and a power supply fitting disposed on the lower substrate , A battery attached to the lower rear case, and an antenna screwed into the antenna holding portion, the inner surface of the lower rear case is coated with a conductive paint, and the conductive The coating is in contact with the antenna holding portion, and the antenna includes an antenna element, an antenna cap for protecting the antenna element, an inner conductor electrically connected to the antenna element, and the inner conductor outside the inner conductor. A cylindrical outer conductor provided so as to surround, and a cylindrical insulator provided between the inner conductor and the outer conductor to insulate them from each other, and the base of the outer conductor has the lower side. A male screw that is screwed into a female screw provided in the antenna holding portion of the front case is provided, and the antenna attached to the lower housing has a hole provided on a side surface of the lower rear case. A conductor penetrates, and a male screw provided at a base of the outer conductor is screwed to a female screw provided at the antenna holding portion formed of a conductive material and fixed to the lower housing. Both electrically connected to the can in the conductor being contacted to the power feeding from said lower substrate and the feeding metal pipe provided on the lower substrate, a cellular phone device, characterized in that.