JP2003264414A - Foldable portable radio terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further miniaturize a foldable radio communication terminal. <P>SOLUTION: A longitudinal direction of a grounding conductor substrate 23 is shortened by the length a1 in the width direction of a ground axial member 20, a lower casing 3 that stores the grounding conductor substrate 23 can be miniaturized in comparison with the conventional grounding conductor substrate 101 and thus, a foldable cellular telephone 1 itself can be miniaturized by using the ground shaft 20 stored inside a hinge part 4 as a ground by electrically connecting it with the grounding conductor substrate 23 stored inside the lower casing 3 and a conductive member 26 of a planar antenna 25 stored inside an upper casing 2 in the foldable cellular telephone 1. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable portable wireless terminal, and is suitable for application to, for example, a foldable portable telephone in which a first casing and a second casing are connected via a hinge portion. It is something.

[0002]

2. Description of the Related Art In recent years, a foldable type in which a first casing and a second casing are foldably formed via a hinge portion so that the portable telephone can be easily carried with the tendency toward miniaturization. Mobile phones are widely used.

[0003]

By the way, in the folding portable telephone having such a structure, the antenna provided in the folding portable telephone is desired by appropriately selecting the size of the grounding conductor substrate used as the ground. It is designed to operate in the frequency bandwidth of.

Therefore, in the foldable mobile phone, it is necessary to secure a space for accommodating the ground conductor board in at least one of the first housing and the second housing. There is a problem in that it is difficult to reduce the size of either the first housing or the second housing to be housed, and as a result, it is difficult to downsize the foldable mobile phone itself.

The present invention has been made in consideration of the above points, and an object thereof is to propose a foldable portable wireless terminal which can be further downsized.

[0006]

In order to solve the above problems, according to the present invention, a foldable portable radio in which a first casing and a second casing are formed so as to be foldable or expandable via a hinge portion. In the terminal, the antenna element accommodated in the first casing or the second casing and the inside of the hinge portion are accommodated,
In addition, a grounding conductor member that is electrically connected to the antenna element and functions as a grounding plate for the antenna element is provided.

Therefore, in the foldable portable radio terminal, by using the grounding conductor member housed inside the hinge part as a part of the grounding plate, it is possible to operate the conventional antenna element in a desired frequency bandwidth. The size of the grounding plate can be made smaller than the size of the grounding plate, and thus the size of the housing that houses the grounding plate can be made smaller.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a foldable mobile phone according to the present invention as a whole, which includes a first housing (hereinafter referred to as an upper housing) 2 and a second housing (hereinafter, referred to as an upper housing) substantially on a box. A lower housing 3) is foldably connected via a hinge portion 4.

A speaker 5 is provided at the center of the upper end of the front surface 2A of the upper housing 2, and the voice of the other party in a call is output through the speaker 5.

On the front surface 2A of the upper housing 2, a liquid crystal display 6 is provided below the speaker 5, and the liquid crystal display 6 receives radio waves, the remaining battery level, and the other party registered as a telephone directory. The previous telephone number and outgoing call history are displayed.

On the other hand, on the front surface 3A of the lower housing 3 as a gripping housing, numeral keys "0" to "9", a calling key, a redial key, an end call and power key, a clear key, An operation unit 7 including various operation keys such as a memo key is provided, and various commands can be input through these operation keys.

On the front surface 3A of the lower housing 3, an operating portion 7 is provided.
A microphone 8 is provided below the microphone, and the microphone 8 collects the voice of the user during a call.

In addition to this structure, a cylindrical ground shaft member 20 is fixedly housed inside the hinge portion 4 along the longitudinal direction of the hinge portion 4, and the ground shaft member 20 is used as a center. Part of the lower end of the upper housing 2 and part of the upper end of the lower housing 3 are connected to each other.

The ground shaft member 20 as a ground conductor member is made of a metal member so that the physical strength of the hinge portion 4 itself can be improved.

As shown in FIGS. 2 (A) and 2 (B), the ground shaft member 20 housed inside the hinge portion 4 has rotatable portions of lower bearing members 21A and 21B rotatably provided at both ends thereof. The lower bearing members 21A and 21B are axially supported.
The joint portions of are fixed to both ends of the belt-shaped connecting member 22.

The connecting member 22 is fixed to the front surface 23A of the ground conductor board 23 near the hinge portion 4 so as to connect the ground shaft member 20 to the ground conductor board 23 via the lower bearing members 21A and 21B. Has been done.

The ground conductor board 23 is used as a mounting target on which various circuits (not shown) for wireless communication are mounted, and is also used as a ground.

As a result, in the foldable mobile phone 1, the ground shaft member 20 and the ground conductor board 23 are electrically connected to each other so that the ground shaft member 20 is used as the ground together with the ground conductor board 23. There is.

In this case, an overall view of the foldable mobile phone 1 is omitted, and FIG. 3A in which the same parts as those in FIG. With reference to FIG. 3B, by using the ground shaft member 20 as a ground in the lower housing 3,
In the conventional ground conductor board 101, this is the same as storing the same length a2 as the width a1 of the ground shaft member 20 in the width direction in the space of the hinge portion 102, and the ground conductor board 101 has the length a2. The grounding conductor board 23, which is shortened and downsized, can be accommodated.

Therefore, the lower casing 3 has the same length a2 as the longitudinal length H1 of the conventional lower casing 100.
By making the length H2 shorter by 3 and making the longitudinal direction a length H2 shorter than the length H1, the lower housing 3 itself is further downsized.

By the way, the rotating portion of the upper bearing member 24 is rotatably supported at the center of the ground shaft member 20, and the joint portion of the upper bearing member 24 is built in the upper casing 2. For example, it is fixed to the conductive member 26 of the plate-shaped antenna 25 (FIG. 2) which is a plate-shaped inverted F antenna.

In the foldable mobile phone 1, the grounding conductor board 23 and the connecting member 22 housed inside the lower housing 3 are provided.
Or the conductive member 26 housed inside the upper housing 2 and the ground shaft member 20 housed inside the hinge portion 4,
The upper bearing member 24 and the lower bearing members 21A and 21B are used as a ground for the plate antenna 25.

The plate-shaped antenna 25 has a conductive member 26 to which the other end of the upper bearing member 24 is electrically connected.
, The dielectric 27, and the radiation conductor 28 formed in a substantially rectangular shape.
The radiation conductor 28 is attached from the rear surface 2B side of the upper housing 2 in a state where the dielectric 27 is in contact with the conductive member 26 provided on the front surface 2A side of the upper housing 2. It is designed to be fixed.

Incidentally, the plate-shaped antenna 25 includes the lower housing 3
A power supply line (not shown), which is a coaxial line routed from the wireless circuit mounted on the ground conductor board 23 inside the inside of the hinge via the inside of the hinge portion 4, is electrically connected, and is connected via the power supply line. The plate-shaped antenna 25 operates as an antenna by being fed with electric power from a wireless circuit.

At this time, the plate antenna 25 is connected to the speaker 5
By being provided in the vicinity of the hinge portion 4 which is distant from the liquid crystal display 6 and the liquid crystal display 6, the deterioration of the antenna characteristics of the plate antenna 25 is not affected by the high frequency current flowing in the speaker 5 and the liquid crystal display 6. It is designed so that it can be prevented.

In the foldable mobile phone 1, the plate antenna 25 is provided near the hinge portion 4 of the upper casing 2 so that the plate antenna 25 is provided at the upper end of the upper casing 2. Therefore, the power supply line can be shortened, and the transmission loss of the high frequency current by the power supply line can be surely reduced.

In the above configuration, the folding mobile phone 1
Then, the ground shaft member 20 housed inside the hinge portion 4
Is electrically connected to the plate antenna 25 housed inside the upper housing 2 via the upper bearing member 24, and the ground shaft member 20 is connected to the lower bearing members 21A and 21B and the connecting member 22. The ground conductor board 23 housed inside the lower housing 3 is electrically connected.

Therefore, in the foldable mobile phone 1, the ground shaft member 20 provided inside the hinge portion 4 is used as the ground together with the ground conductor substrate 23 and the conductive member 26 of the plate-shaped antenna 25, so that the ground shaft member is provided. The length of the ground conductor board 23 in the width direction 20 of the width 20 (FIG. 3) can be shortened to reduce the size of the ground conductor board 23, and thus the lower housing 3 that houses the ground conductor board 23 can be downsized.

Further, in the foldable mobile phone 1, a plate antenna 25 is provided near the hinge portion 4 of the upper housing 2 which the user does not grip with the hand when compared with the lower housing 3 during a call. Thereby, even when the user grips the plate-shaped antenna 25, it is possible to prevent the radio wave from being shielded by the plate-shaped antenna 25, and thus effectively prevent the deterioration of the antenna characteristics of the plate-shaped antenna 25 itself. .

Further, in the foldable mobile phone 1, the radiation conductor 28 of the plate antenna 25 is provided in the vicinity of the hinge portion 4 of the upper housing and on the back surface 2B side, so that the plate antenna 25 can be moved from the user's head. Can be the furthest away, and thus the upper housing 2 located near the user's ear during a call
Local average SAR (Specific SAR), which is the amount per unit time and unit mass that is absorbed by a specific site (mainly the head) via
The maximum value of (Absorption Rate) can be reduced.

According to the above configuration, the foldable mobile phone 1
Then, the ground shaft member 20 housed inside the hinge portion 4
Is electrically connected to the ground conductor board 23 housed in the lower housing 3 and the conductive member 26 of the plate antenna 25 housed in the upper housing 2 and used as a ground. In comparison with the conventional ground conductor board 101, the longitudinal direction of the ground conductor board 23 is shortened by the length a1 in the width direction of the ground shaft member 20, and the lower housing 3 that houses the ground conductor board 23 is downsized. Thus, the foldable mobile phone 1 itself can be downsized.

In the above-described embodiment, when the length of the lower housing 3 is shortened by the length a3 (FIG. 3), the foldable mobile phone 1 itself is downsized. However, the present invention is not limited to this, and the lower housing 3 is not downsized, but various devices such as a camera and a grounding conductor board are provided in a space having a size corresponding to the length a3. However, in this case, the degree of freedom in designing the folding mobile phone itself can be increased.

Here, in the folding type portable telephone in which the ground conductor board is housed in the space having a size corresponding to the length a3, the ground can be surely enlarged by the width a1 of the ground shaft member 23 in the width direction. Therefore, it is possible to further widen the frequency bandwidth in which the plate antenna operates.

Further, in the above-described embodiment, the folding portable wireless terminal of the present invention is a folding type in which the ground conductor board 23 is housed inside the lower housing 3 in order to select a predetermined ground size. Although the case where the present invention is applied to the mobile phone 1 has been described, the present invention is not limited to this, and in order to select a predetermined ground size, not only the lower case 3 but also the upper case 2 is provided with a ground conductor board. Foldable mobile phone and upper case 2
It may be applied to a foldable mobile phone in which the grounding conductor board is housed only inside, and in this case, the same effect as that of the above-described embodiment can be obtained.

Further, in the above-described embodiment, the case where the plate-shaped inverted F antenna is applied as the plate-shaped antenna 25 has been described, but the present invention is not limited to this, and the ground shaft member 20 is used as the ground. Various other antennas such as a plate-shaped inverted L antenna, a plate-shaped loop antenna, a microstrip antenna, a patch antenna and the like may be applied as long as they can be used. It should be noted that by making slits or cuts in the radiation conductor 26 of the plate antenna 25, the plate antenna 25 itself can be further downsized.

Further, in the above-mentioned embodiment, the case where the folding mobile phone 1 is applied as the folding portable radio terminal has been described, but the present invention is not limited to this, and the first and second embodiments are not limited thereto. If the housing of the PDA (Personal Digital Assist
ant) and other various folding portable wireless terminals.

[0038]

As described above, according to the present invention, it is necessary to operate the antenna element in a desired frequency bandwidth by using the ground conductor member housed inside the hinge portion as a part of the ground plate. It is possible to realize a foldable portable wireless terminal that can be made smaller than a conventional grounding plate, and can be further reduced in size.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an external configuration and an internal structure of a folding mobile phone according to the present invention.

FIG. 2 is a schematic cross-sectional view showing an internal configuration of a foldable mobile phone.

FIG. 3 is a schematic cross-sectional view for explaining the downsizing of the lower housing.

[Explanation of symbols]

1 ... Folding type mobile phone, 2 ... Upper case, 3 ... Lower case, 4 ... Hinge part, 20 ... Ground shaft member, 21
A, 21B ... Lower bearing member, 22 ... Connecting member, 23
...... Grounded conductor board, 24 …… Upper bearing member, 25 …… Plate antenna, 26 …… Conductive member, 27 …… Dielectric material, 2
8 ... Radiating conductor.

Claims (5)

[Claims] 1. A foldable portable wireless terminal in which a first housing and a second housing are formed so as to be foldable or expandable via a hinge portion, wherein the first housing or the second housing is provided. A fold comprising: an antenna element housed in the body; and a ground conductor member housed inside the hinge portion and electrically connected to the antenna element to function as a ground plate for the antenna element. Tatami portable wireless terminal. 2. The ground conductor member is housed in the first and / or second casing, and is electrically connected to the antenna element and electrically connected to the ground conductor substrate that functions as a ground plate for the antenna element. The foldable portable wireless terminal according to claim 1, wherein the foldable portable wireless terminal is connected to. 3. A gripping housing for a user to grip when using a telephone call in one of the first and second housings, and the antenna is provided in the other housing that is not the gripping housing. The foldable portable wireless terminal according to claim 1, further comprising an element. 4. The foldable portable wireless terminal according to claim 3, wherein the antenna element is provided on the back side away from the user when using a call in the housing. 5. The foldable portable wireless terminal according to claim 4, wherein the antenna element is a plate-shaped antenna.