JP2006180170A - Folding type portable radio set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding type portable radio set which can be made small in size and reduced in local SAR and can secure high antenna performance even in a communication state. <P>SOLUTION: A conductive metal frame 11 mounted on an upper housing 1 and hinge metal fittings 14 are connected together and hinge metal fittings 31 and hinge metal fittings 32 are connected rotatably by a rotary shaft 33; and an antenna element 4 is electrically connected to a matching circuit 22 on a circuit board 21 and a conductor element 5 is arranged at a notch part 31A of the hinge metal fittings 31. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a foldable portable wireless device.

  Recently, mobile phones have been widely used, and in particular, foldable mobile phones that can be opened and closed by connecting upper and lower housings by hinges are widely used. This foldable mobile phone can be installed in a large size as a display screen in the open state (open state), and has two advantages that it can be stored in a compact shape in the closed state (closed state). Yes.

  Furthermore, in recent years, there has been a demand for weight reduction of the folding cellular phone. For this reason, for example, as described in Patent Document 1, the hinge portion and the like are made of resin to reduce the weight. Things have been proposed. However, when the hinge is formed of resin, there is a problem that the mechanical strength becomes weak.

  Therefore, in order to reduce the weight of the folding cellular phone, for example, cutting the metal of the hinge portion to reduce the weight has been studied. However, in such a foldable mobile phone, the antenna current density is concentrated at the notch, and the local average SAR (Specific Absorption Rate) increases. Furthermore, since the current component in the casing width direction is reduced, there arises a problem that the antenna gain in a call state is deteriorated.

  By the way, as a conventional antenna for a foldable portable wireless device, for example, as disclosed in the same Patent Document 1, an antenna element is disposed inside an upper housing and a feed line passing through a hinge portion is used. There has also been proposed a lever feeding power to the antenna element from the lower housing. However, in such a configuration that feeds power to the antenna element of the upper casing, the antenna element of the upper casing is close to the ear. In other words, since the antenna element is close to the human head, there is a problem that it is difficult to reduce the local average SAR.

Further, among the conventional folding portable wireless devices, for example, in the configuration of Patent Document 1, the antenna current flows over almost the entire lower housing, so that the user is in a talking state. There is a problem that the antenna performance deteriorates when the lower case is gripped by the hand. In the radiation characteristics, the main polarization is in the longitudinal direction of the casing. Therefore, when the folding portable wireless device is tilted and held in a talking state, the main polarization becomes substantially horizontal with respect to the ground. As a result, there is a problem that the incoming wave from the base station antenna, which is generally vertically polarized, does not coincide with the polarization direction, and communication quality deteriorates. Under such circumstances, low SAR and high antenna performance in a call state are required.
JP 2001-156898 A

  The present invention has been made in view of the above circumstances, and provides a foldable portable radio device that can reduce the local SAR as well as reduce the weight, and can ensure high antenna performance even in a call state. is there.

  A foldable portable wireless device according to the present invention includes a first housing, a second housing, a hinge portion that rotatably connects the first housing and the second housing, and an antenna element. The hinge part has a conductive metal having a notch, and the antenna current distributed in the conductive metal is dispersed in the notch. With this configuration, the weight can be reduced, the local SAR can be reduced, and high antenna performance can be ensured even in a call state.

  The foldable portable wireless device of the present invention includes a first housing, a second housing, a hinge portion that rotatably connects the first housing and the second housing, and the first housing. An antenna element provided in one housing, a circuit board provided in the second housing and having a ground pattern, and a power feeding unit connected to a wireless circuit on the circuit board, the hinge part being A first hinge portion and a second hinge portion made of conductive metal; and a connecting portion that electrically connects the first hinge portion and the second hinge portion and rotatably supports the first hinge portion and the second hinge portion. The first hinge portion is provided in the first housing and is electrically connected to an end portion of the antenna element on the hinge portion side, and the second hinge portion is connected to the second housing. And the power supply unit disposed at a predetermined interval from a ground pattern on the circuit board. A conductive element having a notch part in a part thereof as a constituent element of the hinge part and dispersing the antenna current distributed in the conductive metal. It becomes the structure arrange | positioned in a notch part. With this configuration, the weight can be reduced, the local average SAR can be kept low, and high antenna performance can be ensured in a call state.

  Moreover, the foldable portable radio apparatus of the present invention has a configuration in which the conductor element is electrically connected to the conductor portion of the hinge portion. With this configuration, a part of the antenna current can be shunted to the conductor element, and the antenna current in the conductor portion of the hinge portion can be reduced, so that the local average SAR can be kept low. In addition, since the current component in the housing width direction can be increased, high antenna performance can be ensured in a call state.

  Moreover, the foldable portable radio apparatus according to the present invention has a configuration in which the conductor element is disposed close to the conductor portion of the hinge portion at a predetermined interval. With this configuration, since the antenna current is dispersed and collected in part by electromagnetically coupling to the conductor element, in other words, the antenna current is made as uniform as possible. The local average SAR can be kept low. In addition, high antenna performance can be ensured in a call state.

  According to the present invention, the first housing, the second housing, the hinge portion that rotatably connects the first housing and the second housing, and the antenna element are provided, and a part of the hinge portion is provided. In addition to providing a conductive metal having a notch in the conductor, and disposing a conductor element that disperses the antenna current distributed in the conductive metal in the notch, it is possible to reduce the local average SAR while reducing the weight. It is possible to provide a foldable portable wireless device that ensures high antenna performance in a call state.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[First Embodiment]
1 and 2 show a foldable portable wireless device according to a first embodiment of the present invention. An upper casing (which constitutes a “first casing”) 1 and a lower casing (“ 2) constituting the “second housing” are connected by a hinge portion 3, and the antenna element 4 is provided in the lower housing 2. In addition, the upper housing | casing 1 and the lower housing | casing 2 are comprised by the resin molded product which is an insulator.

  A metal frame 11 is attached to the upper housing 1 on the surface on the + X side of the upper housing 1, that is, the surface on which a display unit generally composed of a large screen is disposed. The metal frame 1 is generally made of a metal having high conductivity, light weight and high strength, such as a magnesium alloy. Thereby, the intensity | strength of the upper housing | casing 1 which is a thin shape is securable.

  The lower housing 2 is provided with a circuit board 21 over substantially the entire interior, and a matching circuit 22 and a wireless circuit 23 are installed on the circuit board 21.

The hinge part 3 is configured by hinge metal fittings 31 and 32, a rotation shaft 33 (specifically, rotation shafts A and 33B), and the like. Among them, the hinge fitting 31 (which constitutes the conductive metal) is formed of an appropriate conductive metal having a required strength, and is cut out for weight reduction as shown in the perspective view of FIG. The structure has a portion 31A. The hinge bracket 31 of the present embodiment has, for example, a width of about 10 mm in the (Y) direction orthogonal to the longitudinal direction of the upper and lower casings 1 and 2 and in the longitudinal direction of the upper and lower casings 1 and 2. A notch 31A is formed with a length of about 5 mm in the parallel (Z) direction. The cutout portion 31A has a structure filled with a part of the lower housing 2 formed of resin, and compensates for a decrease in structural strength due to the provision of the cutout portion 31A. . Further, the conductor element 5 for dispersing the antenna current distributed in the hinge metal fitting 31 (conductive metal) is disposed in the notch 31A.
Note that the hinge fitting 31 is mechanically fixed to the upper casing 1 by attaching the hinge fitting 31 to the upper casing 1 together with the metal frame 11 by means of mounting screws 31B. Moreover, the hinge metal fitting 31 and the hinge metal fitting 32 are connected so that rotation is possible by the rotating shaft 33B which comprises a connection means.

  The antenna element 4 is connected to the matching circuit 22 on the circuit board 21 arranged in the lower housing 2 by, for example, spring contact or soldering. The matching circuit 22 is connected to the radio circuit 23.

  The conductor element 5 is formed of a conductive sheet metal, particularly a thin conductor for weight reduction, and adheres to the inner wall surface of the lower casing 2 facing the notch 31A of the hinge bracket 31 in a close state. Placed with tape. In other words, the conductor element 5 is arranged close to the hinge fitting 31 and spaced apart from the hinge fitting 31 by a predetermined distance of about d1 = 1 mm, for example, as shown in FIG.

Next, the operation of the foldable portable wireless device configured as described above will be described.
An antenna current is fed to the antenna element 4 from the radio circuit 23 arranged on the circuit board 21 via the matching circuit 22 and operates as an antenna. However, since the hinge portion 3 is disposed in the vicinity of the feeding portion of the antenna 4, the antenna current may concentrate on the hinge portion 3. Further, since the cutout portion 31A of the hinge fitting 31 is present, the antenna current is concentrated on the cutout portion 31A. Therefore, in the present embodiment, the conductor element 5 is arranged so as to fill the notch 31A of the hinge metal 31.

Here, if the conductor element 5 does not exist, the notch portion of the hinge fitting 31 where the antenna current is concentrated, as shown in FIG. 5, the positional relationship between the folding portable wireless device and the human body in a talking state. Since the human body is close to 31A, the SAR is increased. In general, the current distribution and the local average SAR are correlated, and it is known that the local average SAR increases when the maximum point of current is concentrated in one place and the maximum point exists in the vicinity of the human body. Further, the presence of the notch 31A of the hinge fitting 31 reduces the Y-direction polarization component in FIG. 1, and reduces the vertical polarization (Z-direction component) in the call state shown in FIG. The antenna performance in the state deteriorates.
On the other hand, in the foldable portable wireless device according to the present embodiment, the conductor element 5 is disposed in the vicinity of the cutout portion 31A, so that the cutout portion 31A of the hinge metal fitting 31 operates in a high frequency manner. To do. Therefore, since the antenna current is not concentrated around the notch 31A of the hinge fitting 31, the local SAR in the vicinity of the notch 31A can be kept low. Further, since the polarization component in the Y direction in FIG. 1 is not reduced, high antenna performance can be ensured in a call state.

  In addition, you may comprise the conductor element 5 of this embodiment by vapor-depositing on the upper housing | casing 1. FIG. The conductor element 5 is disposed close to the hinge fitting 31 with a predetermined distance of about d1 = 1 mm and is connected to the hinge fitting 31 at a high frequency, but may be connected in a direct current manner. The conductor element 5 may have a plurality of sheet metals as long as it is arranged around the hinge portion 3. Moreover, in this embodiment, although the conductor element 5 was arrange | positioned on the X side wall surface in the lower housing | casing 2, -X side may be sufficient. The element shape of the antenna element 4 may be a monopole shape, a plate-like inverted F, a helical shape, or the like. Further, the antenna elements 4 provided in the lower housing 2 are connected to the matching circuit 22 on the circuit board 21 by spring connection or soldering to supply power, and are arranged in a row parallel to the longitudinal (Z) direction of the lower housing 2. You may arrange in.

[Second Embodiment]
Next, a folding portable wireless device according to a second embodiment of the present invention will be described with reference to FIGS. 6 and 7, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.
In the foldable portable wireless device according to this embodiment, the metal frame 11 is attached to the surface of the upper housing 1 on the + X side, that is, the surface on which the display unit generally composed of a large screen is arranged. Unlike the embodiment, the metal frame 11 also operates as an antenna element (upper antenna element). In addition, the length L1 of the long side of the metal frame 11 of this embodiment is about 90 mm. Also, in the folding portable wireless device of this embodiment, the hinge bracket 31 having the cutout portion 31A is provided in the hinge portion 3 as in the first embodiment, and this cutout portion 31A faces in the proximity state. A conductor element 5 is provided in the lower housing 2.

Similarly to the first embodiment, the hinge fitting 31 of the present embodiment also has a cutout portion 31A for weight reduction (for example, a width of about 10 mm in a direction orthogonal to the longitudinal direction of the casing (indicated by d1 in FIG. 8), The cutout portion 31A is filled with a part of the lower case 2 made of resin. Yes.
The hinge bracket 31 is mechanically fixed to the upper casing 1 by attaching the hinge bracket 31 to the upper casing 1 together with the metal frame 11 with the mounting screws 31B, as in the first embodiment. The metal frame 11 and the hinge fitting 31 are also electrically connected.

The hinge fitting 31 and the hinge fitting 32 are rotatably connected by a rotating shaft 33B that constitutes a connecting means. The hinge fitting 31, the hinge fitting 32, and the rotating shaft 33B are all made of conductive metal. Since they are formed, they are configured to conduct electrically at the contact points between them.
The hinge fitting 32 is attached to the lower housing 2 together with the power supply terminal 34 by means of mounting screws 34A, whereby the hinge fitting 32 and the power supply terminal 34 are electrically connected, and the hinge fitting 32 and the lower housing 2 are connected to each other. Is fixed mechanically.
The power supply terminal 34 is connected to the matching circuit 22 on the circuit board 21 disposed inside the lower housing 2 by, for example, spring contact or soldering. The circuit board 21 is a printed circuit board on which circuit components that realize various functions of the portable wireless device are mounted, and a ground pattern serving as a circuit ground potential is formed on almost the entire surface.

  As in the first embodiment, the conductor element 5 of the present embodiment is formed of a sheet metal, in particular, a thin one for weight reduction, and faces the notch 31A of the hinge metal fitting 31 in a close state, The casing 2 is disposed on the inner wall surface of the casing 2 by being attached with an adhesive tape. That is, also in this embodiment, the conductor element 5 is brought close to the hinge fitting 31 as in the first embodiment, and is separated from the hinge fitting 31 by a predetermined distance of about d1 = 1 mm, for example, as shown in FIG. Are arranged.

Next, the operation of the folding portable wireless device of this embodiment will be described.
The metal frame 11 and the hinge portion 3 operate as an upper antenna element having a length L2 (for example, 110 mm), and the matching circuit 22 matches the impedance of the upper antenna element to the input impedance (generally 50Ω) of the radio circuit 23. To do.
A ground pattern on the circuit board 21 having a length L3 (for example, 90 mm) also operates as an antenna element (lower antenna element). That is, the metal frame 11 and the hinge part 3 and the circuit board 21 operate as a dipole antenna, and high antenna performance can be secured in a state where the upper and lower casings 1 and 2 are opened.
Moreover, since the hinge part 3 is arrange | positioned in the vicinity of the electric power feeding part of an antenna, there exists a possibility that an antenna current may concentrate and distribute in the hinge part 3. FIG. Furthermore, since the notch 31A is present in the hinge fitting 31, the antenna current may be concentrated on the notch 31A. However, in this embodiment, the conductor element 5 is disposed so as to fill the notch of the hinge fitting.

Here, when the conductor element 5 is not present, as shown in the positional relationship between the folding portable wireless device and the human body (hand H and ear E) in the talking state in FIG. Since the notch 31A of 31 and the human body are close to each other, the SAR is increased as described above. Further, if the notch portion 1A is present in the hinge bracket 31, the polarization component in the Y direction in FIG. 6 is reduced, and the vertical polarization (Z direction component) in the call state shown in FIG. The antenna performance is reduced.
However, in the foldable portable wireless device of the present embodiment, since the conductor element 5 is disposed, the cutout portion 31A of the hinge fitting 31 operates so as to be buried at a high frequency. Therefore, since the antenna current is not concentrated around the notch 31A of the hinge fitting 31, the current distribution is made uniform and the local SAR can be lowered. In addition, since the polarization component in the Y direction in FIG. 6 is not reduced, high antenna performance can be ensured in a call state.

  The conductor element 5 may be deposited on the lower housing 2. Further, the conductor element 5 may be physically connected to the hinge fitting 31 and connected in a DC manner. Moreover, the conductor element 5 should just be arrange | positioned in the circumference | surroundings of the hinge part 3, and the sheet metal to comprise may be in multiple sheets, if it is a thin plate-shaped light thing. Furthermore, although the conductor element 5 is disposed on the X-side wall surface of the lower housing 2 in the present embodiment, it may be on the −X side. In the present embodiment, the antenna element (upper antenna element) in the upper housing 1 is configured by the metal frame 11, but the present invention is not limited to this. For example, a circuit disposed in the upper housing 1 A conductor such as a substrate pattern or a shield case may be used.

  The present invention is not limited to the embodiment described above, and can be implemented in various forms without departing from the gist of the present invention.

  The foldable portable radio apparatus of the present invention can reduce local SAR as well as light weight, and can improve call quality because high antenna performance can be obtained in a call state. This is useful for improving the wireless communication performance.

1A and 1B show a basic configuration when the folding portable wireless device according to the first embodiment of the present invention is opened, (A) is a plan view, and (B) is a side view. Schematic perspective view showing the main part of the folding portable radio The principal part enlarged view which shows the hinge part vicinity of the foldable portable radio | wireless machine Explanatory drawing showing the call state of the foldable portable radio Explanatory drawing which shows the positional relationship between the foldable portable wireless device and the human body in a call state It shows a basic configuration when the folding portable wireless device according to the second embodiment of the present invention is opened, (A) is a plan view, (B) is a side view. Schematic perspective view showing the main part of the folding portable radio The principal part enlarged view which shows the hinge part vicinity of the foldable portable radio | wireless machine

Explanation of symbols

1 Upper housing (first housing)
11 Metal frame (upper antenna element)
2 Lower housing (second housing)
21 Circuit board (lower antenna element)
22 Matching circuit 23 Radio circuit 3 Hinge part 31 Hinge fitting (conductive metal)
31A Notch 32 Hinge bracket 33A, 33B Rotating shaft 34 Feeding terminal 4 Antenna element (antenna element)
5 Conductor elements

Claims (4)

A first housing;
A second housing;
A hinge portion that rotatably connects the first housing and the second housing;
An antenna element,
A foldable portable radio apparatus in which a conductive metal having a notch is provided in a part of the hinge, and a conductor element that disperses an antenna current distributed in the conductive metal is disposed in the notch. A first housing;
A second housing;
A hinge portion that rotatably connects the first housing and the second housing;
An antenna element provided in the first housing;
A circuit board having a ground pattern provided in the second housing;
A power supply unit connected to a radio circuit on the circuit board;
The hinge part is formed of a conductive metal and electrically connects the first hinge part and the second hinge part with the first hinge part and the second hinge part and supports the hinge part rotatably. And
The first hinge portion is provided in the first housing and is electrically connected to an end portion of the antenna element on the hinge portion side,
The second hinge part is provided in the second casing, and is arranged at a predetermined interval from a ground pattern on the circuit board, and is electrically connected to the power feeding part,
A foldable portable radio apparatus in which a conductive metal having a notch is provided in a part of the hinge, and a conductor element that disperses an antenna current distributed in the conductive metal is disposed in the notch.   The folding portable wireless device according to claim 1 or 2, wherein the conductor element is electrically connected to a conductor portion of the hinge portion.   The foldable portable wireless device according to claim 1 or 2, wherein the conductor element is disposed close to the conductor portion of the hinge portion at a predetermined interval.

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