JP4642588B2 - Portable wireless device - Google Patents

Description

  The present invention relates to a foldable portable wireless device, and in particular, a two-axis hinge rotating structure (hereinafter referred to as a “rotating two-axis hinge structure”) capable of closing a housing in two states (modes). The present invention relates to a portable wireless device having the same.

The antenna characteristics vary greatly depending on the state near the antenna, and the antenna performance may be significantly degraded. Factors that greatly affect the performance of this antenna are mainly:
1. The effects of human proximity,
2. Influence of metal proximity,
3. There are three effects due to changes in the structure state of the portable radio apparatus. How to reduce these influences is an important issue in designing an antenna in the portable radio apparatus.

  By the way, in recent years, the number of foldable mobile phones having a rotating biaxial hinge structure has increased. Unlike a conventional folding mobile phone with an open / close 1-axis hinge structure, the case can be closed in two different states. However, it is difficult to ensure uniform antenna performance in a good state when the housing is in either of these two closed states.

  For example, a casing having an input unit (hereinafter referred to as a first casing) and a casing having a display unit (hereinafter referred to as a second casing) are connected with a rotating biaxial hinge structure, and the hinge of the first casing is connected. In a foldable mobile phone in which an antenna is disposed on the short side (end) side opposite to the provided short side (end), when the first and second cases are closed, the antenna in the first case And a conductive part (hereinafter referred to as “conductive part”) present in the second housing may overlap (or be close to) each other in position. However, when this conductive component overlaps the open end side of the antenna, the overlapped conductive component becomes a resistance element for radio waves radiated from the antenna, and deteriorates the antenna performance.

This will be specifically described with reference to FIG.
FIG. 8 is a configuration diagram of an antenna unit in a foldable mobile phone having a conventional rotating biaxial hinge structure. Of these, FIG. 8A shows the case where the first and second housings 101 and 102 are closed while the display portion 102A of the second housing 102 is turned upside down, and FIG. The case where the 1st, 2nd housing | casing 101,102 is closed in the state which becomes a back is shown. FIG. 9 shows actual measurement values of the VSWR (Voltage Standing Wave Ratio) characteristics of the antenna unit in FIGS. 8 (A) and 8 (B).
In FIG. 8A, since the conductive component 102B exists on the power feeding unit 102D side, the conductive component 102B does not have a radiation resistance of the radio wave radiated from the antenna unit 102C, as shown in FIG. 9A. Furthermore, it has a good antenna characteristic of VSWR2 or less at a frequency of 885 MHz.
On the other hand, in FIG. 8B, since the conductive component 102B exists on the open end side, the conductive component 102B becomes a radiation resistance of the radio wave radiated from the antenna portion 102C. Therefore, as indicated by the point P marked in FIG. 9B, the VSWR becomes 5 at the frequency of 885 MHz, and the free space efficiency is deteriorated by 2 dB.

  By the way, in the case of a foldable mobile phone connected by a conventional open / close single-shaft hinge structure, the conductive parts may be arranged so as not to overlap the open end side of the antenna. However, as described above, in the rotating biaxial hinge structure, the housing can be turned, and there are two types of states when the housing is closed as described above. In addition, the conductive component may overlap the open end side of the antenna, and in this case, the antenna performance deteriorates.

Therefore, the following two solutions are mainly known for the above problem. One is a method of switching the matching circuit of the antenna in accordance with a change in the state of the portable wireless device, and the other is a method of switching the antenna itself to be used in accordance with the change in the state of the portable wireless device.
In the former method, for example, as shown in Patent Document 1, it is detected whether the casing of the folding mobile phone is in an open state or a closed state, and an antenna matching circuit is selected according to the state. . In the latter method, for example, as shown in Patent Document 2, the antenna itself is switched between a case where the antenna is used while being held by a human body and a case where the antenna is connected to a PC or the like and used for data communication.
JP 2002-271462 A JP 2000-22609 A

However, the switching of the matching circuit described above is a configuration in which the matching circuit is switched to an optimum matching circuit when the housing is in an open state and a closed state, and there are two types of closing such as a rotating biaxial hinge structure. It has not been taken into account for the situation. That is, in the above configuration, the antenna characteristics can be prevented from deteriorating due to matching loss, but there is no effect on the absolute antenna characteristics degrading due to a physical state change such as the proximity of a metal object near the antenna.
On the other hand, since the configuration in which the antenna itself is switched requires a plurality of antennas, there is a problem that the mounting area is increased and the cost is increased.

  The present invention has been made in view of the above circumstances, and has a rotating biaxial hinge structure capable of closing a housing in two different states, and without using a plurality of antennas, the housing is in any state. An object of the present invention is to provide a portable wireless device that can maintain good antenna performance even when the body is closed and can make the antenna performance uniform.

A portable wireless device according to the present invention includes a first housing, a second housing, and a hinge that connects the first housing and the second housing so as to be rotatable about different two-direction axes. A portion of the first housing that is closer to the end opposite to the end on which the hinge portion is provided; a circuit board provided in the first housing; Two power feeding means that are arranged apart from each other and feed power to the antenna element of the antenna unit, a radio unit provided on a circuit board of the first housing, the two power feeding units, and the radio unit Provided between the first switch means for switching the connection between one of the two power supply means and the radio unit, and the end opposite to the end of the second housing provided with the hinge part Conductive parts provided close to the part and detecting means for detecting a closing direction of the first casing with respect to the second casing Wherein the first switching means, electric in response to the closing direction detected by said detecting means, and power supply means closer to the component having the conductive one of the two power supply means, and said radio unit Are connected to each other. With the above configuration, the closed position of the housing can be detected, and the feeding position of the antenna can be switched so that the metal-containing component does not overlap the open end of the antenna. The component that is provided becomes a resistance element for radio waves radiated from the antenna, and it is possible to prevent a state in which the antenna characteristics are deteriorated.

Preferably, the first casing, the second casing, the hinge section that connects the first casing and the second casing so as to be rotatable about different two-direction axes, and An antenna part provided near the end of the second casing opposite to the end provided with the hinge part, a circuit board provided inside the first casing, and the second casing Arranged at a distance from each other, two power feeding means for feeding power to the antenna element of the antenna section, a radio section provided on a circuit board of the first casing, and a hinge section of the first casing A conductive part provided near the end opposite to the end side, and provided between the two power feeding means and the radio part, and between one of the two power feeding means and the radio part First switch means for switching connection and detection means for detecting a closing direction of the first casing relative to the second casing. The first switching means, in response to the closing direction detected by said detecting means, towards a feeding means near the part having the conductive one of the two power supply means, electrically said radio unit Shall be connected.

  Preferably, the power supply means or a second switch means for connecting a signal line on the circuit board for connecting the power supply means and the first switch means to a ground of the circuit board, The two-switch means is a circuit board that connects the power supply means that is not supplied with power, or the power supply means that is not supplied with power to the first switch means, in accordance with a signal from the detection means. The upper signal line is connected to the ground of the circuit board by a lumped constant. With the above configuration, it is possible to reduce the influence of the circuit board pattern that connects the power feeding means and the switch means.

  Preferably, a third switch means for electrically connecting and disconnecting the power supply means and the first switch means is provided on a signal line on the circuit board to which the first switch means is connected, and the third switch means is provided. According to a signal from the detection means, the switch means electrically disconnects the power supply means that is not supplied from the two power supply means and the first switch means. With the above configuration, it is possible to reduce the influence of the circuit board pattern that connects the power feeding means and the switch means.

  According to the present invention, a rotating two-axis hinge structure capable of closing the casing in two types of states does not require a plurality of antennas, and the antenna performance is improved regardless of the state of the casing being closed. It is possible to provide a portable wireless device that can maintain good and uniform antenna performance.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[First Embodiment]
FIG. 1 is a perspective view showing an external configuration of a portable radio apparatus according to the first embodiment of the present invention. In the present embodiment, a foldable mobile phone 1 having a rotating biaxial hinge structure will be described as an example of a mobile wireless device.
As shown in FIG. 1, the foldable mobile phone 1 according to the present embodiment includes a first housing 2 that is a lower housing, a second housing 3 that is an upper housing, The second casing 3 includes a first hinge portion 4 that is connected to the casing surface so as to be pivotable and openable / closable. As a result, the first and second casings 2 and 3 are connected to the hinge portion 4 so as to be rotatable about two different directions of axes, so-called rotating two-axis type (rotating two-axis hinge structure). Is configured.

The first housing 2 is provided with an operation unit 21 provided with various operation keys such as numeric keys, character keys, or function keys, a transmission microphone unit 22 for inputting a call voice, and the like.
The second housing 3 outputs a call voice and a display unit 31 for displaying various information such as the operating state and communication destination information of the foldable mobile phone 1 or acquisition information such as e-mail texts and images. A receiver unit 32 for receiving a voice is provided.
Although not shown, the first housing 2 and the second housing 3 may be provided with a speaker unit that outputs a ring tone, a camera unit that captures an image, a connector unit that is connected to an external device, and the like. is there.

Next, electrical components related to the antenna of the folding mobile phone 1 according to the present embodiment will be described with reference to FIG.
The first housing 2 is formed of an appropriate resin material, and as shown in FIG. 2, a circuit board 23 on which various circuits are mounted is disposed. The circuit board 23 is provided with a wireless unit 24 and the like.
In the first housing 2, a conductive part (hereinafter referred to as “conductive part”) 25 is on the side opposite to one short side (end part) side on which the hinge part 4 is provided. Are provided on the short side (end) side of the circuit board 23 and connected to the circuit board 23. In addition, as this electroconductive component 25, it is a camera etc., for example.
The first housing 2 may be formed of a metal material such as magnesium or a material containing a metal.

The second housing 3 is formed of an appropriate resin material. As shown in FIG. 2, a circuit board 33 is disposed inside the second housing 3 and the end of the second housing 3 closer to the hinge portion 4. The antenna part 34 is provided on the short side (end part) side opposite to. The antenna unit 34 is connected to the radio unit 24 mounted on the circuit board 23 in the first housing 2 by the coaxial cable 7 via the matching circuit 35 and the switching circuit 36.
The matching circuit 35 is mounted on the circuit board 33 and performs impedance matching or the like for matching the resonance frequency of the antenna unit 34. The switching circuit 36 is mounted on the circuit board 33 and constitutes the first switch means, and is configured to switch the feeding position of the antenna.
In addition, you may form this 2nd housing | casing 3 with a metal material.

  In addition, at least the hinge mechanism main body of the hinge part 4 is formed of a metal material such as magnesium or a material containing metal.

Next, a peripheral configuration of the antenna unit 34 in the foldable mobile phone 1 according to the present embodiment will be described with reference to FIG.
As shown in FIG. 3, the antenna unit 34 is connected to one end of the matching circuit 35. On the other hand, the other end of the matching circuit 35 is connected to the switching circuit 36. The switching circuit 36 is connected to the detection unit 5 and the radio unit 24 that are detection means for detecting the open / closed state of the first housing 2 and the second housing 3. The wireless unit 24 and the matching circuit 35 may be appropriately configured according to the frequency band to be used, the communication method, and the like.

Next, the configuration of the detection unit 5 will be described with reference to FIG. 4A shows a state in which the first and second housings 2 and 3 are closed so that the display unit 31 in the second housing 3 is turned up, and FIG. 4B shows the display unit 31 on the back. As shown, the first and second housings 2 and 3 are closed.
For example, as illustrated in FIG. 4, the detection unit 5 includes a magnet 51 disposed in the first housing 2, a first magnetic detection element 52 </ b> A such as a Hall IC disposed in the second housing 3, and the second. It is comprised with the magnetic detection element 52B. A reed switch may be used for the first and second magnetic detection elements 52A and 52B. Moreover, as long as it is an element in which magnetic detection is possible, you may comprise suitably using other things.

As shown in FIG. 4A, when the first and second housings 2 and 3 are closed so that the display unit 31 in the second housing 3 is turned upside down (this is referred to as “the housing in the reverse state”). This is referred to as “closing the body”), and the magnet 51 in the first housing 2 and the first magnetic detection element 52A in the second housing 3 are close to each other, and the closing of the housing in the reverse state is detected. The conductive component 25 in the first housing 2 is disposed on the same side as the magnet 51 in the first housing 2, and is disposed on the left side in FIG.
On the other hand, as shown in FIG. 4B, when the first and second housings 2 and 3 are closed so that the display unit 31 in the second housing 3 is on the back (this is referred to as “normal state”). The magnet 51 in the first housing 2 and the second magnetic detection element 52B in the second housing 3 are close to each other, and the closing of the housing in a normal state is detected. Note that in the case of “closing the casing in the normal state”, the conductive component 25 in the first casing 2 has a relative positional relationship with respect to the second casing 3 described above. This is the opposite of “closed”.

  Therefore, with the above configuration, when outputting the detection signal from the first magnetic detection element 52A, closing the casing in the reverse state, and when outputting the detection signal from the second magnetic detection element 52B, Since it can be detected that the casing is closed in the normal state, it is possible to switch the feeding point described later in correspondence with the position of the conductive component 25 in the first casing 2.

Next, a schematic configuration of the antenna unit 34 and the switching circuit 36 in the foldable mobile phone 1 of the present embodiment will be described with reference to FIG.
The antenna unit 34 is constituted by a monopole antenna, for example, as shown in FIG. The monopole antenna (antenna element) has a first feeding point 34A disposed at one end and a second feeding point 34B disposed at the other end. On the other hand, the switching circuit 36 has a switch structure connected to either the first feeding point 34A or the second feeding point 34B of the monopole antenna.
The switching circuit 36 and the first feeding point 34A and the second feeding point 34B of the monopole antenna are connected to the circuit board signal line 36A and the matching circuit 35A, and the circuit board signal line 36B and the matching circuit 35B, respectively. Electrically connected. On the other hand, the switching circuit 36 and the wireless unit 24 are also electrically connected by the coaxial cable 7.

  Therefore, by configuring as described above, by connecting either the left or right feeding point 34A, 34B close to the conductive component 25 in the second housing 3 based on the detection result of the detection unit 5, the conductive It is possible to prevent the radiative component 25 from becoming a radiation resistance of the radio wave radiated from the antenna portion 34, and to greatly improve the antenna characteristics.

[Second Embodiment]
Next, a foldable mobile phone according to a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals to avoid redundant description.
FIG. 6 is a schematic configuration diagram illustrating a connection state between the antenna unit 34 and the switching circuit 36 of the present embodiment. The antenna unit 34, the switching circuit 36, and the radio unit 24 of the present embodiment have the same configuration as that of the first embodiment.

Further, in the present embodiment, the gap between the switching circuit 36 and the first feeding point 34A of the antenna unit 34 (monopole antenna) and the gap between the switching circuit 36 and the second feeding point 34B are the same as those in the first embodiment. Similarly, the circuit board signal line 36A is electrically connected to the matching circuit 35A, and the circuit board signal line 36B is electrically connected to the matching circuit 35B. Unlike the first embodiment, the circuit board signal line 36A is electrically connected. On the circuit board signal line 36B, lumped constants 37A and 37B and termination circuits 38A and 38B as second switch means are connected.
Here, the lumped constant refers to a resistor, a capacitor, and a coil, and the lumped constants 37A and 37B are for adjusting the amount of coupling between the ground of the circuit board 33 and the circuit board signal lines 36A and 36B. The circuits 38A and 38B remove the influence of the signal lines by adjusting the amount of coupling that connects the lumped constants 37A and 37B to the ground of the circuit board 33.

Therefore, based on the detection result of the detection unit (not shown), either the left or right feeding point is connected to the same side as the side where the conductive component 25 exists in the first housing 2. At the same time, the termination circuit connected on the circuit board signal line on the power feeding point side that is not connected operates, and the lumped constant is connected to the ground of the circuit board 33.
For example, in the state shown in FIG. 6, the left or right feeding point where the conductive component 25 overlaps (or is close to), that is, in this case, the first feeding point 34A is connected. At this time, the connected termination circuit 38A on the first feeding point 34A side does not operate, and the lumped constant 37A and the ground of the circuit board 33 become non-conductive.
At the same time, the termination circuit 38B connected to the circuit board signal line 36B on the second feeding point 34B side that is not connected operates, and the lumped constant 37B is connected to the ground of the circuit board 33. By connecting the lumped constant 37B to the ground of the circuit board 33, the influence of the circuit board signal line 36A on the feeding point side that is not connected is reduced.
Therefore, according to the present embodiment, it is possible to prevent the conductive component 25 from becoming a radiation resistance of the radio wave radiated from the antenna unit 34 and to greatly improve the antenna characteristics.

[Third Embodiment]
Next, a foldable mobile phone according to a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals to avoid redundant description.
FIG. 7 is a schematic configuration diagram illustrating a connection state between the antenna unit 34 and the switching circuit 36 in the foldable mobile phone according to the present embodiment. Also in this embodiment, the antenna unit 34, the switching circuit 36, and the wireless unit 24 have the same configuration as that of the first embodiment. In the present embodiment, a circuit board is provided between the switching circuit 36 and the first feeding point 34A and the second feeding point 34B of the antenna unit 34 (monopole antenna), as in the first embodiment. The signal line 36A and the matching circuit 35A, and the circuit board signal line 36B and the matching circuit 35B are electrically connected. Unlike the first embodiment, the circuit board signal line 36A and the circuit board signal line 36B are connected. Above, a conduction control circuit 6A and a conduction control circuit 6B, which are third switch means, are connected.

Therefore, based on the detection result of the detection unit (not shown), the conduction control circuit on the side overlapping (or close to) the conductive component 25 in the first housing 2 operates, and the switching circuit and the feeding point are connected. At the same time, the conduction control circuit connected on the circuit board signal line on the power supply point side that is not connected operates, and the power supply point that is not connected and the switching circuit are made nonconductive.
For example, in the state shown in FIG. 7, the conduction control circuit 6 </ b> A on the side overlapping (or close to) the conductive component 25 in the first housing 2 operates, and the wireless unit 24 and the first unit are connected via the switching circuit 36. The power supply point 34A is electrically connected. At the same time, the conduction control circuit 6B connected to the circuit board signal line 36B on the second feeding point 34B side that is not connected operates, and the connection between the second feeding point 34B that is not connected and the switching circuit 36, That is, the second power feeding point 34 </ b> B and the wireless unit 24 are not connected. Thus, by making the conduction control circuit that is not supplied with power non-conductive, the influence of the circuit board signal line on the power supply point side that is not connected can be reduced.
Therefore, according to this embodiment, it is possible to prevent the conductive component 34 from becoming a radiation resistance of the radio wave radiated from the antenna unit 24, and to greatly improve the antenna characteristics.

  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 portable wireless device of the present invention is a foldable portable wireless device having a rotating biaxial hinge structure, and does not require a plurality of antennas, so that the antenna performance is good in any of the two closed states. Since it can be held and the antenna performance can be made uniform, it is useful as a portable wireless device that is small and has high performance.

1 is a schematic perspective view showing an external appearance of a foldable mobile phone according to a first embodiment of the present invention. Schematic configuration diagram showing the main part of the foldable mobile phone from the side The block diagram which shows schematic structure of the antenna part periphery of the foldable mobile phone The schematic block diagram of the detection part of the foldable mobile phone is shown, and (A) shows a conductive part on the right side of the case when (B) shows a conductive part on the left side of the case. Is placed Block diagram showing the configuration of the antenna unit and switching circuit of the folding cellular phone The block diagram which shows the structure of the antenna part and switching circuit of a foldable mobile telephone which concern on the 2nd Embodiment of this invention. The block diagram which shows the structure of the antenna part and switching circuit of a foldable mobile telephone concerning the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the principal part containing the antenna part of the conventional folding-type mobile telephone, (A) is a conductive part arrange | positioning at the electric power feeding part side, (B) is the electric power feeding part side. When conductive parts are placed on the opposite side The VSWR characteristic of the antenna part of the conventional foldable mobile phone is shown. (A) is a VSWR characteristic diagram when conductive parts are arranged on the power feeding part side, and (B) is the power feeding part side. VSWR characteristics when conductive parts are placed on the opposite side

Explanation of symbols

1 Folding mobile phone (mobile wireless device)
2 1st housing | casing 21 Operation part 22 Microphone part 24 Radio | wireless part 25 Conductive component (camera)
DESCRIPTION OF SYMBOLS 3 2nd housing | casing 31 Display part 32 Receiver part 33 for reception 33 Circuit board 34 Antenna part 34A 1st feed point 34B 2nd feed point 35 Matching circuit 35A Matching circuit 35B Matching circuit 36 Switching circuit (1st switch means)
36A Circuit board signal line 36B Circuit board signal line 37A, 37B Lumped constant 38A, 38B Termination circuit (second switch means)
4 hinge part 5 detection part 51 magnet 52A 1st magnetic detection element (Hall IC etc.)
52B 2nd magnetic detection element (Hall IC etc.)
6A, 6B conduction control circuit (third switch means)
7 Coaxial cable

Claims (4)

A first housing;
A second housing;
A hinge portion that connects the first housing and the second housing so as to be rotatable about different two-direction axes;
An antenna part provided near the end of the first casing opposite to the end provided with the hinge part;
A circuit board provided in the first housing;
Two feeding means that are spaced apart from each other in the first housing and feed power to the antenna element of the antenna unit;
A wireless unit provided on a circuit board of the first housing;
A first switch that is provided between the two power feeding means and the wireless unit, and switches a connection between one of the two power feeding means and the wireless unit;
A conductive part provided near the end opposite to the end provided with the hinge portion of the second housing;
Detecting means for detecting a closing direction of the first casing with respect to the second casing;
The first switch means electrically connects the power supply means closer to the conductive part of the two power supply means and the radio unit according to the closing direction detected by the detection means. Foldable portable wireless device. A first housing;
A second housing;
A hinge portion that connects the first housing and the second housing so as to be rotatable about different two-direction axes;
An antenna part provided near the end of the second casing opposite to the end provided with the hinge part;
A circuit board provided in the first housing;
Two power feeding means that are spaced apart from each other in the second housing and feed power to the antenna element of the antenna unit;
A wireless unit provided on a circuit board of the first housing;
A conductive part provided near the end opposite to the end provided in the hinge part of the first housing;
A first switch that is provided between the two power feeding means and the wireless unit, and switches a connection between one of the two power feeding means and the wireless unit;
Detecting means for detecting a closing direction of the first casing with respect to the second casing;
The first switch means electrically connects the power supply means closer to the conductive part of the two power supply means and the radio unit according to the closing direction detected by the detection means. Foldable portable wireless device. The power supply means, or a second switch means for connecting a signal line on the circuit board connecting the power supply means and the first switch means to the ground of the circuit board,
The second switch means connects the power supply means that is not supplied with power among the two power supply means, or connects the power supply means that is not supplied with power to the first switch means, in accordance with a signal from the detection means. The portable radio apparatus according to claim 1 or 2 , wherein a signal line on the circuit board is connected to a ground of the circuit board by a lumped constant. A third switch means for electrically connecting and disconnecting the power supply means and the first switch means on a signal line on the circuit board for connecting the first switch means;
The third switch means electrically disconnects between the first power supply means and the first power supply means, which is not supplied with power, of the two power supply means, in response to a signal from the detection means. The portable wireless device according to any one of 1 to 3 .

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