JP2011223368A - Mobile terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biaxially-foldable mobile terminal with high antenna performance.SOLUTION: A mobile terminal 10 comprises: a first hinge part 14 to hinge a first housing 11 and a second housing 12 together in an openable/closable manner; a second hinge part 15 to hinge the second housing 12 and a third housing 13 together in a rotatable manner; a display unit 20 arranged in the third housing 13; a first radio system unit 16; a second radio system unit 17 having an operation frequency at least part of which is identical to that of the first radio system unit 16; a first antenna element 18 for the first radio system unit 16 arranged on one end in the width direction which is on the side facing the first hinge part 14 side in the first housing 11; and a second antenna element 19 for the second radio system unit 17 arranged on the same side in the width direction as the end on which the first antenna element 18 is disposed, which is located on the side facing the second hinge part 15 side in the third housing 13 when the mobile terminal 10 is in the closed state where the display unit 20 is not positioned outside the mobile terminal 10.

Description

  The present invention relates to a portable terminal having two rotation axes.

  In recent years, mobile phones have become widespread in various structures that allow a user to select a housing state according to a usage such as a folding type. Among them, there is a “case closed state” in which the display screen is not on the surface of the case in the standby state, an “open state” in which two cases are opened in the call state, and a display screen that is displayed even though the case is closed. There is a rotating biaxial structure (swivel structure) that can be in three states, the “viewer closed state” on the surface of the housing.

  In addition to a cellular communication radio system used for voice calls and the like, a mobile phone is equipped with a plurality of radio systems. Among these wireless systems, a plurality of wireless systems that operate at the same frequency may be mounted on the same mobile phone. As an example, there are wireless systems such as Bluetooth and Wi-Fi that use both frequencies of 2.400 to 2.4835 GHz, although they are different wireless systems. When two such wireless systems are configured in the same casing, there are many cases in which antenna performance deterioration due to the influence of electromagnetic coupling becomes a problem because there are two antennas operating at the same frequency in a small casing.

There are the following patent documents as techniques for ensuring the antenna performance of a portable terminal having a swivel structure.
In Patent Document 1, in order to maintain constant antenna performance in both the case closed state and the viewer closed state, balanced antenna elements are provided so as not to be close to the case on the side where no antenna elements are arranged. In the thickness direction of the casing, one is always kept at a distance. However, this document does not mention performance degradation due to electromagnetic coupling of antenna elements operating simultaneously at the same frequency.

  In Patent Document 2, in order to maintain a constant antenna performance in both the case closed state and the viewer closed state, both antenna elements cause deterioration in antenna performance in the case where the antenna element is not disposed. In order to reduce the influence of metal objects, the antenna element can be fed from both sides, and the feeding position is selected according to the state of the casing. However, this document does not mention performance degradation due to electromagnetic coupling of antenna elements operating simultaneously at the same frequency.

JP 2007-19808 A JP 2007-49215 A

  However, since these antenna devices of Patent Documents 1 and 2 do not consider mounting a plurality of antennas corresponding to a plurality of radio devices having the same operating frequency, a plurality of antennas are arranged in the same casing. There is no mention of antenna performance degradation due to electromagnetic coupling.

  Also, considering the usage scenes of various wireless systems, the priority order of antenna elements that need to maintain high performance depending on the housing state is not set, and it is really necessary to obtain constant performance in any state. In such a state, there is a problem that high antenna performance is not obtained.

  The present invention has been made to solve the above-described problems, and is arranged such that the antenna element for a wireless system that is frequently used in a closed viewer state is separated from the antenna element that operates at the same frequency as the antenna element. And it aims at providing the portable terminal which can ensure high antenna performance in a required use condition.

The portable terminal of the present invention includes a first casing, a second casing, a third casing, a first hinge portion that connects the first casing and the second casing so as to be openable and closable, A second hinge portion rotatably connecting the second housing and the third housing; a first circuit board disposed in the first housing; and a second circuit disposed in the third housing. A substrate; a display unit disposed in the third housing; a first wireless system unit disposed in the first housing or the third housing; and the first housing or the third housing. A first antenna that is disposed in the first housing and is electrically connected to the first radio system unit, at least a part of the operating frequency being the same as the first radio system unit. An element and a second antenna element disposed in the third housing and electrically connected to the second wireless system unit; The distance between the first antenna element and the second antenna element when the display unit is disposed outside and closed is equal to the distance between the first antenna element when the display unit is disposed inside and closed. It is characterized by being larger than the distance to the second antenna element.

  INDUSTRIAL APPLICABILITY The present invention can provide a portable radio that can realize high antenna performance of a radio system that is prioritized in each of a case closed state and a viewer closed state.

The schematic perspective view which shows the three states of the portable terminal 10 of this invention. 1 is a front view of a portable terminal according to a first embodiment of the present invention, a side view thereof, a cross-sectional view of an antenna element portion in a closed state of a casing, and a cross-sectional view of an antenna element portion in a closed state of a viewer; Open state front view, side view, cross-sectional view of antenna element portion in closed state, cross-sectional view of antenna element portion in closed viewer state of portable terminal according to second embodiment of the present invention Open state front view, side view, cross-sectional view of antenna element part in case of closed casing, cross-sectional view of antenna element part in the state of closed viewer according to the third embodiment of the present invention

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing a state of the entire casing of the mobile terminal according to the embodiment of the present invention. 1A is a diagram illustrating a closed state of the case where the portable terminal is closed, such as during standby, FIG. 1B is a diagram illustrating an open state, such as during a call, and FIG. It is a figure which shows the viewer closed state of the closed state where the screen is not in a table | surface at the time of viewing.
(First embodiment)
FIG. 2A is a front view of the entire structure of the opened mobile terminal 10 according to the embodiment of the present invention as viewed from the + Z direction. FIG. 2B is a side view seen from the −Y direction, and FIG. 2C is a cross-sectional view of the antenna element portion in a closed state of the housing. FIG. 2D is a cross-sectional view of the antenna element portion when the viewer is closed and the viewer is closed.

  As shown in FIG. 2A, the mobile terminal 10 includes a first casing 11, a second casing 12, a third casing 13, a first hinge section 14, a second hinge section 15, and a first wireless system section. 16, a second wireless system unit 17, a first antenna element 18, a second antenna element 19, a display unit 20, a first circuit board 21 and a second circuit board 22.

  The first antenna element 18 and the first wireless system unit 16 are an Bluetooth antenna and a wireless system, respectively. The first radio system unit 16 transmits or receives a signal via the first antenna element 18. The second antenna element 19 and the second wireless system unit 17 are a Wi-Fi antenna and a Wi-Fi wireless system, respectively. The first radio system unit 17 transmits or receives signals via the first antenna element 19.

  The first hinge 14 is a support shaft member that allows the first housing 11 and the second housing 12 to rotate, and the second hinge 15 allows the second housing 12 and the third housing 13 to rotate. This is a support shaft member. By arranging these two hinges orthogonally, the mobile phone can have two orthogonal rotation axes.

  The first casing 11 and the second casing 12 are connected to each other by a first hinge part 14 so as to be freely opened and closed, and the second casing 12 and the third casing 13 are rotatably connected to each other by a second hinge part 15. . A first circuit board 21 is disposed on the first housing 11, and a second circuit board 22 is disposed on the third housing 13. The first radio system unit 16 is disposed on the first circuit board 21, and the second radio system unit 17 is disposed on the second circuit board 22. The first antenna element 18 is disposed at one end in the width direction and on the side facing the first hinge portion 14 in the first housing 11, and is electrically connected to the first radio system portion 16. The second antenna element 19 is disposed at one end in the width direction and on the side facing the second hinge portion 15 in the third housing 13 and is electrically connected to the second radio system portion 17. . Further, the first antenna element 18 and the second antenna element 19 are arranged such that their distance is larger in the viewer closed state than in the case closed state. The operating frequencies of the first wireless system unit 16 and the second wireless system unit 17 are at least partially the same.

In general, when antennas are close to each other, antenna performance deteriorates due to electromagnetic coupling effects. In addition, when the operating frequencies are the same and when the operating frequencies are not the same, the antenna performance is further degraded.
In this configuration, Bluetooth and Wi-Fi are installed, but it is assumed that the frequency of use of Wi-Fi and Bluetooth is high when the viewer is closed. For this reason, it is necessary to give priority to antenna performance when the viewer is closed.

  In this configuration, since the distance between the antennas is increased when the viewer is closed with respect to the closed state of the housing, the influence of electromagnetic coupling between the antennas can be reduced. For this reason, the antenna performance of the antenna element required in the viewer closed state can be kept high. Thereby, when the viewer is closed, the antenna performance of the first antenna element 17 for Bluetooth and the second antenna element 18 of the Wi-Fi antenna can be kept high.

FIG. 2C and FIG. 2D are cross-sectional views of the antenna element viewed from the −X direction when the housing is closed and the viewer is closed, respectively. In these figures, the distance between the first antenna element 18 and the second antenna element 19 is small when the casing is closed, whereas the distance between the first antenna element 17 and the second antenna element 18 is small when the viewer is closed. large. For this reason, the antenna performance deteriorates because the influence of electromagnetic coupling is large when the casing is closed. However, the influence of electromagnetic coupling can be reduced when the viewer is closed, and the viewer is in the closed state compared to the first antenna element 18 and the second antenna. The antenna performance of the element 19 can be kept high.
The arrangement position of the first antenna element is not limited to one end on the side facing the first hinge part 14 and in the width direction, and can be arranged at any position on the first circuit board. .
In such a case, the viewer is placed so that the distance in the viewer closed state is larger than the distance between the first antenna element and the second antenna element in the closed state.
(Second Embodiment)
First, the configuration of the mobile terminal 30 according to the second embodiment will be described. Note that, of the configuration of the mobile terminal 30 according to the present embodiment, the configuration similar to the configuration of the mobile terminal 10 according to the first embodiment is the same as the mobile terminal 10 according to the first embodiment (FIG. 2). The same reference numerals as those in FIG.

  As shown in FIG. 3A, the mobile terminal 30 according to the present embodiment includes a high-frequency switching unit 31, a reactance element 32, a wireless system detection unit 33, and an open / close detection unit 34 disposed in the second circuit board 22. The configuration differs from that of the mobile terminal 10.

  With this configuration, the portable terminal 30 detects the closed state by the open / close detection unit 34 and the electrical operation of the first radio system unit 16 or the first antenna element 18 by the radio system detection unit 33, thereby reactance. The element 32 can be connected to the second wireless system unit 17 via the high frequency switching means 31. Thereby, the impedance matching of the 2nd antenna element 19 is changed, the electromagnetic coupling of the 1st antenna element 18 and the 2nd antenna element 19 is reduced, and degradation of the antenna performance of the 1st antenna element can be prevented.

The reactance element 32 is electrically connected to the first radio system unit 16 via the high frequency switching unit 31 and the radio system detection unit 33 is connected to the second radio system unit 17 so that the antenna of the second antenna element is connected. It can also prevent performance degradation. Further, the open / close detection means 34 does not have to be disposed on the first circuit board, and may be disposed at any location of the housing.
(Third embodiment)
First, the configuration of the mobile terminal 40 according to the third embodiment will be described.

  Of the configuration of the mobile terminal 40 according to the present embodiment, the same configuration as the configuration of the mobile terminal 30 according to the second embodiment is the same as that of the mobile terminal 30 according to the second embodiment (FIG. 3). The same reference numerals as those in FIG.

  As shown in FIG. 4, the mobile terminal 40 according to the present embodiment includes a third wireless system unit 41 and a third antenna element 42 arranged in the first circuit board 21, and the configuration of the mobile terminal 30 is different from that of the mobile terminal 30. Different.

  With this configuration, in the mobile terminal 40 in which the antenna for the cellular system is mounted around the hinge portion, the distance between the antenna elements for the plurality of antenna systems other than the cellular system and the antenna element for the cellular system can be increased. The performance of a plurality of antennas for wireless communication other than the above can be improved.

  In addition, each application of the 1st radio | wireless part system part 16 and the 2nd radio | wireless part system 17 is not limited to the combination of Bluetooth and Wi-Fi, Wi-Fi (2.400-2.4835GHz) and cellular (2.5-2.69). (GHz) combination is also applicable. These combinations do not have the same operating frequency, but because the operating frequencies are close to each other, there is a considerable deterioration in antenna performance due to electromagnetic coupling effects. By using this embodiment, it is possible to prevent deterioration of antenna performance. In this case, Wi-Fi is disposed on the first antenna element 18 and cellular is disposed on the second antenna element 19.

  The present invention is useful as a mobile phone, for example, and can be used for various portable electronic devices such as portable televisions, notebook computers, and electronic books.

10 Mobile devices
DESCRIPTION OF SYMBOLS 11 1st housing | casing 12 2nd housing | casing 13 3rd housing | casing 14 1st hinge part 15 2nd hinge part 16 1st wireless system part 17 2nd wireless system part 18 1st antenna element 19 2nd antenna element 20 Display part DESCRIPTION OF SYMBOLS 21 1st circuit board 22 2nd circuit board 30 Portable terminal 31 High frequency switching means 32 Reactance element 33 Wireless system detection means 34 Opening / closing detection means 40 Portable terminal 41 3rd wireless system part 42 3rd antenna element

Claims (5)

A first housing;
A second housing;
A third housing;
A first hinge portion that connects the first housing and the second housing so as to be freely opened and closed;
A second hinge portion rotatably connecting the second housing and the third housing;
A first circuit board disposed in the first housing;
A second circuit board disposed in the third housing;
A display unit disposed in the third housing;
A first wireless system unit disposed in the first casing or the third casing;
A second wireless system unit disposed in the first housing or the third housing, wherein at least part of the operating frequency is the same as the first wireless system unit;
A first antenna element disposed in the first housing and electrically connected to the first wireless system unit;
A second antenna element disposed in the third housing and electrically connected to the second wireless system unit,
The distance between the first antenna element and the second antenna element when the display unit is disposed outside and closed is the distance between the first antenna element and the second antenna element when the display unit is disposed inside and closed. A portable terminal characterized by being larger than a distance from two antenna elements. In the state where the display unit is disposed outside and closed, the first antenna element and the second antenna element are disposed at positions facing each other in the thickness direction of the housing,
A portable terminal, wherein the first antenna element and the second antenna element are arranged at positions that do not overlap each other in a thickness direction of the housing in a state where the display unit is arranged and closed. The first antenna element is disposed at one end in the width direction and on the side facing the first hinge part in the first housing,
The second antenna element is disposed on the same side as the one end where the first antenna element is disposed in the side direction facing the second hinge part side in the third housing and in the width direction. The portable terminal according to claim 1 or 2, characterized in that High-frequency switching means connected to the second antenna element; reactance elements connected to the high-frequency switching means and a ground pattern serving as a ground potential of the second circuit board; and the first high-frequency switching means connected to the high-frequency switching means. Two wireless system units; a detecting unit that detects a closed state where the display unit is not disposed outside the portable terminal; a detection unit that detects a detection result of the detecting unit and an operation of the first wireless system unit; The second antenna element and the reactance element in the high-frequency switching means when the control unit detects the operation of the first wireless system unit in a closed state where the display unit is not disposed outside the portable terminal. In other states, the high-frequency switching means electrically connects the second antenna element and the second radio system unit. The mobile terminal according to any one of claims first through claim 3, characterized in that connected. A third radio system unit different from the first radio system unit and the second radio system unit, and a third antenna element for the third radio system unit disposed in the vicinity of the first hinge unit, The portable terminal according to any one of claims 1 to 4.

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