JP2011029807A - Portable terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the radiation characteristic of an antenna in a portable terminal device provided with a first housing and a second housing connected by a connection part mutually rotatably or slidably, wherein the antenna is arranged at a position away from the connection part of the first housing or the second housing. <P>SOLUTION: A hinge part 31 mechanically connects and electrically conducts the first housing 11 and the second housing 21. The hinge part 31 conducts a ground electrode of a first circuit board 12. A ground connection conductor 33 is provided between the hinge part 31 and a ground electrode of a second circuit board 22. The ground connection conductor 33 electrically connects ground electrodes of the first circuit board 12 and the second circuit board 22 to each other, apart from a flexible cable 32 being a signal cable. According to this structure, housing radiation by the first housing 11 and the second housing 21 can effectively be used, and the radiation characteristic of the antenna 24 installed on a bottom part is improved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a portable terminal device that includes a first housing and a second housing that are connected to each other by a connecting portion so as to be rotatable or slidable, and in which an antenna is provided in the first or second housing. is there.

  Patent Document 1 and Patent Document 2 are disclosed as antenna characteristics controlled in a portable terminal device incorporating an antenna.

Patent Document 1 discloses the following configuration.
In a bar-type mobile terminal device in which two substrates are arranged in a housing, the antenna is installed at the bottom position (microphone position), and the top position of the substrate is reactance connected. Further, in the clamshell / slide type portable terminal device in which the substrates are arranged in the upper and lower casings, the upper and lower substrates are connected in a reactance manner when closed.

Patent Document 2 shows the following configuration.
In a clamshell type mobile terminal device, a plurality of ground connection lines are superimposed on a flexible cable connecting upper and lower substrates, and an antenna is laid out at the TOP position of the lower substrate. And a capacitive element is arrange | positioned at one or both of the port parts of the upper and lower substrates connected to a flexible cable.

  FIG. 1 is a diagram illustrating a configuration of a mobile terminal device disclosed in Patent Document 2. As illustrated in FIG. As shown in FIG. 1, a first ground conductor 1 is provided on the upper substrate, and a second ground conductor 2 is provided on the lower substrate. The radiating element 3 is installed in the vicinity of the interval portion connected to the second ground conductor 2 and constituted by the plurality of ground conductors 1 and 2. A plurality of ground conductors 1 and 2 are flexibly connected to each other by a flexible cable 5 that connects the plurality of ground conductors 1 and 2 and a connector 4. An inductor element 6 and a capacitive element 7 are connected to the flexible cable 5.

Special table 2008-541610 JP 2002-246822 A

  The portable terminal device of Patent Document 1 is a structure intended to reduce electromagnetic field radiation to the speaker side to which the human body is close when talking in a closed state of the upper and lower casings. The antenna characteristics cannot be improved.

  The portable terminal device of Patent Document 2 has a structure intended to improve the characteristics of the antenna mounted on the hinge portion, and cannot improve the characteristics of the antenna disposed on the bottom portion (or top portion).

  An object of the present invention includes a first casing and a second casing that are connected to each other by a connecting portion so as to be rotatable or slidable, and are separated from the connecting portion of the first casing or the second casing. The present invention relates to a mobile terminal device in which an antenna is disposed at a position, and the radiation characteristics of the antenna are improved.

In order to solve the above problems, the present invention is configured as follows.
The first casing and the second casing, which are connected to each other by the connecting portion so as to be rotatable or slidable, the first circuit board stored in the first casing, and the second casing. The second circuit board, the signal cable for electrically connecting the first circuit board and the second circuit board at the connecting portion, and the first casing or the second casing. In the mobile terminal device in which the antenna is arranged at a position away from the connecting portion,
Connection means for electrically connecting the first circuit board and the second circuit board separately from the signal cable is provided in the connecting portion.

  The connecting portion may mechanically connect the first housing and the second housing and electrically connect the first housing and the second housing, and the connecting means may include at least a part of the connecting portion.

The connecting means may include a reactance element.
The reactance element may be a variable reactance element.

  The reactance component of the portion that electrically connects the upper and lower substrates can be reduced, and the radiation characteristic of the antenna at the position (bottom portion or top portion) away from the connecting portion of the first housing or the second housing is improved. . Further, by loading a reactance element (lumped constant element) in the connection means, the radiation characteristics of the antenna can be improved at an arbitrary frequency. Furthermore, by loading the reactance variable element, the radiation characteristics for a plurality of frequency bands can be improved.

It is a figure which shows the structure of the portable terminal device of patent document 2. FIG. It is a figure which shows the structure of the portable terminal device 101 which concerns on 1st Embodiment. It is a figure which shows the structure of another portable terminal device 102 which concerns on 1st Embodiment. It is a figure which shows the structure of the portable terminal device 103 which concerns on 2nd Embodiment. It is a figure which shows the structure of another portable terminal device 104 which concerns on 2nd Embodiment. It is a figure which shows the structure of the portable terminal device 105 which concerns on 3rd Embodiment. It is a figure which shows the structure of another portable terminal device 106 which concerns on 3rd Embodiment. It is a figure which shows the structure of the portable terminal device 107 which concerns on 4th Embodiment.

<< First Embodiment >>
The configuration of the two portable terminal devices according to the first embodiment will be described with reference to FIGS.
FIG. 2 is a diagram illustrating the structure of the mobile terminal device 101. The portable terminal device 101 is a clamshell type / swivel type / slide type portable terminal device, and includes a first casing 11 and a second casing 21. A first circuit board 12 is housed in the first housing 11, and a second circuit board 22 is housed in the second housing 21. The first circuit board 12 is a circuit board on the display unit side, and a liquid crystal panel 13 is connected to the first circuit board 12. The second circuit board 22 is a circuit board on the keyboard side, and is provided with an antenna 24.

  The first circuit board 12 and the second circuit board 22 are electrically connected by a flexible cable 32 that is a signal cable. In addition to the flexible cable 32, a ground connection conductor 33 that connects the ground electrode of the first circuit board 12 and the ground electrode of the second circuit board 22 is provided in the connecting portion 30.

  With the structure described above, since the ground electrode of the first circuit board 12 and the ground electrode of the second circuit board 22 are directly connected by the ground connection conductor 33, the first casing 11 and the second casing are connected. The electrical length of the entire casing by the body 21 is substantially shortened. Therefore, as will be described later, the case radiation can be used effectively, and the radiation characteristics of the antenna 24 mounted on the bottom portion of the mobile terminal device are improved.

  Since the flexible cable 32 passes through the connecting portion 30 such as the hinge mechanism portion, the flexible cable 32 has a physically appropriate length, and an electrical inductance component is generated. Therefore, the electrical length becomes longer than the physical length of the housing. The case radiation contributes to the improvement of the antenna radiation characteristics when the optimum electrical length is obtained for a certain wavelength, but if the electrical case length becomes too long, the antenna characteristics are not improved in the desired frequency band. .

  According to the structure of the above-described portable terminal device of the present invention, there are two connection points connecting the first circuit board 12 and the second circuit board 22, and equivalent inductors are connected in parallel. The electrical casing length is substantially shortened. Therefore, the above-described housing radiation can be made effective in a desired frequency band, and the radiation characteristics of the antenna 24 are improved.

FIG. 3 is a diagram illustrating the structure of the mobile terminal device 102. The portable terminal device 102 is a clamshell type / swivel type / slide type portable terminal device.
In the mobile terminal device 101 shown in FIG. 2, the antenna is arranged on the second circuit board side, that is, on the bottom portion. However, the mobile terminal device 102 shown in FIG. An antenna 14 is disposed in the part.

As described above, the portable terminal device 102 in which the antenna 14 is arranged on the top portion can also effectively use the case radiation, and the radiation characteristics of the antenna 14 are improved.
Note that a thin coaxial cable may be used instead of the flexible cable 32.

<< Second Embodiment >>
Configurations of two portable terminal devices according to the second embodiment will be described with reference to FIGS. 4 and 5.
FIG. 4 is a diagram illustrating the structure of the mobile terminal device 103. The mobile terminal device 103 is a clamshell type mobile terminal device, and a connecting portion for mechanically connecting the first housing 11 and the second housing 21 and electrically connecting them is constituted by a hinge portion 31. Has been.

  The hinge part 31 is electrically connected to the ground electrode of the first circuit board 12. A ground connection conductor 33 is provided between the hinge portion 31 and the ground electrode of the second circuit board 22.

  FIG. 5 is a diagram showing the structure of the mobile terminal device 104. The mobile terminal device 104 is also a clamshell type mobile terminal device, and a connecting portion that connects the first housing 11 and the second housing 21 is constituted by a hinge portion 31.

  The hinge part 31 is electrically connected to the ground electrode of the second circuit board 22. A ground connection conductor 33 is provided between the hinge portion 31 and the ground electrode of the first circuit board 12.

  As described above, the present invention can be applied to a general portable terminal device in which the hinge portion exists, and the effects described in the first embodiment can be achieved.

<< Third Embodiment >>
The configuration of two portable terminal devices according to the third embodiment will be described with reference to FIGS.
The mobile terminal device shown in the third embodiment is an example of a mobile terminal device including a reactance element in the connection means.

  FIG. 6 is a diagram illustrating the structure of the mobile terminal device 105. What is different from the portable terminal device 103 shown in FIG. 4 is a configuration of connection means for electrically connecting the first circuit board 12 and the second circuit board 22. A capacitor 34 is connected in series to a ground connection conductor 33 that connects between the hinge portion 31 and the ground electrode of the second circuit board 22. Other configurations are the same as those of the mobile terminal device 103 shown in FIG.

  FIG. 7 is a diagram illustrating the structure of the mobile terminal device 106. In this example, an inductor 35 is connected in series to a ground connection conductor 33 that connects between the hinge portion 31 and the ground electrode of the second circuit board 22. Other configurations are the same as those of the mobile terminal device 103 shown in FIG.

  In the example shown in FIGS. 6 and 7, the reactance element is provided on the second circuit board 22 side. However, for example, like the mobile terminal device 104 in FIG. 5, the ground connection is made on the first circuit board 12 side. When the conductor 33 is provided, a reactance element may be provided on the first circuit board 12 side.

  Thus, by including the reactance element in the connecting means, the electrical casing length can be optimized in a desired frequency band. Therefore, it is possible to improve the antenna radiation characteristics according to a desired frequency band, and it is possible to flexibly cope with changes in the terminal structure.

<< Fourth Embodiment >>
A configuration of a mobile terminal device according to the fourth embodiment will be described with reference to FIG.
The mobile terminal device shown in the fourth embodiment is an example of a mobile terminal device that includes a variable reactance element in the connection means.

  FIG. 8 is a diagram showing the structure of the mobile terminal device 107. The difference from the portable terminal devices 105 and 106 shown in FIGS. 6 and 7 is that a variable reactance element 36 is connected in series to the ground connection conductor 33. The variable reactance element 36 is an element whose capacitance is controlled by a control voltage, for example. For example, a varactor diode, a switch diode, a MEMS capacitance variable element, or the like.

  Thus, by providing the variable reactance element in the connection means for connecting the first circuit board and the second circuit board, the reactance of the variable reactance element can be adjusted according to a desired frequency band. Therefore, antenna radiation characteristics can be improved in a plurality of frequency bands. That is, by adjusting the reactance of the variable reactance element in accordance with the application specification of the mobile terminal device, the case radiation can be effectively utilized in each frequency band.

DESCRIPTION OF SYMBOLS 11 ... 1st housing | casing 12 ... 1st circuit board 13 ... Liquid crystal panel 14 ... Antenna 21 ... 2nd housing | casing 22 ... 2nd circuit board 24 ... Antenna 30 ... Connection part 31 ... Hinge part 32 ... Flexible cable 33 ... Ground connection conductor 34 ... Capacitor 35 ... Inductor 36 ... Variable reactance elements 101-107 ... Mobile terminal device

Claims (4)

The first casing and the second casing, which are connected to each other by the connecting portion so as to be rotatable or slidable, the first circuit board stored in the first casing, and the second casing. The second circuit board, the signal cable for electrically connecting the first circuit board and the second circuit board at the connecting portion, and the first casing or the second casing. In the mobile terminal device in which the antenna is arranged at a position away from the connecting portion,
A portable terminal device in which a connecting means for electrically connecting the first circuit board and the second circuit board separately from the signal cable is provided in the connecting portion.   2. The connection unit according to claim 1, wherein the connection unit mechanically connects and electrically connects the first housing and the second housing, and the connection unit includes at least a part of the connection unit. Mobile terminal device.   The mobile terminal device according to claim 1, wherein the connection unit includes a reactance element.   The mobile terminal device according to claim 3, wherein the reactance element is a variable reactance element.

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