JP2009111698A - Portable terminal and feeding cable routing method of portable terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin portable terminal for feeding power to an antenna using a feeding cable. <P>SOLUTION: A PHS terminal includes a substrate 31, an antenna 20 electrically connected to the substrate 31 via a coaxial cable 60, and a shielding case 40 disposed when stacked to the substrate 31. The PHS terminal adopts a configuration in which a groove portion 41 for disposing the coaxial cable 60 is provided on the shielding case 40. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a portable terminal such as a portable telephone or a PHS (Personal Handy-phone System) terminal and a power supply cable wiring method for the portable terminal.

  In general, mobile terminals such as mobile phones and PHS terminals are mainly configured to have a built-in antenna. For example, the built-in antenna is configured at the end of the mobile terminal (for example, Patent Document 1). reference).

Further, as described in Patent Document 2, for example, the portable terminal having such a configuration is provided on a circuit board on which electronic components and the like are loaded, and suppresses interference of electromagnetic waves by the electronic parts. While the shield case that reinforces the strength of the main body and the flexible board provided on the shield case are sandwiched between the front case and the rear case, the built-in antenna is connected to the circuit board, and from the circuit board It is configured to receive power directly.
JP 2002-51131 A JP 2007-180682 A

  However, the circuit board has been reduced by the downsizing technology of electronic components and the like, and accordingly, there has been a demand for reducing the thickness of the portable terminal. There is a problem that it is difficult to feed power directly from the circuit board to the built-in antenna because the installation place of the built-in antenna and the installation place of the circuit board in the terminal are separated from each other.

  In order to solve the above problem, a wiring method is adopted in which a power feeding cable is connected to a built-in antenna from a circuit board and power is fed. A mechanism for holding and fixing the power supply cable is required separately.For example, when the power supply cable is put on the shield case, the total thickness of the shield case and the diameter of the power supply cable is required. There was a concern of affecting the thinning of mobile terminals.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a thin portable terminal that feeds power to an antenna using a feeding cable.

In order to solve the above problems, the present invention provides a portable device including a board, an antenna element electrically connected to the board via a power supply cable, and a shield case arranged in a stacked state with the board. It is a terminal and employ | adopts the structure that the groove part which arrange | positions the said electric power feeding cable is provided in the said shield case.
By adopting such a configuration, in the present invention, the power feeding cable is disposed in a groove provided in the shield case.

Moreover, this invention employ | adopts the structure of having a fixing | fixed part which contacts the said electric power feeding cable and fixes in the said groove part.
By adopting such a configuration, in the present invention, the feeding cable is fixed in the groove and can be prevented from floating.

Further, the present invention employs a configuration in which the power feeding cable is a coaxial cable, and the outer conductor of the coaxial cable and the fixed portion are electrically connected.
By adopting such a configuration, in the present invention, the antenna element is fed by a coaxial cable that can reduce noise and attenuation from the outside, and the electrical length of the external conductor is brought into contact with the fixed portion by contacting the external conductor. Can be adjusted.

Further, the present invention employs a configuration in which the contact position between the outer conductor and the fixed portion is set based on the use frequency of the antenna element.
By adopting such a configuration, in the present invention, the outer conductor resonates depending on the use frequency of the antenna element, which affects the antenna performance.By adjusting the electrical length based on the use frequency, Resonance can be prevented.

Moreover, this invention employ | adopts the structure that the said contact position is a position which does not resonate with the said use frequency.
By adopting such a configuration, the present invention can prevent resonance and improve antenna performance.

The present invention also provides a power supply cable wiring method for a mobile terminal including a substrate, an antenna element electrically connected to the substrate via a power supply cable, and a shield case disposed in a stacked state with the substrate. Therefore, a configuration is adopted in which a groove is provided in the shield case, and the power feeding cable is disposed in the groove.
By adopting such a configuration, in the present invention, the power feeding cable is disposed in a groove provided in the shield case.

According to the present invention, there is provided a portable terminal including a substrate, an antenna element electrically connected to the substrate via a power supply cable, and a shield case arranged in a stacked state with the substrate, By adopting a configuration in which the case is provided with a groove portion in which the power feeding cable is arranged, the power feeding cable is arranged in the groove provided in the shield case.
In other words, it is possible to prevent the feeding cable from being arranged on the shield case and to generate a thickness corresponding to the diameter of the feeding cable, and it is not necessary to separately provide a mechanism for holding the feeding cable, so that a thinner mobile phone is provided. There is an effect that a terminal can be obtained.

(First embodiment)
Next, a first embodiment of the present invention will be described with reference to the drawings. In the following description, an example in which the portable terminal of the present invention is applied to a PHS (Personal Handy-phone System) terminal will be described.

First, an external configuration of the PHS terminal A will be described with reference to FIG.
FIG. 1 is a perspective view showing an appearance of a PHS terminal A in the present embodiment.
As shown in FIG. 1, the PHS terminal A is of a folding type in which a display side main body 1 and an operation side main body 2 are connected by a hinge structure 3. In the following description, the surfaces where the PHS terminal A is folded by the hinge structure 3 and the display-side main body 1 and the operation-side main body 2 are in contact with or face each other will be described as the display-side facing surface 1a and the operation-side facing surface 2a, respectively. There is a case.

  The display-side body 1 includes a display-side housing 4 that forms an exterior of the display-side body 1, a display unit 5 that is provided on one surface (display-side facing surface 1 a) of the display-side housing 4, It has the structure which has the earpiece 6 provided on the same surface and the display part 5 above.

The display unit 5 is formed from, for example, a liquid crystal display, an organic EL (Electro Luminescence) display, or the like, and displays a desired image, characters, and the like. The display unit 5 is fitted in a substantially central portion of the display-side housing 4. Provided.
The earpiece 6 is formed above the display unit 5 and communicates with a speaker (not shown) provided in the display-side housing 4 and the outside.

  The operation side main body 2 includes an operation side casing 7 that forms an exterior of the operation side main body 2, an operation unit 8 provided on one surface of the operation side casing 7 (operation side facing surface 2 a), and an operation unit 8 and a mouthpiece 9 that is provided on the same plane as that of FIG.

The operation-side casing 7 forms an exterior of the operation-side main body 2, and includes a front case 7a that constitutes the operation-side facing surface 2a side, and the reverse side of the operation-side main body 2 with respect to the operation-side facing surface 2a The rear case 7b is configured. The front case 7a and the rear case 7b can be coupled to each other in the thickness direction of the operation side main body 2.
The operation unit 8 includes a power key, a numeric keypad, and various function keys, and is configured to receive various operation instructions from the user.
The mouthpiece 9 is formed below the operation unit 8 and communicates with a microphone (not shown) provided in the operation side housing 7.

Next, the internal configuration of the PHS terminal A will be described with reference to FIG.
FIG. 2 is a functional block diagram showing the main functional configuration of the PHS terminal A.
The PHS terminal A has a communication unit 10 to which an antenna (antenna element) 20 is connected and a control unit 11 inside, and the communication unit 10, the operation unit 8 and the display unit 5 are connected to the control unit 11. It becomes the composition which is done.

The communication unit 10 is configured to transmit / receive various control signals and data signals to / from a base station (not shown) via the antenna 20 and output received information to the control unit 11 under the control of the control unit 11. Yes.
The antenna 20 is a built-in antenna that is provided inside the operation-side main body 2 and includes an antenna conductor that transmits and receives radio waves and a dielectric.

  The control unit 11 inputs and outputs signals to and from the internal memory including a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory), and the communication unit 10, the operation unit 8, and the display unit 5. Each of these is composed of an interface circuit and the like, and is configured to control the overall operation of the PHS terminal A based on a control program stored in the ROM. For example, the control unit 11 can receive a signal input from the operation unit 8 and cause the display unit 5 to display a predetermined image or cause the communication unit 10 to start operations such as data transmission / reception.

Next, the internal structure of the operation side main body 2 will be described in detail with reference to FIG.
FIG. 3 is an exploded perspective view showing members constituting the operation-side main body 2.
The operation side main body 2 includes a battery 30 as a power source, a substrate 31 provided with electronic components such as a CPU constituting the control unit 11, a shield case 40 for improving the strength of the operation side main body 2, and the operation unit 8. It has the structure which has the flexible substrate 50 which detects pressing.

  The operation-side main body 2 having such a configuration includes a rear case 7b, a battery 30 and a substrate 31 provided on the inner surface side of the rear case 7b, a shield case 40 provided on the battery 30 and the substrate 31, and a shield case 40. The flexible substrate 50 provided above and the front case 7a having the operation unit 8 described above are disposed so as to overlap each other.

  The battery 30 is a rechargeable storage battery that serves as a power source, and has a plate shape that occupies approximately half the area of the inner surface of the rear case 7b. The battery 30 is detachably disposed on the inner surface of the rear case 7b on the distal end side with respect to the base end on which the hinge structure 3 is provided.

  The substrate 31 has an electric circuit that receives power from the battery 30 via an electronic component such as a power supply IC (Integrated Circuit) and supplies power to the electronic component such as a CPU. The substrate 31 is formed in a plate shape having substantially the same area as the remaining area of the inner surface of the rear case 7b occupied by the battery 30, and is on the base end side and in the same plane as the battery 30 in the thickness direction. Placed on top.

The flexible substrate 50 is provided on the shield case 40, and an end portion 50 a extending to one end in the width direction is bent and is electrically connected to the substrate 31 disposed on the back side of the shield case 40. The flexible substrate 50 is formed in a thin film shape and has flexibility, and a switch sheet 51 formed integrally on a surface facing the front case 7a is arranged.
On the surface of the switch sheet 51, a plurality of switches 51a corresponding to the keys of the operation unit 8 are provided. When the operation unit 8 is pressed, the switch 51a is pressed to detect the pressing of the operation unit 8. ing.

The shield case 40 is a conductive member and is formed by aluminum die casting or the like, and a groove portion 41 (described later) is provided along the edge portion. The shield case 40 has a section (not shown) corresponding to the size of each electronic component described above on the surface facing the substrate 31, and by enclosing the electronic components on the substrate 31 by the section. In addition, interference between electronic components due to noise or electromagnetic waves generated from the electronic components is suppressed. Further, the shield case 40 has substantially the same area as the operation side contact surface 2a, and is configured to improve the strength of the operation side main body 2 that has been reduced in thickness.
The shield case 40 is provided with an antenna holder 45 that supports the antenna 20 on the other end side. The antenna holder 45 is made of a plastic made of an insulator, and is configured to prevent the antenna characteristics of the antenna 20 from deteriorating due to electrical conduction.

As described above, since the substrate 31 is provided on the base end side and the antenna 20 is provided on the other end side, the substrate 31 and the antenna 20 cannot be directly fed. Therefore, in this embodiment, the wiring method shown in FIG. 4 is adopted.
FIG. 4A is a perspective view showing a state in which the substrate 31, the shield case 40, and the flexible substrate 50 are laminated and integrated.
FIG. 4B is an enlarged view of the groove 41 provided at the edge of the shield case 40.
As shown in FIG. 4, the power supply from the substrate 31 to the antenna 20 is performed via the coaxial cable 60.

  As is well known, the coaxial cable 60 includes an inner conductor that is electrically connected to the antenna 20, an insulator that covers the inner conductor, an outer conductor that is provided so as to cover the periphery of the insulator, and an outer conductor. And a protective sheath. The coaxial cable 60 has a configuration in which electromagnetic waves hardly leak to the outside and transmission in a wide frequency range is possible.

  The shield case 40 is provided with a groove 41 along the edge, and the groove 41 has a width and a depth substantially the same as the diameter of the coaxial cable 60. Further, as shown in FIG. 4B, a plurality of protrusions (fixed portions) 41 a for pressing the coaxial cable 60 in the width direction are provided in the groove portion 41 at intervals in the length direction. .

Then, the wiring method of the coaxial cable 60 from the board | substrate 31 to the antenna 20 is demonstrated.
First, one end of the coaxial cable 60 is electrically connected to the substrate 31 via solder or the like.
Next, the coaxial cable 60 is guided from the substrate 31 onto the shield case 40, and the coaxial cable 60 is wired toward the antenna 20 in the groove portion 41 provided on the shield case 40. At this time, the coaxial cable 60 is pressed and fixed in the width direction by the protrusion 41 a provided in the groove 41.
Then, by connecting the other end of the coaxial cable 60 led out from the end portion of the groove portion 41 to the antenna 20 provided on the antenna holder 45, the substrate 31 and the antenna 20 are electrically connected to perform power feeding. It will be.

  With such wiring, as shown in the right side view of FIG. 4A shown in FIG. 5, the coaxial cable 60 is disposed in the groove portion 41, so that the thickness corresponding to the diameter of the coaxial cable 60 is increased in the thickness direction. Therefore, the operation-side main body 2 can be thinned.

Therefore, according to the first embodiment described above, the substrate 31, the antenna 20 electrically connected to the substrate 31 via the coaxial cable 60, and the shield case 40 disposed in a stacked state with the substrate 31 are included. By adopting a configuration in which the groove 41 for arranging the coaxial cable 60 is provided in the shield case 40, the coaxial cable 60 is approximately the diameter of the coaxial cable 60 provided in the shield case 40. It arrange | positions in the groove part 41 which has the same width and depth.
That is, it is possible to prevent the coaxial cable 60 from being disposed on the shield case 40 and causing a thickness corresponding to the diameter of the coaxial cable 60 in the thickness direction, and a mechanism for holding the coaxial cable 60 needs to be provided separately. Therefore, the thin PHS terminal A can be obtained.

  Moreover, in 1st Embodiment, the coaxial cable 60 is fixed in the groove part 41, and it floats by employ | adopting the structure of having the protrusion 41a which contacts the coaxial cable 60 and fixes in the groove part 41. Can be prevented.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following description, the description of the part having the same configuration as that of the first embodiment is omitted.

  In the first embodiment, the coaxial cable 60 is disposed in the groove 41 provided on the shield case 40, so that the PHS terminal A can be thinned. Depending on the case, the outer conductor of the coaxial cable 60 may resonate with the frequency of the radio waves of the antenna 20, which may cause a deterioration in antenna characteristics. Even if it is attempted to adjust the length of the coaxial cable 60 in order to prevent the resonance, the installation space inside the operation-side main body 2 is limited, and the length adjustment of the coaxial cable 60 is not easy. Therefore, the wiring method shown in FIG. 6 is adopted.

FIG. 6 is an enlarged plan view of the groove 41 provided at the edge of the shield case 40.
As shown in FIG. 6, the coaxial cable 60 is in a state in which a part of the sheath that is the exterior of the coaxial cable 60 is peeled off and the outer conductor 60 a is exposed.
The outer conductor 60a is in contact with the protrusion 41a disposed in the groove 41 in the width direction. Here, since the protrusion 41a is a part of the shield case 40, the protrusion 41a has conductivity, and is electrically connected to the external conductor 60a and serves as a ground.
In this way, by electrically connecting the outer conductor 60a and the protrusion 41a, not the physical length of the coaxial cable 60 but the electrical length (electric length) is adjusted so that the antenna characteristics are improved. It is possible to prevent the occurrence of resonance that decreases.
The contact position at which the outer conductor 60a of the coaxial cable 60 and the protrusion 41a are brought into contact with each other is preferably set based on the operating frequency of the antenna 20 through experiments or the like and adjusted to a position where resonance does not occur.

  Therefore, in the second embodiment described above, the electrical length of the external conductor 60a can be adjusted by adopting a configuration in which the external conductor 60a of the coaxial cable 60 and the protrusion 41a are electrically connected.

  Further, in the second embodiment, by adopting a configuration in which the contact position between the outer conductor 60a and the protrusion 41a is set based on the use frequency of the antenna 20, the outer conductor 60a depends on the use frequency of the antenna 20. Resonance will affect the antenna performance, and resonance can be prevented by adjusting the electrical length based on the frequency used.

  In the second embodiment, by adopting a configuration in which the contact position is a position that does not resonate with the use frequency, resonance can be prevented and the antenna performance can be improved.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above-described embodiment, it has been described that the groove portion 41 is provided along the edge portion of the shield case 40. However, in the present invention, the groove portion 41 is not limited to the configuration provided in the edge portion. The groove portion 41 may be provided so as to be bent or detoured so that 60 has an optimum electrical length.

It is a perspective view which shows the external appearance of the PHS terminal in embodiment of this invention. It is a functional block diagram which shows the principal part function structure of the PHS terminal in embodiment of this invention. It is a disassembled perspective view which shows the member which comprises the operation side main body in embodiment of this invention. It is a figure explaining the wiring of the electric power feeding cable in embodiment of this invention. It is a right view of Fig.4 (a) in embodiment of this invention. It is an enlarged plan view of the groove part provided in the edge part of the shield case in another embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 20 ... Antenna (antenna element), 31 ... Board | substrate, 40 ... Shield case, 41 ... Groove part, 41a ... Projection part (fixed part), 60 ... Coaxial cable (feeding cable), A ... PHS terminal (mobile terminal)

Claims (10)

A portable terminal including a substrate, an antenna element electrically connected to the substrate via a power supply cable, and a shield case arranged in a stacked state with the substrate,
A portable terminal, wherein the shield case is provided with a groove for arranging the feeding cable.   The mobile terminal according to claim 1, further comprising a fixing portion that contacts the power supply cable and fixes the power cable in the groove portion.   The portable terminal according to claim 2, wherein the power feeding cable is a coaxial cable, and an outer conductor of the coaxial cable and the fixing portion are electrically connected to each other.   The mobile terminal according to claim 3, wherein a contact position between the outer conductor and the fixed portion is set based on a use frequency of the antenna element.   The mobile terminal according to claim 4, wherein the contact position is a position that does not resonate with the use frequency. A power supply cable wiring method for a mobile terminal including a substrate, an antenna element electrically connected to the substrate via a power supply cable, and a shield case arranged in a stacked state with the substrate,
A power feeding cable wiring method for a mobile terminal, wherein a groove portion is provided in the shield case, and the power feeding cable is disposed in the groove portion.   The power supply cable wiring method for a mobile terminal according to claim 6, further comprising: a fixing portion that is fixed in the groove portion, wherein the fixing portion and the power supply cable are brought into contact with each other and fixed in the groove portion.   The method of claim 7, wherein the power supply cable is a coaxial cable, and electrically connects an outer conductor of the coaxial cable and the fixed portion.   9. The method of claim 8, wherein the contact position between the outer conductor and the fixed portion is set based on a use frequency of the antenna element.   The method of claim 9, wherein the contact position is a position that does not resonate with the use frequency.

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