JP2006303911A - Electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electronic equipment with a radio communication function which advances weight reduction of the electronic apparatus such as a portable PC, etc., sufficiently takes a ground area of a radio antenna without increasing the number of processes, and improves antenna performance. <P>SOLUTION: When radio antennas 2, 3 are installed in a bezel which is a framework of an LCD (Liquid Crystal Display) 8, a metal bezel 1 is characterized to work as the ground of a sufficiently wider area of the radio antennas 2, 3 by using the metal bezel 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic device such as a personal computer (hereinafter referred to as a PC) having a wireless communication function.

  In recent years, an increasing number of PCs are provided with a wireless LAN system and can exchange information with wireless signals.

  For example, an antenna having a resonance point in the 2 GHz band may be mounted on the PC side. Or the electronic device which shares the several antenna suitable for the band from which a frequency differs in one antenna apparatus is proposed. Specifically, in a system that requires an antenna with a beam-thinned antenna arranged in the circumferential direction, such as a wireless LAN, it is a frequency-sharing electronic device that enables communication even at the frequency of a PHS or a mobile phone. (For example, refer to Patent Document 1).

  In addition, in order to obtain a good transmission / reception environment, an electronic apparatus that can provide an antenna at a position as high as possible and can transmit and receive even in a closed state like a portable notebook PC has been proposed (for example, see Patent Document 2). .

  As a specific conventional example of the above-described electronic apparatus, a PC that holds a wireless antenna is given, and a method for attaching the wireless antenna and a method for grounding the wireless antenna that are held by the PC will be described below.

  When the display device is, for example, a liquid crystal display device (hereinafter referred to as an LCD), the LCD is fitted in a housing, and a wireless antenna is provided on the LCD and the housing. The method of attaching the wireless antenna to the housing is, for example, when the material of the housing is magnesium, the grounding portion of the wireless antenna is fastened to the magnesium housing with a screw, and the housing serves as a ground for the wireless antenna (ground / GND). Fulfill.

In addition, when the material of the housing is a synthetic resin, the metal tape plays the role of grounding the wireless antenna by fastening the grounding portion of the wireless antenna to the housing of the synthetic resin with a metal tape such as aluminum or copper. Fulfill.
Japanese Patent Laid-Open No. 10-41744 JP 2000-284854 A

  However, as electronic devices such as portable PCs have become lighter and there are increasing cases of synthetic resin enclosures rather than magnesium enclosures, grounding by attaching aluminum tape or the like to the radio antenna grounding part This is disadvantageous in terms of the number of processes, weight, and thickness.

  Accordingly, the present invention provides an electronic device equipped with a wireless communication function that improves the antenna performance by reducing the weight of an electronic device such as a portable PC, increasing the grounding area of the wireless antenna without increasing the number of processes. The purpose is to do.

  The present invention comprises a display device, a metal bezel provided on the outer periphery of the display device, one or more radio antennas attached to the metal bezel, and a transmission / reception means for the radio antenna, The electronic device is grounded by the metal bezel.

  ADVANTAGE OF THE INVENTION According to this invention, the grounding area of a radio | wireless antenna can fully be taken with a metal bezel, and the electronic device which improved antenna performance can be provided.

  Hereinafter, an embodiment of an electronic apparatus according to the present invention will be described with reference to the drawings, taking a PC as an example.

[First Embodiment]
FIG. 1 is an external view showing a PC according to the first embodiment.

  A metal bezel 1 rises from the rear part of the PC body 7. The metal bezel 1 has a frame shape and houses an LCD 8. Radio antennas 2 and 3 are erected on the upper surface of the metal bezel 1 at a predetermined interval. The back surface of the metal bezel 4 is provided with a synthetic resin casing (not shown).

  The two wireless antennas 2 and 3 extend from the antenna cables (coaxial lines) 4 and 5 and are connected to the wireless LAN transmission / reception unit 6 built in the PC main body 7.

  Here, the radio antennas 2 and 3 will be described in detail with reference to FIG.

  For example, the wireless antennas 2 and 3 have resonance points in the 2 GHz band and are inverted F-type antennas as shown in FIG. As shown in FIG. 2, the inverted F-type antenna 9 is a kind of radio antenna, and is called an inverted F-type antenna because the shape looks like a shape in which F is tilted, and is provided on the ground plane 10. The grounding surface 10 corresponds to the metal bezel 1. In addition, the inverted F-type antenna 9 is supplied with power from the power supply unit 11, specifically, wireless LAN transmission / reception via the antenna cables 4 and 5 having the inherent impedance (for example, 50Ω) of FIG. 1. Power is supplied from the unit 6.

  The inverted F-type antenna 9 has omnidirectional characteristics because currents exist in a plurality of directions on the antenna, and has a good performance as an antenna. However, a large ground area is required to fully exploit this characteristic. By grounding the metal bezel 1 as in the present embodiment, a sufficiently large grounding area can be secured, and the characteristics of the inverted F-type antenna as described above can be sufficiently extracted.

  In a portable PC, the antenna portion needs to be small and thin. Therefore, the radio antennas 2 and 3 are formed by, for example, a flexible printed circuit (hereinafter referred to as FPC). In this case, since an inverted F-type metal thin film is sandwiched between synthetic resin thin film sheets, a part of the metal thin film is protruded from the thin film sheet, and the protruding metal thin film is applied to the metal bezel. Fix and electrically connect. As a result, the metal bezel 1 can be grounded, and a sufficient grounding area can be secured.

  By using the wireless antennas 2 and 3 of the inverted F antenna and the wireless LAN transmission / reception unit 6 as described above, information can be exchanged with a wireless signal between PCs, for example.

  The position of the wireless LAN transmitting / receiving unit 6 and the sizes of the wireless antennas 2 and 3 are finely adjusted according to a desired frequency.

[Example of change]
In FIG. 1, the wireless antennas 2 and 3 are provided outside, but when the metal bezel is housed in a synthetic resin casing, the wireless antennas 2 and 3 can be provided inside the housing.

  Moreover, you may accommodate the metal bezel 1 in metal housings, such as magnesium. In this case, only the portion corresponding to the radio antennas 2 and 3 can be transmitted / received wirelessly by changing to a material such as synthetic resin that does not shield radio waves, so that the radio antennas 2 and 3 can be provided inside. For example, only the portions corresponding to the radio antennas 2 and 3 are covered with a synthetic resin cover.

  In the above embodiment, the number of the radio antennas 2 and 3 is two. However, the number of radio antennas can be increased to three or more in order to sufficiently perform a desired radio antenna function.

  In the above-described embodiment, the description has been given using the LCD. However, instead of this, the present invention is applied to a metal bezel that houses a display of a type such as an organic EL display device, an inorganic EL display device, and a plasma display.

[Second Embodiment]
Next, a PC according to the second embodiment will be described with reference to FIG.

  FIG. 3 is an external view of the PC of this embodiment. In addition, the same code | symbol is attached | subjected to the part equivalent to FIG. 1, and the description is abbreviate | omitted.

  Reference numerals 13 and 14 are detachable wireless antennas, and reference numeral 12 is a metal bezel having cut portions 15 and 16 so that the wireless antennas 13 and 14 can be attached.

  In addition, by providing the some notch parts 15 and 16, while being able to install the 3 or more several radio | wireless antennas 13 and 14 as mentioned above, the position adjustment of the radio | wireless antennas 13 and 14 can also be made easy.

  When the wireless antennas 13 and 14 are formed of FPC, a part of the metal thin film may be protruded and connected as in the first embodiment, but instead, a metal thin film is attached to the thin film sheet. You may attach to the cut | notch parts 15 and 16 in the accommodated state. In this case, although it seems that it is not electrically connected, if the thickness of the thin film sheet that is an insulator is about 10 or more microns, it can be regarded as a conductive state by capacitive coupling at a frequency of 1 GHz or more. This is because sufficient electrical connection can be obtained. Therefore, the metal bezel 12 can sufficiently serve as a ground.

  Also in the first embodiment, the metal bezel 1 may be fixed in a state where the metal thin film is housed in the thin film sheet.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

It is an external view of PC in 1st embodiment of this invention. It is explanatory drawing of the inverted F type antenna used for the antenna holding | maintenance apparatus of FIG. It is an external view of PC in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal bezel 2, 3 Wireless antenna 4, 5 Antenna cable 6 Wireless LAN transmission / reception part 7 PC main body 8 LCD
9 Inverted F-type antenna 10 Ground plane 11 Power supply unit 12 Metal bezel 13, 14 Radio antenna 15, 16 Metal bezel notch

Claims (5)

In an electronic device having a display device,
A metal bezel covering the display device;
One or more wireless antennas attached to the metal bezel;
The wireless antenna transmitting and receiving means,
The electronic apparatus, wherein the wireless antenna is grounded by the metal bezel. The electronic device according to claim 1, wherein the wireless antenna is detachably attached to the metal bezel. The electronic apparatus according to claim 1, wherein the wireless antenna is an inverted F-type antenna. The electronic device according to claim 1, wherein the wireless antenna is formed of an FPC in which a metal thin film is sandwiched between insulating thin film sheets. 5. The electronic device according to claim 1, wherein the metal bezel is made of a synthetic resin only at the position of the wireless antenna.

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