JP3989200B2 - Computer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic device having a built-in antenna for wireless communication.
[0002]
[Prior art]
In recent years, electronic devices such as personal computers that have a wireless communication function such as a wireless LAN and Bluetooth have become widespread. For the wireless communication such as the wireless LAN or Bluetooth, for example, a radio wave of 2.5 GHz band or 5 GHz band is used. The personal computer having the wireless communication function has a built-in antenna for wireless communication. For example, various antennas such as a dipole antenna, a helical antenna, a slot antenna, and an inverted F antenna are used.
[0003]
[Problems to be solved by the invention]
However, when an antenna is mounted on an electronic device such as a personal computer, there is a problem that the frequency characteristics of the antenna change depending on members located around the antenna, and the frequency characteristics of the antenna alone and the characteristics at the time of mounting differ. . Conventionally, changes in the frequency characteristics of the antenna caused by mounting the antenna on an electronic device as described above are absorbed on the antenna side. For example, by adjusting the shape of the antenna, the frequency characteristic of the antenna at the time of mounting is set to a desired characteristic.
[0004]
However, in the conventional method of adjusting the frequency characteristics at the time of mounting the antenna to the desired characteristics by adjusting the antenna shape, the environment for mounting the antenna differs depending on the model of the electronic device. The change was not uniform and the same antenna could not be used for different models.
[0005]
The present invention has been made to solve the above problems, and by adjusting the mounting state of the antenna, the resonance frequency at the time of mounting the antenna can be adjusted to the center frequency, which is the same for different models. An object of the present invention is to provide an electronic device that can use the antenna.
[0006]
[Means for Solving the Problems]
The present invention provides a computer having a case made of a dielectric material and having a built-in display panel , provided at an upper end portion in an antenna mounting area formed on an inner surface of the case, and at a predetermined interval from the inner surface of the case. A plurality of protrusions protruding in a direction substantially perpendicular to the inner surface and a metal plate having flexibility and a substantially rectangular shape, along one of the sides constituting the substantially rectangular shape The radiating element and the radiating element, which are formed by providing a groove and are located on the projecting side of the antenna mounting area and having a gap between the plurality of projecting parts and the inner surface of the case, are formed. includes a flat-plate and a ground that is fixed to the inner surface located between the inner surface of the display panel and the case are different regions antenna from that region And wherein the door.
[0007]
As described above, the resonant frequency of the antenna alone is set to a frequency higher than the target center frequency, and when the antenna is mounted on the case, the gap between the antenna and the case is adjusted so that the dielectric constant of the case can be reduced. The resonance frequency of the antenna can be adjusted to the target center frequency by adjusting the degree of influence on the antenna, and as a result, the same antenna can be used for different models. Therefore, it is not necessary to prepare a different antenna for each model, and the manufacture and management of the antenna become extremely easy, and the cost can be reduced.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, a description is given using a personal computer (hereinafter abbreviated as a PC) as an example of an electronic device.
[0009]
FIG. 1 shows an external perspective view of a PC.
[0010]
The PC 1 includes a main body case 2, a display unit case 3, an LCD panel 4, and a keyboard 5. The main body case 2 is provided with a keyboard 5 on its upper surface. The main body case 2 and the display unit case 3 are connected to each other by a hinge portion 6 so as to be rotatable. The display unit case 3 supports the peripheral part of the LCD panel 4 so that the display area of the LCD panel 4 becomes visible. The display unit case 3 can be rotated in the direction of the arrow AB via the hinge unit 6 and can be rotated between a closed position that covers the keyboard 5 and an open position that enables the keyboard 5 to be used. . The main body case 2 and the display case 3 are made of a dielectric material such as synthetic resin.
[0011]
In addition, an antenna 7 used in a wireless LAN (IEEE802.11) is provided in the upper part inside the display unit case 3.
IEEE 802.11 is one of the wireless communication standards that use the ISM (Industry Science Medical) band of the 2.4 GHz band. As a spectrum spreading method, a direct spreading method (DSSS: Direct Sequence Spread Spectrum) is used. Communication at a maximum communication speed of 11 Mbps is possible.
[0012]
Since the antenna 7 is ideally provided at a high position in order to improve the reception sensitivity, the antenna 7 is provided on the upper portion of the display unit case 3 that is at a high position in use in consideration of the situation where the PC 1 is used.
[0013]
As the antenna 7, for example, an inverted F antenna shown in FIG. 2 is used. The inverted F-type antenna 7 uses, for example, a rectangular antenna substrate 11, and a groove 12 is provided along the upper side thereof to form an element 13 that is a radio wave radiating element on the upper side of the antenna substrate 11. Is a GND (ground) 14. The element 13 is provided with a feeding point 15 at a position close to the base. In this case, the position is set so that the impedance at the feeding point 15 is, for example, 50Ω.
[0014]
The antenna substrate 11 uses a metal plate having a thickness of about 0.1 mm, for example, and is protected by laminating both surfaces. The width L of the antenna substrate 11 is set to approximately ¼ wavelength (λ). The specific size of the antenna substrate 11 is, for example, about 30 × 30 mm when using a 2.4 GHz band radio wave. The width of the groove 12 is about 2 mm, and the width of the element 13 is about 1 mm.
[0015]
FIG. 3 is a cross-sectional view showing a state where the inverted F-type antenna 7 is mounted on the display unit case 3. The antenna 7 is attached to the upper part inside the display unit case 3 using an adhesive or the like. In this case, the antenna 7 is provided such that the side on which the element 13 is formed protrudes upward by a predetermined width, for example, about 5 to 6 mm from the upper end of the LCD panel 4 that is an electronic component. To avoid being affected.
[0016]
When the antenna 7 is fixed in close contact with the display unit case 3 as described above, the resonance frequency of the antenna 7 moves to the lower side by a frequency depending on the dielectric constant of the display unit case 3. In addition, when a gap is provided between the antenna 7 and the display unit case 3, the degree of influence of the dielectric constant of the display unit case 3 on the antenna 7 decreases as the gap increases, and the frequency change rate of the antenna 7 decreases. Lower.
[0017]
Therefore, the resonance frequency when the antenna 7 is a single unit is set in advance to a frequency that is, for example, about 4% or higher than the target center frequency. Then, when the antenna 7 is mounted on the display unit case 3, the resonance frequency of the antenna 7 is matched with the target center frequency by adjusting the degree of influence of the dielectric constant of the display unit case 3 on the antenna 7.
[0018]
FIG. 4 shows a specific example in the case where the degree of influence of the dielectric constant of the display unit case 3 on the antenna 7 is adjusted. FIG. 4A shows the antenna mounting area of the display unit case 3. FIG. ) Is a cross-sectional view showing a state in which the antenna 7 is mounted on the display unit case 3.
[0019]
In the antenna mounting area 20 of the display unit case 3 shown in FIG. 4A, a plurality of, for example, three ribs 21 having a predetermined length are provided at a predetermined interval at the upper end thereof. As shown in FIG. 4B, the rib 21 is formed integrally with the display unit case 3 so that the cross section is wedge-shaped, that is, the lower part is thin and the upper part is thick.
[0020]
Then, the antenna 7 is attached to the antenna mounting area 20 of the display unit case 3 using an adhesive or a double-sided tape. In this case, the upper ends of the elements 13 and the ribs 21 are matched. The antenna 7 is configured using a conductive member having flexibility, and the upper end portions of the element 13, the groove 12, and the GND 14 are curved along the rib 21, and the antenna 7 is connected to the display unit case 3 at a place other than the rib 21. A gap or space is formed between them.
[0021]
If a desired gap is provided between the element 13 of the antenna 7 and the display unit case 3 as described above, the influence of the dielectric constant of the display unit case 3 on the antenna 7 is reduced. The frequency change rate of the antenna 7 can be adjusted. Therefore, the resonance frequency when the antenna 7 is mounted can be made to coincide with the target center frequency by obtaining in advance an experiment or the like so that the height of the rib 21 is just a good height.
[0022]
For this reason, even if the same antenna 7 is used for models with different antenna 7 mounting environments, the center frequency intended for the resonance frequency when the antenna is mounted by adjusting the gap between the antenna 7 and the display unit case 3 It becomes possible to fit in.
[0023]
In the above embodiment, the case where the cross-sectional shape of the rib 21 is formed in a wedge shape is shown, but other shapes such as a square shape may be formed.
Moreover, although the case where the rib 21 and the display part case 3 were formed integrally was shown in the said embodiment, you may form the rib 21 separately and adhere | attach on the display part case 3 with an adhesive agent.
[0024]
(Second Embodiment)
Next, an antenna mounting method according to a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a cross-sectional view of the antenna mounting portion.
[0025]
In the second embodiment, the lower part of the antenna 7, that is, the lower part of the GND 14 is fixed to the inner side surface of the display unit case 3 by the fixing member 25, and the entire antenna is floated from the display unit case 3. For example, a thick double-sided tape is used as the fixing member 25. Alternatively, the fixing member 25 may be formed of a rib, and the antenna 7 may be fixed using a thin double-sided tape or an adhesive.
[0026]
Then, the distance between the upper portion of the antenna 7 on which the element 13 is formed and the display unit case 3 is adjusted by the thickness of the fixing member 25, and the degree of influence of the dielectric constant of the display unit case 3 on the antenna 7 is adjusted. To do. Accordingly, the thickness of the fixing member 25 is obtained in advance through experiments or the like so that the distance between the upper portion of the antenna 7 and the display unit case 3 is just a good distance, so that the resonance frequency when the antenna 7 is mounted can be obtained. The same effect as in the first embodiment can be obtained.
[0027]
The antenna mounting method shown in FIG. 5 is suitable when the antenna 7 does not have flexibility, but can be used even when it has flexibility.
[0028]
In addition, as shown in FIG. 6, the lower portion of the antenna 7 is fixed to the inner surface of the display unit case 3 by the fixing member 25, and is further shown in the first embodiment between the upper portion of the antenna 7 and the display unit case 3. Alternatively, the rib 21 may be provided and fixed by adhesion. When the rib 21 is provided in this manner, the upper portion of the antenna 7 can be held in a stable state, and fluctuations in frequency characteristics can be prevented.
[0029]
In the example shown in FIG. 6, by adjusting the thickness of the fixing member 25 and the height of the rib 21, the distance between the element 13 and the display unit case 3 changes. The resonance frequency when the antenna is mounted can be adjusted to the target center frequency by adjusting the degree of influence on the antenna 7. The resonance frequency at the time of mounting the antenna can also be adjusted by holding the thickness of the fixing member 25 at a predetermined value and adjusting the height of the rib 21.
[0030]
7 shows a case where the antenna 7 is mounted obliquely on the inner surface of the display unit case 3, that is, the lower part of the antenna 7 is brought into contact with the display unit case 3 and the upper part of the antenna 7 is separated from the display unit case 3. An example is shown. In this case, fixing members 26 and 27 having different thicknesses are provided between the antenna 7 and the display unit case 3 at two locations, the lower portion and the central portion, and the antenna 7 is fixed obliquely. That is, the lower fixing member 26 is thin and the upper fixing member 27 is thick, and the antenna 7 is mounted so that the upper portion of the antenna 7 is separated from the display unit case 3. As the fixing members 26 and 27, for example, double-sided tapes having different thicknesses are used. Alternatively, the fixing members 26 and 27 may be formed of ribs, and the antenna 7 may be fixed using a double-sided tape or an adhesive. Further, the antennas 7 may be fixed obliquely using an adhesive or the like by forming the fixing members 26 and 27 by one continuous rib and making the front surface thereof inclined.
[0031]
In the example shown in FIG. 7, the distance between the element 13 and the display case 3 is changed by adjusting the inclination angle of the antenna 7 according to the thickness of the fixing members 26 and 27. By adjusting the degree of influence of the rate on the antenna 7, the resonant frequency when the antenna is mounted can be adjusted to the target center frequency.
[0032]
In the above-described embodiment, the reverse F type antenna is described as an example of the IEEE802.11b antenna. However, for example, when using other flat antennas such as a dipole antenna, a helical antenna, and a slot antenna, It can be implemented in the same manner as the above embodiment.
[0033]
In the above-described embodiment, an example of an IEEE802.11b antenna has been described. However, the present invention is not limited to this example, and Bluetooth, which is a short-range wireless communication standard, IEEE802.11a, which is a high-speed wireless LAN, or the like. It can also be applied when mounting antennas used in.
[0034]
In the above-described embodiment, the case where the antenna 7 is mounted on the portable personal computer has been described. However, for example, the present invention can be applied to a desktop personal computer when the antenna is mounted on the case of the display unit. . In addition, the present invention can also be implemented in various electronic devices such as a portable terminal and an information terminal having a wireless communication function in the same manner as in the above embodiment.
[0035]
【The invention's effect】
As described in detail above, according to the present invention, in an electronic device having a wireless communication function, when an antenna is mounted on a case made of a dielectric, the dielectric constant of the case is adjusted by adjusting the distance between the antenna and the case. Since the degree of influence of the antenna on the antenna is adjusted, the resonance frequency when the antenna is mounted can be adjusted to the target center frequency, and the same antenna can be used for different models. Therefore, it is not necessary to prepare a different antenna for each model, and the manufacture and management of the antenna become extremely easy, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a personal computer according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a configuration example of an antenna mounted on a personal computer in the embodiment.
FIG. 3 is a cross-sectional view showing the mounting state of the antenna in the embodiment.
4A is a main part configuration diagram of a display unit case for explaining an antenna mounting method in the embodiment, and FIG. 4B is a cross-sectional view of the antenna mounting part.
FIG. 5 is a cross-sectional view of an antenna mounting portion for explaining an antenna mounting method according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view of an antenna mounting portion showing another example of the antenna mounting method in the embodiment.
FIG. 7 is a cross-sectional view of an antenna mounting portion showing still another example of the antenna mounting method in the embodiment.
[Explanation of symbols]
1 ... PC (personal computer)
2 ... Main unit case 3 ... Display unit case 4 ... LCD panel 5 ... Keyboard 6 ... Hinge unit 7 ... Antenna 11 ... Antenna substrate 12 ... Groove 13 ... Element 14 ... GND (ground)
15 ... Feeding point 20 ... Antenna mounting area 21 ... Ribs 25, 26, 27 ... Fixing member

Claims (3)

In a computer having a case made of a dielectric and having a built-in display panel ,
A plurality of protrusions provided at an upper end portion in an antenna mounting area configured on an inner surface of the case, and protruding in a direction substantially perpendicular to the inner surface at a predetermined interval from the inner surface of the case ;
It is formed of a flexible metal plate and has a substantially square shape, and is formed by providing a groove along one side of the sides constituting the substantially square shape, on the projecting side of the antenna mounting area. The display panel and the inner surface of the case are different from the region where the radiating element is positioned and spaced from the inner surface of the case between the plurality of protrusions and the region where the radiating element is formed A planar antenna having a ground positioned between and fixed to the inner surface ;
A computer comprising: In a computer having a case made of a dielectric and having a built-in display panel ,
A plurality of protrusions provided at an upper end portion in an antenna mounting area configured on the inner side surface of the case, protruding in a direction substantially perpendicular to the inner side surface from the inner side surface of the case at a predetermined interval and including a wedge shape in cross section; ,
It is formed of a flexible metal plate and has a substantially square shape, and is formed by providing a groove along one side of the sides constituting the substantially square shape, and the projecting side in the antenna mounting area And a region different from the region where the radiating element is formed and the radiating element located between the plurality of protrusions and the case inner side surface with a gap between the display panel and the case. A flat plate antenna having a ground positioned between the side surfaces;
The plate type antenna, characterized in that said radiating elements side by curved mounted so that is positioned on a plurality of projections of the antenna mounting area, implemented to secure the ground to the inside surface And computer. In a computer having a case made of a dielectric and having a built-in display panel,
  A radiating element formed by providing a groove along one of the sides forming the substantially square shape and the radiating element is formed of a flexible metal plate and having a substantially square shape. A flat antenna having a ground which is a region different from the region to be positioned and is located between the display panel and the inner surface of the case;
  A fixing member for fixing the ground to the inner side surface of the case so that the antenna is positioned substantially parallel to the inner side surface of the case at a predetermined interval;
  A plurality of protrusions provided so as to protrude from the inner side surface of the case at a predetermined interval in a direction substantially perpendicular to the inner side surface and hold the radiation element;
  A computer comprising:

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