JP3837831B2 - Electronic device having electromagnetic wave reduction structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic apparatus having a structure for reducing electromagnetic waves radiated from a display unit rotatably attached to a main body unit.
[0002]
[Prior art]
Conventionally, in an electronic device having a display unit in which a liquid crystal display device such as a word processor or a portable computer is accommodated, an electromagnetic wave is radiated from a drive circuit board of the display unit, and this is mounted as a semiconductor component of the electronic device body as unnecessary radiation. In order to prevent the main circuit board from being affected, various measures have been taken to reduce the level of electromagnetic waves.
[0003]
FIG. 3 is an external perspective view showing a portable computer, which is an electronic device having a conventional electromagnetic wave reduction structure. Reference numeral 11 denotes a main body portion in which a main circuit board (not shown) is accommodated, and reference numeral 12 denotes a hinge portion 13. This is a display unit that is pivotally attached to the unit 11 and accommodates the liquid crystal display device 14 and its drive circuit board (not shown). The housings of the main body 11 and the display unit 12 are formed of metal-plated plastic. The drive circuit board is connected to the main circuit board by a signal line 15, and a shield member 16 is wound so as to cover the signal line 15. One end of the shield member 16 is connected to a frame ground of the main body portion 11 by a fastening member (not shown) such as a screw, and the other end is connected to the frame ground of the display portion 12. Reference numeral 18 denotes a keyboard for inputting data.
[0004]
As a result, the housing of the display unit 12 is grounded to the housing of the main body unit 11 through the shield member 16, so that electromagnetic waves radiated to the outside from the display unit 12 are shielded by the housing of the display unit 12, and unnecessary radiation is generated. The level is reduced.
[0005]
[Problems to be solved by the invention]
In the portable computer having the conventional electromagnetic wave reduction structure described above, the frame ground connection between the main unit and the display unit is made with a wire, so the number of points where the main unit and the display unit are connected is small and electromagnetically unstable. Therefore, it was not sufficient to prevent the emission of electromagnetic waves from the display unit.
[0006]
An object of the present invention is to provide an electronic device having a structure in which an electromagnetically stable connection is established between a display unit and a main body unit and electromagnetic waves radiated from the display unit can be reduced.
[0007]
[Means for Solving the Problems]
In order to solve this problem, according to the present invention, a flexible electrically conductive material is disposed in a casing that is a frame ground of a main body so as to be electrically conductive, and the display unit can be rotated arbitrarily. Even in the position state, the flexible electrically conductive material is configured to come into contact with the casing which is the frame ground of the display portion in a wide range.
[0008]
Thereby, the frame ground of the display unit becomes electromagnetically stable, and an effect of reducing the level of electromagnetic waves radiated from the display unit is obtained.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The invention described in claim 1 of the present invention
The main circuit board on which semiconductor components are mounted is accommodated, and the housing is made of a material with electrical continuity, such as metal, conductive plastic, or metal-plated synthetic resin, and the exterior surface is painted. The body part made,
A liquid crystal display device and the like are housed, and the housing is formed of a material having electrical continuity such as metal, conductive plastic, or a synthetic resin plated with metal, and a display portion whose surface is painted ,
A hinge part for pivotally attaching the display part to the main body part;
The display portion has a circular arc surface that is concentric with the pivot center of the hinge portion and wide in the axial direction,
A flexible electrically conductive material is provided on either the arc surface or the upper surface of the main body facing the arc surface,
The upper surface of the main body or the circular arc surface is relatively rotated while being in contact with the electrically conductive material, and the electrically conductive material in the housing of each of the main body and the display unit is the flexible electrical material. An electronic device having an electromagnetic wave reduction structure characterized by being configured to be electrically conductive at a high frequency level through a conductive material and the electrically non-conductive coating ,
Smooth and without disturbing the opening and closing of the display portion, the main body portion and the casing which is the frame ground of the display portion can be stably brought into contact with each other in a wide range. Moreover, since it is electrically non-contact, it has the effect | action that there is no generation | occurrence | production of the noise by contact. In addition, since the body part and the display part surface are painted for makeup and the metal member is not exposed, there is no occurrence of rust and the like and the appearance is good.
[0010]
According to a second aspect of the present invention, the main body portion has an arc surface concentric with the rotation center of the hinge portion and wide in the axial direction, and either the arc surface or the lower portion of the display unit facing the arc surface. A flexible electrically conductive material is provided. Similar to claim 1, the frame of the main body and the display unit is smooth in a wide range without obstructing the opening and closing of the display unit. It has the effect | action that the housing | casing which is a ground can be made to contact stably.
[0011]
The invention according to claim 3 is composed of a flexible electrically conductive material made of a cotton cloth having electrical continuity and an elastic sponge-like synthetic resin, and prevents opening and closing of the display portion. It is smooth and has an effect that the main body and the display can be stably contacted.
[0014]
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
(Embodiment 1)
FIG. 1A is an external perspective view showing a portable computer, which is an electronic apparatus having an electromagnetic wave reduction structure according to the present invention, wherein 1 is a main body for storing a main circuit board (not shown), and 2 is a hinge. The display unit is a display unit that is rotatably attached to the main body unit 1 by the unit 3 and that accommodates the liquid crystal display device 4 and its drive circuit board (not shown). The casings of the main body 1 and the display unit 2 are made of metal-plated plastic, and the surface is painted for makeup. Further, the lower portion of the display unit 2 is a wide arc surface 2a concentric with the rotation center 3a of the hinge unit 3 as shown in FIG. 1B, and is formed on the upper surface of the main body unit 1 facing the arc surface 2a. An electrically conductive material 5 composed of a cotton cloth 5a having a metal plating and having electrical continuity and an elastic sponge 5b is attached in accordance with the width of the arc surface 2a. The drive circuit board is connected to the main circuit board by signal lines (not shown). Reference numeral 6 denotes a keyboard for inputting data.
[0015]
The operation of the electronic device configured as described above will be described below. The display unit 2 attached to the main body unit 1 so as to be rotatable by the hinge unit 3 has an arc surface 2a attached to the main body unit 1 when the display unit 2 is rotated to an angle for making the display position appropriate. Always in contact with the conductive material 5. Since the electrically conductive material 5 is composed of a cotton cloth 5a and a sponge-like elastic material 5b such as a sponge, the body portion 1 The housing which is the frame ground of the display unit 2 is stably in contact.
[0016]
As a result, the display unit 2 is brought into contact with the main body unit 1 through the electrically conductive material 5, and since the main body unit 1 and the display unit 2 are coated on the surface, they are not electrically connected to this part. However, it conducts electromagnetically at a high frequency level. For this reason, electromagnetic waves from the display unit can be prevented as a result, and unnecessary radiation can be reduced. Moreover, since they are in contact with each other over a wide range, the effect is very large compared to the conventional electromagnetic wave reducing structure. FIG. 2 shows comparison data of unnecessary radiation levels with a conventional portable computer. FIG. 2A shows a conventional example, and FIG. 2B shows this embodiment. It can be seen that the level of unwanted radiation has a large effect especially at a high frequency.
[0017]
Further, since the arc surface 2a of the display portion 2 with which the electrically conductive material 5 comes into contact is not painted and the metal surface is not exposed, no noise or rust is generated, and the appearance is not deteriorated.
[0018]
In the above description, a flexible electrically conductive material is described as an example of a woven fabric that is electrically connected to a sponge. However, any flexible conductive material may be used, for example, hollow Such a conductive rubber may be used.
[0019]
In this embodiment, the arc portion is provided on the display portion side and the electrically conductive material is provided on the main body portion side. Conversely, the arc portion is provided on the main body portion side, and the electrically conductive material is provided on the display portion side. Needless to say, it may be.
[0020]
Further, the electrically conductive material may have an arc portion, and the other side in contact may not have the arc portion.
[0021]
【The invention's effect】
As described above, according to the present invention, it is smooth without interfering with the opening and closing of the display unit, and electromagnetically stable at a high frequency level between the casings that are the frame grounds of the main body unit and the display unit in a wide range. Can be connected. Furthermore, since it is not necessary to expose the metal member, there is an advantageous effect that the appearance can be improved.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a portable computer according to an embodiment of the present invention. FIG. 2 shows comparison data of unnecessary radiation levels between a portable computer according to an embodiment of the present invention and a conventional portable computer. [Fig. 3] External perspective view of a conventional portable computer [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body part 2 Display part 2a Arc surface 3 Hinge part 5 Electrically conductive material

Claims (3)

The main circuit board on which semiconductor components are mounted is accommodated, and the housing is formed of a material with electrical continuity such as metal, conductive plastic, or metal-plated synthetic resin, and the exterior surface is painted. The body part made,
A liquid crystal display device or the like is housed, and the housing is formed of a material having electrical continuity such as metal, conductive plastic, or metal-plated synthetic resin, and a display portion whose surface is painted ,
A hinge portion for pivotally attaching the display portion to the main body portion;
The display portion has a circular arc surface that is concentric with the pivot center of the hinge portion and is wide in the axial direction,
A flexible electrically conductive material is provided on either the arc surface or the upper surface of the main body portion facing the arc surface,
The upper surface of the main body or the arcuate surface is relatively rotated while being in contact with the electrically conductive material, and the electrically conductive material in the housing of each of the main body and the display is electrically An electronic apparatus having an electromagnetic wave reduction structure characterized in that it is electrically conductive at a high frequency level through a conductive material and the electrically non-conductive paint . The arcuate surface of the wide axially rotational center concentric with the hinge portion has a main body portion, electrically conductive Flexible on one of the display subordinate unit facing the arcuate surface or the circular arc surface 2. An electronic apparatus having an electromagnetic wave reducing structure according to claim 1, wherein a material is provided. 3. The electromagnetic wave reducing structure according to claim 1, wherein the flexible electrically conductive material is composed of a cotton cloth having electrical continuity and an elastic sponge-like synthetic resin. Electronic equipment having

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