JPH10178293A - Computer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a computer system in which each unit of the computer system is provided with an electromagnetic shield for preventing leakage and intrusion of electromagnetic waves. SOLUTION: A conductive layer is provided for the housing of a computer body 3, a display 5, a keyboard 7, a removable disc drive 9, a printer 11, etc. The keyboard 7 is applied with a keyboard cover made of polyethylene dispersed with microparticles of ferrite exhibiting an electromagnetic shield effect. A connection cable 30 comprises the conductor at a cable part and the conductor at a connector part for shielding a signal line 38 from electromagnetic waves. According to the structure, electronic devices in the housing of a computer system 1 and the connection cable 30 are shielded from electromagnetic waves by an electromagnetic shield means provided at each part without exception.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a computer system provided with an electromagnetic wave shield.

[0002]

2. Description of the Related Art
As a case of a computer or the like, a case formed of plastic is often used. In order to shield electromagnetic waves from entering and exiting the electronic components installed inside the housing, a conductive paint is applied to the surface of the plastic housing, or a conductive thin film is formed by metal spraying, metal evaporation, or electroless plating. Forming an electromagnetic wave shielding layer,
Alternatively, an electromagnetic wave shielding performance is provided by mounting a conductive metal plate or the like.

[0003] In recent years, offices have provided many computer systems provided with the above-described electromagnetic wave shielding layer. However, in these computer systems, although an electromagnetic wave shielding layer is provided for each device, electromagnetic waves may still leak or enter. On the other hand, an office may be provided with a booth surrounding each of the computer systems, but this does not keep the office design.

Accordingly, an object of the present invention is to provide a computer system provided with an electromagnetic wave shield for shielding an electromagnetic wave leaking or invading in a computer system unit.

[0005]

Means for Solving the Problems, Embodiments of the Invention, and Effects of the Invention A computer system according to the present invention, which has been made to achieve the above object, connects at least a computer main body, a display, a keyboard, and these devices. In a computer system comprising a connection cable, a computer shield means for electromagnetically shielding the computer body alone, a display shield means for electromagnetically shielding the display alone, and a keyboard shield means for electromagnetically shielding the keyboard alone. And a cable shielding means for shielding the connection cable as an electromagnetic wave by itself,
The whole system is shielded from electromagnetic waves by electrically connecting the respective shield means to each other.

According to the first aspect of the present invention, at least an electromagnetic wave that enters and exits a computer main body, a display, and a keyboard and a connection cable for connecting these devices (hereinafter, sometimes referred to as system components) is transmitted to the system components. And shielded by electromagnetic wave shielding means provided on the connection cable. Further, each electromagnetic wave shielding means of the computer system is electrically connected, and always shields electromagnetic waves entering and exiting the entire system. Therefore,
According to the computer system of the present invention, the electromagnetic waves entering and exiting the computer system are always shielded, so that the effects of invasion of the electromagnetic waves on internal components and the like and leakage of the electromagnetic waves are significantly reduced as compared with the conventional computer system. is there. Further, the electromagnetic wave shielding effect may be further enhanced by adding a ground to the electromagnetic wave shielding means of each of the system components and the connection cable.

The electromagnetic wave shielding means of the system components of the computer system and the connection cable of the present invention may have the following configurations. That is, as described in claim 2, in the computer system according to claim 1, the computer shield means is provided with a conductive layer continuous in a casing of the computer main body so as to enclose components such as an internal CPU. The display shield means is provided with a transparent conductive film on a front glass of the display, and a continuous conductive film wrapping a component such as a cathode-ray tube inside a display housing mounted with the front glass. A layer, and a conductive layer of the display housing and a transparent conductive film of the front glass are electrically connected to each other, and the keyboard shield means is configured such that a top surface of the keyboard is formed of a flexible material. By covering the keyboard cover with a conductive layer. Configured, the cable shield means, said connecting cable, may be configured by creating with the conductive layer so as to surround the whole including the connector portion.

According to the computer system, various parts in the housing of the system component equipment and electromagnetic waves entering and exiting the signal line of the connection cable are shielded by the electromagnetic wave shielding means provided so as to be suitable for the system component equipment and the connection cable. Be sure to shield. Therefore, according to the computer system, since the electromagnetic waves entering and exiting the computer system are always shielded, there is an effect that the influence of the invasion of the electromagnetic waves on the internal components and the leakage of the electromagnetic waves are significantly reduced as compared with the conventional computer system. . Further, the electromagnetic wave shielding effect may be further enhanced by adding a ground to the electromagnetic wave shielding means of each of the system components and the connection cable.

The following configuration can be used as a configuration in which the electromagnetic wave shielding means of the connection cable electrically connects the electromagnetic wave shielding means of the system component equipment.
That is, as described in claim 3, in the computer system according to claim 2, the device including a connector portion for detachably connecting the connection cable includes the conductive layer provided in each device in the connector portion and the electrical connection. When the connection cable is connected, a conductive layer surrounding the connector part on the cable side and the conductive connector receiver are brought into contact with each other to connect the conductive layer of each device to the conductive layer. Preferably, the conductive layer of the cable is electrically continuous.

According to the computer system, also in the connection cable connecting the system components, the cable portion of the connection cable is shielded from electromagnetic waves, and the conductive layer surrounding the connector of the connection cable and the connector receptacle of the system components are connected. And shields incoming and outgoing electromagnetic waves without fail. Therefore, according to the computer system, since the electromagnetic waves entering and exiting the computer system are always shielded, there is an effect that the influence of the invasion of the electromagnetic waves on the internal components and the leakage of the electromagnetic waves are significantly reduced as compared with the conventional computer system. . Also,
The electromagnetic wave shielding effect may be further enhanced by adding a ground to the electromagnetic wave shielding means of each of the system components and the connection cable.

The electromagnetic wave shielding means of the keyboard cover may be configured as follows. That is, as described in claim 4, in the computer system according to any one of claims 2 and 3, the keyboard cover is formed by dispersing and mixing ultra-fine particles of a conductive material in a transparent flexible resin. It is good to be formed with a thing and to be detachable with respect to the keyboard upper surface.

The keyboard cover is formed of a transparent flexible resin. Therefore, the key arrangement of the keyboard can be viewed from above the keyboard cover, and typing can be performed. Further, ultrafine particles are dispersed and mixed in a transparent flexible resin. Therefore, there is an effect that it is possible to shield electromagnetic waves that enter and exit the keyboard. In the present invention, the ultrafine particles have a particle diameter of 1 μm.
The following are used, but more preferably the particle size is 0.1
Those having a size of μm or less are used. The material of the ultrafine particles is not particularly limited as long as it has an electromagnetic wave shielding effect, and examples thereof include metals such as Al, Fe, Co, Ni, and Cu, ferrite, carbon black, and far-infrared ceramics. .

[0013]

The means for solving the above-mentioned problems of the present invention,
A computer system 1 according to an embodiment of the present invention will be described in order to further clarify the embodiments and effects of the present invention.

As shown in FIG. 1A which is a perspective view or FIG. 1B which is a block diagram, the computer system 1 mainly includes a computer main body 3, a display 5, a keyboard 7, a removable disk drive 9, a printer 11 and the like. , Mouse 13 and interconnecting cable 3
0 is connected.

FIG. 2A is a schematic view of a cross section of the housing 15 of the electromagnetic wave shielding means of the computer main body 3. The housing 15 of the computer main body 3 is formed of plastic. The first conductive metal plate 20 is provided inside the housing 15, and the second conductive metal plate 21 is provided inside the first conductive metal plate 20.

The first conductive metal plate 20 is formed so as to extend along the inner surface of the housing 15, and the second conductive metal plate 21 is formed so as to spread along the inner surface of the first conductive metal plate 20. Have been. Further, the first conductive metal plate 20 and the second conductive metal plate 21 are 3 mm or less (preferably 1 mm or less).
The spacer 18 is inserted so as to leave an interval.

The housing 15 and the first conductive metal plate 20
, The spacer 18 and the second conductive metal plate 21 are formed with concentric through-holes, and are fixed by fixtures 19 attached to the through-holes. Note that the fixing device 19 is the same as that shown in FIG.
In (a), although only one is shown, it is assumed that it is appropriately arranged at a portion indicated by a chain line.

The fixture 19 is, as shown in FIG.
It is composed of a bolt 19a and a nut 19b. In addition,
When the fixing device 19 is fixed as described above, the washer 1 is used to prevent the housing 15 and the second conductive metal plate 20 from being damaged.
9c. The housing 15 of the computer body 3
As shown in FIG. 3 which is a schematic view of the end face of the back surface, an opening 15a is provided in the back surface of the back surface, and the first conductive metal plate 20 and the second conductive metal plate 21 are similarly opened. A back panel 33 made of a conductive metal is attached from the inside of the housing 15 along the opening 15a. Also, a through-hole 33a formed in the back panel 33
Is provided with a connector receiving portion 35 formed of a conductive metal to which a connector portion 30b of the connection cable 30 described later can be attached. And the rear panel 33
Has an end face bonded to the first conductive metal plate 20 and the second conductive metal plate 21, and a metal mesh 34 is placed over the bonded portion to shield electromagnetic waves coming in and out of the bonded portion. Further, the metal mesh 34 includes the first conductive metal plate 20 and the second conductive metal plate 21 and the back panel 3.
And 3 is electrically coupled.

The casing (not shown) of the printer 11 is also composed of a casing having a first conductive metal plate and a second conductive metal plate, like the casing 15 of the computer main body 3. A rear panel is provided on the rear surface of the printer 11 as in the case 15.

The electromagnetic wave shielding means of a removable disk drive 9 such as an MO disk drive (hereinafter, also referred to as an RD drive 9), as shown in FIG.
A thickness of 1 is applied to the inner surface of the housing 43 made of plastic.
A conductive thin film 45 containing copper of about 0 μm as a component is electrolessly plated. Also, the back of the RD drive 9
Similarly to the case 15 of the computer main body 3, an opening 43a is provided on the back surface of the case 43, and a conductive metal back panel 33 is attached from inside the case 43. A through hole 33a is formed in the rear panel 33, and a connector receiving portion 35 is provided so that a connector portion 30b of the connection cable 30 described later can be attached.

Also, the housing (not shown) of the mouse 13
Similarly to the RD drive 9, a conductive thin film is electrolessly plated on the inner surface. The connection cable 30 connects the computer body 3 and various peripheral devices to each other. The schematic diagram of the end face in FIG. 3 shows a state where the computer main body 3 and the RD drive 9 are connected by the connection cable 30. The connection cable 30 includes a cable section 30a and a connector section 30b.

The cable section 30a is surrounded by an insulator 36 such as an ethylene propylene rubber centering on a signal line 38 for transmitting and receiving signals. And insulator 3
6 is surrounded by a conductor 39 serving as an electromagnetic shield layer.
Further, the conductor 39 has a structure in which an outer cover 36 made of an insulator such as ethylene propylene rubber surrounds the conductor 39. The connector portion 30b is surrounded by a plastic insulator 36 around a signal line 38 for transmitting and receiving signals. Then, the insulator 36 is connected to the conductor 3 serving as an electromagnetic shield layer.
7 are around. Further, the conductor 39 has a structure in which the outer shell 31 of a plastic insulator surrounds the conductor 39. The connector surface of the connector 36 between the insulator 36 and the conductor 37 is formed in a shape that can be connected to the connector receiving portion 35 such as the housing 15 of the computer main body 3. Further, the connection cable 30 of FIG. 3 has only one signal line for transmitting and receiving signals, but the actual connection cable 30 has many signal lines for transmitting and receiving signals.

FIG. 4 is a schematic view of an end face of the electromagnetic shield structure of the display 5. The housing 5a of the display 5
Made of plastic. Then, like the case 15 of the computer main body 3, the first surface is placed on the inner surface of the case 5a.
A conductive metal plate 20 and a second conductive metal plate 21 are provided, and a spacer 18 is provided between the first conductive metal plate 20 and the second conductive metal plate 21. Further, a front glass 6a is attached to the rear surface of the front portion 5b of the housing 5a. Further, C on the back surface of the front glass 6a
A transparent conductive film 6b of a conductive In2O3 film is formed using VD processing. A transparent conductive film 6b;
A metal mesh 6c is placed over the joint between the first conductive metal plate 20 and the second conductive metal plate 21. The cathode ray tube 4 is attached to the inside of the housing 5a with an insulating fixture (not shown). A rear panel is provided on the rear surface of the housing 5a, as in the case of the housing 15.

As shown in FIG. 5A, the keyboard 7 is provided with a front surface 7a and a keyboard cover 8 that covers keys 7b provided on the front surface 7a. The keyboard cover 8 is shown in FIG. 5B, which is a cross section AA in FIG.
As shown in FIG. 5, a resin such as polyethylene in which ultrafine ferrite particles having an electromagnetic wave shielding effect are uniformly mixed and dispersed is formed thin so as to cover the surface 7a and the keys 7b of the keyboard 7. The ferrite ultrafine particles have a particle size of about 0.1 to 1 μm, and are mixed and diffused in polystyrene at a ratio of 20 to 60% by weight.

A connection cable 30 for connecting the keyboard 7 and the computer body 3 is attached to the keyboard 7 on the left side in FIG. The keyboard cover 8 is provided with a recess 8a so as to match the shape of the conductor 37 of the connector 30b on the keyboard 7 side of the connection cable 30.

Further, a gap is inevitably formed in an opening / closing portion of a housing such as a maintenance door (not shown) of the printer 11. Therefore, as shown in FIG. 6C, the electromagnetic wave shielding material 23 was attached as a gasket to the door 29a and the housing 29b of the opening / closing section of the housing.

As shown in FIG. 6 (a) or (b), the electromagnetic wave shielding member 23 is provided with a stitch projection 27 made of an elastomer on the upper surface of a conductive sheet member 24, and each stitch is formed. The loop 28 of the conductive fiber is erected closely. Note that an adhesive 25 is provided on the lower surface of the sheet material 24.
And a layer of release paper 26 are provided. This electromagnetic wave shielding material 23 is cut into a desired size, the release paper 26 is peeled off, and as shown in FIG.
Use by sticking to each other. The height of the stitch 27 made of elastomer is shown in FIG.
As shown in (a), the height of the loop 28 is about half. Therefore, as shown in FIG. 6C, the loop 28 is in contact with and conducts without being crushed, and exhibits an electromagnetic wave shielding effect. Further, the hermeticity of the gasket is achieved by the close contact between the stitch-like projections 27.

The sheet material 24 may be made of a synthetic fiber woven fabric (for example, a woven fabric of polyamide, polyester, polypropylene, acrylic, aramid, glass fiber, etc.) or a soft synthetic resin (for example, soft vinyl chloride, polyurethane, silicone rubber, or the like). Chloroprene rubber, thermoplastic elastomer, etc.), and the surface thereof is subjected to conductive plating with Ag, Ni, Cu, or the like. The fibers forming the loop 13 include Ag, Ni, Cu on the surface of synthetic fibers (for example, polyamide, acrylic, aramid, polyethylene terephthalate, polyurethane, polypropylene, etc.).
Uses one that has been subjected to conductive plating such as

As the elastomer constituting the stitch-like projection 27, a gel-like substance having a high deformability and used as a cushioning material is used. The operation and effect of the computer system 1 of the present invention described above will be described. The casings of the removable disk drive 9 and the mouse 13 are electrolessly plated with a conductive thin film of about 10 μm on the inner surface to shield electromagnetic waves from entering and exiting electronic components inside the casing.

In the housing of the computer main body 3, the display 5 and the printer 11, an intruding electromagnetic wave is first shielded by the first conductive metal plate 20. Then, the electromagnetic wave transmitted through the first conductive metal plate 20 is applied to the first conductive metal plate 2.
It is diffused and weakened between the zero and the second conductive metal plate 21. Further, the weakened electromagnetic wave is transmitted to the second conductive metal plate 2.
Shielded at 1. Therefore, providing a double conductive metal plate,
The space between the two conductive metal plates shields electromagnetic waves from entering the electronic components inside the housing more than when only one conductive metal plate is provided and when the conductive thin film is electrolessly plated. The effect is excellent. The electromagnetic waves leaked from the electronic components inside the housing are transmitted to the second conductive metal plate 2.
1. The space between the first conductive metal plate 20 and the second conductive metal plate 21 is shielded while the light passes through the first conductive metal plate 20 in this order.

However, in the case of the RD drive 9 and the mouse 13 which have a relatively small volume and it is difficult to provide a double conductive metal plate, the conductive thin film is formed by electroless plating as in this embodiment. It is preferable to do this. Further, in the display 5, the conductive I is provided on the back surface of the front glass 6a.
A transparent conductive film 6b of an n2O3 film is formed, and shields electromagnetic waves entering and exiting components such as a cathode ray tube. Also,
When the electromagnetic wave is strong and easily penetrates the transparent conductive film 6b, the thickness of the transparent conductive film 6b may be increased.

The keyboard 7 is covered with a keyboard cover 8 made of polyethylene or the like in which ultrafine ferrite particles having an extremely small particle size and having an electromagnetic wave shielding effect are dispersed, and electromagnetic waves entering and exiting electronic components inside the keyboard 7 are provided. Shield. In addition, polyethylene has sufficient original elasticity (that is, restoring force against tension and compression), and the key 7b
Can be typed.

In the connection cable 30, the conductor 39 of the cable section 30a and the conductor 37 of the connector section 30b shield the electromagnetic waves entering and exiting the signal line 38. As described above, the computer system 1 is provided with the electromagnetic wave shielding means so as to be suitable for each device and the connection cable 30, and each electromagnetic wave shielding means is provided with:
It is electrically coupled so as to surround all the devices and the connection cable 30. Therefore, there is an effect that the electromagnetic wave entering and exiting the electronic components and the connection cable 30 inside the housing of the computer system 1 is shielded by the electromagnetic wave shielding means provided without leakage at any place.

Although one embodiment of the present invention has been described, the present invention is not limited to this, and can be implemented in various other modes. The computer body 3 of the present embodiment,
The electromagnetic wave shielding means of the display 5 and the casing of the printer 11 is constituted by a first conductive metal plate 20 and a second conductive metal plate 21. Electromagnetic wave shielding means in which the conductive thin film 45 serving as a shield layer is electrolessly plated may be used.

The connection cable 30 is obtained by electroless plating a conductive thin film 45 on the outer shell 31 and the outer shell 41 instead of providing the conductors 37 and 39 serving as electromagnetic wave shields inside the outer shell 31 and the outer shell 41. Good. As the plastic forming the housing of the embodiment of the present invention, an ABS resin or the like can be used, but a thermoplastic resin such as polyethylene, polyvinyl chloride, polystyrene, polypropylene, nylon, polycarbonate, or polyoxymethylene can be used. Good. Alternatively, when plastic deformation of the material is not used in the processing of the plastic material, a phenolic resin, a urea resin, a melamine resin, a thermally effective resin such as an epoxy resin, or a cellulose resin,
A reinforced plastic to which a glass resin or the like is added may be used.

In addition to the plastic housing, a housing made of another material such as wood or paper through which electromagnetic waves pass may be used. In addition, if a housing made of a conductive material is used, the electromagnetic wave shielding effect can be further enhanced. The transparent conductive film 6b according to the embodiment of the present invention has the conductive I
Although an n2O3 film was used, conductive SnO2
A transparent conductive film such as a film, a conductive ZnO film, or an Ag film may be used.

The front glass 6a of the embodiment of the present invention may be made of a transparent plastic material. The keyboard cover 8 of the embodiment of the present invention is formed of a resin such as polyethylene in which ultrafine ferrite particles are dispersed. However, other ultrafine particles may have an electromagnetic wave shielding effect. Metals such as Fe, Co, Ni, and Cu, carbon black, and far-infrared ceramics may be used. The polyethylene resin may be another resin such as another hydrocarbon resin (polypropylene, polystyrene, etc.), a halogen-containing resin (polyvinyl chloride, polyvinylidene chloride, etc.), an acrylic resin, vinyl acetate. A synthetic resin such as a resin, a polyester resin, a polyamide resin, a polyether resin, an epoxy resin, and a silicon resin may be used.

Although the conductive thin film 45 of the embodiment of the present invention is formed by electroless plating, it may be formed by, for example, metal spraying or metal evaporation. The conductive thin film 4
Instead of 5, a conductive paint may be applied. The electromagnetic wave shielding effect may be further enhanced by adding an earth to the electromagnetic wave shielding means of each device and the connection cable 30 of the embodiment of the present invention.

[Brief description of the drawings]

FIG. 1 shows a computer system 1 according to an embodiment.
(A) is a perspective view, and (b) is a block diagram.

FIGS. 2A and 2B are cross-sectional views of a housing 15 of the computer main body 3 of the embodiment, wherein FIG. 2A is a schematic perspective view, and FIG. 2B is an enlarged view of a fixture 19 attached to the housing 15.

FIG. 3 is a schematic diagram illustrating a vertical end surface of a connection cable 30 according to the embodiment and a rear surface of a housing 15 of the computer main body 3 and a housing 43 of the RD drive 9;

FIG. 4 is a schematic diagram illustrating a vertical end surface of an upper portion of a display 5 according to the embodiment.

5A and 5B show a keyboard 7 and a keyboard cover 8 according to the embodiment, wherein FIG. 5A is a perspective view, and FIG.
FIG.

FIG. 6 shows an electromagnetic wave shielding material 23 of the embodiment,
(A) is a longitudinal sectional view, (b) is a plan view, and (c) is a sectional view in a used state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Computer system, 3 ... Computer main body, 5 ... Display, 5a ... Housing, 6a ...
..Front glass, 6b ... transparent conductive film, 7 ...
Keyboard, 8: Keyboard cover, 9: Removable disk drive, 11: Printer, 13
... Mouse, 17 ... Case, 20 ... First conductive metal plate, 21 ... Second conductive metal plate, 23 ... Electromagnetic shielding material, 30 ... Connection cable, 33 ... back panel, 35 ... connector receiving part, 37 ... conductor, 39 ... conductor, 43 ... housing, 45 ... conductive thin film

Claims (4)

[Claims] 1. A computer system comprising at least a computer main body, a display and a keyboard, and a connection cable for connecting these devices, a computer shield means for shielding said computer main body by itself, and an electromagnetic wave by said display alone. A display shield means for shielding, a keyboard shield means for shielding the keyboard by electromagnetic waves by itself, and a cable shield means for shielding the connection cable by electromagnetic waves by itself, and by electrically connecting the shield means to each other. A computer system characterized in that the entire system is shielded from electromagnetic waves. 2. The computer system according to claim 1, wherein said computer shield means is provided by providing a continuous conductive layer in a casing of said computer main body so as to enclose components such as an internal CPU. The display shield means is provided with a transparent conductive film on a front glass of the display, and a display housing equipped with the front glass is provided with a continuous conductive layer so as to enclose components such as a cathode-ray tube therein. It is constituted by electrically connecting a conductive layer of a display housing and a transparent conductive film of the front glass, and covers the keyboard shield means with a keyboard cover formed of a flexible material on a top surface of the keyboard. And a conductive layer provided on the keyboard cover. Computer system characterized in that the table shielding means, said connecting cable, constituted by equip the conductive layer so as to surround the whole including the connector portion. 3. The computer system according to claim 2, wherein the device having a connector portion for detachably connecting the connection cable includes a conductive portion electrically connected to the conductive layer of each device at the connector portion. When the connection cable is connected, the conductive layer surrounding the cable-side connector portion and the conductive connector receiver are brought into contact with each other, whereby the conductive layer of each device and the conductive layer of the connection cable are connected. A computer system characterized by being electrically continuous. 4. The computer system according to claim 2, wherein the keyboard cover is formed by dispersing and mixing ultra-fine particles of a conductive material in a transparent flexible resin. A computer system, which is detachable from an upper surface.