JP2009026824A - Electronic appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic appliance which can reduce by its space smaller than conventional ones the effect given to its wires by radio waves radiated from the periphery of its wires. <P>SOLUTION: In the electronic appliance, a harness 18 is so kept away from an electronic component 15 by a rail member 19 as not to be induced with radio waves radiated from the electronic component 15. The rail member 19 is connected electrically with the ground of a circuit board 13 via screws 12. The rail member 19 so has an installing portion 19d for installing thereon the harness 18 as to mount the harness 18 on a recessed portion 19g along a side-wall 19f of the rail member 19. In the rail member 19, wall portions 19b are so formed as to separate the recessed portion 19g for mounting thereon the harness 18 from a top surface 13a of the circuit board 13. By adopting such a structure, the effect given to the harness by the radio waves radiated from the electronic component can be reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic device, and more particularly to a shield structure.

  With miniaturization and high integration of electronic devices, countermeasures against electromagnetic wave noise generated from the inside of electronic devices are becoming increasingly important. Radiated electromagnetic noise may lead to malfunctions of peripheral devices such as wireless devices and malfunctions of the devices themselves that generate noise. As a countermeasure against electromagnetic wave noise, one method is to use a metal such as iron or aluminum for the casing to shield electromagnetic waves emitted from electronic devices. Since portable electronic devices such as notebook computers are required to be lighter, a conductive layer is provided on a resin casing by metal plating, and an electromagnetic wave shielding layer may be formed.

Patent Document 1 discloses a wiring duct in which a cover is engaged with a rail formed on a substrate surface and an electromagnetic wave shielding material is attached to the inner surface for the purpose of preventing noise from being superimposed on a signal transmitted to an electric wire. It is disclosed.
Japanese Patent Laid-Open No. 10-66220

  However, in the case of the above-described method, there is a problem that a large space is required to surround the electric wire with a wiring duct, which hinders improvement in mounting density of electronic devices.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic device that can reduce the influence of electric waves emitted from the surroundings on electric wires in a smaller space.

  In order to achieve the above object, an electronic apparatus according to the present invention is connected to a housing, a circuit board on which electronic components that generate noise are mounted, and a connector provided on the circuit board. And a rail member that has conductivity and is provided on the circuit board so as to cover the electronic component, the rail member on the surface opposite to the lower surface that covers the electronic component. It has the erection part for erection.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic device which can reduce the influence which the electromagnetic wave emitted from the periphery with less space has on an electric wire can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an external perspective view showing an electronic apparatus according to an embodiment of the present invention. The electronic device 1 includes a housing 2, and a display unit 3 is rotatably attached to the housing 2 via a hinge portion 4. The display unit 3 is rotatable between an open position where the upper surface 2a of the housing 2 is opened and a closed position where the upper surface 2a of the housing 2 is covered. A display device including an LCD (Liquid Crystal Display) 5 is incorporated in the display unit 3. A circuit board on which a plurality of electronic components are mounted is accommodated in the housing 2. A touch pad 6 and a keyboard 7 are attached to the upper surface 2 a of the housing 2. The housing 2 is composed of an upper case 8 and a lower case 9 made of a resin or a metal such as magnesium alloy, and a circuit board (described later) on which a plurality of electronic components are mounted is accommodated in the housing 2.

  FIG. 2 is a cross-sectional view showing the inside of the electronic apparatus according to the embodiment of the present invention. FIG. 3 is a perspective view showing a circuit board built in the electronic apparatus according to the embodiment of the present invention. 4 shows a rail member according to an embodiment of the present invention as viewed from the direction of arrow A in FIG. The inner surface 8a of the upper case 8 is plated as necessary.

  A plurality of bosses 11 are provided on the inner surface 9 a of the lower case 9. A screw hole (not shown) is provided in the circuit board 13, and the lower case 9 and the circuit board 13 are screwed by the screw 12 through the boss 11. An electronic component 15 is mounted on the circuit board 13. The electronic component 15 typified by a memory, a clock generator, a switching power supply circuit and the like emits radio waves to the surroundings and becomes a noise source. The circuit board 13 is provided with a connector 16, and a terminal provided at the end 18 a of the harness 18 is connected to the connector 16 on the circuit board 13. The harness 18 is a bundle of signal lines, ground lines, power lines, and the like, and is used for speaker cables, HDD (Hard Disc Drive) cables, LAN cables, and the like.

  The rail member 19 is made of a conductive material so as to exhibit a shielding effect. A metal member or a rail member made of resin may be plated. The rail member 19 keeps the electronic component 15 and the harness 18 away so that radio waves emitted from the electronic component 15 do not transfer to the harness 18. The rail member 19 is fixed to the circuit board 13 through a screw hole (not shown) provided in the leg portion 19a. The rail member 19 is electrically connected to the ground of the circuit board 13 via the screw 12. The rail member 19 is separated from the upper surface 13a of the circuit board 13 by the height of the wall portion 19b together with the lower surface 19c of the rail member 19 together with the wall portion 19b rising from the leg portion 19a. The rail member 19 has an installation part 19d for installing the harness 18. The installation portion 19 d is provided on the surface opposite to the lower surface 19 c that covers the electronic component 15 on the circuit board 13. The installation part 19d is provided with an upper surface 19e, a side wall 19f, and a recess 19g, and the harness 18 is placed along the side wall 19f of the rail member 19 in the recess 19g. The rail member 19 is formed with a wall portion 19b so that the upper surface 13a of the circuit board 13 and the concave portion 19g on which the harness 18 is placed are separated.

  By adopting such a structure, it is possible to reduce the influence of radio waves emitted from the electronic component on the harness. Further, in order to increase the shielding effect, the harness 18 itself may be plated.

  FIG. 5 is a perspective view showing a circuit board built in an electronic apparatus according to the second embodiment of the present invention. FIG. 6 shows a rail member according to the second embodiment of the present invention as viewed from the direction of arrow B in FIG. In the following description, the same components as those shown in FIGS. 1 to 4 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 5, after the inner surface 8a of the upper case 8 of the housing 2 is plated, the rail member 19 and the upper case 8 can be brought into contact with each other via the gasket 41 so as to be electrically connected. . The inner surface 8 a of the upper case 8 is in contact with the upper surface 41 a of the gasket 41, and the upper surface 19 d of the rail member 19 is in contact with the lower surface 41 b of the gasket 41. The rail member 19 is shielded by being electrically connected to the plated housing 2, and the radio wave emitted from the electronic component 15 can be prevented from moving to the harness 18.

  Also in this case, the influence of the radio wave emitted from the electronic component 15 on the harness 18 can be reduced by moving the harness 18 away from the electronic component 15.

  FIG. 7 is a perspective view showing a circuit board built in an electronic apparatus according to the third embodiment of the present invention. In the electronic device according to the third embodiment, the rail member 30 is employed. The rail member 30 is fixed to the circuit board 13 and is electrically connected to the ground of the circuit board 13. The rail member 30 has an installation part 30d for installing the harness 18. The installation portion 30d is provided with an upper surface 30e, a side wall 30f, and a recess 30g, and the harness 18 is placed along the side wall 30f of the rail member 30 in the recess 30g. The rail member 30 is formed such that the upper surface 13a of the circuit board 13 and the recess 30g on which the harness 18 is placed are separated.

  A memory slot 31 is provided on the upper surface 13 a of the circuit board 13, and a memory module 32 is inserted into the memory slot 31. Various electronic components are mounted on the circuit board 13, and some components such as the memory slot 31 have relatively high dimensions. It is desirable to avoid routing the harness 18 across parts such as the memory slot 31 because the overall height of the circuit board 13 is increased. In addition, the rail member 30 for laying the harness 18 may not be provided in a straight line due to a requirement in component layout. In such a case, as shown in FIG. 7, by providing the bent portion 33 in a part of the rail member 30, the rail member 30 can be installed and the harness 18 can be routed so as to avoid the memory slot 31. The harness 18 is placed in the recess 30 g along the side wall 30 f of the rail member 30. Further, the harness 18 is pressed by the pressing member 34.

  By adopting the structure as shown in FIG. 7, the degree of freedom in design such as component layout is increased. Also in this case, the influence of the radio wave emitted from the electronic component 15 on the harness 18 can be reduced by moving the harness 18 away from the electronic component 15.

  As described above, according to each embodiment of the present invention, it is possible to provide an electronic device capable of reducing the influence of radio waves emitted from the surroundings on the electric wire in a smaller space.

  The present invention is not limited to the above embodiment as long as it does not depart from the gist of the present invention, and various modifications are possible.

1 is an external perspective view showing an electronic apparatus according to an embodiment of the present invention. Sectional drawing which shows the inside of the electronic device which concerns on embodiment of this invention. The perspective view which shows the circuit board incorporated in the electronic device which concerns on embodiment of this invention. The figure which looked at the rail member which concerns on embodiment of this invention from the direction of arrow A of FIG. The perspective view which shows the circuit board built in the electronic device which concerns on the 2nd Embodiment of this invention. The figure which looked at the rail member which concerns on the 2nd Embodiment of this invention from the direction of arrow B of FIG. The perspective view which shows the circuit board incorporated in the electronic device which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electronic device, 2 ... Housing | casing, 3 ... Display unit, 4 ... Hinge part, 8 ... Upper case, 9 ... Lower case, 13 ... Circuit board, 15 ... Electronic component, 16 ... Connector, 18 ... Harness, 19 ... Rail member, 19a ... Leg part, 19b ... Wall part, 19c ... Lower surface, 19d ... Installation part, 19e ... Upper surface, 19f ... Side wall, 19g ... Recess, 30 ... Rail member, 31 ... Memory slot, 32 ... Memory module, 33 ... Bent part, 34 ... Presser member, 41 ... Gasket

Claims (5)

A housing,
A circuit board that is provided in the housing and on which electronic components that generate noise are mounted;
A harness connected to a connector provided on the circuit board;
A rail member provided on the circuit board so as to cover the electronic component while having conductivity, and
The rail device has an erection part for erection of the harness on a surface opposite to a lower surface that covers the electronic component.   The electronic device according to claim 1, wherein the rail member includes a leg portion having a screw hole screwed to the circuit board, and the rail member is electrically connected to a ground of the circuit board at a screwing position.   The electronic device according to claim 1, wherein the rail member has a recess in the installation portion, and the harness is provided along the recess and includes a pressing member that holds the harness.   The electronic device according to claim 1, wherein a conductive surface is provided on an upper surface of the rail member, and the conductive surface is in contact with a conductive layer formed inside the housing.   A component having a height higher than that of the rail member is mounted on the circuit board in the vicinity of the region where the rail member is provided, and the rail member is formed so as to avoid the component. The electronic device according to claim 1.

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