JP2501379Y2 - Electromagnetic shield filter - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention is mounted on the front surface of a display screen of a display device (for example, CRT) such as an electronic device,
The present invention relates to an electromagnetic wave shield filter that shields electromagnetic waves emitted from the screen.

[0002]

2. Description of the Related Art Conventionally, there has been an electromagnetic shield plate as disclosed in Japanese Utility Model Publication No. 2-65400. In such an electromagnetic shield plate, a conductive net and a plate made of synthetic resin are integrally formed as a carrier, and a grounding terminal is provided at an end of the shield plate to connect a ground wire. Then, by electrically connecting the terminal and the conductive net, the conductive net is grounded so that the conductive net is not charged by the electromagnetic waves emitted from the CRT screen or the like.

[0003]

However, in such a conventional electromagnetic shield plate, the ground wire is connected to the terminal of the shield plate as a means for preventing the conductive net, and thus the shield plate, from being charged with static electricity. Since this method is used, it is necessary to particularly provide a terminal for connecting the ground wire. Further, since the ground wire is connected, the place where the electromagnetic shield plate is arranged is restricted.

Further, if the earth line is connected to the electromagnetic shield plate, it may be pulled by mistake, and if it is pulled by mistake, other wiring and OA equipment may be damaged. Therefore, the present invention has been devised for the purpose of providing an electromagnetic wave shielding filter capable of preventing the electrically conductive sheet from being charged by static electricity without providing such a ground wire.

[0005]

The structure of the present invention for solving the above-mentioned problems is an electromagnetic wave shielding filter which is arranged in front of a screen of a display device which emits electromagnetic waves and shields the electromagnetic waves. An annular frame body provided with a concave portion, an electromagnetic wave shielding sheet formed of a conductive material in a net shape, and conductive short fibers around, and fitted into the concave portion of the frame body to form the concave portion. An electromagnetic wave shield filter, comprising: a pressing member that holds the sheet between them.

[0006]

In the electromagnetic wave shielding filter according to the present invention, the pressing member holds the electromagnetic wave shielding sheet between the pressing member and the concave portion of the frame, so that the sheet is formed in the concave portion. It is electrically connected to the conductive short fibers around the holding member. Therefore, due to the electromagnetic waves emitted from the screen of the CRT or the like, the electric charges generated in the electromagnetic wave shielding sheet are discharged into the air through the conductive short fibers electrically connected to the sheet. Therefore, according to the present invention, it is possible to prevent the conductive sheet from being charged by static electricity without providing a ground wire.

Further, in the present invention, the mesh-like sheet is attached to the frame body to complete the electromagnetic wave shielding filter by a simple operation of fitting the pressing member into the concave portion of the frame body on which the electromagnetic wave shielding sheet is placed. be able to. The electromagnetic wave shielding filter thus completed is
The frame body and the mesh sheet can be easily separated only by taking out the pressing member from the recess. Therefore, in the electromagnetic wave shielding filter according to the present invention, the frame body and the sheet can be easily attached and detached, and the mesh sheet can be repaired or replaced,
Alternatively, cleaning or the like can be easily performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiments and includes all embodiments that can be conceived by those skilled in the art without departing from the scope of the present invention.

As shown in FIGS. 1 to 3, an electromagnetic wave shielding filter 10 of the present embodiment, which is disposed on the front surface of the CRT screen 1 and blocks the electromagnetic waves emitted from the screen 1, is as follows.
A frame body 20, a mesh sheet 30 for blocking electromagnetic waves, and a holding member 40 are provided. The frame body 20 has a thin plate frame shape, and a concave groove 22 is formed on the back surface of the frame body 20 so as to extend in an annular shape along the frame body 20. Further, mounting members 24 for mounting the electromagnetic wave shielding filter 10 on the CRT device 2 are provided near both upper ends of the frame body 20.

The mesh sheet 30 is made of a mesh of polyester and is copper-plated to give conductivity. Furthermore, it is chrome-plated to suppress the reflection of light, and CR
It is configured to reduce irritation to the eyes of the viewer of the T screen 1. As shown in FIG. 4, the pressing member 40 has a surface of a core member 42 formed by molding synthetic rubber having high elasticity into a circular cross section.
A spun yarn formed by twisting a large number of short fibers is circularly knitted and covered with a conductive spun yarn 44 that has been subjected to conductivity imparting treatment (copper plating and then nickel plating treatment). The conductive spun yarn 44 is fluffed, and a large number of fine short fibers 46 of conductive short fibers extend outward from the surface thereof. The surface resistance of this conductive spun yarn 44 is 1
0 Ω / cm ² or less, preferably 10 ⁻¹ Ω / cm ²
It is the following.

Such an electromagnetic wave shield filter 10
Then, the procedure for adhering the reticulated sheet 30 to the frame 20 is as follows. That is, the mesh sheet 30 is placed on the concave groove 22 of the frame body 20, and the pressing member 40 is press-fitted into the concave groove 22 from above. Then, the mesh sheet 30 is sandwiched between the pressing member 40 and the concave groove 22, and the electromagnetic wave shielding filter 10 is completed. At that time, the mesh sheet 30 contacts the conductive spun yarn 44 and the fine bristles 46 in the groove 22.

The completed electromagnetic wave shielding filter 10
Is mounted on the front surface of the CRT screen 1 using the mounting member 24. In the electromagnetic wave shielding filter 10 thus arranged, the mesh sheet 30 blocks the electromagnetic waves emitted from the CRT screen 1. By blocking the electromagnetic waves, the electric charges generated in the mesh sheet 30 are discharged (through the conductive spun yarn 44 or directly) from the tips of the fine hairs 46 into the air, and thus the mesh sheet 30 is less likely to be charged with static electricity.

Further, in the completed electromagnetic wave shield filter 10, the mesh sheet 30 can be easily removed from the frame body 20 only by pulling out the holding member 40 from the groove 22 by an operation such as pulling the mesh sheet 30 itself. Can be done. Therefore, for example, it is possible to easily perform maintenance work such as replacing the broken mesh sheet 30 with a spare mesh sheet or removing the dirty mesh sheet 30 for cleaning.

In this embodiment, the mesh sheet 30 is made of polyester woven fabric plated with copper. However, any conductive mesh sheet material may be used, such as nickel plating instead of copper plating. . For example, a sheet formed by forming a copper wire into a mesh may be used. Further, the conductive mesh may be covered with a transparent, flexible and conductive film to form a mesh sheet. Further, the conductive net is covered with a transparent plate material, the net is protruded from the end of such a plate to form a mesh sheet, and the net protruding from the plate is sandwiched between the pressing member and the recess. May be.

Further, in this embodiment, the mesh sheet 30 is chrome-plated and processed so that light is not reflected.
Instead of chrome plating, it is possible to use any means for preventing light reflection, such as coloring the mesh sheet 30 black with carbon paint. In addition, in the present embodiment, the concave groove 22 is formed in a shape that extends in an annular shape along the frame 20.
Does not have to be annular. For example, as the linear groove, a groove having a plurality of grooves may be provided, such as two grooves provided on each of the left and right sides of the frame body. Further, the concave portion is not limited to the groove but may be a hole or the like. For example, a plurality of round holes may be provided along the frame.

In the present embodiment, the pressing member which is formed in a circular cross section is formed in a shape corresponding to the concave portions having various shapes as described above. That is, when the concave portion is formed as a concave groove or a groove, the pressing member has an elongated shape. The pressing member may have a prismatic shape or any other shape as long as it can be fitted in such a recess. Further, when the concave portion is the annular concave groove 22, the elongated pressing member may be in the shape of a continuous annular shape. Further, when the concave portion has a plurality of round hole shapes, the number of spherical pressing members corresponding to the number of the round holes may be used.

In the present embodiment, the core material 42 is made of synthetic rubber, but not limited to synthetic rubber, it is possible to use as the core material any material having an appropriate elasticity for press-fitting into the concave portion to sandwich the mesh sheet. I can. Further, the means for attaching the pressing member 40 to the recess is not limited to press fitting, but the mesh sheet can be sandwiched between the recess and the fitting, and the mesh sheet and the frame can be easily attached and detached. Any means may be used as long as it is a means.

The conductive spun yarn 44 in this embodiment is also used.
Also, instead of the fine bristles 46, it is possible to dispose around the pressing member, such as a yarn-shaped member, a fluff-shaped member, a feather-shaped member, a brush-shaped member, etc. It is possible to use any device having a plurality of projecting tips and capable of discharging static electricity into the air from the tips.

Further, in the present embodiment, the conductive spun yarn 44, which is formed by circular knitting and covers the periphery of the core material, is formed by twisting a large number of short fibers together. Fine hair may be attached by electrostatic flocking to a thread with fine hair to give conductivity, and the conductive thread with fine hair may be circularly knitted to cover the periphery of the core material. .

Furthermore, the conductive spun yarn 44 of this embodiment
Instead of the pressing member 40 configured to cover the surface of the core material 42 by circular knitting with, the surface of the core material 42 is directly attached with fine fibers such as short fibers and fluff by a method such as electrostatic flocking,
A pressing member may be formed by subjecting such a core material with fine hairs to a treatment for imparting conductivity.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a main part of the present embodiment.

FIG. 2 is an overall perspective explanatory view when the present embodiment is attached to a CRT device 2.

FIG. 3 is a sectional view taken along the line AA of the present embodiment shown in FIG.

FIG. 4 is an explanatory perspective view of an essential part of a holding member 40 used in this embodiment.

[Explanation of symbols]

1 ... CRT screen, 2 ... CRT device, 10 ... Electromagnetic wave shield filter, 20 ... Frame body, 22 ... Recessed groove,
30 ... Mesh sheet, 40 ... Holding member, 42
... core material, 44 ... conductive spun yarn, 46 ... fine hair,

Claims (1)

(57) [Scope of utility model registration request] 1. An electromagnetic wave shield filter, which is arranged on the front surface of a screen of a display device that emits electromagnetic waves and shields the electromagnetic waves, comprising: a ring-shaped frame body provided with recesses; Formed sheet for electromagnetic wave shield,
An electromagnetic wave shield filter, comprising: a conductive short fiber in the periphery, and a pressing member which is fitted into a recess of the frame body and clamps the sheet between the recess and the recess.