JPS6115480A - Transparent faceplate for display device - Google Patents

Abstract

PURPOSE:To protect the observer by constituting a transparent face plate of a display with an electromagnetic shield net in which net wires made of electromagnetic shield members are crossed and a transparent member supporting the shield net in a shape of a board. CONSTITUTION:The net is formed by knitting longitudinally and laterally fine wire metallic base material 2 made of a metallic base material having the capability of electromagnetic shield such as copper, iron or stainless steel and the shield net 1 is formed by coating a copper oxide film to the net member. Transparent resin plates 3, 4 such as acrylic resin are bonded to the front and rear surface of the shield net 1 so as to form a rectagular form, the outer peripheral is applied with a support frame 5 having a channel shape cross section made of acrylic resin or polyvinylchloride to constitute a transparent face plate 7a. The transparent face plate 7a is fitted to the outer peripheral frame of a screen of a display device by using double coated tape or a proper locking hook and the radiation of an electromagnetic wave from the display device is blocked effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a light-transmitting face plate used for the screen of a display device such as a computer or a word processor.

<Problems to be Solved by the Invention> As is well known, a display device displays information by displaying light on a cathode ray tube screen. By the way, this cathode ray tube uses an electron gun to emit an electron beam to scan the fluorescent screen and draw bright spots that form characters according to the signal. Electromagnetic waves such as low frequencies, radio waves, and microwaves are emitted. These unnecessary electromagnetic waves are harmful to the human body and cause eye strain in observers, and there are various warnings from experts such as electromagnetic fields stimulating the central nervous system and causing stress in people. Although its effects are not fully understood, in recent years it has become a serious problem for the preservation of the working environment.

An object of the present invention is to provide a light-transmitting face plate for a display device that is placed in front of a screen of a cathode ray tube to shield electromagnetic waves and protect viewers from the effects thereof.

Means for Solving the Problems> The present invention comprises an electromagnetic shielding net formed by intersecting mesh wires made of electromagnetic shielding material, and a translucent plate material holding the shielding net in a plate shape. It is.

Effect> The electromagnetic shielding net blocks electromagnetic waves radiated from the screen of the display device. At this time, the character 1 graphic on the screen is transmitted through the opening of the shielding net, and since the plate holding the shielding net is translucent, there is no problem in viewing it.

<Example> Configuration example of electromagnetic shielding net Structure example 1 The electromagnetic shielding net is a mesh wire made by coating a copper oxide coating on a metal base material having electromagnetic shielding ability such as copper, iron, or stainless steel. It can be configured by

That is, in Figure 1, l is a thin wire metal base material 2 made of a metal base material with electromagnetic shielding ability such as copper, iron, stainless steel, etc.
This is a shielding net made by knitting in the vertical and horizontal directions to form a net material, and coating this with a copper oxide coating.

The outer diameter of the metal base material 2 is approximately 501L, which is 250L.
They are knitted vertically and horizontally at intervals of 1 L to form a shielding net 1 with an aperture ratio of about 50 to 70%. Therefore, the transparency is extremely good.

Moreover, the electromagnetic shielding net becomes gray or black due to the copper oxide coating, and scattering of light by the thin wire-shaped metal base material is prevented.

Further, since copper oxide also has shielding ability, it can be superimposed on the metal base material 2 to increase the electromagnetic shielding ability. The chroma from gray to black due to the copper oxide coating can be selected in accordance with the degree of oxidation by reacting copper with an oxidizing agent to adjust the degree of oxidation.

When using stainless steel as the thin wire metal base material 2, since the surface structure of stainless steel is dense, copper oxide plating or silver plating cannot be applied directly, and only when subjected to Ni-Nkel plating treatment. It becomes possible. For this reason, it is necessary to form a net material from the metal base material 2 and then immerse it in a nickel plating bath containing a hydrochloric acid solution to perform nickel plating as a pretreatment. Here, the surface of the stainless steel is eroded by the hydrochloric acid solution, and the nickel plating treatment becomes possible. After applying such nickel plating, copper oxide plating is applied.

In the above configuration, since the nickel also has electromagnetic shielding ability, the thin wire metal base material 2. #, it can be further superimposed on the cuprate film to increase the electromagnetic shielding ability.

In forming the shielding net, a nickel coating with a thickness of about 20 mm and oxidation is applied to the front and rear surfaces of a metal substrate having electromagnetic shielding ability such as copper, iron, stainless steel, etc., without depending on the organization of the thin wire metal base material 2. It can also be formed by forming a copper film and drilling a large number of openings in the substrate using laser light. In this case, each coating may be formed after forming an opening in the substrate.

Configuration Example 2 Furthermore, the shielding net may be constructed by intersecting mesh wires in which a silver coating and a copper oxide coating are sequentially deposited on a metal base material capable of electromagnetic shielding such as copper, iron, or stainless steel. can.

In addition to the structure example 1, this structure example 2 further has a silver coating applied to the metal base material.

In this case as well, if stainless steel is used, it is necessary to perform nickel plating before silver plating.

Silver has high magnetic permeability and electrical conductivity, and can be expected to have a good electromagnetic shielding effect. Moreover, each of the metal base material, nickel, silver, and copper oxide coatings has an electromagnetic shielding ability, and since their effective frequency bands are different, the shielding effects occur in a superimposed manner. Therefore, it was possible to detect that there was an excellent effect as shown by the experimental results described later.

Note that in this embodiment as well, perforation can be performed using laser light as described above.

I. Formation example of translucent plate material” On the front and rear surfaces of the shielding net 1, as shown in FIG.
are joined to form a rectangular shape, and a holding frame 5 made of a material such as acrylic resin or vinyl chloride resin and having a U-shaped cross section is fitted around the outer periphery of the holding frame 5 to form a light-transmitting face plate 7a.

The translucent resin plates 3.4 may be made of a translucent material with an appropriate color such as green, gray, pink, or red, and each has a thickness of about 2 to 5 m. By covering the front and rear surfaces of the shielding net 1 with transparent resin plates 3 and 4, oxidation and corrosion thereof are prevented and handling becomes easy.

The front surface of the translucent resin plate 3.4 (translucent plate material) may be matted to prevent reflection on the plate surface.゛The translucent face plate 7a having the above structure can be attached to the outer peripheral frame of the screen by attaching the holding frame 5 to the outer periphery of the screen using double-sided adhesive tape, a suitable locking hook, etc., or by using a suction cup provided on the outer periphery of the translucent face plate 7a. , can be attached to an existing display device 10.

FIG. 3 shows a light-transmitting face plate 7b that can be attached by contacting the screen 13 of a cathode ray tube 12, which will be described later. The light-transmitting resin plates 3 and 4 made of acrylic resin or the like are joined together to form a gently curved surface that bulges toward the front side.

In forming the light-transmitting face plate 7b, the peripheral portion of the shielding net 1 protrudes from the light-transmitting resin plate 3 on the rear surface and is wound to provide an attachment loop 6.

In order to attach the light-transmitting face plate 7b to the display device 10, as shown in FIG. It is attached in contact with the screen 13 of the cathode ray tube 12.

Another way to attach the light-transmitting face plate 7b is to arrange an annular elastic material made of silicone rubber or the like around the outer periphery of the light-transmitting face plate 7b, and wrap the periphery of the # marked shielding net 1 around the elastic material. can. Alternatively, a conductive net material is provided around the outer periphery of the elastic material to constitute a packing material, and a shielding net is attached to the packing material.
It can also be installed by connecting the peripheral parts.

The light-transmitting face plates 7a and 7b may be fixedly attached during the manufacturing process of the display device 10, or may be detachably attached after manufacturing.

As described above, various means for attaching the light-transmitting face plates 7a, 7b to the display device IO are conceivable.

The method of joining the translucent resin plates 3 and 4 before and after the shielding net l to form a translucent plate material includes a method using an adhesive;
Various methods such as thermocompression bonding of the translucent resin plates 3 and 4 to the shielding net 1 can be considered.

Further, the translucent plate material may be composed of a translucent resin material that integrally covers the electromagnetic shielding net, and in this case, monomers are placed before and after the shielding net l, and this is polymerized. Shielding net 1
A method such as arranging a mold with a gap before and after the mold and injecting a translucent resin material into the gap is used.

However, in order to ensure that the surface is smooth and bubbles are not generated inside, it is easy to use adhesive.

Here, the light-transmitting face plates 7a and 7b are attached to the front surface of the screen by the means described above, but assuming that the running force direction of the mesh lines of the shielding net l is along the length and width of the light-transmitting face plate, The direction of the scanning lines on the screen is horizontal and coincides with the direction of the mesh lines.Therefore, the mesh lines and scanning lines overlap and interfere with each other, reducing the clarity of the image on the display. The purchase price will decrease.Therefore,
The direction of the mesh line of the shielding net l is approximately 45'' with respect to the outer peripheral frame.
It is desirable that the scanning line be tilted so that it is not coincident with the direction of the scan line.

The display device 10 has its outer periphery covered with a metal coating having electromagnetic shielding ability such as copper foil.1. %, said fitting part 1
By electrically connecting 1 to the coating, the display device l
Emission of electromagnetic waves from O can be more effectively prevented.

The shielding effect of the present invention was tested using a thin wire-shaped metal base material 2 made of stainless steel, the outer diameter of the metal base material 2 was approximately 50μ, and a 254#L test example. They are arranged vertically and horizontally at intervals, and nickel plating and silver plating are sequentially applied to them, and a copper oxide plating layer is further formed to form a black shielding net 1. Transparent resin plates 3 made of acrylic resin are placed in front and behind it. The shielding effect on the frequency of electromagnetic waves was measured for the transparent face plate 7 formed by bonding .4.

One test method: As shown in FIG. 5, an opening 0 was formed in the electromagnetic shielding chamber r, and the transparent face plate 7a was fitted into the opening 0.

The oscillation Iax is placed outside the electromagnetic shielding room r, and the receiver y is placed inside the electromagnetic shielding room r, and the antenna 2 and the receiver y are placed opposite each other through the transparent faceplate 7, and the antenna 2 and the opposite side surface of the transparent faceplate 7 are arranged. The distance d from the center was set to 305 mm (12 inches).

At this time, a loop antenna was used for measurements at an oscillation frequency of 20 MHz or less, and a dipole antenna was used for measurements at an oscillation frequency of 100 MHz or higher.

·Test results The following results were obtained in the above test.

Electromagnetic wave frequency Shielding effect 150KHz 35dB 500KHz 47dB 10MHz 78dB 20MHz 90dB100
MHz 107d107dB40
0 70dBIGI(z
49 dB <Effect of the Invention> As clarified by the above description, the present invention comprises an electromagnetic shielding net formed by intersecting mesh wires made of electromagnetic shielding material, and a translucent structure that holds the shielding net in a plate shape. Since the transparent surface plate 7 for the display device is constituted by the plate material, the electromagnetic shielding net blocks the electromagnetic waves from the cathode ray tube without impairing the clarity of the image on the screen, and protects the viewer from its influence. It has excellent effects such as significantly reducing eye fatigue.

In addition, in the case of using the shielding net 1 of Configuration Examples 1 and 2, the shielding net 1 becomes gray or black with appropriate saturation due to the copper oxide coating, and scattering of light by the shielding net 1 is prevented. This can prevent eye fatigue. Furthermore, in the configuration example 2, since a silver coating is formed, the shielding ability can be increased in combination with the metal base material having electromagnetic shielding ability, and the shielding effect is enhanced.

[Brief explanation of drawings]

The accompanying drawings show one embodiment of the present invention, and FIG. 1 is an enlarged plan view of the shielding net 1, FIG. 2 is a longitudinal cross-sectional side view of the transparent face plate 7a, and FIG.
The figure is a longitudinal cross-sectional side view of the transparent face plate 7b, and FIG. 4 is a vertical side view of the transparent face plate 7b.
FIG. 5 is a vertical side view schematically showing the state in which the display device 10 is attached to the display device 10, and FIG. 5 is a vertical side view schematically showing the test method. l; Shielding net 2; Thin material 3, 4: Transparent resin plate 7; Transparent face plate 10; Display device applicant Riken MC Co., Ltd. agent Patent attorney Kita Matsuura
Male FIG, 4 10 b 11

Claims (1)

[Claims] 1) A transparent face plate for a display device comprising an electromagnetic shielding net constituted by mesh wires made of an electromagnetic shielding material, and a transparent plate material holding the shielding net in a plate shape.2) Electromagnetic shielding. The net is copper,
Claim 1) Consisting of a mesh wire formed by coating a copper oxide coating on a metal base material such as iron that has electromagnetic shielding ability.
3) The electromagnetic shielding net uses stainless steel as a metal base material with electromagnetic shielding ability, forms a nickel plating film on the metal base material, and then coats the metal base material with a copper oxide film. 4) The electromagnetic shielding net is formed by coating a metal base material with electromagnetic shielding ability such as copper, iron, or stainless steel with a silver coating. , a copper oxide coating, and a copper oxide coating are successively applied to each other.
5) The electromagnetic shielding net uses stainless steel as a metal base material with electromagnetic shielding ability, and after forming a nickel plating film on the metal base material, a silver film and a copper oxide film are formed on the metal base material. 6) The electromagnetic shielding net is made of a fine wire metal base having electromagnetic shielding ability such as copper, iron, stainless steel, etc. A net material made by organizing materials vertically and horizontally,
Claims 2) to 2) constituted by forming each film.
Transparent face plate for a display device according to claim 5) 7) The front and rear surfaces of an electromagnetic shielding net are sandwiched and covered with transparent plate materials, respectively.The transparent face plate for a display device according to claim 1) Face plate 8) A transparent face plate for a display device according to claim 1, which is formed by integrally covering an electromagnetic shielding net with a transparent resin material and molding it into a plate shape.