JPH02219637A - Multifunctional sheet and its manufacture - Google Patents

Abstract

PURPOSE:To enable an objective sheet to be used as an antenna member or a heater member, while electromagnetic wave-shielding property and transparency are provided by a method which the transparent conductive metallic layer on which a number of fine through-holes are formed almost uniformly or in a suitable pattern, is laminated on the whose surface of the sheetlike base composed of the film, etc., made of transparent synthetic resin. CONSTITUTION:The colored photoresist resin film 5 on which a number of fine through-holes 6 similar with fine through-holes 3 are uniformly formed, is stuck onto the surface of the metallic layer 2 of the sheet like base made by laminating the conductive metallic layer 2 such as aluminum, copper, stainless steel or iron on the whole surface of the film made of transparent synthetic resin, and is laminated thereon, and then the resin is cured by radiating ultraviolet rays. Etching operation is applied to the conductive metallic layer 3 through the fine through-holes 6 of the resist resin film 5, thereby forming fine through- holes 3. The sheet may be used in the state as it is according to the object, but generally, the photoresist resin layer is further removed from this state, and the multifunctional sheet is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sheet that has transparency and flexibility, and has functions that can be used as an electromagnetic shielding material, an antenna material, and a heater material.

[Conventional technology]

Conventionally, sheet materials that have transparency, flexibility, and shielding properties against electromagnetic noise are: 1. When forming synthetic resin films and sheets, in order to impart conductivity to these films and sheets, It is known that metal fillers made of aluminum, copper, zinc, stainless steel, etc. are mixed into the molding raw material.

[The problem that the idea aims to solve]

However, the conventional synthetic resin films and sheet materials that provide shielding properties against electromagnetic noise are molded by mixing conductive metal filler into the raw materials during the molding process, and are manufactured exclusively as materials for electromagnetic shielding. ing. For this reason, it is necessary to decide in advance at the manufacturing stage whether to make the metal filler mixed into the raw material into flakes, powder, or fibers, taking into consideration the purpose, formability, cost, etc. of the film or sheet to be formed. There are issues that need to be addressed.

In addition, if metal fillers are mixed into synthetic resins, not only will it be difficult to improve moldability and product appearance when forming films and sheets, but if there is a large amount of metal fillers mixed into the raw materials, electromagnetic waves will be generated. Although shielding performance is improved, there is also the problem that transparency is reduced.

[Means to solve the problem]

The present invention eliminates the above-mentioned problems of conventional films and sheets formed exclusively for electromagnetic shielding, and further provides electromagnetic shielding properties and transparency, as well as functions that can be used as antenna materials and heater materials. The structure of the multifunctional sheet is that a large number of fine holes are formed almost uniformly or in an appropriate pattern on the entire upper surface of a sheet-like base material made of a transparent synthetic resin film, etc. Laminating the formed transparent conductive metal layer,
The thin metal layer is characterized in that it functions as an electromagnetic noise shielding layer, an antenna material, or a heater material, and the manufacturing method consists of a transparent thin layer with a conductive metal layer formed on the top surface. A photoresist resin layer is laminated on the conductive metal layer of a sheet-like base material made of a synthetic resin film, etc., and a large number of micropores are formed in the resin layer substantially uniformly or in an appropriate pattern. After the photoresist resin is cured as shown in FIG. Its main feature is to remove the photoresist resin left behind.

(Function) The metal part of the conductive metal layer, which has a large number of fine holes arranged uniformly or in a pattern on the upper surface of the sheet-like base material, absorbs electromagnetic waves and emits them. to shield.

Furthermore, by setting the transparency to 70% or more, it can be used as a light-shielding sheet.

The sheet of the present invention is attached to the inner surface of a glass plate, etc. with the conductive metal layer side, or is placed inside a laminated glass, so that it has conductivity, for example, vertically, horizontally, or diagonally. Therefore, it can be used as an antenna material, and by connecting a terminal from a power source to the metal part of the metal layer, it can be used as a surface heater.

(Example〕 Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partially enlarged perspective view of an example of the multifunctional sheet of the present invention;
FIG. 2 is an enlarged cross-sectional view, FIG. 3 is a separate enlarged cross-sectional view, and FIG. 4 shows the process of manufacturing the multifunctional sheet of the present invention. (b) is an enlarged cross-sectional view of the state in which photoresist resin is laminated on a sheet-like base material, and (c) is a cross-sectional view of the state in (b) after being etched to form a large number of fine holes in the metal layer. This is an enlarged view and is the same as FIG. 3, and (D) is an enlarged cross-sectional view of the state shown in (C) with the photoresist resin layer removed, and is the same as FIG. 2.

In FIGS. 1 and 2, 1 is a transparent synthetic resin film with a thickness of about 10 to 50 μm, and 2 is a transparent synthetic resin film having a thickness of about 10 to 50 μm, and 2 has a large number of fine holes 3 on the entire upper surface of the film 1, which has visibility after lamination. 4 is a metal portion of the metal M2. An example of the multifunctional sheet of the present invention is constructed as described above.

What is shown in FIG. 3 is a layer 5 of the resin layer 5 formed by laminating and curing a photoresist resin colored in an appropriate color on the metal part 4 of the multifunctional sheet. This is a multi-functional seat.

The metal portion 4 mentioned above is formed by a narrow line of 70 to 500 μm in width, and the total area of the fine holes 3 is set to be 70% or more of the sheet surface area.

The multifunctional sheet of the present invention is constructed as described above.

It is manufactured by the method described below.

That is, a conductive metal layer 2 of aluminum, copper, stainless steel, iron, etc. is formed on the entire upper surface of a transparent synthetic resin film 1.
A colored photoresist resin film in which a large number of fine holes 6 similar to the fine holes 2 are uniformly formed on the surface of the metal M2 of a sheet-like base material (see FIG. 4 (a)) formed by laminating the above-mentioned fine holes 2. Paste 5.

After laminating, the resin is cured by irradiation with ultraviolet rays (see FIG. 4(b)).

Next, the conductive gold RII 2 is etched through the fine holes 6 of the photoresist resin film 5,
This sheet is the same as the multifunctional sheet shown in FIG. 3, and can be used as it is, but usually it is further From this state, the photoresist resin layer is removed to obtain the same multifunctional sheet as shown in Figures 1 and 2.
(See Figure 4 (d)).

In the above method, in order to form a photoresist resin layer, microscopic holes 6 were formed in the resin film 5 and attached to the surface of the conductive metal layer 2. A photoresist resin solution is applied and laminated on the surface of the conductive metal layer 2, and the uncured resin is cured by irradiating ultraviolet rays so that a large number of micropores are uniformly formed in the resin layer. At the same time, the conductive metal layer 2 may be etched to provide fine holes 3 in the conductive metal layer 2.

In the multifunctional sheet of the present invention constructed and manufactured as described above, a large number of fine pores are uniformly or Since it is provided in a pattern, if it is used as an electromagnetic wave shielding material, the metal part of the conductive metal layer will absorb electromagnetic waves and shield them, and the transparency will be increased to 70%.
By doing the above, it can also be used as a light-shielding sheet with transparency.

Therefore, if the conductive metal layer side is applied to the window glass of a building or the windshield of a car, it will block electromagnetic waves that try to enter the inside of the building or car.

You can see the outside without being adversely affected by electromagnetic waves, and it becomes difficult to see the inside of the car or the interior of the car from the outside.

Further, by making a part of the metal part of the metal layer conductive, for example, vertically, horizontally, or diagonally, it can also be used as an antenna material.

Furthermore, the above-mentioned sheet can be pasted by placing the conductive metal layer side on the inner surface of a glass plate or the like, or by interposing it in a laminated glass, and connecting a terminal from a power source to the metal part of the metal layer.
Since it can be used as a surface heater, if it is attached to the windshield of a car and used as described above, it can prevent the glass from fogging.

〔Effect of the invention〕

Since the present invention is as described above, it is convenient because it can be used for a variety of purposes such as electromagnetic shielding materials, nine-sided heaters, antennas, and light-shielding sheets. It can be manufactured extremely easily and with high precision by applying the following parts.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged perspective view of an example of the multifunctional sheet of the present invention;
FIG. 2 is an enlarged cross-sectional view, FIG. 3 is a separate enlarged cross-sectional view, and FIG. 4 shows the process of manufacturing the multifunctional sheet of the present invention. (b) is an enlarged cross-sectional view of a sheet-like base material laminated with a photoresist resin with a large number of uniformly formed micro holes, and (c) is a metal layer obtained by etching the photoresist resin in (b). (D) is an enlarged cross-sectional view of the state in which a large number of fine holes are formed, and (D) is an enlarged cross-sectional view of the state (C) with the photoresist resin layer removed. DESCRIPTION OF SYMBOLS 1... Sheet-like base material, 2... Conductive metal layer, 3...
- Microscopic pores, 4... Metal part of the conductive metal layer, 5...
Photoresist resin, 6... Fine holes provided in the photoresist resin

Claims (1)

[Scope of Claims] 1. A transparent conductive metal layer in which a large number of fine holes are formed substantially uniformly or in an appropriate pattern is laminated on the entire upper surface of a sheet-like base material made of a transparent synthetic resin film, etc. death,
A multifunctional sheet characterized in that the metal thin layer functions as an electromagnetic noise shielding layer and an antenna material. 2. A transparent conductive metal layer in which a large number of fine holes are formed substantially uniformly or in an appropriate pattern is laminated on the entire upper surface of a sheet-like base material made of a transparent synthetic resin film, etc., and the metal thin layer is laminated. A multifunctional sheet that functions as an electromagnetic noise shielding layer and a heater material. 3. The multifunctional sheet according to claim 1 or 2, wherein the sheet-like base material is a synthetic resin sheet material sandwiched between laminated glass. 4. The multifunctional sheet according to claim 1 or 2, which has a transparency of 70% or more. 5. On the conductive metal layer of a sheet-like base material, such as a transparent synthetic resin film with a conductive metal layer formed on the upper surface, a photoresist resin is applied so that a large number of fine holes are formed substantially uniformly or in an appropriate pattern. After laminating and curing the conductive metal layer so that the resin layer is formed, the part of the conductive metal layer where the resin layer is not formed is removed by etching, and if necessary, the photo remaining on the metal layer is removed. A method for producing a multifunctional sheet, characterized by removing resist resin. 6 A photoresist resin layer is laminated on the conductive metal layer of a sheet-like base material made of a transparent synthetic resin film or the like with a conductive metal layer formed on the upper surface, and a large number of micropores are formed in the resin layer. After curing to form substantially uniformly or in an appropriate pattern, the uncured photoresist resin is removed and a large number of fine holes are formed uniformly or in an appropriate pattern in the conductive metal layer by etching. . A method for producing a multifunctional sheet, further comprising removing photoresist resin left on the metal layer as necessary. 7. The method for producing a multifunctional sheet according to claim 5 or 6, wherein the photoresist resin layer is colored.