JPH04363902A - Electromagnetic wave reflection body - Google Patents

Abstract

PURPOSE:To realize the inexpensive electromagnetic wave reflecting body with ease of manufacture by providing a uniform electromagnetic wave reflecting layer to a surface layer. CONSTITUTION:An electromagnetic wave reflecting layer 14 made of a conductive metallic material is formed onto the surface of a reflecting mirror auxiliary body 12 by vapor-deposition or hot stamping formed to be a prescribed shape from a thermosetting BMC resin with the injection forming and a protection layer 16 is formed on the layer 14 to be integrated as the electromagnetic wave reflecting body. Thus, since the electromagnetic wave reflecting layer 14 is formed uniformly onto the surface of the reflecting mirror auxiliary body 12, the reflecting body with a high reflectance of the electromagnetic wave is obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave reflector, such as a parabolic antenna used for satellite broadcasting, etc., in which an electromagnetic wave reflecting material layer is formed and integrated on the surface of a resin molded body molded into a predetermined shape.

0002

2. Description of the Related Art As shown in FIG. 3, a satellite broadcasting antenna generally has an electromagnetic wave reflecting material layer 4 on the surface of a resin parabolic body 2 made of resin material by pressure molding.
Further, a protective layer 6 for improving weather resistance is formed and integrated thereon. In order to form this electromagnetic wave reflector, wire mesh or aluminum-deposited nonwoven fabric, which is a component of the electromagnetic wave reflector layer 4, is cut into a predetermined shape, or an aluminum plate is drawn into a predetermined shape. Then, overlap it with the resin material and pressurize it to mold it into one piece. The resin material used is generally SMC (Seat molding co.
mpound) material is used.

0003

[Problems to be Solved by the Invention] Conventionally, since molding is performed by pressure molding, there has been a problem that the molding process becomes long. Conventional resin materials for electromagnetic wave reflectors include:
Since SMC materials are generally used, a device for forming the resin material into a sheet shape is required in advance, resulting in high costs. Further, in order to increase the reflection efficiency of electromagnetic waves, it is desirable that the reflective material layer 4 is uniformly formed on the surface layer of the parabolic body 2. If so, there is a problem in that these particles enter the inside of the parabolic body 2, and the reflective material layer 4 is not uniformly formed on the surface layer of the parabolic body 2, resulting in a decrease in electromagnetic wave reflection efficiency. Another problem was that the nonwoven fabric was torn during molding of the parabolic body 2, making it impossible to form a continuous electromagnetic wave reflecting material layer.

The present invention was made in view of the problems of the prior art, and its purpose is to provide an electromagnetic wave reflector that has a uniform electromagnetic wave reflecting material layer on the surface layer, is easy to manufacture, and is inexpensive. It is in.

[0005]

[Means for Solving the Problems] In order to achieve the above object, in the electromagnetic wave reflector according to the present invention, thermosetting B
MC (Bulk Molding Compound
d) is formed into a predetermined shape by injection molding, and an electromagnetic wave reflecting material layer made of a conductive metal material is formed on the surface of the reflecting mirror auxiliary body by vapor deposition or hot stamping, and a protective layer is further formed on this by painting. It is designed to be integrated as an electromagnetic wave reflector.

[0006]

[Operation] Injection molding has a shorter molding cycle than pressure molding. In addition, since thermosetting BMC resin material is used, SM
It is not necessary to form the resin material to be molded into a sheet shape as in the case of C resin material, and molding is easy, and the molded product is more resistant to heat than a thermoplastic resin molded product. In addition, since the electromagnetic wave reflecting material layer is formed by vapor deposition or hot stamping on the surface of the reflective mirror auxiliary body formed into a predetermined shape, it is easy to form the reflective material layer. Can be formed uniformly and has high electromagnetic wave reflection efficiency.

[0007]

Embodiments Next, embodiments of the present invention will be described based on the drawings. FIG. 1 shows a first embodiment of the present invention, and is a sectional view of a parabolic electromagnetic wave reflector. In this diagram,
Reference numeral 10 denotes a backup material layer formed by injection molding of a thermosetting resin into a parabolic shape, and this backup material layer 1
An electromagnetic wave reflecting material layer 14 in which a metal such as aluminum is vacuum-deposited or sputter-deposited via an undercoat layer 13 is formed on the curved concave side surface of 2, and a weather-resistant top coat layer 16 is further formed on this layer. It has a formed structure. The backup material layer 12 is formed by injection molding BMC resin, and the electromagnetic wave reflecting material layer 14 is formed via an undercoat layer 13 for improving the adhesion of the surface on which the electromagnetic wave reflecting material layer is formed. Note that this undercoat layer 13 may not be provided as long as the adhesiveness between the backup material layer 14 and the protective paint on the outer surface is good.

[0008] The thickness of the electromagnetic wave reflecting material layer 14 is 200 mm.
When the thickness is less than 10 Å, the reflectance of electromagnetic waves decreases significantly;
If it is thicker than 000 Å, the adhesion of the top coat layer 16 will deteriorate significantly, so a range of 200 to 10,000 Å is preferable. The top coat layer 16 is formed from a urethane resin or a fluorine resin in consideration of weather resistance, and may be transparent or opaque.

[0009] In order to manufacture this electromagnetic wave reflector,
Thermosetting BMC is first molded into a predetermined parabolic shape by injection molding, then an undercoat layer 13 is formed as necessary, an electromagnetic wave reflecting material layer 14 is formed by vacuum deposition or sputtering deposition of aluminum, etc., and finally A top coat layer 16 is formed thereon. This electromagnetic wave reflecting material layer 1
4 is formed by vacuum evaporation or sputtering evaporation of aluminum or the like, so the electromagnetic wave reflecting material layer 14 is formed only on the surface layer 12 without penetrating into the backup material layer 12 and having a substantially uniform thickness. has a high reflectance.

FIG. 2 is a cross-sectional view of a second embodiment of the invention. In this embodiment, a parabolic backup material layer 1
An electromagnetic wave reflecting material layer 15 is formed on the concave side of 2 and an aluminum foil 15 is hot-stamped thereon, and a weather-resistant top coat layer 16 is formed thereon. This electromagnetic wave reflecting material layer 15 is made of a back-up material layer 12 formed by injection molding of thermosetting resin BCM into a parabolic shape, and is coated with an adhesive 15 on the back surface, as in the first embodiment described above.
The aluminum foil coated with a is hot-stamped, and the electromagnetic wave reflecting material layer 15 is formed to have a uniform thickness on the surface layer of the backup material layer 12, and has a high electromagnetic wave reflectance.

[0011] In the above-mentioned embodiments, a parabolic electromagnetic wave reflector is described, but the present invention is not limited to the parabolic type, and may be, for example, a flat plate-shaped electromagnetic wave reflector.

0012

Effects of the Invention As is clear from the above explanation, according to the electromagnetic wave reflector according to the present invention, since the reflector auxiliary body is formed by injection molding of BMC resin, the molding cycle is shorter than that of pressure molding. is shorter and easier to mold than when using SMC resin. Furthermore, since it is a molded body of thermosetting resin, it has good heat resistance. In addition, since the electromagnetic wave reflecting material layer is formed by vapor deposition or hot stamping on the surface of the reflecting mirror auxiliary body formed into a predetermined shape, it is easy to form the electromagnetic wave reflecting material layer, and the electromagnetic wave reflecting material layer is formed on the surface layer of the reflecting mirror auxiliary body. It is uniformly formed and has a high reflectance of electromagnetic waves.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of an electromagnetic wave reflector according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of an electromagnetic wave reflector according to a second embodiment of the present invention.

[Figure 3] Partial cross-sectional view of a conventional electromagnetic wave reflector

[Explanation of symbols]

12 Backup material layer 14, 1 which is a reflective mirror auxiliary body
5 Electromagnetic wave reflecting material layer 16 Protective layer that is a top coat layer

Claims (1)

[Claims] 1. An electromagnetic wave reflecting material layer made of a conductive metal material is formed by vapor deposition or hot stamping on the surface of a reflecting mirror auxiliary body, which is formed by injection molding of thermosetting BMC resin into a predetermined shape. An electromagnetic wave reflector characterized by being integrated with a protective layer formed by painting.