JPS59167103A - Parabolic reflective plate for antenna - Google Patents

Abstract

PURPOSE:To attain a reflective plate superior in durability which is not broken easily even if foreign matters collide against this reflective plate in case of carrying, setting, or other handling by forming a surface layer into one body together with a reflective plate substrate and a reflective material with a fiber- reinforced plastic. CONSTITUTION:With respect to a parabolic reflective plate, a surface layer B formed on the surface of a metallic reflective material A2 is constituted with a fiber-reinforced plastic and is formed into one body together with the reflective material A2 and a reflective plate substrate A1. This reflective plate is produced as follows; first, a pair of dies consisting of a male die 7 and a female die 8 between which a junction space 9 is formed into the shape of a parabolic reflective plate A are attached to a press device and are heated at about 140 deg.C, and next, fibers such as a glass mat 10 are placed on the surface of the female die 8 in the state, where the gap between male die 7 and the female die 8 is opened as shown in the figure, and a wire net 11 is placed on this glass mat and a sheet molding compound 12 is placed on the wire net 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parabolic reflector for an antenna used for receiving radio waves.

Conventionally, as this type of parabolic reflector, for example, the first
Structures as shown in Figures 3 to 3 are generally used. That is, as shown in Fig. 1 is a front view, Fig. 2 is a side sectional view, and Fig. 3 is an enlarged view of portion A' in Fig. 2, parabolic reflector A concentrates radio waves at one point. It consists of a disc-shaped structure with one side formed into an arc-shaped concave surface,
As shown in the enlarged view of FIG. 3, a plastic reflector substrate Al for maintaining strength, a metal reflector A2 formed on the upper surface of this reflector substrate A+ to reflect radio waves, A plastic surface layer B coated on the surface of the reflective material A2 to prevent corrosion of the metallic reflective material A2 and protect it from flying objects, and a metal mounting screw for fastening the parabolic reflective plate A to the mount. C1 is embedded therein, and a plurality of plastic mounting seats C (usually four in symmetrical positions) are integrally attached to the back surface of the reflector substrate AI.

The antenna component using this parabolic reflector A is the fourth
Assembled as shown. That is, metal supports 1 and 2 are attached to the bottom and sides of the parabolic reflector A, and a horn 3 and a waveguide 4 are attached to the intersecting tips of the supports 1 and 2.
Then, the converters 5 are connected and supported and fixed, and the mounting seat C on the back side of the parabolic reflector A is screwed and fixed to the support frame 6' of the mount 6, and the entire antenna assembly is installed on the mount 6. . When this antenna assembly is installed outdoors at a high place with relatively few obstacles and the parabolic reflector A faces the radio wave receiving direction, the radio waves will be transmitted to the parabolic reflector A.
The light is reflected by the reflective material A2, collected by the horn 3, and further guided to the waveguide 4 and converter 5.

The conventional parabolic reflector A as described above has the following drawbacks. That is, since the surface layer B for protecting the metal reflective material A2 is simply a coating made of plastic resin, when the parabolic reflector A is transported or installed outdoors, other foreign substances may be deposited on the surface layer B. If there is contact or collision, the resin of the surface layer B will peel off, and the metal reflective material A2 will be easily damaged. Furthermore, due to long-term outdoor use of the reflector A, the resin of the surface layer B deteriorates and cracks occur, and these cracks occur in the reflector A2.
It may progress to. As mentioned above, the surface layer B has peeled off, the scratches on the surface FtB have reached the reflective material A2,
Or, if the crank reaches the reflective material A2 and is used outdoors as is, the metal reflective material A2 will corrode, and due to this corrosion of the reflective material A2, the reflective performance of the parabolic reflector A will significantly decrease. , there is a drawback that the appearance of the parabolic reflector A is significantly impaired.

The present invention has been made for the purpose of eliminating the drawbacks of the conventional parabolic reflector as described above, and providing a parabolic reflector that is strong in shock and weather resistance and has excellent durability. In a parabolic reflector formed by laminating a reflective material on a surface and coating the reflective material surface with a surface layer, the surface layer is molded integrally with the reflector substrate and the reflective material from fiber-reinforced plastic. This is a parabolic reflector for antennas.

That is, in the parabolic reflector of the present invention, as shown in FIG. 3, the surface layer B formed on the surface of the metal reflective material A2 is composed of fiber reinforced plastics, It is formed integrally with the plate substrate A1.

Next, an example of the method for manufacturing the parabolic reflector of the present invention will be described in the fifth section.
This will be explained based on the diagram and FIG.

First, a pair of molds consisting of a male mold 7 and a female mold 8 in which the joint space 9 of the molds is formed in the shape of a parabolic reflector A is attached to a press machine (not shown), and the temperature of the molds is adjusted. Approximately 140
℃ using an electric heater or a steam heater (not shown). Next, as shown in FIG. 6, with a gap between the male mold 7 and the female mold 8 left open, fibers such as a glass mat 10 are placed on the surface of the female mold 8, and a wire mesh 1 is placed on top of the glass mat 10.
After placing 1. Furthermore, sheet molding compound (Sheet Molding Co.
(hereinafter simply referred to as SMC) 12 is placed. This SMC is made of, for example, the following materials. That is, a glass fiber such as a glass cloak is impregnated with an unsaturated polyester resin solution containing a heat curing agent, a thickener, a pigment, a filler, etc., and the viscosity of the saturated polyester resin solution is increased after impregnation. It is a composite material for molding. Incidentally, as a pigment to be mixed, carbon blank or the like is added in order to obtain the external color of the parabolic reflector A, and as a filler, calcium carbonate, asbestos, etc. are added in order to reduce the cost of the product.

Next, when the mold is closed, the SMC 12 is softened by the heat of the mold, and the SMC solution is moved by the pressurizing force of the press device to form the gap 9 between the male mold 7 and the female mold 8 shown in FIG. filled within. After a while in this state, the unsaturated polyester resin was cured by the reaction of the heat curing agent mixed in the SMC, and the glass mat 10, the wire mesh 11, the substrate Ar made of SMC, and the screw mounting seat C were integrally formed. A parabolic reflector A is manufactured. In this case, the softened s
Mc passes through the mesh of the wire mesh 11 and is impregnated into the glass mantle 10, and the glass mat 10 passes through the wire mesh 11 using SMC as a medium.
Furthermore, the wire mesh 11 is integrally molded with the reflector substrate A1 made of SMC.

In addition, by attaching the male screw 14 to the recess 13 of the male fitting 7 corresponding to the mounting seat C, the periphery of the male screw 14 is wrapped by SMC, and the mounting seat C to which the male screw 14 is attached is also attached to the body of the reflector A. It is integrally molded with.

In addition, in the above production example, unsaturated polyester was used as the resin and glass fiber was used as the fiber, but other thermosetting resins such as epoxy resin, phenol resin, etc. may also be used. Alternatively, asbestos fiber or synthetic fiber cloth such as nylon cloth or Tetron cloth may be used instead of glass fiber.

Furthermore, an antenna using the parabolic reflector of the present invention can be assembled in exactly the same manner as the conventional product described above.

As explained above, the parabolic reflector of the present invention is a parabolic reflector in which a reflective material is laminated on the reflector substrate surface and a surface layer is coated on the reflective material surface, and the surface layer is made of fibers. Since it is a parabolic reflector made of reinforced plastic and integrally molded with the reflector substrate and the reflective material,
The metal reflective material is extremely strongly protected by fiber-reinforced resin, and will not be easily damaged even if it is hit by foreign objects during transportation, installation, or other handling, and is durable even when used outdoors for a long time. Furthermore, since the surface layer B is integrally formed with the reflector A2 and the reflector substrate /'+, the surface layer B does not peel off from the surface of the reflector A2, and it is difficult for a crank to enter. Therefore, the metallic reflective material does not suffer from corrosion due to contact with the outside air, and it is possible to provide a parabolic reflector of excellent quality without degrading the radio wave reflecting performance or deteriorating the appearance.

Furthermore, the method for manufacturing the parabolic reflector of the present invention is simple and mass production is possible, so it can be supplied at low cost.

[Brief explanation of the drawing]

Figure 1 is a front view of a parabolic reflector, Figure 2 is a side sectional view of a parabolic reflector, Figure 3 is an enlarged view of section A' in Figure 2, and Figure 4 is a parabolic reflector used. FIG. 5 is a sectional view of a mold for manufacturing the parabolic reflector of the present invention, and FIG. 6 is an explanatory diagram of the method of manufacturing the parabolic reflector of the present invention. A... Parabolic reflector, AI...
Reflector board, A2... Reflective material, B...
Surface layer, C...Mounting seat, 1.2...Support, 3...Horn, 4...Waveguide,
5...Converter, 6...Mount,
7...Male mold, 8...Female mold, 10.
...Glass mat, 11 ...Wire mesh, 12
...SMC. Patent applicant Yashiguchi Kako Co., Ltd. Figure 2 Figure 3

Claims (1)

[Claims] In a parabolic reflector in which a reflective material is laminated on a reflector substrate surface and a surface layer is coated on the reflector surface, the surface layer is integrally formed with the reflector substrate and the reflective material using fiber-reinforced plastic. A parabolic reflector for antennas characterized by being molded.