JPS6055708A - Parabolic reflector - Google Patents

Abstract

PURPOSE:To obtain a parabolic reflector having a high radio convergence efficiency by coating a recessed surface of a radio reflective layer, which is formed with netted or cloth-shaped conductive material, with a radio-transmissive layer and constituting a convex surface with a reinforced plastic reinforcing layer as one body. CONSTITUTION:A parabolic reflector 1 has a radio reflective layer 2 constituted with a netted or cloth-shaped material which consists of conductive materials such as metallic fibers of Al, Cu, Ni, or the like, carbon fibers, or the like and is distributed with a density of intervals of <=1/4 of wavelength of radio waves to be reflected, and the concave surface of this layer 2 is covered with a radio- transmissive layer 3 consisting of a radio-transmissive synthetic resin. The convex rear face of the reflective layer 2 is formed with a reinforcing layer 4 consisting of a reinforced synthetic resin where reinforcing fibers such as glass fibers, carbon fibers, metallic fibers, or the like are mixed, and the radio-transmissive layer 3 and the reinforcing layer 4 are joined into one body through a space of the reflecting layer. Thus, the radio-transmissive layer 2 is reinforced and covered completely and is shut out from the outside air to attain a very high radio reflection efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parabolic reflector made of a synthetic resin material such as reinforced plastic, and more particularly to a parabolic reflector that has a good radio wave reflecting layer formed at the same time as molding and has high radio wave focusing efficiency. be.

Conventional parabolic reflectors are made of aluminum or FR.
PI! ! It is l. Aluminum materials are mainly small parabolas with a diameter of 1 mm or less, and are formed by drawing or sheet metal press forming. In the case of spatula molding,
Since each piece is produced by hand, quantities are limited for industrial production.

In addition, in the case of sheet metal press forming, there is springback, which not only requires advanced press mold design technology, but also requires special techniques to perform drawing with a depth of 1/8 to 115 or more of the diameter. Requires a highly precisely designed multi-step press process. Furthermore, even in that case, extremely advanced forming technology is required to form the aluminum plate without cracking or wrinkling it.

In addition, in parabolic reflectors using synthetic resin materials such as FRP, a conductive film is formed on the surface of the molded product by metal spraying, sputtering, metal thermal adhesion, etc. in order to provide radio wave reflection properties. There is. However, in this method, the formation of the conductive film is a post-processing process, and when the synthetic resin material is polyester, nylon, polypropylene, polyethylene, ABS, phenol, melamine, etc., the adhesiveness with the metal film is poor. However, in order to prevent peeling, the interface must be pretreated, which requires complicated work and increases manufacturing costs.

The present invention provides a parabolic reflector that does not require post-processing compared to the conventional products as described above, and has extremely good radio wave reflection properties and long-term weather resistance.

The present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of an example of the parabolic reflector of the present invention.

In the figure, 1 is a parabolic reflector, and its concave curved surface forms a normal standard parabolic surface or an offset 1 to parabolic surface. 2 is a radio wave reflecting layer, and this radio wave reflecting layer 2 has a small amount of conductive material such as metal fibers such as aluminum, copper, nickel, etc. or carbon fibers (all have a spacing density of 1/4 or less of the wavelength of the radio waves to be reflected). It may be made of a net-like material, a cloth-like material, or a felt-like material distributed in the following manner.

3 is a radio wave transparent layer made of a radio wave transparent synthetic resin that covers the concave curved surface of the reflective layer 1; for example, glass 11!
It contains fiber mats and is laminated and coated with vesicular polyester resin.

4 is the radio wave reflecting layer 2 made of reinforced synthetic resin containing reinforcing fibers such as glass fiber, carbon fiber, or metal AM.
This is a reinforcing layer formed on the convex back surface of.

Further, the radio wave transmitting layer 3 and the reinforcing layer 4 are integrally bonded to each other through the interval between the radio wave reflecting layers 2, so that the radio wave reflecting layer 2 is completely reinforced and shielded from the outside air.

The radio wave transmitting layer 3 is preferably one that transmits received radio waves well and does not attenuate them, and at the same time, it is preferable to select a layer that has excellent weather resistance and low water permeability. For example, in the case of polyester resin, a thickness of 30 .mu.m to 1 .mu.m is preferable because it satisfies "-2 characteristics".

With the above configuration, it is possible to obtain extremely high radio wave reflection efficiency, and even after long-term use, there is almost no decrease in radio wave reflectivity due to oxidation of the radio wave reflection layer made of metal fibers by water or outside air. In addition, sufficient durability can be ensured against mechanical damage such as delamination.

Conventionally known methods can be used to mold the parabolic reflector of the present invention, and in the case of thermosetting synthetic resins, SMC method, hand lay-up method, resin injection method, mated die method, compression molding method, etc. can be used. Furthermore, in the case of thermoplastic synthetic resin, a stamping method, a vacuum forming method, an insert injection method, etc. can be adopted.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an example of a parabolic reflector of the present invention. 1: Parabolic reflector, 2: Radio wave reflective layer 3: Radio wave transparent layer, 4: Reinforcement layer Fig. 1

Claims (1)

[Claims] A radio wave reflective layer is formed by a conductive material made of a net or cloth-like material, and the concave curved surface of the radio wave reflection fI4Jll is covered with a radio wave transparent layer, while the convex back surface is integrally formed with a reinforcing layer of reinforced plastic. Features a long parabolic anti-corrosion