JP2001284958A - Paraboloidal antenna reflecting mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paraboloidal antenna reflecting mirror for irregularly reflecting sunlight and efficiently reflecting radio waves while having high transparency. SOLUTION: This reflecting mirror is a mold of metal meshes 11 and 12 and synthetic resins (the Fig. shows an expanded plan of one part of the paraboloidal antenna reflecting mirror and the synthetic resins are molded with a thickness in the direction of the depth of the Fig.). The metal meshes 11 and 12 are located on a focal side surface and on this focal side surface, there is at least ruggedness (the recessed parts 22 are shown by dotted lines in the Fig.) for generating irregular reflection in infrared areas while maintaining entire transparency. Further, it is preferable that the synthetic resin is transparent polyester resin and that the metal meshes 11 and 12 are stainless meshes of 15 to 20 mesh/inch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parabolic antenna reflecting mirror, and more particularly, to diffusely reflecting sunlight, which causes burning of a feed horn cap, on a focal-side surface, and
It relates to a nearly transparent parabolic antenna reflector.

[0002]

2. Description of the Related Art Generally, a parabolic antenna includes a parabolic antenna reflector having a paraboloid of revolution, a converter with a feed horn, and a feeder for fixing the converter with the feed horn at a focal point of the parabolic antenna reflector. It consists of a horn arm and a mount. The parabolic antenna reflector was made of a colored synthetic resin and was mostly opaque. Also, the feed horn is covered with a feed horn cap for waterproofing.

[0003] The feed horn cap of a parabolic antenna is a plastic molded product having a small thickness in order to transmit radio waves well and reduce loss of radio waves. As a result, the feed horn cap was weak against heat, and sunlight was reflected by the parabolic antenna reflector and focused on the surface of the feed horn cap, causing a drilling accident. Further, there is a problem that water enters from here, the LNB converter connected to the feed horn breaks down, and the reception becomes impossible.

Therefore, conventionally, in order to diffusely reflect sunlight, a matte paint is applied to the surface on the focal point side of the parabolic antenna reflector to reduce reflected light of sunlight.

[0005] When the matte paint is not applied to the focal-side surface, the corresponding surface of the synthetic resin molding die for molding the parabolic antenna reflector is processed so that the focal-side surface of the parabolic antenna reflector is processed. Was subjected to a satin finish, so that the sunlight was irregularly reflected. Furthermore, in order to improve the scenery and enhance indoor lighting, there has been a ground glass-like parabolic antenna reflector formed by molding a transparent resin using a synthetic resin molding die processed in the same manner as described above.

However, a parabolic antenna reflector made of a transparent resin and subjected to a satin finish is not very transparent, and has a problem that the interior becomes dark when installed on a handrail of a window or the like.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a parabolic antenna reflector having high transparency, diffusely reflecting sunlight and efficiently reflecting radio waves.

[0008]

The parabolic antenna reflecting mirror of the present invention is formed of a metal mesh and a synthetic resin.

The metal mesh is disposed on or immediately below the surface, and the surface has irregularities that cause irregular reflection in at least the infrared region while maintaining the overall transparency. The surface is preferably a radio wave reflection surface side surface. Further, a planar parabolic antenna may be used.

Further, the synthetic resin is preferably a transparent polyester resin, and the metal mesh is preferably 15-20.
A mesh / inch stainless steel mesh is preferred.

A parabolic antenna is constituted by the parabolic antenna reflector, a converter with a feed horn, a feed horn arm for fixing the converter with the feed horn at the focal point of the parabolic antenna reflector, and a mount. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of a parabolic antenna reflector according to the present invention will be described.

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. In the drawing, the entire shape of the parabolic antenna reflector is not shown, and the detailed structure is shown in an enlarged manner. Accordingly, a similar structure continues in the vertical and horizontal directions of FIG. 1, and a similar structure continues in the horizontal direction of FIGS. FIG.
The dotted line shown in FIG. 1 shows a gentle depression on the surface, and shows that the central portion 22 surrounded by the dotted line is slightly depressed from the surroundings. In FIG. 3, sunlight incident in parallel, and transmitted light and reflected light of the sunlight are indicated by arrows.

The parabolic antenna reflecting mirror of the present invention is formed of a metal mesh composed of metal wires 11 and 12 and a synthetic resin 20 which is arranged and molded on the focal side surface.

By selecting a metal mesh with a mesh size of about 15 to 20 mesh / inch, a 12 GHz band radio wave can be efficiently reflected. Further, by using stainless steel, it is possible to eliminate a sense of discomfort regarding transparency. In addition, the stainless metal mesh portion exposed from the synthetic resin 20 is not likely to be corroded, and can be designed with high durability.

As the synthetic resin 20 to be used, a thermosetting or thermoplastic synthetic resin can be used. Examples of the material include a transparent polyester resin.

A method of manufacturing a parabolic antenna reflector according to the present invention will be described with reference to the drawings. The molding method of the synthetic resin may be an injection molding method or a method based on a conventional technique.

A metal mesh serving as a radio wave reflecting surface is held in a state where the metal mesh is disposed on a focal side surface of a parabolic antenna reflector in a mold, and the mold is filled with a synthetic resin. At this time, the filling pressure of the synthetic resin is set slightly lower. When the synthetic resin is solidified, the synthetic resin in the portion of the metal mesh close to the metal wire hardens quickly, and the synthetic resin in the central portion of the grid slows down hardening.

In particular, when a synthetic resin such as a polyester resin having a large shrinkage of 1.5 to 2.5% is selected, the resin is well dented and the effect is large.

Since the synthetic resin is solidified in this surface state, the focal-side surface of the parabolic antenna reflector has an irregular shape having fine concave portions as many as the number of the metal meshes.
Although the synthetic resin film having a small thickness is covered on the surface of the stainless wire, even if the synthetic resin having the small thickness is broken, the material of the wire is stainless steel, the wire is hardly corroded, and the performance of reflecting radio waves does not deteriorate. Specifically, if the antenna diameter is 500
The thickness of the parabolic antenna reflector of up to 600 mm is 6.0.
mm and the diameter of the metal wire should be 0.5 mm.

Even if the parabolic antenna reflector manufactured in this way is erroneously aimed at the sun at the time of installation reception or adjustment, etc., it is possible to reduce the number of sunlight 1 to 3 incident on the focal side surface of the parabolic antenna reflector. Mainly infrared light is scattered on the surface as shown in FIG. For example, since the sunlight 1 is incident on a surface portion having a normal in the same direction as the radio wave reflecting surface of the parabolic antenna reflector, the sunlight 1 is reflected toward the focal point of the parabolic antenna reflector similarly to radio waves. The sunlight 2, 3 is incident on a surface having a normal in a direction different from that of the radio wave reflection surface, and therefore does not reflect toward the focal point. Also, part of the infrared light is transmitted through the transparent parabolic antenna reflecting mirror, so that very little infrared light is reflected at the focal point, and most of the visible light is transmitted, so that transparency is maintained.

Therefore, the parabolic antenna reflecting mirror of the present invention having a very small, fine and smooth uneven shape is suitable for irregularly reflecting sunlight near infrared rays while maintaining the overall transparency. Furthermore, the parabolic antenna reflector of the present invention has a characteristic effect that the transparency is hardly impaired, in contrast to the conventional parabolic antenna reflector having only a low transparency when a satin finish is applied.

As the synthetic resin, it is preferable to select a synthetic resin having high transparency which allows a large amount of infrared light and visible light contained in sunlight to pass therethrough.

It should be noted that the present invention is not limited by the embodiment shown for explanation.

[0025]

The parabolic antenna reflector of the present invention has high transparency, can reflect radio waves efficiently, and can be directed to the sun by mistake during installation reception or adjustment.
The reflected light of the incident sunlight does not focus on the focal point of the radio wave reflecting surface of the parabolic antenna reflector. Therefore, the feed horn positioned at the focal point can be prevented from being burned out, and the room can be kept bright even if it is installed on a handrail of a window, so that the scene is not spoiled.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a parabolic antenna reflecting mirror of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

[Explanation of symbols]

 1, 2, 3 Sunlight 11, 12 Metal wire 20 Synthetic resin 21 Convex part 22 Concave part

Claims (4)

[Claims] 1. A parabolic antenna reflector formed of a metal mesh and a synthetic resin, wherein the metal mesh is disposed on a surface or directly below the surface, and the surface has at least an infrared region while maintaining the overall transparency. A parabolic antenna reflector characterized by having irregularities that cause irregular reflection of light. 2. The parabolic antenna reflector according to claim 1, wherein the synthetic resin is a transparent polyester resin. 3. The parabolic antenna reflector according to claim 1, wherein the metal mesh is a stainless steel mesh of 15 to 20 mesh / inch. 4. A parabolic antenna reflector according to claim 1, a converter with a feed horn, and a feed horn for fixing the converter with the feed horn at a focal point of the parabolic antenna reflector. A parabolic antenna consisting of an arm and a mount.