JPS6049363B2 - Combination corner reflector - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in radar reflectors.

In order to improve so-called radar visibility, radar reflectors combined with metal conductors have been installed on buoys, small ships, etc. that have a weak reflection intensity against radar radio waves. In particular, since FRP small boats and buoys have been frequently used recently, it has become common sense to equip them with radar reflectors for the purpose of ensuring safe navigation at sea. These conventional radar reflectors
A corner reflector is constructed by combining metal veneers in a triangular pyramid shape as shown in the figure, or a corner reflector is constructed by combining three circular veneers with the same radius in a mutually orthogonal cross shape as shown in Figure 2. As shown in FIG. 3, five to eight reflectors are arranged in a ring with the openings facing outward. (The arrows in Fig. 1 indicate the direction of radio wave input and J reflection.) It is well known that both have high reflection efficiency and have extremely large reflection effects even though they are small structures. For example, one side is 30c
The above-mentioned corner reflector of m has a reflection area l5 directly facing the direction of arrival of radar radio waves! It has a reflective effect comparable to that of a flat metal plate. This is because the above-mentioned reflector has directivity in the direction in which radio waves are reflected, and is configured to have strong directivity, so even if it is small, it can achieve the same reflection effect as a large metal plate. be.
However, it is technically difficult to arrange these corner reflectors evenly on all four sides, and it is even more difficult to arrange the corner reflectors evenly on all four sides.In addition, in order to provide all-around directionality to human-radiated radio waves, the openings of the reflectors must be arranged as shown in Figure 3. The purpose of sawing can be achieved by arranging 5 to 8 pieces outward in a ring, but the assembly is complicated and requires many man-hours, and it takes a lot of technology to arrange them in an accurate arrangement. There were drawbacks, such as a longer time and a larger shape. The corner reflector shown in Figure 2, which is constructed by combining circular single plates in a cross shape, has eight openings. If, the second
As shown in Figure b and its plan view c, although the horizontal directivity characteristics were good, it had the disadvantage of being biased in two directions. The present invention
It is a combination of four corner reflectors attached around a mounting base, and each corner reflector has a directional characteristic in the horizontal direction, and is oriented equally in all four directions.
This invention relates to a combination corner reflector that is easy to manufacture, small and lightweight, and by stacking two sets of the same as required, a combination corner reflector with omnidirectional directional properties can be easily obtained.

The contents will be explained in detail below based on the embodiment shown in the drawings.
Figure 4a is a front view of the mounting seat ± for mounting the corner reflector.
b is a plan view thereof, and c is a perspective view thereof.

As shown in the figure, the mounting seats ± are perpendicular to each other passing through the center of a column (in this example, a cylindrical column)! Four corner reflector bodies 1 (Fig. 8a -d
(Reference) It consists of four mounting surfaces ↑ divided into three equal parts by turning them 90 degrees in the same direction around the center of the column. The corner reflector body cutter is attached to this mounting surface as shown in FIG. In the illustrated example, the corner reflector element body shown in FIG. 8a uses a corner reflector element body in which the reflective element plate is square. That is, the vertical surface 3'' of the corner reflector body 1 is brought into contact with the mounting surface or vertical surface 2'' of the mounting seat ±, and the inclined surface 3'' of the corner reflector body 1 is brought into contact with the inclined surface of the mounting surface λ. 2″,
In addition, the ridgeline 3″ of the corner reflector body is attached to the mounting surface 2.
By attaching the corner reflector element body to each of the four mounting surfaces 1 as described above, each corner reflector is attached as shown in Fig. 5A and b. A corner reflector element is cut in which one surface of the three reflecting plates that make up the element is 90 degrees to each other and perpendicular, and the ridge lines of the other two sides are horizontal and adjacent in the same rotation direction. A combination corner reflector is constructed, which is arranged oppositely behind the vertical surface 3'' of.

With this configuration, the reflected waves of the incident radio waves face directly in the horizontal direction, as shown by the chain lines in Fig. 5A and b, and exhibit four radio wave reflection characteristics when viewed from the vertical axis. The main beams form a four-leaf clover-like equally spaced pattern in the horizontal plane.

Figure 6 A, b, and c are columnar bodies (in this example, cylindrical columnar bodies)
Shift the mounting surface 1 by 45 degrees in the opposite direction.
A front view, a plan view, and a perspective view of a mounting seat configured at eight locations are shown. If the corner reflector body 3 is attached to this mounting seat V in the same manner as described above, the 8 corner reflector bodies 3 will be attached to 4 pieces above and below the mounting seat JB, as shown in Figure 7A and b. They are mounted 45 degrees apart from each other. According to this configuration, the radio wave reflection characteristic of the opening of the corner reflector is the seventh
As shown in the chain diagrams in figures A and b, 4
They form a symmetrical pattern of eight petals, facing outward at 5 degree intervals. , As a result, the reflected beam viewed from the vertical axis has an ideal state of directionality all around the horizontal plane. Figures 9 and 10
The figure shows the combined corner reflector shown in Figures 5 and 7 housed in a cylindrical container 4.4'' (the corners may be cut off as shown in chain lines) that has low loss against radar waves, such as polyethylene resin. show something

By doing so, it is possible to obtain a compact, easy-to-handle, weather-resistant and stable reflector.

When placed in such a container, the material constituting the corner reflector can be an extremely thin metal plate, such as aluminum foil pasted on a thin resin plate, making it economical and extremely lightweight. be able to. In the above, the corner reflector body cut is 4 as shown in Fig. 8B and c.
A corner reflector body constructed using a divided circular reflective plate or an isosceles triangular reflective plate may be used, and when housed in a cylindrical container 4, 4″, the inner peripheral surface of the cylindrical container , the eighth part is brought into contact with the protruding outer peripheral edge of the reflective plate.
If a corner reflector body as illustrated in FIG. d is used, the space inside the container can be effectively utilized, the radio wave reflection area can be widened, and the stability of the corner reflector can be improved.

According to the present invention, since the joint surface between the corner reflector body and the mounting seat is wide and has two joint surfaces, a vertical surface and an inclined surface, the joint between the two can be made sufficiently strong by simple adhesive work. It can be done. In addition, if the mounting seat is molded from resin or closed-cell foamed resin, machining is easy, an accurate mounting surface can be easily obtained, and it is lightweight, making it possible to use a combination corner reflector. It is extremely easy to arrange the reflector in a planned ideal arrangement, and it has the feature that it is easy to obtain a lightweight and compact combination reflector with good radio wave reflection characteristics. Although the above has been described in detail as a combination corner reflector exclusively for radar radio waves, the same effects as radio waves can be expected for other applications such as sound waves and light waves.

For example, it can be used for omnidirectional signs installed to mark intersections on roads, etc., for the purpose of strongly reflecting the beam light from automobile headlamps. In this case, the corner reflector element is composed of an optical plane mirror, and the cylindrical container covering the combined corner reflector is made of a transparent plastic material. If the purpose is to obtain colored reflected light for incident white light, the outer container may be colored and made transparent, or the optical plane mirror serving as the element of the corner reflector may be colored.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional corner reflector, Fig. 2a is a perspective view of a conventional corner reflector combining circular veneers,
Figures 2B and c are explanatory diagrams showing the direction of radio wave reflection, Figure 3 is a front view of a conventional all-around directional corner reflector, and Figures 4A, b, and c are front views and plane views of the mounting seat ±. Figures and perspective views, Figure 5 A and b are the corner reflector element 1 on the mounting seat ↓
Figure 6 A, b, c is a front view, plan view, and perspective view of mounting seat 1B, Figure 7 A, b
8A to 8D are perspective views of the corner reflector element 1, and FIGS. 9 and 10 show the combination housed in a cylindrical container. A partially cutaway front view of the corner reflector is shown. ±, 1 O...Mounting seat, I...Mounting surface,
2″・・・Vertical surface, 2″・・・Slanted surface, 2
゛''...Ridge line, vertical...Corner reflector body, 3''...Vertical surface, 3''...Inclination/slope, 3''''''...・・・Ridge line, 4,4″・・・・・・
cylindrical container.

Claims (1)

[Claims] 1. In a column, there are four mutually orthogonal vertical planes that pass through the center, and a horizontal plane that is orthogonal to each of the vertical planes.
The mounting surfaces for the corner reflector element device, which are constructed by four inclined surfaces with an inclination of A combination corner reflector characterized in that two of the three back surfaces are attached to a vertical surface and an inclined surface of a mounting seat. 2. Claim 1, which is connected around a mounting seat configured by arranging two sets of four corner reflector mounting surfaces at the top and bottom of a column, shifted by 45 degrees in opposite directions.
Combination corner reflector as described in section. 3 Claim No. 1 in which a corner reflector element body composed of a square flat reflective plate is a unit corner reflector.
The combination corner reflector according to item 1 or 2. 4. The combination corner reflector according to claim 1 or 2, wherein the corner reflector element is a unit corner reflector made of a reflective element made of a quarter-divided circular flat plate. 5. The combination corner reflector according to claim 1 or 2, wherein a corner reflector element body constituted by a right-angled isosceles triangular flat reflective plate is used as a unit corner reflector. 6. The combination corner reflector according to claim 1 or 2, which is housed in a cylindrical container.