JPS6017244B2 - Manufacturing method of radar reflector - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a radar reflector.

In general, in order to improve so-called radar visibility, radar J-flexors, which are combined with metal conductors, have been installed on buoys, small ships, etc., which have a weak reflection strength against radar radio waves.

Especially recently, small FRP boats and buoys have been used frequently, and it has become common sense to equip them with radar reflectors for the purpose of ensuring safe navigation at sea. These conventional radar reflectors are either corner reflectors constructed by combining single metal plates in the shape of a triangular pyramid, or they include a reflective plate made of metal or the like on one side of a spherical radio wave dielectric and utilize changes in speed when passing through the dielectric. , those that refract and reflect radio waves are generally used.

It is well known that both types have good reflection efficiency and have extremely large effects even though they are small structures.

For example, a corner reflector with a side of 30 mm or a dielectric reflector with a diameter of 2 mm can have a reflection effect equivalent to that of a flat metal plate with a reflective area of 10 mm placed directly in the direction of arrival of radar radio waves. have.

This is because the reflector described above 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 flat metal plate. It is. However, both methods have the disadvantage that the manufacturing method is complicated and expensive. In other words, in the case of a corner reflector, metal veneers are assembled into one piece using methods such as welding or riveting, but this requires a lot of man-hours and requires advanced techniques to construct an accurate reflector. It required technology.

Furthermore, the method of providing a reflective plate made of metal or the like on one side of the spherical dielectric body is also difficult to manufacture and requires high material costs, making it difficult to make it widely available. The present invention provides a flat plate having a metal surface with a notch cut to the center, and by providing folding lines that form a 900° angle starting from the end of the notch, and bending the flat plate at 900° along the folding lines. The corner reflector is configured to have three surfaces perpendicular to the angle of reflection.This eliminates the conventional deficiencies and makes it possible to manufacture a corner reflector with an accurate reflection angle extremely easily and economically. This is how it was done.

The contents will be explained in detail below according to the embodiments shown in the drawings.

1A to 1D show a type of corner reflector constructed by making a notch in the center from one side along the diagonal line of a square plate, and FIGS. A corner reflector in which a flange part can be formed is shown, and FIGS. 3A to 3D show a corner reflector constructed by making a cut from the periphery to the center of a circular flat plate, and in FIG. 4, A to D are square reflectors. An example of a corner reflector constructed by making a notch from the center of one side of a flat plate is shown. In the example of FIG. 1, along the diagonal line lb of a square flat plate 1 made of a metal plate such as an aluminum plate,
Make a cut 3 in the center of the board from one side as shown in Figure A.

Next, origami la and lb are provided along the diagonal.

Next, as shown in Figures B and C, if you bend it at an angle of exactly 90o at the fold lines la and lb, it will be in the state shown in Figure C, and the edge 3
A is integrally fixed to the diagonal line lc by welding or the like. Thus,
One corner reflector body is completed.

As a result, the equilateral triangular protruding piece protruding to the outside of the corner reflector body constitutes the mounting piece ld of the corner reflector. As shown in Figure D, the two corner reflector bodies constructed in this manner are symmetrically connected with the mounting pieces ld back to back to form a set of IJ reflectors, with a shaft 2 provided in the center. .

If you rotate this, you can get a very strong flexor.

Note that the notch 3 is shown as a straight slit in the diagonal direction in this example, but depending on the shape of the mounting piece ld, the notch 3 may be made hollow, or may be a V-shaped notch. In addition, as shown in FIG. 2, a notch 3' is made in the edge so that a flange 4 can be formed therein so that the cut edge 3a can be easily attached (FIG. 2A). reference).

Thereafter, the reflector body is constructed in the same manner as in the example shown in FIG.
The flange 4 can be fixed to the mounting piece ld by spot welding or rivets, allowing for an accurate and robust finish (see FIGS. 2B, C, and D). In the examples in Figures 3 and 4, a circular or square metal plate is used, and the incision direction is different from the examples in Figures 1 and 2, and the incision is made from the center of one side to the center of the plate. An example of a corner reflector configured with
It is similar to FIG.

In addition, although the above-mentioned procedure showed the structure using a metal flat plate, it goes without saying that it may be constructed using a conductive plated plastic plate.

As described above, according to the present invention, a corner reflector is constructed by making a notch in one flat plate, providing a 90° fold line from the notch as a starting point, and bending at 900° along this fold line. By using a method that is extremely easy to manufacture, it is possible to provide a high-performance radar reflector with accurate angle at a low cost. As shown in each figure, a corner reflector with symmetrically arranged Qin bodies forms a two-blade windmill and rotates easily even in a light breeze. Of course, it can be rotated by power, but by rotating it, it becomes non-directional with respect to the direction of arrival of radio waves outside the reflector, and the effect is similar to that of arranging countless fixed reflectors around a shaft. can have. Moreover, if the shaft is supported by a gyro type, it becomes possible to use it as an all-sky directional reflector.

[Brief explanation of drawings]

Figures 1A to 1D show the construction order of a corner reflector made by making cuts in the diagonal direction of a square flat plate with a metal surface, and Figures 2A to 2D show the construction order of a corner reflector that can be constructed by making cuts in the diagonal direction of a square flat plate with a metal surface, and Figures 2A to D show that a flange part can be provided at the edge of the cut. Figure 3 shows the construction order of a corner reflector constructed by making a cut in a circular flat plate, and Figure 4 shows the construction order of a corner reflector made by making a cut from the center of one side of a square plate. The configuration order of the corner reflectors is shown. 1 is a flat plate, la and lb are fold lines, lc is a diagonal line, 2 is a shaft, 3 and 3' are notches, 3a and 3a' are edges, and 4 is a flange. Matsuri'zu (A) Ta'zu (B) Diagram 1 (C) Diagram '(P) Diagram 2 (A) Diagram 2〈B) Shigenozu (C) Z diagram (〇) Brother 3 diagram (A) Figure 3 (8) Figure 3 (C) Figure 3 (〇) Figure 4 “A” Figure 4 (8) Figure 4 (C) Figure 4 (〇)

Claims (1)

[Claims] 1. On a flat plate with a metal surface with a notch made to the center, create folding lines that form a 90° angle to each other starting from the edge of the notch, and fold the flat plate at 90° along the folding lines to make the flat plate orthogonal to each other. The two corner reflectors are connected back to back to each other by a flat plate that is a continuous extension of one surface of the corner reflector, and a vertical rotation axis is provided in the center. A method for manufacturing a radar reflector.