Radio wave reflector

Abstract

To provide a radio wave reflector that allows for adjustment of the direction of radio wave reflection. [Solution] The radio wave reflector 11 of the present invention comprises a radio wave reflector 20 having a reflective surface 21a that reflects radio waves, and an angle adjuster 30 attached to the radio wave reflector 20 for orienting the reflective surface 21a in any direction.

Description

Technical Field

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[0001] The present invention relates to a radio wave reflector.

Background Art

[0002] In mobile phones and wireless communications, radio waves in a frequency band of about 3 GHz or more and 300 GHz or less, called centimeter waves and millimeter waves, are used. Such radio waves with a short wavelength have strong directivity. If there is an obstacle between the transmitting antenna and the receiving antenna, it is difficult for the radio waves to bend around, and it is difficult for the radio waves to reach the receiving antenna. Therefore, in order to make the radio waves reach the dead corner where the radio waves cannot reach, a reflector is provided on the surface of a building such as the wall, floor, ceiling, pillar, etc. of the building (hereinafter referred to as "wall, etc.").

[0003] As the reflector, there is one that reflects radio waves by specular reflection in which the incident angle and the reflection angle of the radio waves are the same. In addition, Patent Document 1 proposes a reflector designed so that the incident angle and the reflection angle of radio waves are different.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] These reflectors are so-called passive reflectors in which the reflection angle is determined with respect to the incident angle of radio waves. In a passive reflector, the reflection angle of radio waves is determined by the pattern of reflection elements included in the reflector. Therefore, it is necessary to design the pattern of the reflection elements according to the reflection angle, which is a so-called one-angle-one-design, and a mold is required for each design.

[0006] To install a reflector on a wall or other surface, the angle of the wall and the desired direction of radio wave reflection must be determined in advance, and a reflector with an appropriate reflection angle corresponding to these angles and directions must be designed. However, the actual reflection angle of the reflector may deviate from the design value, or the direction of radio wave reflection may shift from the desired direction during installation at the site, resulting in an angular deviation in the direction of radio wave reflection by the reflector. Since the reflection angle of passive reflectors cannot be adjusted, the reflector will be installed with an angular deviation, leading to the problem of insufficient reflection of radio waves. It is also conceivable to prepare reflectors with different reflection angles to accommodate angular deviations, but this requires designing molds and reflective element patterns for each reflection angle, which is time-consuming.

[0007] This invention was made in view of the above-mentioned problems, and aims to provide a radio wave reflector that can adjust the direction of reflection of radio waves. [Means for solving the problem]

[0008] To achieve the above objectives, the present invention encompasses the subject matter described in the following sections.

[0009] Item 1: A radio wave reflector having a reflective surface that reflects radio waves, An angle adjustment device attached to a radio wave reflector for orienting the reflective surface in any direction, A radio wave reflector having the following properties.

[0010] Item 2: Further comprising a fixing plate connected to the radio wave reflector and attached to the object to be installed, The radio wave reflector according to item 1, wherein the angle adjustment device adjusts the inclination angle of the reflective surface of the radio wave reflector with respect to the fixing plate.

[0011] Item 3: The radio wave reflector according to item 1 or 2, wherein the radio wave reflector is transparent.

[0012] Item 4: The radio wave reflector according to Item 2 or Item 3 by reference, wherein the fixing plate is transparent.

[0013] Item 5: The radio wave reflector includes a transparent glass or a transparent synthetic resin substrate, The fixed plate includes a transparent glass or a transparent synthetic resin substrate, and the radio wave reflector according to Item 3 or 4.

[0014] Item 6: The radio wave reflector includes a radio wave reflection film having the reflection surface, and a movable plate that supports the radio wave reflection film on one surface, The angle adjuster is attached to the movable plate, and the radio wave reflector according to any one of Items 1 to 5.

[0015] Item 7: The fixed plate includes an adhesive layer on the mounting surface attached to the installation object, and the radio wave reflector according to Item 2.

[0016] Item 8: The radio wave reflector reflects radio waves at an angle different from the incident angle, and the radio wave reflector according to any one of Items 1 to 7.

[0017] Item 9: The reflection angle of the radio wave of the radio wave reflector is set to 1 degree or more and 20 degrees or less, or 70 degrees or more and 89 degrees or less, and the radio wave reflector according to any one of Items 1 to 8.

Effect of the Invention

[0018] According to the present invention, it is possible to provide a radio wave reflector capable of adjusting the reflection direction of radio waves.

Brief Description of the Drawings

[0019] [Figure 1] It is a side view showing the overall schematic configuration of a radio wave reflector according to an embodiment of the present invention. [Figure 2] It is a plan view showing the schematic configuration of a radio wave reflector, and is a view of the radio wave reflector in an open state. [Figure 3] It is a perspective view showing the overall schematic configuration of a radio wave reflector according to an embodiment of the present invention. [Figure 4] It is a side view showing another embodiment of the radio wave reflector. [Figure 5] It is a perspective view showing another embodiment of the radio wave reflector. [Figure 6] It is a perspective view showing another embodiment of the radio wave reflector, (A) is a view of the radio wave reflector in a closed state, and (B) is a view holding a predetermined tilt angle. [Figure 7] It is a side view showing another embodiment of the radio wave reflector. [Figure 8] It is a side view showing another embodiment of the radio wave reflector. [Figure 9] It is a view for explaining the direction of reflecting radio waves in a state where the radio wave reflector is attached to the installation object.

Embodiments for Carrying out the Invention

[0020] (Structure of Radio Wave Reflector 11) An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 9, the radio wave reflector 11 is installed on the installation surface 110a of the installation object 110 which is the surface of a building such as a wall, floor, ceiling, column, etc. (hereinafter referred to as "wall, etc.") of the building, and reflects the radio waves output from the radio wave source 100. As shown in FIGS. 1 to 3, the radio wave reflector 11 includes a radio wave reflecting plate 20 having a reflecting surface 21a for reflecting radio waves, an angle adjuster 30 attached to the radio wave reflecting plate 20 for directing the reflecting surface 21a in an arbitrary direction, and a fixing plate 40 connected to the radio wave reflecting plate 20 by the angle adjuster 30.

[0021] The shape of the radio wave reflector 11 in plan view is not limited, but in this embodiment it is preferably square, with a side length of 20 cm or more and 400 cm or less. Radio waves with frequencies of 3 GHz or more and 300 GHz or less are attenuated with distance, but in order to reflect with sufficient intensity at all points within a practical distance from the radio wave source 100, it is preferable that the side length be 20 cm or more. There is no particular upper limit to the side length, but from a manufacturing standpoint it is preferably 400 cm or less. The overall shape of the radio wave reflector 11 is not limited to a square, but may be a rectangle, or a polygon such as a triangle, pentagon, or hexagon, in which case the length of the shortest side is set to 20 cm or more and 400 cm or less. Alternatively, the shortest distance between a vertex and the opposite side, or the shortest distance between a side and the opposite side, may be set to 20 cm or more and 400 cm or less. Furthermore, if the overall shape of the radio wave reflector 11 is circular, the diameter is set to 20 cm or more and 400 cm or less. If the overall shape of the radio wave reflector 11 is elliptical, the minor axis is set to be between 20 cm and 400 cm. If the overall shape of the radio wave reflector 11 is sector-shaped, the length of the shorter arc or radius is set to be between 20 cm and 400 cm. The shape and size of the radio wave reflector 11 are appropriately selected according to the manner in which the radio wave reflector 11 is used.

[0022] The radio wave reflector 20 rotates relative to the fixed plate 40 using the hinge shaft 31 of the angle adjustment device 30 as a pivot point. In this specification, as shown in Figure 1, the direction in which the radio wave reflector 20 approaches the fixed plate 40 is called the inner direction, and the direction in which it moves away from the fixed plate 40 is called the outer direction. Also, as shown in Figures 1 and 2, in a plan view, the direction in which the side of the rectangular fixed plate 40 on which the angle adjustment device 30 is provided extends is called the Y direction, the direction perpendicular to the Y direction is called the X direction, and the direction perpendicular to both the X and Y directions is called the Z direction. The drawings are used to explain the radio wave reflector 11 and do not show actual dimensions. Also, the X, Y, and Z directions do not need to be aligned with the horizontal and vertical directions.

[0023] (Fixed plate 40) The fixing plate 40 is a rectangular plate-shaped member and is made of transparent glass or a transparent synthetic resin substrate. The fixing plate 40 has sufficient strength to which the angle adjustment device 30, described later, can be screwed in. In this specification, "transparent" means that the other side is visible when viewed from one side, and includes translucency. It means that the total light transmittance in a D65 standard light source is 65% or more. Furthermore, "transparent" also includes being colored as a whole. The total light transmittance of the fixing plate 40 and the radio wave reflector 20 may be 80% or more, or 95% or more.

[0024] The fixing plate 40 is attached to the mounting surface 110a (Figure 9) of the object 110 on which the radio wave reflector 11 is to be installed. The lower mounting surface 40b of the fixing plate 40 may be provided with an adhesive layer 43 for bonding to the mounting surface 110a. The adhesive layer 43 is made of an adhesive. The adhesive layer 43 is transparent and has a size corresponding to the fixing plate 40 in a plan view. Examples of adhesives include, but are not limited to, synthetic resins such as acrylic resin, silicone resin, and polyvinyl alcohol resin, or rubber adhesive sheets. In this embodiment, the thickness of the adhesive layer 43 is set to 150 μm, but is not limited to this.

[0025] In this embodiment, the length of the fixing plate 40 in the X and Y directions is 400 mm, and the thickness (the shortest distance between the outer surface 40a and the mounting surface 40b) is 2 mm, but it is not limited to these. The shape of the fixing plate 40 may be a shape that conforms to the shape of the radio wave reflector 11 in a plan view as described above.

[0026] (Radio wave reflector 20) The radio wave reflector 20 includes a transparent radio wave reflective film 21 having a reflective surface 21a, and a movable plate 22. The movable plate 22 is a plate-shaped member with a rectangular planar shape, having an inner surface 22b and an outer surface 22a, and is made of transparent glass or a transparent synthetic resin substrate. In this embodiment, the movable plate 22 is made of the same size, thickness (shortest distance between the inner surface 22b and the outer surface 22a), and material as the fixed plate 40, but the movable plate 22 and the fixed plate 40 may be of different sizes, thicknesses, and materials. The movable plate 22 may be formed to be larger than the fixed plate 40 in a plan view, as long as the fixed plate 40 can support the radio wave reflector 11.

[0027] A radio wave reflective film 21 is attached to the outer surface 22a of the movable plate 22 by means of an adhesive layer (not shown), for example. The radio wave reflective film 21 may be attached to the entire outer surface 22a of the movable plate 22, or it may be attached to only a part of the outer surface 22a. In this embodiment, the radio wave reflective film 21 is rectangular in shape, with its rectangular sides aligned along the X and Y directions, and the radio wave reflective film 21 is not provided in the area of ​​the outer surface 22a corresponding to the location where the angle adjustment device 30 is attached.

[0028] The radio wave reflective film 21 may have a conductor (not shown) formed in a predetermined pattern on the outer surface of a resin layer (not shown), and may be flexible. Since radio waves are reflected by the conductor, the side of the resin layer on which the conductor is provided becomes the reflective surface 21a. The radio wave reflective film 21 may have a protective layer covering the conductor to protect it. If a protective layer is provided, the surface of the protective layer may be referred to as the reflective surface 21a. Depending on the pattern of the conductor, the radio wave reflective film 21 reflects radio waves by "specular reflection" or "biased reflection" (described later). The radio wave reflective film 21 is transparent, and its thickness is preferably set to 1.0 mm or less, and more preferably to 0.2 mm or less. The radio wave reflective film 21 does not bend when supported by the movable plate 22, and the reflective surface 21a remains flat.

[0029] (Angle adjuster 30) The angle adjustment device 30 connects the radio wave reflector 20 and the fixing plate 40, and adjusts the inclination angle β of the reflective surface 21a of the radio wave reflector 20 relative to the fixing plate 40. By adjusting the inclination angle β, the reflective surface 21a can be directed in any direction. The inclination angle β is the angle between the outer surface 40a of the fixing plate 40 and the reflective surface 21a of the radio wave reflector 20 in a side view, as shown in Figure 1. The angle between the outer surface 40a of the fixing plate 40 and the reflective surface 21a is the angle between l2 and l3 when lines l2 and l3 are drawn perpendicular to the intersection line l1, passing through a point on the line l1 of the plane containing the outer surface 40a of the fixing plate 40 and the plane containing the reflective surface 21a, respectively, on the outer surface 40a of the fixing plate 40 and the reflective surface 21a. The direction in which the reflective surface 21a faces is the direction in which the normal of the reflective surface 21a extends.

[0030] The tilt angle β is set to be between 0 degrees and 180 degrees. A tilt angle β of 0 degrees means that the reflective surface 21a of the radio wave reflector 20 and the outer surface 40a of the fixed plate 40 are parallel. A tilt angle β of 180 degrees includes the tilt angle β when the mounting surface 40b of the fixed plate 40 is placed on a horizontal surface and the radio wave reflector 20 is rotated outwards, causing the radio wave reflector 20 to contact the horizontal surface and unable to rotate further. Depending on the thickness of the fixed plate 40, the movable plate 22, and the radio wave reflective film 21, the angle between the outer surface 40a of the fixed plate 40 and the reflective surface 21a may exceed 180 degrees in the aforementioned state, but a tilt angle β of 180 degrees includes this state.

[0031] In other words, the reflective surface 21a of the radio wave reflector 20 can rotate between a position where the reflective surface 21a and the outer surface 40a of the fixing plate 40 are parallel, and a position where, when the mounting surface 40b of the fixing plate 40 is placed on a horizontal surface and the radio wave reflector 20 is rotated outward, the radio wave reflector 20 comes into contact with the horizontal surface and cannot rotate any further.

[0032] The angle adjustment device 30 can be manually applied by an operator without the use of tools to change the tilt angle β of the radio wave reflector 20, and when no external force is applied to the angle adjustment device 30, the position of any desired tilt angle β is maintained. A known configuration, such as a hinge, is used as the angle adjustment device 30. In this embodiment, a torque hinge (also called a free-stop hinge or torque hinge) is used, for example, model number B-1159 from Takigen Manufacturing Co., Ltd., model number B-532 from Joe Prince Takeshita Co., Ltd., model number TH-125 from Tochigi-ya, or model HES3D-120 from Sugatsune Kogyo Co., Ltd. The angle adjustment device 30 may be made of metal, but may also be made of synthetic resin and may be transparent.

[0033] As an example, the hinge, which is an angle adjustment device 30, has a hinge shaft 31 to which a pair of side plates 32A and 32B are rotatably attached. One side plate 32A is fixed to the outer surface 40a of the fixed plate 40 by fastening means such as screws, and the other side plate 32B is fixed to the inner surface 22b of the movable plate 22. In this embodiment, as shown in Figure 2, when the inclination angle β between the fixed plate 40 and the movable plate 22 is 180 degrees (also called the "open state"), two angle adjustment devices 30 are provided along the edge of the outer surface 40a of the fixed plate 40 that extends in the Y direction and the inner edge of the movable plate 22 that corresponds to this edge. The number of angle adjustment devices 30 is not limited, and there may be three or more angle adjustment devices 30, or one may be provided in the center.

[0034] (Reflection of radio waves) As shown in Figure 9, the reflected waves are received by the receiving unit 101. The radio wave source 100 is a communication device or the like that has a transmitting antenna capable of transmitting radio waves. The receiving unit 101 is a device capable of receiving radio waves. In this embodiment, the receiving unit 101 is a communication device that has a receiving antenna. Examples of communication devices include smartphones, mobile phones, tablet terminals, notebook PCs, portable game consoles, repeaters, radios, televisions, etc.

[0035] In this specification, the incident angle α1 is the angle between the direction of incidence when the incident wave is incident on the radio wave reflector 11 (for example, shown by arrow A1 in Figure 9) and the direction in which the normal to the reflective surface 21a of the radio wave reflector 11 extends (for example, shown by arrow A2 in Figure 9). The reflection angle α2 is the angle between the direction of reflection of the reflected wave (for example, shown by arrow A3 in Figure 9) and the normal to the reflective surface 21a. The normal is a straight line perpendicular to the tangent (or tangent plane) at the reflection point P.

[0036] The incident wave is reflected as a reflected wave by the radio wave reflector 11 at a reflection angle α2. Reflection at a reflection angle α2 that is the same as the incident angle α1 is called "specular reflection". Reflection at a reflection angle α2 that is a desired angle different from the incident angle α1 is called "biased reflection".

[0037] In the example in Figure 9, the incident angle α1 of the incident wave is 60 degrees. In specular reflection, the reflected wave is reflected in the direction of arrow A3, which is the same as the incident angle α1, i.e., the reflection angle α2 is 60 degrees in Figure 9. In the case of partial reflection, the reflected wave is reflected in the direction of arrow A2, which is the desired reflection angle α2, different from the incident angle α1, for example, the desired reflection angle α2 is 0 degrees in Figure 9.

[0038] When the radio wave reflector 20 of this embodiment performs biased reflection, the conductive pattern of the radio wave reflecting film 21 is designed so that the reflection angle α2 is 1 degree or more and 20 degrees or less, or 70 degrees or more and 89 degrees or less.

[0039] (summary) With the above configuration, by adjusting the inclination angle β of the reflective surface 21a of the radio wave reflector 20 using the angle adjustment device 30, the reflective surface 21a can be directed in any direction, and the direction of the radio waves reflected by the radio wave reflector 11 can be adjusted.

[0040] In this embodiment, since a fixing plate 40 is provided, the radio wave reflector 11 can be securely attached to the mounting surface 110a of the object 110 to be installed. As a mounting method, an adhesive layer 43 containing adhesive is used.

[0041] When the radio wave reflector 11 is composed of a radio wave reflector 20, an angle adjuster 30, and a fixing plate 40, making the radio wave reflector 20 and the fixing plate 40 transparent makes the area of ​​the radio wave reflector 11 excluding the angle adjuster 30 transparent in a plan view. Because the radio wave reflector 11 is transparent, even if the object to which it is installed 110 is transparent, such as a windowpane, the radio wave reflector 11 does not obstruct the view and has a good appearance. Furthermore, if the angle adjuster 30 is transparent, the entire radio wave reflector 11 can be made transparent.

[0042] The radio wave reflector 20 and the fixing plate 40 can be made transparent by including a transparent glass or transparent synthetic resin substrate.

[0043] Furthermore, since the radio wave reflective film 21 is supported by the movable plate 22, even if the radio wave reflective film 21 is flexible, the movable plate 22 keeps the reflective surface 21a flat, and by rotating the movable plate 22 to adjust the tilt angle β, the reflective surface 21a can be directed in any direction. In addition, if the angle adjustment device 30 were to be directly attached to the radio wave reflective film 21, there is a risk of damaging the radio wave reflective film 21, but since the angle adjustment device 30 is attached to the movable plate 22, the radio wave reflective film 21 will not be damaged by the attachment of the angle adjustment device 30.

[0044] If the radio wave reflective film 21 reflects radio waves specularly, the direction of reflection can be adjusted by orienting the reflective surface 21a in any direction using the angle adjustment device 30. If the radio wave reflective film 21 reflects radio waves skewly, the direction of reflection can be adjusted by combining the adjustment of the tilt angle β of the radio wave reflector 20 using the angle adjustment device 30 with the design of the reflection angle α2 of the radio wave reflective film 21.

[0045] In particular, the radio wave reflector 20 performs biased reflection, and by setting the reflection angle of the radio waves of the radio wave reflector 20 to 1 degree or more and 20 degrees or 70 degrees or more and 89 degrees, the direction of reflection of radio waves can be adjusted over a wide range.

[0046] (Other embodiments) Other embodiments are described below. Only configurations different from those in the embodiments shown in Figures 1 to 3 will be described. Since other configurations are the same as those in the embodiments shown in Figures 1 to 3, detailed descriptions of these other configurations are omitted. Furthermore, the other embodiments shown are denoted by reference numerals corresponding to their respective configurations.

[0047] In the embodiments shown in Figures 1 to 3, the radio wave reflector 20 is equipped with a movable plate 22, but it is not required to have a movable plate 22. In other words, the radio wave reflector 20 is composed of a radio wave reflective film 21, and the resin layer of the radio wave reflective film 21 may not be flexible and may hold the conductor flat. In this case, the angle adjuster 30 is attached to the inner surface of the resin layer of the radio wave reflective film 21.

[0048] In the embodiments shown in Figures 1 to 3, the radio wave reflector 11 is equipped with a fixing plate 40, but it is not necessary to have a fixing plate 40. In this case, the side plate 32A of the angle adjustment device 30 is not attached to the fixing plate 40, but directly to the installation surface 110a of the object to be installed 110. The inclination angle β is the angle formed between the installation surface 110a of the object to be installed 110 and the reflective surface 21a of the radio wave reflector 20. In this way, when the radio wave reflector 11 is composed of a radio wave reflector 20 and an angle adjustment device 30, the radio wave reflector 11 becomes transparent because the radio wave reflector 20 is transparent.

[0049] Furthermore, the radio wave reflector 11 does not necessarily have to include a fixed plate 40 and a movable plate 22 of the radio wave reflector 20. In this case, the side plate 32A of the angle adjustment device 30 is attached to the inner surface of the resin layer of the radio wave reflecting film 21, and the side plate 32B is attached to the installation surface 110a of the object to be installed 110. The inclination angle β is the angle formed between the installation surface 110a of the object to be installed 110 and the reflecting surface 21a of the radio wave reflector 20.

[0050] (Other embodiments) Figure 4 shows another embodiment of the present invention. In the embodiment shown in Figure 4, the mounting position of the angle adjuster 30 differs from that of the embodiments shown in Figures 1 to 3. In the side view of Figure 4, the pair of side plates 32A and 32B of the angle adjuster 30 are provided on one side surface 40c of the fixed plate 40 in the X direction (a surface perpendicular to the mounting surface 40b and the outer surface 40a) and on one side surface 22c of the movable plate 22 (a surface perpendicular to the inner surface 22b and the outer surface 22a). The thickness of the movable plate 22 and the thickness of the fixed plate 40 are long enough to mount the pair of side plates 32A and 32B of the angle adjuster 30.

[0051] (Other embodiments) Figure 5 shows another embodiment of the present invention. In the embodiment shown in Figure 5, the shape of the fixed plate 40 differs from that of the embodiments shown in Figures 1 to 3. The fixed plate 40 is a rectangular annular shape and has a space 41 in the center. The movable plate 22 is the same size as the fixed plate 40, and when the inclination angle β of the reflective surface 21a with respect to the fixed plate 40 is 0 degrees (hereinafter also referred to as the "closed state"), the upper surface of the space 41 is covered by the movable plate 22. If an adhesive layer 43 is provided on the lower surface of the fixed plate 40, the adhesive layer 43 is formed in an annular shape along the shape of the fixed plate 40. The fact that the central part of the fixed plate 40 is a space 41 makes it possible to reduce the weight of the radio wave reflector 11.

[0052] (Other embodiments) Figures 6(A) and 6(B) show other embodiments of the present invention. As shown in Figures 6(A) and 6(B), the fixed plate 40 is a rectangular annular shape and has a space 41 in the center. As shown in Figure 6(A), the movable plate 22 of the radio wave reflector 20 has the same shape as the planar shape of the space 41 and the same thickness as the space 41, and in the closed state, the movable plate 22 of the radio wave reflector 20 can be fitted into the space 41 of the fixed plate 40. As shown in Figure 6(B), the movable plate 22 of the radio wave reflector 20 may be removed from the space 41 of the fixed plate 40 and positioned at a predetermined inclination angle β. The movable plate 22 may be formed to be smaller than the space 41 of the fixed plate 40. In this way, by fitting the movable plate 22 into the space 41 inside the fixed plate 40, the overall thickness of the radio wave reflector 11 can be reduced, making it convenient for transport.

[0053] (Other embodiments) Figure 7 shows another embodiment of the present invention. In the embodiment of Figure 7, the radio wave reflector 11 further comprises a support plate 50 that supports the movable plate 22 relative to the fixed plate 40. Multiple fixed plate-side locking recesses 42 are formed on the outer surface 40a of the fixed plate 40 along the X direction, and each fixed plate-side locking recess 42 has a triangular cross-sectional shape and is provided along the entire length or a portion thereof in the Y direction. In addition, multiple movable plate-side locking recesses 23 are formed on the inner surface 22b of the movable plate 22 along the X direction, and each movable plate-side locking recess 23 has a triangular cross-sectional shape and is provided along the entire length or a portion thereof in the Y direction. The support plate 50 maintains the inclination angle β of the reflective surface 21a by locking its upper end with the movable plate-side locking recesses 23 and its lower end with the fixed plate-side locking recesses 42.

[0054] The inclination angle β of the reflective surface 21a is also maintained by the angle adjustment device 30, but by providing the support plate 50, the inclination angle β of the reflective surface 21a can be maintained even if a strong external force is applied that causes the radio wave reflector 20 to rotate. Furthermore, the inclination angle β of the reflective surface 21a can be adjusted by appropriately selecting the locking recess 23 on the movable plate side and the locking recess 42 on the fixed plate side to which the support plate 50 is locked.

[0055] The support plate 50 may be divided into multiple parts, and instead of the support plate 50, one or more support rods may be provided at both ends and in the center in the X direction.

[0056] (Other embodiments) Figure 8 shows another embodiment of the present invention. In the embodiment shown in Figure 8, multiple radio wave reflectors 20A and 20B are attached to the outer surface 40a of a single fixing plate 40, respectively, by angle adjusters 30. The number and position of the radio wave reflectors 20 attached to the fixing plate 40 are determined according to the object 110 on which the radio wave reflector 11 is to be installed.

[0057] In the embodiment shown in Figure 8, the fixed plate 40 may have a plurality of spaces 41. In this case, similar to the embodiment shown in Figure 5, the radio wave reflectors 20 may be attached to the fixed plate 40 so as to cover each of the spaces 41. Alternatively, similar to the embodiment shown in Figure 6, the radio wave reflectors 20 may be attached to the fixed plate 40 so as to fit the movable plates 22 into each of the spaces 41.

[0058] (Other embodiments) Furthermore, the radio wave reflector 11 may be equipped with fasteners. The fasteners are used to maintain a tilt angle β of 0 degrees, that is, a state in which the reflective surface 21a of the radio wave reflector 20 and the outer surface 40a of the fixing plate 40 are parallel. As fasteners, for example, catches such as arm catches, magnetic catches, ball catches, and resin catches, and latches such as push latches and magnetic latches can be used. In addition, a spirit level may be provided at any point on the fixing plate 40 for horizontally positioning the fixing plate 40.

[0059] Furthermore, the dimensions, materials, shapes, and relative arrangements of components described or shown in the drawings as embodiments are not intended to limit the scope of the present invention, but are merely illustrative examples. Expressions indicating that things are equal, such as "in a certain direction," "along a certain direction," "same," "identical," "equal," and "homogeneous," should not only indicate strictly equal states, but also states where tolerances or differences exist to the extent that the same function can be achieved. Expressions indicating triangular, quadrilateral, and circular shapes should not only indicate shapes in a geometrically precise sense, but also include shapes that include uneven parts, chamfered parts, etc., to the extent that the same effect can be achieved. Expressions such as "equipped," "possessed," "possess," "include," or "have" a single component are not exclusive expressions that exclude the existence of other components. "Parallel" and "orthogonal" mean substantially "parallel" and "orthogonal," and include not only strictly "parallel" and "orthogonal" states, but also states that include errors of a few degrees. [Explanation of Symbols]

[0060] 11. Radio wave reflector 20 Radio wave reflector 21 Radio wave reflective film 21a Reflective surface 22 Movable plate 30 Angle adjuster 40 Fixed plate 43 Adhesive layer 110 Objects to be installed β tilt angle

Claims

1. A radio wave reflector having a reflective surface that reflects radio waves, An angle adjustment device attached to a radio wave reflector for orienting the reflective surface in any direction, A radio wave reflector having the following properties.

2. The aforementioned radio wave reflector is further equipped with a fixing plate that is connected to and attached to the object to be installed, The radio wave reflector according to claim 1, wherein the angle adjustment device adjusts the inclination angle of the reflective surface of the radio wave reflector with respect to the fixing plate.

3. The radio wave reflector according to claim 1, wherein the radio wave reflector is transparent.

4. The radio wave reflector according to claim 2, wherein the fixing plate is transparent.

5. The aforementioned radio wave reflector includes a transparent glass or transparent synthetic resin substrate, The radio wave reflector according to claim 2, wherein the fixing plate includes a transparent glass or transparent synthetic resin substrate.

6. The radio wave reflector includes a radio wave reflective film having the reflective surface, and a movable plate supporting the radio wave reflective film on one side. The radio wave reflector according to claim 1, wherein the angle adjustment device is attached to the movable plate.

7. The radio wave reflector according to claim 2, wherein the fixing plate has an adhesive layer on the mounting surface to be attached to the object to be installed.

8. The radio wave reflector according to claim 1, wherein the radio wave reflector reflects radio waves at an angle different from the angle of incidence.

9. The radio wave reflector according to claim 8, wherein the radio wave reflection angle of the radio wave reflector is set to 1 degree or more and 20 degrees or 70 degrees or more and 89 degrees.

Images