Radio wave absorbing shield

Abstract

To prevent cracks and falling off due to vibrations when a vehicle is running.SOLUTION: A radio wave absorption shield 1 fixed to a vehicle 2 includes a radio wave absorption member 3 including magnetic powder 5 that absorbs radio waves, and a fixed member 4 fixed to the vehicle 2 and housing the radio wave absorption member 3. The fixed member 4 includes a fixed portion 41 fixed to the vehicle 2, and a housing portion 42 that houses the radio wave absorption member 3. The fixed member 4 includes a housing space 44 that houses the radio wave absorption member 3, and an insertion / extraction port 45 through which the radio wave absorption member 3 can be inserted into and removed from the housing space 44, and a lock portion 46 that prevents the radio wave absorption member 3 housed in the housing space 44 from being removed from the insertion / extraction port 45.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a radio wave absorption shield fixed to a vehicle.

Background Art

[0002] In a vehicle equipped with a radar used for side collision prevention or the like, in order to improve the recognition accuracy of the radar, a radio wave absorption shield is mounted to enhance the directivity of the radar and remove or reduce unnecessary radio wave components. Patent Document 1 describes a radio wave absorber in which the content ratios of magnetic powder and carbon components are optimized in order to enhance the directivity of the radar and remove or reduce unnecessary radio wave components.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The radio wave absorption shield removes or reduces unnecessary radio waves by being fixed to the vehicle. However, since the radio wave absorption shield contains a large amount of inorganic substances such as magnetic powder, it tends to be brittle. Therefore, when the radio wave absorption shield is fixed to the vehicle body, cracks may occur due to vibrations during vehicle travel and it may fall off.

[0005] Therefore, an object of the present invention is to provide a radio wave absorption shield that can suppress cracks and detachment due to vibrations during vehicle travel.

Means for Solving the Problems

[0006] The radio wave absorption shield of the present invention is as follows.

[0007] [1] A radio wave absorbing shield that is fixed to a vehicle, comprising: a radio wave absorbing member containing magnetic powder that absorbs radio waves; and a fixing member that is fixed to the vehicle and houses the radio wave absorbing member.

[0008] This radio wave absorbing shield contains magnetic powder that absorbs radio waves in its radio wave absorbing component. Therefore, it can absorb radio waves, but the radio wave absorbing component is brittle and prone to cracking and detachment. However, the stress generated in the radio wave absorbing shield due to vibrations during vehicle operation is concentrated in the fixed portion that is attached to the vehicle, and the radio wave absorbing component, which is separate from the fixed component and housed within it, does not experience significant stress. Therefore, cracking and detachment due to vibrations during vehicle operation can be suppressed.

[0009] [2] The aforementioned fixing member is a radio wave absorbing shield according to [1], which does not contain magnetic powder.

[0010] In this radio wave absorbing shield, the fixing members do not contain magnetic powder, thus suppressing the brittleness of the fixing members. As a result, even if stress generated by vibrations during vehicle operation concentrates on the fixing members, cracks and detachment of the fixing members can be suppressed. Moreover, compared to cases where magnetic powder is included in the fixing members, the amount of magnetic powder used can be reduced, thus reducing costs and weight.

[0011] [3] The radio wave absorbing shield according to [1] or [2], wherein the fixing member detachably houses the radio wave absorbing member.

[0012] In this radio wave absorbing shield, the fixing member detachably houses the radio wave absorbing member. Therefore, if the radio wave absorbing member cracks or falls off, only the radio wave absorbing member can be replaced. Conversely, if the fixing member cracks or falls off, only the fixing member can be replaced. This reduces the material costs associated with replacement.

[0013] [4] The radio wave absorbing shield according to [3], wherein the fixing member comprises a housing space for housing the radio wave absorbing member, an insertion / removal opening for inserting and removing the radio wave absorbing member from the housing space, and a locking portion for preventing the radio wave absorbing member housed in the housing space from being removed from the insertion / removal opening.

[0014] In this radio wave absorbing shield, the fixing member has a housing space, an insertion / removal opening, and a locking part, so that the radio wave absorbing member can be inserted into and removed from the housing space, and the radio wave absorbing member housed in the housing space can be prevented from falling out of the housing space.

[0015] [5] The radio wave absorbing shield according to any one of [1] to [4], wherein the fixing member has a first window that exposes a part of the radio wave absorbing member.

[0016] In this radio wave absorbing shield, the fixed member has a first window that exposes a part of the radio wave absorbing member, so that radio waves can be properly absorbed from the first window.

[0017] [6] The radio wave absorbing shield according to [5], wherein the fixing member has a second window located on the opposite side of the first window from the radio wave absorbing member and exposing a part of the radio wave absorbing member.

[0018] This radio wave absorbing shield has a second window located on the opposite side of the first window from the radio wave absorbing member, exposing a portion of the radio wave absorbing member. Therefore, even if the fixing member is made of a metal that reflects radio waves, for example, it can properly absorb radio waves without reflecting them from the first window. [Effects of the Invention]

[0019] According to the present invention, it is possible to suppress cracks and detachment caused by vibrations during vehicle operation. [Brief explanation of the drawing]

[0020] [Figure 1]It is a front view showing the radio wave absorption shield according to the embodiment. [Figure 2] It is a cross-sectional view taken along the line II-II shown in FIG. 1. [Figure 3] It is a schematic diagram enlarging a part of the radio wave absorption member. [Figure 4] It is a cross-sectional view showing the fixing member. [Figure 5] It is a front view showing a state where the radio wave absorption member is attached to and detached from the fixing member. [Figure 6] It is a cross-sectional view showing the radio wave absorption shield of the modification. [Figure 7] It is a cross-sectional view showing the radio wave absorption shield of the modification.

Mode for Carrying Out the Invention

[0021] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals, and redundant descriptions are omitted.

[0022] FIG. 1 is a front view showing the radio wave absorption shield according to the embodiment. FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. 1. As shown in FIGS. 1 and 2, the radio wave absorption shield 1 according to the present embodiment is attached to the vehicle 2. Then, the radio wave absorption shield 1 absorbs the received radio waves in order to enhance the directivity of a radar (not shown) mounted on the vehicle 2 and remove or reduce unnecessary radio wave components. The radio wave absorption shield 1 includes a radio wave absorption member 3 and a fixing member 4. The radio wave absorption member 3 and the fixing member 4 are configured of separate members (separate bodies) separable from each other.

[0023] Figure 3 is a schematic diagram showing an enlarged portion of the radio wave absorbing member. As shown in Figures 1 to 3, the radio wave absorbing member 3 is a member that absorbs radio waves. The radio wave absorbing member 3 includes magnetic powder 5 and a binder 6. In other words, the radio wave absorbing member 3 has a structure in which the magnetic powder 5 is filled into the binder 6. The magnetic powder 5 is an inorganic radio wave absorbing material. The material of the magnetic powder 5 is not particularly limited, but for example, it can be an inorganic magnetic material such as ferrite. For this reason, the radio wave absorbing member 3 has the function of absorbing radio waves, but on the other hand, it is brittle and prone to cracking and detachment. The binder 6 is not particularly limited, but for example, it can be a resin, a carbon component, etc. The binder 6 may be composed of one type of material or may be composed of multiple materials.

[0024] Figure 4 is a cross-sectional view showing the fixing member. As shown in Figures 1, 2, and 4, the fixing member 4 is fixed to the vehicle 2 and houses the radio wave absorbing member 3. In other words, in the radio wave absorbing shield 1, the fixing member 4 is fixed to the vehicle 2, but the radio wave absorbing member 3 is not fixed to the vehicle 2. When the fixing member 4 is fixed to the vehicle 2, the stress generated in the radio wave absorbing shield 1 due to vibrations during vehicle operation is concentrated in the fixing member 4 that fixes the radio wave absorbing shield 1 to the vehicle 2. For this reason, it is preferable that the fixing member 4 is made of a material that can withstand vibrations during vehicle operation. In other words, it is preferable that the fixing member 4 is made of a material that is less likely to crack or fall off even due to vibrations during vehicle operation. If the fixing member 4 contains a large amount of inorganic material such as magnetic powder 5, the fixing member 4 becomes brittle and more prone to cracking and falling off. For this reason, in order to make it less likely for the fixing member 4 to crack or fall off due to vibrations during vehicle operation, it is preferable that the fixing member 4 does not contain magnetic powder. As the material of the fixing member 4, for example, it can be a resin such as polypropylene (PP) or a metal such as iron.

[0025] The fixing member 4 has a fixing portion 41 that is fixed to the vehicle 2 and a housing portion 42 that houses the radio wave absorbing member 3. The fixing portion 41 and the housing portion 42 only need to be functionally separated, and do not need to be clearly separated.

[0026] The method of fixing the fixing part 41 to the vehicle 2 is not particularly limited and can be, for example, bolting or welding. The drawing shows, as an example, a case in which the fixing part 41 is bolted to the vehicle 2. When the fixing part 41 is bolted to the vehicle 2, the fixing part 41 has, for example, bolt holes 43 into which bolts 7 for fixing the fixing part 41 to the vehicle 2 are inserted.

[0027] The housing section 42 detachably houses the radio wave absorbing member 3. Figure 5 is a front view showing the state in which the radio wave absorbing member is attached to and detached from the fixing member. As shown in Figures 1, 2, 4, and 5, the housing section 42 has a housing space 44, an insertion / removal opening 45, a locking part 46, a first window 47, and a second window 48.

[0028] The housing space 44 is a space for housing the radio wave absorbing member 3. The housing space 44 is formed to be substantially identical in shape to the outer shape of the radio wave absorbing member 3, for example.

[0029] The insertion / removal opening 45 is an opening that allows the radio wave absorbing member 3 to be inserted into and removed from the housing space 44. The insertion / removal opening 45 communicates with the housing space 44, exposing the housing space 44 to the outside of the radio wave absorbing shield 1. The shape of the opening of the insertion / removal opening 45 is formed to be substantially the same as the outer shape of the radio wave absorbing member 3 in a direction perpendicular to the insertion / removal direction D of the radio wave absorbing member 3 into the housing space 44.

[0030] The locking portion 46 prevents the radio wave absorbing member 3 housed in the housing space 44 from being removed from the insertion / removal opening 45. The state in which the locking portion 46 prevents the radio wave absorbing member 3 housed in the housing space 44 from being removed from the insertion / removal opening 45 is called the locked state. The locking portion 46 is formed, for example, in the shape of a claw that locks the radio wave absorbing member 3 housed in the housing space 44 from the insertion / removal opening 45 side. By deforming or moving the locking portion 46, the radio wave absorbing member 3 can be inserted into the housing space 44 from the insertion / removal opening 45, and the locked state can be released to remove the radio wave absorbing member 3 housed in the housing space 44 from the insertion / removal opening 45. For example, if the locking portion 46 is formed in the claw shape described above, the radio wave absorbing member 3 can be inserted into the housing space 44 from the insertion / removal opening 45 by strongly pushing the radio wave absorbing member 3 from the insertion / removal opening 45 towards the housing space 44 and pushing the locking portion 46 down towards the housing space 44. On the other hand, by firmly pushing the radio wave absorbing member 3 housed in the housing space 44 toward the insertion / removal opening 45 and pushing down the locking part 46 toward the insertion / removal opening 45, the locked state can be released and the radio wave absorbing member 3 housed in the housing space 44 can be removed from the insertion / removal opening 45.

[0031] The first window 47 is an opening that exposes a portion of the radio wave absorbing member 3. In other words, the first window 47 is an opening that exposes the housing space 44 and the radio wave absorbing member 3 housed in the housing space 44 to the outside of the radio wave absorbing shield 1, while preventing the insertion and removal of the radio wave absorbing member 3 from the housing space 44.

[0032] The second window 48 is located on the opposite side of the first window 47 from the radio wave absorbing member 3. In other words, the first window 47 and the second window 48 are located on the front and back sides of the housing space 44 and the radio wave absorbing member 3 housed in the housing space 44. The second window 48, like the first window 47, is an opening that exposes a portion of the radio wave absorbing member 3 housed in the housing space 44. In other words, the second window 48 is an opening that exposes the housing space 44 and the radio wave absorbing member 3 housed in the housing space 44 to the outside of the radio wave absorbing shield 1, while preventing the insertion and removal of the radio wave absorbing member 3 from the housing space 44.

[0033] As described above, in the radio wave absorbing shield 1 according to this embodiment, the radio wave absorbing member 3 includes magnetic powder 5 that absorbs radio waves. Therefore, the radio wave absorbing member 3 can absorb radio waves, but the radio wave absorbing member 3 is brittle and prone to cracking and falling off. However, the stress generated in the radio wave absorbing shield 1 due to vibrations during vehicle operation is concentrated in the fixing member 4 which is fixed to the vehicle 2, and no large stress is generated in the radio wave absorbing member 3, which is housed in the fixing member 4 and is separate from the fixing member 4. Therefore, it is possible to suppress cracking and falling off due to vibrations during vehicle operation.

[0034] Furthermore, in this radio wave absorbing shield 1, since the fixing member 4 does not contain magnetic powder, it is possible to suppress the brittleness of the fixing member 4. As a result, even if stress generated by vibrations during vehicle operation concentrates on the fixing member 4, it is possible to suppress cracks and detachment of the fixing member 4. Moreover, since the amount of magnetic powder used can be reduced compared to cases where the fixing member 4 contains magnetic powder, it is possible to reduce costs and weight.

[0035] Furthermore, in this radio wave absorbing shield 1, the fixing member 4 detachably houses the radio wave absorbing member 3. Therefore, if the radio wave absorbing member 3 cracks or falls off, only the radio wave absorbing member 3 can be replaced. Conversely, if the fixing member 4 cracks or falls off, only the fixing member 4 can be replaced. This reduces the material costs associated with replacement.

[0036] Furthermore, in this radio wave absorbing shield 1, the fixing member 4 has a housing space 44, an insertion / removal opening 45, and a locking part 46, so that the radio wave absorbing member 3 can be inserted into and removed from the housing space 44, and the radio wave absorbing member 3 housed in the housing space 44 can be prevented from falling out of the housing space 44.

[0037] Furthermore, since the radio wave absorbing shield 1 has a first window 47 through which the fixing member 4 exposes a part of the radio wave absorbing member 3, radio waves can be properly absorbed from the first window 47.

[0038] Furthermore, since this radio wave absorbing shield 1 has a second window 48 located on the opposite side of the first window 47 to the radio wave absorbing member 3, exposing a part of the radio wave absorbing member 3, even if, for example, the fixing member 4 is made of a metal that reflects radio waves, it can properly absorb radio waves without reflecting them from the first window 47.

[0039] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and may be modified or applied to other things without changing the gist of each claim.

[0040] For example, although the above embodiment was described as having a first window and a second window, it may also be the case that the second window is not provided, or that neither the first nor the second window is provided. Figure 6 is a cross-sectional view showing a modified radio wave absorbing shield. In the radio wave absorbing shield 1A shown in Figure 6, the housing portion 42A of the fixing member 4A has a housing space 44, an insertion / removal opening 45, a locking portion 46, and a first window 47. In other words, the housing portion 42A of the radio wave absorbing shield 1A does not have the second window 48 of the above embodiment.

[0041] Furthermore, although the above embodiment described the fixing member as detachably housing the radio wave absorbing member, the fixing member may also detachably housing the radio wave absorbing member. Figure 7 is a cross-sectional view showing a modified radio wave absorbing shield. In the radio wave absorbing shield 1B shown in Figure 7, the housing portion 42B of the fixing member 4B has a housing space 44, a first window 47, and a second window 48. In other words, the housing portion 42B of the radio wave absorbing shield 1B does not have the insertion / removal opening 45 and locking portion 46 of the above embodiment. In the radio wave absorbing shield 1B, for example, an opening corresponding to the insertion / removal opening can be formed in the housing space 44, and after housing the radio wave absorbing member 3 in the housing space 44, the opening corresponding to the insertion / removal opening can be sealed so that the fixing member 41B detachably houses the radio wave absorbing member 3. [Explanation of Symbols]

[0042] 1...Radio wave absorbing shield, 1A...Radio wave absorbing shield, 1B...Radio wave absorbing shield, 2...Vehicle, 3...Radio wave absorbing material, 4...Fixing material, 4A...Fixing material, 4B...Fixing material, 5...Magnetic powder, 6...Binder, 7...Bolt, 41...Fixing part, 42...Housing part, 42A...Housing part, 42B...Housing part, 43...Bolt hole, 44...Housing space, 45...Insertion / removal opening, 46...Locking part, 47...First window, 48...Second window.

Claims

1. A radio wave absorbing shield fixed to a vehicle, A radio wave absorbing member containing magnetic powder that absorbs radio waves, The vehicle comprises a fixing member that is fixed to the vehicle and houses the radio wave absorbing member, The aforementioned fixing member does not contain magnetic powder. Radio wave absorbing shield.

2. A radio wave absorbing shield fixed to a vehicle, A radio wave absorbing member containing magnetic powder that absorbs radio waves, The vehicle comprises a fixing member that is fixed to the vehicle and houses the radio wave absorbing member, The fixing member detachably houses the radio wave absorbing member. Radio wave absorbing shield.

3. The aforementioned fixing member is A housing space for housing the aforementioned radio wave absorbing member, The aforementioned housing space has an insertion / removal opening from which the radio wave absorbing member can be inserted and removed, The device includes a locking mechanism that prevents the radio wave absorbing member housed in the aforementioned housing space from being removed from the insertion / removal opening. The radio wave absorbing shield according to claim 2.

4. A radio wave absorbing shield fixed to a vehicle, A radio wave absorbing member containing magnetic powder that absorbs radio waves, The vehicle comprises a fixing member that is fixed to the vehicle and houses the radio wave absorbing member, The fixing member has a first window that exposes a part of the radio wave absorbing member. Radio wave absorbing shield.

5. The fixing member has a second window located on the opposite side of the first window from the radio wave absorbing member, which exposes a part of the radio wave absorbing member. The radio wave absorbing shield according to claim 4.

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