JP2008249678A - Covering and sticking parts for radar equipment - Google Patents

Abstract

It is possible to prevent deterioration of the transmission characteristics of radar waves without deteriorating the appearance of the surface of a coated part.
A vehicular bumper is made of a resin material such as polypropylene with a metallic coating on the surface. Also, a millimeter wave radar device 12 that is mounted on a vehicle and emits millimeter waves forward of the vehicle is installed on the back side of the vehicle bumper 10 so that the millimeter waves pass through the vehicle bumper 10. . A concave / convex shape 10A is formed on the rear surface of the bumper 10 for the vehicle to form a millimeter wave path, and the concave / convex shape 10A has 1/4 of the wavelength λ of millimeter wave and n / 2 times the wavelength. A plurality of peaks having a height h within a predetermined range including the sum are formed.
[Selection] Figure 1

Description

  The present invention relates to a covering part and a sticking part of a radar device, and in particular, a covering part of a radar device provided so as to cover a radar device provided in a vehicle and a sticking part attached to the covering component. About.

  Conventionally, a millimeter wave is emitted from the back side of a covering component such as a vehicle bumper to detect a distance from a detection target. At this time, if metallic coating is applied to the bumper, there is a problem that the transmission characteristics of millimeter waves are greatly deteriorated. Further, since the millimeter wave transmission characteristic has a frequency characteristic, the millimeter wave transmission characteristic is further greatly deteriorated depending on the thickness of the bumper.

  This is because the millimeter waves reflected by the metallic coating layer surface and the bumper back surface interfere with each other and the reflection increases. Metallic paint usually contains aluminum pieces but has a large transmission loss.

Here, with respect to metallic coating, a coated part that improves the transmission characteristics of millimeter waves using indium with fine particles is known (Patent Documents 1 and 2).
Japanese Patent No. 3366299 Patent 3397075

  However, the techniques described in Patent Documents 1 and 2 have a problem in that indium with fine particles is mixed in the metallic coating and indium, which is a rare metal, is required, and thus costs are increased.

  The present invention has been made to solve the above-described problems, and provides a covering part and a sticking part of a radar device that can prevent deterioration of the transmission characteristics of radar waves with an inexpensive configuration. Objective.

  In order to achieve the above object, a covering part of a radar device according to the present invention is a covering part of a radar device that is provided so as to cover a radar device provided in a vehicle and is formed of a resin material, The sum of 1/4 of the wavelength of the radar wave and n / 2 times the wavelength of the radar wave (n = 0, 1, 2,...) An uneven shape composed of a plurality of peaks having a length within a predetermined range including the height is formed.

  The covering component of the radar device according to the present invention is provided so as to cover the radar device, and the covering component is formed of a resin material. Therefore, the radar wave from the radar device needs to pass through the covering component.

  Further, the length of the radar wave path portion from the radar device on the back surface of the covering component is set to a length within a predetermined range including the sum of 1/4 of the wavelength of the radar wave and n / 2 times the wavelength of the radar wave. Even if the radar wave is reflected from the surface of the coated part and the uneven surface, the transmission characteristics of the radar wave deteriorate due to the interference of the reflected radar wave. do not do.

  Thus, the length within a predetermined range including the sum of 1/4 of the wavelength of the radar wave and n / 2 times the wavelength of the radar wave path portion from the radar device on the back surface of the coated part is defined as the height. By forming the concavo-convex shape composed of a plurality of peaks, it is possible to prevent deterioration of the transmission characteristics of radar waves with an inexpensive configuration.

  Moreover, the uneven surface according to the present invention can be covered with a resin material having a lower dielectric constant than the material forming the uneven shape. Thereby, mud, water, and dirt can be made difficult to adhere to the uneven surface, so that it is possible to prevent the deterioration of the transmission characteristics of radar waves even when the vehicle is in use.

  Moreover, the surface of the covering component according to the present invention can be painted. Thereby, the appearance of the surface of the covering member can be improved.

  Moreover, the covering component according to the present invention can be provided on the surface of the vehicle.

  An adhesive component according to the present invention is provided so as to cover a radar device provided in a vehicle, and is attached to a path portion of a radar wave from the radar device on the back surface of a coated component formed of a resin material. A sum of 1/4 of the wavelength of the radar wave and n / 2 times the wavelength of the radar wave (n = 0, 1, 2,...) A concavo-convex shape made up of a plurality of peaks having a length within a predetermined range including the height is formed.

  The sticking component according to the present invention is provided so as to cover the radar device, and is stuck to a radar wave path portion on the back surface of the covering component formed of a resin material. Therefore, the radar wave from the radar device needs to pass through the sticking part and the covering part.

  Further, on the surface opposite to the attachment surface of the attachment component, a plurality of heights having a length within a predetermined range including the sum of 1/4 of the wavelength of the radar wave and n / 2 times the wavelength of the radar wave are provided. Convex / concave shape consisting of peaks is formed, and even if the radar wave is reflected from the surface of the coated part and the concave / convex shape of the pasted part, the transmission characteristics of the radar wave deteriorate due to interference of the reflected radar wave Does not occur.

  Thus, the length within a predetermined range including the sum of 1/4 of the wavelength of the radar wave and n / 2 times the wavelength of the radar wave path portion from the radar device on the back surface of the coated part is defined as the height. By forming the concavo-convex shape composed of a plurality of peaks, it is possible to prevent deterioration of the transmission characteristics of radar waves with an inexpensive configuration. Moreover, since it is only necessary to stick the sticking part to the existing covering part, the existing covering part can be prevented from being deteriorated in the transmission characteristics of the radar wave with an inexpensive configuration.

  As described above, according to the covering component of the radar device of the present invention, the radar wave path portion from the radar device on the back surface of the covering component includes 1/4 of the wavelength of the radar wave and n / 2 times the wavelength. By forming a concavo-convex shape consisting of a plurality of peaks having a height within a predetermined range including the sum of the above, it is possible to prevent deterioration of the transmission characteristics of radar waves with an inexpensive configuration. can get.

  Further, according to the pasting part of the present invention, the path portion of the radar wave from the radar device on the back surface of the covering part includes a predetermined value including the sum of 1/4 of the wavelength of the radar wave and n / 2 times the wavelength. By forming a concavo-convex shape consisting of a plurality of peaks with a length within the range, it is possible to prevent deterioration of the transmission characteristics of radar waves without deteriorating the appearance of the surface of the coated part, Since it is only necessary to attach the sticking part to the existing covering part, it is possible to obtain an effect that the deterioration of the transmission characteristics of the radar wave can be prevented with an inexpensive configuration with respect to the existing covering part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, a case where the present invention is applied to a vehicle bumper whose surface is metallicly coated will be described as an example.

  As shown in FIG. 1, the vehicular bumper 10 according to the first embodiment has a metallic coating surface and is made of a resin material such as polypropylene. Further, a millimeter wave radar device 12 mounted on a vehicle and emitting millimeter waves forward of the vehicle is installed on the back side of the vehicle bumper 10 so that the millimeter waves pass through the vehicle bumper 10. .

An uneven shape 10 </ b> A is formed on the rear surface of the vehicular bumper 10, which is the surface facing the millimeter wave radar device 12, as a millimeter wave path. As shown in FIGS. 2 and 3, the concavo-convex shape 10A is formed with V-shaped grooves having a predetermined depth orthogonal to each other, and the concavo-convex shape 10A has a height h ( A plurality of ridges (same as the depth of the groove) are formed. Here, assuming that the wavelength of the millimeter wave is λ, the height h of the peak is a range including (λ / 4 + (n / 2) · λ) as shown in the following equation (1).
(1/8 + n / 2) · λ ≦ h ≦ (3/8 + n / 2) · λ (1)
(N = 0, 1, 2, ...)

  In FIG. 9, when the unevenness 0.5 mm and the unevenness are compared, at 76 GHz or less, the unevenness 0.5 mm has a larger transmission amount. Here, 0.5 mm corresponds to λ / 8, which is effective when the height h of the mountain is larger than this. Therefore, the lower limit of the range of h is (1/8 + n / 2) · λ. Further, the upper limit of the range of h is (3/8 + n / 2) · λ so that the most effective (λ / 4 + (n / 2) · λ) is centered in the range of h.

  For example, the height h may be any of 0.5 mm, 0.8 mm, and 1.0 mm at a frequency of 76 GHz. The height h is preferably λ / 4 + (n / 2) · λ. Moreover, it is preferable to form a peak so that the lateral width w of the peak of the concavo-convex shape 10A is equal to the height h.

  The millimeter wave radar device 12 emits a millimeter wave to the back surface of the vehicle bumper 10, the emitted millimeter wave passes through the vehicle bumper 10 from the back surface to the front surface, and the transmitted millimeter wave detects the front of the vehicle. Reflects on the object. The reflected millimeter wave passes through the vehicle bumper 10 from the front surface to the back surface, and the transmitted millimeter wave is received by the millimeter wave radar device 12. Based on the received millimeter wave, the millimeter wave radar device 12 detects the distance to the detection target, the direction in which the detection target exists, the relative speed of the detection target, and the like.

  As shown in FIG. 5, the millimeter wave radar device 12 controls the millimeter wave to be transmitted by the transmission unit 20 that transmits the millimeter wave, the reception unit 22 that receives the millimeter wave, and the transmission unit 20. And a signal processing unit 24 that detects information about the detection target based on the millimeter wave received by the unit 22.

  The transmission unit 20 includes a D / A conversion circuit 26 that D / A converts the transmission control signal output from the signal processing unit 24, and a voltage controlled oscillator (VCO: Voltage Controlled) that outputs a transmission signal based on the transmission control signal. Osclator) 28, a directional coupler 30, a switch 32, and a transmission antenna 34 that emits millimeter waves, and a transmission signal is transmitted to the transmission antenna 34 via the directional coupler 30 and the switch 32. When supplied, a millimeter wave is emitted from the transmission antenna 34.

  The reception unit 22 includes a reception antenna 36 that receives millimeter waves, a switch 38, a mixer 36 that combines a part of the transmission signal from the directional coupler 30 and the reception signal from the reception antenna 36, and a mixer A baseband circuit 38 that samples the synthesized signal from the baseband circuit 36, and an A / D conversion circuit 40 that A / D converts the signal output from the baseband circuit 38.

  Next, the operation of the vehicle bumper 10 according to the first embodiment will be described. As shown in FIG. 6, when a millimeter wave is emitted from the millimeter wave radar device 12, a part of the emitted millimeter wave passes through the vehicle bumper 10 and is emitted outside the vehicle bumper 10. . Further, a part of the millimeter wave emitted from the millimeter wave radar device 12 is reflected by the front and back surfaces of the vehicle bumper 10 and returns to the millimeter wave radar device 12, so that transmission loss occurs.

  Here, a state in which a part of the millimeter wave emitted from the millimeter wave radar device 12 is reflected by the vehicle bumper 10 will be described in detail. First, a case where the millimeter wave path portion on the back surface of the vehicle bumper 10 is flat will be described.

Due to the millimeter wave reflected by the vehicular bumper 10, the millimeter wave transmission characteristics deteriorate. Here, the millimeter wave transmission characteristic of the vehicular bumper 10 is degraded depending on the thickness t of the vehicular bumper 10 as shown in FIG. 7A and the phase of the reflected wave a of the millimeter wave and the reflected wave. This is because the phase of b becomes the same, the reflected wave a reflected on the back surface of the bumper interferes with the reflected wave b reflected on the metallic coating layer surface, and the reflection of the millimeter wave increases. At this time, if the wavelength of the millimeter wave is λ, the thickness t is expressed by the following equation (2).
2t = n * λ (2)
However, n is a natural number.

The wavelength λ of the millimeter wave is expressed by the following equation (3) using the frequency f.
λ = c / f (3)
Here, c is the speed of light and is about 3 × 10 ⁸ m / s.

For example, if the frequency is 76 GHz, one wavelength is 4 mm. Further, when the dielectric constant of the vehicle bumper 10 and epsilon _b, wavelength lambda _b that propagates through the vehicle bumper 10 is expressed by the following equation (4).

  For example, if the relative permittivity of the vehicle bumper 10 is 2.2, one wavelength propagating in the vehicle bumper 10 is 2.7 mm.

  Therefore, unless the thickness of the vehicle bumper 10 is manufactured with an accuracy of about 1/10 or less of one wavelength propagating in the vehicle bumper 10, that is, an accuracy of 0.27 mm or less, deterioration of the millimeter wave transmission characteristic is avoided. Is difficult. However, it is impossible to maintain the current cost and reduce the thickness accuracy of the vehicle bumper 10 to 0.27 mm or less.

  Next, the case where the millimeter wave path portion on the back surface of the vehicular bumper 10 has an uneven shape 10A will be described. As shown in FIG. 7 (B), the path portion of the millimeter wave has a concavo-convex shape 10A, so that a plurality of reflected waves a and a ′ are created by a plurality of surface portions having different concavo-convex shapes 10A. As a result, even if the thickness accuracy of the bumper 10 for the vehicle deteriorates, a plurality of reflected waves a and a ′ from the surface of the concavo-convex shape 10A interfere with the reflected wave b from the metallic coating surface, and the reflection of the millimeter wave is large. Therefore, good transmission characteristics can be obtained regardless of the thickness t of the vehicle bumper 10.

  As described above, by setting the millimeter wave path portion on the back surface of the vehicle bumper 10 to the uneven shape 10A, a part of the millimeter wave emitted from the millimeter wave radar device 12 is metallic coated on the vehicle bumper 10. Since the light is reflected by the surface and a plurality of surface portions having different heights of the concavo-convex shape 10 </ b> A and returns to the millimeter wave radar device 12, the transmission property does not deteriorate due to the thickness of the vehicle bumper 10, and the light passes through the vehicle bumper 10. Then, a part of the millimeter wave reflected and returned from the detection object can be received by the millimeter wave radar device 12.

  Next, an experiment was performed using the vehicle bumper 10 according to the first embodiment under the following conditions.

  Each bumper material with an uneven shape formed by making each V-shaped groove of depth 0.5mm, 0.8mm, and 1.0mm perpendicular to the opposite surface of the bumper material (thickness 4mm) coated with metallic on one side A bumper material that was prepared and not formed with uneven shapes was prepared. Then, as shown in FIG. 8, each bumper material as a measurement object is directed to the transmission antenna side constituted by the dielectric lens antenna, and the surface on which the uneven shape is formed, and the reception antenna constituted by the dielectric lens antenna. Install so that the metallic paint surface is facing to the side.

  Then, millimeter wave transmission characteristics are measured by a vector network analyzer. In the experiment in the present embodiment, the free space method is adopted, and multiple reflections are suppressed to enable highly accurate transmission amount measurement.

  Next, experimental results will be described with reference to FIG. When the millimeter wave frequency is 76 GHz, the transmission loss is approximately 2.8 dB in the bumper material in which the uneven shape is not formed. However, in the bumper material in which the uneven shape having a depth of 0.5 mm is formed, the transmission loss is In a bumper material having a concavo-convex shape with a depth of 0.8 mm, the transmission loss is about 1.5 dB. With a bumper material having a concavo-convex shape with a depth of 1 mm, the transmission loss is It was about 1 dB. Further, the transmission loss in each bumper material changes according to the frequency of the millimeter wave.

  As can be seen from FIG. 9, when the frequency of the millimeter wave is 76 GHz, the bumper material with the uneven shape formed better transmission characteristics than the bumper material with no uneven shape.

  As described above, according to the vehicle bumper according to the first embodiment, the millimeter wave path portion from the millimeter wave radar device on the back surface of the vehicle bumper has 1/4 of the wavelength of the millimeter wave. By forming a concavo-convex shape consisting of a plurality of peaks with a length within a predetermined range including the sum of n / 2 times the wavelength, the appearance of the surface of the vehicle bumper is not deteriorated with an inexpensive configuration. In addition, it is possible to prevent degradation of millimeter wave transmission characteristics.

  In addition, since the millimeter wave transmission characteristics of the vehicle bumper are improved, the detection distance and detection range of the millimeter wave radar device can be expanded, and the distance, direction, relative speed, etc. of the detection object can be detected. Accuracy can be improved.

  In addition, even if the thickness of the vehicle bumper fluctuates due to manufacturing, the millimeter wave transmission characteristics do not deteriorate due to the thickness, and therefore, the millimeter wave transmission characteristics can be prevented from being deteriorated at low cost.

  Further, it is possible to reduce millimeter wave transmission loss without changing the metallic coating of the vehicle bumper.

  In the above embodiment, the case where the millimeter wave is emitted at right angles to the back surface of the vehicle bumper has been described as an example. However, the present invention is not limited to this, and the method for the back surface of the vehicle bumper is described. The millimeter wave may be emitted at an angle inclined from the line. For example, even when the oblique incidence angle is set to 20 degrees or 40 degrees, as is understood from the experiment result of the oblique incidence characteristics shown in FIG. 10, it is good as in the case of incidence at a right angle (when the oblique incidence angle is set to 0 degree). Transmission characteristics can be obtained.

  Moreover, although the case where the groove | channel was put in the vehicle bumper and the uneven | corrugated shape was formed was demonstrated to the example, you may form uneven | corrugated shape so that a several peak may protrude from the back surface of a vehicle bumper.

  Next, a vehicle bumper according to a second embodiment will be described. In addition, about the part of the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The second embodiment is different from the first embodiment in that the uneven surface of the vehicle bumper is coated with a resin material.

  As shown in FIG. 11, in the vehicle bumper 210 according to the second embodiment, the surface of the concavo-convex shape 210 </ b> A is coated with a low-inductivity resin material (for example, expanded polystyrene).

  In a normal car environment, mud, water, and dirt get on the back of the bumper. In this case, such a deposit is particularly likely to adhere to the uneven surface. Therefore, in this embodiment, the uneven surface is not easily soiled with Teflon (registered trademark) or expanded polystyrene, and is coated with a material having a dielectric constant lower than that of the resin material of the bumper. In this case, good millimeter wave transmission characteristics can be maintained.

  In this way, by coating the uneven surface with a low induction rate resin material that is difficult for water, mud, etc. to adhere to it, it prevents water, mud, etc. from adhering to the uneven shape, and as a result, the actual automobile Even in the use environment, good millimeter wave transmission characteristics can be maintained.

  Next, a vehicle bumper according to a third embodiment will be described. In addition, about the part of the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The third embodiment is different in that the frequency of the millimeter wave emitted from the millimeter wave radar device is changed in accordance with the direction of the concave and convex groove of the vehicle bumper.

  The method of inserting the concave and convex grooves of the vehicle bumper is one of a plurality of patterns shown in FIG. In the first pattern of the vehicle bumper, as shown in FIG. 12 (A), the concave / convex shape is formed so that the direction of the concave / convex groove is parallel to the polarization direction of the millimeter wave, In the second pattern of the vehicle bumper, as shown in FIG. 12B, the concave and convex shape is formed so that the direction of the concave and convex groove is orthogonal to the direction of the polarized wave of the millimeter wave. In the third pattern of the vehicle bumper, as shown in FIG. 12B, the direction of the concavo-convex groove is parallel to the direction of the millimeter wave polarization and the direction of the millimeter wave polarization. The concavo-convex shape is formed so as to be both the direction and the orthogonal direction.

  Next, an experiment was performed using the vehicle bumper according to the third embodiment under the following conditions. Prepare each bumper material with a concave and convex shape formed by inserting a V-shaped groove with a depth of 1.0 mm in the above three patterns on the opposite surface of the metallic bumper material (thickness 4 mm) on one side. The transmission characteristics of millimeter waves are measured by the same method as in the embodiment.

  Next, experimental results will be described with reference to FIG. Even with the same bumper material, the frequency at which the millimeter wave transmission amount is maximized differs depending on how the grooves are inserted. Therefore, the amount of millimeter wave transmission can be maximized by controlling the frequency of the millimeter wave emitted from the millimeter wave radar device by changing the groove in the concave and convex shape on the back surface of the bumper for the vehicle. it can.

  Next, a vehicle bumper according to a fourth embodiment will be described. In addition, about the part of the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The fourth embodiment is different from the first embodiment in that a concavo-convex sheet having a concavo-convex shape is adhered to the back surface of a vehicle bumper.

  As shown in FIG. 14, in the fourth embodiment, the back surface of the vehicle bumper 410 is flat, and is attached to the radar wave path portion of the millimeter wave radar device 12 on the back surface of the vehicle bumper 410. A concavo-convex sheet 414 having a concavo-convex shape 414A formed on the opposite surface is attached.

  As in the first embodiment, the concavo-convex shape 414A of the concavo-convex sheet 414 has a peak of a predetermined height h ((1/8 + n / 2) · λ ≦ h ≦ (3/8 + n / 2) · λ). A plurality of are formed.

  The concavo-convex sheet 414 is manufactured separately from the vehicle bumper 410 and is adhered to the back surface of the vehicle bumper 410 with an adhesive having a small loss.

  The rugged sheet 414 having the concavo-convex shape 414A formed on the front surface is attached to the millimeter wave path portion on the back surface of the vehicular bumper 410 according to the fourth embodiment, and is emitted from the millimeter wave radar device 12. A part of the millimeter wave is reflected by the metallic paint surface of the vehicle bumper 410 and a plurality of surface portions having different heights of the concavo-convex shape 414 </ b> A and returns to the millimeter wave radar device 12. The millimeter wave radar device 12 can receive a part of the millimeter wave that has been transmitted through the vehicle bumper 410 and reflected from the object to be detected without deterioration of the transmission characteristics.

  According to the concavo-convex sheet according to the fourth embodiment, the millimeter wave path portion from the millimeter wave radar device on the back surface of the vehicle bumper has a wavelength of 1/4 of the millimeter wave and n / 2 times the wavelength. By forming a concavo-convex shape consisting of a plurality of peaks with a length within a predetermined range including the sum of, the transmission characteristics of millimeter waves with an inexpensive configuration and without deteriorating the appearance of the surface of the vehicle bumper Can be prevented.

  In addition, because it is only necessary to attach a concave and convex sheet to the back of an existing vehicle bumper, the transmission characteristics of millimeter waves can be reduced without compromising the surface appearance of the vehicle bumper with an inexpensive configuration. Can be prevented.

  Next, a fifth embodiment will be described. In addition, about the part of the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The fifth embodiment is different in that a millimeter wave radar device is provided not on the vehicle bumper but on the back side of the headlamp cover.

  As shown in FIG. 15A, in the fifth embodiment, the millimeter wave radar device 12 is provided in the headlamp 510. As shown in FIG. 15B, a headlamp cover 510A made of a resin material is provided on the surface of the headlamp 510, and the millimeter wave radar device 12 is installed on the back side of the headlamp cover 510A. ing.

  In addition, a concavo-convex shape 510 </ b> B is formed in a portion of the rear surface of the headlamp cover 510 </ b> A serving as a millimeter wave path. In the uneven shape 510B, V-shaped grooves having a predetermined depth h are formed orthogonally as in the first embodiment.

  The millimeter wave radar device 12 emits millimeter waves to the back surface of the headlamp cover 510A, and the emitted millimeter waves pass through the headlamp cover 510A from the back surface to the front surface, and the transmitted millimeter waves are forward or side of the vehicle. The millimeter wave reflected by the detection object on the side and returned after reflection passes through the headlamp cover 510A from the front surface to the back surface, and the transmitted millimeter wave is received by the millimeter wave radar device 12. Based on the received millimeter wave, the millimeter wave radar device 12 detects the distance to the detection target, the direction in which the detection target exists, the relative speed of the detection target, and the like.

  By forming the millimeter wave path portion on the back surface of the headlamp cover 510A according to the fifth embodiment into a concavo-convex shape 510B, a part of the millimeter wave emitted from the millimeter wave radar device 12 can be obtained from the headlamp cover 510A. Since the light is reflected by the surface and a plurality of surface portions having different heights of the concavo-convex shape 510B and returns to the millimeter wave radar device 12, the transmission characteristics are not degraded by the thickness of the headlamp cover 510A, and the light passes through the headlamp cover 510A. Then, a part of the millimeter wave reflected and returned from the detection object can be received by the millimeter wave radar device 12.

  In this way, the millimeter wave path portion from the millimeter wave radar device on the back surface of the headlamp cover has a length within a predetermined range including the sum of 1/4 of the wavelength of the millimeter wave and n / 2 times the wavelength. By forming the concavo-convex shape made up of a plurality of peaks with a height, it is possible to prevent the millimeter wave transmission characteristics from deteriorating with an inexpensive configuration without deteriorating the appearance of the surface of the headlamp cover.

  In the above embodiment, the case where the uneven shape is formed on the back surface of the bumper or the headlamp cover has been described as an example, but the present invention is not limited to this, and is provided as at least a part of the surface of the vehicle body, and The present invention can be applied to other components as long as they are coated components that cover the millimeter wave radar device.

It is the schematic which shows the structure of the bumper for vehicles and the millimeter wave radar apparatus which concern on the 1st Embodiment of this invention. It is a top view which shows the uneven | corrugated shape of the vehicle bumper which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the uneven | corrugated shape of the vehicle bumper which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the uneven | corrugated shape of the vehicle bumper which concerns on the 1st Embodiment of this invention. It is the schematic which shows the structure of a millimeter wave radar apparatus. It is an image figure which shows a mode that the millimeter wave from a millimeter wave radar apparatus permeate | transmits the bumper for vehicles, and reflects with the bumper for vehicles. (A) An image diagram showing a state where a millimeter wave is reflected in a vehicular bumper having a flat back surface, and (B) a millimeter wave is reflected in the vehicular bumper according to the first embodiment of the present invention. It is an image figure which shows a mode. It is the schematic which shows the experimental apparatus for measuring the permeation | transmission characteristic of a millimeter wave. It is a graph which shows the relationship between the permeation | transmission amount of a millimeter wave, and frequency when changing the height of an uneven | corrugated shaped peak. It is a graph which shows the relationship between the transmission amount of a millimeter wave at the time of changing an oblique incident angle, and a frequency. It is the schematic which shows the structure of the bumper for vehicles and the millimeter wave radar apparatus which concern on the 2nd Embodiment of this invention. It is an image figure which shows the pattern of the direction of the groove | channel of the uneven | corrugated shape of the bumper for vehicles concerning the 3rd Embodiment of this invention, and the polarized wave of millimeter wave. It is a graph which shows the relationship between the amount of permeation | transmission of a millimeter wave, and a frequency when changing the pattern of how to form an uneven | corrugated shaped groove | channel. It is the schematic which shows the structure of the bumper for vehicles which concerns on the 4th Embodiment of this invention, an uneven | corrugated sheet | seat, and a millimeter wave radar apparatus. (A) The schematic which shows the structure of the headlamp which concerns on the 5th Embodiment of this invention, and a millimeter wave radar apparatus, (B) The schematic which shows the structure of a headlamp cover and a millimeter wave radar apparatus. .

Explanation of symbols

10, 210, 410 Bumper for vehicle 10A, 210A, 414A, 510B Uneven shape 12 Millimeter wave radar device 414 Uneven sheet 510 Head lamp 510A Head lamp cover

Claims (5)

A radar device covering component provided to cover a radar device provided in a vehicle and formed of a resin material,
The sum of 1/4 of the wavelength of the radar wave and n / 2 times the wavelength of the radar wave (n = 0, 1, 2,...) A covered part of a radar apparatus, wherein a concavo-convex shape including a plurality of peaks having a length within a predetermined range including a height is formed.   The covered part of the radar apparatus according to claim 1, wherein the surface of the uneven shape is covered with a resin material having a dielectric constant lower than that of the material forming the uneven shape.   3. The radar device covering component according to claim 1, wherein a surface of the covering component is painted.   The radar device covering component according to any one of claims 1 to 3, wherein the covering component is provided on a surface of the vehicle. An adhesive component that is provided so as to cover a radar device provided in a vehicle, and is attached to a path portion of a radar wave from the radar device on the back surface of a coating component formed of a resin material,
A length within a predetermined range including a sum of 1/4 of the wavelength of the radar wave and n / 2 times (n = 0, 1, 2,...) Of the wavelength of the radar wave on the surface opposite to the sticking surface. A sticking part having a concavo-convex shape composed of a plurality of peaks each having a height.

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