Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
  • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
  • G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/27—Adaptation for use in or on movable bodies
  • H01Q1/32—Adaptation for use in or on road or rail vehicles
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome

Definitions

• the present invention relates to an on-vehicle radar device radome provided on the front side of an on-vehicle radar device, and more particularly to an on-vehicle radar device radome having a snow melting function.
• a radome for an in-vehicle radar device provided on the front side of the in-vehicle radar device and having a snow melting function
• a millimeter wave transmission is performed on the surface of a base material installed so as to be substantially orthogonal to the millimeter wave irradiation direction of the in-vehicle radar device.
• a radome in which a heater wire is arranged so as to suppress performance deterioration is known (see Patent Documents 1 to 4).
• Patent Document 1 a heating sheet in which a heater wire is provided on a resin sheet is provided between a front transparent member and a rear transparent member, and the heater wire is repeatedly bent in a wave shape to generate a millimeter wave.
• a radome arranged in the transparent region is disclosed (see FIGS. 1 to 3 and paragraphs [0 0 4 0] to [0 0 4 1] of Patent Document 1).
• a heating sheet in which a heater wire is provided on a resin sheet is provided between a front transparent member and a rear transparent member, and the heater wire has an elliptical shape and is arranged outside the millimeter wave transmission region.
• the disclosed radome is disclosed (FIG. 9 and paragraphs [0 0 6 3] to [0 0 6 5] of Patent Document 1, and FIGS. 1 to 3 and paragraphs [0 0 4 0] to [Patent Document 2]. 0 0 4 2]).
• Patent Documents 3 and 4 a heating sheet in which a heater wire is provided on a resin sheet is provided so as to be sandwiched between a front base material and a rear base material, and the heater wire includes a plurality of straight line portions parallel to each other.
• a radome is disclosed which is arranged in the millimeter wave transmitting region in a wave shape formed by the folded portion. Further, in Patent Documents 3 and 4, when the linear part of the heater wire is made parallel to the plane of polarization of the millimeter wave, the plane of polarization makes plane contact with the straight part and the transmission of the millimeter wave is hindered and attenuated.
• the linear portion of the heater wire is arranged in a state of being inclined or orthogonal to the polarization plane of the millimeter wave to suppress the millimeter wave attenuation, and the folded portion of the heater wire is irradiated with the millimeter wave.
• the arrangement is disclosed to suppress millimeter wave attenuation.
• Patent Document 1 Japanese Patent Laid-Open No. 201 7-2 15242
• Patent Document 2 JP 201 7-2 1 5243
• Patent Document 3 Japanese Patent Laid-Open No. 201 8-66705
• Patent Document 4 JP 201 8-66706
• the millimeter wave attenuation is set by adjusting the direction of the millimeter wave polarization plane of the in-vehicle radar device and the direction of the straight line parallel to the heater wire. It needs to be suppressed.
• a radome on which a corrugated heater wire formed of a plurality of parallel straight portions and a folded portion is arranged has a directional dependence on the polarization plane of the millimeter wave of the in-vehicle radar device, although it can be applied to the on-vehicle radar device or the installation structure of the on-vehicle radar device in which the direction of the polarization plane that can suppress attenuation can be applied, In the case of the installation structure, the millimeter wave of the in-vehicle radar device is significantly attenuated, so it is difficult to apply.
• the present invention has been made in view of the above problems, and can secure necessary millimeter-wave transparency, has no direction dependence on the polarization plane of the millimeter-wave of an on-vehicle radar device, and is versatile.
• An in-vehicle laser that excels in snow melting ⁇ 2020/175111 3 boxes (: 171-1?2020/004910
• An object is to provide a radome for a duck device.
• the radome for an on-vehicle radar device of the present invention includes a heater wire wired in the surface direction of an electromagnetic wave transmitting base, and a main part of the heater wire is based on a base point located in the center of the surface of the base body. Further, it is characterized in that the wiring is provided in the millimeter wave transmitting region of the base in such a manner as to spread toward the outer periphery.
• the main part of the heater wire is wired in such a manner that it spreads toward the outer periphery in the millimeter wave transmission region of the base with reference to the base point located at the center of the surface of the base. Regardless of which direction the polarization plane is set, the surface contact of the millimeter wave polarization plane with the heater wire can be suppressed as much as possible, and the necessary millimeter wave transmission of the on-vehicle radar device can be secured.
• the polarization plane of the millimeter wave of the in-vehicle radar device can be secured. It is possible to increase versatility by eliminating the direction dependence and diversifying the installation structure of applicable in-vehicle radar devices or in-vehicle radar devices. In addition, since the flexibility of the applicable in-vehicle radar device or the installation structure of the in-vehicle radar device is increased, the degree of freedom in design and manufacturing process can be increased, and the millimeter wave polarization plane and heater wire can be increased.
• the manufacturing efficiency can be improved and the yield can be improved. Also, by arranging the main part of the heater wire so that it spreads toward the outer periphery in the millimeter wave transmission region of the base with reference to the base point located in the center of the base surface, it is possible to improve the adhesion of snow on the outer surface of the radome. It is possible to melt snow.
• the radome for an on-vehicle radar device of the present invention is characterized in that the heater wire is wired so as to have two or more folding points inside the millimeter wave transparent region.
• the heater wire inside the millimeter wave transmission region so as to have two or more folding points, the directions of the currents flowing in the heater wire before and after the folding portion are antiparallel to each other, Reverse the electromagnetic waves emitted from the heater wire ⁇ 2020/175111 4 boxes (:171? 2020 /004910
• the radome for an on-vehicle radar device of the present invention is characterized in that the directions of the currents flowing through the heater wires that are arranged adjacent to each other are antiparallel to each other. According to this, by arranging the heater wires so that the directions of the currents flowing in the adjacent heater wires are anti-parallel to each other, the electromagnetic waves radiated from the adjacent heater wires have the opposite phase, and the electromagnetic radiation from the heater wires is emitted. Can be canceled out, and more excellent millimeter wave transmission performance can be obtained. In particular, by making the directions of the currents flowing in the heater wires that are adjacent to each other anti-parallel to each other, it is possible to achieve extremely excellent millimeter wave transmission performance as a whole.
• the radome for an on-vehicle radar device of the present invention is characterized in that a surface occupation rate of the heater wire in the millimeter wave transmissive region is more than 10% and 15% or less. According to this, it is possible to more surely eliminate the directional dependence of the in-vehicle radar device on the polarization plane of the millimeter wave, and it is possible to reliably obtain the heater performance required for the radome for the in-vehicle radar device.
• the main part of the heater wire is concentrically elliptical or concentric with a predetermined interval in the radial direction with reference to a base point located in the center of the surface of the base body. It is characterized by being wired.
• the main part of the heater wire in a radial direction at a predetermined interval in a concentric oval shape or a concentric circle shape, a good balance of snow melting is achieved over the entire millimeter wave transmission region of the radome. It can be carried out.
• the entire millimeter wave transmission region can be melted in a well-balanced manner, the millimeter wave transmission performance can be stabilized in the entire millimeter wave transmission region, and excellent millimeter wave transmission performance can be obtained.
• the main part of the heater wire is radially arranged at predetermined intervals in the circumferential direction with reference to a base point located at the center of the surface of the base body. It is characterized by
• the radome for an on-vehicle radar device of the present invention is characterized in that the heater wire is provided on a front surface side of the base body, and a transparent film positioned outside the heater wire is fixed to the base body. ..
• the heater wire on the front surface side of the base body, the heat transfer efficiency to the outer surface of the radome can be improved, and the snow adhering to the outer surface of the radome can be more surely melted. Furthermore, by reliably melting snow on the outer surface of the radome, it is possible to more reliably obtain good millimeter-wave transparency with no direction dependence.
• the transparent film on the outside of the heater wire can improve the weather resistance, corrosion resistance, and scratch resistance of the heater wire and radome.
• the radome for an on-vehicle radar device of the present invention is characterized in that the heater wire is formed of a transparent material.
• the radome for an on-vehicle radar device of the present invention is characterized in that the heater wire is provided on the back side of the base body and is arranged on the rear side of the mark symbol portion.
• the radome for an on-vehicle radar device of the present invention it is possible to secure necessary millimeter-wave transparency, and there is no direction dependence on the polarization plane of the on-vehicle radar device for the millimeter wave, which is excellent in versatility. , Can perform good snow melting. ⁇ 2020/175111 6 boxes (:171? 2020/004910 Brief explanation of the drawing)
• FIG. 1 A front view of a radome for an on-vehicle radar device according to a first embodiment of the present invention.
• FIG.2 Eighteenth enlarged sectional view of Fig.1.
• FIG. 3 An enlarged cross-sectional view of Mitsumi Izumi from Fig. 1.
• FIG. 4 Enlarged view of part ⁇ in Fig. 2.
• FIG. 6 A partially enlarged view of a radome for a vehicle-mounted radar device according to a first modified example of the first embodiment, which corresponds to FIG. 5.
• FIG. 7 A partially enlarged view of a radome for an on-vehicle radar device according to a second modified example of the first embodiment, which corresponds to FIG. 4.
• FIG. 8 A partially enlarged view of a radome for a vehicle-mounted radar device according to a second modification of the first embodiment, which corresponds to FIG. 5.
• FIG. 9 A front view of a radome for an on-vehicle radar device according to a second embodiment of the present invention.
• FIG. 10 (3) is a schematic diagram of the measuring device of the experimental example which measured the relationship between the surface occupancy of the heater wire and the angle of the heater wire with respect to the plane of polarization of the millimeter wave and the millimeter wave transmittance, and () is the experimental example.
• FIG. 11 Graph of an experimental example showing the relationship between the surface occupancy of the heater wire, the angle of the heater wire with respect to the plane of polarization of the millimeter wave, and the millimeter wave transmittance.
• a radome 1 for an on-vehicle radar device includes an electromagnetic wave transmitting base 2 and a heat sink line 3 wired in the plane direction of the base 2.
• the heater wire 3 is provided on the front surface side of the substrate 2.
• the substrate 2 of the illustrated example has an elliptical shape in a front view, and the heater wire 3 is wired along the elliptical surface.
• 1 in FIG. 1 is a mark symbol portion which is a symbol portion such as a letter of a mark such as an emblem, and in the illustrated example, it is a character-like mark symbol portion 10.
• the substrate 2 is composed of a transparent front substrate 21 and a rear substrate 22, and the front substrate 21 ⁇ 2020/175111 ⁇ (: 17 2020/004910
• the rear base material 22 and the rear base material 22 are insulative and electromagnetic wave permeable.
• the electromagnetic wave It is preferable from the viewpoint of improving the transmission performance.
• the difference in the refractive index between the front base material 21 and the rear base material 2 2 should be within the range of 0 to 10%. And good.
• the refractive index n is the real part of relative permittivity £ and the part of relative permittivity imaginary part £.
• the dielectric loss tangent (lost tangent) tan 5 defined as Equation 2 from the ratio of the imaginary part and the real part at the applied frequency be less than 0.1.
• the size of the real part of the relative permittivity is preferably 3 or less.
• the front base material 21 and the rear base material 22 it is possible to use an appropriate material within the scope of the present invention, such as a synthetic resin, glass, or ceramics, but it is preferable to use an insulating material. It is recommended to use a synthetic resin.
• the transparent front base material 21 is preferably a colorless material or a colored material having a visible light transmittance of 50% or more in order to ensure good visibility.
• the material when the front base material 21 is made of an insulating transparent synthetic resin is appropriately selected as long as it is applicable, for example, acrylic resin such as polymethylmethacrylate (! ⁇ /1 1 ⁇ /1 8). ⁇ 2020/175111 8 boxes (: 171-1?2020/004910
• Resin Polycarbonate ( ⁇ ), Acrylonitrile-Butadiene Styrene Copolymer (Hachimi 3), Polyethylene terephthalate (Mitsune), Polyethylene (Mitsumi), Polypropylene (), Acrylonitrile-Styrene Copolymer (83) , Polystyrene (3), cycloolefin polymer (0 9) and the like may be used alone or in combination of two or more, and may contain an additive.
• the material when the rear base material 22 is made of an insulating synthetic resin is suitable as long as it is applicable, for example, an acrylic resin such as polymethylmethacrylate (1 ⁇ /1 1 ⁇ /1 8).
• Juki Polycarbonate ( ⁇ ), Acrylonitrile-Butadiene-Styrene Copolymer (Hachimi 3), Acrylonitrile-Styrene-Acrylate Copolymer (838), Acrylonitrile-Ethylenepropyl Rubber-Styrene Copolymer (Hachimi 3) ) Or the like can be used alone or in combination of two or more, and an additive may be contained.
• a concave portion 2 1 is provided at a position corresponding to the mark symbol portion 1 0.
• a convex portion 2 22 is formed on the surface 2 21 of the rear base material 2 2 at a position corresponding to the mark symbol portion 10, and the front base material 2 1 and the rear base material 2 2 are The concave portion 2 1 2 and the convex portion 2 2 2 formed at corresponding positions are stacked so that they fit together.
• the electromagnetic wave permeable metal layer 23 is provided on the entire surface of the rear base material 2 2 on the surface 2 2 1 of the convex portion 2 2 2 and the flat portion 2 2 3 around the convex portion 2 2 2 in close contact.
• the electromagnetic wave permeable metal layer 23 is composed of a discontinuous metal layer that is electromagnetic wave permeable and has a metallic luster, and has glitter and integral visibility, and the surface 2 2 1 of the rear base material 2 2 It is formed by electroless plating, vapor deposition, or a grasshopper.
• the electromagnetic wave transmitting metal layer 23 is a discontinuous metal layer having a glittering and integral visibility, for example, nickel or nickel alloy, chromium or chromium alloy, cobalt or cobalt alloy, tin or tin alloy, It may be composed of copper or a copper alloy, silver or a silver alloy, palladium or a palladium alloy, platinum or a platinum alloy, rhodium or a rhodium alloy, gold or a gold alloy, or the like. ⁇ 2020/175111 9 boxes (:171? 2020 /004910
• the electromagnetic wave permeable metal layer 23 is not limited to a discontinuous metal layer that is electromagnetic wave permeable and has an integrated visibility with metallic luster, and may have an appropriate electromagnetic wave transparency within the scope of the present invention. It is possible to use a metal layer, for example, a semiconductor layer such as silicon or germanium formed by vapor deposition or skutter, or a metal having a visible light reflectance of 50% or more (for example, gold, silver, copper, It is possible to form an alloy layer with a bright metal such as aluminum, platinum, palladium, iron, nickel, chromium).
• a metal layer for example, a semiconductor layer such as silicon or germanium formed by vapor deposition or skutter, or a metal having a visible light reflectance of 50% or more (for example, gold, silver, copper, It is possible to form an alloy layer with a bright metal such as aluminum, platinum, palladium, iron, nickel, chromium).
• an underlayer for forming a modified surface that facilitates the formation of the electroless plating layer is necessary. It is also possible to provide an underlying layer such as a transparent underlying layer accordingly.
• the electromagnetic wave permeable metal layer is formed on the flat surface portion 2 23 around the convex portion 2 22 of the rear substrate 22.
• the colored layer 2 4 is provided in a region corresponding to the portion 2 1 3.
• the colored layer 24 has electromagnetic wave transparency, and is formed by being fixed to the surface of the electromagnetic wave transparent metal layer 23 by printing, painting using a paint mask or the like.
• the front substrate 21 is a substrate after the electromagnetic wave permeable metal layer 23 and the colored layer 24 are formed.
• the adhesion of the front base material 2 1 can be achieved by, for example, applying an adhesive between the back surface 2 1 1 of the front base material 21 and the electromagnetic wave permeable metal layer 2 3 and the colored layer 2 4 formed on the rear base material 2 2.
• the colored layer 2 is formed on the flat surface portion 2 1 3 around the recess 2 1 2 of the back surface 2 1 1 of the front base material 2 1 by printing or painting using a paint mask. 4 is fixed and formed, and the electromagnetic wave permeable metal layer 23 formed on the rear base material 2 2 is adhered to the colored layer 24 on the front base material 21 and the concave portion 2 1 2 on the front base material 21. It is also preferable that the composition is fixed by adhesion through an adhesive layer of the agent. ⁇ 2020/175111 10 boxes (:171? 2020 /004910
• the heater wire 3 is provided on the front surface 2 1 4 side of the front base material 21 corresponding to the front surface side of the base body 2 and is wired along the front surface 2 1 4 of the front base material 21. ..
• the heater wire 3 can be a transparent conductive film such as an I-chome film, nichrome wire, iron chrome, copper, silver, carbon fiber, or other suitable conductive material that can be applied. It is formed on the surface 2 14 of the base material 2 1 4 by printing, vapor deposition, slaughter, plating, wire bonding, etc. and wired.
• the heater wire 3 is preferably formed of a transparent material such as a transparent conductive film from the viewpoint of improving the visibility of the mark symbol portion 10 etc.
• the heater wire 3 is wired such that the main part thereof spreads toward the outer periphery in the millimeter wave transmission region of the base 2 with reference to the base point ⁇ located at the center of the surface of the base 2.
• the concentric elliptical wiring is provided with a predetermined interval in the radial direction based on the base point ⁇ 3 located at the center of the surface of the base body 2. It is also preferable that the heater wire 3 is wired in a concentric pattern with a base point located at the center of the surface of the base body 2 (a predetermined distance in the radial direction from the reference point 3).
• the heater wire 3 is more preferably set so that the surface occupancy rate in the millimeter wave transmission region 8 is more than 10% and 15% or less.
• a transparent film 4 is fixedly attached to the substrate 2.
• the transparent film 4 in the illustrated example has an adhesive layer 5 formed by an adhesive on the front surface 2 1 4 of the front base material 21 and the transparent film 4 is fixed via the transparent adhesive layer 5 to form the adhesive layer 5 Is provided so that the portion where the heater wire 3 on the surface 2 14 of the front substrate 21 is not wired is filled.
• the transparent film 4 and the transparent adhesive layer 5 can be formed of an appropriate material having insulation properties and electromagnetic wave transparency.
• the material of the transparent film 4 is, for example, Polycarbonate ( ⁇ ), Polyethylene terephthalate (Ming), Polyethylene naphthalate (Min! ⁇ 1), Polyethylene (Min), Polypropylene (). ⁇ 2020/175111 1 1 ⁇ (: 171-1?2020/004910
• the material of the adhesive layer 5 can be, for example, methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, or the like.
• a connector 6 1 and a cable 6 2 in which both ends of the heater wire 3 are electrically connected and mechanically fixed are arranged. Electric power is supplied to the heater wire 3 via 6 2 and the connector 6 1, so that the heater wire 3 generates heat.
• the heater wire 3 of the first embodiment is formed so as to extend in series, and the heater wires 3, 3
• the on-vehicle radar device radome 1 is arranged in front of the on-vehicle radar device 100 and attached to the vehicle.
• the radome 1 for an on-vehicle radar device in the illustrated example is an emblem-shaped radome
• the radome for an on-vehicle radar device of the present invention can be configured by an appropriate vehicle-mounted component such as a bumper.
• the main part of the heater wire 3 is located at the base point located in the center of the surface of the base body 2 (on the basis of 3 as the outer periphery in the millimeter wave transmission region of the base body 2).
• the in-vehicle radar device 100 can eliminate the direction dependence on the plane of polarization of the millimeter wave and can be applied to the in-vehicle radar device 100 or in-vehicle radar device.
• the yield can be improved. Also, by wiring the main part of the heater wire 3 at the base point located at the center of the surface of the base body 2 (with reference to 3 and expanding in the millimeter wave transmission region of the base body 2 toward the outer circumference, the outer surface of the radome 1 is Good snow melting of the adhered snow can be performed.
• the heater wire 3 By arranging the heater wire 3 so that it has two or more turns at the inside of the millimeter wave transmission region, the directions of the currents flowing in the heater line 3 before and after the turn part are antiparallel to each other. Then, the electromagnetic wave radiated from the heater wire 3 has an opposite phase, and the electromagnetic radiation from the heater wire 3 can be canceled out, so that more excellent millimeter wave transmission performance can be obtained. In particular, by making the directions of the currents flowing in the heater wires 3 that are adjacent to each other antiparallel to each other, extremely excellent millimeter wave transmission performance can be exhibited throughout the whole.
• the Heiyuu Line 3 when installing the Heiyuu Line 3 so that the surface occupancy ratio in the millimeter wave transmission region is more than 10% and 15% or less, it should be used for the millimeter wave polarization plane of the in-vehicle radar device 100.
• the direction dependency can be more surely eliminated, and the heater performance required for the radome 1 for an on-vehicle radar device can be surely obtained.
• the heater wire 3 on the front surface side of the base body 2
• heat transfer efficiency to the outer surface of the radome 1 can be enhanced, and snow adhering to the outer surface of the radome 1 can be more surely melted.
• the transparent film 4 on the outside of the heater wire 3 can enhance the weather resistance, corrosion resistance, and scratch resistance of the heater wire 3 and the redome 1.
• the mark symbol portion 10 such as an emblem provided behind the heater wire 3 is irrespective of the width of the heater wire 3. ⁇ 2020/175111 13 ⁇ (: 171-1?2020/004910
• radome 1 for a vehicle-mounted radar device As shown in Fig. 6, concave grooves 2 15 are formed on the front surface 2 1 4 of base 2 on the surface 2 1 4 in a shape corresponding to the manner in which heater wire 3 is wired. ing. In the part corresponding to the main part of the heater wire 3,
• a concave groove 2 15 is formed in the millimeter wave transmitting region 8 of the base 2 so as to expand toward the outer periphery.
• a base point located at the center of the surface of the base 2 (a predetermined interval is set in the radial direction with reference to 3).
• Concave ellipses or concentric circles are formed as grooves (see Fig. 1).
• the entire heater wire 3 is arranged so as to be engaged with the recessed groove 2 15 to be housed, and the main part of the heater wire 3 housed in the recessed groove 2 15 is
• the wiring is arranged so that it extends toward the outer circumference in the millimeter wave transmission region of the substrate 20! with reference to the base point ⁇ 3 located at the center.
• the main part of the heat sink line 3 housed in the concave groove 2 15 of this example is a base point located at the center of the surface of the base body 20! (Concentric oval shape with a predetermined radial interval based on 3). Alternatively, they are wired concentrically.
• the transparent film 4 covers the heater wire 3 housed in the concave groove 2 15 so as to cover the front substrate 2 1
• the transparent film 4 is provided on the front surface 2 1 4 side, and is pressure-bonded to the front base material 2 1.
• the other configuration of the on-vehicle radar device radome 1 is the same as that of the on-vehicle radar device radome 1 of the first embodiment.
• the radome 1 for an on-vehicle radar device of the first modified example of the first embodiment it is possible to eliminate the step of applying the adhesive that constitutes the adhesive layer 5, and to improve the efficiency of the manufacturing process, Manufacturing cost can be reduced by not using the agent. Further, corresponding effects can be obtained from the configuration corresponding to the radome 1 for an on-vehicle radar device of the first embodiment.
• the vehicle radar device for radome 1 ⁇ as shown in FIGS. 7 and 8, the heater wire 3 n is provided on the back side of the front substrate 2 1 and Ru consists rear substrate 2 2 which substrate 2 of transparent It is also located behind the mark symbol part 10.
• the heater wire 3 n is provided on the rear surface 2 2 4 n side of the rear base material 22 corresponding to the rear surface side of the base body 2 and is wired along the rear surface 2 2 4 n of the rear base material 2 2.
• the heater wire 3 n can be a suitable conductive wire such as a transparent conductive film such as an I-chome film, nichrome wire, iron chrome wire, carbon fiber, etc. 2 is formed on the back surface 2 2 4 n by printing or the like and wired.
• the main line of the heating line 3 n is laid out in such a manner that the main part thereof spreads toward the outer circumference in the millimeter wave transmission region of the base 2 with reference to the base point located at the center of the surface of the base 2. Therefore, in this example, the heater wire 3 n is a base point located at the center of the surface of the base 2 (concentric oval or concentric circles are arranged at predetermined intervals in the radial direction with reference to 3 (see FIG. 1).
• a back material 7 n is arranged at a position on the rear side of the heater wire 3 n, and is fixedly provided to the base body 2.
• the back material 7 n is insulative and electromagnetic wave permeable, and is formed in the same shape as the rear base material 22.
• the backing material 7 n if the front base material 21 and the rear base material 22 are matched with each other in the refractive index defined based on the complex dielectric constant, or if the refractive indexes are substantially the same or close to each other, It is preferable from the viewpoint of improving the electromagnetic wave transmission performance, and for example, it is preferable that the rear substrate 22 is made of the same material.
• the adhesive layer 5 is provided so that the portion of the back surface 2 2 4 n of the rear base material 22 2 where the heater wire 3 n is not filled is filled with the adhesive layer 5 and is bonded by an adhesive.
• the backing material 7 n and the rear substrate 22 are adhered by the layer 5 n.
• the adhesive layer 5 n can be made of an appropriate material that is insulative and has electromagnetic wave transparency, and is preferably made of the same material as the adhesive layer 5 of the first embodiment, for example.
• the heating line 3 n can be formed on the surface 71 n of the backing material 7 n by printing or the like and can be wired.
• the heater wire 3 n 2020/175111 15 ⁇ (: 171-1?2020/004910
• the other configurations of the on-vehicle radar device radome 1 n are the same as the on-vehicle radar device radome 1 of the first embodiment.
• An in-vehicle radar device for radome 1 n of the second modification of the first embodiment regardless of the line width and transparency of the heater wire 3, from outside against the mark symbol unit 1 0 and around emblem such as The visibility can be prevented from being hindered by the heater wire 3 n, and good visibility from the outside with respect to the mark symbol portion 10 such as an emblem and its surroundings can be secured.
• corresponding effects can be obtained from the configuration corresponding to the radome 1 for an on-vehicle radar device of the first embodiment.
• Automotive radar system for radome 3 of the second embodiment as shown in FIG. 9, the main portion of the heater line 3 3, millimeter wave substrate 2 with respect to the base point (3 located at the surface center of the substrate 2 Transmission area
• the wiring is such that it extends toward the outer circumference, and is arranged in a radial pattern with a predetermined interval in the circumferential direction with reference to a base point ⁇ 3 located at the center of the surface of the substrate 2.
• Heater wire 3 3 Is a shape in which a plurality of substantially fan-shaped elements are arranged in the circumferential direction with respect to the base point (3.
• the heater wire 33 is arranged so that it has two or more folding points inside the millimeter wave transmission region 8.
• the heater wires 3 3 are wired so that the directions of the currents flowing in the heater wires 3 3 that are wired next to each other are anti-parallel to each other. It is more preferable to set the surface occupancy rate in the above-mentioned manner to be more than 10% and not more than 15%.
• the other configurations are the same as those of the vehicle-mounted radar device redom 1 of the first embodiment.
• Figure 10 (3) schematically shows the millimeter wave transmitter 8 3, receiver 8 4 and evaluation device 8 5 in this system.
• the electromagnetic waves transmitted are 7 6.
• Fig. 10 Is the direction of millimeter wave propagation. Here This corresponds to exactly 5 times the half wavelength of the synthetic resin plate 8 1 at 7 6.5 ⁇ 1 to 12.
• ⁇ Is the millimeter wave transmission region, is the plane of polarization of the millimeter wave (polarization direction), and ⁇ is the angle formed by the plane of polarization of the millimeter wave and the linear heater line 82.
• the heater resin 8 2 in the millimeter wave transmission region ⁇ has a surface occupancy of 5%, 10%, 15%, 20%, 25% for each of the synthetic resin plates 81.
• the millimeter wave transmittance was measured by irradiating the millimeter wave from the side of the evening line 82 and changing the angle ⁇ of the heating line 82 with respect to the plane of polarization of the millimeter wave by 15 degrees.
• the heater wire 82 is not energized during each measurement. This measurement result is shown in Fig. 11.
• a synthetic resin plate corresponding to the base of a radome for an on-vehicle radar device.
• the permissible value of transmission attenuation can be satisfied regardless of the angle of the heater wire 81 with respect to the polarization plane of the millimeter wave. That is, when the surface occupancy of the heater wire 82 is set to 15% or less, the direction dependency of the angle ⁇ with respect to the millimeter wave transmittance is eliminated or significantly suppressed. From the viewpoint of achieving both heater performance and transmission performance of the radome for vehicle-mounted radar equipment, it is desirable that the surface occupancy of the heater wire 8 2 in the millimeter wave transmission region 8′ is more than 10% and 15% or less. ..
• the invention disclosed in the present specification is specified by changing each partial content thereof to other content disclosed in the specification, within an applicable range, in addition to the respective inventions and embodiments listed as the invention. , Or the contents identified by adding other contents of the present disclosure to these contents, or the partial contents thereof are deleted by the extent that a partial effect can be obtained, and the contents are identified as a superordinate concept. Including things.
• the invention disclosed in the present specification includes the following modifications and added contents.
• the main part of the heater wire is wired in such a manner that it extends toward the outer periphery in the millimeter wave transmission region of the base with reference to the base point located in the center of the surface of the base.
• the main parts of the heating lines 3 and 3 n of the first embodiment are wired in a concentric oval shape or a concentric circle shape with a predetermined interval in the radial direction based on the base point (3).
• configuration are also encompassed other configurations main parts of the heater clear distinction 3 3 of the second embodiment are wired radially at predetermined intervals in the circumferential direction with respect to the origin 0.
• the present invention can be used for a radome for an on-vehicle radar device.
• Millimeter wave transmission region Millimeter wave polarization plane (polarization direction), Angle formed by millimeter wave polarization plane and linear heater line

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Computer Networks & Wireless Communication (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Details Of Aerials (AREA)
• Radar Systems Or Details Thereof (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=72239444

Family Applications (1)

Country Status (2)

Families Citing this family (6)

Citations (7)

Family Cites Families (2)

• 2019
  • 2019-02-28 JP JP2019036140A patent/JP7313106B2/ja active Active
• 2020
  • 2020-02-07 WO PCT/JP2020/004910 patent/WO2020175111A1/ja active Application Filing

Patent Citations (7)

Also Published As

Similar Documents

Legal Events