Snow-melting radome and its manufacturing method

Abstract

To prevent disconnection of a heater wire, and improve durability against repeated use.SOLUTION: There is provided a snow melting radome 1 in which an electromagnetic transmitting base 2 is constituted by stacking and arranging a first resin base material 3 and a second resin base material 4, a heater wire 5 wired in a surface direction of the base 2 is embedded between the first resin base material 3 and the second resin base material 4, one connection part 51 of the heater wire 5 and one wire harness connection terminal 71 are conductively connected to each other, the other connection part 52 of the heater wire 5 and the other wire harness connection terminal 72 are conductively connected to each other, a first redundant wiring part 53 is locally provided in a part of the heater wire 5 on a side closer to the side of the electromagnetic transmitting region R than the one connection part 51, and a second redundant wiring part 54 is locally provided in a part of the heater wire 5 on a side closer to the side of the electromagnetic transmitting region R than the other connection part 52.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a snow-melting radome, such as a radome for an on-vehicle radar device, having a snow-melting function, and a method for manufacturing the same. [Background technology]

[0002] A conventional radome for an automotive radar device having a snow-melting function is disclosed in Patent Document 1. In the radome of Patent Document 1, a heater wire is embedded between a first resin substrate and a second resin substrate, the heater wire being routed along a groove. A first metal plate and a second metal plate are embedded between the first resin substrate and the second resin substrate in an area other than the electromagnetic wave transmitting area so as to be isolated from each other. One end of the heater wire and one wire harness connection terminal are placed and fixed on the mounting surface of the first metal plate, and the other end of the heater wire and another wire harness connection terminal are placed and fixed on the mounting surface of the second metal plate. The first metal plate and the second metal plate prevent the resin substrate from being melted by heat generated when the end of the heater wire routed in the resin substrate is electrically connected to the wire harness connection terminal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7158818 Summary of the Invention [Problem to be solved by the invention]

[0004] In the radome of Patent Document 1, the portion of the heater wire closer to the electromagnetic wave transmitting region than one end of the heater wire and the portion closer to the electromagnetic wave transmitting region than the other end of the heater wire are each wired in a straight line. In this configuration, the heater wire repeatedly expands when heat is generated and contracts when heat generation stops, causing repeated tensile stresses to be applied to the straight line portions, making the straight line portions more susceptible to breakage. Therefore, there is a demand for a radome that can prevent breakage of the heater wire and improve the durability of the heater wire against repeated use.

[0005] The present invention has been proposed in view of the above problems, and aims to provide a snow-melting radome and a method for manufacturing the same that can prevent breakage of the heater wire and improve the durability of the heater wire against repeated use. [Means for solving the problem]

[0006] The snow-melting radome of the present invention is made by laminating a first resin base material and a second resin base material to form an electromagnetic wave-transmitting radome. Radome The substrate is configured, Radome a heater wire wired in a surface direction of the base is buried between the first resin base material and the second resin base material, one connection portion of the heater wire is electrically connected to one wire harness connection terminal, the other connection portion of the heater wire is electrically connected to another wire harness connection terminal, and a first redundant wiring portion is locally provided in a portion of the heater wire closer to an electromagnetic wave transmitting region than the one connection portion of the heater wire, the first redundant wiring portion is fixed to the first resin base material and the second resin base material; A second redundant wiring portion is locally provided in a portion of the heater wire closer to the electromagnetic wave transmission region than the other connection portion of the heater wire. the second redundant wiring portion is fixed to the first resin base material and the second resin base material; It is characterized by the fact that According to this, the first redundant wiring section, which is locally provided closer to the electromagnetic wave transmitting region than one connection section of the heater wire, can disperse and reduce thermal stress repeatedly applied to the heater wire portion near one connection section, and the second redundant wiring section, which is locally provided closer to the electromagnetic wave transmitting region than the other connection section of the heater wire, can disperse and reduce thermal stress repeatedly applied to the heater wire portion near the other connection section, thereby preventing breakage of the heater wire and improving durability of the heater wire against repeated use.

[0007] The snow melting radome of the present invention is Radome a first metal material and a second metal material are embedded between the first resin base material and the second resin base material in an area other than the electromagnetic wave transmitting area of ​​the base so as to be isolated from each other; one connection portion of the heater wire and one wire harness connection terminal are placed on a mounting surface of the first metal material so as to be fixed to the first metal material, thereby electrically connecting the one connection portion of the heater wire and the one wire harness connection terminal; and the other connection portion of the heater wire and another wire harness connection terminal are placed on a mounting surface of the second metal material so as to be fixed to the second metal material, thereby electrically connecting the other connection portion of the heater wire and the other wire harness connection terminal. According to this, by providing the first metal material and the second metal material, it is possible to prevent the heat generated when electrically connecting the connection portion of the heater wire wired in the resin base material to the wire harness connection terminal from melting and damaging the resin base material.

[0008] The snow melting radome of the present invention is characterized in that the first redundant wiring portion is formed in a serpentine shape, and the second redundant wiring portion is also formed in a serpentine shape. This allows the redundant length of the meandering path to more reliably distribute and reduce the thermal stress repeatedly applied to the heater wire, and more reliably reduce the effects of expansion and contraction due to thermal stress on the heater wire. Also, the meandering path allows the length of the redundant path to be extended while ensuring the required wire width of the heater wire 5 required for snow melting.

[0009] The snow melting radome of the present invention is characterized in that the meandering of each of the first redundant wiring section and the second redundant wiring section is repeated once or more and the fluctuation range of the meandering is five times or more the heater wire width. This can further improve the dispersibility of thermal stress.

[0010] The snow melting radome of the present invention is the heater wire Tip side Part a first end redundant wiring portion connected to the one connecting portion; Separate from the first redundant wiring section the other connection portion of the heater wire. the heater wire Tip side Part a second tip redundant wiring portion connected to the other connection portion; Separate from the second redundant wiring section It is characterized by being provided locally. This allows the first tip redundant wiring portion to distribute and reduce the thermal stress repeatedly applied to the heater wire portion near one of the connection portions, and the second tip redundant wiring portion to distribute and reduce the thermal stress repeatedly applied to the heater wire portion near the other connection portion, thereby more reliably preventing breakage of the heater wire and further improving the durability of the heater wire against repeated use.

[0011] The snow melting radome of the present invention is characterized in that the first tip redundant wiring portion is formed in a serpentine shape, and the second tip redundant wiring portion is also formed in a serpentine shape. This allows the redundant length of the meandering path of the first and second tip redundant wiring sections to more reliably distribute and reduce the thermal stress repeatedly applied to the heater wire, and more reliably reduce the effects of expansion and contraction due to thermal stress on the heater wire. In addition, the meandering path allows the length of the redundant path to be extended while ensuring the required wire width for melting snow on the heater wire 5.

[0012] The method for manufacturing a snow melting radome of the present invention includes a first step of fitting and arranging a first metal material and a second metal material in a first recess and a second recess formed so as to be isolated from each other on one surface of an electromagnetic wave permeable first resin base material, respectively; a second step of wiring a heater wire in a predetermined pattern on one surface of the first resin base material, placing one connection part of the heater wire on an exposed mounting surface of the first metal material and locally forming a first redundant wiring part in a part of the heater wire closer to the electromagnetic wave permeable region than the one connection part of the heater wire, and placing the other connection part of the heater wire on an exposed mounting surface of the second metal material and locally forming a second redundant wiring part in a part of the heater wire closer to the electromagnetic wave permeable region than the other connection part of the heater wire; a third step of placing one wire harness connection terminal on the mounting surface where the second metal material is exposed, and fixing one connection portion of the heater wire and the one wire harness connection terminal to the first metal material, thereby electrically connecting the one connection portion of the heater wire and the one wire harness connection terminal, and placing another wire harness connection terminal on the mounting surface where the second metal material is exposed, and fixing the other connection portion of the heater wire and the other wire harness connection terminal to the second metal material, thereby electrically connecting the other connection portion of the heater wire and the other wire harness connection terminal; and a third step of forming an electromagnetic wave permeable second resin base material by injection molding on the mounting surface of the first metal material and the mounting surface of the second metal material, and fixing the second resin base material to the first resin base material. The radome base is constructed by At the same time, the heater wire, the first metal material, the first wire harness connection terminal, the second metal material, and the other wire harness connection terminal are embedded between the first resin base material and the second resin base material. the first redundant wiring portion is fixed to the first resin base material and the second resin base material, and the second redundant wiring portion is fixed to the first resin base material and the second resin base material. The method is characterized by comprising a fourth step. According to this, the first redundant wiring section, which is locally provided closer to the electromagnetic wave transmitting region than one connection section of the heater wire, can disperse and reduce thermal stress repeatedly applied to the heater wire portion near one connection section. Furthermore, the second redundant wiring section, which is locally provided closer to the electromagnetic wave transmitting region than the other connection section of the heater wire, can disperse and reduce thermal stress repeatedly applied to the heater wire portion near the other connection section. Therefore, in the manufactured snow-melting radome, breakage of the heater wire can be prevented and durability of the heater wire against repeated use can be improved. Furthermore, by providing the first metal material and the second metal material, it is possible to prevent the resin substrate from being melted and damaged by heat generated when electrically connecting the connection section of the heater wire wired in the resin substrate to the wiring harness connection terminal. Furthermore, wiring the heater wire in the first resin substrate allows wiring of the heater wire in a suitable shape, which increases the flexibility of the shape of the first resin substrate and the snow-melting radome, as well as the flexibility of the wiring pattern and wiring density of the heater wire.

[0013] In the method for manufacturing a snow melting radome of the present invention, in the second step, the heater wire Tip side Part a first end redundant wiring portion connected to the one connecting portion; Separate from the first redundant wiring section The heater wire is locally formed at a position closer to the other connection portion than the other connection portion. the heater wire Tip side Part a second tip redundant wiring portion connected to the other connection portion; Separate from the second redundant wiring section It is characterized by being formed locally. This makes it possible to provide a snow-melting radome in which the first tip redundant wiring section can disperse and reduce the thermal stress repeatedly applied to the heater wire section near one of the connection sections, and the second tip redundant wiring section can disperse and reduce the thermal stress repeatedly applied to the heater wire section near the other connection section, thereby more reliably preventing breakage of the heater wire and further improving the durability of the heater wire against repeated use. [Effects of the Invention]

[0014] According to the present invention, it is possible to obtain a snow melting radome that can prevent breakage of the heater wire and improve the durability of the heater wire against repeated use. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1A is a front view of a snow melting radome according to a first embodiment of the present invention, and FIG. 1B is a partially enlarged front view of FIG. [Figure 2] FIG. 2 is a schematic vertical cross-sectional view of the snow melting radome of the first embodiment. [Figure 3] 4(a) to 4(d) are process explanatory diagrams of the manufacturing process of the snow melting radome of the first embodiment. [Figure 4] FIG. 2 is an explanatory diagram showing the state in which the first resin base material, the metal plate, the heater wire, and the wire harness connection terminal in the snow melting radome of the first embodiment are arranged inside a mold. [Figure 5] FIG. 4 is a partially enlarged front view of a first modified example of the snow melting radome of the first embodiment. [Figure 6] FIG. 10 is a partially enlarged front view of a second modified example of the snow melting radome of the first embodiment. [Figure 7] FIG. 10 is a partially enlarged front view of a third modified example of the snow melting radome of the first embodiment. [Figure 8] FIG. 10 is a partially enlarged front view of a fourth modified example of the snow melting radome of the first embodiment. [Figure 9] FIG. 10 is a schematic vertical cross-sectional view of the snow melting radome of the second embodiment in a state before the second resin base material is formed. [Figure 10] FIG. 11 is a schematic vertical cross-sectional view of the snow melting radome of the third embodiment before the second resin base material is formed. [Figure 11] FIG. 10 is a schematic vertical cross-sectional view of the snow melting radome of the fourth embodiment before the second resin base material is formed. DETAILED DESCRIPTION OF THE INVENTION

[0016] [Snow-melting radome of the first embodiment] A snow melting radome 1 according to a first embodiment of the present invention is used as a radome for an automotive radar device, such as a bumper cover attached to a vehicle bumper, and includes an electromagnetic wave-transmitting substrate 2, as shown in Figures 1 and 2. The substrate 2 is composed of a first resin base material 3 disposed on the opposite side to the viewing side, i.e., the radar device side, such as the automotive radar device, and a second resin base material 4 disposed on the viewing side, i.e., in front of the first resin base material 3. The first resin base material 3 and the second resin base material 4 are laminated together, and in the first embodiment, the first resin base material 3 and the second resin base material 4 are laminated and fixed to each other. If necessary, the second resin base material 4 may be disposed on the opposite side to the viewing side, and the first resin base material 3 may be disposed on the viewing side.

[0017] The first resin base material 3 and the second resin base material 4 are each formed of an insulating, electromagnetically transparent synthetic resin. The first resin base material 3 and the second resin base material 4 can be formed into any suitable shape within the applicable range, such as a flat plate or a curved plate. The first resin base material 3 and the second resin base material 4 can be made of different or the same synthetic resin. From the perspective of improving electromagnetic wave transmission performance, it is preferable to form the first resin base material 3 and the second resin base material 4 from materials whose refractive indices n, defined based on the complex dielectric constant, match or whose refractive indices n are approximately the same or close to each other. The numerical range of the refractive indices of the first resin base material 3 and the second resin base material 4 that are close to each other is preferably a difference of 0 to 10%.

[0018] Here, the refractive index n is a quantity defined by the real part of the relative dielectric constant εr' and the imaginary part of the relative dielectric constant εr" as in Equation 1. From the perspective of transparency, it is preferable that the magnitude of the dielectric loss tangent tanδ, defined by Equation 2 from the ratio of the imaginary part to the real part at the applicable frequency, be 0.1 or less. It is also preferable that the magnitude of the real part of the relative dielectric constant be 3 or less. By keeping the magnitudes of the dielectric loss tangent and the real part of the relative dielectric constant at these values ​​or less, it is possible to ensure the reduction of the reflectivity and internal loss required for the radome.

[0019]

number

[0020]

number

[0021] Any suitable synthetic resin can be used within the spirit and scope of the present invention for the first resin substrate 3 and the second resin substrate 4. Examples of suitable synthetic resins include acrylic resins such as polymethyl methacrylate (PMMA), polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), acrylonitrile-styrene-acrylate copolymer (ASA), acrylonitrile-ethylenepropyl rubber-styrene copolymer (AES), polypropylene (PP), polyphenylene ether (PPE), modified polyphenylene ether (m-PPE), and polystyrene (PS), either alone or in combination, and additives may be added. Foams may also be used for these synthetic resins. Furthermore, with regard to the thicknesses of the first resin base material 3 and the second resin base material 4 in the electromagnetic wave transmission direction, the ratio of the thickness of the first resin base material 3 to the thickness of the second resin base material 4, the thickness of the first base material resin 3, the thickness of the second resin base material 4, and the total thickness of the base 2 composed of the first resin base material 3 and the second resin base material 4 are appropriate within a range that can ensure the required electromagnetic wave transmission properties of the snow-melting radome 1.

[0022] In the snow-melting radome 1, heater wires 5 are wired in a predetermined pattern in the surface direction of the electromagnetic wave-transmitting substrate 2, which exhibits snow-melting function in the electromagnetic wave-transmitting region R. Any appropriate conductive material can be used for the heater wire 5 within the spirit and scope of the present invention, and preferred examples include copper, silver, silver-plated copper, copper-silver alloy, copper-nickel alloy, nickel-chromium alloy, iron-chromium alloy, transparent conductive film such as ITO film, and carbon fiber. Furthermore, the heater wire can take any form, including wire rod, conductive ink, and conductive filler-added materials.

[0023] The heater wire 5 in the illustrated example is formed as a continuous wire that meanders and folds back along the direction in which the plate-like base 2 expands, and the straight portions of the heater wire 5 are arranged side by side at intervals along the surface direction of the base 2 in and outside the electromagnetic wave irradiation area R of the base 2 by the radar device, and the directions of currents flowing in the straight portions of adjacent heater wires 5 are set to be approximately anti-parallel or anti-parallel to each other.

[0024] The heater wire 5 is embedded between the first resin base material 3 and the second resin base material 4, and is sandwiched between the first resin base material 3 and the second resin base material 4 and is disposed within and sealed in the base 2 formed of the first resin base material 3 and the second resin base material 4. In the first embodiment, the heater wire 5 is routed along a groove 31 formed on the surface of the first resin base material 3 that is fixed to the second resin base material 4, and another groove 41 formed on the surface of the second resin base material 4 that is fixed to the first resin base material 3 so as to face the groove 31, and the heater wire 5 is fixed to the first resin base material 3 and the second resin base material 4, respectively.

[0025] In a region other than the electromagnetic wave transmission region R of the base 2, which in the first embodiment is the region of the tab 21 that protrudes laterally, a first recess 32 and a second recess 33 are formed on the fixing surface side of the first resin base material 3 so as to be isolated from each other. A first metal plate 61 corresponding to a first metal material and a second metal plate 62 corresponding to a second metal material, both of which are electrically conductive, are fitted into the first recess 32 and the second recess 33, respectively. That is, the first metal plate 61 and the second metal plate 62 are embedded between the first resin base material 3 and the second resin base material 4 so as to be isolated from each other, and the first metal plate 61 and the second metal plate 62 are provided in an insulated state from each other.

[0026] One connection portion 51 of the heater wire 5 and one wire harness connection terminal 71 are placed on the mounting surface 611 of the first metal plate 61, and are arranged so that the one connection portion 51 of the heater wire 5 and one wire harness connection terminal 71 are in contact with each other (see FIGS. 2 and 3). The one connection portion 51 of the heater wire 5 and the one wire harness connection terminal 71 are fixed to the first metal plate 61, and are electrically connected to each other. In the first embodiment, the one connection portion 51 of the heater wire 5, the one wire harness connection terminal 71, and the first metal plate 61 are joined together integrally, by a joint 8 made of a joining material such as solder or brazing filler metal, or a joint 8 made of a welded part such as laser welding (see FIGS. 2, 3(d), and 4).

[0027] The other connection portion 52 of the heater wire 5 and the other wire harness connection terminal 72 are placed on the placement surface 621 of the second metal plate 62, and are arranged so as to be in contact with each other (see FIGS. 2 and 3). The other connection portion 52 of the heater wire 5 and the other wire harness connection terminal 72 are fixed to the second metal plate 62, and are thereby electrically connected to each other. In the first embodiment, the other connection portion 52 of the heater wire 5, the other wire harness connection terminal 72, and the second metal plate 62 are joined together integrally, by a joint 8 made of a joining material such as solder or brazing filler metal, or by a joint 8 made of a welded part such as laser welding (see FIGS. 2, 3(d), and 4).

[0028] Furthermore, in the first embodiment, the heater wire 5 is wired along the bonding surface between the first resin base material 3 and the second resin base material 4, and one connection portion 51 of the heater wire 5 that is not bent in the stacking direction of the first resin base material 3 and the second resin base material 4 is electrically connected to one wire harness connection terminal 71 that is arranged so as to overlap and contact the one connection portion 51 of the heater wire 5. Also, the other connection portion 52 of the heater wire 5 that is not bent in the stacking direction of the first resin base material 3 and the second resin base material 4 is electrically connected to another wire harness connection terminal 72 that is arranged so as to overlap and contact the other connection portion 52 of the heater wire 5 (see FIGS. 2 and 3(d)).

[0029] A first redundant wiring portion 53 is locally provided in a portion of the heater wire 5 closer to the electromagnetic wave transparent region R than one connection portion 51 of the heater wire 5. The first redundant wiring portion 53 is redundantly wired as part of the heater wire 5 in a position near one connection portion 51 between the electromagnetic wave transparent region R and one connection portion 51, and is fixed to the first resin base material 3 and the second resin base material 4. A second redundant wiring portion 54 is locally provided in a portion of the heater wire 5 closer to the electromagnetic wave transparent region R than the other connection portion 52 of the heater wire 5. The second redundant wiring portion 54 is redundantly wired as part of the heater wire 5 in a position near the other connection portion 52 between the electromagnetic wave transparent region R and the other connection portion 52, and is fixed to the first resin base material 3 and the second resin base material 4.

[0030] The first redundant wiring portion 53 is formed to meander in a direction perpendicular to the extension direction of one wire harness connection terminal 71, and in the first embodiment, is formed to meander in a rectangular wave shape bending at right angles or approximately right angles. The second redundant wiring portion 54 is formed to meander in a direction perpendicular to the extension direction of the other wire harness connection terminal 72, and in the first embodiment, is formed to meander in a rectangular wave shape bending at right angles or approximately right angles. The number of meander repetitions corresponding to one period of the rectangular wave in the first redundant wiring portion 53 and the second redundant wiring portion 54 is preferably one or more times, but two or more times is more preferable from the viewpoint of improving the dispersibility of thermal stress. Furthermore, the meandering fluctuation width W1, which corresponds to the fluctuation width of the rectangular wave in the first redundant wiring portion 53 and the second redundant wiring portion 54, is preferably 5 times or more, more preferably 10 times or more, the line width of the heater wire 5 from the viewpoint of improving the dispersibility of thermal stress, and is preferably 30 times or less the line width of the heater wire 5 from the viewpoint of reducing the installation space of the first redundant wiring portion 53 and the second redundant wiring portion 54.

[0031] When manufacturing the snow melting radome 1 of the first embodiment, a first recess 32 and a second recess 33 are formed so as to be isolated from each other on one surface of an electromagnetically transparent first resin base material 3. The first recess 32 and the second recess 33 may be formed by forming correspondingly shaped protrusions in a mold when forming the first resin base material 3 by injection molding, or may be formed by cutting the resin base material or the like. Furthermore, a first metal plate 61 and a second metal plate 62 are fitted and arranged in the first recess 32 and the second recess 33 formed so as to be isolated from each other in the first resin base material 3, respectively (see FIG. 3(a)).

[0032] Then, the heater wire 5 is laid in a predetermined pattern on one surface of the first resin base material 3, one connection portion 51 of the heater wire 5 is placed on the exposed mounting surface 611 of the first metal plate 61, and a first redundant wiring portion 53 is locally formed in a portion of the heater wire 5 closer to the electromagnetic wave transparent region R than the one connection portion 51 of the heater wire 5, and the other connection portion 52 of the heater wire 5 is placed on the exposed mounting surface 621 of the second metal plate 62, and a second redundant wiring portion 54 is locally formed in a portion of the heater wire 5 closer to the electromagnetic wave transparent region R than the other connection portion 52 of the heater wire 5 (see FIG. 3(b)). In this example, when laying the heater wire 5, the first resin base material 3 melts to form grooves 31 that bond to the heater wire 5. When laying the heater wire 5 in a predetermined pattern on one surface of the first resin base material 3, it is preferable to use, for example, ultrasonic vibration welding, printing, or the like.

[0033] Furthermore, one connection portion 51 of the heater wire 5 and one wire harness connection terminal 71 are placed on the exposed mounting surface 611 of the first metal plate 61, and the one connection portion 51 of the heater wire 5, the one wire harness connection terminal 71, and the first metal plate 61 that are in contact with each other are joined at a joint 8 from the exposed mounting surface 611 side to establish a conductive connection, and the one connection portion 51 of the heater wire 5, the one wire harness connection terminal 71, and the first metal plate 61 are fixed to the first metal plate 61. Similarly, the other connection portion 52 of the heater wire 5 and the other wire harness connection terminal 72 are placed on the exposed mounting surface 621 of the second metal plate 62, and the other connection portion 52 of the heater wire 5, the other wire harness connection terminal 72, and the second metal plate 62 that are in contact with each other are joined at the joint 8 from the exposed mounting surface 621 side to establish a conductive connection, and the other connection portion 52 of the heater wire 5 and the other wire harness connection terminal 72 are fixed to the second metal plate 62 (see FIGS. 3(c) and (d)).

[0034] 4, the heater wire 5, the first metal plate 61, the second metal plate 62, and the first resin base material 3 to which the wire harness connection terminals 71, 72 are attached are placed inside a mold 100 made of a split mold. At this time, the wire harness connection portion 7 from which the wire harness connection terminals 71, 72 are drawn is led out of the mold 100 through a lead-out port 102 formed in a part of the mold 100.

[0035] Then, injection molding is performed by pouring molten resin MR into the interior of the mold 100 through the injection port 101 of the mold 100, and the second resin base material 4 is formed by injection molding on the mounting surface 611 of the first metal plate 61 and the mounting surface 621 of the second metal plate 62, and the second resin base material 4 is fixed to the first resin base material 3. The interface of the second resin base material 4 laminated by injection molding is molded and welded to the first resin base material 3, the heater wire 5, the first metal plate 61, the one wire harness connection terminal 71, the second metal plate 62, and the other wire harness connection terminal 72, and the heater wire 5, the first metal plate 61, the one wire harness connection terminal 71, the second metal plate 62, the other wire harness connection terminal 72, and the joint 8 are embedded between the first resin base material 3 and the second resin base material 4.

[0036] Furthermore, since the second resin base material 4 is formed so as to cover the portion of the heater wire 5 that protrudes outside the groove 31, the portion of the heater wire 5 that protrudes outside the groove 31 is molded and fixed to the second resin base material 4 by insert molding, and the heater wire 5 is fitted into another groove 41 of the second resin base material 4. Note that the second resin base material 4 is not limited to a configuration formed by injection molding, and may be fixed to the first resin base material 3 by adhesion or the like, as necessary. After the second resin base material 4 is formed, the mold 100 is demolded to obtain the snow melting radome 1 of the first embodiment.

[0037] According to the first embodiment, the first redundant wiring part 53, which is locally provided closer to the electromagnetic wave transmitting region R than one connection part 51 of the heater wire 5, can disperse and reduce thermal stress repeatedly applied to the heater wire part near the one connection part 51, and the second redundant wiring part 54, which is locally provided closer to the electromagnetic wave transmitting region R than the other connection part 52 of the heater wire 5, can disperse and reduce thermal stress repeatedly applied to the heater wire part near the other connection part 52. Therefore, breakage of the heater wire 5 can be prevented and the durability of the heater wire 5 against repeated use can be improved.

[0038] Furthermore, by providing the first metal plate 61 and the second metal plate 62, it is possible to prevent the first resin base material 3 from being melted and damaged by heat generated when electrically connecting the connection portions 51, 52 of the heater wire 5 wired in the first resin base material 3 to the wire harness connection terminal 71.

[0039] Furthermore, by forming the first redundant wiring portion 53 and the second redundant wiring portion 54 in a serpentine manner, the redundant length of the serpentine path can more reliably distribute and reduce the thermal stress repeatedly applied to the heater wire portion, and more reliably reduce the effects of expansion and contraction due to thermal stress on the heater wire 5. Furthermore, the serpentine path can extend the length of the redundant path while ensuring the required line width of the heater wire 5 necessary for snow melting.

[0040] Furthermore, by wiring the heater wire 5 in the first resin base material 3, it becomes possible to wire the heater wire 5 in a first resin base material 3 of an appropriate shape, which increases the degree of freedom in the shape of the first resin base material 3 and the snow-melting radome 1, as well as the degree of freedom in the wiring pattern and wiring density of the heater wire 5.

[0041] [Snow Melting Radome of First Modification of First Embodiment] 5, the snow melting radome 1p of the first modified example of the first embodiment has a first redundant wiring portion 53p formed by meandering in a direction perpendicular to the extension direction of one wire harness connection terminal 71, and formed by meandering in a curved sinusoidal shape, and a second redundant wiring portion 54p formed by meandering in a direction perpendicular to the extension direction of the other wire harness connection terminal 72, and formed by meandering in a curved sinusoidal shape. The number of meander repetitions corresponding to one period of the sine wave in the first redundant wiring portion 53p and the second redundant wiring portion 54p is preferably one or more times, but two or more times is more preferable from the viewpoint of improving the dispersibility of thermal stress. Furthermore, the meandering fluctuation width W2, which corresponds to the fluctuation width of the sine wave in the first redundant wiring portion 53p and the second redundant wiring portion 54p, is preferably 5 times or more, and more preferably 10 times or more, the line width of the heater wire 5 from the viewpoint of improving the dispersibility of thermal stress, and is preferably 30 times or less the line width of the heater wire 5 from the viewpoint of reducing the installation space of the first redundant wiring portion 53p and the second redundant wiring portion 54p.

[0042] Other configurations of the snow melting radome 1p of the first modified example are the same as those of the snow melting radome 1 of the first embodiment. Moreover, the snow melting radome 1p of the first modified example can be manufactured by the same manufacturing process as the snow melting radome 1 of the first embodiment.

[0043] The snow melting radome 1p of the first modified example and the manufacturing method thereof can exhibit the corresponding effects from the configuration corresponding to the snow melting radome 1 of the first embodiment or the manufacturing method thereof.

[0044] [Snow Melting Radome of Second Modification of First Embodiment] 6, the snow melting radome 1q of the second modified example of the first embodiment has a first redundant wiring portion 53q formed to meander in a rectangular wave shape that meanders in the extension direction of one wire harness connection terminal 71 and bends at right angles or approximately right angles, and a second redundant wiring portion 54q formed to meander in a rectangular wave shape that meanders in the extension direction of another wire harness connection terminal 72 and bends at right angles or approximately right angles. The number of meander repetitions corresponding to one period of the rectangular wave in the first redundant wiring portion 53q and the second redundant wiring portion 54q is preferably one or more times, but two or more times is more preferable from the viewpoint of improving the dispersibility of thermal stress. Furthermore, the meandering fluctuation width W3, which corresponds to the fluctuation width of the rectangular wave in the first redundant wiring portion 53q and the second redundant wiring portion 54q, is preferably 5 times or more, and more preferably 10 times or more, the line width of the heater wire 5 from the viewpoint of improving the dispersibility of thermal stress, and is preferably 30 times or less the line width of the heater wire 5 from the viewpoint of reducing the installation space of the first redundant wiring portion 53q and the second redundant wiring portion 54q.

[0045] The other configurations of the snow melting radome 1q of the second modified example are the same as those of the snow melting radome 1 of the first embodiment. Moreover, the snow melting radome 1q of the second modified example can be manufactured using the same manufacturing process as the snow melting radome 1 of the first embodiment. Moreover, as a further modified example of the second modified example, the first redundant wiring portion 53q may be formed to meander in a sinusoidal shape that meanders and curves in the extension direction of one wire harness connection terminal 71, and the second redundant wiring portion 54q may be formed to meander in a limited wave shape that meanders and curves in the extension direction of the other wire harness connection terminal 72. In this case, the suitable number of repeated meanders and the suitable variation range of the meanders can be adopted from the configurations of the first modified example.

[0046] The snow melting radome 1q of the second modified example or a further modified example thereof and its manufacturing method can exhibit the corresponding effects from the configuration corresponding to the snow melting radome 1 of the first embodiment or its manufacturing method.

[0047] [Snow Melting Radome of Third Modification of First Embodiment] As shown in Fig. 7, the snow melting radome 1r of the third modified example of the first embodiment has a first redundant wiring section 53r formed in a spiral shape and a second redundant wiring section 54r formed in a spiral shape. The other configurations of the snow melting radome 1r of the third modified example are the same as those of the snow melting radome 1 of the first embodiment. Moreover, the snow melting radome 1r of the third modified example can be manufactured using the same manufacturing process as the snow melting radome 1 of the first embodiment.

[0048] The snow melting radome 1r of the third modified example or a further modified example thereof and its manufacturing method can exhibit the corresponding effects from the configuration corresponding to the snow melting radome 1 of the first embodiment or its manufacturing method.

[0049] [Snow Melting Radome of Fourth Modification of First Embodiment] 8, the snow melting radome 1s of the fourth modified example of the first embodiment has a first tip redundant wiring portion 55s that is connected to one connection portion 51 locally provided on the tip side of one connection portion 51 of the heater wire 5, and a second tip redundant wiring portion 56s that is connected to the other connection portion 52 locally provided on the tip side of the other connection portion 52 of the heater wire 5. The first tip redundant wiring portion 55s in the fourth modified example is formed to meander in the extension direction of one wire harness connection terminal 71, and the second tip redundant wiring portion 56s is formed to meander in the extension direction of the other wire harness connection terminal 72.

[0050] In the illustrated example, the first tip redundant wiring portion 55s is formed to meander in a rectangular wave shape that meanders in the extension direction of one wire harness connection terminal 71 and bends at right angles or approximately right angles, and the second tip redundant wiring portion 56s is formed to meander in a rectangular wave shape that meanders in the extension direction of the other wire harness connection terminal 72 and bends at right angles or approximately right angles, but the first tip redundant wiring portion 55s may be formed to meander in a sinusoidal wave shape that meanders in the extension direction of one wire harness connection terminal 71 and bends in a curved manner, and the second tip redundant wiring portion 56s may be formed to meander in a sinusoidal wave shape that meanders in the extension direction of the other wire harness connection terminal 72 and bends in a curved manner.

[0051] The number of meandering repetitions and the meandering variation range when the first end redundant wiring portion 55s and the second end redundant wiring portion 56s are formed to meander in a rectangular wave shape are preferably applied to the number of meandering repetitions and the meandering variation range when the first redundant wiring portion 53 and the second redundant wiring portion 54 in the first embodiment are formed to meander in a rectangular wave shape. Furthermore, the number of meandering repetitions and the meandering variation range when the first end redundant wiring portion 55s and the second end redundant wiring portion 56s are formed to meander in a sine wave shape are preferably applied to the number of meandering repetitions and the meandering variation range when the first redundant wiring portion 53p and the second redundant wiring portion 54p in the first modification of the first embodiment are formed to meander in a sine wave shape.

[0052] The other configurations of the snow melting radome 1s of the fourth modified example are the same as those of the snow melting radome 1 of the first embodiment. The snow melting radome 1s of the fourth modified example can be manufactured using basically the same manufacturing process as the snow melting radome 1 of the first embodiment. When wiring the heater wire 5 in a predetermined pattern on one surface of the first resin base material 3, the first tip redundant wiring portion 55s and the second tip redundant wiring portion 56s may be formed together. The first tip redundant wiring portion 55s connected to one connection portion 51 of the heater wire 5 may be locally formed more distally than one connection portion 51 of the heater wire 5, and the second tip redundant wiring portion 56s connected to the other connection portion 52 may be locally formed more distally than the other connection portion 52 of the heater wire 5. The first tip redundant wiring portion 55s and the second tip redundant wiring portion 56s may be formed in a meandering shape in a direction perpendicular to the extension direction of the wire harness connection terminals 71, 72, or in a spiral shape.

[0053] The snow melting radome 1s of the fourth modified example or a further modified example thereof and its manufacturing method can achieve corresponding effects due to the configuration corresponding to that of the snow melting radome 1 of the first embodiment or its manufacturing method. Furthermore, in the fourth modified example, the first tip redundant wiring portion 55s can also disperse and reduce thermal stress repeatedly applied to the heater wire portion near one connection portion 51, and the second tip redundant wiring portion 56s can also disperse and reduce thermal stress repeatedly applied to the heater wire portion near the other connection portion 52. Therefore, breakage of the heater wire 5 can be more reliably prevented, and the durability of the heater wire 5 against repeated use can be further improved.

[0054] Furthermore, the redundant length of the serpentine path of the first tip redundant wiring portion 55s and the second tip redundant wiring portion 56s can more reliably distribute and reduce the thermal stress repeatedly applied to the heater wire portion, and can more reliably reduce the effects of expansion and contraction due to thermal stress on the heater wire. In addition, the serpentine path can extend the length of the redundant path while ensuring the required wire width of the heater wire 5 necessary for snow melting.

[0055] [Snow-melting radome of the second embodiment] As shown in Fig. 9, a snow-melting radome 1a according to a second embodiment of the present invention comprises an electromagnetically transparent base 2a formed by stacking a first resin base material 3a and a second resin base material 4a. As in the first embodiment, a heater wire 5a is embedded between the first resin base material 3a and the second resin base material 4a. The heater wire 5a is wired in a predetermined pattern in the surface direction of the base 2a, so as to exhibit snow-melting function in the electromagnetic wave transparent region R. The heater wire 5a is laid on the surface of the first resin base material 3a facing the second resin base material 4a by electroless plating or printing using MID technology. The first resin base material 3a, the second resin base material 4a, and the heater wire 5a may be the same as the first resin base material 3, the second resin base material 4, and the heater wire 5 in the first embodiment.

[0056] In the snow melting radome 1a, as in the first embodiment, a first redundant wiring portion 53a is locally provided in a portion of the heater wire 5a closer to the electromagnetic wave transmission region R than one connection portion 51a of the heater wire 5a, and a second redundant wiring portion 54a is locally provided in a portion of the heater wire 5a closer to the electromagnetic wave transmission region R than the other connection portion 52a of the heater wire 5a (see FIGS. 9 and 1). The first redundant wiring portion 53a and the second redundant wiring portion 54a can have configurations similar to the first redundant wiring portion 53 and the second redundant wiring portion 54 in the first embodiment or their modifications, and it is also preferable to provide portions corresponding to the first tip redundant wiring portion 55s and the second tip redundant wiring portion 56s in the fourth modification.

[0057] One connection portion 51a of the heater wire 5a and one wire harness connection terminal 71a are fixed at a joint 8a, thereby electrically connecting the one connection portion 51a of the heater wire 5a and one wire harness connection terminal 71a. The other connection portion 52a of the heater wire 5a and another wire harness connection terminal 72a are also fixed at a joint 8a, thereby electrically connecting the other connection portion 52a of the heater wire 5a and another wire harness connection terminal 72a. The same configuration as the joint 8 in the first embodiment can be applied to the joint 8a.

[0058] In the snow melting radome 1a, the heater wire 5a, one wire harness connection terminal 71a, another wire harness connection terminal 72a, and the joint portion 8a are embedded between the first resin base material 3a and the second resin base material 4a.

[0059] When manufacturing the snow-melting radome 1a of the second embodiment, the heater wire 5a is laid in a predetermined pattern on one surface of the electromagnetic wave-transmitting first resin base material 3a by electroless plating, printing, etc., and a first redundant wiring portion 53a is locally formed in a portion of the heater wire 5a that is closer to the electromagnetic wave-transmitting region R than one connection portion 51a of the heater wire 5a, and a second redundant wiring portion 54a is locally formed in a portion of the heater wire 5a that is closer to the electromagnetic wave-transmitting region R than the other connection portion 52a of the heater wire 5a.

[0060] Furthermore, one connection portion 51a of the heater wire 5a is brought into contact with one wire harness connection terminal 71a and joined at a joint 8a for conductive connection, and one connection portion 51a of the heater wire 5a is fixed to one wire harness connection terminal 71a. Similarly, the other connection portion 52a of the heater wire 5a is brought into contact with another wire harness connection terminal 72a and joined at a joint 8a for conductive connection, and the other connection portion 52a of the heater wire 5a is fixed to another wire harness connection terminal 72a.

[0061] Thereafter, the second resin base material 4a is formed by a process such as injection molding or bonding similar to that for the second resin base material 4 in the first embodiment, and is fixed to the first resin base material 3a (see Figures 9 and 4), and the heater wire 5a, one wire harness connection terminal 71a, the other wire harness connection terminal 72a, and the joint 8a are embedded between the first resin base material 3a and the second resin base material 4a, thereby obtaining the snow melting radome 1a of the second embodiment.

[0062] According to the snow melting radome 1a of the second embodiment or the manufacturing method thereof, the corresponding effects can be obtained from the configuration corresponding to the first embodiment.

[0063] [Snow-melting radome of the third embodiment] As shown in Figure 10, the snow-melting radome 1b of the third embodiment according to the present invention has an electromagnetic wave-transmitting base 2b formed by stacking a first resin base material 3b and a second resin base material 4b, and similar to the first embodiment, heater wires 5b are embedded between the first resin base material 3b and the second resin base material 4b and are wired in a predetermined pattern in the surface direction of the base 2b so as to exhibit snow-melting function in the electromagnetic wave-transmitting region R.

[0064] The heater wire 5b is wired by fixing a heat generating sheet 501b, in which the main portion of the heater wire 5b is embedded or fixed in an electromagnetic wave transparent resin film 502b, to the surface of the first resin base material 3b facing the second resin base material 4b with a fixing layer 503b such as double-sided tape or an adhesive layer. At least the areas of one connection portion 51b and the other connection portion 52b of the heater wire 5b facing the second resin base material 4b are exposed from the resin film 502b. The first resin base material 3b, the second resin base material 4b, and the heater wire 5b can be the same as the first resin base material 3, the second resin base material 4, and the heater wire 5 in the first embodiment.

[0065] In the snow melting radome 1b, as in the first embodiment, a first redundant wiring portion 53b is locally provided in a portion of the heater wire 5b closer to the electromagnetic wave transmission region R than one connection portion 51b of the heater wire 5b, and a second redundant wiring portion 54b is locally provided in a portion of the heater wire 5b closer to the electromagnetic wave transmission region R than the other connection portion 52b of the heater wire 5b (see FIGS. 10 and 1). In the example of FIG. 10, the first redundant wiring portion 53b and the second redundant wiring portion 54b are embedded in a resin film 502b. The first redundant wiring portion 53b and the second redundant wiring portion 54b can have the same configuration as the first redundant wiring portion 53 and the second redundant wiring portion 54 in the first embodiment or their modifications, and it is also preferable to provide portions corresponding to the first end redundant wiring portion 55s and the second end redundant wiring portion 56s in the fourth modification.

[0066] One connection portion 51b of the heater wire 5b and one wire harness connection terminal 71b are fixed at a joint 8b, thereby electrically connecting the one connection portion 51b of the heater wire 5b and the one wire harness connection terminal 71b. The other connection portion 52b of the heater wire 5b and another wire harness connection terminal 72b are also fixed at a joint 8b, thereby electrically connecting the other connection portion 52b of the heater wire 5b and another wire harness connection terminal 72b. The same configuration as the joint 8 in the first embodiment can be applied to the joint 8b.

[0067] In the snow melting radome 1b, the heater wire 5b, one wire harness connection terminal 71b, another wire harness connection terminal 72b, and the joint portion 8b are embedded between the first resin base material 3b and the second resin base material 4b.

[0068] When manufacturing the snow-melting radome 1b of the third embodiment, a heat generating sheet 501b is used in which the first redundant wiring section 53b and the second redundant wiring section 54b are formed in advance and one connection section 51b and the other connection section 52b of the heater wire 5b are exposed, and the resin film 502b of the heat generating sheet 501b is fixed to one surface of the electromagnetic wave-transparent first resin base material 3b with an adhesive layer 503b.

[0069] Furthermore, one connection portion 51b of the heater wire 5b is brought into contact with one wire harness connection terminal 71b and joined at a joint 8b for conductive connection, and one connection portion 51b of the heater wire 5b is fixed to one wire harness connection terminal 71b. Similarly, the other connection portion 52b of the heater wire 5b is brought into contact with another wire harness connection terminal 72b and joined at a joint 8b for conductive connection, and the other connection portion 52b of the heater wire 5b is fixed to another wire harness connection terminal 72b.

[0070] Thereafter, the second resin base material 4b is formed by a process such as injection molding or bonding similar to that for the second resin base material 4 in the first embodiment, and is fixed to the first resin base material 3b via a heat generating sheet 501b or a resin film 502b (see Figures 10 and 4), and the heater wire 5b, one wire harness connection terminal 71b, the other wire harness connection terminal 72b, and the joint 8b are embedded between the first resin base material 3b and the second resin base material 4b, thereby obtaining the snow melting radome 1b of the third embodiment.

[0071] According to the snow melting radome 1b of the third embodiment or the manufacturing method thereof, the corresponding effects can be obtained from the configuration corresponding to the first embodiment.

[0072] [Snow-melting radome of the fourth embodiment] As shown in Figure 11, the snow-melting radome 1c of the fourth embodiment according to the present invention has an electromagnetic wave-transmitting base 2c formed by stacking a first resin base material 3c and a second resin base material 4c, and similarly to the first embodiment, a heater wire 5c is buried between the first resin base material 3c and the second resin base material 4c, and is wired in a predetermined pattern in the surface direction of the base 2c so as to exhibit a snow-melting function in the electromagnetic wave-transmitting region R.

[0073] The heater wire 5c is wired by fixing an FPC heater 511c, on which the heater wire 5c is wired in a predetermined pattern, to the surface of the first resin base material 3c facing the second resin base material 4c with a fixing layer 514c such as double-sided tape or an adhesive layer. The FPC heater 511c is configured by wiring the heater wire 5c in a predetermined pattern on one surface of a flexible base material 512c such as a polyimide film, and sealing the main part of the heater wire 5c except for one connection portion 51c and the other connection portion 52c with a sealing portion 513c such as polyimide. The one connection portion 51c and the other connection portion 52c are exposed from the sealing portion 513c. The first resin base material 3c, the second resin base material 4c, and the heater wire 5c can be similar to the first resin base material 3, the second resin base material 4, and the heater wire 5 in the first embodiment.

[0074] In the snow melting radome 1c, as in the first embodiment, a first redundant wiring portion 53c is locally provided in a portion of the heater wire 5c closer to the electromagnetic wave transmission region R than one connection portion 51c of the heater wire 5c, and a second redundant wiring portion 54c is locally provided in a portion of the heater wire 5c closer to the electromagnetic wave transmission region R than the other connection portion 52c of the heater wire 5c (see FIGS. 11 and 1). In the example of FIG. 11, the first redundant wiring portion 53c and the second redundant wiring portion 54c are embedded and sealed in a sealing portion 513c. The first redundant wiring portion 53c and the second redundant wiring portion 54c can have the same configuration as the first redundant wiring portion 53 and the second redundant wiring portion 54 in the first embodiment or their modifications, and it is also preferable to provide portions corresponding to the first end redundant wiring portion 55s and the second end redundant wiring portion 56s in the fourth modification.

[0075] One connection portion 51c of the heater wire 5c and one wire harness connection terminal 71c are fixed at a joint 8c, thereby electrically connecting the one connection portion 51c of the heater wire 5c and the one wire harness connection terminal 71c. The other connection portion 52c of the heater wire 5c and another wire harness connection terminal 72c are also fixed at a joint 8c, thereby electrically connecting the other connection portion 52c of the heater wire 5c and another wire harness connection terminal 72c. The same configuration as the joint 8 in the first embodiment can be applied to the joint 8c.

[0076] In the snow melting radome 1c, the heater wire 5c, one wire harness connection terminal 71c, another wire harness connection terminal 72c, and the joint portion 8c are embedded between the first resin base material 3c and the second resin base material 4c.

[0077] When manufacturing the snow-melting radome 1c of the fourth embodiment, an FPC heater 511c is used in which the first redundant wiring portion 53c and the second redundant wiring portion 54c are formed in advance and one connection portion 51c and the other connection portion 52c of the heater wire 5c are exposed, and the flexible base material 512c of the FPC heater 511c is fixed to one surface of the electromagnetic wave-transparent first resin base material 3c with a fixing layer 514c.

[0078] Furthermore, one connection portion 51c of the heater wire 5c is brought into contact with one wire harness connection terminal 71c and joined at a joint 8c for conductive connection, and one connection portion 51c of the heater wire 5c is fixed to one wire harness connection terminal 71c. Similarly, the other connection portion 52c of the heater wire 5c is brought into contact with another wire harness connection terminal 72c and joined at a joint 8c for conductive connection, and the other connection portion 52c of the heater wire 5c is fixed to another wire harness connection terminal 72c.

[0079] Thereafter, the second resin base material 4c is formed by a process such as injection molding or bonding similar to that for the second resin base material 4 in the first embodiment, and is fixed to the first resin base material 3c via the FPC heater 511c or the flexible base material 512c (see Figures 11 and 4), and the heater wire 5c, one wire harness connection terminal 71c, the other wire harness connection terminal 72c, and the joint 8c are embedded between the first resin base material 3c and the second resin base material 4c, thereby obtaining the snow melting radome 1c of the fourth embodiment.

[0080] According to the snow melting radome 1c of the fourth embodiment or the manufacturing method thereof, the corresponding effects can be obtained from the configuration corresponding to the first embodiment.

[0081] [Scope of the invention disclosed herein] The inventions disclosed in this specification include, in addition to the individual inventions and embodiments listed as inventions, those specified by modifying partial contents of these with other contents disclosed in this specification, those specified by adding other contents disclosed in this specification to these contents, or those specified by deleting partial contents of these to the extent that partial effects are obtained and creating a generic concept. The inventions disclosed in this specification also include the following modifications and additions.

[0082] For example, in the first embodiment and its modified examples, the first recess 32, the second recess 33, etc., and the fitted first metal plate 61, the second metal plate 62, etc. are provided in the region of the tab 21 that is formed to protrude laterally when the radome is viewed from the front, and the connecting portions 51, 52, etc. of the heater wire 5 and the wire harness connecting terminals 71, 72 are electrically connected within the region of the first metal plate 61, the second metal plate 62, etc. when viewed from the front. However, for example, in the case of a radome that does not have the tab 21, this configuration can be provided in an appropriate region other than the region of the tab 21, outside the electromagnetic wave transparent region R. Similarly, the locations where the connecting portions 51a, 52a, 51b, 52b, 51c, 52c, etc. of the heater wires 5a, 5b, 5c and the wire harness connecting terminals 71a, 72a, 71b, 72b, 71c, 72c are electrically connected can also be provided in an appropriate region other than the electromagnetic wave transparent region R in the second to fourth embodiments. Furthermore, the first metal material and the second metal material in the present invention are not limited to plate-shaped first metal plates and second metal plates, but may be any appropriate metal material, and may be, for example, metal parts.

[0083] Furthermore, the redundancy aspects of the first redundant wiring section, second redundant wiring section, first tip redundant wiring section, and second tip redundant wiring section in the present invention can be aspects other than the above examples within the applicable range, and for example, the first redundant wiring section, second redundant wiring section, first tip redundant wiring section, and second tip redundant wiring section may be formed in an arc shape or an approximately L-shape, etc.

[0084] The snow melting radome of the present invention may also be suitably configured as a radome other than a radome for an on-vehicle radar device that is installed on the electromagnetic wave irradiation side of the on-vehicle radar device. [Industrial Applicability]

[0085] The present invention can be used in a snow-melting radome such as a radome for an on-vehicle radar device. [Explanation of symbols]

[0086] REFERENCE SIGNS 1, 1p, 1q, 1r, 1s, 1a, 1b, 1c...snow melting radome 2, 2a, 2b, 2c...base 21...tab 3, 3a, 3b, 3c...first resin base material 31...groove 32...first recess 33...second recess 4, 4a, 4b, 4c...second resin base material 41...groove 5, 5a, 5b, 5c...heater wire 51, 51a, 51b, 51c...one connection portion 52, 52a, 52b, 52c...other connection portion 53, 53p, 53q, 53r, 53a, 53b, 53c...first redundant wiring portion 54, 54p, 54q, 54r, 54a, 54b, 54c...second redundant wiring portion 55s...first tip redundant wiring portion 56s...second tip redundant wiring portion 501b...heat generating sheet 502b...resin film 503b...adhering layer 511c...FPC heater 512c...flexible base material 513c...sealing portion 514c...adhering layer 61...first metal plate 611...mounting surface 62...second metal plate 621...mounting surface 71, 71a, 71b, 71c...one wire harness connection terminal 72, 72a, 72b, 72c...other wire harness connection terminal 8, 8a, 8b, 8c...joint portion 100...mold 101...inlet 102...outlet R...electromagnetic wave transmission area W1, W2, W3...meandering variation width MR...molten resin

Claims

1. a first resin base material and a second resin base material are laminated to form an electromagnetic wave transparent radome base body; a heater wire wired in a surface direction of the radome base body is embedded between the first resin base material and the second resin base material; One connection portion of the heater wire is electrically connected to one wire harness connection terminal, The other connection portion of the heater wire is electrically connected to another wire harness connection terminal, and a first redundant wiring portion is locally provided in a portion of the heater wire closer to the electromagnetic wave transmission region than one connection portion of the heater wire; the first redundant wiring portion is fixed to the first resin base material and the second resin base material; a second redundant wiring portion is locally provided in a portion of the heater wire closer to the electromagnetic wave transmission region than the other connection portion of the heater wire; The snow melting radome is characterized in that the second redundant wiring portion is fixed to the first resin base material and the second resin base material.

2. a first metal material and a second metal material are embedded between the first resin base material and the second resin base material in a region other than the electromagnetic wave transmitting region of the radome base so as to be isolated from each other; one connection portion of the heater wire and one wire harness connection terminal are placed on a placement surface of the first metal material, and one connection portion of the heater wire and one wire harness connection terminal are fixed to the first metal material, thereby electrically connecting one connection portion of the heater wire and one wire harness connection terminal, The snow melting radome described in claim 1, characterized in that the other connection portion of the heater wire and the other wire harness connection terminal are placed on the mounting surface of the second metal material, and the other connection portion of the heater wire and the other wire harness connection terminal are fixed to the second metal material, thereby electrically connecting the other connection portion of the heater wire and the other wire harness connection terminal.

3. the first redundant wiring portion is formed in a meandering manner, 3. The snow melting radome according to claim 1, wherein the second redundant wiring portion is formed in a serpentine shape.

4. 4. The snow melting radome according to claim 3, wherein the number of meandering repetitions in each of the first redundant wiring section and the second redundant wiring section is one or more, and the meandering variation range is five times or more the line width of the heater wire.

5. a first distal end redundant wiring portion connected to one connection portion of the heater wire is locally provided in a portion of the heater wire closer to the distal end than the one connection portion of the heater wire, separately from the first redundant wiring portion; 3. The snow melting radome according to claim 1, wherein a second tip redundant wiring portion connected to the other connection portion of the heater wire is locally provided separately from the second redundant wiring portion at a portion of the heater wire closer to the tip than the other connection portion of the heater wire.

6. the first end redundant wiring portion is formed in a meandering manner, 6. The snow melting radome according to claim 5, wherein the second tip redundant wiring portion is formed in a serpentine shape.

7. a first step of fitting and arranging a first metal material and a second metal material into a first recess and a second recess, respectively, which are formed so as to be isolated from each other on one surface of an electromagnetic wave-transmitting first resin substrate; a second step of wiring a heater wire in a predetermined pattern on one surface of the first resin base material, placing one connection portion of the heater wire on the mounting surface where the first metal material is exposed, and locally forming a first redundant wiring portion in a portion of the heater wire closer to the electromagnetic wave transmitting region than the one connection portion of the heater wire, and placing the other connection portion of the heater wire on the mounting surface where the second metal material is exposed, and locally forming a second redundant wiring portion in a portion of the heater wire closer to the electromagnetic wave transmitting region than the other connection portion of the heater wire; a third step of placing one wire harness connection terminal on an exposed mounting surface of the first metal material, and fixing one connection portion of the heater wire and the one wire harness connection terminal to the first metal material, thereby electrically connecting the one connection portion of the heater wire and the one wire harness connection terminal, and placing another wire harness connection terminal on an exposed mounting surface of the second metal material, and fixing the other connection portion of the heater wire and the other wire harness connection terminal to the second metal material, thereby electrically connecting the other connection portion of the heater wire and the other wire harness connection terminal; a fourth step of forming an electromagnetic wave transparent second resin base material by injection molding on the side of the mounting surface of the first metal material and the side of the mounting surface of the second metal material, fixing the second resin base material to the first resin base material to form a radome base, burying the heater wire, the first metal material, the one wire harness connection terminal, the second metal material, and the other wire harness connection terminal between the first resin base material and the second resin base material, fixing the first redundant wiring portion to the first resin base material and the second resin base material, and fixing the second redundant wiring portion to the first resin base material and the second resin base material.

8. 8. The method for manufacturing a snow melting radome according to claim 7, wherein in the second step, a first tip redundant wiring portion connected to one of the connection portions of the heater wire is locally formed separately from the first redundant wiring portion in a portion of the heater wire closer to the tip than the one connection portion, and a second tip redundant wiring portion connected to the other connection portion is locally formed separately from the second redundant wiring portion in a portion of the heater wire closer to the tip than the other connection portion.

Images