Vehicular window glass

Abstract

Provided is a vehicular window glass in which a wide heating region and a high gain antenna can coexist.　The vehicular window glass (100) according to one embodiment of the present invention has: a glass plate (120) that is attached to an opening of a frame material (150) and has a first main surface (126); bus bars (131), (132) that are formed on the first main surface (126); a plurality of electric heating wires (133) that are connected to the bus bars (131), (132); and a slot antenna (140) that is disposed on the first main surface (126). The slot antenna (140) has a first power feeding unit (141), a first element (142), a second power feeding unit (143), and a second element (144). At least a portion of the first element (142) is connected to or in proximity to a portion of the plurality of electric heating wires (133).

Description

Vehicle window glass

[0001] The present invention relates to a vehicle window glass.

[0002] A defogger may be printed on a main surface of a glass pane to provide functions such as ice melting and anti-fogging. The defogger includes a plurality of heating wires and a bus bar connected to the plurality of heating wires. The plurality of heating wires are printed using, for example, a metal-containing ink and have the property of reflecting radio waves. When the plurality of heating wires are close to an antenna in a plan view of the glass pane, there is a risk of a significant decrease in antenna gain. Therefore, the technology disclosed in Patent Document 1 ensures antenna gain by providing an unheated area near the antenna where the plurality of heating wires are not present.

[0003] Japanese Patent Application Laid-Open No. 2022-143548

[0004] Increasing the heating area would expand the area that has functions such as de-icing and anti-fogging, which means that it is expected that the area in which the outside of the vehicle can be clearly seen from inside the vehicle will also be expanded. Therefore, there was a need to develop technology that would allow both a wide heating area and a high-gain antenna to coexist.

[0005] In view of the above problems, an object of the present invention is to provide a vehicle window glass that allows both a wide heating area and a high-gain antenna to coexist.

[0006] A vehicle window glass according to one aspect of the present disclosure has the following configuration.

[0007] [1] A vehicle window glass that is attached to an opening formed by a conductive frame material provided on a vehicle body, the vehicle window glass comprising: a glass plate having a first main surface; a pair of bus bars formed on the first main surface; a plurality of heating wires provided between the pair of bus bars; and a slot antenna arranged on the first main surface, the slot antenna comprising: a first power feed portion, a first element connected to the first power feed portion, a second power feed portion, and a second element connected to the second power feed portion, and at least a portion of the first element overlaps with or is adjacent to a portion of the plurality of heating wires.

[0008] [2] The vehicle window glass according to [1], wherein the first power supply portion is a core-wire-side power supply portion, and the second power supply portion is a ground-side power supply portion.

[0009] [3] The vehicle window glass according to [1] or [2], wherein the first element has a strip-shaped portion at least in a part thereof, and a part of the strip-shaped portion overlaps with or is adjacent to a part of the plurality of heating wires.

[0010] [4] The vehicle window glass according to any one of [1] to [3], wherein the first element has a linear first linear portion at least in a part thereof, and a part of the first element is disposed in proximity to the frame material.

[0011] [5] The vehicle window glass according to any one of [1] to [3], wherein a distance from the heating wire closest to the slot antenna among the plurality of heating wires to the outer periphery of the glass plate is 60 mm or less.

[0012] [6] The vehicle window glass according to any one of [1] to [3], wherein the first element has a loop shape, the second power supply portion and the second element are disposed inside the first element, and at least one of the second power supply portion and the second element is capacitively coupled to at least one of the first power supply portion and the first element.

[0013] [7] The vehicle window glass according to [4], wherein the first element has a band-shaped portion at least in a part thereof, a part of the band-shaped portion overlapping with or adjacent to the plurality of heating wires, and the first linear portion and the band-shaped portion forming a loop shape.

[0014] [8] The vehicle window glass according to [3], wherein the first power supply portion is formed continuously with the band-shaped portion and is disposed inside the loop.

[0015] [9] The vehicle window glass according to any one of [1] to [8], wherein the second power supply portion is arranged in the vicinity of the first power supply portion at a predetermined distance.

[0016]

[10] The vehicle window glass according to any one of [1] to [9], wherein the pair of bus bars are arranged along two opposing sides of the glass plate, respectively.

[0017] The present invention can provide a vehicle window glass that can accommodate both a wide heating area and a high-gain antenna.

[0018] Fig. 1 is a schematic front view showing a configuration example of a vehicle window glass according to embodiment 1. Fig. 2 is a schematic enlarged front view showing a configuration example of a vehicle window glass according to embodiment 1. Fig. 3 is a schematic cross-sectional view showing a configuration example of a vehicle window glass according to embodiment 1. Fig. 4 is a schematic front view showing a configuration example of a slot antenna according to a modified example. Fig. 5 is a graph illustrating antenna gain.

[0019] <Embodiment 1> Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each drawing, the same or corresponding elements are assigned the same reference numerals, and for clarity of explanation, duplicate explanations will be omitted as necessary. Note that for ease of understanding, the scale of each part in the drawings may differ from the actual scale. Deviations in directions such as parallel, right-angled, orthogonal, horizontal, vertical, up-down, left-right, etc. are allowed to the extent that they do not impair the effects of the embodiment. The shape of the corners is not limited to right angles and may be rounded in an arched shape.

[0020] Examples of the vehicle window glass in the embodiment of the present invention include a rear window attached to the rear of the vehicle, a windshield attached to the front of the vehicle, a side window attached to the side of the vehicle, and a roof glass attached to the roof of the vehicle. The vehicle window glass is not limited to these examples. A rear window glass is particularly suitable as the vehicle window glass in the embodiment of the present invention.

[0021] FIG. 1 is a schematic front view illustrating a case where a vehicle window glass according to the present invention is applied to a rear window. As shown in FIG. 1, the vehicle window glass 100 includes at least a glass plate 120, a defogger 130, a slot antenna 140, and a frame material 150 (not shown in FIG. 1). As shown in FIG. 3, the vehicle window glass 100 may further include components such as a light-shielding film 160. The frame material 150 is a conductive part of the vehicle body and forms, for example, a rectangular opening. The glass plate 120 is attached to the opening provided in the frame material 150 and used as the vehicle window glass. As shown in FIG. 3, the glass plate 120 is attached to the frame material 150 using an adhesive member 170. The conductive material forming the frame material 150 is, for example, a metal such as steel. FIG. 1 is a schematic view of the vehicle window glass 100 viewed from the interior of the vehicle, with the glass plate 120 attached to the opening provided in the frame material 150. In order to simplify the drawing, the frame material 150, the light-shielding film 160, and the adhesive member 170 are omitted from FIG.

[0022] The defogger 130 includes bus bars 131 and 132 and a plurality of heating wires 133. In the example shown in FIG. 1 , the bus bars 131 and 132 are a pair of bus bars. In the example shown in FIG. 1 , the pair of bus bars 131 and 132 are strip-shaped electrodes and extend along the sides of the glass plate 120. For example, the pair of bus bars 131 and 132 may be arranged to extend along opposing sides of the glass plate 120. The pair of bus bars 131 and 132 are electrically connected to different electrode terminals of a power source (not shown). For example, the bus bar 131 may be connected to a negative terminal of the power source, and the bus bar 132 may be connected to a positive terminal of the power source. The bus bars 131 and 132 and the plurality of heating wires 133 are printed on the main surface of the glass plate 120 by, for example, screen printing.

[0023] The multiple heating wires 133 are arranged between the pair of bus bars 131, 132. One end of each of the multiple heating wires 133 is connected to the bus bar 131, and the other end is connected to the bus bar 132. The multiple heating wires 133 are arranged at intervals from one another in a direction perpendicular to the extension direction. The multiple heating wires 133 are components through which a direct current flows when a direct current voltage is applied between the pair of bus bars 131, 132 from a power source. The multiple heating wires 133 generate heat due to resistance when a current flows through them, thereby melting snow, ice, and preventing fogging in the area of ​​the glass sheet 120 where the multiple heating wires 133 are provided and in the vicinity thereof. Hereinafter, the area where the multiple heating wires 133 are arranged may be referred to as the heated area. The multiple heating wires 133 may be short-circuited by short-circuiting wires 134. The short-circuiting wires 134 are heating wires that extend in a direction perpendicular to the extension direction of the multiple heating wires 133. 1, two short-circuit wires 134 are provided, but there is no particular limitation on the number of short-circuit wires 134. Also, the short-circuit wires 134 do not necessarily have to be provided.

[0024] The glass plate 120 may be a single glass plate or a laminated glass. A single glass plate is a glass plate consisting of a single glass plate. The type of glass constituting the glass plate 120 is not particularly limited. The glass plate 120 may be inorganic glass such as soda-lime silicate glass, aluminosilicate glass, alkali-free glass, or borosilicate glass, or organic glass such as polycarbonate glass or acrylic resin glass. The glass plate 120 may be colorless glass such as clear glass, or colored glass such as privacy glass. The glass plate 120 may also be tempered glass such as physically tempered glass or chemically tempered glass. Tempered glass may be, for example, untempered glass with a compressive stress layer formed on the surface. Tempered glass may also be air-cooled tempered glass, which is tempered by heating and then rapidly cooling a glass plate. For example, when the vehicle window glass 100 is used as a rear window, air-cooled tempered glass is suitable for the glass plate 120.

[0025] Laminated glass is a glass sheet formed by bonding multiple glass sheets with an interlayer film disposed between the glass sheets. The interlayer film is made of, for example, a transparent resin. Examples of resins that make up the interlayer film include polyvinyl butyral (PVB), polyvinyl chloride, ethylene vinyl acetate (EVA), cycloolefin polymer, urethane resin, and polyvinylidene fluoride (PVDF). The interlayer film may be colorless or colored. The interlayer film may be colored, for example, by being made of a resin containing a colorant such as a pigment.

[0026] When the glass plate 120 is a laminated glass, a conductive film may be sandwiched between the glass plates. The conductive film is a film that operates using an electric signal, such as a light control film. Examples of materials that can be used as the light-controlling film include suspended particle devices (SPDs), polymer dispersed liquid crystals (PDLCs), polymer network liquid crystals (PNLCs), guest-host liquid crystals (GHLCs), twisted nematic (TN) liquid crystals, phase change (PC) liquid crystals, super twisted nematic (STN) liquid crystals, electrically controlled birefringence (ECB) liquid crystals, optically compensated bend (OCB) liquid crystals, in-place switching (IPS) liquid crystals, vertical alignment (VA) liquid crystals, fringe field switching (FFS) liquid crystals, field-induced photoreactive alignment (FPA) liquid crystals, electrochromic elements, electrokinetic elements, organic electroluminescence (EL) elements, and inorganic EL elements.

[0027] When the glass plate 120 is laminated glass, various functional layers may be provided on the main surfaces of the multiple glass plates according to the purpose. Examples of functional layers include metal films such as Ag (silver) films, metal oxide films such as ITO (indium tin oxide) films, resin films containing conductive particles, laminates of multiple types of films, resin films such as polyethylene terephthalate coated by vapor deposition, and low-emissivity films such as Low-E (Low Emissivity) films that exhibit low emissivity performance. For example, a low-emissivity film may be provided on the main surface of the exterior glass plate of the multiple glass plates facing the interior of the vehicle. Here, low-emissivity refers to reducing heat transfer due to radiation. Low-emissivity films such as Low-E films ensure thermal insulation by suppressing heat transfer due to radiation. The low-emissivity film may be a conventional film, such as a laminate film including a transparent dielectric film, an infrared reflective film, and a transparent dielectric film in this order. Typical transparent dielectric films include metal oxides and metal nitrides. Typical metal oxides include zinc oxide and tin oxide. A typical example of the infrared reflective film is a metal film. A typical example of the metal film is silver (Ag). Here, one or more layers of the infrared reflective film may be formed between the transparent dielectric films.

[0028] The slot antenna 140 may be used as a receiving antenna for receiving radio waves outside the vehicle, such as broadcast waves, or as a wireless communication antenna for transmitting and receiving radio waves to and from communication devices outside the vehicle. The slot antenna 140 is an antenna configured to receive radio waves in the UHF (Ultra High Frequency) band, for example, having a frequency of 300 MHz to 3 GHz. Specific examples of frequency bands included in the UHF band include the band of terrestrial digital television broadcast waves (e.g., 473 MHz to 713 MHz). The slot antenna 140 may be an antenna configured to receive radio waves in the VHF (Very High Frequency) band, for example, having a frequency of 30 MHz to 300 MHz. Specific examples of frequency bands included in the VHF band include the band of FM broadcast waves (e.g., 76 MHz to 108 MHz) and the band of DAB Band III (e.g., 170 MHz to 240 MHz). The slot antenna 140 is an antenna configured to be able to receive radio waves in the 760 MHz frequency band of ITS (Intelligent Transport Systems), for example.

[0029] 2 , the first power supply portion 141 is a core-side power supply portion and is an electrode electrically connected to a power supply line (not shown). The first element 142 is a loop-shaped member connected to the first power supply portion 141. For example, the first element 142 may satisfy the following formula (1), where λa is the wavelength in air of the maximum frequency in the frequency band used for transmission and reception by the slot antenna 140, λb is the wavelength in air of the minimum frequency, k is the wavelength shortening rate of the vehicle window glass 100, and L is the perimeter of the loop shape of the first element 142, i.e., the total length of the inner periphery of the first element 142: λa*k≦L≦2*λb*k ... formula (1)

[0030] As shown in Figure 2, the first element 142 may have a shape in which the central portion of a horizontally elongated rectangular conductor layer extending along the outer edge of the second glass plate 122 is cut out. In this case, at least one long side of the first element 142 is disposed close to the outer edge of the glass plate 120, i.e., close to the frame material 150 (see Figure 3). Note that "at least one long side of the first element 142 is close to the outer edge of the glass plate 120" means that at least one long side of the first element 142 is disposed approximately 10 mm away from the outer edge of the glass plate 120. In this case, at least one long side of the first element 142 is disposed approximately 30 mm away from the frame material 150.

[0031] The second feeding portion 143 is a ground-side feeding portion and is an electrode connected to the ground. By using the first feeding portion 141 as a core-side feeding portion and the second feeding portion 143 as a ground-side feeding portion, the input to the slot antenna 140 can be a balanced input, thereby improving the gain of the slot antenna 140. The second element 144 is a member connected to the second feeding portion 143. As shown in FIG. 2 , the second feeding portion 143 and the second element 144 are disposed inside the first element 142.

[0032] At least one of the second power supply portion 143 and the second element 144 is capacitively coupled to at least one of the first power supply portion 141 and the first element 142. That is, at least one of the second power supply portion 143 and the second element 144 is positioned so as to be capacitively coupled to at least one of the first power supply portion 141 and the first element 142. In the configuration example shown in FIG. 2 , a portion of the first element 142 is close to the plurality of heating wires 133 in a planar view, and the distance D (see FIG. 3 ) from the heating wire closest to the slot antenna 140 to the outer periphery of the glass plate 120 is, for example, 60 mm or less. Note that the first element 142 may be partially connected to the plurality of heating wires 133. That is, the first element 142 is capacitively coupled to the plurality of heating wires 133 via the light-shielding film 160 (see FIG. 3 ).

[0033] In the configuration example shown in Fig. 2, the first element 142 includes a strip portion 145 and a first linear portion 146. The strip portion 145 is a portion having a predetermined width that may be constant or variable. The first linear portion 146 is a linear portion having a width narrower than the strip portion 145. The first element 142 does not necessarily have to include the strip portion 145. For example, in the configuration example shown in Fig. 4, the slot antenna 240 includes a first element 142 that does not include the strip portion 145.

[0034] In the configuration example shown in FIG. 2 , the first element 142 forms a rectangular band-shaped portion 145 on the long side facing the multiple heating wires 133, i.e., the long side facing away from the outer edge of the second glass plate 122. The shape of the band-shaped portion 145 is not limited to this and may be, for example, semi-elliptical, triangular, or wavy. The band-shaped portion 145 may also have a perforated structure or a mesh structure. At least a portion of the band-shaped portion 145 may be connected to or adjacent to the multiple heating wires 133. In the configuration example shown in FIG. 2 , a portion of the band-shaped portion 145 is arranged to be connected to the multiple heating wires 133.

[0035] 2 , the first element 142 forms a linear first linear portion 146 on the long side of the outer edge of the second glass plate 122, i.e., the long side not on the side of the heating wires 133, and on two opposing short sides. That is, the first element 142 forms a loop shape with the band-shaped portion 145 and the first linear portion 146. The first power supply portion 141 is formed continuously with the band-shaped portion 145 and is disposed inside the loop shape of the first element 142.

[0036] As shown in Fig. 2, the second power supply portion 143 may be disposed near the first power supply portion 141 at a predetermined distance. The second element 144 may be formed by a linear second linear portion 147. The second linear portion 147 is a linear member extending from the second power supply portion 143. For example, as shown in Fig. 2, the second linear portion 147 may be a plurality of linear members extending from the second power supply portion 143 toward both short sides of the first element 142.

[0037] The shape pattern of the slot antenna 140 is not limited to the example shown in FIG. 2 . For example, the second linear portion 147 may have a half-loop element having a half-loop shape. The half-loop element is a component having a notch in a loop shape. The strip portion 145 may be formed on multiple sides. Specifically, the strip portion 145 may be formed on the long side closer to the heating wires 133 and on two short sides. The second linear portion 147 may be split into multiple parts midway. The first power supply portion 141 and the second power supply portion 143 may be disposed at the ends of the first element 142. The first power supply portion 141 may be spaced apart from the strip portion 145, i.e., may be continuous with the first linear portion 146. The second linear portion 147 may extend in multiple lengths or may be a single linear portion. The second linear portion 147 may be a plurality of extending linear members, only some of which form half-loop elements.

[0038] Fig. 3 shows an example configuration in which the glass plate 120 is a single glass plate. In Fig. 3, the upper side of the drawing is the exterior side of the vehicle, and the lower side is the interior side of the vehicle. The main surface of the glass plate 120 on the interior side of the vehicle, i.e., the main surface on which the slot antenna 140 is provided, is referred to as a first main surface 126. A light-shielding film 160 may be provided on the outer edge of the first main surface 126. The light-shielding film 160 is a light-shielding film that blocks at least a portion of sunlight, and is, for example, a black ceramic film.

[0039] As shown in FIG. 3 , a slot antenna 140 is provided on the first main surface 126 of the glass plate 120. The slot antenna 140 is a planar antenna on the first main surface 126 side of the glass plate 120, and is arranged near the outer edge of the glass plate 120. In the configuration example shown in FIG. 3 , the slot antenna 140 is provided on the surface of the light-shielding film 160 facing the interior of the vehicle. That is, at least a portion of the slot antenna 140 may be connected to or adjacent to the light-shielding film 160. One or more slot antennas 140 may be provided on the first main surface 126. As shown in FIG. 3 , the slot antenna 140 includes a first feeding portion 141, a first element 142, a second feeding portion 143, and a second element 144.

[0040] By configuring the vehicle window glass 100 in this manner, it is possible to provide a high-gain slot antenna 140 in a narrow location, such as an area on the outer edge side of the plurality of heating wires 133 on the first main surface 126. This makes it possible to widen the heating area in which the plurality of heating wires 133 are arranged on the glass plate 120. The slot antenna 140 may also be applied to a film antenna. A film antenna is a film-like antenna configured to be attached to the glass main surface.

[0041] Next, examples of the present invention will be described. As samples according to the examples, vehicle window glass samples were prepared by the following method.

[0042] <Glass Plate Configuration> The glass plate had a defogger formed on the first main surface.

[0043] <Antenna Configuration> The antenna was an antenna capable of receiving terrestrial digital television broadcast waves. The antenna was either linear or slot-shaped. The linear antenna was an antenna without a slot. The slot antenna was an antenna with the shape described with reference to Figure 2. The length of the long side of the slot antenna was 160 mm. The length of the short side of the slot antenna was 45 mm. The width of the strip portion was 25 mm.

[0044] <Example 1> The width from the outer edge of the defogger to the outer edge of the glass plate was set to 60 mm, and a linear antenna was arranged to obtain a sample of a vehicle window glass according to Example 1. The distance from the outer edge of the defogger to the outer edge of the antenna was 5 mm.

[0045] <Example 2> The width from the outer edge of the defogger to the outer edge of the glass plate was set to 80 mm, and a linear antenna was arranged to obtain a sample of a vehicle window glass according to Example 2. The distance from the outer edge of the defogger to the outer edge of the antenna was 25 mm.

[0046] <Example 3> The width from the outer edge of the defogger to the outer edge of the glass plate was set to 110 mm, and a linear antenna was arranged to obtain a sample of a vehicle window glass according to Example 3. The distance from the outer edge of the defogger to the outer edge of the antenna was 55 mm.

[0047] <Example 4> The width from the outer edge of the defogger to the outer edge of the glass plate was set to 140 mm, and a linear antenna was arranged to obtain a sample of a vehicle window glass according to Example 4. The distance from the outer edge of the defogger to the outer edge of the antenna was 85 mm.

[0048] <Example 5> The width from the outer edge of the defogger to the outer edge of the glass plate was set to 170 mm, and a linear antenna was arranged to obtain a sample of a vehicle window glass according to Example 5. The distance from the outer edge of the defogger to the outer edge of the antenna was 115 mm.

[0049] <Example 6> The width from the outer edge of the defogger to the outer edge of the glass plate was set to 200 mm, and a linear antenna was arranged to obtain a sample of a vehicle window glass according to Example 6. The distance from the outer edge of the defogger to the outer edge of the antenna was 145 mm.

[0050] Example 7 The width from the outer edge of the defogger to the outer edge of the glass plate was set to 230 mm, and a linear antenna was disposed to obtain a sample of a vehicle window glass according to Example 7. The distance from the outer edge of the defogger to the outer edge of the antenna was 175 mm.

[0051] Example 8 The width from the outer edge of the defogger to the outer edge of the glass plate was set to 260 mm, and a linear antenna was disposed to obtain a sample of a vehicle window glass according to Example 8. The distance from the outer edge of the defogger to the outer edge of the antenna was 205 mm.

[0052] Example 9 The width from the outer edge of the defogger to the outer edge of the glass plate was set to 60 mm, and a slot antenna was arranged to obtain a sample of vehicle window glass according to Example 9. The distance from the outer edge of the defogger to the outer edge of the antenna was 0 mm.

[0053] Example 10 The width from the outer edge of the defogger to the outer edge of the glass plate was set to 60 mm, and a slot antenna was arranged to obtain a sample of vehicle window glass according to Example 10. The distance from the outer edge of the defogger to the outer edge of the antenna was 5 mm.

[0054] <Measurement> To evaluate the samples prepared in this manner, the gain for radio waves of a predetermined frequency was measured. The measurement results are shown in Figure 5. The average gain calculated from the measurement results is also shown in Table 1. Examples 1 to 8 are comparative examples, and Examples 9 and 10 are working examples.

[0055]

[0056] As shown in Table 1, the average gain values ​​of Examples 9 and 10 were similar to that of Example 4 and were greater than those of Example 1, etc. This confirmed that a high-gain antenna can be realized in a narrow area by using a slot antenna.

[0057] The present invention has been described above in accordance with the above-mentioned embodiment, but the present invention is not limited to the configuration of the above-mentioned embodiment, and naturally includes various modifications, alterations, and combinations that a person skilled in the art can make within the scope of the invention as defined in the claims of this application.

[0058] This application claims priority based on Japanese Patent Application No. 2024-89420, filed May 31, 2024, the disclosure of which is incorporated herein in its entirety by reference.

[0059] REFERENCE SIGNS LIST 100 Vehicle window glass 120 Glass plate 126 First main surface 130 Defogger 131, 132 Bus bar 133 Multiple heating wires 140 Slot antenna 141 First power feed portion 142 First element 143 Second power feed portion 144 Second element 145 Strip portion 146 First linear portion 147 Second linear portion 150 Frame material 160 Light-shielding film 170 Adhesive member

Claims

1. A vehicle window glass attached to an opening formed by a conductive frame material provided on a vehicle body, the vehicle window glass comprising: a glass plate having a first main surface; a bus bar formed on the first main surface; a plurality of heating wires connected to the bus bar; and a slot antenna arranged on the first main surface, the slot antenna comprising: a first power feeder, a first element connected to the first power feeder, a second power feeder, and a second element connected to the second power feeder, and at least a portion of the first element is connected in close proximity to a portion of the plurality of heating wires.

2. A vehicle window glass according to claim 1, wherein the first power supply portion is a core wire side power supply portion, and the second power supply portion is a ground side power supply portion.

3. A vehicle window glass according to claim 1 or 2, wherein the first element has at least a strip-shaped portion, and a portion of the strip-shaped portion is connected to or adjacent to a portion of the plurality of heating wires.

4. A vehicle window glass according to claim 1 or 2, wherein the first element has a first linear portion that is linear in at least a portion thereof, and a portion of the first element is disposed in close proximity to the frame material.

5. A vehicle window glass according to claim 1 or 2, wherein the distance from the heating wire closest to the slot antenna among the plurality of heating wires to the outer periphery of the glass plate is 60 mm or less.

6. A vehicle window glass according to claim 1 or 2, wherein the first element has a loop shape, the second power supply portion and the second element are arranged inside the first element, and at least one of the second power supply portion and the second element is capacitively coupled to at least one of the first power supply portion and the first element.

7. A vehicle window glass as set forth in claim 4, wherein the first element has at least a strip-shaped portion, a portion of the strip-shaped portion being connected to or adjacent to the plurality of heating wires, and the first linear portion and the strip-shaped portion forming a loop shape.

8. A vehicle window glass according to claim 3, wherein the first power supply portion is formed continuously with the band-shaped portion and is disposed inside the loop.

9. A vehicle window glass according to claim 1 or 2, wherein the second power supply unit is arranged in the vicinity of the first power supply unit at a predetermined distance.

10. A vehicle window glass according to claim 1 or 2, wherein the bus bar is a pair of bus bars, each of which is arranged along two opposing sides of the glass plate.

Images