Vehicle window glass

Abstract

To provide window glass for vehicles with which it is possible to properly locate a defogger and an antenna to a glass pane and secure both defogging and anti-icing functions and antenna performance.SOLUTION: A window glass 1 for vehicles comprises a glass pane 10, an antenna 40, and a defogger 20. The defogger 20 includes a first busbar 21a and a second busbar 21b, a heater wire group 22, and a heater upper wire 30 that is located upward of the heater wire group 22, the heater upper wire 30 including a first end 31 that is connected to the first busbar 21a, a second end 32 that is connected to the second busbar 21b, a protrusion 33 that protrudes upward between the first 31 and the second end 32, and a bent part 34 that is located at a different position than the protrusion 33 and has a plurality of folding points. At least a portion of the antenna 40 is disposed in the inside region of the protrusion 33, and the protrusion 33 includes a defrosting part 35 that extends in the horizontal direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Vehicle rear windows are now equipped with a defogger to remove condensation (fogging) from the glass and an antenna to receive radio waves in a specific frequency band. Some vehicle models also have a wiper de-icer at the rear window where the wiper blades stop to prevent freezing. The wiper de-icer constitutes part of the defogger.

[0003] The following Patent Document 1 discloses a glass antenna in which an antenna for AM / FM broadcast waves and an antenna for TV broadcast waves are provided on the upper or side margin of a defogger made of a heated conductive wire on the rear window glass of an automobile, and a wiper de-icer powered by a defogger bus bar is provided below the defogger. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-159318 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent vehicle models, the standby position of the wipers is sometimes located at the top of the rear window rather than the bottom. Furthermore, in these vehicle models, electronic devices such as a rearview camera are often installed facing the top of the rear window. Given this background, there is a need to ensure sufficient space for the electronic devices within the limited area of ​​the rear window, as well as to appropriately position the defogger and antenna, and to achieve both anti-fogging and anti-icing functions and antenna performance.

[0006] The present invention has been made in view of the above circumstances, and provides a vehicle window glass in which a defogger and an antenna are appropriately arranged in a predetermined area of ​​the glass plate, thereby achieving both anti-fogging and anti-icing functions and antenna performance. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention has the following configuration. [1] A vehicle window glass attached to a window frame at the rear of a vehicle body, the vehicle window glass comprising: a glass plate; an antenna provided on the glass plate and capable of receiving radio waves in a predetermined frequency band; and an electrically heated defogger provided on the glass plate, wherein, when the vehicle window glass is attached to the window frame in a plan view, a direction parallel to a horizontal plane is defined as a horizontal direction, and a direction perpendicular to the horizontal direction is defined as a vertical direction, the defogger has a heater wire extending in the horizontal direction, the heater wire wire group is arranged in the vertical direction, an upper heater wire positioned above the heater wire group, and a first bus extending in the vertical direction at both ends of the glass plate in the horizontal direction, and supplying power to the heater wire group and the upper heater wire a first end connected to the first bus bar and a second end connected to the second bus bar, wherein the upper heater wire has a first end connected to the first bus bar and a second end connected to the second bus bar, a convex portion between the first end and the second end that protrudes upward on at least one side of the first bus bar and the second bus bar, and a bent portion between the first end and the second end that is located at a position different from the convex portion and has a plurality of bend points, at least a part of the antenna is located in an area inside the convex portion, a width of the convex portion in the vertical direction is wider than a distance between two of the heater wires that are adjacent in the vertical direction, and the convex portion includes a defrosting portion extending in the horizontal direction.

[0008] [2] The vehicle window glass according to [1], wherein when a virtual line is defined that passes through a portion of the heater upper wire that is closest to the heater wire group in the vertical direction at or near the bent portion and extends in the horizontal direction, at least a part of the antenna is disposed within a region surrounded by the virtual line and the convex portion.

[0009] [3] The vehicle window glass according to [1] or [2], wherein the bent portion has a half-loop shape.

[0010] [4] The vehicle window glass according to any one of [1] to [3], wherein the bent portion surrounds at least 60% of a predetermined area of ​​the glass plate.

[0011] [5] The vehicle window glass according to [4], wherein the predetermined region is triangular or trapezoidal in plan view of the glass plate.

[0012] [6] The vehicle window glass according to [5], wherein the bent portion has a portion that runs parallel to at least one of the upper and lower bases of the trapezoid.

[0013] [7] The vehicle window glass according to any one of [4] to [6], wherein the predetermined area includes an optical area of ​​an electronic device facing the glass plate.

[0014] [8] The vehicle window glass according to any one of [1] to [7], wherein the heater upper wire is a single wire.

[0015] [9] The vehicle window glass according to any one of [1] to [8], wherein the bent portion is disposed in a central region of the defogger in the horizontal direction.

[0016]

[10] The vehicle window glass according to any one of [1] to [9], wherein the antenna has a horizontal length longer than a vertical length.

[0017]

[11] The vehicle window glass according to any one of [1] to

[10] , wherein the distance between the upper end of the antenna and the heater wire group in the vertical direction is 50 mm or more.

[0018]

[12] The vehicle window glass according to any one of [1] to

[11] , wherein the distance between the lower end of the antenna and the heater wire group in the vertical direction is 5 mm or more.

[0019]

[13] The vehicle window glass according to any one of [1] to

[12] , wherein the defogger has a short-circuiting wire that short-circuits at least two of the heater wires in the vertical direction.

[0020]

[14] The vehicle window glass according to any one of [1] to

[13] , wherein the antenna receives radio waves in at least one of the VHF band and the UHF band.

[0021]

[15] The vehicle window glass according to any one of [1] to

[14] , wherein the convex portion has a first convex portion that protrudes upward on the first bus bar side and a second convex portion that protrudes upward on the second bus bar side, and the antenna has a first antenna that is arranged in an area inside the first convex portion and a second antenna that is arranged in an area inside the second convex portion.

[0022]

[16] The vehicle window glass according to

[15] , wherein the first antenna and the second antenna are capable of receiving radio waves in the same frequency band.

[0023]

[17] The vehicle window glass according to

[16] , wherein the first antenna and the second antenna receive radio waves in the frequency band of Band III of the DAB standard or radio waves in the frequency band of terrestrial digital broadcast waves.

[0024]

[18] The vehicle window glass according to any one of

[15] to

[17] , wherein the antenna has a third antenna arranged in a region below the defogger.

[0025]

[19] The vehicle window glass according to

[18] , wherein the third antenna is capacitively coupled to an auxiliary element extending from a lower end of the defogger.

[0026]

[20] The vehicle window glass according to

[18] or

[19] , wherein the third antenna receives radio waves in the FM frequency band. [Effects of the Invention]

[0027] According to the present invention, the defogger and antenna are appropriately arranged on the glass sheet, and it is possible to achieve both anti-fogging and anti-icing functions and antenna performance. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a plan view of a vehicle window glass according to a first embodiment of the present invention. [Figure 2] FIG. 4 is a plan view of a vehicle window glass according to a second embodiment of the present invention. [Figure 3] 4 is a graph showing antenna characteristics of the vehicle window glass according to the first embodiment of the present invention. [Figure 4] 6 is a graph showing antenna characteristics of a vehicle window glass according to a second embodiment of the present invention. [Figure 5] FIG. 1 is a plan view of a test glazing of the present invention. [Figure 6] FIG. 1 is a plan view of a test window glass of the present invention on which an antenna is mounted. [Figure 7] 7 is a graph showing antenna characteristics on the rear left side of a vehicle of the test window glass shown in FIG. 6. [Figure 8] 7 is a graph showing antenna characteristics on the right rear side of a vehicle of the test window glass shown in FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, vehicle window glass according to embodiments of the present invention will be described with reference to the drawings. Note that for ease of understanding, the scale of each part in the drawings may differ from the actual scale. Directions such as parallel, right angle, orthogonal, horizontal, vertical, up / down, left / right, etc. are allowed to have deviations to the extent that they do not impair the effects of the embodiments. The shape of the corners is not limited to right angles, and may be rounded in an arched shape. Parallel, right angle, orthogonal, horizontal, and vertical may include approximately parallel, approximately right angle, approximately orthogonal, approximately horizontal, and approximately vertical.

[0030] "Approximately parallel" and "approximately horizontal" may mean, for example, that the angle with respect to a reference line (parallel line, horizontal line) is ±15° or less, or may be in the range of ±10°, ±5°, or ±3°. When the angle with respect to the reference line (parallel line, horizontal line) approaches 0°, the design of the antenna, for example, is improved. "Approximately right angles," "approximately orthogonal," and "approximately perpendicular" may mean, for example, an angle of ±15° or less relative to 90° between two reference lines or reference planes, or may be within a range of ±10°, ±5°, or ±3°. When the angle relative to the angle between two reference lines or reference planes approaches 90°, the design of the antenna, for example, is improved.

[0031] In the following description, when the vehicle window glass is viewed in plan while attached to a window frame, the direction parallel to the horizontal plane is defined as the horizontal direction, and the direction perpendicular to the horizontal direction is defined as the vertical direction. In the XY coordinate system set in the figure, the X axis direction is the horizontal direction, and the Y axis direction is the vertical direction. Furthermore, the symbol "~" indicating a range of values ​​means that the values ​​before and after it are included as the lower and upper limits.

[0032] An example of application of the vehicle window glass in this embodiment is a rear window attached to the rear of a vehicle, but the vehicle window glass in this embodiment is not limited to a rear window.

[0033] [First embodiment] FIG. 1 is a plan view of a vehicle window glass 1 according to a first embodiment of the present invention. The vehicle window glass 1 shown in Fig. 1 is used as a rear window attached to the rear of a vehicle. Fig. 1 also shows the vehicle window glass 1 attached to a window frame (not shown) from the perspective of the vehicle interior. Outside the opening shown by the dotted line in Fig. 1, the peripheral edge of the main surface of the glass plate 10 and a window frame (not shown) that is a flange that serves as a metal part are attached with an adhesive such as urethane resin.

[0034] 1 , a vehicle window glass 1 of this embodiment includes a glass plate 10, a defogger 20, and an antenna 40. The glass plate 10 has a substantially rectangular outer shape in a plan view. When the glass plate 10 is attached to a window frame 2, the outer edges of the glass plate 10 include an upper edge 11 and a lower edge 12 that face each other in the vertical direction, and a left edge 13 and a right edge 14 that face each other in the horizontal direction.

[0035] The upper edge 11 may be formed with a recess 11a recessed downward in the vertical direction. In this case, for example, a motor unit that drives (swings) a wiper arranged in a defrosting unit 35 described later is arranged in the recess 11a. The recess 11a is arranged in a central region in the horizontal direction of the glass plate 10. When the position of the left edge 13 of the glass plate 10 is taken as 0% and the position of the right edge 14 of the glass plate 10 is taken as 100%, the central region in the horizontal direction of the glass plate 10 may include, for example, a range of 25% to 75%, a range of 30% to 70%, or a range of 35% to 65%.

[0036] A light-shielding region 10B of a predetermined width that blocks visible light may be provided at the outer peripheral edge of the glass plate 10. The light-shielding region 10B of the glass plate 10 is formed, for example, by a black ceramic film as a light-shielding film formed on the outer peripheral edge of the glass plate 10. The region inside an inner edge 10C of the light-shielding region 10B is a transmissive region 10A that transmits visible light. In FIG. 1, a double line drawn along the inside of a first bus bar 21a and a second bus bar 21b (described later) corresponds to the boundary between the transmissive region 10A and the light-shielding region 10B.

[0037] The defogger 20 is a conductive pattern provided on the glass plate 10. The defogger 20 shown in FIG. 1 is an electrically heated defogger and includes a first bus bar 21a and a second bus bar 21b, a heater wire group 22, and an upper heater wire 30. The first bus bar 21a and the second bus bar 21b are arranged on both horizontal ends of the glass plate 10 (for example, within the light-shielding region 10B). The first bus bar 21a extends vertically along the left edge 13 of the glass plate 10, and the second bus bar 21b extends vertically along the right edge 14 of the glass plate 10.

[0038] The heater wire group 22 has a plurality of heater wires 23 arranged between the first bus bar 21a and the second bus bar 21b. The plurality of heater wires 23 extend in the horizontal direction so as to run parallel to one another and are arranged side by side at predetermined intervals in the vertical direction. One end of each of the plurality of heater wires 23 is connected to the first bus bar 21a, and the other end of each of the plurality of heater wires 23 is connected to the second bus bar 21b.

[0039] When a voltage (DC voltage) is applied to the heater wire group 22 via the first bus bar 21a and the second bus bar 21b, a DC current flows through the heater wire group 22, thereby heating the glass sheet 10. Heating the glass sheet 10 removes condensation (fogging) on ​​the glass sheet 10. The number of heater wires 23 included in the heater wire group 22 may be more or less than the number shown in the figure, as long as the effect of removing condensation (fogging) on ​​the glass sheet 10 is obtained while ensuring visibility outside the vehicle through the glass sheet 10.

[0040] The defogger 20 may have a short-circuiting line 24 that vertically short-circuits at least two heater wires 23 included in the heater wire group 22. The short-circuiting line 24 of this embodiment vertically short-circuits all of the heater wires 23 included in the heater wire group 22, for example, from the heater wire 23a located at the uppermost position (topmost edge) of the heater wire group 22 to the heater wire 23b located at the lowermost position (bottommost edge) of the heater wire group 22. However, the short-circuiting line 24 is not limited to a line that vertically short-circuits all of the heater wire group 22, and may be a line that vertically short-circuits some of the heater wire group 22.

[0041] The defogger 20 has three short-circuiting wires 24: short-circuiting wire 24c located at the horizontal center of the defogger 20; short-circuiting wire 24a located closer to the first bus bar 21a than short-circuiting wire 24c; and short-circuiting wire 24b located closer to the second bus bar 21b than short-circuiting wire 24c. In this embodiment, the horizontal distance between short-circuiting wire 24a and short-circuiting wire 24c is equal to the horizontal distance between short-circuiting wire 24b and short-circuiting wire 24c, but these do not have to be equal. When the horizontal distance between short-circuiting wire 24a and short-circuiting wire 24c is equal to the horizontal distance between short-circuiting wire 24b and short-circuiting wire 24c, the design of the defogger 20 is improved. The number of short-circuiting wires 24 is not limited to three, and may be one, two, four or more.

[0042] In the heater wire 23, the horizontal length between the first bus bar 21a and the short-circuiting line 24a, the horizontal length between the short-circuiting line 24a and the short-circuiting line 24c, the horizontal length between the short-circuiting line 24c and the short-circuiting line 24b, and the horizontal length between the short-circuiting line 24b and the second bus bar 21b are preferably set to lengths that do not generate standing waves in a predetermined frequency band received by the antenna 40. In other words, when the wavelength in air of the predetermined frequency band is an arbitrary wavelength λ between λ1 and λ2, the wavelength shortening rate of the glass plate 10 is k, and N is an integer equal to or greater than 1, the horizontal length between the first bus bar 21a and the short-circuiting line 24a, the horizontal length between the short-circuiting line 24a and the short-circuiting line 24c, the horizontal length between the short-circuiting line 24c and the short-circuiting line 24b, and the horizontal length between the short-circuiting line 24b and the second bus bar 21b should be set so as not to be N×k×λ / 2.

[0043] The upper heater wire 30 is located above the heater wire group 22, i.e., on the upper edge 11 side. The upper heater wire 30 has a first end 31 connected to the first bus bar 21a, a second end 32 connected to the second bus bar 21b, a convex portion 33 that protrudes upward on at least one side of the first bus bar 21a and the second bus bar 21b between the first end 31 and the second end 32, and a bent portion 34 that is located at a position different from the convex portion 33 and has multiple bend points between the first end 31 and the second end 32.

[0044] The first end 31 is located at the vertical upper end of the first bus bar 21a, but may be located elsewhere. The second end 32 is located at the vertical upper end of the second bus bar 21b, but may be located elsewhere. The upper heater wire 30 is a linear conductor pattern that continues from the first end 31, which is connected to the first bus bar 21a, to the second end 32, which is connected to the second bus bar 21b, without being connected to other conductors (such as the heater wire 23 and the short-circuit wire 24). The upper heater wire 30 can also be considered a heater wire isolated from the heater wire group 22.

[0045] Convex portion 33 has a first convex portion 33A that protrudes upward (toward upper edge 11) on the first bus bar 21a side, and a second convex portion 33B that protrudes upward (toward upper edge 11) on the second bus bar 21b side. Note that convex portion 33 may have at least one of first convex portion 33A and second convex portion 33B. First convex portion 33A has a convex shape that extends upward from the upper end of first bus bar 21a, then bends toward second bus bar 21b, and extends in a direction substantially parallel to the horizontal direction.

[0046] The vertical width of the first convex portion 33A is preferably wider than the spacing between two vertically adjacent heater wires 23 in the heater wire group 22. The vertical width of the first convex portion 33A refers to the width from the uppermost heater wire 23a (closer to the upper edge 11) in the heater wire group 22 to an upper side portion of the first convex portion 33A extending in a direction substantially parallel to the horizontal direction. Note that if the spacing between two vertically adjacent heater wires 23 in the heater wire group 22 is not constant, the vertical width of the first convex portion 33A should be wider than the average spacing between two vertically adjacent heater wires 23 in the heater wire group 22, and is preferably wider than the maximum spacing.

[0047] The second convex portion 33B has a convex shape including an upper edge portion that extends upward from the upper end of the second bus bar 21b, then bends toward the first bus bar 21a, and extends in a direction substantially parallel to the horizontal direction. A defrosting portion 35 is formed on the upper edge portion of the second convex portion 33B that extends in a direction substantially parallel to the horizontal direction. The defrosting portion 35 is provided in an area where a wiper (not shown) that moves on the outer surface of the glass plate 10 waits, and functions as a wiper de-icer that melts ice and snow that has adhered to the wiper waiting in that area.

[0048] In the example shown in FIG. 1, the defrosting portion 35 is formed in a meander shape. The reason for forming the defrosting portion 35 in a meander shape is to expand the area in which the upper heater wire 30 heats the glass sheet 10. By forming the defrosting portion 35 in a meander shape, the area in which the upper heater wire 30 heats the glass sheet 10 can be made into a substantially planar (two-dimensional) area that extends horizontally and vertically. This expands the area in which the defrosting portion 35 heats the glass sheet 10, allowing ice and snow adhering to the wiper to efficiently melt. In the example shown in FIG. 1, the upper heater wire 30 is formed of a single heater wire without any branches, serving as a single heater wire.

[0049] The defrosting section 35 is not limited to a meander shape with an arc-shaped folded portion, but may also have a block-shaped meander shape with a bent folded portion, as long as the effect of expanding the area in which the heater upper wire 30 heats the glass sheet 10 is obtained. The heater upper wire 30 may also have a linear shape extending in a direction substantially parallel to the horizontal direction. The heater upper wire 30 is not limited to being formed as a single wire (single heater wire), but may be formed such that a portion of the heater upper wire 30 branches into two or more lines extending in a direction substantially parallel to the horizontal direction to include the defrosting section 35. When the defrosting section 35 is formed by branching a single wire of the heater upper wire 30 into multiple lines extending in a substantially horizontal direction, the width of the single wire of the heater upper wire 30 is preferably greater than the width of each of the branched lines constituting the defrosting section 35. Furthermore, in this case, both ends of the defrosting section 35 (including the branched portions) are connected to the single wire of the heater upper wire 30. As described above, the defrosting portion 35 only needs to be provided on the convex portion 33, and may be formed by the heater upper wire 30 itself, by a branch of the heater upper wire 30, or by something other than the heater upper wire 30. Such a defrosting portion 35 is not limited to being provided to provide the wiper de-icer function. For example, the defrosting portion 35 may be located at a position away from the standby position of the wipers, or may be located as part of the defogger 20 of a vehicle without wipers.

[0050] The vertical width of the second convex portion 33B is wider than the spacing between two vertically adjacent heater wires 23 in the heater wire group 22. The vertical width of the second convex portion 33B refers to the width from the heater wire 23a located at the uppermost position (closer to the upper edge 11) of the heater wire group 22 to the upper edge portion of the second convex portion 33B extending in a direction substantially parallel to the horizontal direction (the folded-back portion at the lower end of the meander-shaped defrosting portion 35). Note that if the spacing between two vertically adjacent heater wires 23 in the heater wire group 22 is not constant, the vertical width of the second convex portion 33B should be wider than the average spacing between two vertically adjacent heater wires 23 in the heater wire group 22, and is preferably wider than the maximum spacing.

[0051] When the defogger 20 has both the first convex portion 33A and the second convex portion 33B, the bent portion 34 is formed between them. When the defogger 20 has either the first convex portion 33A or the second convex portion 33B, the bent portion 34 is also disposed in the central region in the horizontal direction of the defogger 20. When the position of the left edge of the first bus bar 21a is defined as 0% and the position of the right edge of the second bus bar 21b is defined as 100%, the central region in the horizontal direction of the defogger 20 may be, for example, between 25% and 75%, between 30% and 70%, or between 35% and 65%.

[0052] The bent portion 34 corresponds to a portion of the heater upper wire 30 having a half-loop shape that surrounds a predetermined region 50 of the glass plate 10. Here, the half-loop shape refers to a conductor pattern that is composed of linear elements and is not a closed loop, but has a notch to form a loop (half-loop shape). Specifically, the "half-loop shape" refers to a conductor pattern that includes at least a "U-shape," a "C-shape," a "J-shape," an "L-shape," a "Π-shape," or an "Ω-shape" when viewed from above the glass plate 10.

[0053] The bent portion 34 preferably surrounds 60% or more of the predetermined region 50 of the glass plate 10. This 60% is a coverage rate when a state in which the bent portion 34 surrounds the entire periphery of the predetermined region 50 (in a closed loop shape) is taken as 100%. For example, if the predetermined region 50 of the glass plate 10 is an equilateral triangle and the bent portion 34 is a half-loop shape with one side of the equilateral triangle missing, the coverage rate is approximately 66%. In this case, it can be said that the bent portion 34 surrounds 60% or more of the predetermined region 50 of the glass plate 10. Furthermore, in order to efficiently heat the predetermined region 50, the bent portion 34 preferably surrounds 70% or more of the predetermined region of the glass plate 10, more preferably 80% or more, and even more preferably 90% or more.

[0054] The predetermined area 50 is the transmission area 10A of the glass plate 10 and includes an optical area of ​​an electronic device installed on the interior side of the glass plate 10 and facing the glass plate 10. The electronic device is a camera for taking pictures outside the vehicle, and the optical area is the angle of view of the camera for taking pictures outside the vehicle. The camera for taking pictures outside the vehicle faces diagonally downward and rearward toward the road surface behind the vehicle. Therefore, the predetermined area 50 is formed in a triangular or trapezoidal shape when viewed from above the glass plate 10. Electronic devices other than the camera for taking pictures outside the vehicle may also be disposed in the predetermined area 50. Examples of such electronic devices include a laser measuring device that measures the distance to a vehicle behind, and laser fog lights that prevent rear-end collisions with vehicles behind.

[0055] In the example shown in FIG. 1 , the bent portion 34 has a trapezoidal half-loop shape without a bottom base. Specifically, the bent portion 34 has a first leg 34a, an upper base 34b, and a second leg 34c. The first leg 34a bends toward the upper edge 11 of the glass plate 10 relative to a first horizontal portion 36 that bends at a right angle from the first convex portion 33A and extends horizontally toward the right edge 14 of the glass plate 10. The angle formed between the first horizontal portion 36 and the first leg 34a is an obtuse angle. The bent portion 34 has a first bending point between the first horizontal portion 36 and the first leg 34a. In other words, the first bending point is the connection point between the first horizontal portion 36 and the first leg 34a.

[0056] The upper base portion 34b bends toward the right edge 14 of the glass plate 10 relative to the first leg portion 34a, which extends toward the upper edge 11 of the glass plate 10. The angle formed between the first leg portion 34a and the upper base portion 34b is an obtuse angle. The upper base portion 34b extends horizontally. The bent portion 34 has a second bending point between the first leg portion 34a and the upper base portion 34b. In other words, the second bending point is the connection point between the first leg portion 34a and the upper base portion 34b.

[0057] The second leg 34c bends toward the lower edge 12 of the glass plate 10 relative to the upper base 34b, which extends horizontally. The angle between the upper base 34b and the second leg 34c is an obtuse angle, the same as the angle between the first leg 34a and the upper base 34b. The bent portion 34 has a third bending point between the upper base 34b and the second leg 34c. In other words, the third bending point is the connection point between the upper base 34b and the second leg 34c.

[0058] The second horizontal portion 37, which bends at a right angle from the second convex portion 33B and extends horizontally toward the left edge 13 of the glass plate 10, is connected to the lower end of the second leg portion 34c. The angle formed between the second leg portion 34c and the second horizontal portion 37 is an obtuse angle, and is the same as the angle formed between the first horizontal portion 36 and the first leg portion 34a. The bent portion 34 has a fourth bending point between the second leg portion 34c and the second horizontal portion 37. In other words, the fourth bending point is the connection point between the second leg portion 34c and the second horizontal portion 37.

[0059] As described above, the bent portion 34 is formed between the first horizontal portion 36 and the second horizontal portion 37, which connect the first convex portion 33A and the second convex portion 33B, and has an isosceles trapezoidal shape with first to fourth bending points. The first horizontal portion 36 and the second horizontal portion 37 are aligned in the vertical direction, but may be aligned in different directions. In this embodiment, the bent portion 34 is positioned closer to the second bus bar 21b (second convex portion 33B) than the short-circuit line 24c (a virtual vertical line horizontally dividing the glass plate 10). The second convex portion 33B has a canopy portion 35a in which the defrosting portion 35 extends above the bent portion 34. In other words, the bent portion 34 is positioned so as to overlap a portion of the defrosting portion 35 in the vertical direction.

[0060] The antenna 40 is configured to be able to receive radio waves in a predetermined frequency band. The antenna 40 may be configured to be able to receive radio waves in one frequency band, or may be configured to be able to receive radio waves in two or more different frequency bands. When the antenna 40 is configured to be able to receive radio waves in one frequency band, the antenna 40 is configured with at least one of a first antenna 40A and a second antenna 40B (described later) and does not include a third antenna 40C (described later). When the antenna 40 is configured to be able to receive radio waves in two or more different frequency bands, the antenna 40 includes at least one of a first antenna 40A and a second antenna 40B (described later) and a third antenna 40C (described later). The two different frequency bands may be a combination in which the frequency bands partially overlap, or may not overlap at all. Hereinafter, unless otherwise specified, the antenna 40 is assumed to be configured to be able to receive radio waves in two different frequency bands as radio waves in the predetermined frequency band. The antenna 40 will be described as resonating at frequencies in the two different frequency bands, respectively, and the same applies to each antenna in the second embodiment and subsequent embodiments in this specification. For example, the antenna 40 receives at least one of radio waves in the VHF band (30 MHz to 300 MHz) and radio waves in the UHF band (300 MHz to 3 GHz).

[0061] The antenna 40 of this embodiment includes a first antenna 40A, a second antenna 40B, and a third antenna 40C. The first antenna 40A and the second antenna 40B are capable of receiving radio waves in the same frequency band, and may receive, for example, VHF radio waves, such as Band III (174 MHz to 240 MHz) of the DAB standard, or UHF radio waves, such as terrestrial digital television broadcast waves (470 MHz to 710 MHz). The third antenna 40C may receive VHF radio waves, such as FM broadcast waves (76 MHz to 108 MHz). The antenna 40 may also receive MF radio waves, such as AM broadcast waves (522 kHz to 1710 kHz), in the MF band.

[0062] The first antenna 40A is disposed inside the first convex portion 33A. Specifically, when an imaginary straight line L is defined as extending horizontally through the portion (first horizontal portion 36 and second horizontal portion 37) of the heater upper wire 30 that is closest to the heater wire group 22 in the vertical direction near the bend portion 34, the first antenna 40A is disposed within a region surrounded by the imaginary straight line L and the first convex portion 33A. Note that when the vertical positions of the first horizontal portion 36 and the second horizontal portion 37 are the same but the vertical positions of the first horizontal portion 36 and the second horizontal portion 37 are different, the imaginary straight line L is defined as a line extending horizontally that passes through the horizontal portion of the first horizontal portion 36 or the second horizontal portion 37 that is closest to the heater wire group 22 in the vertical direction.

[0063] The first antenna 40A is, for example, a dipole antenna and includes a power feeder 41, a power feeder-side element 42, a grounding portion 43, and a grounding-side element 44. The power feeder 41 is a rectangular conductor pattern and is electrically connected to one end of a power feed line (not shown). The power feeder 41 may be shaped like a circle or another polygon. The power feeder-side element 42 is a conductor pattern including a horizontal element extending from the power feeder 41 toward the center of the glass sheet 10 in the horizontal direction, and T-shaped elements extending downward from the power feeder 41 and then extending to both sides in the horizontal direction. The power feeder-side element 42 is not limited to a horizontal element or a T-shaped element, and can be formed in any pattern.

[0064] The earth portion 43 is a rectangular conductor pattern formed near the power supply portion 41 and is electrically connected to one end of a ground line (not shown). The shape of the earth portion 43 may be circular, another polygon, or other shapes. The earth portion side element 44 is a conductor pattern including a horizontal element extending from the earth portion 43 toward the left edge 13 of the glass plate 10. The earth portion side element 44 is not limited to a horizontal element and can be formed in any pattern. The first antenna 40A and the second antenna 40B (described later) are not limited to dipole antennas and may be monopole antennas. In this case, the power supply portion 41 and the power supply portion side element 42 form the first antenna 40A and the second antenna 40B.

[0065] The horizontal length of the first antenna 40A is longer than its vertical length. That is, the region in which the first antenna 40A is disposed, enclosed by the imaginary line L and the first convex portion 33A, also has a horizontal length longer than its vertical length. The vertical distance h1 between the upper end of the first antenna 40A and the heater wire group 22 may be 50 mm or more. In this embodiment, the upper end of the first antenna 40A is the upper end of the power feed portion 41. However, if the power feed portion side element 42 extends above the power feed portion 41, the upper end of the power feed portion side element 42 is the upper end of the first antenna 40A.

[0066] The horizontal width W1 of the region surrounded by the imaginary line L and the first convex portion 33A is, for example, 360 mm. The vertical distance h1 between the upper end of the first antenna 40A and the heater wire group 22 is, for example, 77.0 mm. The vertical distance h3 between the lower end of the first antenna 40A and the heater wire group 22 may be 5 mm or more, preferably 15 mm or more, and more preferably 25 mm or more. In this embodiment, the lower end of the first antenna 40A is the lower end of the power feeder element 42. However, if the power feeder 41 is located below the power feeder element 42, the lower end of the power feeder 41 is the lower end of the first antenna 40A.

[0067] The second antenna 40B is, for example, a dipole antenna, and similar to the first antenna 40A, has a power feed portion 41, a power feed portion-side element 42, a ground portion 43, and a ground portion-side element 44. The second antenna 40B is formed substantially symmetrically with the first antenna 40A, and receives radio waves in a predetermined frequency band while complementing each other. The power feed portion 41 is a rectangular conductor pattern and is electrically connected to one end of a power feed line (not shown). The specific patterns of the power feed portion 41, the power feed portion-side element 42, the ground portion 43, and the ground portion-side element 44 constituting the second antenna 40B may be similar to those of the first antenna 40A.

[0068] The horizontal length of the second antenna 40B is longer than its vertical length. That is, the region in which the second antenna 40B is disposed, surrounded by the imaginary line L and the second convex portion 33B, also has a horizontal length longer than its vertical length. The vertical distance h2 between the upper end of the second antenna 40B and the heater wire group 22 may be 50 mm or more. In this embodiment, the upper end of the second antenna 40B is the upper end of the power feed portion 41. However, if the power feed portion side element 42 extends above the power feed portion 41, the upper end of the power feed portion side element 42 is the upper end of the second antenna 40B.

[0069] The horizontal width W2 of the region surrounded by the imaginary line L and the second convex portion 33B is, for example, 360 mm. The vertical distance h2 between the upper end of the second antenna 40B and the heater wire group 22 is, for example, 77.0 mm. The vertical distance h4 between the lower end of the second antenna 40B and the heater wire group 22 may be 5 mm or more, preferably 15 mm or more, and more preferably 25 mm or more. In this embodiment, the lower end of the second antenna 40B is the lower end of the power feeder element 42. However, if the power feeder 41 is located below the power feeder element 42, the lower end of the power feeder 41 is the lower end of the second antenna 40B.

[0070] The antenna 40 of this embodiment may have either the first antenna 40A or the second antenna 40B and the third antenna 40C. In this case, the first antenna 40A is disposed in the region inside the first convex portion 33A, or the second antenna 40B is disposed in the region inside the second convex portion 33B. Furthermore, when the antenna 40 of this embodiment has both the first antenna 40A and the second antenna 40B, the first convex portion 33A is not required due to the heater upper wire 30, and the first antenna 40A may be disposed closer to the upper edge 11 than the heater upper wire 30, that is, disposed outside the defogger 20. In this case, the second antenna 40B is disposed in the region inside the second convex portion 33B.

[0071] The third antenna 40C is disposed in a region below the defogger 20. The third antenna 40C is, for example, a monopole antenna and includes a power supply portion 45 and an antenna element 46. The power supply portion 45 is a rectangular conductor pattern and is electrically connected to one end of a power supply line (not shown). The shape of the power supply portion 45 may be other shapes, such as a circle or another polygon. The power supply portion 45 is disposed near the lower end of the first bus bar 21a, but may also be disposed near the lower end of the second bus bar 21b.

[0072] The antenna element 46 is a conductor pattern including an L-shaped element that extends upward from the power supply portion 45, then bends, and extends toward the center position of the glass sheet 10 in the horizontal direction. The antenna element 46 is not limited to an L-shaped element and can be formed in any pattern. The defogger 20 may have an auxiliary element 25 extending from the lower end, and the antenna element 46 may be capacitively coupled to the auxiliary element 25. In this embodiment, the auxiliary element 25 is a conductor pattern including an L-shaped element that extends downward from the junction between the short-circuit wire 24c and the heater wire 23b and then extends toward the left edge 13 of the glass sheet 10. The auxiliary element 25 can be arranged in any position, and when the auxiliary element 25 is included, its shape is not limited to an L-shape and can be formed in any pattern.

[0073] 1, antenna element 46 is capacitively coupled with at least the horizontal portion of auxiliary element 25. Furthermore, the horizontal portion of antenna element 46 is inserted between heater wire 23b and auxiliary element 26 in the vertical direction, and can also be capacitively coupled with heater wire 23b. When capacitively coupled, the spacing between antenna element 46, auxiliary element 26, and heater wire 23b may be 30 mm or less, and there is no particular lower limit to this spacing, but it may be, for example, 1 mm or more, 3 mm or more, or 5 mm or more.

[0074] As described above, the vehicle window glass 1 of the first embodiment is a vehicle window glass 1 that is attached to a window frame at the rear of a vehicle body, and includes a glass plate 10, an antenna 40 that is provided on the glass plate 10 and that is capable of receiving radio waves in a predetermined frequency band, and an electrically heated defogger 20 that is provided on the glass plate 10. When the vehicle window glass 1 is attached to the window frame and viewed in plan, if a direction parallel to a horizontal plane is defined as the horizontal direction and a direction perpendicular to the horizontal direction is defined as the vertical direction, the defogger 20 includes a heater wire 23 that extends horizontally, a heater wire group 22 that is arranged vertically, upper heater wires 30 that are positioned above the heater wire group 22, and a third heater wire 30 that extends vertically at both ends of the glass plate 10 in the horizontal direction and supplies power to the heater wire group 22 and the upper heater wire 30. The heater wire group 22 has a first bus bar 21a and a second bus bar 21b, and the heater upper wire 30 has a first end 31 connected to the first bus bar 21a, a second end 32 connected to the second bus bar 21b, a convex portion 33 between the first end 31 and the second end 32 that protrudes upward on at least one side of the first bus bar 21a and the second bus bar 21b, and a bent portion 34 between the first end 31 and the second end 32 that is located at a position different from the convex portion 33 and has a plurality of bend points, at least a part of the antenna 40 is located in an area inside the convex portion 33, the vertical width of the convex portion 33 is wider than the average spacing between two vertically adjacent heater wires 23 of the heater wire group 22, and the convex portion 33 is provided with a defrosting portion 35 extending horizontally. According to this configuration, the defogger 20 and the antenna 40 are appropriately arranged in a predetermined area of ​​the glass plate 10, and it is possible to achieve both anti-fogging and anti-icing functions and antenna performance.

[0075] Specifically, in the first embodiment, when an imaginary straight line L is defined that extends horizontally and passes through the portion of the upper heater wire 30 that is closest in the vertical direction to the heater wire group 22 (first horizontal portion 36 and second horizontal portion 37) near the bent portion 34, at least a portion of the antenna 40 is disposed within an area surrounded by the imaginary straight line L and the convex portion 33. With this configuration, the antenna 40 can be appropriately disposed within a limited area (inside the convex portion 33) of the glass plate 10. Furthermore, it is preferable that the horizontal length of the antenna 40 disposed within the area surrounded by the imaginary straight line L and the convex portion 33 is longer than the vertical length.

[0076] In the first embodiment, the bent portion 34 has a half-loop shape. With this configuration, the predetermined region 50 of the glass plate 10 can be heated in a single stroke. The bent portion 34 may be formed in a meandering shape as long as the anti-fogging function of the predetermined region 50 is ensured. In the first embodiment, the bent portion 34 surrounds 60% or more of the predetermined region 50 of the glass plate 10. With this configuration, the predetermined region 50 of the glass plate 10 can be sufficiently heated.

[0077] Moreover, in the first embodiment, the predetermined region 50 includes the optical region of the electronic device facing the glass plate 10. With this configuration, the anti-fogging function of the bent portion 34 can suppress deterioration in the optical performance of the electronic device. An example of the electronic device is a camera for taking pictures outside the vehicle. The bent portion 34 is disposed in the horizontal central region of the defogger 20. With this configuration, an anti-fogging function can be added to the horizontal central region of the defogger 20, where the camera for taking pictures outside the vehicle is easily disposed. Furthermore, the predetermined region 50 can be shaped, for example, as a triangle or a trapezoid when viewed from above the glass plate 10. Furthermore, the bent portion 34 has a portion (upper base portion 34b) that runs parallel to the upper base of the trapezoidal shape of the predetermined region 50. With this configuration, the angle of view of the camera for taking pictures outside the vehicle can be efficiently heated.

[0078] In the first embodiment, the antenna 40 receives radio waves in at least one of the VHF and UHF bands. The defogger 20 also has a short-circuiting wire 24 that short-circuits at least two of the heater wires 23 in the vertical direction. This configuration allows the heater wires 23 of the defogger 20 to be set to a length that does not generate standing waves in at least one of the VHF and UHF bands received by the antenna 40.

[0079] In the first embodiment, when the glass plate 10 is attached to a vehicle, the convex portion 33 has a first convex portion 33A that protrudes upward on the first bus bar 21a side and a second convex portion 33B that protrudes upward on the second bus bar 21b side, and the antenna 40 has a first antenna 40A that is disposed in an area inside the first convex portion 33A and a second antenna 40B that is disposed in an area inside the second convex portion 33B. The first antenna 40A and the second antenna 40B are capable of receiving radio waves in the same frequency band, and receive radio waves in the frequency band of Band III of the DAB standard or radio waves in the frequency band of terrestrial digital broadcast waves.

[0080] In the first embodiment, the vertical distances h1, h2 between the upper ends of the first antenna 40A and the second antenna 40B and the heater wire group 22 are 50 mm or more. The vertical distances h3, h4 between the lower ends of the first antenna 40A and the second antenna 40B and the heater wire group 22 are 5 mm or more. This configuration reduces the influence of the heater wire group 22 on the first antenna 40A and the second antenna 40B, improving antenna performance.

[0081] Furthermore, in the first embodiment, the antenna 40 may have a third antenna 40C disposed in a region below the defogger 20. The third antenna 40C may have an auxiliary element 25 extending from the lower end of the defogger 20 and be capacitively coupled to the auxiliary element 25, in which case it can receive radio waves in the FM frequency band. This configuration enables the antenna 40 to receive radio waves in two or more frequency bands, including radio waves in different FM frequency bands.

[0082] Second Embodiment Fig. 2 is a plan view of a vehicle window glass 1 according to a second embodiment of the present invention. In Fig. 2, the same components as those in the above-described embodiment are denoted by the same reference numerals.

[0083] In the second embodiment, the defogger 20 has one short-circuit wire 24c located at the horizontal center of the defogger 20. The bent portion 34 is located directly above the short-circuit wire 24c. The recess 11a at the upper edge 11 of the glass plate 10 is located to the left of the bent portion 34 (short-circuit wire 24c). In other words, in the second embodiment, a motor unit (not shown) is located to the left of the upper edge 11 of the glass plate 10, and the wiper connected to the motor unit swings approximately 90° downward from the horizontal direction in the vertical direction.

[0084] In the second embodiment, the first convex portion 33A bulges horizontally from the upper end of the first bus bar 21a toward the left edge 13 of the glass plate 10 and then protrudes upward. Although the upper end of the first bus bar 21a is bifurcated, it does not have to be bifurcated. In the second embodiment, the second convex portion 33B also bulges horizontally from the upper end of the second bus bar 21b toward the right edge 14 of the glass plate 10, and then protrudes upward. Note that the upper end of the second bus bar 21b is also bifurcated, but it does not have to be bifurcated.

[0085] In the second embodiment, the right end of the first convex portion 33A and the left end of the second convex portion 33B (the overhang portion 35a of the defrosting portion 35) are disposed close to each other. The bent portion 34 is formed between the first convex portion 33A and the second convex portion 33B. The bent portion 34 has a half-loop shape with one of the legs of the trapezoid missing. Specifically, the bent portion 34 has a first leg portion 34d, a lower base portion 34e, a second leg portion 34f, and an upper base portion 34g.

[0086] The first leg 34d bends toward the lower edge 12 of the glass plate 10 relative to the first horizontal portion 36, which bends at a right angle from the first convex portion 33A and extends horizontally toward the right edge 14 of the glass plate 10. The angle formed between the first horizontal portion 36 and the first leg 34d is an acute angle. The bent portion 34 has a first bending point between the first horizontal portion 36 and the first leg 34d. In other words, the first bending point is the connection point between the first horizontal portion 36 and the first leg 34d.

[0087] The lower base 34e bends toward the right edge 14 of the glass plate 10 relative to the first leg 34d, which extends toward the lower edge 12 of the glass plate 10. The angle formed between the first leg 34d and the lower base 34e is an acute angle. The lower base 34e extends horizontally. The bent portion 34 has a second bending point between the first leg 34d and the lower base 34e. In other words, the second bending point is the connection point between the first leg 34d and the lower base 34e.

[0088] The second leg 34f bends toward the upper edge 11 of the glass plate 10 relative to the lower base 34e, which extends horizontally. The angle between the lower base 34e and the second leg 34f is an acute angle, and is the same as the angle between the first leg 34d and the lower base 34e. The bent portion 34 has a third bending point between the lower base 34e and the second leg 34f. In other words, the third bending point is the connection point between the lower base 34e and the second leg 34f.

[0089] The upper base 34g bends toward the left edge 13 of the glass plate 10 relative to the second leg 34f, which extends toward the upper edge 11 of the glass plate 10. The angle formed between the second leg 34f and the upper base 34g is an obtuse angle. The upper base 34g extends horizontally. The bent portion 34 has a fourth bending point between the second leg 34f and the upper base 34g. In other words, the fourth bending point is the connection point between the second leg 34f and the upper base 34g.

[0090] The second leg 34f extends above the upper end (first horizontal portion 36) of the first leg 34d, and the upper base 34g is connected at a right angle to the lower end of the eaves portion 35a of the defrosting unit 35. The bent portion 34 has a fifth bend point between the upper base 34g and the lower end of the eaves portion 35a of the defrosting unit 35. In other words, the fifth bend point is the connection point between the upper base 34g and the eaves portion 35a of the defrosting unit 35. As described above, the bent portion 34 of the second embodiment is formed between the first convex portion 33A and the second convex portion 33B, and has an isosceles trapezoidal shape having first to fifth bending points.

[0091] In the second embodiment, the bent portion 34 of the upper heater wire 30 is closer to the heater wire group 22 in the vertical direction than the first horizontal portion 36, so a virtual straight line L is defined that extends horizontally and passes through the portion of the bent portion 34 that is closest to the heater wire group 22 in the vertical direction (the lower bottom portion 34e).

[0092] The first antenna 40A of the second embodiment has a shape that allows it to be placed in the area surrounded by the imaginary line L and the first convex portion 33A. Specifically, the grounding-side element 44 of the first antenna 40A has a curved shape that follows the left bulge of the first convex portion 33A, and the other antenna elements are the same as those of the first embodiment. The horizontal width W1 of the area surrounded by the imaginary line L and the first convex portion 33A is, for example, 450 mm. The vertical distance h1 between the top end of the first antenna 40A and the heater wire group 22 is, for example, 100 mm.

[0093] The second antenna 40B of the second embodiment has a shape that allows it to be placed in the area surrounded by the imaginary line L and the second convex portion 33B. Specifically, the grounding portion-side element 44 of the second antenna 40B has a curved shape that follows the bulge on the right side of the second convex portion 33B, and the other antenna elements are the same as those of the first embodiment. The horizontal width W2 of the area surrounded by the imaginary line L and the second convex portion 33B is, for example, 450 mm. The vertical distance h2 between the upper end of the second antenna 40B and the heater wire group 22 is, for example, 100 mm.

[0094] The second embodiment may have a third antenna 40C, and in this case, the third antenna 40C is disposed in a region below the defogger 20. The antenna element 46a of the third antenna 40C is a horizontal element extending from the power supply portion 45 toward the center position in the horizontal direction of the glass plate 10. The antenna element 46a may have an auxiliary element 25 extending from the lower end of the defogger 20, and may be capacitively coupled to the horizontal portion of the auxiliary element 25.

[0095] As described above, in the vehicle window glass 1 of the second embodiment, as in the first embodiment, the defogger 20 and the antenna 40 are appropriately arranged on the glass plate 10, thereby achieving both anti-fogging and anti-icing functions and antenna performance.

[0096] The vehicle window glass according to each embodiment of the present invention has been described above, but the present invention is not limited to the above embodiments and can be freely modified within the scope of the present invention. For example, some or all of the embodiments may be combined. Furthermore, in the above embodiments, the number of short-circuit wires has been described as one or three, but the number of short-circuit wires may be two, four or more. Furthermore, the shape and arrangement of the antenna 40 are not limited to the embodiments and may be modified within the scope of the present invention.

[0097] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. [Example]

[0098] The effects of the present invention will be further clarified by the following examples. Note that the present invention is not limited to the following examples, and can be practiced with appropriate modifications within the scope of the present invention.

[0099] [First Example] FIG. 3 is a graph showing antenna characteristics of a vehicle window glass according to a first example of the present invention. The first example is an example of the first embodiment described above, and is a dipole antenna including a power feeder 41, a power feeder-side element 42, a grounding part 43, and a grounding-side element 44, as shown in FIG. 1. FIG. 3 and FIG. 4, which will be described later, show graphs showing actual measurement results of the antenna gain of terrestrial digital television broadcast waves (470 MHz to 710 MHz) combined from first antenna 40A and second antenna 40B. In all graphs, including FIG. 3 and FIGS. 4, 7, and 8, which will be described later, the horizontal axis represents frequency and the vertical axis represents gain. In addition, in FIGS. 3 and 4, "left rear gain" refers to the antenna gain on the left rear side of the vehicle when viewed from above, and "right rear gain" refers to the antenna gain on the right rear side of the vehicle when viewed from above. Referring to FIG. 3, in the first embodiment, high antenna gain was obtained for terrestrial digital television broadcast waves (470 MHz to 710 MHz) on both the left rear side and the right rear side of the vehicle.

[0100] [Second Example] Fig. 4 is a graph showing the antenna characteristics of a vehicle window glass according to a second example of the present invention. The second example is an example of the second embodiment described above. Referring to Fig. 4, the second example also achieved high antenna gain for terrestrial digital television broadcast waves (470 MHz to 710 MHz) on both the left and right sides of the vehicle.

[0101] The effects of the present invention will be further clarified by the following test examples. Note that the present invention is not limited to the following test results and can be practiced with appropriate modifications within the scope of the present invention.

[0102] [Test example] Fig. 5 is a plan view of a test window glass 100 of the present invention. Fig. 6 is a plan view of a test window glass 100 of the present invention equipped with an antenna 40. In Figs. 5 and 6, the same reference numerals are used to designate the same components as those in the above-described embodiment.

[0103] The test window glass 100 shown in Fig. 5 includes a glass plate 10 and a defogger 20. In place of the bent portion 34 described above, an extended portion 22a is formed in the horizontal central region of the defogger 20 by extending a portion of the heater wire group 22. The extended portion 22a protrudes from the central region of the upper end side of the defogger 20 toward the upper edge 11 of the glass plate 10. The test window glass 100 shown in Fig. 6 has pseudo regions of the first convex portion 33A and second convex portion 33B described above formed on both the left and right sides of the extended portion 22a, and a first antenna 40A and a second antenna 40B are arranged therein.

[0104] FIG. 7 is a graph showing antenna characteristics of the test window glass 100 shown in FIG. 6 at the rear left side of the vehicle. FIG. 8 is a graph showing antenna characteristics of the test window glass 100 shown in FIG. 6 at the rear right side of the vehicle. In FIGS. 7 and 8, the widths W1 and W2 on both sides of the extension portion 22a are constant, and the vertical distances h1 and h2 between the upper end of the antenna 40 and the heater wire group 22 are varied to 50.0 mm, 65.0 mm, and 80.0 mm. In this case, h3 and h4 are 20 mm, 35 mm, and 55 mm, respectively. Referring to FIGS. 7 and 8, in the first example, when the vertical distances h1 and h2 between the upper end of the antenna 40 and the heater wire group 22 are set to 50.0 mm or more for terrestrial digital television broadcast waves (470 MHz to 710 MHz), high antenna gain is obtained on both the rear left side and the rear right side of the vehicle. [Explanation of symbols]

[0105] 1. Vehicle window glass 2. Window frames 10 Glass Plate 10A transmission area 10B Shade area 10C Inner edge 11 Upper edge 11a Recess 12 Lower edge 13 Left edge 14 Right edge 20 Defogger 21a 1st bus bar 21b Second bus bar 22 Heater wire group 22a Extension 23 Heater wire 23a heater wire 23b Heater wire 24 Short-circuit wire 24a short circuit wire 24b Short circuit wire 24c short circuit wire 25 Auxiliary element 30 Heater upper line 31 1st end 32 2nd end 33 Convex part 33A 1st convex part 33B Second convex part 34 Bend 34a 1st leg 34b Upper bottom 34c 2nd leg 34d 1st leg 34e lower bottom 34f 2nd leg 34g upper bottom 35 Defrosting section 35a Eaves 36 1st horizontal section 37 2nd horizontal section 40 Antenna 40A First Antenna 40B Second Antenna 40C Third Antenna 41 Power supply unit 42 Power supply element 43 Earth section 44 Earth side element 45 Power supply unit 46 Antenna Element 46a Antenna element 50 Predetermined area 100 Test window glass h1 interval h2 interval h3 interval h4 spacing L Imaginary line W1 width W2 width

Claims

1. A vehicle window glass attached to a window frame at the rear of a vehicle body, A glass plate and an antenna provided on the glass plate and capable of receiving radio waves in a predetermined frequency band; an electrically heated defogger provided on the glass plate; Equipped with When the vehicle window glass is viewed in plan in a state where it is attached to the window frame, the direction parallel to a horizontal plane is defined as the horizontal direction, and the direction perpendicular to the horizontal direction is defined as the vertical direction. The defogger is a group of heater wires in which the heater wires extending in the horizontal direction are aligned in the vertical direction; an upper heater wire positioned above the heater wire group; a first bus bar and a second bus bar extending in the vertical direction at both ends of the glass sheet in the horizontal direction and supplying power to the heater wire group and the heater upper wire, The heater upper line is a first end connected to the first bus bar; a second end connected to the second bus bar; a convex portion that protrudes upward on at least one side of the first bus bar and the second bus bar between the first end and the second end; a bent portion having a plurality of bent points and disposed at a position different from the convex portion between the first end and the second end, At least a portion of the antenna is disposed in an area inside the convex portion, a width of the convex portion in the vertical direction is wider than a distance between two adjacent heater wires in the heater wire group in the vertical direction; The convex portion includes a defrosting portion extending in the horizontal direction. Vehicle window glass.

2. When a virtual straight line is defined that passes through a portion of the upper heater wire that is closest to the heater wire group in the vertical direction at or near the bent portion and extends in the horizontal direction, At least a part of the antenna is disposed within a region surrounded by the imaginary straight line and the convex portion. The vehicle window glass according to claim 1.

3. The bent portion has a half-loop shape. The vehicle window glass according to claim 1.

4. The bent portion surrounds 60% or more of a predetermined region of the glass plate. The vehicle window glass according to claim 3.

5. The predetermined region is triangular or trapezoidal in a plan view of the glass plate. The vehicle window glass according to claim 4.

6. The bent portion has a portion running parallel to at least one of the upper base and the lower base of the trapezoid. The vehicle window glass according to claim 5.

7. The predetermined area includes an optical area of ​​an electronic device facing the glass plate. The vehicle window glass according to claim 4.

8. The vehicle window glass according to claim 1 , wherein the heater upper wire is a single wire.

9. the bent portion is disposed in a central region of the defogger in the horizontal direction. The vehicle window glass according to any one of claims 1 to 7.

10. The antenna has a horizontal length greater than a vertical length. The vehicle window glass according to any one of claims 1 to 7.

11. a distance between the upper end of the antenna and the heater wire group in the vertical direction is 50 mm or more; The vehicle window glass according to any one of claims 1 to 7.

12. a distance between the lower end of the antenna and the heater wire group in the vertical direction is 5 mm or more; The vehicle window glass according to any one of claims 1 to 7.

13. 8. The vehicle window glass according to claim 1, wherein the defogger has a short-circuiting wire that short-circuits at least two of the heater wires in the vertical direction.

14. The vehicle window glass according to claim 1 , wherein the antenna receives radio waves of at least one of a VHF band and a UHF band.

15. The convex portion is a first convex portion protruding upward on the first bus bar side; a second convex portion that protrudes upward on the second bus bar side, The antenna is a first antenna disposed in an area inside the first convex portion; a second antenna disposed in an area inside the second convex portion, The vehicle window glass according to any one of claims 1 to 7.

16. The first antenna and the second antenna are capable of receiving radio waves in the same frequency band.

16. A vehicle window glass according to claim 15.

17. The first antenna and the second antenna receive radio waves in a frequency band of Band III of the DAB standard or radio waves in a frequency band of terrestrial digital broadcasting waves.

17. A vehicle glazing according to claim 16.

18. The antenna includes a third antenna disposed in a region below the defogger.

16. A vehicle window glass according to claim 15.

19. the third antenna is capacitively coupled to an auxiliary element extending from a lower end of the defogger; 19. A vehicle glazing according to claim 18.

20. the third antenna receives radio waves in the FM frequency band; 19. A vehicle glazing according to claim 18.

Images