Vehicle window glass

Abstract

To provide a vehicle window glass that allows radio waves in the UHF band, especially digital terrestrial television broadcast waves, to be received with desired sensitivity, and that has an antenna with a pattern that hardly obstructs passengers' field of vision.SOLUTION: A vehicle window glass includes a glass plate 21 attached to a vehicle body and an antenna 30 provided on the glass plate. The antenna has a first electrode 31 and a feeding element 32 connected to the first electrode, and a second electrode 40 and a grounding element 41 connected to the second electrode. The feeding element has an L-shaped element 33 including a first element 34 extending from the first electrode in a first direction and a second element 35 extending from the first element in a second direction. The grounding element has a first U-shaped element 42 including a third element 43 extending from the second electrode in the first direction, a fourth element 44 extending from the third element in the second direction, and a fifth element 45 extending in a third direction from the end of the fourth element opposite to the third element.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] It is known to place an antenna capable of receiving radio waves in various broadcast frequency bands, such as AM broadcast waves, FM broadcast waves, European standard DAB (Digital Audio Broadcasting) broadcast waves, and terrestrial digital television (DTV) broadcast waves, on window glass installed in the opening of a vehicle.

[0003] Among these broadcast waves, terrestrial digital television broadcast waves have a relatively wide band of approximately 470 MHz to 710 MHz, and vehicle window glass equipped with an antenna that can obtain a desired antenna sensitivity in this band is being developed.

[0004] For example, Patent Documents 1 to 4 listed below disclose vehicle window glass provided with a dipole antenna capable of receiving terrestrial digital television broadcast waves. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-206361 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-273310 [Patent Document 3] Japanese Patent Application Laid-Open No. 2012-085153 [Patent Document 4] Patent Publication No. 2021-002721 Summary of the Invention [Problem to be solved by the invention]

[0006] There is a demand for a vehicle window glass equipped with an antenna that has an antenna pattern different from that disclosed in the above Patent Documents 1 to 4, can receive radio waves in the UHF band, particularly terrestrial digital television broadcast waves, and can be placed in a space-saving manner in the vehicle glass opening.

[0007] In consideration of the above, the present invention aims to provide a vehicle window glass having an antenna that can receive UHF band radio waves, particularly terrestrial digital television broadcast waves, with desired sensitivity and has a pattern that does not obstruct the visibility of occupants. [Means for solving the problem]

[0008] A vehicle window glass according to the present invention comprises a glass sheet to be attached to a vehicle body and an antenna provided on the glass sheet, the antenna having a first electrode, a feeding element connected to the first electrode, and a second electrode, a ground element connected to the second electrode, the feeding element having an L-shaped element including a first element extending in a first direction from the first electrode and a second element extending in a second direction from an end of the first element opposite to the first electrode, the ground element having a first U-shaped element including a third element extending in the first direction from the second electrode, a fourth element extending in the second direction from an end of the third element opposite to the second electrode, and a fifth element extending in a third direction from an end of the fourth element opposite to the third element. the second element is disposed on the first direction side of the fourth element. . Another aspect of the present invention provides a vehicle window glass comprising: a glass sheet to be attached to a vehicle body; and an antenna provided on the glass sheet, wherein the antenna has a first electrode, a feeding element connected to the first electrode, and a second electrode, a ground element connected to the second electrode, the feeding element having an L-shaped element including a first element extending from the first electrode in a first direction and a second element extending in a second direction from an end of the first element opposite to the first electrode, and the ground element has a third element extending from the second electrode in the first direction. a fourth element extending in the second direction from an end of the third element opposite to the second electrode, and a fifth element extending in the third direction from an end of the fourth element opposite to the third element, wherein a partition line dividing the gap between the first electrode and the second electrode and extending along the first direction defines a first region where the first electrode is disposed and a second region where the second electrode is disposed, and the second element intersects the partition line and extends from the first region toward the second region. . A vehicle window glass according to still another aspect of the present invention includes a glass sheet attached to a vehicle body and an antenna provided on the glass sheet, wherein the antenna has a first electrode and a power supply element connected to the first electrode, and a second electrode and a ground element connected to the second electrode, wherein the power supply element has an L-shaped element including a first element extending in a first direction from the first electrode and a second element extending in a second direction from an end of the first element opposite the first electrode, wherein the ground element has a first U-shaped element including a third element extending in the first direction from the second electrode, a fourth element extending in the second direction from an end of the third element opposite the second electrode, and a fifth element extending in a third direction from an end of the fourth element opposite the third element, and wherein the power supply element includes a seventh element electrically connected to the first electrode and extending in the fourth direction. [Effects of the Invention]

[0009] The vehicle window glass according to the present invention has an antenna that can receive UHF band radio waves, particularly terrestrial digital television broadcast waves, with desired sensitivity and has a pattern that does not obstruct the visibility of passengers. [Brief explanation of the drawings]

[0010] [Figure 1]1 is a front view of a vehicle window glass according to a first embodiment of the present invention. [Figure 2] 1 is a front view of an antenna on a vehicle window glass according to a first embodiment of the present invention. [Figure 3] FIG. 6 is a front view of an antenna on a vehicle window glass according to a second embodiment of the present invention. [Figure 4] FIG. 10 is a front view of an antenna on a vehicle window glass according to a third embodiment of the present invention. [Figure 5] FIG. 4 is a diagram showing measurement results of the antenna gain of the antenna according to the first embodiment. [Figure 6] FIG. 10 is a diagram showing the measurement results of the antenna gain of the antenna according to the second embodiment. [Figure 7] FIG. 10 is a diagram showing measurement results of the antenna gain of the antenna according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] First Embodiment A vehicle window glass 20 according to a first embodiment of the present invention will be described below with reference to the accompanying drawings. The vehicle window glass 20 of the first embodiment is installed in a vehicle 10. The X-axis shown in each drawing as appropriate is parallel to the width direction of the vehicle 10 when the vehicle window glass 20 is installed, and the Y-axis is parallel to the vertical direction of the vehicle window glass 20 when the vehicle window glass 20 is installed. Furthermore, downward may be referred to as the "first direction," leftward may be referred to as the "second direction," upward may be referred to as the "third direction," and rightward may be referred to as the "fourth direction." In Figures 2 to 4, UP represents upward, and LH represents leftward. Furthermore, in this specification, "front view" refers to viewing an object along the Y-axis direction.

[0012] 1 is a diagram showing an example of the configuration of a vehicle window glass 20 according to a first embodiment of the present invention. The vehicle window glass 20 is provided on a body 12 of a vehicle 10 as, for example, a vehicle windshield. However, the vehicle window glass 20 can also be used as a rear window or side window for a vehicle.

[0013] 1, the vehicle window glass 20 includes a glass plate 21 and an antenna 30. A camera module mounting portion 24 may be formed in the center of the upper end of the glass plate 21 in the vehicle width direction.

[0014] As shown in FIG. 1, an opening 14 is formed in (the front part of) a vehicle body 12. The opening 14 is a space surrounded by a flange (metal part) provided on the vehicle body 12. For example, a glass plate 21, which is a component of a vehicle window glass 20, is fitted into the opening 14, and the peripheral edge of the glass plate 21 is fixed to the peripheral edge of the opening 14 with an adhesive such as urethane resin. The glass plate 21 is a transparent or translucent plate-shaped dielectric material.

[0015] The camera module mounting portion 24 is an area for installing a camera module (not shown) or the like, and can be equipped with various electronic devices such as a rain sensor as well as a visible light camera or an infrared camera. The camera module mounting portion 24 can be arranged arbitrarily. That is, the vehicle window glass 20 does not need to include the camera module mounting portion 24. If the vehicle window glass 20 includes the camera module mounting portion 24, the antenna 30 may be affected by noise generated from the camera module or the like. Therefore, it is preferable that the distance from the elements constituting the antenna 30 to the camera module mounting portion 24 be set to, for example, 50 mm or more. The distance from the elements constituting the antenna 30 to the camera module is preferably 70 mm or more, and more preferably 100 mm or more.

[0016] 1 indicates the inner peripheral edge of the light-shielding film provided on one main surface of the glass plate 21. The light-shielding film is, for example, an opaque colored ceramic layer, and although the color is arbitrary, a dark color such as black, brown, gray, or dark blue, or white is preferable, and a black ceramic layer is more preferable.

[0017] The antenna 30 is a so-called dipole antenna having two electrodes. The antenna 30 receives radio waves in the frequency band (approximately 470 to 710 MHz, center frequency 590 MHz) of terrestrial digital television broadcast waves (hereinafter referred to as "DTV broadcast waves"). The same or different antennas 30 from various embodiments described below may be combined and arranged in two or more locations on the glass plate 21. For example, if the glass plate 21 is provided with two or more antennas 30 (for receiving DTV broadcast waves), these antennas form a diversity antenna. When the glass plate 21 has two (two-channel) antennas 30 arranged to form a diversity antenna, the antennas 30 may be arranged in two (left and right) regions separated by a central axis in the vertical direction of the glass plate 21, or may be arranged symmetrically (axis-symmetrically) with respect to the central axis. Furthermore, in addition to the antenna 30, the glass plate 21 may be provided with an antenna that receives at least one frequency band other than that received by the antenna 30, for example, AM broadcast waves, FM broadcast waves, and DAB (Band III) broadcast waves.

[0018] 2 is a front view of an antenna 30 of a vehicle window glass 20 according to a first embodiment of the present invention. The antenna 30 provided on the glass plate 21 has a power feeding electrode (first electrode) 31, an earth electrode (second electrode) 40, a power feeding element 32, and a ground element 41. The power feeding element 32 and the ground element 41 are conductors formed to be suitable for receiving radio waves at frequencies for DTV broadcast waves.

[0019] The power supply electrode 31 and the ground electrode 40 are arranged side by side on the glass plate 21 in a direction parallel or approximately parallel to the X-axis direction (second direction), but they may also be arranged diagonally with respect to the X-axis direction. In a front view of the vehicle window glass 20, a front edge portion 12F (see FIG. 1 ) of the roof, which extends in a direction approximately parallel to the second direction (X-axis direction) and is an end portion of a metal portion corresponding to a flange, is located on the third direction side of the power supply electrode 31 and the ground electrode 40. The front edge portion 12F of the roof corresponds to the boundary line between the metal portion and the glass plate 21. The power supply element 32 is connected to the power supply electrode 31, and the ground element 41 is connected to the ground electrode 40.

[0020] The feeding electrode 31 and the earth electrode 40 may each have an approximately rectangular electrode shape, but are not limited to this shape and may be polygonal or circular. Note that an approximately rectangular shape also includes a rectangular shape with rounded corners, i.e., a shape that can be roughly considered a rectangle even though the corners (four corners) are rounded. In the antenna 30, for example, the inner conductor of a coaxial cable (not shown) as an example of a transmission line extending from a signal processing device (not shown) is electrically connected to the feeding electrode 31, and the outer conductor of the coaxial cable is electrically connected to the earth electrode 40. Note that the earth electrode 40 is also referred to as an earth part connected to ground.

[0021] In the antenna 30, the feed element 32 has an L-shaped element 33 that is made up of a first element 34 and a second element 35 and that forms a substantially L shape as a whole.

[0022] The first element 34 extends in the first direction from the power feeding electrode 31 and is connected, for example, to a lower corner of the power feeding electrode 31. However, as long as the power feeding element 32 is electrically connected to the power feeding electrode 31, the connection position is not particularly limited. In this specification, the term "the elements constituting the antenna extend along the Y axis (first direction, third direction)" means that the elements extend in a direction parallel to the Y axis and in a direction approximately parallel to the Y axis when viewed from the front. The term "the elements are approximately parallel to the Y axis" means that the angle between the elements and the Y axis is greater than 0° and may be 30° or less, 20° or less, 10° or less, or 5° or less.

[0023] For example, even if the antenna 30 is provided in the upper end region (on the third direction side) of the glass plate 21, if the first element 34 extends in the first direction from the power supply electrode 31, the distance from the edge of the flange provided on the roof of the vehicle body 12 to the power supply element 32 can be set to a predetermined distance or more (for example, a distance of 30 mm or more). This prevents a decrease in the antenna gain of the antenna 30 caused by the power supply element 32 approaching the edge of the flange.

[0024] In the antenna 30, the second element 35 is an element extending in the second direction from the first element 34 and is connected, for example, near the lower end of the first element 34, i.e., near the other end of the first element 34 that is different from the end on the feeding electrode 31 side. In this specification, the term "the elements constituting the antenna extend along the X-axis (second direction, fourth direction)" means that the elements extend in a direction parallel to the X-axis and in a direction approximately parallel to the X-axis. "The elements are approximately parallel to the X-axis" means that the angle between the elements and the X-axis is greater than 0° and may be 30° or less, 20° or less, 10° or less, or 5° or less.

[0025] In this embodiment, the first element 34 is substantially perpendicular to the second element 35. The angle formed between the first element 34 and the second element 35 is not limited to 90°, and may be, for example, in the range of 60° to 120°, 70° to 110°, 80° to 100°, or 85° to 95°. The same applies to the angles formed between other elements connected to each other, which will be described later.

[0026] Next, the total length of the L-shaped element 33 of this embodiment is defined as DL. In other words, DL is the total length of the first element 34 and the second element 35. When the wavelength of the center frequency in air of the frequency band received by the antenna 30 is λ0 and the wavelength shortening rate of the glass plate 21 is k, the element length DL of the L-shaped element 33 should satisfy the following formula (1), and more preferably the following formula (2): 8 / 64 × λ0× k ≦ DL ≦ 18 / 64 × λ0× k Equation (1) 9 / 64 × λ0× k ≦ DL ≦ 16 / 64 × λ0× k Equation (2) If DL is within the range of equation (1), the L-shaped element 33 resonates in the frequency band of the DTV broadcast waves, improving the antenna gain of the antenna 30, and if DL is within the range of equation (2), the antenna gain is further improved.

[0027] Furthermore, by making the L-shaped element 33 of the antenna 30 horizontally elongated, with the horizontal length being longer than the vertical length, the antenna 30 can be positioned along the end 12F of the flange provided on the roof of the vehicle body 12, making it less likely to obstruct the view of the occupants.

[0028] In the antenna 30, the ground element 41 includes a third element 43, a fourth element 44, a fifth element 45, and a sixth element .

[0029] The third element 43 is an element extending in a first direction from the earth electrode 40 and is connected, for example, to a lower end corner of the earth electrode 40, but the connection position is not particularly limited as long as the ground element 41 is electrically connected to the earth electrode 40.

[0030] The fourth element 44 is an element extending in the second direction from the third element 43, and is connected, for example, near the lower end of the third element 43, i.e., near the other end of the third element 43 different from the one end on the earth electrode 40 side.

[0031] The fifth element 45 is an element that extends in the third direction from the fourth element 44, and is connected to the vicinity of the other end of the fourth element 44 that is different from the one end on the third element 43 side.

[0032] The third element 43, the fourth element 44, and the fifth element 45 form a generally U-shape as a whole. Therefore, the portion consisting of the third element 43, the fourth element 44, and the fifth element 45 is referred to as a first U-shaped element 42.

[0033] The sixth element 46 is an element that extends in the fourth direction from the fifth element 45 and can be added as desired. This also applies to the second and third embodiments described below. The sixth element 46 is connected to, for example, the vicinity of the other end of the fifth element 45 that is different from the end on the fourth element 44 side, and has an open end. Furthermore, the ground element 41 including the first U-shaped element 42 and the sixth element 46 is also referred to as a loop-shaped element 47.

[0034] Next, the overall length of the ground element 41 of this embodiment is defined as DG. In other words, DG is the total length of the third element 43, the fourth element 44, the fifth element 45, and the sixth element 46. The element length DG of the ground element 41 preferably satisfies the following formula (3), and more preferably satisfies the following formula (4). Note that if the sixth element 46 is not included, the element length DG of the ground element 41 corresponds to the total length of the third element 43, the fourth element 44, and the fifth element 45, that is, the length of the first U-shaped element 42. 12 / 64 × λ0× k ≦ DG ≦ 24 / 64 × λ0× k...Equation (3) 14 / 64 × λ0× k ≦ DG ≦ 22 / 64 × λ0× k...Equation (4) If DG is within the range of equation (3), the ground element 41 resonates in the frequency band of the DTV broadcast waves, improving the antenna gain of the antenna 30, and if it is within the range of equation (4), the antenna gain is further improved.

[0035] When viewing the glass plate 21 from the front, a straight line that bisects the gap between the power supply electrode 31 and the earth electrode 40 and extends along the Y axis is defined as a partition line LD. Furthermore, the region of the glass plate 21 to the right of the partition line LD is referred to as a first region AR1, and the region to the left of the partition line LD is referred to as a second region AR2. In this case, the second element 35 intersects the partition line LD and extends from the first region AR1 toward the second region AR2.

[0036] The dimension LL1 (see FIG. 2) of the entire antenna 30 in the X-axis direction is preferably 150 mm or less, more preferably 120 mm or less, and even more preferably 100 mm or less. Here, the dimension LL1 in the X-axis direction refers to the dimension in the X-axis direction between the right edge of the feed electrode 31 and the fifth element 45. If the dimension LL1 is set to 150 mm or less, the entire antenna 30 will be compact.

[0037] Furthermore, when the glass plate 21 is viewed from the front, an imaginary line IL may be formed along the Y-axis that intersects with the second element 35 and the fourth element 44. In other words, the second element 35 and the fourth element 44 are arranged side by side in the vertical direction, and when the above-mentioned imaginary line IL extending in the vertical direction is given, the second element 35 and the fourth element 44 may intersect with the imaginary line IL. Furthermore, when the ground element 41 includes a sixth element 46, an imaginary line IL may be formed that intersects only the second element 35 and the fourth element 44 but does not intersect with the sixth element 46. In this case, the second element 35 is positioned closer to the first direction than the fourth element 44, i.e., farther from the flange end 12F than the fourth element 44.

[0038] Second Embodiment Next, a vehicle window glass 50 according to a second embodiment of the present invention will be described with reference to Fig. 3. Note that the same components as those in the first embodiment are simply given the same reference numerals, and detailed description thereof will be omitted.

[0039] The vehicle window glass 50 of the second embodiment includes the glass plate 21 and an antenna 55. The antenna 55 has the same structure as the antenna 30 except that it includes a seventh element 57. That is, the power supply element 32 of the antenna 55 includes the seventh element 57 in addition to the L-shaped element 33.

[0040] The seventh element 57 is an element extending in the fourth direction from the power supply electrode 31 and is connected, for example, to a lower end corner of the power supply electrode 31, but the connection position is not particularly limited as long as the seventh element 57 is electrically connected to the power supply electrode 31. In this embodiment, the seventh element 57 extends in the fourth direction from the power supply electrode 31 and has an open end.

[0041] In this embodiment, the overall length of the seventh element 57 is defined as D7. The element length D7 of the seventh element 57 preferably satisfies the following formula (5), and more preferably satisfies the following formula (6). 7 / 64 × λ0× k ≦ D7 ≦ 13 / 64 × λ0× k...Equation (5) 8 / 64 × λ0× k≦ D7 ≦ 12 / 64 × λ0× k...Equation (6) If D7 is within the range of equation (5), the seventh element 57 resonates in the frequency band of the DTV broadcast waves, improving the antenna gain of the antenna 55, and if it is within the range of equation (6), the antenna gain is further improved.

[0042] The dimension LL2 (see FIG. 3) of the entire antenna 55 in the X-axis direction is preferably 150 mm or less. Here, the dimension LL2 in the X-axis direction refers to the dimension in the X-axis direction between the right edge of the seventh element 57 and the fifth element 45. If the dimension LL2 is 150 mm or less, the entire antenna 55 becomes compact, which is preferable.

[0043] In this way, the feeding element 32 of the antenna 55 has the seventh element 57 extending from the feeding electrode 31 toward the opposite side to the ground element 41. Therefore, the feeding element 32 and the ground element 41 are oriented in opposite directions, and the current distribution between the feeding electrode 31 and the earth electrode 40 is maximized, thereby improving the antenna gain of the antenna 55 in a predetermined frequency band.

[0044] <Third embodiment> Next, a vehicle window glass 60 according to a third embodiment of the present invention will be described with reference to Fig. 4. Note that the same components as those in the second embodiment are simply given the same reference numerals, and detailed description thereof will be omitted.

[0045] The vehicle window glass 60 of the third embodiment includes a glass plate 21 and an antenna 65. The antenna 65 has the same structure as the antenna 55 except that it includes an eighth element 67 and a ninth element 68.

[0046] The eighth element 67 is an element extending in the first direction from the seventh element 57, and is connected, for example, to the vicinity of an end of the seventh element 57 that is different from the end on the feeding electrode 31 side of the seventh element 57. The ninth element 68 is an element extending in the second direction from the eighth element 67, and is connected, for example, to the vicinity of the lower end of the eighth element 67, i.e., the vicinity of the other end of the eighth element 67 that is different from the end on the seventh element 57 side of the eighth element 67, and has an open end.

[0047] The seventh element 57, the eighth element 67, and the ninth element 68 form a generally U-shape as a whole. Therefore, the portion consisting of the seventh element 57, the eighth element 67, and the ninth element 68 is referred to as a second U-shaped element 69.

[0048] In this embodiment, the total length of the second U-shaped element 69 is defined as DU2. In other words, DU2 is the total length of the seventh element 57, the eighth element 67, and the ninth element 68. The total length DU2 of the second U-shaped element 69 preferably satisfies the following formula (7), and more preferably satisfies formula (8): 17 / 64 × λ0× k ≦ DU2 ≦ 32 / 64 × λ0× k...Equation (7) 20 / 64 × λ0× k ≦ DU2 ≦ 30 / 64 × λ0× k...Formula (8) If DU2 is within the range of equation (7), the second U-shaped element 69 resonates in the frequency band of the DTV broadcast waves, improving the antenna gain of the antenna 65, and if it is within the range of equation (8), the antenna gain is further improved.

[0049] The dimension LL3 (see FIG. 4) of the entire antenna 65 in the X-axis direction is preferably 150 mm or less. Here, the dimension LL3 in the X-axis direction refers to the dimension in the X-axis direction between the right edge of the seventh element 57 (eighth element 67) and the fifth element 45. If the dimension LL3 is 150 mm or less, the entire antenna 65 becomes compact, which is preferable.

[0050] Furthermore, because the second U-shaped element 69 has a folded shape, the antenna 65 can save space and align the direction of current distribution. In this way, by including the second U-shaped element 69 in the antenna 65, the currents in the second U-shaped element 69 become in-phase, thereby achieving an effect of increasing the antenna gain of the antenna 65. Furthermore, by making the second U-shaped element 69 a horizontally elongated shape in which the horizontal length is longer than the vertical length, it can be disposed along the end portion 12F of the flange provided on the roof of the vehicle body 12, making it less likely to obstruct the view of the occupants.

[0051] In the antennas 30, 55, 65 of the vehicle window glasses 20, 50, 60 according to the first to third embodiments, the feeding element 32 may be provided above, rather than below, the feeding electrode 31. In that case, the ground element 41 may be provided above, rather than below, the earth electrode 40.

[0052] Next, the measurement results of the antenna gain in the band of DTV broadcast waves of the antennas 30, 55, 65 provided on the glass plate 21 fixed as a windshield to an actual vehicle will be described with reference to FIGS.

[0053] <Example 1> Fig. 5 is a diagram showing the measurement results of the antenna gain of the antenna 30 according to the first embodiment. Note that the vertical axis in Figs. 5 to 7 represents the antenna gain (unit: dBd), and the horizontal axis represents the frequency (unit: MHz).

[0054] In Example 1, the dimensions of each part of the antenna 30 in Fig. 2 were set as follows. All of the following dimensions satisfy the conditional expressions (1) to (4) described in the first embodiment. The wavelength shortening rate k of the glass plate is approximately 0.64. D1 (first element 34): 15 mm D2 (second element 35): 55 mm DL (L-shaped element 33): 70 mm D3 (third element 43): 10 mm D4 (4th element 44): 50 mm D5 (5th element 45): 10 mm D6 (6th element 46): 20 mm DG (ground element 41): 90 mm Gap between the power supply electrode 31 and the earth electrode 40: 10 mm Overall dimension of antenna 30 in the X-axis direction LL1: 80 mm

[0055] As is clear from the measurement results in FIG. 5, the antenna 30 of the vehicle window glass 20 can receive DTV broadcast waves at a sufficient level.

[0056] <Example 2> FIG. 6 is a diagram showing the measurement results of the antenna gain of the antenna 55 according to the second embodiment.

[0057] In Example 2, the dimensions of each part of the antenna 55 in Fig. 3 were set as follows: All of the following dimensions satisfy the conditional expressions (5) and (6) described in the second embodiment. D1 (first element 34): 15 mm D2 (second element 35): 55 mm DL (L-shaped element 33): 70 mm D3 (third element 43): 10 mm D4 (4th element 44): 50 mm D5 (5th element 45): 10 mm D6 (6th element 46): 20 mm DG (ground element 41): 90 mm D7 (7th element 57): 50mm Gap between the power supply electrode 31 and the earth electrode 40: 10 mm Antenna 55 overall dimension in the X-axis direction LL2: 130 mm

[0058] As is clear from the measurement results in FIG. 6, the antenna 55 of the vehicle window glass 50 can receive DTV broadcast waves at a sufficient level.

[0059] <Example 3> FIG. 7 is a diagram showing the measurement results of the antenna gain of the antenna 65 according to the third embodiment.

[0060] In Example 3, the dimensions of each part of the antenna 65 in Fig. 4 were set as follows: All of the following dimensions satisfy the conditional expressions (7) and (8) described in the third embodiment. D1 (first element 34): 15 mm D2 (second element 35): 55 mm DL (L-shaped element 33): 70 mm D3 (third element 43): 10 mm D4 (4th element 44): 50 mm D5 (5th element 45): 10 mm D6 (6th element 46): 20 mm DG (ground element 41): 90 mm D7 (7th element 57): 50mm D8 (8th element 67): 15mm D9 (9th element 68): 60mm DU2 (second U-shaped element 69): 125 mm Gap between the power supply electrode 31 and the earth electrode 40: 10 mm Antenna 65 overall dimension in the X-axis direction LL3: 130 mm

[0061] As is clear from the measurement results in FIG. 7, the antenna 65 on the vehicle window glass 60 can receive DTV broadcast waves at a sufficient level.

[0062] The configurations of the first to third embodiments described above are examples of the content of the present invention, and may be combined with other known technologies, or some of the configurations may be omitted or modified without departing from the gist of the present invention.

[0063] The open end of each element is located at the tip in the extension direction, but the vicinity of the tip may have a portion bent in a direction different from the extension direction. Furthermore, the vicinity of the tip on the opposite side of the open end of each element may also have a portion bent in a direction different from the extension direction. In this way, the shape of the elements constituting each antenna may be partially different from the antenna shape shown in each embodiment, as long as it does not deviate from the receiving sensitivity. [Explanation of symbols]

[0064] 12 Body 20 Vehicle window glass 21 Glass Plate 30 Antenna 31 Power supply electrode (first electrode) 32 Power supply element 33 L-shaped element 34 First Element 35 Second Element 40 Earth electrode (second electrode) 41 Grounding element 42 First U-shaped element 43 Third Element 44 Fourth Element 45 5th Element 46 6th Element 47 Loop Elements 50 Vehicle window glass 55 Antenna 57 Seventh Element 60 Vehicle window glass 65 Antenna 67 8th Element 68 9th Element 69 Second U-shaped element LD partition line AR1 1st area AR2 2nd area IL Imaginary line

Claims

1. a glass plate attached to the vehicle body; an antenna provided on the glass plate; Equipped with The antenna is a first electrode and a power supply element connected to the first electrode; a second electrode and a ground element connected to the second electrode; and the power supply element has an L-shaped element including a first element extending in a first direction from the first electrode and a second element extending in a second direction from an end of the first element opposite to the first electrode, the ground element has a first U-shaped element including: a third element extending in the first direction from the second electrode; a fourth element extending in the second direction from an end of the third element opposite the second electrode; and a fifth element extending in a third direction from an end of the fourth element opposite the third element; The second element is disposed on the first direction side of the fourth element.

2. a glass plate attached to the vehicle body; an antenna provided on the glass plate; Equipped with The antenna is a first electrode and a power supply element connected to the first electrode; a second electrode and a ground element connected to the second electrode; and the power supply element has an L-shaped element including a first element extending in a first direction from the first electrode and a second element extending in a second direction from an end of the first element opposite to the first electrode, the ground element has a first U-shaped element including: a third element extending in the first direction from the second electrode; a fourth element extending in the second direction from an end of the third element opposite the second electrode; and a fifth element extending in a third direction from an end of the fourth element opposite the third element; When a first region is defined as a region in which the first electrode is disposed and a second region is defined as a region in which the second electrode is disposed, with a partition line that divides the gap between the first electrode and the second electrode in half and that extends along the first direction as a boundary, The second element intersects the partition line and extends from the first region toward the second region.

3. a glass plate attached to the vehicle body; an antenna provided on the glass plate; Equipped with The antenna is a first electrode and a power supply element connected to the first electrode; a second electrode and a ground element connected to the second electrode; and the power supply element has an L-shaped element including a first element extending in a first direction from the first electrode and a second element extending in a second direction from an end of the first element opposite to the first electrode, the ground element has a first U-shaped element including: a third element extending in the first direction from the second electrode; a fourth element extending in the second direction from an end of the third element opposite the second electrode; and a fifth element extending in a third direction from an end of the fourth element opposite the third element; The vehicle window glass, wherein the power supply element includes a seventh element electrically connected to the first electrode and extending in a fourth direction.

4. 2. The vehicle window glass according to claim 1, wherein the grounding element has a loop-shaped element including a sixth element extending in a fourth direction from an end of the fifth element opposite to the fourth element.

5. The vehicle window glass according to claim 2 , wherein an imaginary line extending along the first direction intersects with the second element and the fourth element.

6. The element length DG of the ground element is set to λ 0.5, which is the wavelength of the center frequency in air in the frequency band received by the antenna. ０ , and the wavelength shortening rate of the glass plate is k, 12 / 64 × λ ０ × k ≦ DG ≦ 24 / 64 × λ ０ × k The vehicle window glass according to any one of claims 1 to 5, which satisfies the following:

7. The element length DL of the L-shaped element is set to λ = ... ０ , and the wavelength shortening rate of the glass plate is k, 8 / 64 × λ ０ × k ≦ DL ≦ 18 / 64 × λ ０ × k The vehicle window glass according to any one of claims 1 to 6, which satisfies the following:

8. 4. The vehicle window glass according to claim 3, wherein the power supply element has a second U-shaped element including the seventh element, an eighth element extending in the first direction from an end of the seventh element opposite to the first electrode, and a ninth element extending in the second direction from an end of the eighth element opposite to the seventh element.

9. The seventh element of the feeding element has an open end at its tip end, The element length D7 of the seventh element is set to λ 1 / λ 2 , which is the wavelength of the center frequency in the air in the frequency band received by the antenna. ０ , and the wavelength shortening rate of the glass plate is k, 7 / 64 × λ ０ × k ≦ D7 ≦ 13 / 64 × λ ０ × k 4. The vehicle window glass according to claim 3, which satisfies the following:

10. The element length DU2 of the second U-shaped element is set to λ 1 / λ 2 , which is the wavelength of the center frequency in air in the frequency band received by the antenna. ０ , and the wavelength shortening rate of the glass plate is k, 17 / 64 × λ ０ × k ≦ DU2 ≦ 32 / 64 × λ ０ × k 9. The vehicle window glass according to claim 8, which satisfies the following:

11. The vehicle window glass according to claim 1 , wherein the first electrode and the second electrode are arranged parallel or substantially parallel to the second direction.

12. 12. The vehicle window glass according to claim 11, wherein the width of the antenna in the parallel direction is 150 mm or less.

13. 13. The vehicle window glass according to claim 11, wherein when the glass plate is attached to the vehicle body, a metal portion that is substantially parallel to the second direction is arranged on the third direction side of the first electrode and the second electrode.

14. The vehicle window glass according to claim 1 , wherein the antenna is capable of receiving radio waves in a frequency band for terrestrial digital television broadcast waves.

15. 15. The vehicle window glass according to claim 1, wherein the glass sheet comprises at least one of a windshield, a side glass, and a rear glass.

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