JP2020161975A - Vehicle glass - Google Patents

Abstract

To obtain a vehicle glass which can receive a radio wave of a predetermined frequency while suppressing deterioration of antifogging and antifreezing effects of a glass plate.SOLUTION: A vehicle glass 100 includes: a glass plate 1 to be used for vehicle body 200; an upper bus bar 3; a lower bus bar 4; a heating region 2; and an antenna 50 which is provided on at least a part of an upper part region 8 between an upper side part of an opening and the upper bus bar 3. The antenna 50 includes a plurality of elements and is arranged in an antenna region 5 having a length in a lateral direction longer than a length in a vertical direction, in a plan view of the glass plate 1. When letting D1 be a distance from the upper side part of the antenna region 5 to the upper side part of the opening, and D2 be a distance from the lower side part of the antenna region 5 to the upper bus bar 3, D1 is 5 mm or longer and D2 is 20 mm or longer.SELECTED DRAWING: Figure 1

Description

The present invention relates to vehicle glass.

A technique for heating a windshield by energizing a transparent conductive film provided between a plurality of glass plates is known in order to maintain the driver's visibility by preventing fogging and ice on the windshield for automobiles. The transparent conductive film is a heating layer that heats the glass plate. Further, there is also known a technique in which an antenna capable of receiving radio waves of a predetermined frequency is incorporated in a glass plate for an automobile so that an energization heating function by a transparent conductive film and a radio wave reception function by the antenna coexist.

For example, Patent Document 1 discloses a configuration in which a heating layer provided on a windshield, a first bus bar, a second bus bar, and an antenna including a portion electrically connected to the heating layer are used in combination. There is. The first bus bar and the second bus bar are strip-shaped electrodes provided on the upper and lower sides of the heating layer for passing an electric current through the heating layer and extending in the lateral width direction of the vehicle body of the automobile.

Special Table 2018-502428

Here, when the antenna is mainly composed of a pattern having an element extending in the horizontal direction, the width in the horizontal (horizontal) direction is wider than the width in the vertical (vertical) direction of the antenna in the region where the antenna is arranged. Become. As disclosed in Patent Document 1, when the antenna having such a wide width in the lateral direction is separated from the heating layer energized by the upper and lower bus bars extending in the vehicle width direction and arranged independently, the area of the heating layer Can reduce the effect of anti-fog and anti-icing. Since conventional vehicle glass is not intended to be equipped with such an antenna, it is necessary to receive radio waves of a predetermined frequency while suppressing the deterioration of the anti-fog and anti-icing effects of the glass plate due to the heating layer. There is room for improvement.

The present invention has been made in view of the above, and an object of the present invention is to obtain a vehicle glass capable of receiving radio waves of a predetermined frequency while suppressing a decrease in the effect of antifogging and antiicing of a glass plate.

In order to solve the above-mentioned problems and achieve the object, the vehicle glass according to the present invention includes a glass plate provided at the opening of the vehicle body and an upper bus bar provided above the glass plate and extending in a substantially horizontal direction. It has a lower bus bar provided on the lower side of the glass plate and extending in a substantially horizontal direction. The vehicle glass includes a heating region for heating the glass plate by a voltage applied between the upper bus bar and the lower bus bar, and the upper side portion of the opening and the said portion of the entire region in which the glass plate is viewed in a plan view. It has an antenna provided in at least a portion of the upper area between the upper bus bar. The antenna has a feeding portion and a plurality of elements connected to the feeding portion, and is arranged in an antenna region in which the length in the horizontal direction when the glass plate is viewed in a plan view is longer than the length in the vertical direction. .. When the distance from the upper side of the antenna region to the upper side of the opening is D1 and the distance from the lower side of the antenna region to the upper bus bar is D2, the D1 is 5 mm or more, and the D2 is It is 20 mm or more.

According to the present invention, there is an effect that radio waves of a predetermined frequency can be received while suppressing a decrease in the effect of anti-fog and anti-icing of a glass plate.

It is a figure which shows the structural example of the vehicle glass 100 which concerns on embodiment of this invention. It is a figure which shows the opening 210 of the vehicle body 200. It is an enlarged view of the antenna area 5 shown in FIG. 1 and the periphery of the antenna area 5. It is a figure which shows the measurement result of the antenna gain at the time of changing the value of D2 while the value of D1 is fixed to a constant value. It is a figure which shows the 1st modification of the vehicle glass 100 which concerns on embodiment of this invention. It is a figure which shows the 2nd modification of the vehicle glass 100 which concerns on embodiment of this invention. It is a figure which shows the 3rd modification of the vehicle glass 100 which concerns on embodiment of this invention. It is a figure which shows the 4th modification of the vehicle glass 100 which concerns on embodiment of this invention. It is a figure which shows the 5th modification of the vehicle glass 100 which concerns on embodiment of this invention. It is a figure which shows the 6th modification of the vehicle glass 100 which concerns on embodiment of this invention. It is a figure which shows the 7th modification of the vehicle glass 100 which concerns on embodiment of this invention. It is a figure which shows the 8th modification of the vehicle glass 100 which concerns on embodiment of this invention. It is a figure which shows the 9th modification of the vehicle glass 100 which concerns on embodiment of this invention.

The vehicle glass according to the embodiment of the present invention will be described in detail below with reference to the drawings. In each form, deviations to the extent that the effects of the present invention are not impaired are allowed in the directions of parallel, right angle, horizontal, vertical, vertical, horizontal, and the like. Further, the X-axis direction, the Y-axis direction, and the Z-axis direction represent a direction parallel to the X-axis, a direction parallel to the Y-axis, and a direction parallel to the Z-axis, respectively. The X-axis direction, the Y-axis direction, and the Z-axis direction are orthogonal to each other. The XY plane, YZ plane, and ZX plane are a virtual plane parallel to the X-axis direction and the Y-axis direction, a virtual plane parallel to the Y-axis direction and the Z-axis direction, and a virtual plane parallel to the Z-axis direction and the X-axis direction, respectively. Represents.

Embodiment.
FIG. 1 is a diagram showing a configuration example of a vehicle glass 100 according to an embodiment of the present invention. FIG. 2 is a diagram showing an opening 210 of the vehicle body 200. FIG. 1 shows a vehicle glass 100 viewed in a plan view from the inside to the front of the vehicle body 200, which is the skeleton of an automobile. The vehicle glass 100 is applied to, for example, a windshield or a rear glass for an automobile. In the present embodiment, in order to simplify the explanation, an example in which the vehicle glass 100 is applied to the windshield will be described.

In FIGS. 1 and 2 and thereafter, the X-axis and the Y-axis are two axes perpendicular to each other. The direction parallel to the X-axis is the X-axis direction. The X-axis direction is equal to the left-right direction (lateral direction) of the vehicle body 200, the vehicle width direction of the vehicle body 200, or the horizontal direction. Of the X-axis directions, the direction indicated by the arrow is the plus X-axis direction, and the direction opposite to the direction is the minus X-axis direction. The direction parallel to the Y-axis is the Y-axis direction. The Y-axis direction is equal to the vertical direction (vertical direction) or the vertical direction of the vehicle body 200. Of the Y-axis directions, the upward direction indicated by the arrow is the plus Y-axis direction, and the downward direction opposite to the direction is the minus Y-axis direction.

The upper side 201 of the vehicle body 200 in the plus Y-axis direction is equal to the edge of the flange provided on the roof (ceiling) of the vehicle body 200. The lower side portion 202 of the vehicle body 200 in the minus Y-axis direction is equal to the edge portion of the flange provided on the dash panel of the vehicle body 200. The side portion 203 of the vehicle body 200 in the plus X-axis direction is equal to the edge portion of the flange of the A pillar on the right side when facing the front of the vehicle body 200. The side portion 203 of the vehicle body 200 in the minus X-axis direction is equal to the edge portion of the flange of the A pillar on the left side when facing the front of the vehicle body 200.

The vehicle glass 100 includes a glass plate 1, an upper bus bar 3 provided above the glass plate 1 and extending substantially horizontally, and a lower bus bar 4 provided below the glass plate 1 and extending substantially horizontally. It has a heating region 2 and an antenna 50. The substantially horizontal direction also includes a direction parallel to a line segment forming an angle of, for example, 0 ° to ± 15 ° with respect to a horizontal plane orthogonal to the vertical direction.

The glass plate 1 is a transparent or translucent plate-shaped dielectric provided in the opening 210 of the vehicle body 200 shown in FIG. The opening 210 is a space surrounded by a flange provided on the vehicle body 200.

The heating region 2 is provided between the upper bus bar 3 and the lower bus bar 4, and is a transparent or translucent conductive material that heats the glass plate 1 by the voltage applied between the upper bus bar 3 and the lower bus bar 4. It has a film and the like. Further, the heating region 2 may have a transparent conductive film, one having a heat-generating wire installed on the surface of the glass plate 1, one having a silver-based print for heat generation, or the like. As magnified in FIG. 1, the heating region 2 has, for example, a plurality of wavy heating wires 21 arranged at predetermined intervals. As the plurality of wavy heating wires 21, those that are wavyly wired from the upper bus bar 3 to the lower bus bar 4 can be used. Then, when a voltage is applied between the upper bus bar 3 and the lower bus bar 4, a current flows in the heating region 2, and the heating region 2 generates heat, so that the glass plate 1 is heated. This makes it possible to melt snow, melt ice, and prevent fogging of flat glass. As the heat generating wire, copper, aluminum, chromium, molybdenum, nickel, titanium, palladium, indium, tungsten, gold, platinum, silver, and alloys containing a plurality of these can be used.

When the heating region 2 is composed of a transparent conductive film, antimony-doped tin oxide, bismuth-doped tin oxide, or fluorine-doped tin oxide can be used as the material of the transparent conductive film.

When the glass plate 1 is, for example, a laminated glass having a resin interlayer film sandwiched between two glass plates, the heating region 2 is not limited to the case where it is formed by the wavy heating wire 21 described above, and a plurality of plates are formed. It may be arranged so as to spread out in a plane between the shaped dielectrics, or may be arranged so as to be sandwiched between an interlayer film (not shown) and one plate-shaped dielectric. Further, the heating region 2 may be in a form in which a conductive material (for example, silver or the like) is vapor-deposited on the surface of the glass plate 1 by a sputtering method or the like to form a coating.

In the vehicle glass 100 according to the present embodiment, the end 6 of the heating region 2 provided on the left side of the opening 210 and the end 6 of the heating region 2 provided on the right side of the opening 210 are glass plates 1. They are arranged so that the distance between them increases in the horizontal direction (X-axis direction) from the top to the bottom.

The upper bus bar 3 is a band-shaped electrode connected to the upper side of the heating region 2, and is connected to the ground portion via the electrode 31. The ground portion is a negative electrode of a DC power source such as a battery, a vehicle body 200 (frame ground), or the like. The upper bus bar 3 may be any band-shaped electrode connected to the upper side of the heating region 2, and is not limited to one band-shaped electrode extending in the horizontal direction.

The lower bus bar 4 is a band-shaped electrode connected to the lower side of the heating region 2, and is connected to the power supply unit via the electrode 41. The power supply unit is, for example, a positive electrode of a DC power source such as a battery. The lower bus bar 4 may be any band-shaped electrode connected to the lower side of the heating region 2, and is not limited to one band-shaped electrode extending in the horizontal direction.

The upper bus bar 3 may be connected to the power supply unit, and the lower bus bar 4 may be connected to the ground unit. When the glass plate 1 is laminated glass, each of the upper bus bar 3 and the lower bus bar 4 may be arranged between a plurality of plate-shaped dielectrics, or an interlayer film (not shown) and one plate-shaped one. It may be arranged so as to be sandwiched between the dielectric and the dielectric. Further, each of the upper bus bar 3 and the lower bus bar 4 may be arranged in the same layer as the heating region 2, or may be arranged in different layers as long as an electrical connection with the heating region 2 can be secured via the auxiliary member. Good.

The antenna 50 is, for example, a bipolar antenna having a feeding unit as two electrodes for receiving horizontally polarized waves of radio waves (frequency band of about 470 to 710 MHz) in the frequency band of terrestrial digital television broadcasting (DTV). Each element constituting the antenna 50 will be described with reference to FIG. 3, which corresponds to an enlarged view of the antenna 50 in FIG. When the antenna 50 is a bipolar antenna, for example, the inner conductor of a coaxial cable extending from a signal processing device (not shown) is electrically connected to the first feeding unit 61 (HOT), and the outer conductor of the coaxial cable is the first. It is electrically connected to the power feeding unit 62 (GND) of 2. The second power feeding unit 62 is also referred to as a grounding unit connected to the ground.

The antenna 50 is provided in at least a part of the upper region 8. The upper region 8 is an region between the upper side portion 201 (upper side portion of the opening 210) of the vehicle body 200 and the upper bus bar 3 in the entire region of the glass plate 1 in a plan view. The antenna 50 has an element 50a connected to the first feeding unit 61 and an element 50b connected to the second feeding unit 62, and is arranged in the antenna region 5. The element 50a is also referred to as a power feeding side element, and the element 50b is also referred to as a ground side element.

The element 50a is an antenna conductor formed so as to be suitable for receiving horizontally polarized waves of DTV radio waves. The element 50a is connected to, for example, a signal processing circuit (not shown). The element 50a has, for example, a first element 50a1, a second element 50a2, a third element 50a3, and a fourth element 50a4. The first element 50a1 extends from the first feeding portion 61 in the plus X-axis direction. The second element 50a2 is arranged apart from the first element 50a1 in the minus Y-axis direction, and extends from the first feeding portion 61 in the plus X-axis direction. The third element 50a3 extends from the end of the first element 50a1 to the end of the second element 50a2, comes into contact with the first element 50a1 and the second element 50a2, and extends further in the minus Y-axis direction than the second element 50a2. .. The fourth element 50a4 is arranged away from the second element 50a2 in the minus Y-axis direction, and extends in the minus X-axis direction from the end of the third element 50a3. The first element 50a1, the second element 50a2, and the fourth element 50a4 are connected to each other via the third element 50a3. In particular, the first power feeding unit 61, the first element 50a1, the second element 50a2, and the third element 50a3 form a loop element, and the third element 50a3 and the fourth element 50a4 form the second feeding unit 62 side ( Arranged to fold back in the minus X-axis direction).

The element 50b is, for example, a conductor connected to the vehicle body 200. The element 50b has, for example, a fifth element 50b1, a sixth element 50b2, and a seventh element 50b3. The fifth element 50b1 extends from the second feeding portion 62 in the minus Y-axis direction. The sixth element 50b2 extends in the minus X-axis direction from the midpoint of the fifth element 50b1. The seventh element 50b3 is arranged away from the sixth element 50b2 in the minus Y-axis direction, and extends from the end of the fifth element 50b1 in the plus X-axis direction and the minus X-axis direction. The sixth element 50b2 and the seventh element 50b3 are connected to each other via the fifth element 50b1. The antenna 50 may have an auxiliary element (not shown) for adjusting the antenna gain for the element 50a and the element 50b.

The antenna area 5 is a horizontally long area in which the length in the horizontal direction when the glass plate 1 is viewed in a plan view is longer than the length in the vertical direction, and can be defined as a region in which the antenna is substantially rectangular, and includes all the antenna 50. It is a substantially rectangular area that is the minimum area. The antenna region 5 is provided between the upper side portion 201 of the vehicle body 200 and the upper bus bar 3. The antenna region 5 is the narrowest horizontally long region including at least all the antenna patterns in the region including the feeding portion (first feeding portion 61, the second feeding portion 62) and the antenna patterns (elements 50a and 50b). is there. By setting the horizontally long antenna region 5, the height of the antenna 50 in the Y-axis direction can be lowered, and the horizontal polarization in the entire frequency band of the DTV radio wave can be satisfactorily received while expanding the heating region 2.

Note that FIG. 1 shows an arrangement in which the antenna region 5 is provided near the side side portion 203 of the vehicle body 200 in the minus X-axis direction. However, the position where the antenna region 5 is provided may be any predetermined position between the upper side portion 201 of the vehicle body 200 and the upper bus bar 3, which will be described later, and may be near the center of the vehicle body 200 in the X-axis direction, or the vehicle body 200. It may be closer to the side portion 203 in the plus X-axis direction of.

Further, in many cases, a camera module (not shown) is installed near the center in the X-axis direction between the upper side portion 201 of the vehicle body 200 and the upper bus bar 3. When the camera module is installed at such a position, in order to reduce the influence of noise generated from the camera module, the antenna region 5 is located near one of the two left and right side sides 203, or It is desirable to provide two locations near both the left and right side side portions 203.

FIG. 3 is an enlarged view of the antenna region 5 shown in FIG. 1 and the periphery of the antenna region 5. Here, the distance from the upper side portion 51 of the antenna region 5 to the upper side portion 201 (upper side portion of the opening 210) of the vehicle body 200 is D1, and the distance from the lower side portion 52 of the antenna region 5 to the upper bus bar 3 is D2. At that time, D1 may be 5 mm or more, and D2 may be 20 mm or more. The upper side portion 51 of the antenna region 5 is equal to the uppermost portion of the antenna 50. The uppermost portion of the antenna 50 is the end portion in the plus Y-axis direction of the first feeding portion 61, the end portion in the plus Y-axis direction of the second feeding portion 62, and the upper side portion of the vehicle body 200 in the first element 50a1. This is the part closest to 201. Further, the lower side portion 52 of the antenna region 5 is equal to the lowermost portion of the antenna 50. The lowermost part of the antenna 50 corresponds to the seventh element 50b3 in this case.

The distance D1 corresponds to, for example, the shortest distance connecting the portion where the first feeding portion 61 or the first element 50a1 and the upper side portion 201 of the vehicle body 200 are closest to each other by a virtual straight line. As the value of D1 becomes larger, the leakage (attenuation) of the received signal of the antenna 50 to the vehicle body 200 is reduced, and the mixing of noise from the vehicle body 200 into the received signal of the antenna 50 is reduced. This is because when the distance D1 is set to 5 mm or more, it is easy to suppress the deterioration of the antenna performance due to the capacitive coupling of the antenna 50 with the metal body (vehicle body 200). Further, the distance D1 is preferably 6 mm or more, more preferably 8 mm or more. On the other hand, if the distance D1 is too long, the heating region 2 may be narrowed. Therefore, the distance D1 may be 20 mm or less, preferably 15 mm or less, and more preferably 10 mm or less. In general, the value may be set from 5 mm to 10 mm for the reason of design such as hiding the feeding point in the interior.

The distance D2 corresponds to, for example, the shortest distance connecting the portion where the seventh element 50b3 and the upper bus bar 3 are closest to each other with a virtual straight line. As the value of D2 becomes larger, the leakage of the reception signal of the antenna 50 to the upper bus bar 3 is reduced, and the mixing of noise from the upper bus bar 3 into the reception signal of the antenna 50 is reduced.

However, as the values of D1 and D2 increase, the width of the heating region 2 in the vertical direction tends to become narrower, so that the antifogging and antiicing effects of the glass plate 1 may decrease. Therefore, the vehicle glass 100 according to the present embodiment will be described with reference to FIG. 4 so as to enable reception of radio waves in a predetermined frequency band and suppress deterioration of the antifogging and antiicing effects of the glass plate 1. By measuring the antenna gain, the optimum values of D1 and D2 were set.

The length of each antenna element used for measuring the antenna gain is as follows.

1st element 50a1: 100mm
Second element 50a2: 100 mm
Third element 50a3: 15mm
Fourth element 50a4: 115mm
Fifth element 50b 1:15 mm
6th element 50b2: 85mm
7th element 50b3: 115mm
The length of the first power feeding unit 61 and the second power feeding unit 62 in the Y-axis direction is 19 mm, and the seventh element 50b3 is 65 mm in the minus X-axis direction starting from the end of the fifth element 50b1. , 50 mm in the plus X-axis direction. As a result, the antenna region 5 is a substantially rectangular shape extending in the horizontal direction at 207 mm × 34 mm.

FIG. 4 is a diagram showing the measurement result of the antenna gain when the value of D2 is changed while the value of D1 is fixed to a constant value. The vertical axis of FIG. 4 is the antenna gain (unit: dBi), and the horizontal axis is the frequency. The antenna gain data in FIG. 4 shows the case where the center of the vehicle body 200 to which the vehicle glass 100 is assembled is set at the center of the turntable and the vehicle body 200 is rotated 360 ° in a state where D1 is 5 mm. It is a plot of the average value of the antenna gain of. The average value of the antenna gain is, for example, the average value of a plurality of data measured every 1 ° of the rotation angle and every 12 MHz in the frequency band of DTV.

The thick solid line A is the data when the value of D2 is set to 30 mm. The broken line B is the data when the value of D2 is set to 25 mm. The alternate long and short dash line C is the data when the value of D2 is set to 20 mm. The normal solid line D is a reference value. The reference value is, for example, the average value of the gain [dBi] in the DTV frequency band of 470 to 720 MHz, and is set to -3 [dBi] in the present embodiment. Specifically, in FIG. 4, the position of the lowest line (7th element 50b3) of the antenna 50 was fixed, the upper bus bar 3 was lowered in the minus Y-axis direction, and the value of D2 was changed to 20 mm, 25 mm, and 30 mm. The gain of the antenna 50 at that time is shown. According to the measurement result of FIG. 4, the antenna gain is better when the value of D2 is 25 mm than 20 mm, and the antenna gain is further better when the value of D2 is 30 mm than 25 mm. That is, it can be confirmed that the gain of the antenna 50 is improved by increasing the distance between the lowest line (7th element 50b3) of the antenna 50 and the upper bus bar 3.

This phenomenon is caused by the fact that as the heat ray conductor including the upper bus bar 3 is arranged closer to the antenna 50, the directivity of the antenna 50 is directed upward and the antenna gain in the horizontal plane is lowered. That is, it is considered that the heat ray conductor including the upper bus bar 3 functions as a reflector, and the closer the conductor is arranged to the antenna, the more the directivity of the antenna tends to be in the direction opposite to that of the conductor. As described above, since there is a trade-off relationship between the improvement of the antenna gain of the antenna 50 and the securing of the wide heating region 2, it is necessary to secure a predetermined distance that is compatible with the distance between the antenna 50 and the upper bus bar 3. .. In this embodiment, if the distance D2 between the lowest line (7th element 50b3) of the antenna 50 and the upper bus bar 3 is 20 mm or more, a constant antenna gain can be obtained. Further, the distance D2 is preferably 25 mm or more, more preferably 30 mm or more.

In the vehicle glass 100 according to the present embodiment, since the horizontally elongated antenna region 5 is provided in a part of the upper region 8 along the horizontal direction, the vertically elongated antenna region 5 is provided in a part of the upper region 8. The width of the heating region 2 in the vertical direction can be widened as compared with the case where the heating region 2 is provided. Further, in the vehicle glass 100 according to the present embodiment, D1 is set to 5 mm or more and D2 is set to 20 mm or more, so that the required value of the required antenna gain can be satisfied. Therefore, according to the vehicle glass 100 according to the present embodiment, it is possible to receive radio waves in a predetermined frequency band while suppressing deterioration of the anti-fog and anti-icing effects of the glass plate 1.

In the vehicle glass 100 according to the present embodiment, the distance D3 from the upper side portion 201 (upper side portion of the opening 210) of the vehicle body 200 provided so as to sandwich the antenna 50 to the upper bus bar 3 is preferably 80 mm or less. , 75 mm or less is more preferable, and 70 mm or less is further preferable.

The distance D3 is defined as a portion of the upper side portion 201 of the vehicle body 200 that faces the upper side portion 51 of the antenna region 5 and a portion of the upper bus bar 3 that faces the lower side portion 52 of the antenna region 5 that are closest to each other. It corresponds to the shortest distance connected by a virtual straight line.

According to the vehicle glass 100, by setting the distance D3 to 80 mm or less, the upper region 8 in which the antenna region 5 is provided is expanded as much as possible while suppressing the narrowing of the vertical width of the heating region 2. be able to. Therefore, since the degree of freedom of the wiring pattern of the element 50a of the antenna 50 provided in the antenna region 5 can be increased, it is possible to secure the driver's field of view while maintaining good reception of radio waves in a predetermined frequency band.

In the vehicle glass 100 according to the present embodiment, the distance D4 from the upper side portion 51 of the antenna region 5 to the lower side portion 52 of the antenna region 5 is preferably 40 mm or less, more preferably 35 mm or less.

According to the vehicle glass 100, by setting D4 to 40 mm or less, the height of the antenna region 5 can be lowered as compared with the case where D4 exceeds 40 mm, so that the vertical width of the heating region 2 is relative. Can be expanded. Therefore, it is possible to further suppress the deterioration of the anti-fog and anti-icing effects of the glass plate 1 while enabling the reception of radio waves in a predetermined frequency band. The distance D4 can also be combined with the vehicle glass 100 in which the distance D3 is set to 80 mm or less.

Hereinafter, a modified example of the vehicle glass 100 shown in FIG. 1 will be described.

FIG. 5 is a diagram showing a first modification of the vehicle glass 100 according to the embodiment of the present invention. In the vehicle glass 100A of FIG. 5, the upper bus bar 3A has a crank portion 7, and a recessed region 81 is formed in the upper region 8. The antenna 50 is provided in the recessed region 81.

The upper bus bar 3A has a crank portion 7, a first lateral end side 71 extending from the crank portion 7 to one side, and a second lateral end side 72 extending from the crank portion 7 to the other side.

The crank portion 7 includes a vertical end side 73, a first bent portion 91 formed at a connection portion between the first horizontal end side 71 and the vertical end side 73, and a second horizontal end side 72 and a vertical end side 73. It has a second bent portion 92 formed at a connecting portion and is formed in a crank shape. The crank portion 7 is provided on the left side of the vertical center line 211. The vertical center line 211 is a virtual line that equally divides the opening 210 into a right side region and a left side region.

The vertical end side 73 is provided between the first horizontal end side 71 and the second horizontal end side 72, and extends from the first horizontal end side 71 toward the second horizontal end side 72 in a substantially vertical direction. The vertical end side 73 includes a part of the first bent portion 91 and a part of the second bent portion 92. The first bent portion 91 is a portion including a contact point where the vertical end side 73 is in contact with the first horizontal end side 71 and a proximity region before and after the contact point. The second bent portion 92 is a portion including a contact point in which the vertical end side 73 contacts the second horizontal end side 72 and a proximity region before and after the contact point.

The first lateral end side 71 extends in the minus X-axis direction when viewed from the first bent portion 91, and the second lateral end side 72 extends in the plus X-axis direction when viewed from the second bent portion 92. The first lateral end side 71 includes a part of the first bent portion 91, and the second lateral end side 72 includes a part of the second bent portion 92.

The recessed region 81 is a recessed region of the entire upper region 8 that is recessed in the direction from the upper side portion 201 (upper side portion of the opening 210) of the vehicle body 200 toward the upper bus bar 3A with the crank portion 7 as a boundary. .. By forming the recessed region 81 in the upper region 8, a region 82 other than the recessed region is formed in the upper region 8. In the drawing, the upper end (in the plus Y-axis direction) of the vertical end side 73 is located below the upper side portion 51 of the antenna region 5 (in the minus Y-axis direction), but is above the upper side portion 51. It may be located (plus Y-axis direction). The heating region 2 can be further expanded by locating the upper end of the vertical end side 73 above the upper side portion 51 of the antenna region 5 (in the plus Y-axis direction).

According to the vehicle glass 100A, by providing the antenna 50 in the recessed region 81, the width of the region 82 other than the recessed region 82 in the height direction can be made narrower than the width of the recessed region 81 in the height direction. As a result, the width of the heating region 2 connected to the second lateral end side 72 in the height direction becomes relatively wide, and while enabling reception of radio waves in a predetermined frequency band, the glass plate 1 is anti-fog and anti-fog. The decrease in the effect of ice can be further suppressed.

FIG. 6 is a diagram showing a second modification of the vehicle glass 100 according to the embodiment of the present invention. The difference from the vehicle glass 100A of FIG. 5 is that in the vehicle glass 100B of FIG. 6, the lower bus bar 4A has a first lower bus bar 4A1 and a second lower bus bar 4A2, and the first lower bus bar 4A1 has a heating region 2A. Is to be connected to. Further, in the vehicle glass 100B of FIG. 6, the distance D5 from the lower side portion 202 (lower side portion of the opening 210) of the vehicle body 200 in the vertical direction to the first lower bus bar 4A1 is from the lower side portion of the opening 210 in the vertical direction. The distance to the second lower bus bar 4A2 is narrower than D6.

The distance D5 corresponds to the shortest distance between the lower side portion 202 of the vehicle body 200 and the first lower bus bar 4A1 connecting the portions closest to each other by a virtual straight line. Further, the distance D6 corresponds to the shortest distance between the lower side portion 202 of the vehicle body 200 and the second lower bus bar 4A2 connecting the portions closest to each other by a virtual straight line.

In the vehicle glass 100B, the heating region 2 includes a heating region 2A and a heating region 2B. The heating region 2A is a region formed by projecting the recessed region 81 of the entire heating region 2 in a substantially vertical direction toward the upper bus bar 3A (first horizontal end side 71). That is, the heating region 2A is a region in which the recessed region 81 of the entire heating region 2 is viewed in a substantially vertical direction toward the upper bus bar 3A. The first lower bus bar 4A1 is connected to the heating region 2A. The second lower bus bar 4A2 is connected to the heating region 2B. The heating region 2B is a region formed by projecting a region 82 other than the recessed region of the entire heating region 2 toward the upper bus bar 3A (second horizontal end side 72) in a substantially vertical direction.

According to the vehicle glass 100B, the distance from the lower side portion 202 (lower side portion of the opening 210) of the vehicle body 200 to the first lower bus bar 4A1 is larger than the distance from the lower side portion of the opening 210 to the second lower bus bar 4A2. Since it is narrow, the vertical width of the heating region 2A connected to the first lower bus bar 4A1 can be widened. Therefore, while enabling reception of radio waves in a predetermined frequency band, the distance between the upper bus bar 3A and the lower bus bar 4A can be made constant, and the resistance between the upper bus bar 3A and the lower bus bar 4A can be made substantially uniform. Local heating unevenness due to the heating region 2A can be suppressed.

FIG. 7 is a diagram showing a third modification of the vehicle glass 100 according to the embodiment of the present invention. In the vehicle glass 100C of FIG. 7, when the length of the first lateral end side 71 in the horizontal direction is D7, it is preferable that D7 is set to 250 mm or more. The D7 is preferably 260 mm or more, more preferably 270 mm or more. On the other hand, if the length of D7 is longer than necessary, the heating regions 2 and 2B in the plus X-axis direction and on the upper side 201 side are narrower than the crank portion 7, so 350 mm or less is preferable, and 300 mm or less is more. preferable.

According to the vehicle glass 100C, by setting D7 to be 250 mm or more, the width of the antenna region 5 is widened as compared with the case where D7 is set to less than 250 mm, for example, the horizontal polarization of DTV radio waves. It is possible to increase the degree of freedom of the wiring pattern of the element 50a of the antenna 50 that receives the signal. Therefore, it is possible to secure the driver's field of view while maintaining good reception of radio waves in a predetermined frequency band. The configuration of the vehicle glass 100C can also be combined with the vehicle glass 100A and 100B described above.

FIG. 8 is a diagram showing a fourth modification of the vehicle glass 100 according to the embodiment of the present invention. In the vehicle glass 100D of FIG. 8, when the distance from the conductor to the crank portion 7 in the antenna region 5 is D8, D8 is set to 20 mm or more. The distance from the antenna region 5 to the crank portion 7 is the shortest distance between the conductor and the crank portion 7 in the antenna region 5, and in FIG. 8, for example, the portion where the third element 50a3 and the crank portion 7 are closest to each other is virtual. It corresponds to the shortest distance connected by a straight line.

According to the vehicle glass 100D, by setting D8 to 20 mm or more, the antenna by the crank portion 7 of the upper bus bar 3A provided near the side side portion 53 of the antenna region 5 as compared with the case where D8 is less than 20 mm. The decrease in gain can be suppressed and the antenna gain can be increased. The influence of the crank portion 7 of the upper bus bar 3A is leakage of the received signal of the antenna 50 to the crank portion 7. The configuration of the vehicle glass 100D can also be combined with the vehicle glass 100B and 100C described above. The D8 is preferably 30 mm or more, more preferably 40 mm or more. On the other hand, if the length of D8 is longer than necessary, the heating regions 2 and 2B in the plus X-axis direction and on the upper side 201 side are narrower than the crank portion 7, so 100 mm or less is preferable, and 60 mm or less is more. preferable.

FIG. 9 is a diagram showing a fifth modification of the vehicle glass 100 according to the embodiment of the present invention. The difference from the vehicle glass 100A of FIG. 5 is that the vehicle glass 100E of FIG. 9 is provided with recessed regions 81 on the left side and the right side of the vertical center line 211, respectively.

In FIG. 9, the antenna region 5 is provided in the recessed region 81 on the left side, but instead of the recessed region 81 on the left side, the antenna region 5 may be provided in the recessed region 81 on the right side, or two recessed portions. An antenna region 5 is provided in each of the regions 81, and may be used as, for example, a 2-channel DTV diversity antenna device.

In FIG. 9, the upper bus bar 3B has two crank portions 7. By providing the two crank portions 7, two recessed regions 81 are formed in the upper region 8. The recessed region 81 on the left side is provided closer to the side side portion 203 in the minus X-axis direction of the vehicle body 200, and the recessed region 81 on the right side is provided closer to the side side portion 203 in the plus X-axis direction of the vehicle body 200. The antenna region 5 can be provided in both or one of the two recessed regions 81.

According to the vehicle glass 100E, the antenna region 5 can be easily secured according to various specifications of the vehicle body 200, such as when the vehicle body 200 has a right steering wheel specification and when the vehicle body 200 has a left steering wheel specification. Further, when the diversity antenna is configured, for example, since the antenna region 5 can be provided in the recessed regions 81 on the driver's side and the passenger's seat side, the degree of freedom in tuning the antenna pattern is increased, and the antenna gain can be further increased. it can. The configuration of the vehicle glass 100E can also be combined with the vehicle glass 100C and 100D described above.

FIG. 10 is a diagram showing a sixth modification of the vehicle glass 100 according to the embodiment of the present invention. In the vehicle glass 100F of FIG. 10, it is a schematic view showing how the glass plate 1 has a camera module mounting portion 9 and the distance from the antenna region 5 to the camera module mounting portion 9 is set to 100 mm or more.

A camera module (not shown) is attached to the camera module mounting portion 9. The distance from the antenna region 5 to the camera module mounting portion 9 corresponds to, for example, the shortest distance between the antenna region 5 and the camera module mounting portion 9 connecting the portions closest to each other with a virtual straight line.

According to the vehicle glass 100F, the distance from the antenna region 5, particularly the antenna element to the camera module mounting portion 9, may be set to 100 mm or more. In this case, the separation distance from the camera module can be increased as compared with the case where the distance from the antenna region 5, particularly the antenna element to the camera module mounting portion 9 is set to less than 100 mm, and the noise generated from the camera module can be increased. The effect is reduced and the antenna gain can be increased. The distance from the antenna element to the camera module is preferably 120 mm or more, more preferably 150 mm or more.

FIG. 11 is a diagram showing a seventh modification of the vehicle glass 100 according to the embodiment of the present invention. In the vehicle glass 100G of FIG. 11, each of the upper bus bar 3 and the lower bus bar 4 is composed of the divided upper bus bars 3a and 3b and the divided lower bus bars 4a and 4b. Further, the heating region 2 is composed of a heating region 2a which is a divided heating region divided into two corresponding to each of the divided upper bus bars 3a and 3b and the divided lower bus bars 4a and 4b. A crank portion 7 is provided on the divided upper bus bar 3a. Each of the plurality of divided upper bus bars 3a and 3b and the divided lower bus bars 4a and 4b are strip-shaped electrodes extending in the horizontal direction.

According to the vehicle glass 100G, for example, a bus bar formed of a conductive material having common dimensions can be used for the divided upper bus bar 3b and the divided lower bus bars 4a and 4b other than the divided upper bus bar 3a. Therefore, as compared with the case where the upper bus bar 3 and the lower bus bar 4 shown in FIG. 5 and the like are used, the production of the vehicle glass 100G becomes easier. Further, the lengths of the divided upper bus bar 3a and the divided lower bus bar 4a, the lengths of the divided upper bus bar 3b and the divided lower bus bar 4b are constant, and further, the distance between the divided upper bus bar 3a and the divided lower bus bar 4a, Since the distance between the divided upper bus bar 3b and the divided lower bus bar 4b is also constant, local heating unevenness due to the heating region 2a can be suppressed. The configuration of the vehicle glass 100G can also be combined with the vehicle glass 100C to 100F described above.

FIG. 12 is a diagram showing an eighth modification of the vehicle glass 100 according to the embodiment of the present invention. In the vehicle glass 100H of FIG. 12, the end 6 of the heating region 2 provided on the left side of the opening 210 and the end 6 of the heating region 2 provided on the right side of the opening 210 are parallel to each other. That is, the end 6 of the heating region 2 provided on the left side of the opening 210 and the end 6 of the heating region 2 provided on the right side of the opening 210 are mutually arranged from the top to the bottom of the glass plate 1. They are arranged so that the distance is constant.

According to the vehicle glass 100H, the upper bus bar 3 and the lower bus bar 4 formed of a conductive material having common dimensions can be used, so that the upper bus bar 3 and the lower bus bar 4 having different dimensions and shapes as shown in FIG. The production of vehicle glass 100H becomes easier than when it is used. Further, since the lengths of the upper bus bar 3 and the lower bus bar 4 are constant, and the distance between the upper bus bar 3 and the lower bus bar 4 is also constant, local heating unevenness due to the heating region 2 can be suppressed.

FIG. 13 is a diagram showing a ninth modification of the vehicle glass 100 according to the embodiment of the present invention. In the vehicle glass 100I of FIG. 13, a black ceramic film 11 that hides at least a part of the antenna 50 or the antenna region 5 is provided. For the black ceramic film 11, for example, a concealing member for concealing the frame and wiring when fixing the vehicle glass 100I to the vehicle body 200 can be used.

According to the vehicle glass 100I, at least a part of the antenna 50 or the antenna region 5 provided in the upper region 8 is concealed by the black ceramic film 11, so that the vehicle glass 100 has anti-fog and anti-icing effects. While obtaining, the design of the vehicle glass 100I can be improved. The configuration of the vehicle glass 100I can also be combined with the vehicle glass 100C to 100I described above.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1 glass plate, 2 heating area, 2A heating area, 2B heating area, 2a divided heating area, 3 upper bus bar, 3A upper bus bar, 3B upper bus bar, 3a divided upper bus bar, 3b divided upper bus bar, 4 lower bus bar, 4A lower bus bar 4, 4A1 1st lower bus bar, 4A2 2nd lower bus bar, 4a split lower bus bar, 4b split lower bus bar, 5 antenna area, 6 end, 7 crank part, 8 upper area, 9 camera module mounting part, 11 black ceramic film, 21 wavy heating wire, 31 electrodes, 41 electrodes, 50 antennas, 50a element, 50a1 first element, 50a2 second element, 50a3 third element, 50a4 fourth element, 50b element, 50b1 fifth element, 50b2 sixth element, 50b3 7th element 51 upper side, 52 lower side, 53 side side, 61 first power feeding part, 62 second feeding part, 71 first horizontal end side, 72 second horizontal end side, 73 vertical end side, 81 recessed area, 82 area, 91 first bent part, 92 second bent part, 100 vehicle glass, 100A vehicle glass, 100B vehicle glass, 100A vehicle glass, 100B vehicle glass, 100C vehicle glass, 100D Vehicle glass, 100E vehicle glass, 100F vehicle glass, 100G vehicle glass, 100H vehicle glass, 100I vehicle glass, 200 car body, 201 upper side, 202 lower side, 203 side side, 210 opening, 211 Vertical centerline.

Claims (18)

The glass plate provided at the opening of the car body and
An upper bus bar provided on the upper side of the glass plate and extending in a substantially horizontal direction,
A lower bus bar provided on the lower side of the glass plate and extending in a substantially horizontal direction,
A heating region that heats the glass plate by the voltage applied between the upper bus bar and the lower bus bar,
An antenna provided in at least a part of the upper region between the upper side portion of the opening and the upper bus bar in the entire region of the glass plate in a plan view.
Have,
The antenna has a feeding portion and a plurality of elements connected to the feeding portion, and is arranged in an antenna region in which the length in the horizontal direction when the glass plate is viewed in a plan view is longer than the length in the vertical direction.
When the distance from the upper side of the antenna region to the upper side of the opening is D1, and the distance from the lower side of the antenna region to the upper bus bar is D2.
The D1 is 5 mm or more,
Vehicle glass having a D2 of 20 mm or more. When the distance from the upper side of the opening provided so as to sandwich the antenna to the upper bus bar is D3,
The vehicle glass according to claim 1, wherein the D3 is 80 mm or less. When the distance from the upper side of the antenna area to the lower side of the antenna area is D4,
The vehicle glass according to claim 1 or 2, wherein the D4 is 40 mm or less. The upper bus bar has a crank portion bent in a crank shape, and has a crank portion.
In the upper region, a concave region, which is a concave region recessed in the direction from the upper side portion of the opening toward the upper bus bar, is formed with the crank portion as a boundary.
The vehicle glass according to any one of claims 1 to 3, wherein the antenna is provided in the recessed region. The lower bus bar
A first lower bus bar provided in a region formed by projecting the recessed region in a substantially vertical direction toward the upper bus bar and connected to the heating region.
It has a second lower bus bar provided in a region formed by projecting a region other than the recessed region in the upper region in a substantially vertical direction toward the upper bus bar and connected to the heating region.
The vehicle glass according to claim 4, wherein the distance from the lower side portion of the opening in the vertical direction to the first lower bus bar is narrower than the distance from the lower side portion of the opening to the second lower bus bar in the vertical direction. .. The upper bus bar
The first lateral end extending to one side of the crank portion and
It has a second lateral end side extending to the other side of the crank portion, and has.
When the horizontal length of the first horizontal end side is D7,
The vehicle glass according to claim 4 or 5, wherein the D7 is 250 mm or more. When the shortest distance from the element to the crank portion is D8,
The vehicle glass according to any one of claims 4 to 6, wherein the D8 is 20 mm or more. The vehicle glass according to any one of claims 4 to 7, wherein the recessed region is formed in at least one of the left-sided region of the opening and the right-sided region of the opening in the upper region. .. Two recessed regions are provided on each of the left and right sides of the vertical center line that equally divides the opening into the right side region and the left side region in the upper region.
The vehicle glass according to claim 8, wherein the antenna is provided in each of the two recessed regions. The vehicle glass according to claim 9, wherein the antenna is a diversity antenna. The glass plate has a camera module mounting portion to which the camera module is mounted.
The vehicle glass according to any one of claims 1 to 10, wherein the distance from the element to the camera module mounting portion is 100 mm or more. The vehicle glass according to any one of claims 1 to 11, wherein the antenna can receive radio waves in the frequency band of terrestrial digital television broadcasting waves. Each of the upper bus bar and the lower bus bar is composed of two divided bus bars.
The vehicle glass according to any one of claims 1 to 12, wherein the heating region is composed of a divided heating region divided into two corresponding to each of the divided bus bars. The vehicle glass according to any one of claims 1 to 13, wherein the heating region has a plurality of wavy heating wires extending in the vertical direction. The vehicle glass according to any one of claims 1 to 13, wherein the heating region is a transparent conductive film. The aspect according to any one of claims 1 to 15, wherein the end portion of the heating region provided on the left side of the opening and the end portion of the heating region provided on the right side of the opening are parallel to each other. Vehicle glass. The vehicle glass according to any one of claims 1 to 16, wherein the glass plate is a windshield of the vehicle body. The vehicle glass according to any one of claims 1 to 17, which is provided on the glass plate and has a black ceramic film that hides at least a part of the antenna region.

Images