JP2019077571A - Glass laminate for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated glass for a vehicle capable of simplifying wiring of a heating structure. SOLUTION: This is a laminated glass for a vehicle having a first glass plate, a second glass plate facing the first glass plate, and an interlayer film for adhering the first glass plate and the second glass plate. , The first bus and the second bus that face each other at intervals in the first direction between the first glass plate and the second glass plate, and between the first bus and the second bus. It has a third bus and a first heating region and a second heating region arranged in a second direction orthogonal to the first direction. In the first heating region, a voltage is formed by the first bus and the second bus. A first heating wire that generates heat by applying a voltage is provided, and a second heating wire that generates heat by applying a voltage from the second bus and the third bus is provided in the second heating region. [Selection diagram] Fig. 4

Description

  The present invention relates to a laminated glass for a vehicle.

  Conventionally, laminated glass is used as a window glass for vehicles. FIG. 1 is a front view of a heating structure of a visible region of a laminated glass for a vehicle according to a conventional example as viewed from the outside of the vehicle. In FIG. 1, in order to simplify the drawing, the number of first heating wires 151 is illustrated smaller than the actual number. FIG. 2 is a cross-sectional view of a conventional laminated glass for a vehicle. FIG. 3 is a front view of the heating structure at the wiper stop position of the laminated glass for a vehicle according to the conventional example as viewed from the outer side of the vehicle. In FIGS. 1 and 3, the left side is the driver's seat side, and the right side is the passenger seat side. Further, in FIG. 1 and FIG. 3, an area indicated by a spotted pattern represents an installation area of the first light shielding film 102 and the second light shielding film 103 (hereinafter also referred to as “light shielding area”), and an area 105 surrounded by a broken line Represents the movement area of The stop position of the wiper is set at the lower side of the laminated glass 1 for a vehicle. The illustration of the heating structure at the wiper stop position shown in FIGS. 2 and 3 is omitted in FIG. 1, and the illustration of the heating structure in the visible region shown in FIGS. 1 and 2 is omitted in FIG.

  As shown in FIG. 2, the laminated glass 101 for a vehicle bonds the first glass plate 110, the second glass plate 120 facing the first glass plate 110, and the first glass plate 110 and the second glass plate 120. An intermediate film 130 is provided. The first glass plate 110 is provided on the vehicle outer side than the second glass plate 120, and the second glass plate 120 is provided on the vehicle inner side than the first glass plate 110. In general, the laminated glass 101 for vehicles has a curved shape that is convex toward the outside of the vehicle.

  The laminated glass 101 for a vehicle is manufactured by laminating a first glass plate 110, an intermediate film 130, and a second glass plate 120 in this order to produce a polymer, and pressurizing and heating the produced polymer with an autoclave or the like. Be done. Before producing the polymer, the first glass plate 110 and the second glass plate 120 are heat-treated and bent. The polymer may be obtained by stacking the second glass plate 120, the intermediate film 130, and the first glass plate 110 in this order.

  As shown in FIG. 1, the laminated glass 101 for a vehicle has a first bus bar 141 facing each other at an interval in a first direction (for example, the vertical direction) between the first glass plate 110 and the second glass plate 120. And a second heating wire 151, and a first heating wire 151 which generates a voltage by applying a voltage by the first and second buses 141 and 142. The first bus bar 141, the second bus bar 142 and the first heating wire 151 are conductive and fixed to the insulating intermediate film 130, and then the insulating first glass plate 110 and the insulating second film are insulated. It is sandwiched between the glass plates 120.

  The first bus bar 141 is provided on the upper side of the laminated glass 101 for a vehicle. On the other hand, the second bus bar 142 is provided at the lower side of the laminated glass 1 for a vehicle. The first bus bar 141 and the second bus bar 142 are hidden from the vehicle exterior by the first light shielding film 102 provided on the first glass plate 110. Further, the first bus line 141 and the second bus line 142 are hidden from the inside of the vehicle by the second light shielding film 103 provided on the second glass plate 120.

  The first bus bar 141 is connected to the first pole (for example, the negative electrode) of the power supply 180 via the first lead bus bar 171. On the other hand, the second bus 142 is connected to the second pole (e.g., positive electrode) of the power supply 180 via the second lead bus 172. When a voltage is applied between the first bus 141 and the second bus 142, a current flows through the first heating wire 151, generating Joule heat. As a result, the cloudiness (water droplets) and ice adhering to the surface of the laminated glass 101 for a vehicle are removed.

  By the way, as shown in FIG. 1, a plurality of first heating wires 151 are provided at intervals in a second direction (for example, a vehicle width direction) orthogonal to the first direction, and heat the rectangular heating area. On the other hand, the laminated glass 101 for vehicles is normally formed in an equal leg trapezoidal shape. The lower side of the laminated glass 101 for a vehicle is longer than the upper side of the laminated glass 101 for a vehicle. Therefore, it was difficult to heat the entire lower side of the laminated glass 101 for a vehicle.

  In patent document 1, in order to heat the laminated glass for vehicles entirely, a plurality of heating wires are arranged in a diverging line. Specifically, a plurality of heating wires are arranged such that the distance between the adjacent heating wires gradually increases from the upper side toward the lower side. Furthermore, the length of each heating wire is adjusted so that the resistance of each heating wire becomes the same. Each heating wire is formed in a straight line when viewed from the distance but is formed in a wave when viewed in an enlarged manner. By adjusting the wave period, the lengths of the heating wires are made the same.

  According to Patent Document 1, although the laminated glass for a vehicle can be entirely heated, the operation of arranging a plurality of heating wires in a diverging line and the operation of adjusting the lengths of the heating wires to be the same are complicated. . In order to omit these operations, as shown in FIG. 2 and FIG. 3, a second heating wire 152 for heating the lower side of the laminated glass 101 may be provided (see, for example, Patent Document 2).

  The second heating wire 152 is formed on the first light shielding film 102 as shown in FIG. The first light shielding film 102 is formed by firing a paste of black ceramic. The firing may be performed simultaneously with the heat treatment for bending the first glass plate 110. As shown in FIG. 3, the second heating wire 152 heats the stop position of the wiper set at the lower side of the laminated glass 101 for a vehicle.

JP-A-9-207718 Unexamined-Japanese-Patent No. 10-1027

  As shown in FIGS. 1 to 3, two bus bars that apply a voltage to both ends of the first heating wire 151 heating the visible region of the laminated glass 101 for a vehicle and a second heating wire 152 heating the stop position of the wiper Wiring was complicated when the two bus lines which apply a voltage to both ends were provided separately.

  This invention is made in view of the said subject, Comprising: It aims at provision of the laminated glass for vehicles which can simplify wiring of a heating structure.

According to one aspect of the present invention, in order to solve the above problems,
A laminated glass for a vehicle, comprising: a first glass plate, a second glass plate opposed to the first glass plate, and an intermediate film bonding the first glass plate and the second glass plate,
A first bus bar and a second bus bar facing each other at intervals in the first direction between the first glass plate and the second glass plate, and a second bus bar provided between the first bus bar and the second bus bar And three heating lines, and a first heating area and a second heating area aligned in a second direction orthogonal to the first direction,
The first heating region is provided with a first heating wire that generates a heat by applying a voltage by the first bus and the second bus.
A laminated glass for a vehicle is provided in the second heating area, provided with a second heating wire which generates a voltage by applying a voltage by the second bus and the third bus.

  According to one aspect of the present invention, there is provided a laminated glass for a vehicle which can simplify the wiring of the heating structure.

FIG. 1 is a front view of a heating structure of a visible region of a laminated glass for a vehicle according to a conventional example as viewed from the outside of the vehicle. FIG. 2 is a cross-sectional view of a conventional laminated glass for a vehicle. FIG. 3 is a front view of the heating structure at the wiper stop position of the laminated glass for a vehicle according to the conventional example as viewed from the outer side of the vehicle. FIG. 4 is a front view of the heating structure of the laminated glass for a vehicle according to one embodiment as viewed from the outer side of the vehicle. FIG. 5 is a cross-sectional view of a laminated glass for a vehicle according to one embodiment. FIG. 6 is a front view showing a state in which the first bus segment, the second bus segment, and the third bus segment are fixed to the intermediate film according to the embodiment. 7 is a front view showing a state in which the first heating wire and the second heating wire are fixed to the intermediate film of FIG. FIG. 8 is a front view showing a state in which the first bus segment, the second bus segment, and the third bus segment are fixed to the intermediate film of FIG. FIG. 9 is a front view showing a state in which the surplus portion of the first heating wire and the surplus portion of the second heating wire of FIG. 8 are cut away. FIG. 10 is a front view showing a state in which the first lead bus bar and the second lead bus bar are fixed to the intermediate film of FIG. FIG. 11: is the front view which looked at the heating structure of the laminated glass for vehicles by a 1st modification from the vehicle outer side. FIG. 12 is a front view of a heating structure of a laminated glass for a vehicle according to a second modification as viewed from the outer side of the vehicle.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and the description thereof will be omitted. In the following description, “upper” and “lower” indicate “vertically above” and “vertically lower” when the laminated glass for a vehicle is attached to the window frame of the vehicle.

  In FIG. 4, the left side is the driver's seat side, and the right side is the passenger seat side. Further, in FIG. 4, the area indicated by a spotted pattern represents the installation area of the first light shielding film 2 and the second light shielding film 3 (hereinafter also referred to as “light shielding area”), and the area 5 surrounded by a broken line is the moving area of the wiper Represents The stop position of the wiper is set at the lower side of the laminated glass 1 for a vehicle. Further, in FIG. 4, for simplification of the drawing, the number of first heating wires 51 and the number of second heating wires 52 are illustrated less than the actual number.

  The laminated glass 1 for vehicles adheres the 1st glass plate 10, the 2nd glass plate 20 which opposes the 1st glass plate 10, and the 1st glass plate 10 and the 2nd glass plate 20, as shown in FIG. An intermediate film 30 is provided. The first glass plate 10 is provided on the vehicle outer side than the second glass plate 20, and the second glass plate 20 is provided on the vehicle inner side than the first glass plate 10. In addition, the number of sheets of the glass plate which comprises the laminated glass 1 for vehicles may be three or more. When the number of glass plates constituting the laminated glass 1 for a vehicle is three or more, the number of intermediate films may be two or more.

  The first glass plate 10 may be either inorganic glass or organic glass. Examples of the inorganic glass include soda lime glass and the like. The inorganic glass may be either untempered glass or tempered glass. Untempered glass is obtained by forming molten glass into a plate and annealing. The tempered glass is a non-tempered glass on which a compressive stress layer is formed. The tempered glass may be either physically tempered glass (eg, air-cooled tempered glass) or chemically tempered glass. On the other hand, examples of the organic glass include transparent resins such as polycarbonate. The same applies to the second glass plate 20.

  The first glass plate 10 is formed to be convex toward the outside of the vehicle. As bending of the first glass plate 10, gravity forming, press forming or the like is used. When the first glass plate 10 is a physically tempered glass, the glass plate heated uniformly in bending is rapidly cooled from the temperature near the softening point, and a compressive stress is applied to the glass surface by the temperature difference between the glass surface and the inside of the glass. The glass surface may be strengthened by generating it. When the first glass plate 10 is a chemically strengthened glass, the glass surface may be strengthened by generating compressive stress on the glass surface by an ion exchange method or the like after bending. The same applies to the second glass plate 20.

  A first light shielding film 2 that hides wiring and the like from the vehicle outer side is provided on an outer peripheral portion of the first glass plate 10 on the vehicle inner side. The first light shielding film 2 is formed by firing a paste of black ceramic applied to the inner surface of the first glass plate 10. The firing may be performed simultaneously with the heat treatment for bending the first glass plate 10.

  On the other hand, on the outer peripheral portion of the second glass plate 20, a second light shielding film 3 is provided which hides wiring and the like from the inside of the vehicle. The second light shielding film 3 is formed by firing a paste of black ceramic applied to the inner surface of the second glass plate 20. The firing may be performed simultaneously with the heat treatment for bending the second glass plate 20.

  In addition, although the laminated glass 1 for vehicles has both the 1st light shielding film 2 and the 2nd light shielding film 3 in this embodiment, you may have only any one. In addition, the first light shielding film 2 may be provided on the outer surface of the first glass plate 10. Similarly, the second light shielding film 3 may be provided on the outer surface of the second glass plate 20.

  The intermediate film 30 is formed of a general resin, for example, a thermoplastic resin such as polyvinyl butyral resin (PVB) or ethylene-vinyl acetate copolymer resin (EVA). The interlayer 30 develops adhesiveness when heated. The intermediate film 30 may have either a single layer structure or a multiple layer structure.

  The laminated glass 1 for a vehicle is manufactured by laminating a first glass plate 10, an intermediate film 30 and a second glass plate 20 in this order to produce a polymer, and pressurizing and heating the produced polymer with an autoclave or the like. Be done. Before producing the polymer, the first glass plate 10 and the second glass plate 20 are heat-treated and bent. The polymer may be obtained by stacking the second glass plate 20, the intermediate film 30, and the first glass plate 10 in this order.

  The laminated glass 1 for vehicles has a heating structure in order to remove the frost (for example, water droplet) and ice which were stuck on the surface. Hereinafter, the heating structure of the right side (passenger seat side) half of the laminated glass 1 for a vehicle according to the present embodiment will be described. The heating structure of the left half (driver's seat side) half of the laminated glass 1 for a vehicle according to this embodiment is the same as the heating structure of the left half of the conventional laminated glass 101 for a vehicle, and thus the description thereof is omitted.

  The heating structure of the left half of the laminated glass 1 for a vehicle of this embodiment is the same as the heating structure of the left half of the conventional laminated glass for a vehicle 101, but the right side of the laminated glass 1 for a vehicle of this embodiment ( The passenger side may be configured in the same manner as the half heating structure. A heating structure is suitably selected according to the stop position of a wiper. The same applies to the first modification (FIG. 11) and the second modification (FIG. 12).

  The laminated glass 1 for vehicles is, as shown in FIG. 4, a first bus bar 41 facing each other at an interval in a first direction (for example, the vertical direction) between the first glass plate 10 and the second glass plate 20. And a second bus bar 42, and a first heating area 61. The first heating area 61 includes, for example, a visible area, a light shielding area above the visible area, and a light shielding area below the visible area. The visible region is a region where the driver visually recognizes the outside of the vehicle, and is, for example, a region overlapping with the opening of the first light shielding film 2 and the opening of the second light shielding film 3. The first heating region 61 is provided with a first heating wire 51 which generates a voltage by applying a voltage from the first bus 41 and the second bus 42. The line width of the first heating wire 51 is narrower than the line width of the first bus 41 and the line width of the second bus 42. Copper, aluminum or the like is suitably used as the first bus 41 and the second bus 42. Tungsten or the like is suitably used as the first heating wire 51.

  As shown in FIG. 4, the first bus bar 41 is provided on the upper side of the laminated glass 1 for a vehicle, is hidden from the outside by the first light shielding film 2, and is hidden from the inside by the second light shielding film 3. As shown in FIG. 5, the first bus bar 41 is divided into two first bus bar segments 411 and 412 in the thickness direction, and the first heating wire 51 is interposed between the two first bus bar segments 411 and 412. Hold the upper end in place and secure. A solder layer etc. not shown is provided in the mutually opposing surface of the two 1st bus-line division pieces 411 and 412, and the upper end part of the 1st heating wire 51 is fixed by a solder layer. The adhesive layer is not limited to the solder layer, and may be an adhesive layer made of a conductive material.

  On the other hand, as shown in FIG. 4, the second bus bar 42 is provided on the lower side of the laminated glass 1 for a vehicle, hidden from the outside by the first light shielding film 2, and hidden from the inside by the second light shielding film 3. . As shown in FIG. 5, the second bus bar 42 is divided into two second bus bar segments 421 and 422 in the thickness direction, and the first heating wire 51 is interposed between the two second bus bar segments 421 and 422. Hold the lower end in place. A solder layer etc. not shown is provided in the mutually opposing surface of the 2nd 2nd bus-line division piece 421, 422, and the lower end part of the 1st heating wire 51 is fixed by a solder layer.

  As shown in FIG. 4, the first bus bar 41 is connected to a first pole (e.g., a negative electrode) of the DC power supply 80 via a first lead bus bar 71. On the other hand, the second bus bar 42 is connected to the second pole (e.g., positive electrode) of the DC power supply 80 via the second lead bus bar 72. As a result, a voltage is applied to the first heating wire 51, a current flows through the first heating wire 51, and Joule heat is generated. As the first lead bus bar 71 and the second lead bus bar 72, copper, aluminum or the like is suitably used.

  In the present embodiment, the first pole of the direct current power source 80 is a negative pole, and the second pole of the direct current power source 80 is a positive pole, but may be reversed. That is, the first pole of the direct current power source 80 may be a positive pole, and the second pole of the direct current power source 80 may be a negative pole. Also, instead of the negative electrode of the DC power supply 80, a ground electrode may be used. A car body or the like is used as the ground electrode. It is sufficient if a voltage can be applied between the first bus 41 and the second bus 42.

  As shown in FIG. 4, a plurality of first heating wires 51 are provided at intervals in a second direction (for example, the vehicle width direction) orthogonal to the first direction. The plurality of first heating wires 51 are disposed substantially in parallel. The first heating wire 51 is formed in a straight line when it is separated, but may be formed in a wavy line when it is expanded.

  By the way, the plurality of first heating wires 51 are disposed substantially in parallel, and heat the rectangular first heating area 61. On the other hand, the laminated glass 1 for vehicles is usually formed in an equal leg trapezoidal shape. The lower side of the laminated glass 1 for a vehicle is longer than the upper side of the laminated glass 1 for a vehicle. Therefore, the stop position of the wiper set at the lower side portion of the laminated glass 1 for vehicles protrudes from the first heating area 61 in the second direction (more specifically, for example, the passenger seat side).

  Therefore, in the laminated glass 1 for a vehicle according to the present embodiment, a voltage is applied by the third bus bar 43 provided between the first bus bar 41 and the second bus bar 42, the third bus bar 43 and the second bus bar 42. It further has a second heating area 62 in which a second heating wire 52 is provided. The second heating area 62 and the first heating area 61 are arranged in the second direction. The second heating area 62 may be provided so as to overlap the portion of the wiper stopped at the stop position of the wiper from the first heating area 61, and may be provided on the passenger seat side with reference to the first heating area 61. Similar to the first bus bar 41 and the second bus bar 42, copper, aluminum or the like is preferably used as the third bus bar 43. Similar to the first heating wire 51, tungsten or the like is preferably used as the second heating wire 52.

  The second heating region 62 is provided with a second heating wire 52 that generates heat by applying a voltage from the second bus 42 and the third bus 43. The second heating wire 52 may electrically connect only the second bus 42 and the third bus 43 among the first bus 41, the second bus 42 and the third bus 43. The line width of the second heating wire 52 is narrower than the line width of the second bus 42 and the line width of the third bus 43.

  As shown in FIG. 4, the third bus bar 43 is provided on the lower side of the laminated glass 1 for a vehicle as in the second bus bar 42, and is hidden from the vehicle outer side by the first light shielding film 2. Is hidden from inside the car by As shown in FIG. 5, the third bus bar 43 is divided into two third bus bar segments 431 and 432 in the thickness direction, and the second heating wire 52 is interposed between the two third bus bus segments 431 and 432. Hold the upper end in place and secure. A solder layer etc. not shown is provided in the mutually opposing surface of the 2nd 3rd bus-line division piece 431,432, and the upper end part of the 2nd heating wire 52 is fixed by a solder layer. The lower end portion of the second heating wire 52 is sandwiched and fixed between the two second busbar segments 421 and 422. A solder layer etc. not shown is provided in the mutually opposing surface of two 2nd bus-line division | segmentation pieces 421 and 422, and the lower end part of the 2nd heating wire 52 is fixed by a solder layer.

  By the way, the third bus bar 43 of the present embodiment is provided across both the first heating area 61 and the second heating area 62, and is electrically connected to both the first heating wire 51 and the second heating wire 52. Ru. In this case, the first heating wire 51 extends from the second bus 42 to the first bus 41 via the third bus 43.

  A third bus bar 43 is provided between the first bus bar 41 and the second bus bar 42, and the first heating wire 51 electrically connecting the first bus bar 41 and the second bus bar 42 with the third bus bar 43 in the middle It crosses. Therefore, when a voltage is applied between the first bus bar 41 and the second bus bar 42 and a current flows through the first heating wire 51, the distance from the first bus bar 41 to the third bus bar 43 and the third bus bar 43 A potential corresponding to the ratio to the distance to the 2-bus 42 is generated in the third bus. The potential of the third bus 43 is intermediate between the potential of the first bus 41 and the potential of the second bus 42. A potential difference is generated between the first bus 41 and the third bus 43, and a potential difference is generated between the third bus 43 and the second bus 42. A current flows through the second heating wire 52 due to the potential difference between the third bus 43 and the second bus 42, and Joule heat is generated. The third bus bar 43 functions as an equipotential line, and applies the same voltage to the plurality of second heating wires 52.

  As shown in FIG. 4, a plurality of second heating wires 52 are provided at intervals in the second direction. The plurality of second heating wires 52 are disposed substantially in parallel. The second heating wire 52 is formed in a straight line when it is separated, but may be formed in a wavy line when it is expanded.

  As described above, the laminated glass 1 for a vehicle according to the present embodiment has the third bus bar 43 between the first bus bar 41 and the second bus bar 42 facing each other at an interval in the first direction. And a second heating area 62 aligned with the first heating area 61. The first heating region 61 is provided with a first heating wire 51 which generates a voltage by applying a voltage from the first bus 41 and the second bus 42. The second heating region 62 is provided with a second heating wire 52 that generates heat by applying a voltage from the second bus 42 and the third bus 43. By controlling the three potentials of the first bus bar 41, the second bus bar 42 and the third bus bar 43, it is possible to heat both the first heating area 61 and the second heating area 62, and the first heating area 61 and the second heating It is possible to heat the stop position of the wiper which spans both areas 62. Freezing at the stop position of the wiper can be prevented. Since the second bus 42 is used as a bus common to both the first heating wire 51 and the second heating wire 52, the number of buses can be reduced, and the wiring can be simplified.

  In addition, the third bus bar 43 of the present embodiment is provided across both the first heating area 61 and the second heating area 62, and is electrically connected to both the first heating wire 51 and the second heating wire 52. Ru. In this case, the first heating wire 51 extends from the second bus 42 to the first bus 41 via the third bus 43. Therefore, when a voltage is applied between the first bus bar 41 and the second bus bar 42 and a current flows through the first heating wire 51, the distance from the first bus bar 41 to the third bus bar 43 and the third bus bar 43 A potential corresponding to the ratio to the distance to the 2-bus 42 is generated in the third bus. The potential of the third bus 43 is intermediate between the potential of the first bus 41 and the potential of the second bus 42. Therefore, the third lead bus bar for applying a predetermined potential to the third bus bar 43 can be omitted, and the wiring can be further simplified.

  6 to 10 are views showing a method of manufacturing laminated glass for a vehicle according to an embodiment, and a view showing a method of fixing a first bus bar, a first heating wire, and the like to an intermediate film according to an embodiment.

  First, as shown in FIG. 6, on the surface of the intermediate film 30 (for example, the surface on the inner side of the vehicle), the first bus split pieces 411 and the second bus split pieces are spaced apart in the first direction (vertical direction in FIG. 6). 421 and the third busbar segment 431 are fixed. This fixing is performed by pressing the first bus divisions 411, the second bus divisions 421, and the third bus divisions 431 against the surface of the intermediate film 30 while heating.

  Then, as shown in FIG. 7, on the surface of the intermediate film 30, a plurality of first heating wires 51 arranged at intervals in the second direction (left and right direction in FIG. 7) and intervals in the second direction The plurality of second heating wires 52 aligned are fixed. This fixing is performed by pressing the first heating wire 51 and the second heating wire 52 against the surface of the intermediate film 30 while heating. Each first heating wire 51 and each second heating wire 52 extend in a first direction (vertical direction in FIG. 7).

  Next, as shown in FIG. 8, the first busbar segment 412 is fixed to the first busbar segment 411 fixed in advance to the intermediate film 30 with the first heating wire 51 interposed therebetween. A solder layer etc. not shown are provided in the mutually opposing surface of the two 1st bus-line division pieces 411 and 412, and the 1st heating wire 51 is fixed by a solder layer.

  Further, as shown in FIG. 8, the second busbar segment 422 is fixed to the second busbar segment 421 fixed in advance to the intermediate film 30 with the first heating wire 51 and the second heating wire 52 interposed therebetween. A solder layer etc. not shown is provided in the mutually opposing surface of the 2nd 2nd bus-line division piece 421, 422, and the 1st heating wire 51 and the 2nd heating wire 52 are fixed by a solder layer.

  Further, as shown in FIG. 8, the third busbar segment 432 is fixed to the third busbar segment 431 fixed in advance to the intermediate film 30 with the first heating wire 51 and the second heating wire 52 interposed therebetween. A solder layer etc. not shown is provided in the mutually opposing surface of the 2nd 3rd bus-line division piece 431,432, and the 1st heating wire 51 and the 2nd heating wire 52 are fixed by a solder layer.

  Next, as shown in FIG. 9, the surplus portion of the first heating wire 51 and the surplus portion of the second heating wire 52 are cut off.

  Finally, as shown in FIG. 10, the first lead bus bar 71 and the second lead bus bar 72 are fixed to the surface of the intermediate film 30 (for example, the surface on the inner side of the vehicle). This fixing is performed by pressing the first lead bus bar 71 and the second lead bus bar 72 against the surface of the intermediate film 30 while heating.

  Thereafter, the intermediate film 30 is subjected to the preparation of a polymer. The polymer is produced by sandwiching the intermediate film 30 shown in FIG. 10 between the first glass plate 10 provided with the first light shielding film 2 and the second glass plate 20 provided with the second light shielding film 3. The laminated glass 1 for vehicles is produced by pressurizing and heating the produced polymer with an autoclave etc.

  As mentioned above, although the embodiment etc. of the laminated glass for vehicles were described, the present invention is not limited to the above-mentioned embodiment etc., within the range of the gist of the present invention described in the claim, various modification, improvement It is possible.

  FIG. 11: is the front view which looked at the heating structure of the laminated glass for vehicles by a 1st modification from the vehicle outer side. In the above embodiment, the number of heating wires is large (see FIG. 4) between the third bus bar 43 and the second bus bar 42 as compared to between the first bus bar 41 and the third bus bar 43 (see FIG. 4). small. On the other hand, in the present modification, the number of heating wires is the same between the first bus 41 and the third bus 43 and between the third bus 43 and the second bus 42. The differences will be mainly described below.

  The third heating wire 53 shown in FIG. 11 is provided instead of a part of the first heating wire 51 shown in FIG. 4, and the first bus 41 and the first bus 41 of the first bus 41, the second bus 42 and the third bus 43 are provided. Only the third bus 43 is electrically connected. The third heating wire 53 is heated by applying a voltage by the first bus 41 and the third bus 43. As the third heating wire 53, tungsten or the like is suitably used as in the case of the first heating wire 51 and the second heating wire 52. The third heating wire 53 is formed shorter than the first heating wire 51 in the cutting process shown in FIG. The number of heating wires is the same between the first bus 41 and the third bus 43 and between the third bus 43 and the second bus 42, and the current value of each heating wire is the same. The number of heating wires between the first bus 41 and the third bus 43 and the number of heating wires between the third bus 43 and the second bus 42 may not be completely the same, and within the allowable range. It should be the same.

  In the embodiment and the first modification, the area on the first bus bar 41 side (upper side) with reference to the third bus bar 43 and the area on the second bus bar 42 side (lower side) with respect to the third bus bar 43 And at the same time, only one of them may be heated. In this case, the third bus bar 43 is connected to the DC power supply via a third lead bus bar or the like that applies a predetermined potential to the third bus bar 43. Similar to the first lead bus bar 71 and the second lead bus bar 72, copper, aluminum or the like is suitably used as the third lead bus bar.

  FIG. 12 is a front view of a heating structure of a laminated glass for a vehicle according to a second modification as viewed from the outer side of the vehicle. The third bus bar 43 of the above embodiment is provided across both the first heating area 61 and the second heating area 62, and is electrically connected to both the first heating wire 51 and the second heating wire 52. On the other hand, the third bus bar 43 of the present modification is provided only in the second heating region 62 of the first heating region 61 and the second heating region 62, and the first heating wire 51 and the second heating wire 52. It is electrically connected only to the second heating wire 52. According to this modification, since the third bus bar 43 is provided only in the second heating region 62 of the first heating region 61 and the second heating region 62, the third bus 43 can be formed short. The differences will be mainly described below.

  As shown in FIG. 12, in order to apply a predetermined potential to the third bus bar 43, the third bus bar 43 is connected to the DC power supply 80 via the third lead bus bar 73 and the like. For example, the third bus 43 is connected to the positive electrode of the DC power supply 80 via the third lead bus 73 and the step-down DC / DC converter 74 in order to provide a potential difference between the third bus 43 and the second bus 42. The step-down DC / DC converter 74 drops the output voltage compared to the input voltage. As the step-down DC / DC converter, a linear regulator, a step-down switching regulator or the like is suitably used.

DESCRIPTION OF SYMBOLS 1 Glass for vehicles 10 1st glass plate 20 2nd glass plate 30 Intermediate film 41 1st bus bar 42 2nd bus bar 43 3rd bus bar 51 1st heating wire 52 2nd heating wire 53 3rd heating wire 61 1st heating area 62 Second heating area

Claims (4)

A laminated glass for a vehicle, comprising: a first glass plate, a second glass plate opposed to the first glass plate, and an intermediate film bonding the first glass plate and the second glass plate,
A first bus bar and a second bus bar facing each other at intervals in the first direction between the first glass plate and the second glass plate, and a second bus bar provided between the first bus bar and the second bus bar And three heating lines, and a first heating area and a second heating area aligned in a second direction orthogonal to the first direction,
The first heating region is provided with a first heating wire that generates a heat by applying a voltage by the first bus and the second bus.
A laminated glass for a vehicle, in the second heating area, a second heating wire which generates a voltage by applying a voltage by the second bus and the third bus and generates heat.   The third bus bar is provided across both the first heating area and the second heating area, and is electrically connected to both the first heating wire and the second heating wire. The laminated glass for vehicles as described. In the first heating area, instead of a part of the first heating wire electrically connected to the first bus bar, the second bus bar, and the third bus bar, the first bus bar, the second bus bar, And a third heating wire electrically connected only to the first bus bar and the third bus bar among the third bus bars,
The laminated glass for a vehicle according to claim 2, wherein the third heating wire is heated by applying a voltage by the first bus and the third bus.   The third bus bar is provided only in the second heating area among the first heating area and the second heating area, and the electric power is supplied only to the second heating line among the first heating line and the second heating line. The laminated glass for a vehicle according to claim 1, wherein the laminated glass is connected to each other.

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