JP5501972B2 - Power supply structure for vehicle window glass, vehicle window glass, and method for manufacturing vehicle window glass - Google Patents

Description

  The present invention relates to a vehicle window glass feeding structure, a vehicle window glass, and a vehicle window glass manufacturing method, and more particularly to a vehicle window glass feed for supplying current to a conductor formed on an automobile window glass. The present invention relates to a structure, a vehicle window glass, and a method for manufacturing a vehicle window glass.

  In many cases, a rear glass or a side glass of a vehicle is provided with an anti-fogging heater for preventing the glass from fogging. Furthermore, some vehicles with a cold region specification are provided with a conductor (heating wire) for heating the glass near the standby position of the wiper blade in order to prevent the wiper blade provided in the windshield from freezing. . These antifogging and heating conductors are electrically conductively supplied with weak currents such as antennas for receiving radio waves of TV broadcast waves, radio waves of AM / FM broadcast waves, and broadband radio waves such as PHS. Compared with the body, a large current (1 A or more) is supplied.

  A feed point is formed on these conductors, and a terminal for energization is joined to the feed point. Thereby, an electric current is supplied from the power supply part by the side of a vehicle body via this terminal.

  In general, solder containing Pb, for example, Pb—Sn—Bi—Ag solder, has been used for joining a terminal to a feeding point. However, it takes time to process solder containing Pb at the time of disposal, and regulations on the use of solder containing Pb in various countries, such as the ELV (Discarded Vehicle) Directive and the WEEE & RoHS (Disposable Electrical and Electronic Equipment) Directive in Europe Therefore, there is a demand for a joining method other than soldering for joining the terminals of the vehicle window glass.

On the other hand, Patent Document 1 discloses a technique for joining a terminal to a feeding point using a solder containing a conductive component and a buffer component and not containing Pb. However, the glass plate to which this technology is applied is intended for tempered glass whose strength does not easily decrease even when a thermal shock is applied.
That is, when the technique of Patent Document 1 is applied to laminated glass that is formed by heat-pressing a plurality of unstrengthened glass plates through a resin intermediate film, a part of the glass plate to which solder is applied In addition, residual stress is generated due to thermal shock caused by high-temperature solder. For this reason, there existed a problem that the intensity | strength of the glass plate of a laminated glass fell and a glass plate was damaged. Therefore, the technique of Patent Document 1 cannot be applied to laminated glass that is a windshield of a vehicle.

WO 2006/016588 A1

  The present invention has been made in view of the above-described circumstances. A power supply structure for a vehicle window glass, a vehicle window glass, and a vehicle capable of satisfactorily bonding a terminal to a power supply point of a conductor without using solder. It aims at providing the manufacturing method of a window glass.

According to the present invention, in order to achieve the above object, a conductor is formed on a glass on the surface of the vehicle window glass, and a terminal ( In an electrical connection structure of a window glass for vehicles in which a terminal is connected and current is supplied to the conductor through the terminal, the terminal is 50-150 It is cured by heating to ° C., and is bonded to the feeding point by a conductive adhesive that exhibits conductivity and adhesion function, and is bonded to the terminal, and the vehicle window Provided is a vehicle window glass feeding structure, which is fixed to a vehicle window glass by an adhesive member having an adhesive portion with the glass.

  According to this invention, in order to achieve the said objective, the vehicle window glass feeding structure of this invention is mounted, The vehicle window glass characterized by the above-mentioned is provided.

  According to the present invention, in order to achieve the above object, a step of forming a conductor on the surface of the vehicle window glass, and a terminal and / or a conductive adhesive on the conductor at a feeding point of the conductor. The step of applying, the step of temporarily fixing the terminal and the conductor via a conductive adhesive, the step of fixing the terminal to a vehicle window glass with an adhesive member, and the conductive adhesive 50 to 50 Heating at a temperature of 150 ° C. for 10 minutes or more, and by heating, the conductive adhesive exhibits conductivity and an adhesive function, and is bonded by the conductive adhesive, and by the adhesive member, the terminal Is fixed to the window glass for vehicles, and the manufacturing method of the window glass for vehicles is provided.

  According to the present invention, the bonding of the terminal with the conductive adhesive is performed instead of the bonding with the solder. This conductive adhesive is cured by heating to 50 to 150 ° C., and has the property of exhibiting electrical conductivity and an adhesive function. That is, the vehicle window glass of the present invention first forms a conductor on the surface of the vehicle window glass, then temporarily holds the terminal at the power feeding point of the conductor with the conductive adhesive, The terminal is fixed to the vehicle window glass by an adhesive member, and then the vehicle window glass is heated at a temperature of 50 to 150 ° C. for 10 minutes or more to cure the conductive adhesive.

  The adhesive member is intended to reinforce the adhesive strength of the conductive adhesive and hold the terminal until it is cured, and the adhesive performance does not deteriorate even when heated at a temperature of 50 to 150 ° C. for 10 minutes or more. Is preferred. Although the well-known resin which satisfy | fills the above-mentioned conditions can be used for the said adhesive member, a thermoplastic resin can be used suitably. Examples of the thermoplastic curable resin include an adhesive tape of acrylic resin or ethylene vinyl acetate (EVA) resin, and an adhesive tape or film of a laminate of polyethylene terephthalate (PET) resin and EVA resin. Thereby, a terminal can be adhere | attached with sufficient adhesive force to a feeding point.

  As described above, according to the present invention, it is possible to satisfactorily adhere the terminal to the feeding point of the conductor without using solder, and it is possible to favorably adhere the terminal to the feeding point of the conductor without using solder. A vehicle window glass can be provided.

  Tempered glass and laminated glass can be applied as the vehicle window glass of the present invention. In the case of tempered glass, the number of steps for heating the conductive adhesive is increased in the manufacturing process, but in the case of laminated glass, in the step of thermocompression bonding of two glass plates through an intermediate film, conductive bonding is performed. The agent can be heated. For this reason, there exists an advantage that it can manufacture, without increasing a manufacturing process.

  According to the present invention, the conductive adhesive contains an epoxy resin that is liquid at room temperature, a phenol resin that is liquid at room temperature, a reactive diluent, an imidazole compound, and silver powder and / or silver-coated metal powder. Preferably, it is a one-component solvent-free conductive adhesive. In the present invention, an adhesive is a general-purpose adhesive that permanently exhibits adhesive performance, an adhesive (pressure-sensitive adhesive) having removability, and a viscosity that exhibits adhesive properties at the time of adhesion. Including adhesives. Moreover, room temperature shall refer to 10-40 degreeC. In addition, an epoxy resin that is liquid at room temperature (hereinafter also simply referred to as “epoxy resin”) used for the conductive adhesive in the present invention is contained in the conductive adhesive as a binder.

The epoxy resin that is liquid at room temperature used for the conductive adhesive in the present invention reacts with a liquid phenol resin or the like at room temperature to be described later to form a cured product, and the cured product is a conductive metal particle responsible for conductivity ( Acts as a binder for conductive metal particles).
Such epoxy resins generally have a rigid structure having an aromatic ring and are bisphenol F type epoxy resins, bisphenol A type epoxy resins, urethane modified epoxy resins, rubber modified epoxy resins, naphthalene type epoxy resins, phenols. Examples include novolak epoxy resins, dimer acid-modified epoxy resins, and phthalate ester epoxy resins. These epoxy resins may be used alone or in combination of two or more.

  The content of the epoxy resin is preferably 2 to 10% by mass and more preferably 3 to 8% by mass in 100% by mass of the conductive adhesive. When the content of the epoxy resin is smaller than the above value, the adhesive strength becomes weak and it becomes difficult to function as an adhesive. On the other hand, when the content is larger than the above value, the connection of the silver powder and / or the silver-coated metal powder is deteriorated, and it may be difficult to obtain conductivity.

  The phenol resin that is liquid at room temperature (hereinafter also referred to as “liquid phenol resin”) used for the conductive adhesive in the present invention is contained in the conductive adhesive as a curing agent for the epoxy resin. Since the liquid phenol resin is easily mixed with other components, the content of the reactive diluent described later can be reduced. As a result, the adhesive strength of the cured product obtained by curing the conductive adhesive can be improved. Moreover, a conductive adhesive can be made into a solventless type adhesive by using a liquid phenol resin. Examples of such a liquid phenol resin include a liquid novolac type phenol resin.

  The content of the liquid phenol resin is preferably 2 to 10% by mass and more preferably 3 to 8% by mass in 100% by mass of the conductive adhesive. When content of said liquid phenol resin becomes smaller than the said value, it will become impossible to fully raise the adhesive strength of a conductive adhesive. On the other hand, when the content is larger than the above value, the electrical resistance under high temperature and high humidity or heat cycle increases.

Moreover, it is preferable that said liquid phenol resin is 50-250 mass parts with respect to 100 mass parts of said epoxy resins, More preferably, it is 80-150 mass parts. If the content of the above-mentioned liquid phenol resin with respect to the epoxy resin is within the above range, the balance between the content of the epoxy resin (main agent) and the above-mentioned liquid phenol resin (curing agent) becomes good, and the conductive adhesive is cured. In addition, in the conductive adhesive in the present invention, the liquid phenol resin contains one or more types of phenol resins that are solid at room temperature within a range that does not impair the characteristics of the liquid phenol resin. You may let them. Examples of the phenol resin solid at room temperature include cresol novolac resin, dicyclopentadiene phenol resin, terpene phenol resin, triphenolmethane resin, and phenol aralkyl resin. The content of the phenol resin solid at room temperature is preferably 20 parts by mass or less with respect to 100 parts by mass of the liquid phenol resin.

  The reactive diluent in the present invention is an aliphatic compound having a plurality of glycidyl groups or a compound having one glycidyl group and an aromatic ring, and is a liquid compound at room temperature.

  As will be described later, since the conductive adhesive in the present invention contains a large amount of conductive metal particles for developing conductivity, the dispersion state of the conductive metal particles can be improved by using a reactive diluent. Moreover, since the viscosity of a conductive adhesive can be adjusted appropriately, handling property and workability are improved.

  Moreover, since the reactive diluent has a glycidyl group, it can react with the phenol resin. Therefore, it is taken into a part of the cured product when the conductive adhesive is cured, and becomes a binder for the conductive metal particles.

  Whereas the epoxy resin has a relatively rigid structure, the reactive diluent is a cured product obtained by curing the conductive adhesive by having a flexible structure or having only one glycidyl group. Give flexibility. Therefore, by using the epoxy resin and the reactive diluent together, and adjusting the blending ratio of the epoxy resin and the reactive diluent, the hardness, elasticity, etc. of the cured product obtained by curing the conductive adhesive are adequate. Can be adjusted.

  Examples of reactive diluents include glycidyl orthotoluidine, ethylene glycol diglycidyl ether, 2-ethylhexyl glycidyl ether, glycidyl methacrylate, cyclohexane dimethanol diglycidyl ether, trimethylolpropane triglycidyl ether, neopentyl glycol diglycidyl ether, phenyl glycidyl ether. Examples include ether, polyethylene glycol diglycidyl ether, and polypropylene glycol diglycidyl ether. These reactive diluents may be used alone or in combination of two or more.

  The content of the reactive diluent is preferably 2 to 10% by mass and more preferably 3 to 8% by mass in 100% by mass of the conductive adhesive. When content of a reactive diluent becomes smaller than the said value, the viscosity at the time of setting it as a conductive adhesive will become high too much, and the dispersibility of the silver powder and / or silver coat metal powder which are mentioned later falls. As a result, the conductive adhesive is difficult to apply, and workability is reduced. On the other hand, when the content is larger than the above value, the cured product of the adhesive becomes brittle and the adhesive strength is lowered.

  The imidazole compound in the present invention is contained in a conductive adhesive as a curing accelerator. When the imidazole compound is contained, the curability of the conductive adhesive becomes good, and as a result, the heat resistance of the cured product is improved. Examples of such imidazole compounds include 2-phenylimidazole, 2-undecylimidazole, 2-phenyl-4, 5-dihydroxymethylimidazole, 2-phenyl-4-methyl-5-hydroxymethylimidazole, 4, 4′- Examples include imidazole-based epoxy curing accelerators such as methylenebis (2-ethyl-methylimidazole) and 2-heptadecylimidazole. These imidazole compounds may be used alone or in combination of two or more.

  The content of the imidazole compound is preferably 0.5 to 5% by mass and more preferably 1 to 4% by mass in 100% by mass of the conductive adhesive. When content of an imidazole compound becomes smaller than the said value, sclerosis | hardenability will fall. On the other hand, when the content is larger than the above value, the reactivity becomes faster and the storage stability becomes worse.

  As the conductive metal particles, it is preferable to use at least one of silver powder and silver-coated metal powder. As a silver coat metal powder, the silver plating copper powder which silver-plated copper powder, the silver plating nickel powder which silver-plated nickel powder, etc. can be used, for example. The silver powder and the silver-coated metal powder may have a substantially spherical shape or a flake shape, but a flake shape is preferred. The 50% diameter by Microtrack is preferably 1 to 20 μm, and more preferably 3 to 15 μm, from the viewpoint of conductivity. The content of the silver powder and / or the silver-coated metal powder is preferably 100% by mass and 70 to 92% by mass, and more preferably 75 to 90% by mass. When content of silver powder and / or silver coat metal powder becomes smaller than the said value, the connection of silver powder and / or silver coat metal powder will worsen, and it will become difficult to obtain electroconductivity. On the other hand, when the content is larger than the above value, the adhesive strength becomes weak and the cost increases more than necessary. As conductive metal particles, in addition to silver powder and / or silver-coated metal powder, other particles such as nickel powder and copper powder are used in combination as long as the properties such as adhesion and conductivity are not impaired. Also good.

The mass ratio (solid content ratio) of the silver powder and / or silver-coated metal powder and the resin component (that is, the total of the epoxy resin and the liquid phenol resin) is: silver powder and / or silver-coated metal powder: resin component = 80: 20-96: 4 is preferable and 85: 15-93: 7 is more preferable.
If the mass ratio of the silver powder and / or the silver-coated metal powder and the resin component is within the above range, the cured product obtained from the conductive adhesive is a cured product excellent in both conductivity and adhesive strength.

  The conductive adhesive in the present invention can be prepared by mixing the above-described components with a roll mill or the like. Thereby, it can harden | cure at 50-150 degreeC, Preferably it is 80-130 degreeC, and can provide the conductive adhesive which exhibits electroconductivity and an adhesive function.

According to the present invention, the conductive metal particles preferably contain at least one of silver powder and silver-coated metal powder obtained by silver plating the metal powder. According to the present invention, it is preferable that the terminal and the adhesive member are sealed to the vehicle window glass by a waterproof member. Specifically, a primer is applied to the glass plate side to which the terminal and the adhesive member are attached, and a silicone sealant as a sealing material is placed. This silicone sealant cures at room temperature in 5 hours to 5 days. Thereby, the waterproofness of a feeding point, a terminal, and an adhesive member improves. It can also be sealed with a thermosetting resin such as a hot melt adhesive.

  According to the present invention, the current value supplied to the terminal can be set to 1 to 30 A, and the electrical resistance value between the current-carrying side of the terminal and the conductor bonded to the power-feeding point is 100 mΩ or less. It is preferable that This is because it is possible to secure current for energizing the power feeding portion to obtain anti-fogging and desired heating performance, and at the same time to prevent heating of the power feeding point and ensure adhesive strength and conductivity.

  According to the present invention, it is preferable that the temperature of the terminal when a current of 10 A is supplied to the terminal for 30 minutes is 80 ° C. or less, and the adhesive strength of the terminal to the feeding point is 79 N or more.

  In general, an antifogging heater is formed on a rear glass of a vehicle using tempered glass. On the other hand, laminated glass is mainly applied to a windshield of a vehicle, and a conductor as a heating wire for heating a wiper blade may be formed on the windshield in addition to antifogging. Since these heating hot wires are supplied with a large current as compared with a conductor to which a weak current such as an antenna is supplied, the temperature of the terminal rises due to the electrical resistance between the terminal and the feeding point. If the temperature rise of this terminal is not suppressed, the glass plate itself may be subjected to a thermal shock and adversely affect circuit components and resin components arranged in the vicinity thereof. For this reason, a certain evaluation standard is set for the temperature rise of the terminal. The evaluation standard is that the temperature of the terminal is 80 ° C. or less when a current of 10 A is supplied to the terminal for 30 minutes. In order to achieve the temperature (80 ° C. or lower), it is preferable that the electrical resistance value between the current-carrying side of the terminal and the conductor bonded to the feeding point is 100 mΩ or lower. In consideration of the size of the circuit and the amount of heat generated, the current value supplied to the laminated glass using the unstrengthened glass plate is preferably set to 1 to 10 A, and in the case of tempered glass, it is set to 10 to 30 A. It is preferable to do.

  On the other hand, the adhesive strength is the tensile strength of the terminal, and is the tensile strength when the terminal is pulled away from the feeding point by pulling the terminal in the in-glass direction. Specifically, the terminal with the conductive adhesive cured is pulled in the in-plane direction of the glass plate via a push-pull gauge, and the value when the terminal peels from the feeding point is a value measured with the push-pull gauge. is there. As this evaluation standard, it is set as 79 N or more, and the feeding structure of the vehicle window glass of the present invention can exceed the evaluation standard.

According to this invention, it is preferable that the breaking strength by the measuring method by the strain gauge near the feeding point of the said window glass for vehicles is 60 Mpa or more. Specifically, the weight is dropped on the back surface of the vehicle window glass feeding structure, and the breaking strength is evaluated from the falling height of the weight when the vehicle window glass is broken. The vehicle window glass feeding structure of the present invention can exceed the evaluation standard. According to the present invention, it is preferable that the adhesive member is made of an acrylic or ethylene vinyl acetate thermoplastic resin. According to the present invention, it is preferable that the vehicle window glass is a laminated glass made of a resin intermediate film sandwiched between a plurality of plate glasses. According to this invention, in order to achieve the said objective, the window glass for vehicles provided with the electric power feeding structure of the said window glass for vehicles is provided. According to the present invention, in order to achieve the above object, a step of forming a conductor on the surface of the window glass for a vehicle, a feeding point formed on the conductor, and a contact of a terminal bonded to the feeding point A step of applying a conductive adhesive to at least one of the surfaces; a step of temporarily holding the terminal and the conductor via a conductive adhesive; and a bonding portion between the terminal and the terminal; and A step of fixing to the vehicle window glass by an adhesive member having an adhesive portion with the vehicle window glass, and a step of heating the conductive adhesive at a temperature of 50 to 150 ° C. for 10 minutes or more. A vehicle window glass characterized in that a conductive adhesive exhibits conductivity and an adhesive function, and is bonded by the conductive adhesive and the terminal is fixed to the vehicle window glass by the adhesive member. Provide manufacturing method .

  According to the vehicle window glass power feeding structure and the vehicle window glass manufacturing method according to the present invention, the terminal can be satisfactorily bonded to the power feeding point of the conductor without using solder, and solder is used. The window glass for vehicles in which the terminal is satisfactorily bonded to the power feeding point of the conductor can be provided. As a result, in the present invention, since solder containing Pb or oxidizing flux used for soldering is not used, it can be mounted without using harmful substances, and VOC (volatile organic compounds) can be mounted during or during mounting. ) Can be realized, and an environmentally friendly terminal mounting structure can be realized.

It is a top view of the windshield to which the window glass for vehicles of embodiment was applied. It is sectional drawing which follows the AA line of FIG. It is the perspective view which showed the electric power feeding structure of the windshield of embodiment. It is explanatory drawing which showed the manufacturing process of the windshield of embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a vehicle window glass feeding structure, a vehicle window glass, and a vehicle window glass manufacturing method according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a plan view of a vehicle windshield (hereinafter abbreviated as “windshield”) 10 to which the vehicle window glass of the embodiment is applied, and FIG. 2 is a cross section taken along the line AA of FIG. It is a figure and is an expanded sectional view showing the electric supply structure of an embodiment. In addition, in embodiment, although the windshield 10 which is a laminated glass is illustrated as a window glass for vehicles, it is not limited to a windshield, It can apply also to a rear glass, a side glass, a roof glass, etc. Moreover, the glass plate is not limited to laminated glass, and is composed of a glass plate (so-called semi-tempered glass) designed to have a lower puncture strength of tempered glass or glass than general tempered glass. The present invention can also be applied to glass with a film to which a film or the like is attached (so-called bilayer glass). Moreover, even if the power feeding structure of the present invention is applied to a tempered glass having a sufficiently high breaking strength in the vicinity of the power feeding point, the effects of the present invention such as reduction of harmful substances and VOC are not impaired.

  As thickness of one plate glass used for this invention, 1-6 mm is desirable as a glass substrate used for glass for vehicles. Furthermore, if it is 1-2.3 mm, it is suitable as a board | substrate for laminated glasses for vehicles, and if it is 1.8 mm or less, it will contribute also to the weight reduction of laminated glass. If it is 2.3-6 mm, it can be applied as a substrate of tempered glass, and the breaking strength in the vicinity of the feeding point can be easily maintained. Furthermore, if it is 2.5-3.5 mm, it can manufacture with the tempered glass manufacturing apparatus for general purpose vehicles, and it is advantageous in cost. Moreover, if it is 3 mm or less, the contribution to the weight reduction of tempered glass is large.

  As shown in FIG. 1, a shielding layer 12 called a “black sera” is formed in a band shape around the windshield 10. The shielding layer 12 is formed, for example, by applying black sera printing ink on a glass surface and baking it. The shielding layer 12 forms a black opaque layer around the windshield 10. The black opaque layer prevents deterioration of the urethane sealant holding the windshield 10 in the vicinity thereof due to ultraviolet rays, and also the windshield 10. The feeding point 16 and the terminal 18 shown in FIG. 2 of the conductor 14 attached around the shield 10 cannot be seen through from the outside of the vehicle.

  Although the shielding layer 12 is omitted in FIG. 2, the shielding layer 12 is formed in the periphery of the glass plate 20 outside the vehicle constituting the windshield 10, and the conductor 14 is formed on the surface layer of the shielding layer 12. Is formed. The conductor 14 is a heating wire that heats a wiper blade (not shown) of the windshield 10, and a large current (1 A or more) is supplied from a battery that is a power supply unit on the vehicle body side. In addition, the conductor 14 is formed by applying a conductive silver paste on the shielding layer 12 by screen printing or applying a conductive toner by electronic printing, and then baking.

In FIG. 2, reference numeral 22 denotes a glass plate inside the vehicle constituting the windshield 10, and the glass plate 22 and the glass plate 20 are formed by sandwiching an intermediate film 24 made of a resin such as PVB (polyvinyl butyral resin). Is done. The laminated body of the glass plate 22 and the intermediate film 24 is comprised in the laminated glass which is the windshield 10 by carrying out thermocompression bonding (heating conditions: 130 degreeC, 15 minutes) with an autoclave apparatus.
Reference numeral 26 denotes a conductive adhesive (described later) for bonding the terminal 18 to the feeding point 16, and reference numeral 28 denotes an adhesive tape (adhesive member) for bonding the terminal 18 to the glass plate 20. Is a silicone sealant (waterproofing member) that seals the terminal 18 and the adhesive tape 28. This silicone sealant 30 is formed to expose the arc-shaped cutout 23 formed in advance on the glass plate 22 on the vehicle interior side shown in FIG. 3, that is, the feeding point 16 formed on the glass plate 20 on the vehicle exterior side. Bonded so as to fill the notch 23. Thereby, since the feeding point 16, the terminal 18, and the adhesive tape 28 are sealed by the silicone sealant 30, the feeding point 16, the terminal 18 and the adhesive tape 28 are concealed, and the waterproofness of the feeding structure is improved.

  On the other hand, the conductive adhesive 26 of the embodiment has a characteristic that it is cured by heating to 50 to 150 ° C. and exhibits conductivity and an adhesive function.

  FIG. 4 shows a manufacturing process of the windshield 10.

  According to this manufacturing process, first, the glass plate 20 (22) that has been cut into the size of the windshield 10 and before bending is cleaned by the cleaning unit 32. Note that the notch 23 has already been formed on the glass plate 22 inside the vehicle at this point.

  Next, the cleaned glass plate 20 (22) is carried into a bending furnace 34 where the glass plate 20 (22) is heated to a temperature at which bending can be performed, and the curved surface of the windshield is pressed by a press device or by its own weight. Bend to a curvature along The glass layer 20 on the outside of the vehicle is pre-coated with the shielding layer 12 and the conductor 14 before bending, and the shielding layer 12 and the conductor 14 are baked onto the glass plate 20 by the heat of the bending furnace 34. It is done.

  Next, the bent glass plate 20 (22) is cleaned by the cleaning unit 36, and then, in the intermediate film insertion unit 38, the glass plate 22 on the vehicle inner side is connected to the glass plate 22 on the vehicle outer side via the intermediate film 24. Overlapping. Thereby, the feeding point 16 is exposed from the notch 23 of the glass plate 22 inside the vehicle.

  Then, in a pre-process of the thermocompression bonding process by the autoclave device 40, the terminal 18 is bonded to the feeding point 16 with the conductive adhesive 26, and the terminal 18 is bonded to the glass plate 20 with the adhesive tape 28. In this state, the glass plate 20 and the glass plate 22 sandwiching the intermediate film 24 are carried into the autoclave device 40 and thermocompression bonded under heating conditions of 130 ° C. for 15 minutes. Thereby, while the windshield 10 which is a laminated glass is manufactured, the conductive adhesive 26 hardens | cures with the heat | fever of an autoclave apparatus, and an electroconductivity and an adhesive function are exhibited.

  Then, in the next step, a primer is applied to the surface of the adhesive tape 28, and a silicone sealant 30 is placed thereon so as to fill the concave portion of the notch 23. This silicone sealant 30 cures at room temperature in 24 hours. Thereby, the waterproofness of the feeding point 16, the terminal 18, and the adhesive tape 28 is improved.

  The pressure-sensitive adhesive tape 28 is intended to reinforce the adhesive force of the conductive adhesive 26 and hold the terminal 18 until it is cured, and its performance does not deteriorate even when heated at a temperature of 50 to 150 ° C. for 10 minutes or more. An acrylic resin tape, for example, trade name “J-7710” manufactured by Soken Chemical Co., Ltd. can be exemplified. Thereby, the terminal 18 can be bonded to the feeding point 16 with a sufficient adhesive force.

  Therefore, according to the power supply structure of the embodiment, the terminal 18 can be satisfactorily bonded to the power supply point 16 of the conductor 14 without using solder. Further, it is possible to provide the windshield 10 in which the terminal 18 is favorably bonded to the feeding point 16 without using solder.

  The conductive adhesive 26 according to the embodiment includes 4 parts by mass of a bisphenol F type epoxy resin (manufactured by Japan Epoxy Resin Co., “Ep806”) as a liquid epoxy resin at room temperature, and a liquid novolac type phenol as a liquid phenol resin at room temperature. 4 parts by mass of resin (Maywa Kasei Co., Ltd., “MEH8005”), 3 parts by mass of glycidyl orthotoluidine (Nippon Kayaku Co., Ltd., “GOT”) as a reactive diluent, and imidazole compound as an imidazole compound (curing accelerator) 2 parts by mass of an epoxy curing accelerator (manufactured by Shikoku Kasei Kogyo Co., Ltd., “2PZ”) and 50 parts by mass of flake silver powder (manufactured by Fukuda Metal Foil Co., Ltd., “AgC-GS”) as conductive metal particles, These materials are obtained by mixing with a roll mill.

  Thereby, the conductive adhesive which hardens | cures by heating to 50-150 degreeC, and exhibits an electroconductivity and an adhesive function can be provided.

  In the embodiment of the present invention, the current value fed to the terminal 18 is 1 to 30 A, and the electrical resistance value between the terminal 18 and the feeding point 16, that is, the electric power of the cured conductive adhesive 26. The resistance value is preferably 100 mΩ or less.

At this time, the current value is a set value of the DC power supply (manufactured by Takasago Seisakusho). The bonding area of the terminal at this time was 4 mm square (16 mm ² ), and the thickness of the conductive adhesive was fixed to be 0.1 to 0.3 mm. In addition, the electrical resistance value is measured as a resistance value of the power supply structure by a value between the power supply line bonded to the power supply side of the terminal and the conductor bonded to the power supply point. The electrical resistance value can be measured by a known method. Here, the electrical resistance value was measured by a milliohm high tester (manufactured by Hioki Engineering Service Co., Ltd.).

  Furthermore, the temperature of the terminal 18 when a current of 10 A is supplied to the terminal 18 for 30 minutes is 80 ° C. or less, and the adhesive strength of the terminal 18 to the feeding point 16 is preferably 79 N or more, more preferably 120 N or more. is there.

  Since the conductor 14 of the embodiment is supplied with a larger current than a conductor such as an antenna to which a weak current is supplied, the terminal 18 rises due to the electrical resistance between the terminal 18 and the feeding point 16. Warm up. If the temperature rise of the terminal 18 is not suppressed, the glass plate 20 and the glass plate 22 themselves may be subjected to a thermal shock and may adversely affect circuit components and resin components disposed in the vicinity thereof. A certain evaluation standard is set. The evaluation standard is that the temperature of the terminal is 80 ° C. or less when a current of 10 A is supplied to the terminal for 30 minutes. In order to achieve the temperature (80 ° C. or lower), the electrical resistance value between the terminal and the feeding point is preferably 100 mΩ or less, and more preferably 50 mΩ or less.

  According to the power supply structure of the embodiment, the temperature of the terminal 18 when 10 A was supplied to the terminal 18 for 30 minutes was 50 ° C., which satisfied the evaluation criteria.

  In consideration of thermal shock, the current value supplied to the laminated glass is preferably 1 to 10A, and in the case of tempered glass, it is preferably 10 to 30A.

  On the other hand, the adhesive strength is the tensile strength of the terminal 18 and is the tensile strength when the terminal 18 is peeled from the power supply point 16 when the terminal 18 is pulled in the in-glass direction with respect to the power supply point 16.

Specifically, the terminal 18 having the conductive adhesive 26 hardened is pulled in the in-plane direction of the glass plate 20 through a push-pull gauge, and the numerical value when the terminal 18 is peeled off from the feeding point 16 is obtained by the push-pull gauge. It is a measured value. The bonding area of the terminal at this time was 4 mm square (16 mm ² ), and the thickness of the conductive adhesive was fixed to be 0.1 to 0.3 mm. As this evaluation standard, it was set that the adhesive strength was 79 N or more, and the power feeding structure of the embodiment was 160 N, which satisfied the evaluation standard.
As another aspect, instead of acrylic resin tape, using EVA resin film (for example, Bridgestone's product name: EVA SAFE), other specifications are the same as the tensile strength of the terminal 180N, which satisfies the evaluation criteria.

  Moreover, it is preferable that the breaking strength measured by a strain gauge near the feeding point of the windshield 10 is 60 MPa or more. Specifically, a glass plate 20 with a strain gauge attached in the vicinity of the terminal attachment portion on the side (vehicle interior) to which the terminal 18 of the glass plate 20 is bonded is prepared, and the surface with the strain gauge attached is directed downward. Support horizontally. Next, a rubber hammer is set in the vertical direction in the vicinity of the terminal mounting portion of the glass plate 20, and near the terminal mounting portion on the surface (vehicle outer side) on the side where the terminals 18 of the glass plate 20 are not bonded from a predetermined height. Let it fall freely. The stress input from the strain gauge value after dropping is read, and the strength at which the glass plate 20 is broken is taken as the breaking strength.

  In the present invention, the vicinity of the feeding point refers to a range measured by the following evaluation method. Specifically, the weight is dropped on the back side of the power feeding structure portion of the windshield 10, and the breaking strength is evaluated from the falling height of the weight when the windshield 10 is broken. The breaking strength of the windshield 10 of the embodiment was 70 MPa, which satisfied the evaluation criteria.

The vehicle window glass feeding structure and the vehicle window glass manufacturing method of the present invention can satisfactorily bond the terminal to the power feeding point of the conductor without using solder, and the terminal to the power feeding point of the conductor. The present invention is industrially useful in that it can provide a vehicle window glass that is well bonded.
The entire contents of the specification, claims, drawings, and abstract of Japanese Patent Application No. 2008-239257 filed on September 18, 2008 are cited here as disclosure of the specification of the present invention. Incorporated.

  DESCRIPTION OF SYMBOLS 10 ... Wind shield, 12 ... Shielding layer, 14 ... Conductor, 16 ... Feeding point, 18 ... Terminal, 20 ... Glass plate outside the vehicle, 22 ... Glass plate inside the vehicle, 23 ... Notch, 24 ... Intermediate film, DESCRIPTION OF SYMBOLS 26 ... Conductive adhesive agent, 28 ... Adhesive tape, 30 ... Silicone sealant, 32 ... Cleaning part, 34 ... Bending molding furnace, 36 ... Cleaning part, 38 ... Intermediate film insertion part, 40 ... Autoclave apparatus

Claims (11)

In a vehicle window glass feeding structure in which a conductor is formed on a surface of a vehicle window glass, a terminal is connected to a feeding point of the conductor, and current is supplied to the conductor through the terminal. ,
The terminal is cured by heating to 50 to 150 ° C., and is adhered to the feeding point by a conductive adhesive that exhibits electrical conductivity and an adhesive function, and an adhesive portion with the terminal, and the vehicle window feed structure of the window glass for vehicles, characterized in that it is fixed to a vehicle glazing by adhesive member having an adhesive portion of the glass.   The conductive adhesive is a one-component solventless conductive adhesive containing an epoxy resin that is liquid at room temperature, a phenol resin that is liquid at room temperature, a reactive diluent, an imidazole compound, and conductive metal particles. The power supply structure for a vehicle window glass according to claim 1. 3. The vehicle window glass feeding structure according to claim 2, wherein the conductive metal particles contain at least one of silver powder and silver-coated metal powder obtained by applying silver plating to the metal powder. The terminal, and the adhesive member, the feeding structure of a vehicle glazing according to claim 1, 2 or 3 which is sealed to the window glass for the vehicle by the waterproof member. The electric power value of the electric power supplied to the said terminal is 1-30A, and the electrical resistance value between the said terminal and the said electric power feeding point is 100 m (ohm) or less, The electric power feeding of the window glass for vehicles in any one of Claims 1-4 Construction. The vehicle according to any one of claims 1 to 4 , wherein a temperature of the terminal when a current of 10A is supplied to the terminal for 30 minutes is 80 ° C or less, and an adhesive strength of the terminal to the feeding point is 79N or more. Window glass feeding structure. The power supply structure for a vehicle window glass according to any one of claims 1 to 6 , wherein a breaking strength measured by a strain gauge near a power supply point of the vehicle window glass is 60 MPa or more. The feed structure for a vehicle window glass according to any one of claims 1 to 7 , wherein the adhesive member is made of an acrylic or ethylene vinyl acetate thermoplastic resin. The vehicle window glass feeding structure according to any one of claims 1 to 8 , wherein the vehicle window glass is a laminated glass made of a resin intermediate film sandwiched between a plurality of plate glasses. Vehicle glazing, characterized in that it comprises a feed structure of the window glass for vehicles according to any one of claims 1-9. Forming a conductor on the surface of the window glass for a vehicle;
A step of applying conductive adhesive on at least one of the contact surfaces of the terminals to be bonded to said feeding point formed on conductor及beauty supply electric point,
Temporarily holding the terminal and the conductor via a conductive adhesive;
Fixing the terminal to the vehicle window glass by an adhesive member having an adhesive part with the terminal and an adhesive part with the vehicle window glass;
Heating the conductive adhesive at a temperature of 50 to 150 ° C. for 10 minutes or more;
The conductive adhesive exhibits conductivity and an adhesive function by heating, and is bonded by the conductive adhesive and the terminal is fixed to the vehicle window glass by the adhesive member. Manufacturing method of vehicle window glass.

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