JPS63173747A - Windshield glass for vehicle - Google Patents

Abstract

PURPOSE:To transmit heat generated with a heating wire to an outer plate efficiently by providing a heat reflection layer opposite to the heating wire between an inner plate and an intermediate layer in a windshield glass having the heating wire built into at the lower end thereof. CONSTITUTION:A windshield glass 10 comprising an outer plate 26 and an inner plate 28 bonded via an intermediate layer 30 has a printed heating coil 34 between the outer plate 26 and the intermediate layer 30 at the lower end thereof via a ceramic print 32 as an opaque heat transfer layer. Also, a heat reflection layer 36 comprising an aluminium film is arranged as opposite to the printed heating coil 34 between the intermediate layer 30 and the inner plate 28. And when snow, ice and the like are adhering to the storage part 18 of a wiper blade 16, the printed heating coil 34 is energized and generated heat is transferred to the outer plate 26 via the ceramic print 32 and heat transmitted through the intermediate layer 30 is reflected on the aluminium film 36 and transmitted outside. According to the aforesaid constitution, heat generated at the heating wire can be efficiently transmitted to the outer plate 26.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a vehicle windshield glass in which heating wires are embedded inside a laminated glass in which an outer panel and an inner panel are bonded via an interlayer film. .

[Conventional technology]

A technique in which this type of laminated glass is used as a front windshield glass disposed in the front window of a vehicle is known from Japanese Patent Laid-Open No. 136639/1983.

This windshield glass is used in a vehicle equipped with a concealed wiper in which the wiper is concealed and stored, and the heating wire is arranged at the lower end of the windshield glass so as to face the wiper blade when it is stored. ! The heating wire is placed inside the outer panel through an opaque heat transfer layer made of black ceramic or the like, and is sandwiched between the outer panel and the intermediate film.

With this configuration, the outer panel is heated through the heat transfer layer, melting accumulated snow around the wiper blade position when stored, and preventing wiper malfunction.

However, in this type of conventional vehicle windshield glass, the heat that passes through the interlayer film is also transferred to the inner plate, which is a good heat conductor, so the amount of heat transferred to the outer plate decreases. There was a drawback.

[Problem that the invention seeks to solve]

In view of the above facts, it is an object of the present invention to provide a windshield glass for a vehicle that is capable of efficiently transmitting heat generated by a heating wire to an outer panel.

[Means for solving problems]

The present invention provides a vehicle window in which an outer panel and an inner panel are coupled via an interlayer film, and an opaque heat transfer layer and a heating wire are arranged between the outer panel and the interlayer film at the lower end in order from the outer panel side. The shield glass has a structure in which a heat reflective layer is provided between the inner plate and the intermediate film, facing the heating wire.

[Effect]

In the present invention having the above configuration, the heat transmitted through the intermediate film is reflected by the heat reflection layer and transmitted to the outer panel via the opaque heat transfer layer, and the amount of heat transmitted to the inner panel is significantly reduced.

[Embodiment] FIGS. 1 to 3 show an embodiment of a vehicle windshield glass according to the present invention, which is attached to a front window.

As shown in FIG. 3, the front windshield glass 10 (hereinafter referred to as the windshield 10) according to the present embodiment is attached to the front window of a vehicle and arranged at an angle, with the lower end covering the engine room. Food 1
It extends further downwards than the rear end of 2. Hood 12
, the lower end of the windshield 10 , and the cowl panel 14
The space surrounded by and constitutes the storage section 18 of the wiper 16, in which the blade 15 stops at the illustrated position and enters the storage state.

As shown in FIG. 2, the wiper 16 is configured such that an arm 17 supporting a blade 15 is swung by a wiper motor (not shown) to wipe the outer surface of the windshield 10 in a range shown by a chain line.

The lower end of the windshield 10 has a stopper 20 on the lower end surface.
It is positioned in the height direction via a dam 22 and supported by the cowl panel 14, and its back side is positioned in the width direction by a dam 22 and adhesively supported by the cowl panel 14 via a butyl rubber adhesive 24.

The windshield 10 has an outer panel 2 as shown in FIG.
An intermediate film 30 made of polyvinyl butyral is sandwiched between the inner plate 6 and the inner plate 28, and these are bonded together by pressure bonding.

At the lower end of this windshield 1O, black ceramic is printed as an opaque heat transfer layer on the inner surface (surface facing the passenger compartment) of the outer panel 26 and is arranged as a ceramic print 32. On the chamber side surface, a hot wire print 34 is arranged, which is a heating wire made by printing a mixture of silver paste and glass powder in the form of fine wires.

Further, an aluminum film 36 as a heat reflective layer is printed by vapor deposition on the inner surface of the inner plate 28 (the surface opposite to the vehicle interior), facing the ceramic print 32 and the heat wire print 34. That is, the aluminum film 36 is placed between the inner plate 28 and the middle 1130.

As shown by parallel diagonal lines in FIG. 2, the ceramic print 32 is arranged over the entire width direction of the windshield IO, and the hot wire print 34 and the aluminum film 36 are also arranged in a substantially similar pattern. Therefore, the second
As shown in the figure and FIG. 3, a part of the instrument panel 37, the heat ray print 34 and the aluminum film 36 are hidden by the ceramic print 32 and are hidden from the outside of the vehicle.

As is well known, the hot wire print 34 is connected to a battery via electrical wiring, and when a switch is turned on, it is energized and generates heat.

Next, the operation of this embodiment will be explained.

If snowfall or ice blocks 38 are present in the storage section 18 of the wiper 16 as shown in FIG. 1 due to snowfall while the vehicle is parked, the hot wire print 34 is turned on after the engine is started. 1 with this operation! , the line print 34 is energized and generates heat. Heat ray print 34 generates heat from ceramic print 3
2 to the outer panel 26. On the other hand, the heat transmitted through the intermediate film 30 is reflected by the aluminum film 36, and this reflected heat is incident on the ceramic print 32 and transmitted to the outer panel 26 in the same manner as described above.

As a result, the heat generated by the hot wire print 34 is efficiently transferred to the outer panel 26 around the storage section 18, and the snow, ice blocks, etc. 38 on the outer panel 26 are melted and turned into water. This water is the outer plate 2
6, other snow and ice blocks inside the storage section 3
Melt the sun. Therefore, the wiper 16 is freed from being restrained by the weight of snow, ice, etc. 38 on the blade 15 and arm 17, and from the state where the blade 15 is stuck to the windshield 10, and can operate properly.

In addition, when driving a vehicle during snowfall, the heat ray print 34
If energized, snow that has entered the storage section 18 is immediately melted on the outer panel 26 and discharged outside the vehicle, thereby preventing snow from accumulating inside the storage section 18.

In this way, in this embodiment, a part of the heat generated by the hot wire print 34 is transmitted to the inner plate 28 and unnecessary consumption is reduced, so the amount of heat generated by the hot wire print 34 is reduced and the charge/discharge balance is reduced. It is possible to greatly improve the RI, and it is also possible to reduce the weight and cost by reducing the capacity of the alternator and battery.

Furthermore, since the heat transferred to the inner plate 28 is reduced,
The adverse effects of heat on the rubber dam 22, adhesive 24, and resin instrument panel 37 are also reduced.

In the above embodiment, the black ceramic print 32 was used as the opaque heat transfer layer, but it can absorb heat and efficiently transfer it to the outer panel 26, and can hide the back side (interior side) of this layer. Other materials can be used as long as they are suitable.

Further, although the hot wire print 34 is used as the heating wire in the above embodiment, it is also possible to use a nichrome wire, a tungsten wire, or the like.

Furthermore, although the aluminum film 36 was used as the heat reflective layer in the above embodiment, the same effect can be obtained by applying nickel plating printing to the inner plate 28, and other materials can be used as long as they can efficiently reflect heat. materials are also applicable.

〔Effect of the invention〕

As explained above, the vehicle windshield glass according to the present invention has the effect of efficiently transmitting the heat generated by the heating wire to the outer panel.

[Brief explanation of the drawing]

FIG. 1 is a detailed view of a part of FIG. 3, which is a cross-sectional view showing a main part of an embodiment of the vehicle windshield glass according to the present invention;
The figure is a front view of this embodiment as seen from the front of the vehicle, and Figure 3 is the second
This is a view corresponding to the l1l-[cotton arrow view] of the figure. lO...Front windshield glass (windshield), 26...Outer plate, 28...Inner plate, 30...Intermediate film, 32...Ceramic print (opaque heat transfer layer), 3
4... Heat wire print (heating wire), 36... Aluminum film (heat reflective layer). Fig. 1 10: Front wind seal L'Glass Oon E force (Raz) 26: To the right 28: Inner plate 3o: Middle - January member 32: Sera 8-/ri 70 Rin F (H Hideaki fever) Jno D3
4゛Heat wheel plasma Allin F (@heat rim) 36; Aluminum 8 yellow (heat reflective layer)

Claims (3)

[Claims] (1) A vehicle windshield in which an outer panel and an inner panel are joined via an interlayer film, and an opaque heat transfer layer and a heating wire are arranged at the lower end between the outer panel and the interlayer film in order from the outer panel side. A windshield glass for a vehicle, characterized in that a heat reflective layer is provided between the inner plate and the intermediate film, facing the heating wire. (2) The vehicle windshield glass according to claim (1), wherein the heat reflective layer is printed on the inner plate by aluminum vapor deposition. (3) The vehicle windshield glass according to claim (1), wherein the heat reflective layer is printed on the inner plate by nickel plating.