JPH0354048A - Ice melting window glass - Google Patents

Abstract

PURPOSE:To perform uniform heating throughout the whole surfaces of upper and lower parts having different areas by a method wherein a number of through-holes are formed in the upper half part of a clear insulating resin film located between the joint surfaces of laminated glass, and heat generating substances disposed on the two surfaces of the film are short-circuited. CONSTITUTION:An ice melting window glass is formed such that a clear insulating resin film 9 is located between the joint surfaces of laminated glass bodies 7 and 8. In this case, a number of through-holes 9a are formed in the part, positioned facing the upper half part of the window glass, of the clear insulating resin film 9. Heat generating substances 10 and 11 formed of a clear conductive metallic film are disposed on both surfaces of the clear insulating resin film 9, and are short-circuited to each other through the through-holes 9a. The one heat generating substance positioned on the outer surface of the window glass is connected to a pair of electrodes 12 and 13 arranged along the upper and lower edges of the window glass. This constitution causes uniform heating of the window glass throughout the whole surfaces of upper and lower parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an ice-melting windshield suitable for automobile windshields, etc., which has functions such as frost prevention, defrosting, and ice melting.

[Conventional technology]

Conventionally, as for the above-mentioned ice-melting window glasses, those shown in FIGS. 5 and 6 are known. This involves interposing a heating element 3 made of a transparent conductive metal thin film between the joint surfaces of the laminated window glass bodies 1 and 2, and connecting a pair of electric currents I! to the heating element 3. ! The windshield main bodies 1 and 2 are heated by supplying electricity through ii5.6.

The applicant has previously filed an application with basically the same structure as this (Utility Model Application Publication No. 01-11-45).
(See Publication No. 59).

[Problem to be solved by the invention]

By the way, since the area of the heat generating hole 3 of the transparent conductive thin film is generally different between the upper and lower parts of the windshield, a pair of electrodes 5.6 connected thereto are connected to the upper and lower edges of the windshield as shown in FIG. When the windshield is placed along the lower part of the window glass, which has a large area, the resistance value decreases, and the amount of heat generated decreases accordingly. For this reason, the temperature of the lower part of the window glass bodies 1, 2 is lower than that of the upper part, and as shown in FIG. 7, there is a problem in that the defrosting and ice melting effects become uneven.

Therefore, an object of the present invention is to alleviate unevenness in defrost and ice melting effects.

[Means to solve the problem]

For this purpose, the present invention heats the window glass body by interposing a heating element made of a transparent conductive thin film between the joint surfaces of the window glass body, and applying B current to the heating element through a pair of electrodes. The transparent insulating resin film of the laminated glass interlayer has a plurality of through holes in the upper half of the window glass, and the transparent conductive resin film short-circuits to the heating element through these through holes. It is made by coating one side of the other joint surface with a thin film heating element.

[For production]

In such a means, by energizing the heating element on one side of the bonding surface through a pair of electrodes, the heating element on one side of the other bonding surface is also energized, so that both heating elements generate heat.

At that time, both heating elements are short-circuited in the upper half of the window glass, which has a smaller area, and the resistance value becomes smaller, so the amount of heat generated is also smaller, and is balanced with the amount of heat generated by both heating elements in the lower half of the window glass. Become. Therefore, the window glass body is heated substantially uniformly over the entire surface, and unevenness caused by defrost and water melting is alleviated.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 show an ice-melting windshield used as a front windshield of an automobile, in which a transparent insulating resin film 9 is interposed between the joint surfaces of a laminated windshield body 7.8.

Here, the transparent insulating resin film 9 is provided with a plurality of through holes 9a in the upper half of the window glass. Heating elements 10 and 11 made of transparent conductive metal thin films are interposed on both sides of the transparent insulating resin film 9, respectively, and both are short-circuited to each other via the through hole 9a.

Further, a pair of turtle poles 12 and 13 arranged along the upper and lower edges of the window glass are connected to one of the heating elements 10 located on the outer surface side of the window glass.

The ice-melting window glass configured in this way has a heating element 1
0 is a pair of electrodes 12. 13, the circuit is configured as shown in FIG. 3, and performs functions such as frost prevention, defrost, and ice melting. That is, the heating element 10 is circuit-configured to the vehicle battery 19 via the manual switch 17 and the main switch 18, and the manual switch 17
A relay switch 2l of the controller 20 is connected in parallel to the relay switch 2l of the controller 20.

The controller 20 includes a humidity sensor 22 and a temperature sensor 23 installed to detect the humidity and temperature on the outer surface of the ice melting window glass, and a 100% on signal when the humidity increases based on the detection signal of the humidity sensor 22. A humidity judgment stage 24 outputs an off signal at 90% when the humidity drops, and outputs an on signal at 0°C when the temperature drops based on the detection signal of the temperature sensor z3, and turns 1 when the temperature rises.
It has a temperature determination means 25 that outputs an off signal at °C.

Moreover, these humidity determination means z4 and temperature determination means 25
It has an AND gate 2B that inputs a signal from the terminal, and a switching transistor 27 to which the output signal of the AND gate 2B is input. The circuit is structured as follows.

In the above configuration, when the main switch 18 is turned on, the ice-melting window glass exhibits functions such as frost prevention, defrosting, and ice melting in response to the operation of the manual switch 17 or the action of the controller 20.

For example, to prevent WI from reaching the windshield body 7.8, turn off the manual switch l7 and connect the heating element lO to the vehicle battery lO via the relay switch 2l.
9. Configure the circuit. Then, in an environment where frost forms on the windshield body 7.8, that is, when the humidity on the outer surface of the windshield body 7 is 100% and the temperature is below 0°C, the mixture determination means 24 detects the humidity by the humidity sensor 22. outputs an on signal, and temperature determination means 25 outputs an on signal based on temperature detection by temperature sensor 23. Then, the AND gate 26 is opened, the switching transistor 27 is turned on, and the relay switch 2l is turned on by energizing the relay film 21a. Therefore, power from the vehicle battery l9 is applied to the heating element IO by the main switch l8 and the relay switch 2.
This heat generating element 10 and other heat generating elements 11 short-circuited to this heat generating element 10 generate heat to maintain the windshield body 7.8 at a temperature higher than the saturated water vapor temperature, thereby preventing frost formation. Prevented.

In this case, if the temperature of the windshield body 7.8 increases and the humidity detected by the humidity sensor 22 drops to 90% or less, or if the temperature detected by the temperature sensor 23 rises to 1° C. or more, the humidity determining means 24 or The degree determination means 25 outputs an off signal.

Therefore, the AND gate 2B is closed, the switching transistor 27 is turned off, and the relay switch 2l is turned off. In this way, the power supply to the heating element IO is cut off, and frost formation on the window glass body 7.8 is prevented with minimum power consumption.

In addition, in order to melt and remove frost and ice adhering to the windshield body 7.8, turn on the manual switch chair. Then, power from the vehicle battery l9 is supplied to the heating element IO via the main switch 18 and the manual switch I7, and the heating element 1[1 and the heating element 1
1 generates heat, the windshield body 7.8 is heated and its temperature rises, and the frost and ice that have adhered thereto are melted and removed. In this case, both heating elements IO, 1l are short-circuited in the upper half of the window glass, which has a smaller area, and the resistance value becomes smaller, so the amount of heat generated also becomes smaller. Then, the temperature of the windshield body 7.8 becomes almost uniform over the entire surface, and the temperature rises.
As shown in FIG. 4, unevenness in defrost and ice melting effects is alleviated.

〔Effect of the invention〕

As explained above, according to the present invention -1. ) By applying electricity to the heating element on one side of the transparent insulating resin film, electricity is also applied to the heating element on the other side, and both heating elements generate heat. At this time, both heating elements in the upper half of the window glass, which has a smaller area, are short-circuited and the resistance value becomes smaller, so the amount of heat generated is also reduced, and it is balanced with the amount of heat generated by both heating elements in the lower half of the window glass. become. Therefore, the window glass body is heated substantially uniformly over the entire surface, and unevenness in defrosting and ice melting effects is alleviated.

[Brief explanation of drawings]

FIG. 1 is a front view of an ice melting window glass according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a circuit configuration diagram of an ice melting window glass according to an embodiment of the present invention. , Fig. 4 is an explanatory diagram of the operation of one embodiment, Fig. 5 is a front view showing a conventional example of ice melting window glass, Fig. 6 is a sectional view taken along the line vt-vt of Fig. 5, and Fig. 7 is a conventional example. FIG. 1.2...Laminated window glass body, 3...Heating element, 4...Transparent insulating resin film, 5.6...Electrode, 7, 8...Wind glass body, 9...Transparent Insulating resin film, 9a... through hole, 10. DESCRIPTION OF SYMBOLS 11... Heating element, l7... Manual switch, l8... Main switch, 20... Controller, 21a... Relay coil, 23... Temperature sensor, 25... Temperature determination means, 27 ...Switching truck 12. DESCRIPTION OF SYMBOLS 13... Electrode, l9... Vehicle battery, 2l... Relay switch, 22... Humidity sensor, 24... Humidity determination means, 26... AND gate, register.

Claims (1)

[Scope of Claims] A heating element made of a transparent conductive thin film is interposed between the joint surfaces of the window glass body, and the window glass body is heated by applying electricity to the heating element through a pair of electrodes. In the ice melting window glass, the transparent insulating resin film of the laminated glass interlayer has a plurality of through holes in the upper half of the window glass, and the transparent conductive thin film heating element is short-circuited to the heating element through the through holes. The other joint surface is also coated on one side to make the ice-melting window glass.