JPS58116240A - Front glass for car - Google Patents

Abstract

PURPOSE:To recognize an indication without moving eyes in a front glass for automobile and the like by providing a transmissible electrochromic indicator in a part of a visual field. CONSTITUTION:A transparent electrode film of indium oxide, an indication pattern films of iridium hydroxide, tantalum pentaoxide, and tantalum trioxide, and an opposite electrode film of indium oxide, are successively laminated on a glass substrate or the like by vacuum deposition, photoresist method, or other processes for forming an EC indicator 2. This indicator 2 is attached to a front glass 1, and connected to an external electric source via a very fine lead wire 4 and an EC indicator drive circuit 5. Now, when an overspeed is detected by an overspeed detector 6, a 1.4-volt current is added via the drive circuit 5 to indicate blue letters ''OVER''. Meanwhile, when the speed is returned to a normal level, an inverse voltage is added to erase the blue indication and restore colorless transparency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to windshields for vehicles such as automobiles, airplanes, trains, etc.

It is important to have a means for notifying the driver of a vehicle, such as a car, airplane, train, etc., of an emergency m' while driving. It is especially important to inform drivers of cars driving at high speeds of engine abnormalities such as overheating, nearing fuel depletion, overspeeding, etc. It is very dangerous to look at the instrument panel to find out.

Currently, cars that emit a beeping sound when the speed exceeds, for example, 120'/Jt have been reprinted, but audible warnings have the disadvantage of being limited in the types of sounds and being difficult to hear when the surroundings are noisy. .

Therefore, the inventors of the present invention thought that if a warning could be displayed visually within the field of view of the windshield, which the driver always looks at, it would be possible to make the driver aware of it without fail. Even when not displayed, it obstructs the field of view, and for safety reasons, it could not be attached to the windshield.

By the way, electrochromic (electrochromic) refers to substances that undergo reversible oxidation-reduction reactions and reversibly color and fade when voltage is applied.
(Hereinafter abbreviated as EC) material, and an attempt has already been made to create a display body in which such a material is sandwiched between a pair of transparent electrodes, and to use this material to display numbers on watches, calculators, etc. There is. Recently, (g) a transparent electrode layer, a reduction coloring EC layer such as Woe, Moose, a transparent ionic conductor layer such as Tames, 5ift, an oxidation coloring GC layer such as N1(OH)n, Ir(OH)n, etc. and (6) an all-solid-state transmission type EC display consisting of a transparent electrode layer was developed (see % Japanese Patent Publication No. 1983-4679). This kind of EC display body 1, total of 2 to 5 pieces excluding the glass substrate.
It can be made as thin as μm, and when the transmittance is about 80% and a voltage of about 0.8 to 1.4 volts is applied during decolorization, it becomes 150 volts.
~350m5ec, it becomes colored blue and the transmittance decreases to about 151, and this blue color is remembered even if the voltage application is stopped.On the other hand, if there is a short circuit or a reverse voltage of the same level as the coloring voltage is applied, the time required for coloring decreases. It returns to its original colorless transparency in about a minute.

The present inventors focused on this transmissive EC display, and found that it is colorless and transparent when not displaying, so it does not obstruct the field of view, and it can display information instantly electrically, so it can be displayed on the inner or outer surface of the windshield. The present inventors have discovered that it can be attached to a part of the intermediate layer and used for various displays, and have accomplished the present invention.

That is, the present invention provides a transmissive EC display, especially a liquid, in a part of the field of view of a vehicle windshield (glass may be laminated glass, organic glass, or transparent hard plastic as well as ordinary inorganic glass). It is an all-solid thin film type with no worries about leakage. The EC display body is made of a separate transparent glass substrate, a transparent hard plastic substrate,
It may be formed on a transparent flexible plastic substrate and adhered or adhered to the windshield, or the windshield may be used directly as a substrate and the EC display body may be formed thereon.

The types of displays include overspeed warning, warning of insufficient fuel, oil, brake fluid, coolant, etc., puncture warning, overheating warning, door ajar warning, handbrake warning, and abnormally approaching vehicle in front (speed warning). display of driving direction (north, south, east, west, etc.), speed, engine speed, engine or coolant temperature, mileage, battery. Voltage,
Examples include digital or analog display of quantities such as charging status, oil level, altitude, and indoor temperature.

From the viewpoint of safety, it is preferable to display these displays in an emergency or as needed, but depending on the situation, it is possible to display them intermittently or constantly if they are near the periphery of the visual field.

Even in the case of a constant display, the distance the line of sight travels is shorter than the current state where the display is on the dash board, so if the present invention is more important to safety, it can be displayed not only on the windshield but also on the side and rear windows. It is also possible to install one.

Next, the present invention will be specifically explained by examples with reference to the drawings.

Example A transparent electrode film (ITO; made of indium oxide mixed with a trace amount of tin oxide) with a thickness of 0.15 μm was supported on a glass plate measuring 50 cm long x 80 cm wide x 1 cm thick. Then, the thickness was 0,
After forming a thin film of iridium metal with a thickness of 0.01 .mu.m, a photoresist was applied, and the pattern was baked and developed so that the resist remained only on the characters [OV'FJRJ shown in FIG. 1]. No resist film remained in the non-display area, and the exposed iridium metal thin film was removed using the keto etching method, and the resist on the remaining text area (display area) was removed by ashing in an oxygen-containing gas. By electrolytically oxidizing the thin film (text) in an aqueous sulfuric acid solution, it became a transparent iridium hydroxide thin film. 1~2X10'Torr, deposition rate 2~3X10'pm/sec)K
A transparent thin film of tantalum pentoxide with a thickness of 0.25 μm was formed. Vacuum evaporation method (H
Thickness of 0.0 mm due to partial pressure/1~2 x 10'Torr, deposition rate 5~10 x 10 μm/see).
A 25 μm transparent thin film of tungsten trioxide was formed.

After installation, connect the electrode in contact with tungsten trioxide to the cathode of an external power source, and the electrode in contact with iridium hydroxide to the anode of an external power source, and apply a voltage of 1.4 volts.The blue letters rOVERJ will appear. appeared. The contrast ratio of the display area before and after coloring was 1:3. When a reverse voltage of 1.4 volts is applied to this display, the blue [
0VERJ disappeared and returned to its original colorless transparency.

This EC display body is placed inside the windshield of a car.
On the surface, slightly above the driver's eyes and horizontal position tj &
Paste with a colorless transparent adhesive such as epoxy adhesive,
The input signal to the conventional speed over warning sound transmitter was transformed to a predetermined voltage and then wired to be input to the body 71.

When I drove this car all the way, the field of view through the windshield was mostly unobstructed and good, but when the speed was 1201b/
When the vehicle crossed over l'i, the letters rOVERj appeared intermittently on the windshield, as shown in Figure 2, and were immediately recognized.

According to the VC of the present invention, by providing a transmission type GC front display film on the windshield, the field of view is not obstructed during normal times (unnecessary times), and when the display is displayed, the visual field is not moved at all or almost. The driver can be made aware of the predetermined information without having to worry about it. This is particularly useful for hearing-impaired drivers. In addition, since the display appears within the field of view, the display cannot be ignored and is a nuisance. FIG. 2 is a replica view of the above-mentioned embodiment in which the rOVERJ display is displayed on the windshield, as seen from the indoor side.

(1)...Windshield, (2)...EC display body, (3)...Room mirror, (4)...Lead wire that controls the EC display body, (5)...Ecc Display drive circuit, (6)... speed over detection device.

Applicant: Nippon Kogaku Kogyo Co., Ltd. Agent Takao Watanabe

Claims (1)

[Claims] A vehicle windshield with a transmissive electrochromic display in a portion of the field of view.