JPH0615312Y2 - Transparent touch input device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a transparent touch input device used for OA equipment and the like.

2. Description of the Related Art Conventionally, in a transparent touch input device, two transparent insulating sheets are arranged with a predetermined interval, and a plurality of electrodes are arranged on one surface of the two insulating sheets facing each other. It is formed of a long transparent conductive sheet electrode, and one of the insulating sheets is arranged in the horizontal direction and the other in the vertical direction with a predetermined interval, and the intersection of the electrodes serves as a contact point, and this contact point There is a structure in which a plurality of electrodes are arranged in a matrix and the contacts are closed when the intersections of the electrodes are pressed.

FIG. 4 is a sectional view showing an example of a conventional transparent touch input device in which transparent conductive sheet electrodes 14 and 15 are formed on two transparent insulating sheets 11 and 12. In this figure, 11 is a transparent insulating sheet on the side facing the display device, 12 is a transparent insulating sheet on the side touched by an operator's finger, 13 is a spacer, and 14 is a spacer.
Is a transparent conductive sheet electrode provided on the transparent insulating sheet 11, 15 is a transparent conductive sheet electrode provided on the transparent insulating sheet 12, and 16 is a display device.

FIG. 5 is a plan view of the device of FIG. Input is made by pressing the intersection 17 of the transparent conductive sheet electrode 14 and the transparent conductive sheet electrode 15 from above the transparent insulating sheet 12 and contacting both electrodes 14 and 15 by expansion and contraction of the transparent insulating sheet 12. The transparent insulating sheets 11 and 12 are
A polymer film having a thickness of 5 μ or more and 500 μ or less, such as a biaxially stretched polyethylene terephthalate film, is used. The transparent conductive sheet electrodes 14 and 15 are made of various metals such as aluminum, zinc, iron, nickel, tantalum, copper, gold, silver and cobalt, metal oxides such as tin oxide and indium tin oxide, and copper iodide. Other conductive materials such as titanium nitride and titanium nitride are vapor-deposited on a transparent film through a belt-shaped mask by a vacuum vapor deposition method, a sputtering method or an ion plating method.

However, in the above-mentioned conventional transparent touch input device, since the transparent insulating sheets 11 and 12 are made of a film, the chemical resistance is weak, and expansion and contraction with respect to low temperature and high temperature resistance does not occur. There was a big problem.

The present invention solves such conventional problems, and an object of the present invention is to provide an excellent transparent touch input device which has a high chemical resistance and a small expansion / contraction with temperature.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a transparent touch input device based on partially pressing a pair of transparent conductive layers facing each other so as to electrically contact a part of the transparent conductive layers. In, the transparent conductive layer base material on the input side is partially bent by pressing, the thin glass, the other transparent conductive layer base material on the input side is not partially bent by pressing, and the thin glass And a spacer provided between the other glass and a protective sheet that is adhered to the side of the thin glass that does not face the other glass, and this protective sheet faces the thin glass of the other glass. A liquid crystal display element disposed on the non-use side is made of a polarizing material that also serves as a polarizing film.

Action The present invention has the following actions or effects due to the above configuration. That is, by forming the insulating sheet of the transparent touch input device from a film instead of a glass, a transparent touch input device that has high strength and hardness, good chemical resistance, and little expansion and contraction due to temperature can be provided. In addition to providing the protection sheet, the protective sheet is adhered to the thin glass, so that even if the thin glass is damaged, the thin glass does not scatter and the safety of the transparent touch input device, which is mainly a finger input in use, is improved and this protection is provided. Since the sheet was made of a polarizing material and also served as the polarizing film of the liquid crystal display element, this protective sheet can reduce the reflected light reflected on the glass on the surface of the liquid crystal display element, and the total surface area of the liquid crystal surface element can be reduced by using the protective sheet. In addition, it is possible to provide a transparent touch input device with low cost.

Embodiments Before describing an embodiment of the present invention, an improvement example prior to the present invention will be described with reference to FIGS. 2 and 3. According to the figure, 1 is a transparent thin glass plate on the side touched by an operator's finger (specifically, a thin glass plate having a thickness of 0.2 to 0.3 mm), 2 is a transparent conductive sheet electrode provided on the thin glass plate, and 3 is a pressing member. Spacers whose thickness changes by 4 are transparent thick glass that is another glass that faces the thin glass and forms a pair (specifically, thick glass having a thickness of 1 to 3 mm), and 5 is provided on the thick glass 4. The transparent conductive sheet electrode 6 is a display device, and a liquid crystal display element, CRT, plasma display or the like is used.
Reference numeral 7 indicates a protective sheet that is in close contact with the thin glass plate 1.

Next, the operation of the improvement example will be described. In the improvement example, when the finger is pressed from above the protective sheet 7, the thin glass sheet 1 is bent. Further, the transparent conductive sheet electrode 2 on the thin glass sheet 1 and the transparent conductive sheet electrode 5 on the thick glass sheet 4 are usually deformed by pressing to deform the spacers 3 to reduce the thickness dimension. Input is made by contacting both electrodes 2 and 5.

The thin glass plate 1 is made of transparent soda glass having a thickness of 0.2 mm. The protective sheet 7 is made of a polymer film such as a polyethylene terephthalate film having a thickness of 5 to 500 μ. The spacer 3 is made of transparent silicon rubber, has a thickness of 30 to 70 μm, and has a thickness that allows the thin glass plate 1 to bend so that the electrodes 2 and 5 can contact each other. There is. The thick glass plate 4 is made of transparent soda glass having a thickness of 2 to 3 mm, which does not affect the display device 6 even when pressed with a finger. The transparent conductive sheet electrodes 2 and 5 are obtained by screen-printing an indium oxide thin film on the upper surface of glass, baking and curing it, and have a thickness of 700 to 1000Å.

As described above, according to the improved example, the transparent insulating sheet on the side touched by the operator's finger is made of glass, so that the advantage of the glass is that it has excellent chemical resistance and small expansion and contraction due to temperature. However, it is possible to provide an excellent transparent touch input device.

FIG. 1 shows an embodiment of the transparent touch input device of the present invention in which a liquid crystal display element is arranged on the lower side, which is a further improvement of the improved transparent touch input device. To give a description, omitting the description, reference numeral 1 is a thin glass, and a protective sheet 8 having a polarizing material on the upper portion thereof.
Are closely attached. 28 is the thin glass 1,
A transparent touch input device of the present invention comprising a protective sheet 8, transparent conductive sheet electrodes 2 and 6, a spacer 3 and a thick glass plate 4, 27 is disposed on the side of the thick glass plate 4 not facing the thin glass plate 1, The liquid crystal display element is composed of the glass 20, 24, the spacer 23, the transparent electrodes 21, 22 and the polarizing film 25 formed on the lower surface of the lower glass 24, and the polarizing material is used for the protective sheet 8 of the transparent touch input device 28. In this liquid crystal display element 27, the upper glass 2
The upper polarizing film is not provided.

In the above-described embodiment, the thin glass plate 1 that is bent by pressing with a finger and the thick glass plate 4 that is not bent are shown as examples, but the thick glass plate 4 can be used as long as the liquid crystal display element 27 can be pressed. Alternatively, thin glass may be used.

In this case, since the glass is even thinner, the transparent touch input device and the liquid crystal display element 27 are in close contact with each other, and the effect of reducing parallax can be obtained.

Further, when the transparent insulating sheet 12 such as the conventional transparent touch input device described in FIGS. 4 and 5 is replaced with the thin glass sheet 1 of the present invention, as described above, the chemical resistance, low temperature resistance,
In addition to having a problem in high temperature resistance, the transparent insulating sheet 12 is generally produced by a stretching process, so that it impairs the polarization effect and causes a problem in liquid crystal display. That is, the present invention has an effect by using a protective sheet made of a polarizing material on glass.

The protective sheet 8 made of a polarizing material is used for a well-known liquid crystal display element (for example, Japanese Utility Model Application 60-591).
No. 13 (Japanese Utility Model Publication No. 61-177338), a polarizing film in which a hydrophilic polymer film disclosed in a copy of a microfilm is adsorbed and oriented with iodine or the like, or a film made of a polyimide-based polymer or the like by a contact agent or the like on this polarizing film (A film-shaped polarizing plate whose surface is protected by pasting together)
Should be used.

As described above, the present invention is composed of the glass base material on both the part touched by the finger and the side facing the display device in the transparent touch input device.
In addition to having a great effect on mechanical strength, the protective sheet is provided in close contact with the glass on the side where it is touched with a finger, so even if the glass breaks due to impact, the glass is prevented from scattering and the safety of the operator is increased. In addition, since this protective sheet is made of a polarizing material, it can also serve as one side of the liquid crystal display element located on the lower side, thus providing a transparent touch input device of low cost in total.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the transparent touch input device of the present invention, FIG. 2 is a sectional view of an improved example prior to the transparent touch input device of the present invention, and FIG. 3 is a sectional view when pressed by the same finger. 4 is a sectional view of a conventional transparent touch input device, and FIG. 5 is a plan view of a conventional transparent touch input device. 1 ... Thin glass, 2 ... Transparent conductive sheet electrode, 3 ...
Spacer, 4 ... Thick glass, 5 ... Transparent conductive sheet electrode, 8 ... Protective sheet, 27 ... Liquid crystal display element.

Claims (1)

[Scope of utility model registration request] 1. A thin glass sheet in which a transparent conductive layer base material on the input side is partially bent by pressing, and another glass sheet in which a transparent conductive layer base material forming a pair on the input side is not partially bent by pressing,
A spacer provided between the thin glass and the other glass, and a liquid crystal display that is in close contact with a side of the thin glass that does not face the other glass and that is arranged on a side of the other glass that does not face the thin glass. A transparent touch input device comprising a protective sheet made of a polarizing material that also serves as one polarizing film of the element.