JPH0731962B2 - Transparent touch panel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent touch panel.

[0002]

2. Description of the Related Art Transparent touch panels are used for liquid crystal, plasma,
It is used for inputting information by placing it on the surface of a display body such as electroluminescence or for indicating coordinates by placing it on a drawing or the like. The transparent touch panel 31 has a structure as shown in FIG. 5, for example.
That is, two insulating substrates 34 and 35 having transparent conductive films 32 and 33 respectively provided on the surfaces are attached by a spacer 36 such as a double-sided tape having flat ends. Since the upper insulating substrate 35 for touch is made of a flexible thin film or the like, it hangs down as it is.
Therefore, the transparent conductive films 32 and 33 come into contact with each other and become conductive. In order to prevent this, a spacer 38, which is a dot-shaped insulating protrusion having a diameter of 0.2 to 0.5 mm and a height of 20 to 50 μm, is usually provided in the central portion 37 of the lower insulating substrate 34 at 4 to 10 mm. A plurality of them are provided at intervals of.

[0003]

However, the insulating substrate 34
If the dot-shaped spacer 38 is provided in the central portion 37 of the, there is a drawback that the screen of the display becomes difficult to see.

An object of the present invention is to improve the above-mentioned drawbacks, to prevent the conductive films from being erroneously conducted to each other, and to provide a transparent touch panel which makes it easy to see the screen of a display.

[0005]

In order to achieve the above-mentioned object, the present invention provides a transparent touch panel in which insulating substrates having transparent electrodes on the surfaces thereof are arranged so as to face each other, and the thickness is increased from the outside to the inside. The present invention provides a transparent touch panel having a thicker separator at the end.

Further, according to the present invention, in a transparent touch panel in which insulating substrates having transparent electrodes on the surfaces are arranged so as to face each other, a separator is provided at an end, and at least one of an upper surface and a lower surface of the separator has an outer surface. The present invention provides a transparent touch panel, which is characterized in that an insulating material made of an adhesive whose thickness increases from the inside to the inside is provided.

[0007]

The thickness of the separator provided at the end portion is increased from the outside to the inside, or at least one of the upper surface and the lower surface of the separator is made of an adhesive whose thickness increases from the outside to the inside. By providing the insulating material, the end portion of the insulating substrate for touching can be directed toward the central portion and can be inclined further away from the opposing insulating substrate. As a result, the central part of the insulating substrate for touch hangs down,
It is possible to prevent the transparent conductive films provided on each insulating substrate from coming into contact with each other. Therefore, it suffices to omit the dot-shaped spacers or to provide the spacers inconspicuous to the opposing insulating substrates.

[0008]

EXAMPLES The present invention will be described below based on examples.
In FIG. 1, reference numeral 1 is an insulating substrate made of a glass plate having a thickness of 1.8 mm. 2 is provided in the central part of the insulating substrate 1,
It is a transparent conductive film made of ITO having a thickness of 500 Å. Reference numeral 3 denotes an insulating substrate for touch, which is arranged to face the insulating substrate 1 and has a width of 20 cm, a length of 9 cm, and a thickness of 1.
It consists of a polyester film with a hard coat of 25 μm. 4 is a thickness 5 provided in the central portion 5 of the insulating substrate 3.
It is a transparent conductive film made of ITO of 00 angstrom. 6 is an end portion 7 of the insulating substrate 1 and the insulating substrate 3 for touch.
Is a spacer made of double-sided tape provided at the end 8 of
20 μm thick adhesive 9 on both sides of polyester film
And 10 are provided, and the inside 12 is thicker by about 50 μm than the outside 11. According to the above example,
Since the inner side 12 of the spacer 6 is thicker than the outer side 11, the touch insulating substrate 3 is inclined such that the end portion 8 is separated from the insulating substrate 1 toward the central portion 5. Therefore, the central portion 5 is slightly swollen and is less likely to hang down. Therefore, in this embodiment, it is not necessary to provide the insulating substrate 1 with dot-shaped spacers. Further, since the dot-shaped spacer can be omitted, the screen of the display can be easily viewed, and when used in a handwriting input device or the like, there is no defect that the input is interrupted at the spacer.

FIG. 2 shows another embodiment of the present invention, in which the same parts as those in FIG. 1 are designated by the same reference numerals. In this embodiment, the spacer 13 is formed by stacking two double-sided tapes each having an adhesive layer on both sides of a polyester film having a constant thickness to form an inclination. That is, the base double-sided tape 14 is attached to the insulating substrate 1 with a normal width. Then, the double-sided tape 15 having a width narrower than ½ of the double-sided tape 14 is attached to the inner upper surface of the double-sided tape 14. In addition, some or all of the adhesive layers 16 and 17 on the upper surfaces of the double-sided tapes 14 and 15 are inclined according to the inclination of the end portion 8 of the insulating substrate 3. In addition, the lower insulating substrate 18
Is provided with a dot-shaped spacer 19. The spacer 19 has a diameter of 0.01 to 0.2 mm and a height of 1 to 20 μm.
It is provided in such a size that it is inconspicuous at intervals of 0.5 to 4 mm.

Further, FIG. 3 also shows another embodiment of the present invention, in which the same parts as those in FIG. 1 are designated by the same reference numerals. In this embodiment, the separator 20 is usually a double-sided tape having a constant thickness. Then, the insulating material 21 is thickly applied inward to the lower portion of the separator 20.

It is not necessary to incline all the end portions of the touch insulating substrate. For example, as shown in FIG. 5, if the insulating substrate 22 is a quadrangle, only the separators 23 and 24 provided at the two opposite ends need to be inclined.

[0012]

As described above, according to the present invention, the thickness of the separator provided at the end portion is increased from the outer side to the inner side, or at least one of the upper surface and the lower surface of the separator is provided from the outer side to the inner side. By providing an insulator made of an adhesive that becomes thicker toward the center, the end of the insulating substrate for touch is directed toward the center part and is tilted further away from the opposing insulating substrate, so that the transparent conductive films are not connected to each other. A transparent touch panel capable of preventing erroneous conduction of is obtained. Further, since the dot-shaped spacer provided in the central portion of the insulating substrate can be omitted or the size can be made inconspicuous, a transparent touch panel such as a display on a display can be easily obtained.

[Brief description of drawings]

FIG. 1 shows a cross-sectional view of an embodiment of the present invention.

FIG. 2 shows a cross-sectional view of another embodiment of the present invention.

FIG. 3 shows a cross-sectional view of another embodiment of the present invention.

FIG. 4 is a perspective view showing a state where a separator is provided on an insulating substrate used in another embodiment of the present invention.

FIG. 5 shows a cross-sectional view of a conventional transparent touch panel.

[Explanation of reference numerals] 1,8,22 ... Insulating substrate, 2,4 ... Transparent conductive film, 3
... Insulating substrate for touch, 5 ... Central part, 6, 13, 20,
23, 24 ... Separator, 7, 8 ... End part.

Claims (2)

[Claims] 1. A transparent touch panel in which insulating substrates having transparent electrodes provided on their surfaces are arranged so as to face each other .
Install a separator that will become thicker from the inside to the end.
Transparent touch panel, wherein the digit. 2. Insulating substrates having transparent electrodes on the surface
In the transparent touch panel with the
A separator is provided, and a small number of
At least on one side, from the outside to the inside
Characterized by providing an insulator made of an adhesive that becomes thicker
Transparent touch panel.