JPH0667784A - Conductive tablet material - Google Patents

Abstract

PURPOSE:To provide a conductive tablet made of conductive tablet material used in an input device which detects an arbitrary position on the absissa and the ordinate and with superior insulating property, a low cost, light weight, and easy handling. CONSTITUTION:Conductive patterns 2, 3 are formed on two planes of plastic film 1 which comprises a base material. Furthermore, insulating layers 4, 5 are provided so as to cover the conductive patterns 2, 3. Since the plastic film 1 itself displays the role of the insulating layer, high insulating reliability can be obtained. Also, since it is not required to thicken the insulating layer between the conductive patterns to increase the insulating property like in a conventional device, the light weight, superior flexibility, and the reduction of material cost can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive tablet material used as a touch panel.

[0002]

2. Description of the Related Art A touch panel is an input device capable of touching the screen with a pointing pen or the like while seeing pictures or characters on a panel attached to a display screen, detecting the positions of vertical and horizontal axes, and inputting the coordinate positions thereof. And this touch panel has an optical sensor method, a resistive film method, an electrostatic capacity method,
Although there are various types such as an electromagnetic induction type, the electromagnetic induction type is currently most commonly used.

As a conductive tablet material used in this electromagnetic induction method, conventionally, as shown in FIG. 3, a conductive pattern 12 is first formed on one surface of a plastic film 11 in parallel with the horizontal axis direction, and insulation is performed thereon. It is known that a layer 14 is formed, a conductive pattern 13 is formed on the layer 14 in parallel to the vertical axis direction so as to be orthogonal to the layer 14, and finally an insulating layer 15 is formed.

[0004]

In the above-mentioned conventional conductive tablet material, in order to satisfy the recent demands for fine patterns, the insulating layer 14 between the conductive patterns 12 and 13 is made thicker so that the disconnection between the two is caused. It is necessary to prevent short circuits.
However, if the insulating layer 14 is made thicker, the overall weight is increased, the material cost is increased, the bending property is deteriorated due to the lack of flexibility, and on the contrary, the conductive patterns 12 and 13 are likely to be broken. However, it was difficult to manufacture a highly accurate conductive tablet material.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a conductive tablet material which is excellent in insulating property, inexpensive, lightweight and easy to handle. is there.

[0006]

In order to achieve the above object, the conductive tablet material of the present invention is characterized in that conductive patterns are formed on both sides of a plastic film.

[0007]

According to the conductive tablet material of the present invention described above, since the plastic film forms the insulating layer, it has the characteristics of high insulation reliability, large flexibility and easy handling.

[0008]

EXAMPLES Examples will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a conductive tablet material according to the present invention, and FIG. 2 is a sectional view taken along line XX of FIG.

In the figure, reference numeral 1 denotes a plastic film, which is made of a material such as polyester or polyimide and has a thickness of 25 to 300 μm. Reference numerals 2 and 3 denote conductive patterns, which are formed of a conductive material on both sides of the plastic film 1 so as to be orthogonal to each other. Also,
Insulating layers 4 and 5 are provided so as to cover the conductive patterns 2 and 3.

As the conductive material for forming the conductive patterns 2 and 3, one kind or a combination of two or more kinds selected from silver, copper and carbon and mixed with a synthetic resin binder is used. When silver-based paint is used as the conductive material, migration of silver can be prevented by providing an insulating layer of synthetic resin on the surface of the conductive patterns 2 and 3 or coating with carbon-based paint.

(Specific example) First, a silver ink (Fujikura Kasei, Dauite FA-312) was printed on one side of a 125 μm thick polyester film in a horizontal axis direction with a width of 0.6 mm, and insulation of synthetic resin was applied thereon. The layers were processed to a thickness of 10 μm. Next, a silver ink having a width of 0.6 mm was printed on the opposite surface of the polyester film in the vertical axis direction, and an insulating layer having a thickness of 10 μm was formed thereon.

Comparative Example A silver ink having a width of 0.6 mm was printed on one surface of a polyester film having a thickness of 125 μm in the horizontal direction, and an insulating layer of synthetic resin having a thickness of 50 μm was processed thereon. Further, a silver ink was printed on it in the direction of the vertical axis, and an insulating layer was formed thereon with a thickness of 10 μm.

The conductive tablet materials of the above specific examples are excellent in insulation because the conductive patterns are on both sides of the plastic film. Further, when compared with the conductive tablet materials prepared in Comparative Examples, they are light and flexible. Was excellent.

[0015]

As described above, since the conductive tablet material of the present invention has a structure in which conductive patterns are formed on both sides of a plastic film, the plastic film itself serves as an insulating layer and thus has high insulation reliability. Moreover, since it is not necessary to increase the thickness of the insulating layer between the conductive patterns in order to enhance the insulating property as in the conventional case, it is excellent in light weight and flexibility, can reduce the material cost, and is easy to handle. Etc., the practical effect is great.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a conductive tablet material according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Plastic film 2,3 Conductive pattern 4,5 Insulation layer

Claims (1)

[Claims] 1. A conductive tablet material used for an input device for detecting an arbitrary position on the vertical and horizontal axes, characterized in that conductive patterns are formed on both surfaces of a plastic film.