JPS6292302A - Transparent resistive sheet with conductive layer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an image information input device in information-related equipment.
electrically transparent resistive sheet used for practical purposes.

A transparent human-powered device made using this method is overlapped with a planar display so that input and output can be performed on the same surface, and is used as a word processor) computer or video telephone terminal.

(Prior art) A plurality of electrodes are provided around a sheet with appropriate sheet resistance, electricity is injected from one point in the sheet, and the coordinate data of the injection point is obtained by detecting the amount of electricity flowing into each electrode. It is known that input is possible. If the sheet is transparent, such as No. 2 glass, input and output can be performed on the same surface by combining it with a panel display such as a dot matrix liquid crystal display. It can be used as an IJ or image phone terminal.

(Problems to be solved by the invention) Generally, a transparent resistive film is an extremely thin film made of metal or metal oxide. Therefore, when an input pen is directly run over this resistive film, there is a problem in that the resistive film is scratched and the accurate position detection function is impaired. The present invention relates to an improved transparent resistive sheet 1- which maintains the manual function of a pen while preventing damage to the resistive film caused by the pen.

(Means for Solving the Problems) In order to achieve the above object, the present invention 1 consists of the following configuration.

[A sheet consisting of a transparent sheet-like base material and a transparent 4F conductive layer, a transparent electrically resistive film is formed on the surface layer of the sheet-like M material on the anisotropically conductive layer side, and the anisotropically conductive layer is characterized in that a large number of conductive short fibers are oriented in the thickness direction in a transparent hard insulating layer, and the sheet-like base material and the anisotropic conductive layer are tightly bonded and integrated. Transparent resistive sheet 1-0-1 having a conductive layer as shown in FIG. 1 is a partial sectional view showing an example of a transparent resistive sheet having an anisotropic conductive layer according to the present invention. Indium oxide and tin oxide formed on a transparent glass plate 1 (JS lower I)
- A transparent matrix layer 3 is formed by closely adhering to the thin film 2 (transparent resistive film) (marked as 〇), in which a large number of conductive short fibers pass through the matrix layer to the surface of the matrix layer. exposed to.

The transparent resistive sheet used here is obtained by forming a thin film of a conductive metal or metal oxide on a transparent glass or plastic film by vapor deposition, sputtering, or other known techniques. The curved shape is made by forming a thin film of tin oxide and a small amount of indium oxide on glass. The resistance value of the thin film is not particularly limited, but for input devices it is 50
~1000 ohm/SQ is preferably used.

Further, it is preferable that the visible light transmittance of the transparent resistance sheet is 40% or more.

Formation of transparent anisotropic conductive layer 71 to 6 1, 1 M
``1 has a fluidity at the raw material stage, and it is hard and transparent (771 helix is formed by chemical hardening, cooling solidification, etc.). It does not need to be a solid insulator, and in terms of sheet resistance, it only needs to be 100 times or more that of a transparent resistive film, and usually 1 mechaum/Sq is sufficient.Epoxy, acrylic, monopolymer polyester, low melting point glass, etc. organic, inorganic,
Various compositions are used, including elastic hardening type and thermoplastic 1/l, but epoxy type is particularly excellent. The thickness of the matrix layer is preferably 1 mm or less, particularly 0.1 mm.
A range from Q to 5 mm is preferably used.

The conductive short fibers used for this are nickel, cobalt,
It is made of various magnetic metals or alloys, including iron and some types of stainless steel. Alternatively, a composite material of these metals and a non-magnetic ↑/i'vI material may be used. Examples of this type of material include glass fibers and carbon fibers whose surfaces are plated with nickel. These yr1 fibers are sometimes coated with thin rod metals such as gold, silver, copper, and tin to enhance their chemical or electrical properties. The diameter of the short fibers is Q, 1 mm or less, more preferably 0.
An extremely thin one of 0.3 mm or less is used. The dense planting density of short fibers is 10 per square IT1m for completely penetrated fibers.
This is preferred.

The anisotropic conductive layer is made by casting a liquid matrix stock solution kneaded with conductive short fibers onto the resistive film surface of a transparent resistive sheet, covering the surface with a peelable material, and then using a magnetic field to separate the short fibers perpendicular to the surface. The matrix is hardened or solidified while maintaining its orientation.1! Afterwards, the cover is removed and the surface is polished or ground as necessary. In order to improve adhesion ↑4 to the resistive sheet, the surface of the resistive film may be subjected to surface treatment such as organic titanate, vinyl silane, alkali, acid, or low-temperature plasma treatment in advance.

-〇- The transparency t/l of the composite as a whole is desirably 30% or more in terms of visible light transmittance. Further, it is preferable that the value calculated by the following formula is 80% or less.

Haze value - (diffuse light transmittance/diffuse light transmittance)
An epoxy stock solution made from 0 parts and 24 parts of isofcalonediamine has a diameter of 12 microns, an average length of 0° and 53 mm, and a length <trv deviation o, o'+ mm(r)vA'.
I added 16 0.6 mm thick picture frame-shaped spacers around the periphery of = B with 1.5 mm stainless steel short fibers added.
It was covered with a polyimide film that had been IJ casted with 19 f/5 mm and subjected to mold release treatment on a T O type transparent conductive plate glass.
0 fiber navy blue oriented in the thickness direction! 130℃, 3
0 minutes, heat to harden the epoxy 1! Ta. Remove the cover film and thin the L-1-9 layer to a thickness of 0.5 mm.
After 1 polishing, I polished 4) 1 more until the mirror surface was polished. 1! It was observed that the burned composite body was substantially transparent, and half of the buried short fibers were in contact with the I-O membrane. The resistance value between any two points measured through the transparent anisotropic conductive layer using the conductive rubber as an electrode was almost the same as the value of the raw material conductive plate glass, and it was confirmed that the resistance could be input to the resistive film through the short fibers.

[Effect of the Invention 1] According to the present invention, it was possible to obtain a transparent input device whose resistive film is not damaged even when input is directly made with a power injection pen.

Moreover, even after long-term use, it was able to provide a positive Mc response and was highly durable.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of one embodiment of a transparent conductive composite according to the present invention. 1; Transparent plate glass 2: Transparent resistive thin film formed on plate glass 3; Transparent 4\matrix layer

Claims (5)

[Claims] (1) A sheet consisting of a transparent sheet-like base material and a transparent anisotropically conductive layer, in which a transparent electrically resistive film is formed on the surface layer of the sheet-like base material on the anisotropically conductive layer side. The conductive layer is characterized in that a large number of conductive short fibers are oriented in the thickness direction in a transparent hard insulating layer, and the sheet-like base material and the anisotropic conductive layer are tightly bonded and integrated. A transparent resistance sheet having a conductive layer. (2) A transparent resistance sheet having a conductive layer according to claim (1), wherein the sheet-like base material is glass or a plastic film. (3) A transparent resistive sheet having a conductive layer according to claim 1, wherein the electrically resistive film is a film made of a metal or a metal oxide. (4) Claim (3) characterized in that the metal or metal oxide consists of indium oxide and tin oxide.
A transparent resistance sheet having a conductive layer as described in 1. (5) A transparent resistance sheet having a conductive layer according to claim (1), wherein the conductive short fibers are magnetic metal fibers.