JPH01243108A - Optical coordinates input element - Google Patents

Abstract

PURPOSE:To execute a high resolution by arranging strip electrodes for detecting coordinates in a condition not to be mutually parallel to plural lines of stripe electrodes on the other surface in sandwiching a film. CONSTITUTION:Plural lines of stripe electrodes for detecting the coordinates are arranged in the condition in which the mutual stripe electrodes are not parallel to plural lines of stripe electrodes for detecting the coordinates formed on the other surface in sandwiching the film made of a material in which a characteristic such as the change of a resistivity is changed. Plural lines of stripe electrodes for detecting the coordinates may be formed on a substrate, and they may be directly formed on the film made of the material to be characteristic-changed by a light detection. Consequently, the stripe electrode can be made fine through the use of a technique such as an etching, and it can be formed as a fine pattern. Thus, the high resolution can be executed, and the execution of a large area can be also facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coordinate input element used in a coordinate input device, and particularly to an optical coordinate input element.

(Prior Art) A coordinate input device is used as a peripheral device for a computer, etc. in order to input image data, two-dimensional coordinate data, etc. into an information processing device such as a computer. A device using this has been developed.

For example, (^) an electromagnetic induction method in which a magnetic field is applied by a coil on orthogonal wire electrodes, the generated signal is read and coordinates are detected; (B) pressure is applied to the upper electrode of a pair of orthogonal wire electrodes, and the lower (C) A non-scanning position sensor that detects the position by dividing the optical output current with a surface resistance layer using a flat silicon diode, etc., and (D)
) There is a photoelectric type that detects a position by blocking light by combining an LED array and a light-receiving element array in a matrix. Many other human-powered devices such as electrostatic induction type and ultrasonic type have been devised.

(Problems to be Solved by the Invention) The conventional coordinate input device described above has various problems. In (^), in order to improve the resolution, 2
The density of the set of orthogonal wire electrodes must be increased, which complicates the structure and increases cost. Furthermore, the current induced in the wire-shaped electrode requires analog analysis, which complicates the electronic circuit.Furthermore, since a magnetic field is used, there are problems in that it does not adversely affect other local parts, such as magnetic recording media. It has points. In (II) and (D) as well, in order to improve the resolution, it is necessary to increase the density of wire electrode pairs, LED arrays, and photodetector arrays, resulting in a problem that the structure becomes complicated. have. In (C), the precision is determined by the precision of the surface resistance layer, and when high precision is required, non-uniformity of the surface resistance layer becomes a problem, making it difficult to increase the area.

(Means for Solving the Problems) The present invention aims to improve accuracy by preventing the structure from becoming complicated due to higher resolution, which is a problem in coordinate input devices, and solves the problems associated with other methods. This is a coordinate input element that is a skeletal element of an input device. That is, in the present invention, a plurality of striped electrodes for coordinate detection formed on one surface are sandwiched between a film made of a material that detects light and whose characteristics such as changes in resistivity change. This is an optical coordinate input element characterized in that a plurality of striped electrodes for coordinate detection are formed on the substrate, and the striped electrodes are arranged in a non-parallel manner.

The plurality of striped electrodes for coordinate detection formed on one surface of the present invention may be formed on a substrate, or may be formed directly on a film made of a material whose characteristics change due to light detection. It's good.

The substrate is preferably transparent or semi-transparent, and furthermore, striped electrodes arranged on the top and bottom (or left and right) with a film made of a material whose characteristics change due to light detection are used as the substrate. When the substrate is formed on a transparent or semi-transparent substrate, at least one of the substrates must be transparent or translucent.

In addition, the striped electrode in the present invention is one in which a plurality of electrodes are formed in a thin strip, each of which is substantially parallel to each other, and a plurality of electrodes are formed in a single plane so that they are substantially parallel to each other. It may be formed in a striped shape (comb tooth shape), or it may be formed in a plurality of the same circular shape. In addition, the structure is not limited to the above (a plurality of electrodes arranged at regular intervals may be formed in a striped pattern). It is necessary that the electrodes be arranged in a non-parallel manner.

The material forming the striped electrodes is not particularly limited, but must have appropriate conductivity. The electrodes arranged vertically (or horizontally) that are not substantially parallel may be made of the same material or may be made of different materials.

It is preferable that these electrodes are transparent or semi-transparent while being formed as striped electrodes. In particular, the electrode on the light entrance side needs to be at least transparent or semitransparent.

The striped electrode of the present invention can be made finer using techniques such as etching, and can be formed into a fine pattern. Therefore, high resolution is possible, and it is easy to increase the area.

In the optical coordinate input device using the optical coordinate input element of the present invention, if necessary, the incident light is modulated or an optical filter is provided in the light receiving part of the device to reduce disturbance noise. You may. Further, an electrode sweeping circuit, an output current amplification amplifier, or other processing circuit may be provided on the substrate. If you need more,
A liquid crystal or other display device integrated with the element of the present invention may be combined.

(Example) Using a glass substrate with ITO film formed on one side, this ITO
By photo-etching, a fine striped pattern is formed. This surface-based amorphous silicon is deposited using the CDV method, and further, on top of it,
A film of ITO was formed using a snotering method, and a pattern was formed by photo-soching so that it was perpendicular to the lower ITO striped thin line pattern.The 7-inch turn of the thin line was used as the upper electrode and the lower electrode. Both were made with a pitch of 50 μm, with a line length of 30 μm and a line spacing of 20 μm, and 10 cvb.
The sensing area was 8 cm x 8 cm square on the x 10c-square substrate. Also, the incident light that indicates the position is
A light emitting diode with a center wavelength of 660 nm was used, and modulation was applied at a frequency of 5 KHz. A red filter was placed above the light receiving part of the element to reduce disturbance light.

The output signal from the element is output to a computer as coordinate data through a peak detection circuit.

FIG. 2 shows the structure of the fabricated device, and FIG. 3 shows a block diagram including the external electronic circuit. When coordinates were input using this element, a high resolution of 0.05 ram was obtained.

(Effects of the Invention) In the present invention, since the material for the electrode can be manufactured using techniques such as etching, high resolution can be easily achieved. Further, the material inserted between the electrodes may be any photoelectric material, and has the advantage that there are no restrictions on material or manufacturing method.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the configuration of an element of the present invention, and FIG. 2 is a diagram of the configuration of the same element manufactured in Example 1. FIG. 3 shows a block diagram when position detection is performed using the same element. Patent applicant: Toyobo Co., Ltd. Yume 1 Figure 1 Upper tone 75<tJ← 2 Photoelectric material 3 4P comb-shaped electrode 4 substrate W-2 Figure 41 Mol 77S silicon 5゛ITO old 5: 1 person゛q and book Min 6 o I ↓ j protection # j ¥, 3 Fig. 1, main firing B number 2, X # sweep circuit 3° Y-axis output multi-center each 4; Ta

Claims (1)

[Claims] 1. A plurality of striped electrodes for coordinate detection are formed on one surface, sandwiching a film made of a material that detects light and changes characteristics such as changes in resistivity, and is formed on the other surface. 1. An optical coordinate input element comprising: a plurality of striped electrodes for detecting coordinates; and the striped electrodes are arranged in a non-parallel manner.