JPS6237728A - Coordinate input device - Google Patents

Abstract

PURPOSE:To improve the reliability and also to attain the soft touch operations with a simple constitution by fixing a magnetic substance close to the periphery of a resistance sheet and at the same time surrounding said magnetic substance with another magnetic substance fixed to a rigid substrate. CONSTITUTION:A movable magnetic substance is fixed close to the periphery of a resistance sheet 2 covered with a protecting sheet. This movable magnetic substance is surrounded with a magnetic matter 3 fixed to a rigid substance 4. The movable magnetic substance which is shifted when the input of coordinates is carried out by pushing the sheet 2 with a finger 5 is reset to its original position via the substance 3. This prevents the sag of the sheet 2. In such a constitution, the reliability is improved and also the soft touch operations are possible with a coordinate input device.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a coordinate input device used for inputting image information such as handwritten characters and figures into a computer or transmitting images to a remote location. .

BACKGROUND OF THE INVENTION These coordinate input devices have a structure in which two resistive sheets having uniform electrodes at both ends face each other with a constant distance between them. Now, when an input is made from the input surface with a finger or other writing tool, the upper and lower resistive sheets are brought into contact and conduction due to the suppression, and a current flows through the electrodes at both ends at a resistance ratio corresponding to the input position. By detecting the current at this time, a coordinate position signal can be obtained. Using the above principle, various spacers have been studied so far as means for maintaining a constant distance between two resistance sheets. There are three typical conventional methods as follows. That is, one using the fixed frame spacer shown in Fig. 3 (Japanese Patent Laid-Open No. 11580/1983)
, one in which a dot spacer is formed between the resistor sheets as shown in Fig. 4 (US Pat. No. 3,911,215), and one in which a pressure-sensitive conductive rubber sheet is sandwiched between the resistor sheets as a spacer as shown in Fig. 6 ( (Japanese Patent Application Laid-Open No. 55-74669)
It is.

Problems to be Solved by the Invention However, the above configurations each have the following problems. First, fixed frame spacers are simple and effective as inexpensive spacers, but because they cannot absorb the slack of the film on the input surface side, during long-term use, The film stretches and the upper and lower films contact each other at the center and conduct.

That is, the reliability in terms of life is poor. Next, the method of forming a dot spacer is simple and inexpensive, but since the dot spacer itself is insulating, an input blind spot is created around it, making it unsuitable for high-resolution coordinate input devices. It is.

With the pressure-sensitive conductive rubber sheet method, the sensitivity of the device depends on the sensitivity of the pressure-sensitive conductive rubber sheet itself, so input is only possible with a writing instrument with a thin tip, and soft-touch manual input using fingertips is not possible. However, the sheet is very expensive. In view of the above problems, the present invention provides a coordinate input device that has a simple configuration, is highly reliable, is inexpensive, and allows soft touch input using a finger.

Means for Solving the Problems In order to solve the above problems, the coordinate input device of the present invention has the same configuration as a first resistance sheet having parallel strip electrodes at both ends, and the electrodes of the first resistance sheet A magnetic material is closely fixed around the flexible resistance sort on the input surface side, and the opposite rigid substrate A magnetic material is formed on the resistive sheet so as to surround the magnetic material fixed to the resistance sheet.

Effect: With the above-described configuration, the magnetic material fixed around the upper resistance sheet and the magnetic material fixed to the spacer located outside the upper resistance sheet are attracted to each other by mutual polar attraction, so that the resistance sheet is always maintained. This makes it possible to maintain an appropriate amount of tension and prevent sagging on the input surface side.

Embodiment Hereinafter, a coordinate input device according to an embodiment of the present invention will be described with reference to drawing -C1. FIG. 1 is a sectional view of one embodiment of the present invention. As shown in FIG. 1, the coordinate input device is composed of a resistive sheet 2 and a protective sheet 1 on a rigid substrate 4.

As shown in the figure, a magnetic material is tightly fixed around the resistance sheet 2, and a magnetic material is also formed on the rigid substrate in a similar manner. Note that the magnetic bodies have different polarities that correspond to each other, and an attractive force always acts on them. Still 3
The magnetic material shown by can freely slide in the vertical direction. FIG. 1 is a cross-sectional view when no power is applied, and the gap between the resistance sheets at this time is determined by the thickness of the magnetic material, indicated by e. Second
The figure is a cross-sectional view at the time of input. The top resistive sheet is under tension at the input point. Therefore, the magnetic material at the periphery is slid to the center. When the input is completed and the tension applied to the resistance sheet is removed, the magnetic body 3 is pulled back again by the attraction between the opposite polarities with the opposing magnetic body fixed to the rigid substrate. Therefore, the resistance sheet on the human-powered side is always maintained in a tensioned state, and the sagging of the sheet, which has conventionally been a problem with frame-shaped spacers, is absorbed by the tension from both ends of the sheet.

Effects of the Invention As described above, the present invention provides a second resistor having the same configuration as a first resistor sheet having strip-shaped electrodes parallel to each other at both ends, and having electrodes arranged perpendicularly to the electrodes of the first resistor sheet. As a means for the sheets to face each other at a constant interval, a magnetic material is closely fixed around the flexible resistance sheet on the input surface side, and a magnetic material fixed to the resistance sheet is placed on the opposite rigid substrate. By forming the magnetic material to surround the periphery, it is possible to provide a coordinate input device that has a simple configuration, is highly reliable, is inexpensive, and is capable of soft-touch input using a finger.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the coordinate input device of the present invention when it is unmanned, Fig. 2 is a cross-sectional view of the coordinate input device of the present invention when inputting with a finger, and Fig. 3 is a conventional example of fixed frame spacer type coordinate input. FIG. 4 is a cross-sectional view of a conventional dot spacer type coordinate input device, and FIG. 5 is a cross-sectional view of a conventional pressure-sensitive conductive rubber sheet type coordinate input device. 1...Protection/-t, 2...Resistance sheet, 3...
...Magnetic material, 4...Rigid substrate. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
m-old U Mamoru seat? -m-Saiminkeng Sheet

Claims (1)

[Claims] A second resistive sheet having the same configuration as the first resistive sheet having parallel strip electrodes at both ends and having electrodes arranged perpendicularly to the electrodes of the first resistive sheet faces each other at a constant distance. A magnetic material is closely fixed to the edge of a flexible resistance sheet on the input surface side, and a magnetic material is formed on the opposite rigid substrate in a manner surrounding the magnetic material fixed to the resistance sheet. A coordinate input device characterized by: