JPH05257591A - Resistance film type input unit - Google Patents

Abstract

PURPOSE:To detect more than two depression points which are almost equivalent to each other, on the resistance film type input unit. CONSTITUTION:The system is provided with a coordinate value detection means 31 having whole resistance films 19 and 20 faced each other and a depression detection means 33 having resistance films 21 and 22 partially faced each other in many sections. The whole resistance films 19 and 20 of the coordinate value detection means and the partially faced each other resistance films of depression detection means 33 are placed to be depressed simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistive film type input device used in, for example, a pen input device.

[0002]

2. Description of the Related Art In recent computers, in addition to a keyboard input device, other input devices such as a pen input device are often used. A pen input device may use a resistance film type input device that detects a coordinate value by pressing a resistance film. The resistance film type input device is provided with a full resistance film on each of the opposing surfaces of a pair of insulating sheets, keeps the whole resistance film from contacting with a spacer, and pushes down the whole resistance film with a pen or the like. The coordinate values can be detected by contacting them.

FIG. 7 is a diagram showing an example of such a resistance film type input device. The first resistance film 1 and the second resistance film 2 are arranged so as to face each other with a minute interval, and a pair of electrodes 3, 4 and 5, respectively, are provided at both ends of the first and second resistance films 1 and 2, respectively. 6
Can be installed. The electrodes 3 and 4 of the first resistance film 1 are connected to the constant current source 7, and the electrodes 5 and 6 of the second resistance film 2 are grounded. Here, for example, when the point P is pressed, the first and second resistance films 1 and 2 come into contact at the point P, and the constant current source 7
A current flows from the first resistance film 1, the contact P point, the second resistance film 2, and the ground point. The x-coordinate corresponding to the distance from the electrode 3 of the first resistance film 1 to the contact point P can be detected by, for example, measuring the current passing through the electrode 3 with a galvanometer 8, and the x-coordinate of the second resistance film 2 can be detected. The y coordinate corresponding to the distance from the electrode 5 to the contact point P can be detected by measuring the current passing through the electrode 5 with a galvanometer 9, for example.

[0004]

In such a resistive film type input device, for example, when two points A and B are pressed almost simultaneously as shown in FIG. 8, the two points A and B are distinguished. However, there is a problem in that the position of the point C corresponding to the average value of the detected current values of the two points A and B is output. Therefore, when drawing a figure using such a resistance film type input device, there is a possibility that a figure different from the one intended by the user may be drawn.

Further, in a display input device capable of inputting with a pen on the display screen, the user inputs the desired coordinate value information by pressing down on the display screen with the pen. While inputting with, there was a case that other places were pressed at the same time due to the trouble. In such a case, as described above, the resistive film type input device cannot identify whether or not two points have been pressed, so the average position of the two pressed points is read. However, there is an inconvenience that a coordinate value corresponding to such a non-pressed position is input.

An object of the present invention is to provide a resistance film type input device capable of detecting pressing of two or more points at substantially the same time.

[0007]

A resistance film type input device according to the present invention comprises a coordinate value detecting means 31 having opposed whole surface resistance films 19 and 20, and resistance films 21 and 22 partially opposed at a plurality of portions. It is characterized in that the entire surface resistance film facing the coordinate value detecting means and the resistance film partially facing the pressing detection means are arranged so as to be simultaneously pressed.

[0008]

According to the above construction, the coordinate value detecting means having the opposing whole surface resistance film can detect the coordinate value as described with reference to FIG. 7, for example. Since the resistance films of the pressing detection means partially oppose each other at a plurality of portions, it is possible to detect pressing at two or more points. Therefore, when two or more depressions are detected by the depression detecting means, the detection of the coordinate value detecting means can be invalidated and the detection can be performed again.

[0009]

FIG. 5 is a view showing a display input device incorporating the resistive film type input device of the present invention. This display input device has a key row 10, 1 similar to a keyboard.
1 and further has a display screen 12. An item selection touch switch 13 is provided around the display screen 12, and the display on the display screen 12 can be set by the selected touch switch 13.
The display screen 12 is divided into some sections, for example, as shown by a chain line, and an arbitrary display is made for each section. Each section can be manually pressed to input desired information.

As shown in FIG. 6, the display screen 12 has a resistive film type input device 15 on a display panel 14 composed of a plasma display or a liquid crystal display.
Is arranged. Resistive film type input device 15
In the embodiment of the present invention, the three insulating sheets 16, 17,
18 is provided with a resistance film. Since these insulating sheets 16, 17, 18 and the resistance film are transparent, the image of the display panel 14 can be seen through them.

Referring to FIG. 2, a resistance film type input device 15 is provided.
Then, the overall resistance film 19 is provided on the inner surface of the first insulating sheet 16, and the overall resistance film 20 is provided on the side of the second insulating sheet 17 that faces the overall resistance film 19, to form the coordinate value detecting means. The overall resistance film 19 corresponds to the first resistance film 1 in FIG. 7, and the overall resistance film 20 corresponds to the second resistance film 2. Figure 2
In addition, a partial resistance film 21 is provided on the side of the second insulating sheet 17 opposite to the whole resistance film 20, and a partial resistance film 22 is provided on the side of the third insulating sheet 18 facing the partial resistance film 21. And constitutes a press detection means. Minute spacers 23 are arranged between the entire surface resistance films 219 and 20 of the coordinate value detecting means and between the partial resistance films 21 and 22 of the depression detecting means, and these resistance films are in contact with each other in a normal state. Try not to. As shown in FIG. 3, when the pen or the finger 25 is pressed down, the entire surface resistance films 219 and 20 of the coordinate value detecting means are brought into contact with each other, and the partial resistance films 21 and 22 of the press down detecting means are brought into contact with each other. To do.

Referring to FIG. 1, the first insulating sheet 16
A pair of electrodes 26 and 27 are provided at both ends of the full-surface resistance film 19 of FIG. 2, and a pair of electrodes 28 and 29 are provided perpendicularly to the electrodes 26 and 27 at both ends of the full-screen resistance film 20 of the second insulating sheet 17. .. These electrodes 26, 27, 28 and 29 are shown in FIG.
Of the electrodes 3, 4, 5 and 6. These electrodes 26,
Reference numerals 27, 28, and 29 denote the XY coordinate value detection circuit 3 by the line 30.
Connected to 1. The XY coordinate value detection circuit 31 includes the functions of the constant current source, the grounding section, and the galvanometer shown in FIG. 7, and can detect the XY coordinate values according to the above description.

The partial resistance film 21 of the second insulating sheet 17 is a plurality of small strip-shaped resistance films, and the partial resistance film 22 of the third insulating sheet 18 is also a plurality of small strip-shaped resistance films. .. These partial resistance films 21 and 22 are arranged in a matrix so as to be orthogonal to each other. Each of the partial resistance films 21 and 22 is connected to the depression detection circuit 33 by a line 32. The XY coordinate value detection circuit 31 and the press detection circuit 33 are connected to a microcomputer (MPU) 34, and the microcomputer (MPU) 34 is connected to an interface (I
/ F) 35 and is connected to a storage device (not shown) and other devices. Further, a buzzer 36 is provided, and a buzzer sound is emitted when the depression detection circuit 33 detects depression of two or more points.

FIG. 4 shows a microcomputer (MPU) 3
14 is a flowchart mainly showing an operation of the press detection circuit 33 in the process of 4. This process is repeated in a cycle of every minute time unit. First in step 50,
By checking whether or not there is conduction between the partial resistance films 21 and 22, it is checked whether or not there is a depression.
If the answer is no, the process is terminated. If the answer is yes, the process proceeds to step 51, and the depression detection partial resistance films 21 and 22 are operated. That is, a plurality of partial resistance films 21 and 2 in a matrix form.
Check for continuity at each intersection of 2. If no, the process proceeds to step 53, and the coordinate values of the X and Y positions pressed by the XY coordinate value detection circuit 31 are obtained. The details of this processing are as described with reference to FIG. 7. Next, in step 54, the obtained coordinate data is transferred to the storage device via the interface (I / F) 35. The obtained coordinate data is further processed in various ways.
If YES in step 52, the flow advances to step 55 to invalidate the X and Y position detection. That is,
The pressed position is not calculated in the XY coordinate value detection circuit 31. Further proceeding to step 56, the buzzer 36 is sounded to inform the user that the X, Y position detection has been disabled, and prompt the user to press it again.

[0015]

As described above, since the resistance film type input device according to the present invention can detect the pressing of two or more substantially equal points, the reliability of the XY coordinate value detection can be improved.
The range of applications can be expanded.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

2 is a cross-sectional view of the resistance film of FIG.

FIG. 3 is a diagram showing a case where the button of FIG. 2 is pressed.

FIG. 4 is a flowchart showing an operation of a press detection circuit.

FIG. 5 is a diagram showing a display input device using the present invention.

FIG. 6 is an exploded perspective view of a part of FIG.

FIG. 7 is a diagram showing the principle of a resistance film type input device.

FIG. 8 is a diagram showing a problem of the conventional technique.

[Explanation of symbols]

 16, 17, 18 ... Insulating sheet 19, 20 ... Overall resistance film 21, 22 ... Partial resistance film

Claims (3)

[Claims] 1. A coordinate value detecting means (31) having opposing whole-surface resistance films (19, 20) and a press-down detecting means (33) having resistance films (21, 22) partially opposed to each other at a plurality of portions. A resistance film type input device, comprising: an entire resistance film facing the coordinate value detecting means and a resistance film partially facing the pressing detection means so that they can be pressed simultaneously. 2. The opposing overall resistance films are provided on the first and second insulating sheets, respectively, and the partially opposing resistance films are one and the third insulating sheets of the first and second insulating sheets, respectively. The resistance film type input device according to claim 1, wherein the resistance film type input device is provided on a sheet. 3. The resistance film type input device according to claim 1, wherein the push-down detecting means detects whether or not two or more pushes have been made within a predetermined time.