JPH01269120A - Touch panel input device - Google Patents

Abstract

PURPOSE:To detect the double pushing with the change of a current to flow at a first conducting sheet by supervising the change of the current to flow at the first conduction sheet to form a potential grade. CONSTITUTION:A touch panel to face first and second conducting sheets 1 and 2 at a fine interval is held, a potential grade is formed through a current to a first conducting sheet 1, when the touch panel is pushed down, the potential of the first conducting sheet 1 at the contact is detected by a second conducting sheet 2 and thus, a contacting position is calculated. In this case, current detecting means 8 and 9 to detect the current to flow at the first conducting sheet 1 are provided, the current detecting means 8 and 9 are referred to when the potential is detected from the second conducting sheet 2 and when the current is increased more than the ordinary one, a deciding means to judge that the touch panel is double-pushed down is provided. At the time of the double-pushing-down, since parallel lines 13 and 14 are formed between two pushed-down points, the resistance value between these is lowered and the current to flow as a whole is increased. By supervising this, the double pushing- down can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION (AL Industrial Field of Application) The present invention relates to a touch panel human-powered device that calculates press coordinates from the potential detected from one conductive sheet, and in particular, to double-press detection of such a touch panel input device. Regarding improvement of the method.

(b) Summary of the Invention In the touch panel input device according to the present invention, when the touch panel is pressed twice, a parallel line is formed between the two pressed points by the first and second conductive sheets. The overall resistance value decreases and the current flowing to form a potential gradient increases. Based on this, when the potential of the contact is detected, the current value is determined at the same time, and if the current value is increasing, it is determined that double pressing has occurred.

(C) Prior Art A conventional resistive film analog type touch panel input device is shown in FIG. A negative conductive sheet 1 and a second conductive sheet 2 are placed facing each other with a minute interval. A voltage is applied to the first conductive sheet via a diode 3.

This voltage is divided over the entire length of the sheet to form a potential gradient. The changeover switch 4 switches the detection in the horizontal direction (X coordinate) and the vertical direction (Y coordinate) by reversing the polarity of the leader line for voltage application. A voltmeter 5 is connected to the second conductive sheet 2 and reads the potential formed on the second conductive sheet at the pressed position (contact point) 7. At this time, the internal resistance of the voltmeter 5 is so large that it can be considered infinite, and the current flowing to the ground via the voltmeter can be regarded as O, and the resulting voltage drop can also be regarded as O. . Therefore, the potential divided at the contact point 7 in the first conductive sheet 1 is accurately detected by the voltmeter 5. An equivalent circuit in this state is shown in FIG. This voltage value is input to the microcomputer 6, and the microcomputer 6 calculates the coordinates of the contact point 7 based on the input voltage value.

(d) Problems to be Solved by the Invention However, when multiple points are pressed simultaneously (double pressed) in such a touch panel input device, the voltmeter 5 shows a value near the middle of the two pressed positions. Some analog potential is detected. For this reason, there is a drawback that not only is it impossible to determine the fact that a double press has occurred, but also a completely incorrect press position is determined based on the detected potential.

Therefore, when this touch panel input device is used in a device such as an automatic transaction processing device, there is a problem in that the reliability of the device is significantly reduced.

In view of these problems, it is an object of the present invention to provide a touch panel input device that can detect double presses by monitoring changes in the current flowing through the first conductive sheet to form a potential gradient. .

(e) Means for Solving the Problems This invention has a touch panel in which first and second conductive sheets are opposed to each other at a minute interval, and a potential gradient is formed by passing an electric current through the first conductive sheet. In a touch panel input device that calculates a contact position by detecting the potential of a first conductive sheet at this contact point with a second conductive sheet when the touch panel is pressed, the current flowing through the first conductive sheet is detected. A detection means is provided, and a determination means refers to the current detection means when a potential is detected from the second conductive sheet, and determines that the touch panel is being pressed twice when the current increases more than usual. It is characterized by having been provided.

(f) Function In the touch panel input device of the present invention, the contact position is calculated based on the potential formed on the second conductive sheet, similar to the conventional analog touch panel input device. At the same time as detecting the potential at the contact position, the current flowing through the first conductive sheet (current for forming a potential gradient) is measured.

Normally (when the touch panel is not pressed or
When only one point is pressed down), the current only flows through the first conductive sheet, but when double pressed, a parallel line is created between the two pressed points as shown in Figure 5. 13.
14 is formed, the resistance value during this period decreases, and the current flowing as a whole increases. By monitoring this, double pressing can be detected.

(g) Embodiment FIG. 1 is a diagram showing the configuration of a touch panel input device according to an embodiment of the present invention. In this figure, parts similar in configuration to those of the conventional touch panel input device (FIG. 3) described above are given the same numerals and explanations will be omitted. In this figure, an ammeter 8 is inserted between a diode 3 that supplies voltage to the first conductive sheet 1 and a changeover switch 4.

This ammeter 8 measures the current for forming a potential gradient in the first conductive sheet 1. The detected value of the ammeter 8 is the converter 9
The data is converted into a format readable by the microcomputer 6 and input to the microcomputer 6.

FIG. 2 is a flowchart showing the operation of the microcomputer 6. At nl, it is determined whether a detected potential value is input from the voltmeter 5 or not. If there is no input, the selector switch is switched at n5 and the process returns to n1 again. Also, when a detected potential value is input, but the current value detected by the ammeter 8 is higher than normal (n2), it is determined that the button has been pressed twice and this detected value is invalidated. Proceed to n5.

If the detected potential value is input and there is no change in the current value at this time, it is assumed that one point has been pressed correctly, and the contact position is calculated based on this detected value (n3).
. Output this calculated value to another control unit (ATM input control unit, etc.) (n4), change the changeover switch (n5)
Return to l. By switching the changeover switch with n5 (X.

Y) Coordinate values can be measured.

Ammeter 8. The converter 9 corresponds to the current detection means of the present invention, and n2 corresponds to the determination means of the present invention. (h) Effects of the Invention As described above, according to the touch panel input device of the present invention, the first conductive sheet Since double presses can be detected by changes in the flowing current, it is possible to prevent false detections due to double presses and malfunctions of the device due to false detections. Thereby, the reliability of devices such as ATMs to which this touch panel input device is attached can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a touch panel input device according to an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the microcomputer of the same touch panel input device, and FIG. 3 is a schematic configuration diagram of a conventional touch panel input device. FIG. 4 is an equivalent circuit when one point on the touch panel input device is pressed, and FIG. 5 is a diagram illustrating parallel lines formed when the touch panel input device is pressed twice. 1-first conductive sheet, 2-second conductive sheet, 8-ammeter, 9-conversion circuit.

Claims (1)

[Claims] (1) It has a touch panel in which first and second conductive sheets are opposed to each other at a minute interval, and a potential gradient is formed by passing a current through the first conductive sheet, and when the touch panel is pressed, the A touch panel input device that calculates a pressed position by detecting the potential of a conductive sheet with a second conductive sheet, the touch panel input device comprising: a current detection means for detecting a current flowing through the first conductive sheet; 1. A touch panel input device comprising: a determining means that refers to the current detecting means when detecting a potential from the touch panel, and determines that the touch panel is being pressed twice when the current is higher than normal.