JPS61275924A - Coordinate inputting device - Google Patents

Abstract

PURPOSE:To make the pen input or the like and the finger touch input or the like possible on the same input face by constituting a device with the first transparent input board and the second transparent input board and putting them one over the other. CONSTITUTION:A transparent resistance sheet 130 where an SnO2 and an ITO are formed on the front face of a flexible sheet is put on a transparent resistance sheet 120 where an SnO2 and an ITO are formed on both faces of a flexible sheet. Detecting electrodes 1a-1d are connected to a transparent resistance film 121, and detecting electrodes 2a-2d are connected to a transparent resistance film 101. When depression is applied to the upper face of the transparent resistance sheet 130, a transparent pressure-sensitive sheet 110 is made conductive in the thickness direction only if the depression pressure applied to a unit area is high because of the use of a pen or the like, but the transparent pressure-sensitive sheet 110 is not made conductive in the thickness direction if the depression pressure applied to the unit area is low because of the use of a finger or the like.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a coordinate input device K called a tab knot, and relates to a transparent coordinate input device that can be used by laying it on a surface such as a display surface. be.

[Conventional technology]

Various types of coordinate input devices (tab knots) have been put into practical use depending on the input position detection method, such as a combination type, a resistance type, and an electromagnetic induction type.

Furthermore, devices with transparent input surfaces have also been put into practical use.

[Problem that the invention seeks to solve]

Do these conventional coordinate input devices use the same input surface? make use of,
At times, it was not possible to draw figures or characters using pen input, and at other times it was not possible to input items using finger touch input, and there were problems in terms of operability on the man-machine interface.

The present invention was made to solve these drawbacks, and an object of the present invention is to provide a coordinate input device that allows pen input, finger touch input, etc. using the same input surface.

[Means for solving problems]

The coordinate input device according to the present invention includes a first transparent input panel that detects the point of action when an external force is applied, and a first transparent input panel that detects the point of action when an external force that is larger per unit area than the above external force is applied. It consists of a second transparent input panel that
The first transparent input board is placed over the second transparent input board.

[Effect]

In this invention, when an external force is applied to the first transparent input panel with a finger or the like, the position of the point of application of the force is detected by the first transparent input panel. Furthermore, when an external force is applied to the first transparent input panel using a pen or the like, the input is also applied to the second transparent input panel via the first transparent input panel, and the position of the point of application of the force is changed to the second transparent input panel. Detected by transparent input panel.

〔Example〕

FIG. 1 shows an embodiment of the transparent input panel of the present invention.
00 is a transparent substrate made of glass or plastic, 101 is a 5nO1 or IT (transparent resistive film formed on the surface of the substrate 1000, 1)0 is a transparent pressure sensitive sheet), and 120 is a KB number or ITO on both sides of a transparent sheet. The transparent resistance sheet 121 is the transparent resistance sheet 12 formed with ltI.
Transparent resistive film of 5n01 and ITO formed on the 0 side, 122
13 is a transparent resistive film (Fig. 2) also formed on the bottom surface.
G is a transparent resistor sheet formed with 5n02 or ITOY on the surface of a flexible sheet), 131 is this transparent resistor sheet 1
A transparent resistive film of SnO or ITO formed on the back side of 30 (
2), 1a, lb, 1c, and 1d are detection electrodes 2a, 2b connected to the transparent resistive film 121 and used to uniformly flow out the AL flow flowing into the transparent resistive film 121 from the entire area of each side. ,
2c and 2d are detection electrodes connected to the transparent resistive film 101 to uniformly flow the current flowing into the transparent resistive film 101 from all sides. In addition.

1, [is the first. A second transparent input panel is shown, which is more clearly illustrated in FIG. 2, discussed below.

FIG. 2 is a sectional view taken along the line A-A' of the input surface shown in FIG.
, 1d are connected, and the detection electrode 2 is connected to the transparent resistive film 101.
an 2 b, 2 (!l 2 d) are connected. Note that the diode connected to each detection electrode is to prevent the flowing current from flowing back into the transparent paper-resistance film 101 and 121. .

When pressure is applied to the input surface (the top surface of the transparent resistance sheet 130), only when the pressure applied to a unit area is large, such as with a pen, the transparent pressure-sensitive sheet 1) 0 moves in the floating direction. The transparent pressure-sensitive sheet 1) 0 is constructed so as not to be conductive in the thickness direction when the pressing force applied to the unit area is small, like a finger. Note that the second transparent input panel 1. The circuit part is omitted from fi.

The above-mentioned transparent pressure-sensitive sheet 1) G is a sheet that becomes electrically conductive in the thickness direction when a pressure of a certain value or more is applied. It can be made using the following method.

Figure 3 shows another example of the transparent input panel shown in Figure 2.
Reference numeral 123 denotes a conductor for electrically connecting the transparent resistive films 121 and 122, and the rest is the same as in FIG. 2.

The wJA diagram is the 1. This figure shows the configuration of the first embodiment of the mark input device configured using the second transparent human power ml, fi'.

In this figure, reference numeral 3 denotes a power source (DC power source) connected to the transparent resistive film 131 formed on the transparent resistive sheet 130 for flowing current. Each detection electrode 1m.

1b, 1c, 1d are detection resistors 6a, 6b+, respectively.
After passing 7m and 7by, the detection electrodes facing each other 1m and 1
b, 1c and Id, and are grounded via detection resistors 6C and 7C and switches 6d and TdY.

The detection resistors 6& and 6b and 7a and rb have the same resistance value. In addition, each of the above detection resistors 6m, 6b, 6
c, 7m, 7b, and 7e are operational amplifiers 87, 88, and 89 for detecting the voltage drop of each detection resistor.
90, 91, and 92 are connected. Note that the operational amplifiers 8B and 91 are for detecting a finger touch.

Further, the configuration is such that the voltage values detected by the operational amplifiers 87, 89, 90, 92 are output through the sample hold circuit #1I205.206°207.208.

Note that the sample and hold circuits 205 and 206 perform a sample and hold operation when the switch 6a is closed, while the sample and hold circuits 207 and 208 perform a sample and hold operation when the switch 7d is closed. As a result, the 1ltl input surface input suppression position t is configured to be detected separately in the X-axis direction and the Y-axis direction. Similarly, each of the detection electrodes 2m, 2be 2 e+
2d is each detection resistor 4m+4b*5
Detection electrodes 2a+ 2b facing each other via a, 5b'v
and connected every 2c, 2d, detection resistors 4c, 5c
and is grounded via switches 4d and 5dt'. In addition, each of the above detection wheels ゛Resistance 4m+ 4b+ 4c+ Sat 5b+
5c includes an operational amplifier 81.82.83.84.85.8 for detecting the voltage drop of each detection resistor.
6 is connected. In addition, the detection resistors 4a and 4b
and 5a and 5b have the same resistance value.

Note that the operational amplifiers 82 and 85 are for detecting the presence of a bend touch.

In addition, the voltage 1st cycle detected by the operational amplifiers 81.83 and 84.86 is transferred to the sample and hold circuit 201°202.20.
3. The sample and hold circuit 201゜2021Switch 4 is configured to be output via 204.
The sample and hold circuits 203 and 204 perform a sample and hold operation when the switch d is closed.
A sample operation is performed when d is closed. The configuration is such that the pressed position t on the narrower human force surface is detected separately in the X-axis direction and the Y-axis direction. The switches 4d and 6d are closed and opened at the same time, the switches 5d and 7d are closed and opened at the same time, and when the switches 6d and 4d are closed, the switches 5d and 7d are opened.

With this configuration, when an arbitrary position on the input surface is pressed with a finger, the transparent resistive film 12 is pressed at this pressed position.
1 and the transparent resistive film 131 become short-circuited. Here, if the switch 7d is closed, the current from the power source 3 passes through the transparent resistive film 121 to the detection electrodes 1a and 1b.
and flows to sensing resistors 71.7b, 7c. Then, a voltage drop occurs at the detection resistors 7a, 7b, and 7c.

It is detected by operational amplifiers 90, 91.92 and held by sample and hold circuit 2G7.208. In addition, the voltage drop detected by the operational amplifier 91 becomes finger touch No. 48,
This finger touch signal causes sample and hold circuit 207.
A sampling pulse is input to 208 . Furthermore, the ratio of the currents flowing through the detection resistors 7m+7b corresponds to the resistance ratio of the transparent resistive film 121 corresponding to the suppression position. Therefore, the ratio of the voltage drops across the detection resistors 7a and 7b detected by the operational amplifiers 90 and 92 and held by the sample and hold circuits 207 and 201) indicates the coordinate position in the X direction of the pressed position on the input surface. Become.

Next, when the switch 7dY is opened and the switch 6dz' is closed, the current from the power supply 3 flows through the detection resistors 6m+6b, 6cK.
current, sense resistor 6a as above.

6b is detected as the Y-direction coordinate position of the suppression position.

Next, if you press an arbitrary position on the input surface with an input tool such as a pen that applies a large amount of pressure per unit area.

At this pressed position, transparent resistor [121 and transparent resistive film 1]
31 is short-circuited. Furthermore, in this case, the transparent pressure-sensitive sheet 1) is conductive in the thickness direction.

The transparent resistive film 122 and the transparent resistive film 101 become short-circuited.

Here, assuming that the switch 5d is closed,
A current from the power source 3 flows through the transparent resistive film 131.121° conductor 123. Transparent resistive film 122. Detection resistor 5a* via transparent pressure sensitive sheet 1)0 and transparent resistive film 101'Ik
5b and 5c, and the ratio of the voltage drops across the detection resistors 5a and 5b is detected as the X-direction coordinate position of the pressed position in the same manner as described above.

Next, when the switch 5dY is opened and the switch 4d is closed, the ratio of voltage drops across the detection resistors 4a and 4b is detected as the Y-direction coordinate position of the pressed position in the same manner as described above. In this case, the sensing resistors 6al sb and 6c, 7m
A voltage drop also occurs at +7b and 7c, but the voltage drop is detected by the operational amplifier 88 or 91, and it can be detected that there was a vent touch, so the sample and hold circuits 205, 206, 207 and 208 do not operate.

FIG. 5 shows a second embodiment of the present invention, and the structure of the input surface is the same as that of the first embodiment. In Figure 5, 31 is constant
It is a source. When an arbitrary position on the input surface is pressed with a finger, as in the first embodiment, if the switch 7d is closed, current flows through the detection resistors 7m, 7b, and 7c, causing a voltage drop. arise. Sense resistors 7a and 7b
The ratio of the voltage drop that occurs corresponds to the resistance ratio in the X direction of the transparent resistive film 131 corresponding to the suppressed position.

Note that since the sum of the currents flowing through the detection resistors 7m and 7bKfi is constant by the constant current source 31, the coordinate position of the suppression position in the X direction can be detected simply by detecting the voltage drop across the detection resistor 7m.

Next, when the switch 7dlk is opened and the switch 6dY is closed, the Y-direction coordinate position of the pressed position can be detected by simply detecting the voltage drop across the detection resistor 6& in the same manner as described above. Note that the operational amplifiers 88 and 91 are for detecting a finger touch, and only when this finger touch is detected, a sampling pulse is input to the sample and hold circuits 205 and 207 to perform a sample and hold operation.

Next, if the switch 5d is closed as in Example 1 above when pressed with an input device that applies a large pressing force to a unit area, such as a pen, at an arbitrary position on the input surface. , a current flows through the detection resistor 5C, a voltage drop occurs, and a bent touch can be detected.

When a bend touch is detected, switches 6d and 7d are opened. Further, the switch 4d is also opened.

In this case, the current from the constant current source 31 is applied to the detection resistor 5a.
and 5b, a voltage drop occurs. Therefore, by finding the ratio of the voltage drops across the detection resistors 5a and 5b, the ratio of the suppression position in the X direction can be found, and from this the coordinate position can be detected. Note that the sum of the currents flowing through the detection resistors 5a and 5b is:

Since the constant current is regulated by the constant current source 31, the position coordinate of the suppression position in the X direction can be detected by determining the voltage drop across the detection resistor 5a. Next, by opening the switch 5d and closing the switch 4dY, the position coordinate of the suppression position in the Y direction can be similarly detected from the voltage drop of the detection resistor 4a.

FIG. 6 shows a third embodiment of the present invention, and the structure of the input surface is the same as that of the first embodiment. switches 8d and 9d
The sample and hold circuit 2 shown in the second embodiment of FIG.
This is a switch for omitting 05 and 207',
When a voltage drop occurs across the detection resistor 5C or 4c, the operational amplifiers 81 and 84121 are switched. Hereinafter, the position coordinates can be detected in the same manner as in the second embodiment shown in FIG.

FIG. 7 shows a fourth embodiment of the present invention, in which %141 is a transparent pressure-sensitive sheet, and the other parts are the same as in FIG. 3. The transparent pressure-sensitive sheet 141 can be electrically connected in the thickness direction even when the force applied to a unit area is small compared to the transparent pressure-sensitive sheet 1)0. When force is applied, the transparent pressure-sensitive sheet 141 becomes conductive, and the transparent resistive films 131 and 121 are electrically connected at the portion where the force is applied.

In this case, the transparent pressure-sensitive sheet) 1) G does not conduct because the force acting on the cutting edge per unit area is small. Next, when an input is made to the input surface using a writing instrument such as a pen that exerts a large force on a unit area, the transparent pressure-sensitive sheet 141 and 1)0 become electrically connected in the drawing direction. Therefore, the transparent resistive films 131 and 121 and 122 and 101 are electrically connected at the input positions.

Regarding the coordinate detection circuit, see Figures 4, 5, and 6.
The diagram can be used as is, so the explanation is omitted.
FIG. 8 shows a fifth embodiment of the present invention, in which the conductor 123 in the fourth embodiment shown in FIG. 7 is omitted and the power source 3 is connected to transparent resistive films 131 and 122.
1. Suppression position coordinates can be detected in the same manner as in each of the above embodiments.

In each of the above embodiments, the transparent resistance sheets 120 and 130 are made of 7V Xyglu sheets with conductive films such as ITO or 5N01 formed on both sides or one side. It is also possible to use a flexible sheet having the following properties. Furthermore, in each of the above embodiments, diodes were used as the detection electrodes 1a to 1d and 2a to 2d, or instead of diodes, current could be caused to flow in or out of the transparent resistive film. Only turtle mvt1). An element that can be used can be used. It is easy to see that in order to turn on the power source 3 or the constant voltage source 31 in the opposite direction, it is necessary to connect the power source 3 or the constant voltage source 31 in the opposite direction. Further, in each of the above embodiments, the input surface and the display surface are separated, but the substrate 100 is made of, for example, a protective glass for a liquid crystal display, and a transparent resistive film 101 made of SnO3 or ITOv is formed on the protective glass. You can also do that.

[Invention effect]

As explained above, the coordinate human power device according to the present invention has the following features:
It consists of a first transparent input panel and a second transparent input panel, both of which are placed on top of each other, and since they are entirely transparent, they are stacked on top of the display, and the current display V-
It can be used to modify characters and figures displayed above, or to select items displayed in light, and in that case, it does not matter whether you are inputting with a pen or the like or with the same pressure of your fingers. It has the advantage of being able to input information.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the input part of the coordinate input device of the invention,
Fig. 2 is a schematic cross-sectional view taken along line A-A' of Fig. M1, Fig. 3 is a schematic cross-sectional view similar to Fig. 2 showing another example, and Fig. 4 is an overall configuration diagram showing a simple embodiment of this invention. , FIG. 5, and FIG. 6 are overall configuration diagrams showing other embodiments of the present invention, and FIG.
8 are schematic cross-sectional views of input portions showing still other embodiments of the present invention. In the figure, 1 a to 1 d, 2 a to 2 d are detection electrodes, 3 is a power source, 4 a to 4 c, 5 a to 5 c, 5
a~6c. 7m=7c is a detection resistor, 4d, 5d, 6d, 7d are switches, 31 is a constant current source, 81 to 92 are operational amplifiers, 1
00 is the substrate, 101, 121, 122° 131 is the transparent resistive film, 1) 0.141i transparent pressure sensitive sheet, 120.1
30 is a transparent resistance sheet, and 123 is a conductive turtle body. Figure 1 1) 0: Transparent pressure sensitive sheet Figure 2 Figure 3 Figure 4 Figure 5 Figure 7 Figure 8

Claims (2)

[Claims] (1) Two transparent and electrically conductive transparent resistive films are arranged face to face with a space or a transparent pressure-sensitive sheet interposed therebetween,
Detection electrodes are provided on the four sides of the one transparent resistive film to allow current to flow only in either the direction in which the current flows out or the direction in which the current flows in from the transparent resistive film, and a voltage is applied between the two transparent resistive films. A first method comprising: a power source for applying power; and a position detecting means for detecting a current from the detection electrode when the two transparent resistive films are brought into electrical contact with each other due to an external force, and determining the position coordinates of the point of contact. A transparent input panel; two transparent and electrically conductive transparent resistive films are arranged face to face with a space or a transparent pressure-sensitive sheet interposed therebetween; A detection electrode is provided that allows current to flow only in either the outflow or inflow direction, a power source is provided that applies a voltage between the two transparent resistive films, and the first transparent input panel is provided. When the two transparent resistive films come into electrical contact with each other due to an external force of a predetermined magnitude larger per unit area than the external force that activates the, the power source from the detection electrode is detected and the position coordinates of the point of contact are determined. A coordinate input device comprising: a second transparent input board provided with a position detecting means; and the first transparent input board is placed over the second transparent input board. (2) The first transparent input panel and the second transparent input panel are commonly connected to each other.
Coordinate input device described in ).