JPS5862772A - Coordinate input device - Google Patents

Abstract

PURPOSE:To use an arbitrary input means, by the constitution that the 2nd board provided with a surface shape electrode connected to a current supply means is arranged opposing to the 1st board having a surface resistance body. CONSTITUTION:A surface resistance body 104 is coated on the 1st insulating board 201, X electrode couple 280 and Y electrode couple 280' are provided near the opposing side of the body 104 and connected to an X impedance matching circuit 202 and a Y impedance matching circuit 202'. The 2nd board 206 provided with a surface shape electrode 205 is arranged opposing to the 1st board 201. In depressing the 2nd board 206 through the use of an arbitrary input means 208, an X coordinate value 293, a Y coordinate value 293' are outputted from an X operation mechanism 292 and a Y operation mechanism 292'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coordinate input device, particularly a coordinate input device of a type that detects the current division position of a sheet resistor.
It has 11 connected input pens and a board to which diodes are added scattered around the X and Y areas of the sheet resistor.

An input ben is brought into contact with a desired input position of the sheet resistor to supply current into the sheet resistor.

Since the value of the divided current flowing in the X or Y coordinate direction is inversely proportional to the distance, it is constructed based on the principle that the divided current is checked and used as input position information. Yota diode allows current to pass in the X or Y direction, without passing the current I! This is a time-consuming process. In terms of the method, the above-mentioned method has occupied most of the construction area.However, in this method, the signal line that electrically connects the current supply means and the input pen suffers, and the operability during input is quickly deteriorated. −It cannot be considered an effective manual method from an engineering perspective. Furthermore, in order to improve the positional accuracy, it is necessary to increase the number of diodes arranged in the peripheral area, which results in a complicated configuration and an expensive device. Furthermore, in the conventional method, one end El of each of X and Y
The problem is that accurate input position information cannot be output due to temperature fluctuations in the sheet resistor or diode, which reduces reliability. Clarify the problem based on an example. Figure 1 is from J.N. Turner and Richer: “Linear Current Division In Resistive Area; 72, 1170 (J, A
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This is a diagram showing a typical example of a conventional method in which a diode is arranged around a sheet resistor proposed by (N.CE, 197G). In the same figure, 209 is a current supply means, 102
is a signal line, 103 is an input vent, 1-04 is a sheet resistor, 1
05 is an X-direction diode, 105 is a Y-direction diode,
106 is an X-direction drive circuit, 107 is a Y-direction drive circuit, 1
0B is the resistance in the X direction, and 109 is the resistance in the Y direction. The input port 103 is connected to the current supply means 209 via the signal line 102.
The periphery of the sheet resistor 104 is dotted with X-direction dies 105 and Y-direction ties 105'. When inputting manual position information for waste, the input pen 103 is brought into contact with the sheet resistor 104 and the diffraction antibody IQ4 is
When the OX direction drive wJ circuit 106 and the Y direction drive circuit 107 are operated to supply current to the The waterfall is divided into left and right at the input position and flows in each direction.
Since the divided current flowing through the polarizing resistor 10B is inversely proportional to the distance, input position information can be detected. The same thing is true! .

The same can be said about the direction, and by time-sharing control, X, Y
This method mainly involves a person holding an input pen 103 in their hand and touching the surface resistor 104 to input position information, so that a movable signal @102 is detected. I need. If the probe 102 is used to move freely within the plane of the sheet resistor 104, the signal@102 force≦disaster will occur, and the operability during input will be seriously deteriorated. Also, material 1 of signal @102
Also, since general-purpose copper and copper alloy are used, if a large number of wires are used, the wires will break and reliability will be reduced. There is -]wl which is caused by using 102. In order to obtain an accurate input position by increasing the excellent resolution, the division 1 [* flowing within the surface of the sheet resistor 104 must be made uniform.
Tki (lk k*
X-direction dies and odes 10 dotted around the body 104
5. Is it necessary to increase the number of Y-man 1st diode 10S't) IX?As a result of a prototype experiment in an attempt to reduce the input accuracy error within a few percent on the manual board surface of the 030X40, the result was about 13 to 2m. The fact that diodes had to be connected and arranged at intervals of
(30+40) k2-240411) is also required, which is disadvantageous in terms of the man-hours for connecting the diode and the cost. In addition, it is common to use a semiconductor Jfi such as indium oxide or tin oxide, or a gold mill such as gold, palladium, or aluminum as the ml resistor 104, but it is difficult to make this uniform inward.
When using the most common manufacturing methods, vacuum evaporation and sputtering, variations of ±5- are unavoidable. If this is to be corrected for each coordinate position manually, impedance matching on the electric circuit must be performed, which is also undesirable in terms of man-hours and cost.Furthermore, the sheet resistor 10
4 As a general analogy, if we take indium oxide as an example, the specific resistance is 1gIJ-ix at the temperature of the temperature, but when the temperature is raised to about Zoo℃, the resistivity becomes 1'2ρψt:rst.
O:) f-da ζ changes every time (it ends up having a large mt dependence. Also, regarding diodes, silicon and germanium have a temperature sensitivity of 3゛, so similarly @political change- Therefore, the conventional method of detecting the current flowing through one end of each There is also the problem that it becomes a difficult and unreliable coordinate input device.O In any case, the problem is that the conventional method has poor operability, is expensive, and has low reliability. Therefore, it is an object of the present invention to provide a coordinate input device that improves the problems associated with the conventional device configuration method as described above. It is in.

According to the present invention, in a coordinate input device whose input position information is a current dividing position by a uniform sheet resistor, the X%Yt
A 1s1 substrate provided with a reef pair, and a lk2 substrate provided with a uniform planar electrode disposed on the opposing surface of the first substrate and provided with flexibility, the first A manual power board consisting of a support that insulates and holds the substrate and the second substrate, a means for supplying current to the cocoon-shaped electrode, and the planar electrode contacts and flows into the planar resistor, and the x , y', a difference detection circuit that measures the difference between the divided currents detected by the pole pair,
A power calculation circuit that detects the added value of one current and the difference detection i
The above object can be achieved by providing an arithmetic mechanism that calculates the X1Y value from the output signals from the road and the road.

Next, the configuration, structure, operation, function, and effect of the present invention will be explained in detail with reference to the drawings. The second WJ is a principle explanatory diagram for explaining the present invention in detail.

As shown in the figure, a sheet resistor 104 having a uniform sheet resistance is adhered to the upper surface of an insulating first substrate 201, and xt* pairs 280 are arranged at the ends, each connected to the ground. It is connected.

When a current l801 is injected into a certain point on the surface of the sheet resistor 104, the current is divided into the left and right sides of the sheet resistor 104, and the current 11:
11 802, electric fiI, 803 flows toward the electrodes.In the figure, if the resistance between the perspiration point and the leftmost electrode is 8o, and the resistance between the rightmost electrode is R, then the current I , and the current Is 611&'/I-B./R1. Since the one-sided resistor 1041 is uniform within the image, Rv/n* is the distance between the current injection position and the right end electrode -X
, and the distance between the leftmost electrodes! , can be considered to be the same as xt7'X. Therefore, the current and distance are inversely proportional to 4 It/X
The relationship s −xJ/'xx holds true. The above formula is mathematically (In −Is )/(xx+Im )−
It is possible to convert (It -
A proportional relationship of In −Is −−(1K −XI ) −@ holds between the difference current (t, −LI) and the distance difference z@−Xm. Therefore, when trying to find the coordinates of an arbitrary input position in the sheet resistor 104, the difference current flowing in both directions with the center between the X electrode pair 280 as the origin (
Find 61 (In - Im).

The same thing can be said about the Y direction.
(b) is a block diagram of the coordinate input device according to the first embodiment of the present invention, and a cross-sectional view of the input panel. In (m) of the same figure, the upper surface of the insulating first substrate 201 is A sheet resistor 104 with no uniform white-LK resistance is applied in a predetermined shape, and a pair of scoop resistors 104 [xt*pair 280,
A pair of Y electrodes 280' is connected to an X impedance matching circuit 1202 and a Y impedance matching circuit 202' made up of resistive elements and the like. xt pair 280, Y
The electrode pairs 280' each have an X-divided current 29 which is switched in X directions.
*Mg is applied to an X difference detection circuit 203 and a Y difference detection circuit 203 which measure the nutrients of the Y division current 295' flowing in both directions of 5Y, and output an X difference signal 210 and a Y difference signal 210'. X electrode pair 280% Y electrode pair 280' is further
An X addition circuit 29G for detecting an addition value in the 1Y direction, a Y addition circuit M29G'l, an X addition signal z@t, and a y addition signal 291' are output. The X calculation mechanism 292 and Y calculation mechanism 292', which are composed of a real circuit or a computer system, respectively receive an X difference signal 210s, an X addition signal 291, and a Y
After receiving the difference signal 210' and the Y addition signal 291',
By normalizing the current value flowing in the direction and calculating the difference current of the unit current, the X coordinate value is 293, and the ymm value is 29 m'! ) Output and chill 1ru〇On the other hand, on the opposite image of the first substrate 2010, there is a third substrate having a flexible IUI such as a polyester film provided with a planar electrode 205.
A base [206] is arranged, and is insulated by a support 207 so that there is no electrical contact other than when waiting for input, and is connected to the sheet resistor 104 via a W1-shaped electrode 205.
In this case, the sheet resistor 104 may be made of the same material as the first substrate 201. 0) is shown with its position shifted for ease of understanding. In the figure, the second substrate 20 having a planar electrode 205 is shown.
6 are insulated and held by supports 207 arranged at predetermined intervals, but in order to obtain desired input position information using an arbitrary input means 20g that does not have a signal such as a human finger or a ballpoint pen during input, The board 206 of
When the sheet resistor 205 is brought into contact with the sheet resistor 205 and the current from the current supply means 20g is supplied to the sheet resistor 104, the X electrode pair 280 and the Y electrode pair 2 arranged on each side from the input position
The electrodes are divided due to the difference in resistance up to 80', and sheet resistors 104 are arranged in the direction of each electrode as shown by arrow 295.
It shows the miko flowing within.

More stripes 3 i! As is clear from d(a) and (b),
This embodiment has a configuration in which a second substrate @ 206 provided with a planar electrode 205 connected to a current supply means 209 is arranged facing a first substrate having a sheet resistance weight 04. As the input means, an arbitrary input means 208 such as a human finger or a ballpoint pen can be used, and the special stylus of the input pen 103 provided with the above-mentioned keyboard 102 is not required.

Therefore, the disadvantage of poor operability during input due to the use of a special stylus can be corrected, and it is an effective input method from an ergonomic point of view, and the decrease in dependability due to disconnection of No. 102. ◎It is not necessary to arrange diodes scattered around the desired area of the sheet resistor 104 (although there is a simplified structure), it also has an advantage in terms of price. Furthermore, in this method, the X-divided current 29 flowing in both directions of xlY
5. Since the difference value of the Y division area fi 295/ is detected by the X difference detection circuit zos and the y difference detection circuit 203', the sheet resistance Since the temperature coefficient is considered to be unique, and the proportional relationship between the difference current and the difference value of the sheet resistance is maintained, the influence caused by the external environment such as temperature fluctuation is small, and accurate input position information can be obtained.

Even if the temperature rise of the sheet resistor 104 is not uniform within the surface, since the difference value is detected, it is clear that the amount of change is small and the input position accuracy can be improved.
Arithmetic mechanism 292. In the Y calculation mechanism 292', the current flowing in the X%Y direction is normalized and the difference current per unit supply current is determined. There is also the advantage that the first embodiment of the present invention has been described above, but if this embodiment is followed, the operability is improved and the red It is clear that a relatively low-cost, highly reliable coordinate input device can be realized. FIG. 4 shows a second embodiment of the present invention.

In this embodiment, the xt electrode pair 280 and the Y electrode pair 280 in the first embodiment are arranged in a dotted manner near the center of each side. When a current is supplied to the position, a divided current flows into the sheet resistor 104. When ta is supplied near the periphery of the sheet resistor 104, the specific resistance of the XvL4fi pair 280 and the Yta pair 280' is very small, but the sheet resistance of the sheet resistor 10 is usually about 200Q/CIA, There is a considerable difference between the adjacent XX number 28G and Yt number 280.
Since the distance between the electrode and the electrode is short and the resistance is low, the supply current flows through the pair of electrodes to the electrode. Therefore, the X minute i' section flow 295 which is effective for coordinate detection
And the Y-divided voltage @295' decreases, and the counting range becomes narrower.As mentioned above, the area of the surface resistor is affected by the variation in the constraint resistance within the plane, especially the variation between the ta that is in contact with t at bμ around 1θ4? It has the disadvantage that the 1LiI property is poor and the effective input area is narrow.

Therefore, if the Xw electrode pair 280 and the Y electrode pair 280 are arranged in a dotted manner near the center of each side as shown in this embodiment, the current flowing around each electrode will be extremely small, and the current can be effectively used even in the periphery of the sheet resistor 104. This has the advantage that a coordinate input device with a large input area can be expressed. The configuration of other parts, operating principles, functions, effects, etc. other than this embodiment are the same as those of the first embodiment, so explanations are omitted. 〇 Figure 5 is a cross-sectional view of an input panel showing a third example of the invention. In this example, the support 207 in the first example is replaced with a pressure-sensitive conductive material 401.

In the embodiment @1, by arranging the supports 207 at predetermined intervals, malfunctions due to contact between the sheet resistor 104 and the sheet electrode 205 at times other than when waiting for input are prevented. Support 2
The height of the second substrate 2 is generally set to 50 μm to 100 μm, for example, by mechanical processing.
If 06 is manufactured, dead areas of 0.5 mm to 11 will be scattered within the plane. This poses an inconvenience in that it cannot be used when continuous input is required, such as for several characters, 11 figures, etc.

Therefore, as shown in this embodiment, a pressure-sensitive conductive material 401 made of a sheet-like pressure-sensitive conductive rubber or a pressure-sensitive conductive paste that can be manufactured by screen printing or the like is used as the multi-support body 207 as a first base. &201(!:42 board 2
Support bodies 207 scattered by being arranged between 06 and 06
It has the advantage of being able to improve the dead area problem caused by this, and also allowing continuous input. The configuration of other parts, operating principles, functions, effects, etc. other than this embodiment are the same as those of the first embodiment, so explanations thereof will be omitted.

FIG. 6 is a perspective view showing a fourth embodiment of the present invention.
゜First substrate 2011 planar electrode 205, second substrate 206
An input panel made entirely of optically transparent material is placed on the display surface -E, and arbitrary input terminals for human power &2 are placed on the display surface -E.
Figure 6(m) shows an example of how to detect the input position tt# information while looking at the displayed content using the display 25G. 6) is a cross-sectional view of its configuration, showing how information is input and output using the arbitrary input means 208, and the substrate 201 of w, 1 is made of a transparent material such as glass or a polymer compound. ing. On the surface of the first substrate 2010, there is a transparent surface resistor 260 which is made of indium oxide, tin oxide, etc. and is heat-treated to make it relatively transparent.
◎ On the other hand, the substrate 206 of Algae 2 is a polyester film etc. that has continuity and good transmittance.
s is a transparent sheet electrode@261 made of a material such as gold, indium oxide, or an alloy of indium -oxide and tin oxide by vapor deposition, etc., and made of a thin film with a lift of 10X as much as possible. ◎ The above configuration is effective. Since the coordinate input device is transparent on the input surface, it is placed on the surface of the display 25G, and while viewing the displayed contents, the arbitrary input means 208 is used to input t+t N.
It has the advantage of being able to input and output data. Since the other parts, operating principles, functions, effects, etc. other than this embodiment, are the same as those of the first embodiment, their explanations will be omitted.

Although the first to fourth embodiments of the present invention have been described above, the basic operation Mi1M of the present invention.

It is clear that the present invention can be applied to any coordinate input device having a configuration or structure in which each component is modified, as long as the operation and effect are the same.

[Brief explanation of the drawing]

The first is a diagram showing an example of a typical input panel of the conventional method, and the second
The figure shows the principle of a non-explosion engine, Figures 13 (m) and (b) are configuration diagrams showing the absolute first embodiment of the present invention, and a sectional view of the input panel.The fourth theory is the second embodiment of the present invention. , FIG. 5 is a block diagram showing a third central embodiment of the present invention, and FIG. 6 is a block diagram showing a fourth embodiment of the present invention. In each figure, 102 is a probe, 103 is an input pen,
104 is a sheet resistor, 1011 is an X direction diode, 10
5' is a Y direction diode, 1 (l is an X direction drive circuit, 1
07 is the Y-direction section lll11 circuit, 108 is the X-direction resistance,
109 is a Y direction resistance, 201 is a first substrate, 202 is an X
Impedance adjustment oWX path, 2.2' is a Y impedance matching circuit, 203 is an X difference detection circuit, 20m' is a Y difference detection path, 205 is a planar electrode, 206 is a second substrate,
207 is a support, 208 is an arbitrary input means, gos is a current supply means, 2104;! X difference + (14,21mttY
II minute IIJt, 250 is a display, 260 is a transparent surface resistor, 261 is a transparent surface electrode, 280tiX pair a, 280' is Yt1i pair, 290jtX, IEI calculation am
,! 90'JtYJI calculation circuit, 291 is X addition signal, 2
91' is a Y addition signal, 298 is an X calculation mechanism, and 29! '
41YIll calculation mechanism, 2931tX coordinate value, z93' is yms value, 401 is f

Claims (1)

[Claims] In the Ik1 square input & meal where the voltage division position by a uniform sheet resistor is input position information, II! ]x1Ytli having a box resistor and wired near the opposite side of the sheet resistor
a first substrate having a pair of substrates; a flexible second substrate having uniform Ii-like impurities disposed on an opposing surface of the first substrate; an input board consisting of a support that insulates and holds the substrate of No. 2; a means for supplying current to the image-shaped electrode; and when the image-shaped electrode contacts and current flows into the sheet resistor, the A calculation mechanism that calculates the XSY coordinate value from the output signals from the difference detection circuit that detects the difference between the divided currents detected by the other pair, the addition circuit that detects the added value of the divided currents of X%Y, and the difference detection circuit. A coordinate input device O characterized by: