JPH0253132A - Touch panel - Google Patents

Abstract

PURPOSE:To correctly detect the coordinates of a touch input point even though this point is set at an intermediate position between contact parts by securing the coincidence between the resistance value per unit length of each electrode line and the resistance value per unit length of a voltage dividing line. CONSTITUTION:The resistance value per unit length of each of electrode lines 25 and 26 is set equal to the resistance value per unit length of a voltage dividing line. As a result, the output voltage obtained when plural contact parts are turned on at one time is approximate to the intermediate value of each output voltage of contact parts S11 - 55 obtained when one of these contact parts is turned on even in the case of the constant current drive and the constant voltage drive. Thus it is possible to accurately know the coordinates of a touch input point even in the case this point is set at an intermediate position between the contact parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an analog type touch panel.

[Conventional technology]

2. Description of the Related Art As touch panels for input operations provided on a display surface, a keyboard, etc. of electronic equipment, there are known two types: digital type and analog type.

Figure 8 shows a digital touch panel.
In the figure, 1 and 2 are a pair of upper and lower sheets in which a large number of transparent electrode lines 5 and 6 are formed in parallel on four sides of a transparent insulating film 3. Electrode line 5 on sheet body 1 and electrode line 6 on the other sheet body 2
They are arranged facing each other at right angles to each other, and are polymerized and bonded via a spacer (not shown).

This digital touch panel is time-divisionally driven and outputs a digital signal according to the coordinates of the touch input point (the contact position of the electrode lines 5 and 6 touched by a touch operation). A drive signal is supplied to the terminals 5a, 5a of the electrode lines 5, 5 of the sheet body 1, and the terminal outputs (digital signals) of the electrode lines 6.6 of the other sheet body 2 are sequentially read. If a drive signal is sequentially supplied to the terminals 6a, 6a of the electrode lines 6.6 of the electrode lines 6, 6, and the terminal outputs (digital signals) of the electrode lines 5, 5 of one sheet body 1 are sequentially read, the electrodes of one sheet body 1 Output of line 5.5 and electrode line 6 of the other sheet body 2
．． 6, the X-Y coordinates of the touch input point can be found.

However, since the digital touch panel described above is time-divisionally driven, a control circuit must be individually connected to the terminals 5a and 6a of each electrode line 5 and 6 of each sheet body 1.2. Therefore, as the number of electrode lines increases and the resolution increases, the connection between the touch panel and the control circuit becomes more difficult, and the time-sharing signal processing in the control circuit that drives the touch panel and processes its output signals becomes more difficult. Another problem is that it takes a long time to detect the coordinates of the touch input point after the touch input operation.

On the other hand, an analog type touch panel outputs the coordinates of a touch input point as an analog signal, and because it has a small number of terminals, it is difficult to connect it to a control circuit. Moreover, it also has the advantage that the time from manual touch operation to detection of the coordinates of the touch input point is short.

This analog type touch panel generally has a planar resistive film covering the entire touch input area formed on the opposing surfaces of a pair of sheet members, and an X-axis of the planar resistive film on one sheet member. It is known that electrodes are formed on both edges in the Y-axis direction and on both edges in the Y-axis direction of the planar resistive film of the other sheet body, respectively, to allow current to flow throughout the entire length of the planar resistive film. . However, in this touch panel, when a driving voltage is applied between the electrodes on both sides of the planar resistive film and a current is passed through the resistive film, there is a potential difference within the electrode due to the resistance of the electrode itself, and a difference in potential from the electrode to the surface. Because the linearity of the potential distribution of the sheet resistive film is lost due to the potential difference caused by the connection resistance that occurs when current flows through the sheet resistive film, it is necessary to provide a circuit in the touch panel control circuit to compensate for this. The configuration of the control circuit becomes complicated, and if the thickness of the sheet resistive film is not uniform over the entire surface, the potential distribution will vary significantly. The thickness had to be controlled to have a uniform resistance value throughout.

For this reason, recently, analog type touch panels are equipped with multiple electrode lines along the X-axis force direction and a partial pressure line that commonly connects the ends of each electrode line on one of a pair of opposing sheet bodies. A configuration has been considered in which the other sheet body is provided with a large number of electrode lines along the Y-axis direction and a partial voltage line that commonly connects the ends of the electrode lines.

FIG. 5 shows the touch panel. In FIG. 5, reference numerals 11 and 12 indicate a pair of upper and lower sheet bodies.

Each of the sheet bodies 11.12 has a large number of electrode lines 15.15 and 16.18 wired in parallel on the transparent insulating film 13. A partial voltage line 17 commonly connecting one end of electrode lines 15.15 and 113.16.
and 18, and the electrode line 15.1
5 and 16.18 are wired by laying low resistance metal wires embedded in the insulating film 13.14, and the voltage dividing line 17.18 is wired by installing a resistor such as carbon paste on the surface of the insulating film 13.14. It is formed by printing. Also, 17a, 17b and 18a, 18
b are two terminals formed on the side edges of the sheet body 11.12, these terminals 17a, 17b and 18a
, 18b are connected to the voltage dividing line 17., 18b via lead wiring.
It is connected to both ends of 18. Among these terminals, 17a
, L8a is an input/output terminal that serves as both a positive input terminal and an output terminal, and 17b and 18b are negative input terminals. In addition, each terminal 17a is connected to the voltage dividing line 17.18.

The lengths of the lead wires 17b, 18a, and 18b are approximately equal. The pair of sheet bodies tl, 12 are arranged opposite to each other with the electrode lines 15.15 of one sheet body 11 and the electrode lines 16°lB of the other sheet body 12 orthogonal to each other, with spacers (not shown) interposed therebetween. Polymer bonded.

FIG. 6 shows the circuit of the touch panel, in which Xi and X2 are the electrode line numbers of one sheet body 11, and Y
1, Y2, . . . indicate the electrode line numbers of the other sheet body 12. Also, RXI, RX2... and R
YI, RY2... are the resistances between the electrode line connections of the voltage dividing lines 17 and 18, RXa, RXb and RYa
.

RYb is the resistance of the terminal connection lead wiring section, RLx, RL
X... and RLy, RLy... are the contact points of each electrode line 15.15 and 16.18 (electrode line 15
．． 16 are intersecting and opposing) Sll, S12
In conventional touch panels, the electrode lines 15.15... and 16.16... are made of metal with a small resistance value, and the voltage dividing lines 17.18 are made of carbon paste or the like. Since it is formed of a resistor, the resistance RX1 between each electrode line connection part of the voltage dividing line 17 and 18 is
．． RX2... and RYl.

RY2... and each electrode line 15.15 and te,
Resistance RLx between contact parts Sll, S12... of ie,
RLx... and Rt, y, Rt, y... have the following relationship: RXi to RX4>RLx RYI to RY4>RLy.

In addition, in FIG. 6, RLx' and RLy' are
of each electrode line 15.15 and 18.16, partial pressure line 17. tg and first contact part 5ll-851 and S
It is a resistance between LI and S15, and RLx' and RLy' have the following relationship: RLX'≧RLX RLy'≧RLy.

This touch panel outputs the coordinates of a touch input point as an analog signal. To detect the coordinates of a touch input point by this touch panel, first, a drive signal (constant voltage or A constant current signal) is supplied to measure the output voltage of the terminal 18a of the other sheet body 12, and this output voltage value is expressed as a coordinate value (
(digital value) to obtain the input point coordinates in one direction (Y-axis direction), then the terminal 18a of the other sheet body 12,
18b, the output voltage of the terminal 17a of one sheet body 11 is fixed by δ-1, this output voltage value is converted into a coordinate value (digital value), and the output voltage in the other direction (X-axis direction) is converted to a coordinate value (digital value). This is done by finding the input point coordinates. The operation of this touch panel will be explained with reference to the circuit shown in FIG. A current flows from the positive terminal 17a side to the negative terminal 17b side, and the potential of each electrode line 15°15 connected to this voltage dividing line 17 becomes the voltage divided by the voltage dividing line 17 ( As the current flows through the voltage dividing line 17, the voltage gradually drops.

For example, in FIG. 6, if the contact portion where the electrode line 15 of X2 and the electrode line 1G of Y2 cross and oppose each other is turned on by a touch operation, then
A current flows through the two-electrode line 15Y2 electrode line 1G, this current flows to the input/output terminal t8a via the Y2 electrode line 16, the voltage dividing line 18, and the lead wiring section, and the voltage value of this input/output terminal 18a becomes X2. Y2 with respect to the potential of the electrode line 15? l (resistances RLy, RLy, RY in the polar line 1B, voltage dividing line 18, and lead wiring part)
l.

The voltage is reduced by RYa, and this voltage is output as a Y-axis coordinate signal (analog signal) of the touch input point. This is the terminal 18a of the other sheet body 12 when detecting the X-axis coordinate of the touch input point.

The same applies when a drive signal is supplied to the voltage dividing line 18b. In this case, each electrode line t connected to the voltage dividing line 18
The potentials of e and ie are divided by the voltage dividing line 18, and the X-axis coordinate signal of the touch input point is output from the input/output terminal 17a.

[Problem to be solved by the invention]

By the way, in the above-mentioned touch panel, since the touch panel is touched manually by pressing an object with a certain area such as a fingertip, only one contact part is not always turned on at the time of touch input, but multiple adjacent contact parts are turned on at the same time. It may be turned on. In this case, the output voltage of the input/output terminals 17a and 18a when the plurality of contact sections are turned on at the same time is the intermediate value of the respective output voltages when only one of the plurality of contact sections is turned on individually. If this is the case, then from this output voltage, the middle position of multiple contacts that are turned on at the same time can be regarded as the touch input point, and the coordinates can be found. However, with conventional touch panels, when multiple contacts are turned on at the same time, The output voltage value is close to or the same as the output voltage value when only one of the multiple contacts is turned on, so multiple adjacent contacts are turned on at the same time. It was not possible to correctly know the coordinates of the touch input point in this case.

In other words, FIG. 7 shows the output voltage value (Y
This figure shows the result of calculating the output voltage value from the input/output terminal 18a when detecting the axis coordinates.
is the output voltage when a constant voltage (6V) drive signal is input between the terminals 17a and 17b, and ee is the output voltage between the terminals 17a and 1.
It shows the output voltage when a constant current (1 A) drive signal is input between 7b and 7b. In addition, here, for convenience of calculation, the resistance RX between each electrode line connection part of the voltage dividing line 17 and 18 is
1. RX2... and RYl.

RY2... and the resistance RXa of the terminal connection lead wiring section.

RXb, RYa, RYb and each electrode line 15
．． 15 and ie, 16 contact part Sll, 51
2 - Resistance RLx between...

RLx... and Rt, y, Rt, y... and the partial pressure line 1 of each electrode line 15°15 and 16.16
7. Resistances RLx' and R between 18 and the first contact
1,y/ to RXi ~ RX4-1 Ω RYl
-RY4-1 ΩRLx-1Ω RLy-1Ω RXa -RXb -1kQ RYa -RYb
-1, the output voltage was calculated as ΩRLx'-1ΩRL)l'-1Ω.

As can be seen from this calculation result, in the conventional touch panel, when driven at a constant voltage, the contact portion s ii.

The output voltage when S21 turns on at the same time is 4.80V
.

When the contacts S21.331 are turned on at the same time, the output voltages are a, eov, and the contact parts S31. When S41 is turned on at the same time, the output voltage is 2.40V, and the contact part S41.
The output voltage when S51 is turned on at the same time is 1.20V, and near the middle of the resistor network, the two contact parts S21.
S31 and S31. The output voltages (3,80V, 2.40V) when S41 are turned on at the same time are the two contact parts S21. S 31 and S 31. S
Output voltage value when only one of 41 is turned on (
321 on-4,00V, 531ton-3, OOV
) and the output voltage value when only the other contact part is turned on (S 31.t > -3, OOV, S 41.
The intermediate value (3,50V, 2
．． 50V), but on the high voltage side of the resistor network, the two contact portions 811. The output voltage (4,80V) when S21 is turned on at the same time is close to the output voltage value (5,00V) when only the high voltage side contact Sll is turned on, and on the low voltage side of the resistor network, the output voltage (4,80V) is close to the output voltage value (5,00V) when only the high voltage side contact Sll is turned on. ．． The output voltage (1,20V) when S51 is turned on at the same time is the low voltage side contact S
Output voltage value when only 51 is on (1, OOV)
Therefore, even though the touch input point is located between the two contact points on the high voltage side and low voltage side of the resistance network, the coordinates of this touch input point are shifted to the high voltage side or the low voltage side. This will result in incorrect detection of the coordinates.

In addition, when driving with constant current, the output voltage when the contacts Sll and S21 are turned on at the same time is 4.00V, and the output voltage is 4.00V.
21. The output voltage when S31 is turned on at the same time is 3.0
0V, contact part S31. The output voltage when S41 is turned on at the same time is 2. OOV, contact part S41. S51
The output voltage when turned on at the same time is 1.00V,
Therefore, in a conventional touch panel, even in that part of the resistor network, the output voltage when two contacts are turned on at the same time is the output voltage when only the low voltage side of the two contacts S is turned on. Even though the middle position between the two contact points is the touch input point,
The coordinates of this touch input point will be erroneously detected as coordinates shifted to the low voltage side.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to improve the output when a plurality of contacts are turned on at the same time, whether in constant voltage drive or constant current drive. The touch input point is located at an intermediate position between the plurality of contact sections so that the voltage is close to the intermediate value of the respective output voltages when only one of the plurality of contact sections is individually turned on. An object of the present invention is to provide a touch panel that allows the coordinates of a touch input point to be accurately known even in the case of a touch input point.

[Means to solve the problem]

The touch panel of the present invention has a pair of sheet bodies in which a large number of electrode lines are wired in parallel on an insulating film surface, and the ends of each electrode line are commonly connected by a voltage dividing line. In an analog type touch panel in which the electrode lines of the other sheet body are arranged facing each other orthogonally, the resistance value per unit length of each electrode line of the pair of sheet bodies, and the resistance value per unit length of the partial voltage line. It is characterized by having the same resistance value.

[Effect]

In this way, if the resistance value per unit length of each electrode line is equal to the resistance value per unit length of the voltage dividing line, multiple contact points can be The output voltage when the contacts are turned on at the same time is close to the intermediate value of the respective output voltages when only one of the plurality of contact parts is turned on individually. Therefore, according to the touch panel of the present invention, the touch input point The coordinates of this touch input point can be accurately known even when the touch input point is located at an intermediate position between a plurality of contact points.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

Figure 1 shows the configuration of the touch panel.
．． 22 is a pair of upper and lower sheet bodies. This sheet body 21
．． 22, a large number of electrode lines 25, 25 and 26° 28 are wired in parallel on the transparent insulating films 23 and 24, respectively, and the insulating films 23, 24
on the surface, its respective electrode lines 25.25 and 2B.

26 are formed with voltage dividing lines 27 and 28 that commonly connect one end of the electrode lines 25, 25 and 28.
26 and the voltage dividing lines 27 and 28, the resistance value per unit length of each electrode line 25° 25 and 26.28 is equal to the resistance value per unit length of the voltage dividing lines 27 and 28. The same conductive material (metal, ITO)
etc.) and are formed with the same thickness and width.

Also, 27a, 27b and 28a, 21ib
are two terminals formed on the side edges of the sheet bodies 21 and 22, and these terminals 27a, 27b and 28a,
28b is connected to the voltage dividing line 27.2 via lead wiring.
Connected to both ends of 8. Of these terminals, 27a
, 28a are input/output terminals that serve as both a positive input terminal and an output terminal, and 27b and 2111b are negative input terminals. Note that the lengths of the lead wires from the voltage dividing line 27.28 to each terminal 27a, 27b and 28a, 28b are approximately the same length, and these terminals 27a, 27b and 28a, 28b
The lead wires and the electrode lines 25, 26 and the voltage dividing lines 27, 28 are also formed of the same conductive material and have the same thickness and width. The pair of sheet bodies 21.
22 are disposed facing each other with the electrode lines 25.25 of one sheet body 2I and the electrode lines 28.28 of the other sheet body 22 orthogonal to each other, and are bonded by polymerization via a spacer (not shown).

FIG. 2 shows the circuit of the touch panel, in which XI and X2 are the electrode line numbers of one sheet body 21, and Y
1, Y2, . . . indicate the electrode line numbers of the other sheet body 22. Also, RXI, RX2... and R
YI, RY2... are the resistances between each electrode line connection part of the voltage dividing line 27, 28, RXar RXb and RYa
.

RYb is the resistance of the terminal connection lead wiring section, RLx, RL
x... and Rt, y, Rt, y... are the contact parts Sll, S1 of each electrode line 25.25 and 26.28
2..., and in the touch panel, the electrode lines 25, 25... and 28, 28... and the voltage dividing line 27, 28 are made of the same conductive material, the same film thickness, and the same resistance. Because the width is formed, the partial pressure line 27.
Resistors RXI, RX2 between each of the 28 electrode line connections
...and RYI, RY2... and each electrode line 2
5.25 and 26.26 contact part S11゜512-・
・Resistance between RLx, RLX-・- and RLy, R
Ly-... has the following relationship: RXi to RX4=RLxRYl to RY4-RLy.

In addition, in FIG. 2, RLx' and RLy' are
First contact 5tt-851 and SL of each electrode line 15.15 and 18.18 with partial pressure line 17.18
1 to S15, and this RLx' and R
Ly' has the following relationships: RLx'≧RLx RLy'≧RLy.

This touch panel also outputs the coordinates of a touch input point as an analog signal like the conventional touch panel shown in FIG. A drive signal (constant voltage or constant current signal) is supplied to the terminals 27a and 27b of the other sheet body 22, the output voltage of the terminal 28a of the other sheet body 22 is measured, and this output voltage value is converted into a coordinate value (digital value). Find the input point coordinates in one direction (Y-axis direction),
Next, a drive signal is supplied to the terminals 28a and 28b of the other sheet body 22, the output voltage of the terminal 27a of one sheet body 21 is measured, this output voltage value is converted into a coordinate value (digital value), and the output voltage is converted to a coordinate value (digital value). This is done by finding the coordinates of the input point in the direction (X-axis direction).

Therefore, in the above touch panel, the resistance value per unit length of each electrode line 25.25 and 2[1,2G is made equal to the resistance value per unit length of voltage dividing line 27 and 28. Therefore, whether driving at constant voltage or constant current, the output voltage when multiple contacts are turned on at the same time is the same as the output voltage when only one of the contacts is turned on individually. The voltage is close to the median value, and therefore, according to this touch panel, even if the touch input point is at an intermediate position between a plurality of contact portions, the coordinates of the touch input point can be accurately known.

That is, FIG. 3 shows the result of calculating the output voltage value (output voltage value from the input/output terminal 18a when detecting the Y-axis coordinate) when two adjacent contact portions of the touch panel are turned on simultaneously. In the figure, cv is the output voltage when a constant voltage (6V) drive signal is input between the terminals 27a and 27b, and cc is the output voltage between the terminals 27a and 27b.
It shows the output voltage when a constant current (1a+A) drive signal is manually applied between the terminals b. In addition, here, for convenience of calculation, the resistance RX between each electrode line connection part of the voltage dividing line 27 and 28 is
I, RX2... and RYl.

RY2... and the resistance RXa of the terminal connection lead wiring section.

RXb, RYa, RYb and each electrode line 25
．． 25 and 26.28 contact portion S 11. S.L.
2... Resistance RLx between.

RLx... and Rly, Rt, y... and each electrode line 15°-15 and 18. The resistances RLx' and RLy' between the voltage dividing line 17.16 and the first contact point are set to RXi to RX4-1 by ΩRY
~RY4-1 to Ω RLx-1 to Ω RLy-1 to Ω RXa= RXb -1 to Ω RYa= RYb −
The output voltage was calculated by setting Ω to 1, Ω to RLx'-1, and Ω to RLy'-1.

As you can see from this calculation result, with the touch panel above,
When driven at a constant voltage, the output voltage when contact parts s11 and S21 are turned on at the same time is 4.70V.

Contact portion S21. The output voltage when S31 is turned on at the same time is 3.85V, the output voltage when contact parts 831.841 are turned on at the same time is 2.61V, and the output voltage is 2.61V when contact parts 831. S
The output voltage when S21. S21 and S31. S31 and 841.
One Sll of S41 and 851, S21.
Sol, output voltage value when only S41 is on (SL1 on - 5,00V, 821 on - 4,0
0V, S31 on-3, OOV, 841 on-2
, OOV) and the other contact portion S21. S31.
S41. Output voltage value when only S51 is turned on (S21 on-4, OOV.

S31. ON-3,00V, 341 ON-2,OO
V, S51. on-1,00V”) and the intermediate value (
4,50V, 3.50V, 2.50V.

1.50V), and the difference between this output voltage value and the above intermediate value becomes smaller on the low voltage side of the resistor network.

In addition, when driving with constant current, the contact part S11°S21
The output voltage when both are turned on at the same time is 4.50V.

Contact part S21. The output voltage when S31 is turned on at the same time is 3.50V, and the contact part S31. The output voltage when S41 is turned on at the same time is 2.50V, and the contact part S41. The output voltage when S51 is turned on at the same time is 1.50V, so when the touch panel is driven with constant current, the output voltage value when the two contact parts Sll and 821 are turned on at the same time is 1.50V. The output voltage value is the same as the intermediate value between the output voltage value when only one of the contacts is turned on and the output voltage value when only the other contact portion is turned on.

This also applies to the output voltage value from the input/output terminal 17a when detecting the X-axis coordinate.

Note that here, RLx' and RLy' are defined as RLx
' -RLx, RLy' The output voltage was calculated as -RLy, but if RLx' and RLy' were RLx'>
When RLX%RLy'> RLy, there is a similar tendency as above (RLx'> RLx, RL
When y'>RLy, the difference between the output voltage value and the above-mentioned intermediate value becomes smaller). In addition, the resistances RXa, RXb and RYa, RYb of the terminal connection lead wiring section are RXl
~RX4. RLx and RYI~RY4. R.L.
It does not have to be equal to y, and in that case, the same tendency as above can be obtained, and furthermore, RXa and RXb.

Even if RYa and RYb are not equal, the same tendency as above can be obtained (note that Rxa and RXb and RYa
It is more desirable that RXa>RXb and RYa>RYb exist between RXa and RYb).

FIG. 4 shows another embodiment of the present invention, and this embodiment shows a terminal 27a of one sheet body 21.

27b and terminals 28a, 28 of the other sheet body 22
a and formed on the edge of the same side of the sheet body 21 and 22,
This allows connection between the touch panel and the control circuit to be made in one place. However, in this case, each sheet body 21. 22 partial pressure line 27. There is a difference in the length of the lead wiring part from 28 to terminals 27a, 27b and 28a, 28a, and the resistance of this lead wiring part affects the output voltage value (especially in the case of constant current drive)
Therefore, in this embodiment, a reference voltage is connected to each sheet body 21.22, along with the terminals 27a, 27b and 28a, 28a, to the negative end of the voltage dividing line 27.28 via a lead wiring part. Output terminal 27c, 2
8c, and these reference voltage output terminals 27c, 28c
The coordinates of the touch point are detected by comparing the output voltages of the input/output terminals 27a and 28a.

In the above embodiment, the electrode lines 25.25 and 28.28 and the voltage dividing lines 27 and 28 are made of the same conductive material and have the same thickness and width. 2G, 2B and the voltage dividing lines 27 and 28 may be formed of different conductive materials as long as their resistance values per unit length are the same (however, there may be a difference in resistance value within tolerance). , also electrode lines 25.25 and 26.28 and partial pressure lines 27 and 2
8, one or both of them may be formed by embedding metal wires to connect the electrode lines 25, 28, 28 and the partial pressure lines 27 and 28 by polymeric contact.

〔Effect of the invention〕

According to the touch panel of the present invention, since the resistance value per unit length of each electrode line is equal to the resistance value per unit length of the voltage dividing line, even when driving at constant voltage, constant current driving Even in the case of touch input, the output voltage when multiple contacts are turned on simultaneously is close to the intermediate value of the respective output voltages when only one of the multiple contacts is turned on individually. Even if the point is located in the middle of a plurality of contact points, the coordinates of this touch input point can be accurately known.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a touch panel showing an embodiment of the present invention, Fig. 2 is a circuit diagram of the touch panel, and Fig. 3 is a calculated value of the output voltage when two contact sections are turned on at the same time. 4 is an exploded perspective view of a touch panel showing another embodiment of the present invention, FIG. 5 is an exploded perspective view of a conventional analog type touch panel, FIG. 6 is a circuit diagram of the same touch panel, and FIG. FIG. 8 is an exploded perspective view of the digital touch panel. 21, 22... Sheet body, 23.24... Insulating film, 25, 28... Electrode line, 27.28...
- Partial pressure line, 28a. 28b, 29a, 29b--Terminals. Applicant's agent Takehiko Suzue RXl ~RX4- RLx RJ1~RY4=RLV Figure 2 Cv: Output voltage (V) when constant voltage (6V) is input CC: Output voltage (V when constant current (1mA) is input) )1J3 Figure RX+ ~RXd>RLx RY+~RY4) RLV Figure 6Cv: Output voltage (V) when inputting constant voltage (6V)CC: Output voltage (V) when inputting constant current (1mA)Figure 7

Claims (1)

[Claims] A pair of sheet bodies in which a large number of electrode lines are wired in parallel on the insulating film surface and the ends of each electrode line are commonly connected by a voltage dividing line are connected to each other by connecting the electrode lines of one sheet body and the other sheet body. In an analog type touch panel in which the electrode lines are arranged facing each other at right angles to each other, the resistance value per unit length of each electrode line of the pair of sheet bodies is equal to the resistance value per unit length of the voltage dividing line. A touch panel characterized by: