JP2012194962A - Coordinate input panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coordinate input panel in which single conductive material without necessity of mixture or the like can be used as material for a resistive peripheral electrode other than a surface resistor, a resistance value of the resistive peripheral electrode can be easily designed and which has a pattern of the resistive peripheral electrode dispensing with adjustment of the resistance value due to variations of the surface resistance.SOLUTION: One side is formed of conductive segments having two kinds of shapes, comprising a linear conductive segment and a stepwise conductive segment. The linear conductive segments are arranged so that one piece overlaps a center part of an uppermost step of an adjacent stepwise conductive segment and a half of one piece overlaps each of both end parts of the uppermost step, and arranged in parallel. Alternatively, the linear conductive segments are arranged so as to straddle an innermost step of the stepwise conductive segment and innermost steps of the stepwise conductive segments located on both sides of the stepwise conductive segment, and arranged closely and in parallel.

Description

The present invention relates to a coordinate input panel of a coordinate input system that detects a touch position with a finger or a coordinate indicator.

FIG. 15 shows a conventional coordinate input panel 1 having a rectangular coordinate input area 8, and a resistive surrounding surrounding the surface resistor 2 so as to be electrically connected to the uniform surface resistor 2. An electrode 3 is disposed, and detection electrodes 4, 5, 6, and 7 are provided at four vertices. The detection electrodes 4, 5, 6, and 7 are electrically connected to the resistive surrounding electrode 3. The coordinate input area 8 is on the surface resistor 2 and inside the resistive surrounding electrode 3.
As a coordinate detection method of the coordinate input system using the coordinate input panel 1, a signal is transmitted from a coordinate indicator (hereinafter referred to as an input pen) such that the coordinate input panel 1 is a receiving side, and capacitive coupling or A method in which the surface resistor 2 receives a signal transmitted from the input pen through direct contact with the surface resistor 2, and further, the entire surface resistor 2 is voltage-vibrated and designated by a finger or a conductor. A method for detecting the position of a point on the input panel side, and a signal drive for each part of the surface resistor 2 such that the direction of signal transmission is opposite to this and the coordinate input panel 1 is on the transmission side. There is a method of receiving coordinate signals with a pen.
When the coordinate input panel 1 is the receiving side, it is known to measure the current value distributed to the four vertices (4, 5, 6, and 7) of the current that enters and exits one point of the surface resistor 2. {See Japanese Patent No. 3237629 (Patent Document 1)}. On the other hand, when the coordinate input panel 1 is the transmitting side, a potential gradient is applied to the surface resistor 2 from the outside through the detection electrodes 4, 5, 6, and 7, and the voltage level at the designated coordinate point is detected by the input pen. Things are known. The coordinates of the position indicated by the finger or the input pen are calculated using the distribution value of the current flowing in and out of the surface resistor 2 to the four vertices or the voltage measured with the input pen when driving the four vertices. Moreover, as a coordinate detection method when the coordinate input area 8 of the coordinate input panel 1 is not a rectangle but a general polygon, for example, Japanese Patent Application Laid-Open No. 2010-86088 (Patent Document 2) by the same applicant exists. To do.
In the coordinate input system described above, in order to accurately detect the position of a point where a finger or a conductive material (coordinate input indicator, for example, an input pen) is close to or in contact with the surface resistor, it occurs in the coordinate input area 8. It is necessary to make the potential distribution or current distribution uniform. It is known that when the resistance value per side of the resistive surrounding electrode 3 or the resistivity per length is high, the position detection of the contact point is shifted. For this reason, when designing a coordinate input panel, it is preferable that the resistance value of the resistive surrounding electrode 3 is as low as possible with respect to the resistance value of the surface resistor 2. However, if the resistance value of the resistive surrounding electrode 3 is set too low, the power consumption increases or the drive current that gives a potential gradient is large, and a DC or AC potential gradient is forcibly created in the surface resistor 2. Inconvenience in circuit control such as failure to perform the operation occurs. On the other hand, if the resistance value of the surface resistor 2 is increased, the resistance value of the resistive surrounding electrode 3 can be relatively lowered. However, if the resistance value of the surface resistor 2 is increased, the resistance value is weakened by noise. There was a problem. Therefore, it is desired that the resistive surrounding electrode 3 has an appropriate resistance value.
In order to set the resistance value of the resistive surrounding electrode 3 to an appropriate value, for example, there is a method in which a material having a certain resistivity is applied linearly to form each side of the resistive surrounding electrode 3. . The resistance per side of the resistive surrounding electrode made by this method is linear with respect to length. However, if silver is used as the material to be applied, for example, since the resistivity of silver is low, each side of the resistive surrounding electrode 3 must have a very narrow width in order to obtain an appropriate resistance value. The formation method is difficult. In addition, silver mixed with carbon and increased resistance is suitable for forming peripheral electrodes, but it is necessary to mix different materials, making it difficult to maintain a stable resistance in the manufacturing process. It is. Further, when the sheet resistance of each panel is different, it is necessary to reexamine the design of the resistance value of the resistive surrounding electrode 3.
Another method for forming the resistive surrounding electrode 3 is to form a discontinuous pattern using a segment of a conductive material having a low resistance (for example, silver ink), and the resistance of the surface resistor 2 existing in the gap, There is one that realizes a predetermined resistance value (for example, see Japanese Patent Application No. 2005-530274 (Patent Document 3) or Japanese Patent Application No. 2009-271653 (Patent Document 4)). In these methods, the arrangement pattern of the conductive segments for making the potential distribution or current distribution uniform is complicated, or the area of the resistive surrounding electrode is higher than the ratio of the entire area of the coordinate input panel. In many cases, it is difficult to design the resistance value of the resistive surrounding electrode 3.
Furthermore, the manufacturing method of the coordinate input panel 1 covers the surface resistor 2 on the transparent base material which consists of organic or inorganic material, and forms the resistive surrounding electrode 3 on it.
At that time, depending on the coating method of the surface resistor 2, there may be a variation in resistance value for each panel, and the resistance of the resistive surrounding electrode 3 may need to be adjusted for each panel.

Patent registration No. 3237629 JP 2010-86088 A Special table 2005-530274 Japanese Patent Application No. 2009-271893

The present invention has been made in consideration of such points, and a single conductive material that does not require mixing of materials can be used as the material of the resistive surrounding electrode, and the resistance value of the resistive surrounding electrode can be used. It is an object of the present invention to provide a coordinate input panel having a pattern of resistive surrounding electrodes that can easily implement the above design and eliminates coordinate detection adjustment due to variations in sheet resistance for each panel.

The present invention includes a surface resistor and at least three or more substantially linear resistive surrounding electrodes formed on the surface resistor, and the ends of the resistive surrounding electrodes are electrically connected to each other by a detection electrode. A coordinate input panel in which the detection electrode is a corner apex, and a portion surrounded by the at least three resistive surrounding electrodes is a coordinate input region, and is located inside the surface resistor In the arranged first conductive segments, linear conductive segments of the same length are alternately arranged in a broken line, and the second conductive segment is a surface of the first linear conductive segment. The conductive segments having at least two steps or more provided outside the resistor and having the at least two steps or more are conductive segments having the respective steps. But close to each other and flat Each of the different steps of the adjacent staircase-shaped conductive segments adjacent to each other has at least one adjacent and adjacent center, and the center of the innermost step of the second staircase-shaped conductive segment. The first linear conductive segment is adjacent to the first linear conductive segment, and the first linear conductive segments located on both sides of the linear conductive segment are connected to the second step-shaped conductive segment. Adjacent to the innermost step of the conductive segment and the innermost step of the second step-shaped conductive segment located on both sides of the step-shaped conductive segment. The conductive segments having the staircase shape, which is the second conductive segment having at least two steps, are arranged so that the conductive segments having the staircase shapes are adjacent to each other and arranged in parallel. A coordinate input panel characterized in that a resistive peripheral electrode having a pattern having at least one place adjacent to each other in adjacent steps of the step-shaped conductive segment is provided as a first gist. It consists of a surface resistor and at least three or more substantially linear resistive surrounding electrodes formed on the surface resistor, and the ends of the resistive surrounding electrodes are electrically connected to each other by a detection electrode. A coordinate input panel having the detection electrode as a corner vertex and a portion surrounded by the at least three or more resistive surrounding electrodes as a coordinate input region, and arranged inward with respect to the surface resistor. In one conductive segment, first linear conductive segments having the same length are arranged in a broken line, and the second conductive segment is a sheet resistor of the first linear conductive segment. Against The conductive segments having a staircase shape of at least two steps provided on the side and having the staircase shape of at least two steps are adjacent to each other. The different steps of the adjacent step-shaped conductive segments arranged in parallel have at least one location adjacent to each other, and the first linear conductive segment is the second linear conductive segment. The staircase-shaped conductive segment is disposed adjacent to each other so as to straddle the innermost step of the staircase-shaped conductive segment and the innermost step of the staircase-shaped conductive segment located on both sides of the staircase-shaped conductive segment. In addition, the conductive segments having the second staircase shape having at least two steps are adjacent to each other in such a manner that the conductive segments having the respective staircase shapes are arranged close to each other in parallel. A second aspect of the coordinate input panel is characterized in that a resistive peripheral electrode having a pattern having at least one location adjacent to each other in adjacent steps of the step-shaped conductive segment is provided. The second step-like segment provided outside the one linear conductive segment is one in which at least two or more conductive segments are arranged, and the line resistor is arranged in the broken line shape among the surface resistors. The first linear conductive segment and the region surrounded by the stepwise conductive segments arranged side by side, and comprising at least two or more steps constituting a resistive peripheral electrode provided so as to surround the surface resistor The shape of the conductive segments formed in the shape is line symmetric at the center of each resistive surrounding electrode, and the conductive segments formed in the respective step shapes are arranged close to each other in parallel, The coordinate input according to claim 1 or 2, wherein a resistive peripheral electrode having a pattern in which at least two adjacent portions adjacent to each other in the stepped conductive segments are adjacent to each other is provided. With the panel as the third gist, the end of the resistive surrounding electrode electrically connected to the detection electrode is terminated with the vicinity of the detection electrode as the end of the resistive surrounding electrode, and the first linear conductive The segment has a gap with the detection electrode, and the end of the second stepped conductive segment closest to the first linear conductive segment is directly connected to the detection electrode. The coordinate input panel according to any one of claims 1 to 3, wherein the coordinate input panel is a fourth gist, and comprises a surface resistor and at least four or more substantially resistive peripheral electrodes formed on the surface resistor. The second staircase shape The pattern of the conductive segments is a pattern in which the interval between the first stage adjacent to the first linear conductive segment and the second stage is wider than the interval between the second stage and the third stage. The coordinate input panel according to any one of claims 1 to 3, wherein a resistive surrounding electrode is provided.

According to the coordinate input panel of the present invention, since a single conductive material can be used as the material of the resistive surrounding electrode, the resistance value of the resistive surrounding electrode can be stabilized, and the yield in the manufacturing process can be stabilized. Can be raised. In addition, if low resistance silver is used as the material for the resistive surrounding electrode, the same material as the sensing electrode can be used, so the sensing electrode and the resistive surrounding electrode can be formed simultaneously by printing or the like. Costs can be reduced as compared with separate formation.
In addition, when the dimensions of the coordinate input panel are changed, it has been necessary to change the resistance value per side of the resistive surrounding electrode, but this can be easily done by expanding / shrinking the pattern or increasing / decreasing the number of steps in the stepped segment. Thus, the resistance value can be adjusted, and the area can be made smaller than that of the conventional resistive surrounding electrode.
In addition, since the surface resistor is incorporated as a part of the resistive peripheral electrode as it is, it is possible to form a resistive peripheral electrode that compensates for variations in resistance value for each panel during the manufacture of the surface resistor. It is possible to eliminate resistance value adjustment due to variations in sheet resistance.

Schematic diagram of coordinate input panel Schematic diagram of coordinate input panel Configuration diagram showing an example of a coordinate input system Partial enlarged view of resistive surrounding electrode Partial enlarged view of resistive surrounding electrode Partial enlarged view of resistive surrounding electrode Partial enlarged view of resistive surrounding electrode Partial enlarged view of resistive surrounding electrode Conceptual diagram of resistive surrounding electrode Schematic diagram of potential distribution of surface resistors formed on the surface of the coordinate input panel Schematic diagram of potential distribution of surface resistors formed on the surface of the coordinate input panel Conceptual diagram of resistive surrounding electrode Partial equivalent circuit enlarged view of part of resistive surrounding electrode Partial enlarged view of resistive surrounding electrode Conventional rectangular coordinate input panel Dimensions of resistive surrounding electrodes used in the examples Dimensions of resistive surrounding electrodes used in the examples

Hereinafter, preferred embodiments of a coordinate input panel according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 2 is a schematic view of a polygonal coordinate input panel 11 according to the present invention (FIG. 2 shows an example of a quadrangle). The coordinate input panel 11 forms a uniform surface resistor 12 on a base material (not shown) and is a resistive peripheral electrode surrounding the surface resistor 12 so as to be electrically connected to the surface resistor 12. 13, and detection electrodes 14, 15, 16, and 17 are formed at the respective vertices. The resistive surrounding electrode 13 is composed of a plurality of elongated first linear conductive segments 41a and a step-shaped conductive segment 41b obtained by combining straight lines, and a gap between the surface resistor 12 and the adjacent conductive segments. It consists of an aggregate with the parts that make up. The coordinate input area 18 indicates an area inside the resistive surrounding electrode 13.
As the base material (not shown) of the coordinate input panel 11, for example, soda glass can be used, but the material is not particularly limited, and a transparent ceramic material containing arbitrary glass, or an acrylic resin, Transparent resin materials such as polyethylene terephthalate resin can be used. Depending on the application, an opaque insulating substrate may be used.
In general, tin oxide, tin oxide added with antimony (ATO), indium oxide, and tin are added as materials of the conductive thin film of the surface resistor 12 that covers the base material (not shown) of the coordinate input panel 11. Indium oxide (ITO), indium oxide added with zinc (IZO), zinc oxide, or the like is used. Examples of the coating method include a physical sputtering method, a vacuum deposition method, an ion plating method, a chemical spray method, a dipping method, and a chemical vapor deposition method (CVD method).
The conductive segment that constitutes the resistive surrounding electrode 13 uses a low resistance conductive ink in which single metal fine particles of a noble metal such as silver or gold or a metal such as copper, tin, or nickel are dispersed. There are a method in which a pattern is formed by a method such as a screen method or a dispenser method, followed by baking, and a method in which the metal is patterned by plating. The detection electrodes 14 to 17 at the apexes are for connecting the lead wires 22, 23, 24, and 25, and can be formed by printing and baking a solderable conductive ink if it is a wire, or flexible. In the case of a cable (FFC or FPC), it is formed by bonding with a conductive adhesive or a conductive film. In the case of the conductive ink for forming the detection electrodes 14 to 17, since the same one that forms the conductive segment constituting the resistive surrounding electrode 13 can be used, the detection electrodes 14 to 17 and the resistance ink The conductive segment constituting the conductive surrounding electrode 13 can be formed by printing and baking in one process.
Further, although not shown, when capacitive coupling is used for interaction between the finger or the coordinate indicator and the surface resistor 12, a transparent insulating substrate is provided on the surface resistor 12 in order to protect the surface resistor 12. May be coated.

FIG. 3 is a configuration diagram showing an example of a coordinate input system using the coordinate input panel 11 of the present invention, in which the coordinate input panel 11 is on the receiving side. 2 is a configuration diagram of a coordinate input system that detects a position coordinate indicated by a finger 21 in a coordinate input area 18 of a coordinate input panel 11. FIG. As described above, the surface of the surface resistor 12 is insulated so that the finger 21 does not touch the surface resistor 12 directly, thereby transmitting a signal by capacitive coupling between the finger 21 and the surface resistor 12. Alternatively, the signal may be transmitted by direct electrical contact between the finger 21 and the surface resistor 12 without being insulated. Here, the case where the surface of the surface resistor 12 is covered with a transparent insulating base material for insulation treatment will be described. A resistive peripheral electrode 13 is formed on the uniform sheet resistor 12 using the pattern shown in FIG. 2a on each side, and the inside surrounded by the resistive peripheral electrode 13 is used as a coordinate input area 18 (see FIG. 3). Shows an example of a quadrangle). On the resistive surrounding electrode 13, the positions corresponding to the vertices of the polygonal coordinate input region 18 are set as detection electrodes 14 to 17, and lead lines 22, 23, 24, and 25 are respectively connected to the detection electrodes 14 to 17. Furthermore, the lead wires 22 to 25 are connected to an oscillating voltage application circuit 27 in the analog signal processing unit 26.
When detecting the coordinates, the oscillating voltage generator 28 serving as an AC signal source applies an oscillating voltage to the oscillating voltage applying circuit 27, and the oscillating voltage applying circuit 27 oscillates the corresponding detection electrodes 14 to 17 with low impedance. In addition, the current flowing from the detection electrode to the analog multiplexer 29 is output. As a simple example, a transistor base is vibrated by an AC signal, an emitter is connected to a detection electrode, and a current is output from a collector.
The vibration resistance generator 28 serving as an AC signal source causes voltage oscillation of the entire surface resistor 12. As is known in the art, the human body has a grounding effect on the AC signal. When the human finger 21 contacts or approaches the surface resistor 12, the surface resistor is passed through the fingertip by capacitive coupling. AC signal current flows between The detection electrodes 14 to 17 are connected to an A / D converter (analog / digital converter) 30 through an analog multiplexer 29, and a voltage proportional to the current flowing through each detection electrode is applied to the A / D converter 30. The current value flowing from the fingertip through the surface resistor 12 and distributed to the detection electrodes 14 to 17 can be obtained as a voltage value as a digital value. The CPU 31 sequentially switches the connection destination of the oscillating voltage application circuit connected to the analog multiplexer 29 (not shown), inputs the digital value output from the A / D converter 30, and sets the indication position of the finger 21 or the input pen. Calculate the coordinates. In order to calculate the coordinates of the indicated position, for example, an equation as disclosed in Japanese Patent No. 3237629 (Patent Document 1) can be used. CPU31 outputs the calculated coordinate and a coordinate is utilized by the apparatus of a back | latter stage.
Further, when a signal is transmitted from the input pen, measurement can be performed in the same manner.

Next, the resistive surrounding electrode 13 based on Claim 1 is demonstrated. 4a and 4b are enlarged views of the resistive surrounding electrode 13 of FIG. 1a. Note that FIG. 4b shows a shape joined at the vertical portion of the staircase pattern. 4 shows a central portion of the lower side among the four sides arranged on the surface resistor 12 of the rectangular coordinate input panel 11. In the present embodiment, the resistive surrounding electrode 13 is formed by two types of conductive segments, a first linear conductive segment 41a and a second stepped conductive segment 41b. 4c is an application example of FIGS. 4a and 4b, in which the first linear conductive segment 41a, the second stepped conductive segment 41b, and the third dashed conductive segment on the outermost side. The resistive surrounding electrode 13 is formed by 41c.
If the distance 53 between the first linear conductive segments 41a on one side of the resistive surrounding electrode 13 is too far away, distortion may occur in the detection of the coordinate position in the vicinity of the resistive surrounding electrode. .
Therefore, although the distance of an interval changes with the means to input, the distance of less than half of the width of the member to input is suitable. For example, in the case of input by a finger, 5 mm or less, which is a half of the finger width (about 10 mm), is desirable. Further, the lengths of adjacent pieces of the first linear conductive segments 41a are at least alternately the same length, and there is no problem even if the adjacent pieces have the same length. What is necessary is just to select suitably so that the space | interval of this conductive segment 41a may be satisfy | filled.
The first linear conductive segment 41a is the uppermost step of the second step-shaped conductive segment 41b adjacent to the first linear conductive segment 41a (in the coordinate input area 18 of the resistive surrounding electrode 13). One piece is placed in the center of the nearest step), and half of one piece hangs at both ends of the uppermost step, and they are arranged in parallel. In the case of the resistive surrounding electrode 13 of FIGS. 4a and 4b, the distance between the first linear conductive segment 41a and the second stepped conductive segment 41b is between the second stepped conductive segments 41b. It designs suitably according to the relationship of resistance value. Also in the case of the resistive surrounding electrode 13 of FIG. 4c, the distance between the first linear conductive segment 41a and the second stepped conductive segment 41b, and between the second stepped conductive segment 41b. Design appropriately according to the relationship between the resistance value, the length of the third linear conductive segment 41c, and the resistance value of the second stepped conductive segment 41b and the third linear conductive segment 41c. .
Further, the second step-like conductive segment 41b is arranged such that the step-like constituent members are adjacently overlapped in parallel and have at least two steps overlapping in parallel. Further, in the stepped step shape, the step corner may be an acute angle or an obtuse angle, or may be rounded.
The conductive segment 41b closest to the edge of the resistive surrounding electrode 13, that is, the detection electrode (14, 15, 16 and 17 in FIG. 1a) is electrically linear on one side of the resistive surrounding electrode 13. Arrange them so that the resistance value changes.
Next, the resistive surrounding electrode 13 based on Claim 2 is demonstrated. FIGS. 5a and 5b show partially enlarged views of the resistive surrounding electrode 13 of FIG. 1b. 4 shows a central portion of the lower side among the four sides arranged on the surface resistor 12 of the rectangular coordinate input panel 11. In the present embodiment, the resistive surrounding electrode 13 is formed by two types of conductive segments, a first linear conductive segment 41a and a second stepped conductive segment 41b. 5c is an application example of FIGS. 5a and 5b, in which the first linear conductive segment 41a, the second stepped conductive segment 41b, and the third dashed conductive segment on the outermost side. The resistive surrounding electrode 13 is formed by 41c.
If the distance between the first linear conductive segments 41a on one side of the resistive surrounding electrode 13 is too far away, the coordinate position detection in the vicinity of the resistive surrounding electrode may be distorted.
Therefore, although the distance of an interval changes with the means to input, the distance of less than half of the width of the member to input is suitable. For example, in the case of input by a finger, 5 mm or less, which is a half of the finger width (about 10 mm), is desirable. Moreover, the length of the adjacent piece of the first linear conductive segment 41a may be the same length, and may be appropriately selected so as to satisfy the interval between the first linear conductive segments 41a. The first linear conductive segment 41a is the uppermost step of the second step-shaped conductive segment 41b adjacent to the first linear conductive segment 41a (in the coordinate input area 18 of the resistive surrounding electrode 13). Half of one piece hangs at both ends of the nearest side step) and is arranged in parallel. In the case of the resistive surrounding electrode 13 of FIGS. 4a and 4b, the distance between the first linear conductive segment 41a and the second stepped conductive segment 41b is between the second stepped conductive segments 41b. It designs suitably according to the relationship of resistance value. Also in the case of the resistive surrounding electrode 13 of FIG. 4c, the distance between the first linear conductive segment 41a and the second stepped conductive segment 41b, and between the second stepped conductive segment 41b. Design appropriately according to the relationship between the resistance value, the length of the third linear conductive segment 41c, and the resistance value of the second stepped conductive segment 41b and the third linear conductive segment 41c. .
Further, the second step-like conductive segment 41b is arranged such that the step-like constituent members are adjacently overlapped in parallel and have at least two steps overlapping in parallel. Further, in the stepped step shape, the step corner may be an acute angle or an obtuse angle, or may be rounded.
The conductive segment 41b closest to the edge of the resistive surrounding electrode 13, that is, the detection electrode (14, 15, 16, and 17 in FIG. 1b) is electrically linear on one side of the resistive surrounding electrode 13. Arrange them so that the resistance value changes.
Next, the resistive surrounding electrode 13 based on Claim 3 is demonstrated. FIG. 7 shows a partially enlarged view of the resistive surrounding electrode 13 of FIG. 2a. Of the four sides arranged on the surface resistor 12 of the rectangular coordinate input panel 11, the left half of the lower side is shown together with the detection electrode 17. In the present embodiment, half of one side is formed by two types of conductive segments, a first linear conductive segment 41a and a second stepped conductive segment 41b. The arrangement, configuration, and the like of the resistive surrounding electrode shown are the same. On the other hand, the conductive segment 41b closest to the center of the side is connected to the conductive segment closest to the center of the side among the conductive segments in the right half of the lower side having a symmetrical arrangement with respect to the center of the side. The step shape of the second step-like conductive segment is preferably lower left in the lower half shown in FIG. 7 and lower right in the right half. In the left half of the lower side, it may be stepped downward to the right, and in the right half, conversely to the left. The arrangement pattern of the conductive segments is preferably symmetric with respect to the center of each side of the resistive surrounding electrode 13. However, the arrangement pattern need not be the same between the sides. By making line symmetry, the pattern in the vicinity of the detection electrode can be made symmetrical, and the resistance change due to the length of the resistive surrounding electrode can be made more linear. Further, in the stepped step shape, the step corner may be an acute angle or an obtuse angle, or may be rounded.
If the number of the conductive segments constituting one side is large, it is possible to reduce the distortion of the calculation result of the coordinates of the indicated position in the coordinate input area 18 to the middle of the resistive surrounding electrode 13. However, as the number of conductive segments increases, the total resistance value formed by the gaps tends to increase.
On the other hand, when the conductive segment is lengthened, the overlapping portion with the opposing conductive segment becomes large, and the resistance value of the resistive surrounding electrode 13 can be lowered. However, since the conductive segment becomes long, even if the finger moves, the change in the signal distributed from the finger is reduced, and an accurate position cannot be detected. Therefore, the length of the first linear conductive segment 41a is adjusted and formed on the coordinate input region side of the second stepped conductive segment 41b, and the first linear conductive segment 41a 3 By extending the length of the second step-like conductive segment 41b to the length, an accurate position can be detected.
As described above, by adjusting the number of conductive segments, the gap, the overlapping length, and the like, the resistance value per side of the resistive surrounding electrode 13, that is, the resistance value between adjacent detection electrodes is in an appropriate range. There is a need.
The AC signal from the finger 21 flows through the surface resistor 12 and measures the current value distributed to the detection electrodes 14 to 17 via the resistive surrounding electrode 13 to calculate the coordinates of the indicated position. When the surrounding electrode 13 and the finger 21 are close to each other, a phenomenon occurs in which an AC signal flows directly from the finger 21 to the second or lower stage of the second stepped conductive segment. (Signal jump)
When the signal jump from the finger 21 exists, the calculated coordinates tend to shift in the direction in which the uppermost step of the second step-like conductive segment where the signal jumps from the finger 21 is located.
In order to solve the above problem, as shown in FIG. 8, the pattern of FIGS. 4 and 5 is formed from the uppermost step of the second step-like conductive segment 41b adjacent to the first linear conductive segment 41a. By expanding the interval of the second step, it is possible to suppress the jump from the finger 21 to the second step or less of the second stepped conductive segment 41b. Suppressing this contributes to the accuracy of the coordinate calculation result immediately before the resistive surrounding electrode 13. When the interval between the steps is widened, it is necessary to appropriately increase the number of steps in order to adjust the resistance value to an appropriate value.
FIG. 9 is a conceptual diagram for explaining a partially enlarged view of the resistive surrounding electrode 13 shown in FIGS. 6 and 7. In FIG. 9, the first linear conductive segment 41a and the second step-shaped conductive segment 41b are shown by a finer straight line than the actual two segments, and gaps are formed in order to clarify the arrangement pattern. Widely shown. Of the surface resistor 12 (not shown), the gap portion 43c of the second step-like conductive segment 41b shown in FIG. This contributes most to the resistance value per side of the electrode 13. More precisely, although there is a resistance value of the conductive segment itself, it is very small compared with the resistance value between the conductive segments and can be ignored.
The portion of the surface resistor 12 shown by 43a to 43c in FIG. 9A is equivalent to the resistance of the gap between the adjacent conductive segments 41a or 41b in parallel, as shown in FIG. 9B. Can be expressed as resistors 42a to 42c. That is, in consideration of the length of the stepped overlapping parallel portion, the parallel portion perpendicular to the step layer, and the electrical spread at the adjacent end portion, the resistive surrounding electrode 13 has the equivalent resistance 42a. It can be considered that ˜42c is connected in series and parallel. The resistance values of the equivalent resistors 42a to 42c are the resistance value of the surface resistor 12, the distance d between the gaps of the adjacent conductive segments 41a or 41b arranged in parallel, and the two overlapping lengths. It can be obtained by the sum w of the lengths L1 and L2 and the length H of the vertical portions of the step layers overlapping in parallel.
The resistance value of the surface resistor 12 is generally represented by sheet resistance. When the sheet resistance of the surface resistor 12 is ρ (Ω / □), the resistance value of the resistor 42 can be calculated by the equation ρ × d / w (Ω). Further, if resistance is calculated using the gaps between the conductive segments and the overlapping lengths, one side of the resistive surrounding electrode 13 becomes a series-parallel resistance circuit, and the combined resistance can be easily calculated.
Next, the linearity of resistance on one side of the resistive surrounding electrode will be described.
FIG. 10 is a schematic diagram of the potential distribution of the surface resistor formed on the surface of the coordinate input panel. A voltage is applied to the detection electrode 4 among the four detection electrodes 14, 15, 16, and 17 of FIG. The potential distribution generated in the surface resistor 12 when the electrode 16 is grounded is indicated by an equipotential line 45.
At this time, when the linearity of the resistance value of the resistive surrounding electrode 13 is good between the detection electrodes 14-15, 15-16, 16-17, and 17-14, that is, the resistance value per unit length is constant. In this case, the equipotential line 45 is a straight line. On the other hand, when the linearity of the resistance value of the resistive surrounding electrode 13 is poor, for example, when the resistance value is abnormal near 46 of the resistive surrounding electrode 13, the equipotential line 45 is distorted as shown in FIG. As a result, the accuracy of coordinate detection is degraded.
In the resistive surrounding electrode 13 according to the present invention, since the first conductive segments 41 are arranged in a broken line shape, the linearity of the resistance value is determined by using the distance between the central portions of the first conductive segments 41a. What is necessary is just to design so that the resistance value per unit length may become constant.
12a is a partial enlarged view of a part of the resistive surrounding electrode 13 of one embodiment according to the present invention (resistance components are shown in FIGS. 47a to 47f), and FIG. 12b is an equivalent circuit diagram of FIG. 12a.
R1 and R2 are resistance values due to the length of the first conductive segment 41a of the resistive surrounding electrode 13, R3 is resistance values due to the length of the second conductive segment 41b of the resistive surrounding electrode 13, R4, R4, R6 is the resistance value due to the gap between the patterns.
In FIG. 12b, assuming that R4, R5, and R6 are negligibly larger than R1, R2, and R3, the equivalent circuit between A is as shown in FIG. 13a, and the resistance value Ra between A is 2 × R2 ×. (R2 + R3) / (2 × R2 + R3).
Similarly, the equivalent circuit between B is as shown in FIG. 13B, and the resistance value between B is R × 2 × R1 + (2 × R2 × R3) / (2 × R2 + R3).
When the above equation is solved by R1 so that the resistance values between A and B are equal, R1 = R2 ^ 2 / (2 × R2 + R3).
Therefore, by using this equation, the length of the broken line of the first conductive segment 41a in FIG. 12a is alternately made the same length so that the resistance values become R1 and R2, thereby the resistive surrounding electrode 13 The linearity of the resistance value can be improved. Actually, there are some errors due to R4, R5, and R6, so adjustment may be made as necessary.
Further, in the vicinity of the detection electrodes 14 to 17, since R3, R4, and R5 have different values from other portions, the detection electrodes 14 to 17 are brought into contact with each other so that the resistance linearity of the resistive surrounding electrode 13 is improved. The length of the pattern can be adjusted as appropriate.
Further, in order to efficiently perform pattern design in the vicinity of the detection electrodes 14 to 17 with good linearity of the resistance value of the resistive surrounding electrode 13, the resistive surrounding electrode 13 is provided as shown in FIGS. 2 a and 2 b. It is preferable to arrange the resistive surrounding electrode 13 so as to be line symmetric at the center.
Next, the resistive surrounding electrode 13 based on claim 4 will be described. FIGS. 14a to 14c are partial enlarged views of the resistive surrounding electrode 13 of FIG. 1a or FIG. 2a. Of the four sides arranged on the surface resistor 12 of the rectangular coordinate input panel 11, the left half of the lower side is shown together with the detection electrode 17. In the present embodiment, when the vicinity of the detection electrode 17 is the end of the resistive surrounding electrode 13, the first linear conductive segment 41 a is indirectly in contact with the detection electrode 17 via the surface resistor 12. is doing. On the other hand, the second step-like conductive segment 41b is directly connected to the detection electrode 17 at a step close to the first linear conductive segment 41a. Further, the step of the second step-like conductive segment 41 b other than the step close to the first linear conductive segment 41 a and the detection electrode 17 are electrically linear on one side of the resistive surrounding electrode 13. Either direct contact or indirect contact through the surface resistor 12 is appropriately selected and arranged so as to change the resistance value.
Next, the resistive surrounding electrode 13 based on claim 5 will be described. As shown in FIG. 3, the AC signal from the finger 21 flows through the surface resistor 12, the current value distributed to the detection electrodes 14 to 17 through the resistive surrounding electrode 13 is measured, and the coordinates of the indicated position are calculated. However, when the resistive surrounding electrode 13 and the finger 21 are close to each other, a phenomenon occurs in which an AC signal flows directly from the finger 21 to the second or lower stage of the second stepped conductive segment. (Signal jump)
When the signal jump from the finger 21 exists, the calculated coordinates tend to shift in the direction in which the uppermost step of the second step-like conductive segment where the signal jumps from the finger 21 is located.
To solve the above problem, the second stepped conductive segment adjacent to the first linear conductive segment 41a as shown in FIG. 8 (only FIG. 4a is shown) in the pattern of FIGS. By expanding the distance between the uppermost step of 41b and the second step from the top, it is possible to prevent the finger 21 from jumping into the second step or less of the second stepped conductive segment 41b. Suppressing this contributes to the accuracy of the coordinate calculation result immediately before the resistive surrounding electrode 13. When the interval between the steps is widened, it is necessary to appropriately increase the number of steps in order to adjust the resistance value to an appropriate value.

  As described above, the resistance value of the resistive surrounding electrode is determined by the resistance value of the surface resistor 12 and the pattern of the conductive segment. Therefore, in the past, when the resistance value of the surface resistor is different for each panel, it is necessary to change / adjust the resistance value of the resistive surrounding electrode to an appropriate value accordingly. Since the resistance value of the resistive surrounding electrode changes due to the change in the resistance value of the surface resistor 12, the resistance of the resistive surrounding electrode due to variations in the surface resistance from panel to panel becomes unnecessary.

Hereinafter, the present invention will be described with reference to examples and comparative examples. The present invention is not limited to the following examples, and includes various modifications within the technical scope of the present invention.
Example 1
Example 1
The coordinate input panel 11 was created as follows. A glass substrate made of soda glass (thickness 3 mm) cut to a size of about 469 × 375 mm is used, and an ITO (indium oxide added with tin) film (sheet) is formed on the surface of the glass substrate by sputtering. A sheet resistor 12 was formed by forming a resistance value of 300Ω / □. Next, the conductive segments of the resistive surrounding electrode 13 and the detection electrodes 14 to 17 were formed by screen-printing and heat-curing silver paste LS-504 (resin binder) manufactured by Asahi Chemical Laboratory. .
The pattern of the resistive surrounding electrode 13 is the same as that of FIG. 4a, and one piece has a line-symmetric shape as shown in FIG. 2a, and the four corners are at least a second step-like conductive segment 41b as shown in FIG. 14a. However, it was directly connected to the detection electrode 17 at a stage close to the first linear conductive segment 41a. Moreover, the conductive segment produced the coordinate input panel 11 on the dimension conditions of Table 1 (refer FIG. 16a).

（実施例２）
実施例１において、導電性セグメントを、表１の寸法条件（図１６ａ参照）のパターンを用いた以外は、実施例１と同作成条件で座標入力パネル１１を作成した。
（実施例３）
抵抗性周囲電極１３のパターン図４ｂのパターンを用い、一片を図１ａの様な同じ形状が連なるようにし、四隅は図１４ｂに示したように少なくとの第二の階段状の導電性セグメント４１ｂが、第一の直線状の導電性セグメント４１ａに近い段で、検出電極１７に直接接続させた。また、導電性セグメントが、表１の寸法条件（図１６ｂ参照）のパターンを用いた以外は、実施例１と同作成条件で座標入力パネル１１を作成した。
（実施例４）
実施例３の図１ａにおいて、対辺を対称にし、導電性セグメントが表１の寸法条件（図１６ｂ参照）のパターンを用いた以外は、実施例１と同作成条件で座標入力パネル１１を作成した。
（実施例５）
抵抗性周囲電極１３のパターン図４ｃのパターンを用い、一片を図２ａの様な線対称の形状にし、四隅は図１４ｃに示したように少なくとの第二の階段状の導電性セグメント４１ｂが、第一の直線状の導電性セグメント４１ａに近い段で、検出電極１７に直接接続させた。また、導電性セグメントが、表１の寸法条件（図１６ｃ参照）のパターンを用いた以外は、実施例１と同作成条件で座標入力パネル１１を作成した。
（実施例６）
実施例５において、導電性セグメントが、表１の寸法条件（図１６ｃ参照）のパターンを用いた以外は、実施例１と同作成条件で座標入力パネル１１を作成した。
（実施例７）
抵抗性周囲電極１３のパターン図５ａのパターンを用い、一片を図２ｂの様な線対称の形状にし、四隅は図１４ａに示したように少なくとの第二の階段状の導電性セグメント４１ｂが、第一の直線状の導電性セグメント４１ａに近い段で、検出電極１７に直接接続させた。また、導電性セグメントが、表１の寸法条件（図１７ａ参照）のパターンを用いた以外は、実施例１と同作成条件で座標入力パネル１１を作成した。
（実施例８）
抵抗性周囲電極１３のパターン図５ｂのパターンを用い、一片を図１ｂの様な同じ形状が連なるようにし、対辺が対称にし、四隅は図１４ｂに示したように少なくとの第二の階段状の導電性セグメント４１ｂが、第一の直線状の導電性セグメント４１ａに近い段で、検出電極１７に直接接続させた。また、導電性セグメントが、表１の寸法条件（図１７ｂ参照）のパターンを用いた以外は、実施例１と同作成条件で座標入力パネル１１を作成した。
（実施例９）
抵抗性周囲電極１３のパターン図５ｃのパターンを用い、一片を図２ｂの様な線対称の形状にし、四隅は図１４ｃに示したように少なくとの第二の階段状の導電性セグメント４１ｂが、第一の直線状の導電性セグメント４１ａに近い段で、検出電極１７に直接接続させた。また、導電性セグメントが、表１の寸法条件（図１７ｃ参照）のパターンを用いた以外は、実施例１と同作成条件で座標入力パネル１１を作成した。
（実施例１０）
実施例１において、図８のように第一の直線状の導電性セグメント４１ａに最も近い第二の階段状セグメントの段を変更したパターンにした。また、導電性セグメントが、表１の寸法条件（図１６ａ参照）のパターンを用いた以外は、実施例１と同作成条件で座標入力パネル１１を作成した。
（実施例１１）
実施例４において、図８のように第一の直線状の導電性セグメント４１ａに最も近い第二の階段状セグメントの段を変更したパターンにした。また、導電性セグメントは、導電性セグメントが、表１の寸法条件（図１６ｂ参照）のパターンを用いた以外は、実施例１と同作成条件で座標入力パネル１１を作成した。
（実施例１２）
実施例５において、図８のように第一の直線状の導電性セグメント４１ａに最も近い第二の階段状セグメントの段を変更したパターンにした。また、導電性セグメントは、導電性セグメントが、表１の寸法条件（図１６ｃ参照）のパターンを用いた以外は、実施例１と同作成条件で座標入力パネル１１を作成した。
（実施例１３、１４、及び、１５）
実施例１において、破線長さＡ（５１）、破線長さＢ（５２）、破線間隔（５３）を変更したパターンにした。また、導電性セグメントが、表１の寸法条件（図１６ａ参照）のパターンを用いた以外は、実施例１と同作成条件で座標入力パネル１１を作成した。
（実施例１６、１７、及び、１８）
面抵抗体１２のシート抵抗値を５００、７００、及び、９００Ω／□にした以外は実施例１と同条件にて座標入力パネル１１を作成した。
（実施例１９、２０、及び、２１）
面抵抗体１２のシート抵抗値を５００、７００、及び、９００Ω／□にした以外は実施例２と同条件にて座標入力パネル１１を作成した。
（実施例２２、２３、及び、２４）
面抵抗体１２のシート抵抗値を５００、７００、及び、９００Ω／□にした以外は実施例３と同条件にて座標入力パネル１１を作成した。
（実施例２５、２６、及び２７）
面抵抗体１２のシート抵抗値を５００、７００、及び、９００Ω／□にした以外は実施例４と同条件にて座標入力パネル１１を作成した。
（実施例２８、２９、及び３０）
面抵抗体１２のシート抵抗値を５００、７００、及び、９００Ω／□にした以外は実施例５と同条件にて座標入力パネル１１を作成した。
（実施例３１、３２及び３３）
面抵抗体１２のシート抵抗値を５００、７００、及び、９００Ω／□にした以外は実施例６と同条件にて座標入力パネル１１を作成した。
（実施例３４、３５、及び、３６）
面抵抗体１２のシート抵抗値を５００、７００、及び、９００Ω／□にした以外は実施例７と同条件にて座標入力パネル１１を作成した。
（実施例３７、３８、及び３９）
面抵抗体１２のシート抵抗値を５００、７００、及び、９００Ω／□にした以外は実施例８と同条件にて座標入力パネル１１を作成した。
（実施例４０、４１、及び、４２）
面抵抗体１２のシート抵抗値を５００、７００、及び、９００Ω／□にした以外は実施例９と同条件にて座標入力パネル１１を作成した。
（比較例１）
座標入力パネル１１（図１５）は、次のようにして作成した。ガラス基材として、ソーダガラス（厚さ３ミリ）を略４６９×３７５ｍｍの大きさに切断したものを用い、ガラス基材の表面に、スパッタ法によってＩＴＯ（錫を添加した酸化インジウム）膜を形成して面抵抗体１２とした。
次に、抵抗性周囲電極１３、面抵抗体１２の上に(株)アサヒ化学研究所製銀ペーストｌｓ−５０４（樹脂バインダー）にカーボンを混合したペーストを用いて、スクリー ン印刷により印刷し、１８０℃にて３０分加熱硬化した。その際、抵抗性周囲電極２の４頂点間抵抗値が約１００Ωになるように、パターン 幅・長さが設計されたパターンを用いた。
また、検出電極１４〜１７を、（株）アサヒ化学研究所製銀ペーストＬＳ−５０４（樹脂バインダー）をスクリーン印刷し、加熱硬化させることで形成した。このとき、座標入力領域１８の大きさを略４５０×３５０ｍｍとした。
更に、面抵抗体１２上に、透明絶縁性基材を形成した。透明絶縁性基材を形成するには、面抵抗体１２と抵抗性周囲電極１３上にガラスペーストを印刷し、熱処理して粉末ガラスを溶融させ、焼結させた。最後に、検出電極１４〜１７上に、引き出し線２２〜２５を、ハンダ付けにより接続した。この際、面抵抗体１２のシート抵抗は３００Ω／□となるようにした。
（比較例２、３、及び、４）
面抵抗体１２のシート抵抗は５００、７００、及び、９００Ω／□にした以外は、比較例１と同条件で座標入力パネル１１を作成した。
（比較例５）
４１ａの長さ１ｍｍ、４１ａ同士の間隔を８．５ｍｍにした以外は、実施例１３と同条件でパターンを作成し座標入力パネル１１を作成した。
作成した座標入力パネル１１を、図３に示した構成図のように作成したハードウエアに接続した。ただし、ＣＰＵ３１から出力される座標データを、シリアル通信によってパソコンに取り込むようにした。
この座標入力システムを用いて座標入力パネル１１を評価した（表２）。その結果、実施例１〜４２において抵抗性周囲電極一辺における抵抗値の直線性は良く、特に実施例５、６、９、１２、２０、２１、２４、２９、３０、３３、３８、３９、４２が良かった。トレース結果においても本実施例１〜４２において座標入力領域において全体のトレース線の歪みがなかった。さらに、抵抗性周囲電極近傍の微小な歪みも実施例１〜４２は極微小であったが、なかでも実施例１５はより極微小なであった。
また、面抵抗体の抵抗値が異なるものに本パターンを作成した実施例１６〜４２においても他の実施例と同様な抵抗値の直線性とトレース線の歪みがないことが確認できたことから、面抵抗体の抵抗値に依存しない抵抗性周囲電極パターンを得ることができた。
一方、比較例１〜４においては直線型帯形状であるため抵抗値の直線性は得られるが、面抵抗値が異なるとトレース線に歪みが発生してしまった。また、比較例５は第一の直線状の導電性セグメントの破線は短いためトレース線に歪みが生じてしまった。

(Example 2)
In Example 1, the coordinate input panel 11 was created under the same creation conditions as in Example 1 except that the conductive segment used the pattern of the dimensional conditions in Table 1 (see FIG. 16a).
(Example 3)
Pattern of Resistive Ambient Electrode 13 Using the pattern of FIG. 4b, one piece is connected with the same shape as in FIG. 1a, and the four corners are at least a second stepped conductive segment 41b as shown in FIG. 14b. However, it was directly connected to the detection electrode 17 at a stage close to the first linear conductive segment 41a. Moreover, the coordinate input panel 11 was created on the same creation conditions as Example 1 except the conductive segment using the pattern of the dimension conditions of Table 1 (refer FIG. 16b).
Example 4
In FIG. 1a of Example 3, the coordinate input panel 11 was created under the same creation conditions as in Example 1 except that the opposite sides were symmetrical and the conductive segments used the pattern of the dimension conditions in Table 1 (see FIG. 16b). .
(Example 5)
Pattern of Resistive Ambient Electrode 13 Using the pattern of FIG. 4c, one piece has a line-symmetric shape as shown in FIG. 2a, and the four corners have at least a second step-like conductive segment 41b as shown in FIG. 14c. The detection electrode 17 was directly connected at a stage close to the first linear conductive segment 41a. Moreover, the coordinate input panel 11 was created on the same creation conditions as Example 1 except having used the pattern of the dimension conditions (refer FIG. 16c) of Table 1 for the conductive segment.
(Example 6)
In Example 5, the coordinate input panel 11 was created under the same creation conditions as in Example 1 except that the conductive segment used the pattern of the dimensional conditions in Table 1 (see FIG. 16c).
(Example 7)
Pattern of resistive surrounding electrode 13 Using the pattern of FIG. 5a, one piece is formed in a line-symmetric shape as shown in FIG. 2b, and the four corners have at least a second step-like conductive segment 41b as shown in FIG. 14a. The detection electrode 17 was directly connected at a stage close to the first linear conductive segment 41a. Moreover, the coordinate input panel 11 was created on the same creation conditions as Example 1 except having used the pattern of the dimension conditions (refer FIG. 17a) of Table 1 for an electroconductive segment.
(Example 8)
Pattern of resistive surrounding electrode 13 Using the pattern shown in FIG. 5b, one piece has the same shape as in FIG. 1b, the opposite sides are symmetrical, and the four corners are at least a second step shape as shown in FIG. 14b. The conductive segment 41b was directly connected to the detection electrode 17 at a stage close to the first linear conductive segment 41a. Moreover, the coordinate input panel 11 was created on the same creation conditions as Example 1 except having used the pattern of the dimension conditions (refer FIG. 17 b) of Table 1 for an electroconductive segment.
Example 9
The pattern of the resistive surrounding electrode 13 The pattern shown in FIG. 5c is used, one piece is formed in a line symmetrical shape as shown in FIG. 2b, and the four corners are formed with at least a second step-like conductive segment 41b as shown in FIG. 14c. The detection electrode 17 was directly connected at a stage close to the first linear conductive segment 41a. Moreover, the coordinate input panel 11 was created on the same creation conditions as Example 1 except the conductive segment using the pattern of the dimension conditions of Table 1 (refer FIG. 17c).
(Example 10)
In Example 1, the pattern of the second stepped segment closest to the first linear conductive segment 41a was changed as shown in FIG. Moreover, the coordinate input panel 11 was created on the same creation conditions as Example 1 except the conductive segment using the pattern of the dimension conditions of Table 1 (refer FIG. 16a).
(Example 11)
In Example 4, as shown in FIG. 8, the pattern of the second stepped segment closest to the first linear conductive segment 41a was changed. Moreover, the conductive segment produced the coordinate input panel 11 on the same creation conditions as Example 1 except that the conductive segment used the pattern of the dimensional conditions of Table 1 (refer FIG. 16b).
(Example 12)
In Example 5, the pattern of the second stepped segment closest to the first linear conductive segment 41a was changed as shown in FIG. Moreover, the conductive segment produced the coordinate input panel 11 on the same creation conditions as Example 1 except that the conductive segment used the pattern of the dimension conditions of Table 1 (refer FIG. 16c).
(Examples 13, 14, and 15)
In Example 1, it was set as the pattern which changed broken line length A (51), broken line length B (52), and broken line space | interval (53). Moreover, the coordinate input panel 11 was created on the same creation conditions as Example 1 except the conductive segment using the pattern of the dimension conditions of Table 1 (refer FIG. 16a).
(Examples 16, 17, and 18)
The coordinate input panel 11 was created under the same conditions as in Example 1 except that the sheet resistance value of the surface resistor 12 was 500, 700, and 900Ω / □.
(Examples 19, 20, and 21)
The coordinate input panel 11 was created under the same conditions as in Example 2 except that the sheet resistance value of the surface resistor 12 was set to 500, 700, and 900Ω / □.
(Examples 22, 23, and 24)
A coordinate input panel 11 was created under the same conditions as in Example 3 except that the sheet resistance value of the surface resistor 12 was set to 500, 700, and 900Ω / □.
(Examples 25, 26, and 27)
The coordinate input panel 11 was created under the same conditions as in Example 4 except that the sheet resistance value of the surface resistor 12 was 500, 700, and 900Ω / □.
(Examples 28, 29, and 30)
A coordinate input panel 11 was created under the same conditions as in Example 5 except that the sheet resistance value of the surface resistor 12 was set to 500, 700, and 900Ω / □.
(Examples 31, 32 and 33)
A coordinate input panel 11 was created under the same conditions as in Example 6 except that the sheet resistance value of the surface resistor 12 was set to 500, 700, and 900Ω / □.
(Examples 34, 35, and 36)
A coordinate input panel 11 was created under the same conditions as in Example 7 except that the sheet resistance value of the surface resistor 12 was set to 500, 700, and 900Ω / □.
(Examples 37, 38, and 39)
A coordinate input panel 11 was created under the same conditions as in Example 8 except that the sheet resistance value of the surface resistor 12 was set to 500, 700, and 900Ω / □.
(Examples 40, 41, and 42)
A coordinate input panel 11 was created under the same conditions as in Example 9 except that the sheet resistance value of the surface resistor 12 was 500, 700, and 900Ω / □.
(Comparative Example 1)
The coordinate input panel 11 (FIG. 15) was created as follows. As a glass substrate, soda glass (thickness 3 mm) cut to a size of about 469 x 375 mm is used, and an ITO (indium oxide added tin) film is formed on the surface of the glass substrate by sputtering. Thus, a surface resistor 12 was obtained.
Next, printing is performed on the resistive surrounding electrode 13 and the surface resistor 12 by screen printing using a paste obtained by mixing carbon in silver paste ls-504 (resin binder) manufactured by Asahi Chemical Laboratory, Heat curing was performed at 180 ° C. for 30 minutes. At that time, a pattern in which the pattern width and length were designed so that the resistance value between the four apexes of the resistive surrounding electrode 2 was about 100Ω was used.
Moreover, the detection electrodes 14-17 were formed by screen-printing and heat-curing silver paste LS-504 (resin binder) made by Asahi Chemical Laboratory. At this time, the size of the coordinate input area 18 was set to about 450 × 350 mm.
Further, a transparent insulating base material was formed on the surface resistor 12. In order to form a transparent insulating substrate, a glass paste was printed on the surface resistor 12 and the resistive surrounding electrode 13, heat treated to melt the powdered glass, and sintered. Finally, the lead wires 22 to 25 were connected to the detection electrodes 14 to 17 by soldering. At this time, the sheet resistance of the surface resistor 12 was set to 300Ω / □.
(Comparative Examples 2, 3, and 4)
A coordinate input panel 11 was prepared under the same conditions as in Comparative Example 1 except that the sheet resistance of the surface resistor 12 was 500, 700, and 900Ω / □.
(Comparative Example 5)
A coordinate input panel 11 was created by creating a pattern under the same conditions as in Example 13 except that the length of 41a was 1 mm and the interval between 41a was 8.5 mm.
The created coordinate input panel 11 was connected to the created hardware as shown in the block diagram of FIG. However, coordinate data output from the CPU 31 is taken into a personal computer by serial communication.
The coordinate input panel 11 was evaluated using this coordinate input system (Table 2). As a result, the linearity of the resistance value on one side of the resistive surrounding electrode in Examples 1-42 is good, and in particular, Examples 5, 6, 9, 12, 20, 21, 24, 29, 30, 33, 38, 39, 42 was good. Also in the trace results, in Examples 1-42, there was no distortion of the entire trace line in the coordinate input area. Furthermore, the minute distortion in the vicinity of the resistive surrounding electrode was extremely small in Examples 1 to 42, and in particular, Example 15 was extremely small.
Also, in Examples 16 to 42 in which this pattern was created with different resistance values of the surface resistor, it was confirmed that there was no resistance linearity and trace line distortion similar to other examples. Thus, it was possible to obtain a resistive surrounding electrode pattern independent of the resistance value of the surface resistor.
On the other hand, in Comparative Examples 1 to 4, since the linear belt shape is used, the resistance value linearity can be obtained. However, if the surface resistance values are different, the trace lines are distorted. Further, in Comparative Example 5, since the broken line of the first linear conductive segment is short, the trace line is distorted.

DESCRIPTION OF SYMBOLS 1 Coordinate input panel 2 Surface resistor 3 Resistive surrounding electrode 4, 5, 6, 7 Detection electrode 8 Coordinate input area 11 Coordinate input panel 12 Surface resistor 13 Resistive surrounding electrode 14, 15, 16, 17 Detection electrode 18 Coordinate Input area 21 Fingers 22, 23, 24, 25 Lead-out line 26 Analog signal processing unit 27 Vibration voltage applying circuit 28 Vibration voltage generator 29 Analog multiplexer 30 A / D converter 31 CPU
41a, 41b, 41c Conductive segments 42a, 42b, 42c Equivalent resistances 43a, 43b, 43c Gap 45 between adjacent conductive segments arranged in parallel 45 Equipotential line 46 Resistance value abnormal portion 47a of resistive surrounding electrode 13 47b, 47c, 47d, 47e, 47f Equivalent resistance 50 Dashed line width 51 in the first linear conductive segment 51 Dashed line length A in the first linear conductive segment
52 Broken line length B in first linear conductive segment
53 Distance between broken lines 54 in the first linear conductive segment Step width 55 in the second step-shaped conductive segment Step gap 56 in the second step-shaped conductive segment Second step-shaped conductive segment The overlap length of the staircase at 57 The gap of one step of the staircase in the second step-like conductive segment

Claims (5)

It consists of a surface resistor and at least three or more substantially linear resistive surrounding electrodes formed on the surface resistor, and the ends of the resistive surrounding electrodes are electrically connected to each other by a detection electrode. A coordinate input panel having the detection electrode as a corner vertex and a portion surrounded by the at least three or more resistive surrounding electrodes as a coordinate input region, and arranged inward with respect to the surface resistor. In one conductive segment, linear conductive segments of the same length are alternately arranged in a broken line, and the second conductive segment is in contact with the surface resistor of the first linear conductive segment. The conductive segments having at least two steps or more provided on the outside and having at least two steps or more are adjacent to each other. And placed in parallel The different steps of the adjacent staircase-shaped conductive segments have at least one place adjacent to each other, and one at the center of the innermost step of the second staircase-shaped conductive segment. The first linear conductive segments are adjacent to each other, and each first linear conductive segment located on both sides of the linear conductive segment is the second step-shaped conductive segment. The innermost step and the innermost step of the second step-shaped conductive segment located on both sides of the step-shaped conductive segment are disposed adjacent to each other, and at least 2 The conductive segments having a staircase shape, which is the second conductive segment of the step or more, are arranged so that the conductive segments having the staircase shapes are adjacent to each other in parallel and adjacent to each other. Of different stages between the conductive segments, the coordinate input panel, wherein a portion adjacent proximate provided resistance around electrode pattern having at least one or more places. It consists of a surface resistor and at least three or more substantially linear resistive surrounding electrodes formed on the surface resistor, and the ends of the resistive surrounding electrodes are electrically connected to each other by a detection electrode. A coordinate input panel having the detection electrode as a corner vertex and a portion surrounded by the at least three or more resistive surrounding electrodes as a coordinate input region, and arranged inward with respect to the surface resistor. In one conductive segment, first linear conductive segments having the same length are arranged in a broken line, and the second conductive segment is a sheet resistor of the first linear conductive segment. On the other hand, the conductive segments having at least two steps or more provided on the outside and having at least two steps or more are connected to each other. Close and parallel The different steps of the adjacent staircase-shaped conductive segments have at least one location adjacent to each other, and the first linear conductive segment has the second staircase-shaped conductivity. The innermost step of the conductive segment and the innermost step of the step-shaped conductive segment located on both sides of the step-shaped conductive segment, and are arranged close to each other, and at least 2 The conductive segments having the second staircase shape of the step or more are arranged in such a manner that the conductive segments having the respective staircase shapes are adjacent to and parallel to each other, and the different steps of the adjacent staircase-shaped conductive segments are mutually different. A coordinate input panel comprising a resistive peripheral electrode having a pattern having at least one location adjacent to each other. The second step-like segment provided outside the first linear conductive segment includes at least two conductive segments arranged side by side, and among the surface resistors, the broken line shape At least two steps constituting a resistive surrounding electrode that is provided so as to surround the surface resistor, the region being surrounded by the first linear conductive segment and the stepwise conductive segment arranged side by side The pattern of the conductive segments having the above-mentioned staircase shape is line symmetric at the center of each resistive surrounding electrode, and the conductive segments having the respective staircase shapes are arranged close to each other in parallel and adjacent to each other. 3. A resistive peripheral electrode having a pattern in which at least two adjacent portions adjacent to each other in the shape of the conductive segments having a shape are provided. Coordinate input panel. The end of the resistive surrounding electrode electrically connected to the detection electrode has the first linear conductive segment having a gap with the detection electrode, and at least the first linear 4. The coordinate input panel according to claim 1, wherein an end portion of the second step-like conductive segment closest to the conductive segment is directly connected to the detection electrode. The surface resistor and the at least four or more substantially resistive surrounding electrodes formed on the surface resistor, and the pattern of the second step-shaped conductive segment is the first resistor The resistive surrounding electrode having a pattern in which the interval between the first step adjacent to the linear conductive segment and the second step is wider than the interval between the second step and the third step is provided. The coordinate input panel according to claim 1, wherein:

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