JP2006012110A - Capacitance type coordinate detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacitance type coordinate detector constituted so that coordinate detection is performed with high accuracy even when bypasses are formed in an electrode pattern. <P>SOLUTION: The capacitance type coordinate detector is set so that total synthetic capacity C (= CR + CL) is maintained constant by making synthetic capacity CL between a common electrode 1k and an X detection electrode 1x large by setting length dimension of parallel electrodes 23a, 23b of the X detection electrode 1x large while synthetic capacity CR between the common electrode 1k and an X detection electrode 2x having a plurality of bypasses 26 is small. Thus, detection of a coordinate positions with high accuracy becomes possible even when the bypasses 26 are formed in the electrode pattern. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a coordinate detection device mounted on an information terminal device such as a mobile phone or a PDA, and more particularly, a plurality of X electrodes and Y electrodes arranged on the front and back surfaces of a base sheet so as to cross each other. The present invention relates to a capacitance type coordinate detection apparatus.

As a prior art related to the present invention, there is Patent Document 1 as shown below, for example.
In Patent Document 1, a switch element 11 provided with a reversing plate 10 is provided on the lower side, and a capacitance type coordinate detection device (a flat plate input device 4) is provided on the upper side. The switch element 11 includes a central electrode 13a1 and a ring-shaped electrode 13a2 provided on the periphery thereof on a resin sheet 12, and a metal diaphragm type on the surface of the ring-shaped electrode 13a2. A reversing plate 15 is provided. On the other hand, the flat type input device 4 has a flexible resin sheet in which an X-direction detection electrode and a Y-direction detection electrode are opposed to each other in a matrix on both upper and lower surfaces. On the surface of the resin sheet, a display sheet 7 on which characters, symbols or figures are printed is laminated.

  When the finger touched by the display sheet 7 is pushed in strongly, the reversing plate 15 is reversed, and the center electrode 13a1 and the ring-shaped electrode 13a2 are made conductive so that input as a switch can be performed. Yes. In addition, when the switch is operated, the reversing plate 15 is reversed, so that a click feeling can be given to the operator.

  In the above device, when a finger or the like that is lightly touching the surface of the display sheet 7 is moved to draw a character, the flat-plate input device 4 causes the finger to change due to a change in capacitance between the X electrode and the Y electrode. Can be detected as position data for each time on the XY coordinate axes, so that the character can be input.

As such a capacitance-type coordinate detection device, there is a prior art such as Patent Document 2 below.
JP 2002-123363 A Japanese Patent Laid-Open No. 08-137607

  In the information terminal type apparatus as described above, it is necessary to allow the operator to recognize the position of the switch (position of characters, etc.) even in the dark. For this purpose, for example, a light source such as an LED for brightly displaying characters, symbols or figures printed on the surface of the switch button is preferably provided in the apparatus, and the back surface of the display sheet 7 is illuminated from within the apparatus.

  However, the flat plate type input device 4 is provided between the light source and the display sheet 7, and a large number of X electrodes and Y direction electrodes provided on the flat plate type input device 4 are emitted from the light source. Therefore, there is a problem that the display sheet 7 tends to be dark.

  In this regard, for example, if the X electrode and the Y electrode are formed of a transparent electrode (ITO), the light emitted from the light source can pass through the ITO and display the characters etc. brightly, thus solving the above-mentioned problems. However, since the ITO is expensive, there is a problem that the manufacturing cost is likely to increase.

  Further, if a hole through which the light from the light source passes directly can be formed in the flat input device 4, the back surface of the display sheet 7 can be illuminated brightly.

  However, when a hole is formed in the flat type input device 4, the X electrode and the Y electrode must be arranged so as to bypass the position of the hole. In this case, depending on the formation position of the hole, a line having a detour (X, Y electrode) and a line not having it (X, Y electrode) may be mixed, and the capacitance is greatly different between the lines. Therefore, there arises a problem that the coordinate position cannot be detected correctly.

Moreover, in the electrostatic capacitance type coordinate detection apparatus disclosed in Patent Document 2, when one electrode is grounded (−electrode) among the plurality of X electrodes and Y electrodes, a voltage on the + side is applied to the other electrode. The X electrode and the Y electrode become a negative electrode or a positive electrode depending on the situation at that time. A wiring pattern composed of a plurality of lead lines for connecting to other circuits is formed on the X electrode and the Y electrode. With the recent miniaturization of portable terminal devices, the X electrode disposed on the outside is particularly preferred. It has to be arranged in a state of being concentrated near the electrode or Y electrode.

  However, when wiring patterns are densely arranged near the outer X electrode and Y electrode, the capacitance with respect to the outer X electrode and Y electrode becomes unstable, and it is difficult to detect the coordinate position correctly. Arise.

  The present invention is for solving the above-described conventional problems, and is a case where a detour for avoiding a hole or the like on the substrate must be formed in the X electrode and the Y electrode for detecting the coordinate position. Another object of the present invention is to provide a capacitance type coordinate detection apparatus that can correctly detect the coordinate position.

  It is another object of the present invention to provide a capacitance type coordinate detection device that can correctly detect a coordinate position even when lead wires are densely arranged near the outer X electrode or Y electrode. It is aimed.

According to the present invention, a plurality of detection electrodes that extend in the Y direction and are spaced from each other in the X direction and are each given a voltage to the base sheet are positioned between the adjacent detection electrodes and the Y direction. And a plurality of common electrodes extending to
When a contact body, which is a conductor, contacts or approaches the base sheet, a change in capacitance between each of the detection electrodes and the common electrode opposed thereto is detected, and the contact body contacts or approaches In the electrostatic capacitance type coordinate detection apparatus in which the position on the XY coordinate plane is detected,
Any one of the common electrodes is used as a reference common electrode, the first detection electrode adjacent to one side of the reference common electrode among the detection electrodes, and the second detection electrode adjacent to the other side. When
In a specific place, at least one of the reference common electrode and the first detection electrode and the reference common electrode and the second detection electrode is formed with a detour approaching the other For example, a hole is formed in the base material sheet, and the bypass is formed on the side of the hole.

  In addition, an operation member is provided on one side of the base sheet, and an electronic component operated by the operation member is provided on the other side, and a part of the operation member passes through the hole to dispose the electronic component. Configured to be operable.

  Or the light source for illumination is arrange | positioned in the hole of the said base material sheet, or the said hole is comprised as what is used as the path | route of the light emitted from the said light source.

In the above, when the capacitance between the reference common electrode and the first detection electrode is CR, and the capacitance between the reference common electrode and the second detection electrode is CL,
It is preferable that the pattern of each electrode is set so that the combined capacitance of the capacitance CR and the capacitance CL is maintained constant by complementing the increase / decrease in the capacitance of the other capacitance.

For example, a common branch electrode is formed on the reference common electrode with an interval in the Y direction and extending on both sides in the X direction, and the first detection electrode extends in the X direction and faces the common branch electrode. The first auxiliary electrode is formed on the second detection electrode, and a second auxiliary electrode extending in the X direction and facing the common branch electrode is formed on the second detection electrode,
The common branch electrode and the first auxiliary electrode are provided in the detour or in the vicinity of the detour, and the common branch electrode and the second auxiliary electrode are provided in the detour or in the vicinity of the detour. Can be configured as not facing each other.

Alternatively, the reference common electrode is formed with a common branch electrode extending in both sides of the X direction with an interval in the Y direction, and the first detection electrode extends in the X direction and faces the common branch electrode. The first auxiliary electrode is formed on the second detection electrode, and a second auxiliary electrode extending in the X direction and facing the common branch electrode is formed on the second detection electrode,
In the vicinity of the detour or in the vicinity of the detour, the opposing length dimension of the common branch electrode and the first auxiliary electrode is longer than the opposing length dimension of the common branch electrode and the second auxiliary electrode. What is formed is preferable.

  In addition, it can also be set as the Y direction instead of the said X direction, and the X direction instead of the said Y direction.

  The above-described description and the above-described description are provided, and both the coordinate position in the X direction and the coordinate position in the Y direction of the contact portion of the contact body can be input.

Further, the present invention provides a base sheet in which a plurality of holes are formed, and a plurality of sheets that are arranged on one surface of the base sheet in the Y direction and arranged at predetermined intervals in the X direction, and are each supplied with a voltage. X detection electrode, a plurality of Y detection electrodes that extend in the X direction on the other surface of the base sheet and are arranged at predetermined intervals in the Y direction, and are each given a voltage, and any one surface A plurality of common electrodes facing both the adjacent X detection electrode and the adjacent Y detection electrode, between the X detection electrode and the common electrode, and between the Y detection electrode and the common electrode In an electrostatic capacitance type coordinate detection apparatus having control means for applying the voltage at a predetermined timing, and a plurality of lead lines connecting between the individual X detection electrodes and the Y detection electrodes and the control means,
The lead wires are concentrated in the vicinity of the outer side of the X detection electrode or the Y detection electrode located at either end, and the hole is arranged opposite to the inner side of the X or Y detection electrode. And
One of the X detection electrode or the Y detection electrode and the common electrode opposed to each other with the base material sheet interposed therebetween is arranged so that the X detection electrode or the Y detection electrode and the common electrode face each other, thereby causing the X detection electrode or the Y detection. A first adjustment electrode for adjusting the capacitance between the electrode and the common electrode is formed.

In the above invention, the Y detection electrode provided on the outer side or the common electrode that forms a capacitance with the outer detection electrode by densely arranging the lead wires near the X detection or forming a hole Even if it is not possible to place the two in the opposite position, the shortage of the electrostatic capacity can be supplemented, so that the coordinate position can be detected correctly.

  Further, one of the X detection electrode or the Y detection electrode and the common electrode opposed to each other with the base sheet interposed therebetween is opposed to the first adjustment electrode at a position that does not overlap with the base sheet. It is preferable that the second adjustment electrode is formed.

With the above means, the shortage of capacitance can be further supplemented.
The common electrode may be configured to be provided with a common counter electrode that faces both of the pair of adjacent X detection electrodes and the pair of adjacent Y detection electrodes and extends around the hole.

  The capacitance-type coordinate detection device of the present invention can freely make a hole in a base material sheet constituting the coordinate detection device. For this reason, it becomes possible to use the key which has a stem, and since the said stem can operate a diaphragm, a comfortable click feeling can be given to an operator.

In addition, since light from the light source can be easily guided to the back of the key, brighter illumination is possible.
Furthermore, by forming the electrode pattern so as to complement the increase and decrease of the capacitance between the electrodes, it is possible to detect a coordinate position with high accuracy even if a detour is formed on the base sheet.

  Also, the Y detection electrode provided on the outside or the lead electrode is densely arranged near the X detection, or a common electrode that forms a capacitance with the outside detection electrode is formed oppositely by forming a hole. Even if the capacitance cannot be achieved, the shortage can be supplemented by the constituent teaching, so that the coordinate position can be correctly detected.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view showing a mobile phone as an information terminal device on which the coordinate detection device of the present invention is mounted, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a first embodiment of the present invention. FIG. 4 is a plan view showing an X detection electrode and a common electrode formed on one surface of the substrate sheet of FIG. 3, and FIG. It is a top view at the time of seeing the common electrode formed in one surface of a base material sheet, and the Y detection electrode formed in the other surface from the same direction as FIG. 3 to 5, only the insertion hole 21a for allowing the stem 12b to pass is shown, and the passage hole 21b for allowing light to pass is omitted.

  FIG. 1 mainly shows an operation unit 11 of a mobile phone 10 as an information terminal device. As shown in FIG. 1, the operation unit 11 has a plurality of operation keys (operation members) 12 having a general key arrangement. As shown in FIG. 2, the operation unit 11 includes an upper case 11A and a lower case 11B that are integrally combined. A plurality of opening holes 11a, 11a,... Are formed in the upper case 11A, and the key top 12a, which is the surface of the operation key 12, is exposed to the outside from these opening holes 11a, 11a,. ing. Characters, symbols or figures are printed on the key top 12a.

The operation keys 12 are made of a transparent or translucent synthetic resin. For example, the operation keys 12 are formed as a key mat in which the operation keys 12 are integrally connected via a hoop portion (not shown). Therefore, each operation key 12 is connected to the key mat on the main body side through the hoop portion so as to be elastically deformable in the Z1-Z2 direction shown in the drawing. A column-shaped stem (pressing convex portion) 12b is integrally formed on the back surface (surface on the Z2 side) of each operation key 12, and extends in the device internal direction (Z2 direction).

  A circuit board 13 is fixed to the lower case 11B, and a plurality of electronic components 15 and a light source 14 are provided on the circuit board 13. The operation key 12 is arranged so that the tip of the stem 12b faces each electronic component 15.

  The electronic component 15 includes a metal reversal plate having a dome shape and a contact electrode, for example. A base end portion of the reversing plate is fixed to a ring-shaped electrode provided on the circuit board 13, and an inner surface of the reversing plate is opposed to the contact electrode. The reversing plate is reversed, and the inner surface of the reversing plate is in contact with the contact electrode, whereby the contact electrode and the ring electrode are electrically connected. The light source 14 is composed of an LED or the like, and is provided around the electronic component 15.

  As shown in FIG. 2, a coordinate detection device 20 is provided inside the operation unit 11, and the coordinate detection device 20 is fixed to the lower surface of the key mat via an adhesive 16.

  The coordinate detection device 20 has a film-like base material sheet 21 excellent in flexibility. The substrate sheet 21 is preferably formed of a dielectric. As shown in FIG. 4, on one surface of the base sheet 21, a plurality of X detection electrodes 1x, 2x, 3x, 4x, 5x, which extend in the Y direction and are arranged at predetermined intervals in the X direction. 6x and a plurality of common electrodes 1k, 2k, 3k, 4k, and 5k that extend in the Y direction and have a predetermined interval in the X direction and that are arranged between the individual X detection electrodes do not contact each other. Wired to The common electrodes 1k, 2k, 3k, 4k, and 5k are connected to each other at the end on the Y2 side, and are drawn out to the outside of the base sheet 21 as the common electrode K.

  Further, as shown by a dotted line in FIG. 5, a plurality of Y detection electrodes 1 y, 2 y, 3 y, and 4 y that extend in the X direction and are arranged at predetermined intervals in the Y direction on the other surface of the base sheet 21. , 5y, 6y, 7y, 8y. In FIG. 5, the common electrodes 1k, 2k, 3k, 4k, and 5k provided on one surface of the base sheet 21 are indicated by solid lines.

  A plurality of X detection electrodes 1x, 2x, 3x, 4x, 5x, 6x provided on one side of the base sheet 21, and a plurality of Y detection electrodes 1y, 2y, 3y, 4y, 5y, 6y provided on the other side 7y and 8y are arranged so as to vertically intersect each other on both surfaces of the base material sheet 21.

  As shown in FIGS. 4 and 5, the common electrodes 1k, 2k, 3k, 4k, and 5k are formed with a plurality of common branch electrodes 22 that extend linearly with a predetermined length toward both sides in the X direction. ing. The individual common branch electrodes 22 are provided so as to intersect the common electrodes 1k, 2k, 3k, 4k, and 5k with a certain interval in the Y direction, and the tips in the both side (X1 and X2) directions are Basically, it extends to a position just before the X detection electrodes 1x, 2x, 3x, 4x, 5x, 6x.

As shown in FIG. 4, each X detection electrode 1x, 2x, 3x, 4x, 5x, 6x is formed with a plurality of first auxiliary electrodes 23 extending in parallel on both sides in the X direction. The first auxiliary electrode 23 is basically formed of a pair of parallel electrodes 23a, 23b, and is spaced apart in the Y direction and has the X detection electrodes 1x, 2x, 3x, 4x, 5x, 6x. It is arranged to intersect. The tip of the common branch electrode 22 is inserted between one parallel electrode 23a and the other parallel electrode 23b forming the first auxiliary electrode 23, and the tip of the common branch electrode 22 is It arrange | positions so that it may oppose partially with respect to the parallel electrodes 23a and 23b.

  In addition, as shown in FIG. 5, the second auxiliary electrodes 24 extending in parallel to both sides in the Y direction are formed on the individual Y detection electrodes 1y, 2y, 3y, 4y, 5y, 6y, 7y, and 8y. The second auxiliary electrode 24 is also basically formed of a pair of parallel electrodes 24a, 24b, and the Y detection electrodes 1y, 2y, 3y, 4y, 5y, 6y are spaced apart in the X direction. , 7y, 8y. As shown in FIG. 5, the common electrodes 1k, 2k, 3k, 4k, and 5k provided on the other surface of the base sheet 21 are provided on the other surface of the base sheet 21 and the second surface. The auxiliary electrode 24 is disposed so as to pass between one parallel electrode 24a and the other parallel electrode 24b.

  The coordinate detection device 20 has a surface sheet (not shown) covering the X detection electrode and the common electrode on one surface of the base sheet 21 on which the X detection electrode and the common electrode shown in FIG. 4 are wired. A back sheet (not shown) that covers the Y detection electrode is also stacked on the other surface of the base sheet 21 on which the Y detection electrode shown in FIG. 5 is wired.

  In addition, when the said base material sheet 21 is formed with the dielectric material, it is preferable that the said surface sheet and a back surface sheet are transparent insulating sheets. Further, when the base sheet 21 is not formed of a dielectric, the top sheet and the back sheet are preferably transparent sheets having dielectric properties.

  As shown in FIG. 2, the base sheet 21 (the same applies to the top sheet and the back sheet) has an insertion hole 21 a for allowing the stem 12 b to pass therethrough and light emitted from the light source 14 on the back of the operation key 12. A passage hole 21b that functions as a guide passage is formed. Therefore, when the operation key 12 is pressed, the stem 12b can invert the reversing plate of the electronic component 15, so that a comfortable click feeling can be given to the operator.

  Further, since the light emitted from the light source 14 can pass through the passage hole 21b as a passage, the back surface of the key (operation member) 12 can be illuminated brightly. In this case, when the light source 14 for illumination is disposed so as to face the passage hole 21b formed in the base sheet 21, the character, symbol or figure printed on the key top 12a is clearly displayed even in the dark. It can be recognized.

The operation of the coordinate detection apparatus will be described below.
First, coordinate detection when only the common electrode K, the common branch electrode 22, the X detection electrode, and the Y detection electrode are provided, that is, when the first auxiliary electrode 23 and the second auxiliary electrode 24 are not provided. The operation of the apparatus will be described.

  FIG. 6 is an enlarged plan view showing a reference common electrode and two X detection electrodes adjacent thereto, and FIG. 7 is an X detection electrode adjacent to a common branch electrode provided on the reference common electrode. It is a top view which expands and shows the relationship with the obtained parallel electrode.

  As shown in FIG. 6, when any one of the plurality of common electrodes 1k, 2k, 3k, 4k, 5k, for example, the common electrode 3k is a reference common electrode, one side adjacent to the reference common electrode 3k. The X detection electrode located on (for example, the right side) is 4x, and the X detection electrode located on the other (left side) is 3x.

The reference common electrode 3k and the X detection electrode 3x are coupled by a capacitance C1, and the reference common electrode 3k and the X detection electrode 4x are coupled by a capacitance C2. For this reason, when a pulsed voltage Vin is applied to the reference common electrode 3k using an oscillation means (not shown), the voltage Vin is applied to the X detection electrode 3x through the capacitance C1, and the X detection is also performed. The voltage Vin is applied to the electrode 4x through the capacitance C2.

  The inter-electrode distance d between the reference common electrode 3k and the X detection electrode 3x and the opposing length between the electrodes are such that the inter-electrode distance d between the reference common electrode 3k and the X detection electrode 4x and the distance between the electrodes. When the opposing length dimensions are equal, both capacitances are C1 = C2, and the balance between the two electrodes is adjusted.

  From this state, when a contact body such as a finger in contact with or close to the surface sheet covering the reference common electrode 3k is brought into contact or close to the surface, the reference common electrode 3k and the X detection electrodes 3x and 4x are connected. Since a part of the dielectric flux generated in the above is pulled out to the contact body side, the capacitances C1 and C2 are reduced. For this reason, the X detection electrodes 3x and 4x output the detection voltage Vout corresponding to the changes in the capacitances C1 and C2. The detection voltage Vout is output as a smaller voltage value as the distance between the contact body and the X detection electrode is shorter. That is, the voltage value output from the X detection electrodes 3x and 4x is the smallest, and the voltage values output from the other X detection electrodes 1x, 2x, and 5x remain large. For this reason, it is possible to determine the coordinate position of the contact body in the X direction by sequentially detecting the voltage values of the X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x at a constant period. .

  On the other hand, in the case shown in FIGS. 3 to 5, the common electrodes 1k, 2k, 3k, 4k, and 5k are formed with a plurality of common branch electrodes 22 extending in the X direction at a predetermined pitch in the Y direction. Yes. That is, a total of seven sets of one set of common branch electrodes 22 arranged in a row in the X direction are formed. Seven sets of common branch electrodes 22 arranged at a predetermined pitch in the Y direction and the Y detection electrodes 1y, 2y, 3y, 4y, 5y, 6y, 7y, and 8y provided therebetween are opposed to each other.

Assuming that one of the seven sets of common branch electrodes 22 is a reference common electrode, electrostatic capacitances C1 and C2 similar to the above are also present between the reference common electrode and two Y detection electrodes adjacent in the Y direction. Each is formed. Therefore, as in the case of the X detection electrode, a pulse voltage Vin having a predetermined cycle is applied to the common electrode K side, and the detection voltage output from the Y detection electrodes 1y, 2y, 3y, 4y, 5y, 6y, 7y, and 8y. By sequentially detecting Vout at a predetermined cycle, it is possible to determine the coordinate position of the contact body in the Y direction.

  The coordinate detection device 20 can input the coordinate information of the contact body to the mobile phone 10 by acquiring the coordinate position in the X direction and the coordinate position in the Y direction.

  However, as shown in FIG. 2, the base sheet 21 (the front sheet and the back sheet are the same) has an insertion hole 21 a for allowing the stem 12 b to pass therethrough and light emitted from the light source 14. A passage hole 21b that functions as a passage leading to the back surface is formed. For this reason, the common electrode, the common branch electrode 22, the X detection electrode, and the Y detection electrode cannot be formed linearly on the base sheet 21, and the detour 26 that avoids the insertion hole 21a is partially Is formed.

However, when a partial detour is formed in the common electrodes 1k, 2k, 3k, 4k, 5k, the common branch electrode 22, the X detection electrode, and the Y detection electrode, the common electrodes 1k, 2k, 3k, 4k, 5k, Adjacent to each of the individual electrostatic capacitances between the X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x adjacent thereto and seven sets of common branch electrodes 22 arranged at a predetermined pitch in the Y direction. The individual capacitances between the Y detection electrodes 1y, 2y, 3y, 4y, 5y, 6y, 7y, and 8y are formed in different sizes due to the difference in distance between the electrodes. That is, since the capacitances C1 and C2 formed between the reference common electrode and the X detection electrode (or Y detection electrode) adjacent thereto are not constant, the X detection electrode or Y detection The X and Y coordinates of the contact body cannot be detected correctly from the voltage value detected from the electrode.

  Therefore, in the present invention, as described above, a plurality of first auxiliary electrodes 23 are formed on the X detection electrodes 1x, 2x, 3x, 4x, 5x, 6x, and the Y detection electrodes 1y, 2y, 3y, 4y, This is dealt with by forming a plurality of second auxiliary electrodes 24 in 5y, 6y, 7y, and 8y, and the operation will be described below.

  As shown in FIG. 7, any one of the plurality of common electrodes 1k, 2k, 3k, 4k, and 5k is set as a reference common electrode BK, and one side (for example, the right side) adjacent to the reference common electrode BK is used. The X detection electrode positioned is the first detection electrode XR, and the X detection electrode positioned on the other (left side) is the second detection electrode XL. The first detection electrode XR and the second detection electrode XL are any two adjacent ones of the X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x.

  Further, the tip of the common branch electrode 22 extending in the X1 direction from the reference common electrode BK is disposed oppositely between a pair of parallel electrodes (first auxiliary electrodes) 23a and 23b extending in the X2 direction from the first detection electrode XR. The tip of the common branch electrode 22 extending in the X2 direction from the reference common electrode BK is a pair of parallel electrodes (second electrodes) extending in the X1 direction from the second detection electrode XL. The auxiliary electrode) 23a and 23b are located opposite to each other as a second capacitance adjusting unit 25B.

The length dimension (opposite length dimension) of the first and second auxiliary electrodes where the parallel electrodes 23a and 23b and the common branch electrode 22 face each other is L, and the parallel electrodes 23a and 23b and the common branch electrode 22 the inter-electrode distance d, and the dielectric constant of the base sheet 21 epsilon, the Z direction thickness dimension of each electrode [delta] (not shown), the capacitance C _a of the first capacitance adjustment section 25A is The following equation 1 is obtained.

Similarly, the capacitance C _B in the second capacitance adjustment unit 25B can be expressed by the following formula 2.

Since the dielectric constant ε and the film thickness dimension δ of each electrode can be regarded as constant values, as a result, the capacitances C _A and C _B are both proportional to the opposing length dimension L between the electrodes.

Such first and second capacitance adjusting sections 25A and 25B are provided on the left and right sides of one reference common electrode BK (in the example shown in FIGS. Yes) is provided. In addition, the capacitance existing between the reference common electrode BK and the first detection electrode XR is C1, and the capacitance existing between the reference common electrode BK and the second detection electrode XL is C2. Then,
Between the reference common electrode BK and the first detection electrode XR, the capacitance C1 and the capacitance C _A formed in the first capacitance adjustment unit 25A at the n locations are connected in parallel. Since it is equivalent to existing in the state, the combined capacity CR during this period is CR = C1 + n · C _A. Similarly, between the reference common electrode BK and the second detection electrode XL, the capacitance C _B and parallel connection formed in the second capacitance adjustment portion 25B of the capacitance C2 and the n locations since it is equivalent to present in a state of being, during which the combined capacitance CL is _{CL = C2 + n · C B} .

By the way, when the predetermined voltage Vin is applied to the common electrodes 1k, 2k, 3k, 4k, and 5k, and the detection voltage Vout is acquired from the X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x,
A voltage Vin is applied to one X detection electrode from two common electrodes located on both sides thereof. For example, when a voltage is detected from the X detection electrode 2x, the voltage Vin acts from both the adjacent common electrode 1k and the common electrode 2k on the X detection electrode 2x. The capacitance C1 between the common electrode 1k and the X detection electrode 2x and the capacitance C2 between the common electrode 2k and the X detection electrode 2x are values connected in parallel (C = C1 + C2).

  Therefore, the total combined capacitance C between the reference common electrode BK and the first and second detection electrodes XR and XL is expressed by the following equation (3).

  That is, by forming a plurality of first and second capacitance adjusting sections 25A and 25B, electrostatic coupling between the reference common electrode BK and the first and second detection electrodes XR and XL is enhanced, and the overall By increasing the combined capacitance C, it is possible to increase the variation in capacitance when the contact body approaches or approaches. For this reason, the change of the voltage value detected from each X detection electrode and Y detection electrode can be caught reliably, and it becomes possible to raise the detection accuracy of a coordinate detection apparatus.

In addition, since Formula 3 has a capacitance corresponding to n · (C _A + C _B ), it is possible to widen the adjustment range of the total combined capacitance C. That is, the capacitance corresponding to n · (C _A + C _B ) is formed by the plurality of first and second capacitance adjusting sections 25A and 25B. Therefore, the combined capacitance C formed between the electrodes can be kept constant.

Next, an example of a method for adjusting the composite capacity C will be described.
First, the state shown in FIG. 7, that is, the capacitance C1 between the original reference common electrode BK and the first detection electrode XR, and between the original reference common electrode BK and the second detection electrode XL. And the plurality of first capacitance adjusting sections 25 are the same size (C1 = C2).
If the A capacitance n · _{C A} and a plurality of capacitive n · _{C B} of the second capacitance adjustment portion 25B of the same size _{(n · C A = n ·} C B) (CL (= C1 + n · C _A ) = CR (= C2 + n · C _B )) is set as a reference state in which balance adjustment is maintained. Note that the total combined capacity C in the reference state is the above formula 3.

  Next, referring to FIG. 4, the common electrode 1k is used as a reference common electrode BK, the X detection electrode 2x on the X1 side is used as the first detection electrode XR, and the X detection electrode 1x on the X2 side is used as the second detection electrode XL. The case will be described.

  As shown in FIG. 4, in the middle of the Y direction in which the X detection electrode 2x extends, the operation key 12 on which characters such as “OFF”, “1”, “4”, “7”, “*” are printed. Five insertion holes 21a for inserting the stem 12b are formed at a predetermined pitch. Five bypass paths 26 (indicated by 26a, 26b, 26c, 26d, and 26e, respectively) for forming the X detection electrode 2x are formed on the side of the insertion hole 21a. Each detour 26 is formed in a substantially arc shape so as to avoid the insertion hole 21a, and all the detours 26 project in a convex shape in the X1 direction as viewed from the common electrode 1k which is the reference common electrode BK. It is formed to do. Further, most of the plurality of first capacitance adjusting portions 25A provided adjacent to the respective insertion holes 21a and on the right side of the first detection electrode XR (X detection electrode 2x) have one or both of the parallel electrodes 23a and 23b. It cannot be extended in the X2 direction.

For this reason, between the common electrode 1k that is the reference common electrode BK and the X detection electrode 2x on the X1 side that is the first detection electrode XR, the original capacitance C1 and the plurality of first capacitance adjustment units The capacitance n · C _A formed by 25A is both small, and the combined capacitance CR during this period is smaller than the reference state.

  On the other hand, a common distance is maintained between the common electrode 1k and the X detection electrode 1x between the common electrode 1k as the reference common electrode BK and the X detection electrode 1x on the X1 side as the second detection electrode XL. Therefore, the original capacitance C1 during this period is almost the same as that in the reference state. However, the length dimension of the parallel electrodes 23a and 23b extending in the X1 direction from the X detection electrode 1x is formed longer than the length dimension in the reference state, and between the parallel electrodes 23a and 23b and the common branch electrode 22 is formed. The opposing length dimension L is longer.

In other words, a common electrode 1k is the reference common electrode BK, in between the second detection electrode XL, capacitance n · C _B formed by the plurality of second capacitance adjusting unit 25B is to be larger The combined capacitance CL during this period is in a larger state than the reference state.

  The total combined capacity C = CR + CL is set to match the reference state. That is, the total composite capacity (the reference common electrode BK and the first common capacity BK as a whole) is complemented by the decrease in one composite capacity CR on the right side of the reference common electrode BK with the other composite capacity CL on the left side. 1 and the combined capacitance between the second detection electrodes XR and XL) C are maintained at a constant value.

  Further, in the middle of the Y direction in which the common electrode 3k extends, four insertion holes through which the stem 12b of the operation key 12 printed with the characters “2”, “5”, “8”, “0” are inserted. 21a is formed at a predetermined pitch. In this case as well, by performing the same treatment as described above, the decrease or increase in the composite capacitance CR between the common electrode 3k and one X detection electrode 4x is reduced to the other. By complementing with the total capacitance CL between the X detection electrode 3x, the total total capacitance (the total capacitance between the reference common electrode BK and the first and second detection electrodes XR and XL) C as a whole is obtained. It is kept constant to match the reference state.

Thus, in the present invention, between the combined capacitance CL between the reference common electrode BK and the first detection electrode XR adjacent to one side thereof, and the second detection electrode XL adjacent to the other side. Of the combined capacity CL, when one combined capacity is in a decreasing state, the other combined capacity is increased, or when one combined capacity is in an increasing state, the other combined capacity is decreased. Thus, the plurality of first capacitance adjusting sections 25A that form the capacitances n · C _A and n · C _B so that the total combined capacitance C (= CL + CR) as a whole is always constant. The second capacity adjustment unit 25B is adjusted. That is, each electrode pattern is formed so that one composite capacitor CL can complement the increase and decrease of the other composite capacitor CR.

  The above-described configuration is the same as above between the seven sets of common branch electrodes 22 arranged at a predetermined pitch in the Y direction and the Y detection electrodes 1y, 2y, 3y, 4y, 5y, 6y, 7y, and 8y. The treatment of has been given.

  For this reason, in the coordinate detection device 20 of the present invention, even when holes or the like are formed in the base sheet and each electrode cannot be wired in a straight line, the common electrode K and each X detection electrode or Y detection electrode are not connected. Can be maintained constant regardless of the location. Therefore, when a contact body such as a finger that is in contact with the ground is in contact with or close to the surface of the coordinate detection device 20, it is possible to detect the coordinate position in the X direction where the contact body has contacted or approached with high accuracy. .

FIG. 8 is a conceptual diagram showing an equivalent circuit on the X detection electrode side and a configuration of its voltage detection means.
In the voltage detecting means shown in FIG. 8, when the predetermined voltage Vin is applied to the common electrode K using the oscillating means 31 capable of oscillating the voltage Vin of a predetermined frequency, the X detecting electrodes 1x, 2x , 3x, 4x, 5x, and 6x are output with detection voltages Vout corresponding to the combined capacitors CR and CL. Therefore, for example, the X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x are sequentially selected at a predetermined sampling period by using the multiplexer 32 or the like, and the A / D conversion means (not shown) is used to select the X detection electrodes. Each detection voltage Vout output to 1x, 2x, 3x, 4x, 5x, and 6x can be acquired with high accuracy.

In the above embodiment, the voltage Vin is applied to the common electrode K, and the detection voltage Vout is detected from the X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x sides, but the present invention is not limited to this. Instead, the detection voltage Vout may be detected from the common electrode K by applying the voltage Vin to the X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x.

  In the above embodiment, the electrode pattern formed on one surface of the base sheet 21 is a common electrode and an X detection electrode, and the electrode pattern formed on the other surface is a Y detection electrode. The present invention is not limited to this, and an electrode pattern formed on one surface of the base sheet 21 is used as a common electrode and a Y detection electrode, and an electrode pattern formed on the other surface is used as an X detection electrode. It may be used. Furthermore, the electrode pattern formed on the one surface may be a Y detection electrode, and the electrode pattern formed on the other surface may be an X detection electrode. That is, a configuration in which the X detection electrode and the Y detection electrode are interchanged may be used.

  Next, a case where a coordinate detection device 40 as shown in FIG. 9 is provided inside the operation unit 11 will be described.

  FIG. 9 is a plan view showing a base sheet 21 and an electrode pattern constituting a coordinate detection apparatus as a second embodiment of the present invention, FIG. 10A is a plan view showing a partially enlarged view of FIG. 9, and FIG. FIG. In this case, the coordinate detection device 40 is fixed to the lower surface of the key mat via the adhesive 16.

  In FIG. 9, the solid lines without hatching mainly indicate the X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x formed on one surface of the base sheet 21, and the solid lines with hatching are formed on one surface. Common electrodes 1k, 2k, 3k, 4k, and 5k are shown. The dotted lines indicate the Y detection electrodes 1y, 2y, 3y, 4y, 5y, 6y, 7y, and 8y formed on the other surface of the base sheet 21. A thick square indicates the insertion hole 21 a, a thick rectangle indicates the passage hole 21 b, and a round hole indicates the attachment hole 21 c for fixing the base sheet 21.

  The coordinate detection device 40 has a film-like substrate sheet 21 having excellent flexibility. The base sheet 21 is made of a dielectric material. As shown in FIG. 9, the base sheet 21 is formed with an insertion hole 21 a for allowing the stem 12 b to pass therethrough and a passage hole 21 b that functions as a passage for guiding the light emitted from the light source 14 to the back of the operation key 12. Has been. Therefore, when the operation key 12 is pressed, the stem 12b can invert the reversing plate of the electronic component 15, so that a comfortable click feeling can be given to the operator.

  Further, since the light emitted from the light source 14 can pass through the passage hole 21b as a passage, the back surface of the key (operation member) 12 can be illuminated brightly. In this case, when the light source 14 for illumination is disposed so as to face the passage hole 21b formed in the base sheet 21, the character, symbol or figure printed on the key top 12a is clearly displayed even in the dark. It can be recognized.

  One surface of the base sheet 21 is provided with a plurality of X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x that extend in the Y direction and are arranged at predetermined intervals in the X direction. . A plurality of common electrodes 1k, 2k, 3k, 4k, 5k (common electrodes K) extending in the Y direction as a whole while avoiding the insertion holes 21a and passage holes 21b formed in the base sheet 21 are X detection electrodes. The positions are not in contact with 1x, 2x, 3x, 4x, 5x, and 6x, and are spaced apart in the X direction.

  The common electrodes 1k are arranged in the Y direction in the drawing and are opposed to the Y detection electrodes 1y, 2y, 3y, 4y, 5y, 6y, 7y, and 8y partially in parallel with each other. 1k5, 1k6, 1k7, 1k8, and extends in the Y direction on the left end side in the figure. Similarly, the common electrode 2k includes common counter electrodes 2k1, 2k2, 2k3, 2k4, 2k5, 2k6, 2k7, and 2k8 that face each of the Y detection electrodes 1y to 8y in parallel. The common electrode 3k includes common counter electrodes 3k2, 3k3, 3k4, 3k5, 3k6, 3k7, and 3k8 that are partially parallel to the Y detection electrodes 1y to 8y. Similarly, the common electrode 4k includes Each of the Y detection electrodes 1y to 8y has common counter electrodes 4k1, 4k2, 4k3, 4k4, 4k5, 4k6, 4k7, and 4k8 that are partially parallel to each other. Similarly, the common electrode 5k has each Y detection. Common counter electrodes 5k2, 5k3, 5k4, 5k5, 5k6, and 5k7 that are partially parallel to each of the electrodes 1y to 8y. It has a 5k8. The common electrodes 1k, 2k, 3k, 4k, and 5k are set to be equipotential by being connected by common counter electrodes 1k8, 2k8, 3k8, 4k8, and 5k8 on the Y2 side in the drawing. Of the common electrode K (common electrodes 1k, 2k, 3k, 4k, 5k), an end portion (common counter electrode 4k1) on the Y2 side of the common electrode 4k is provided with a ground lead line 28, which will be described later. It is connected to a control IC (control means) 50.

In the common electrode 1k, the common counter electrode 1k8 and the common counter electrode 1k7 adjacent in the Y direction are connected by the common counter electrode 1ka extending in the Y direction, and the common counter electrode 1k6 and the common counter electrode 1k5 are connected by the common counter electrode 1kb. The common counter electrode 1k4 and the common counter electrode 1k3 are connected by the common counter electrode 1kc, and the common counter electrode 1k5 and the common counter electrode 1k4 are connected by the common counter electrode 1kc. A common counter electrode 1kd extending in the Y direction is provided from the common counter electrode 1k2. The common counter electrodes 1ka, 1kb, 1kc, and 1kd extending in the Y direction and the X detection electrode 1x partially face each other, and a capacitance is formed therebetween.

  The pair of common counter electrode 1k7 and the common counter electrode 1k6, the pair of common counter electrode 1k5 and the common counter electrode 1k4, and the pair of common counter electrode 1k3 and the common counter electrode 1k2 are arranged to face each other in parallel. Similar parallel electrodes are formed as in the first embodiment.

  As in the first embodiment, the X detection electrode 1x is formed with a plurality of common branch electrodes 22 extending in the X direction, and each common branch electrode 22 is formed by a pair of common counter electrodes. A first capacitance adjusting unit is formed so as to face each other between the parallel electrodes.

  The X-direction electrode 2x is formed with a plurality of common branch electrodes 22 extending in the X1 and X2 directions. Each common branch electrode 22 is a parallel formed by a pair of common counter electrodes on the common electrode 1k or the common electrode 2k. A second capacitance adjusting portion is formed so as to be opposed between the electrodes.

Here, if the common electrode 1k is a reference common electrode BK, the X detection electrode 1x corresponds to the first detection electrode XR, and the X detection electrode 2x corresponds to the second detection electrode XL. For this reason, as in the first embodiment, the first capacitance adjustment unit and the second capacitance adjustment unit use the reference common electrode (common electrode 1k), the first detection electrode (X detection electrode 1x), and the first capacitance adjustment unit. It is possible to keep the fluctuation of the total combined capacitance C between the two detection electrodes (X detection electrode 2x) low, that is, to maintain the combined capacitance C formed between the electrodes constant.
Such a relationship is the same between other common electrodes and other X detection electrodes.

  On the other hand, in the Y detection electrode 8y linearly extending in the X direction, electrostatic capacitance is formed between the common counter electrodes 1k8, 3k8, and 5k8 located on the Y1 side of the Y detection electrode 8y in the drawing, and the Y detection is performed. A capacitance is formed between the common counter electrodes 2k8 and 4k8 located on the Y2 side of the electrode 8y. That is, the five common counter electrodes 1k8, 2k8, 3k8, 2k8, 4k8, and 5k8 are alternately opposed at the positions on both sides of the Y detection electrode 8y, and a predetermined capacitance is formed therebetween.

  Similarly, in the Y detection electrode 7y having the detours 26 and 26, the five common counter electrodes 1k7, 2k7, 3k7, 2k7, 4k7, and 5k7 are alternately opposed at positions on both sides of the Y detection electrode 7y. A predetermined capacitance is formed between the two. Similarly, the Y detection electrodes 6y, 5y, 4y, 3y, and 2y excluding the Y detection electrode 1y are also formed with a predetermined capacitance via the five common counter electrodes.

  By the way, as shown in FIG. 9, a voltage of a predetermined sampling period is applied to the base sheet 21 between each X detection electrode and the common electrode K and between each Y detection electrode and the common electrode K. A control IC 50 for detecting the displacement of the capacitance is provided. A lead line 27 extending to the connection terminal of the control IC 50 at the Y2 side end of each X detection electrode 1x, 2x, 3x, 4x, 5x, 6x formed on one surface of the base sheet 21. Are connected to each other.

On the other surface of the base sheet 21, the Y detection electrodes 1y, 2y, 3y, 4y are connected to the Y detection electrodes 5y, 6y, 7y, 8y via the lead lines 29 provided at the end portion on the X2 side in the drawing. Are connected to the control IC 50 via respective lead lines 29 provided at the end on the X1 side in the drawing.

  The lead lines 27, 28, 29 are densely arranged on the Y2 side of the Y detection electrode 1y. In addition, three insertion holes 21a, 21a, 21a are arranged to face each other on the Y1 side of the Y detection electrode 1y. For the Y detection electrode 1y, the common counter electrodes 2k1 and 4k1 of the portion not having the insertion hole 21a are opposed to each other on the Y1 side of the Y detection electrode 1y, and this portion forms a capacitance. In the portion where the hole 21a is provided, it is physically impossible to dispose the common counter electrode with respect to the Y detection electrode 1y. Moreover, since the lead lines 27, 28, 29 are densely arranged on the Y2 side of the Y detection electrode 1y, it is impossible to arrange the common counter electrode in this portion.

Therefore, the capacitance C _1y for the Y detection electrode 1y is formed between the two common counter electrodes 2k1, 4k1 provided on the Y1 side and the Y detection electrode 1y, and the other Y detection electrodes 2y to 8y. The capacitances formed by the five common counter electrodes, such as the capacitance for C _2y , C _3y , C _4y , C _5y , C _6y , C _7y , and C _8y , must be significantly reduced. _{(C 1y <C 2y, C} 3y, C 4y, C 5y, C 6y, C 7y, C 8y). For this reason, there is a possibility that the coordinate position along the Y detection electrode 1y cannot be detected correctly.

  Therefore, in the present invention, the first adjustment electrodes 1ya and 1yb capable of facing the common counter electrodes 1kd and 5kd are provided on the Y detection electrode 1y, and the operation thereof will be described below.

  The common counter electrodes 1kd and 5kd are each formed as an electrode extending in the Y direction in the figure at the position of the left side or the right side of the insertion hole 21a. On the other hand, first adjustment electrodes 1ya and 1yb extending in the Y1 direction from the Y detection electrode 1y are faced to the common counter electrodes 1kd and 5kd at the ends on the X2 and X1 sides in the figure. As shown in FIGS. 10A and 10B, the first adjustment electrodes 1ya and 1yb and the common counter electrodes 1kd and 5kd are opposed to each other with a base material sheet 21 made of a dielectric provided therebetween. A capacitance Ca proportional to the opposing area is formed between the two.

  Since the width dimension W of the opposing portion of each electrode is larger than the film thickness dimension δ of the electrode, the capacitance value per unit length of the electrode is the first adjustment electrode 1ya, 1yb and the common counter electrode 1kd, The capacitance Ca when the surface is opposed to 5 kd can be made sufficiently larger than the capacitance Cb when the electrodes are arranged in parallel and the film thickness dimensions δ are opposed to each other.

That is, the Y sensing electrode 2y to capacitance _C 2y against _{8y, C 3y, C 4y,} C 5y, C 6y, C 7y, compared etc. _{C 8y,} the capacitance _{C 1y} for Y sensing electrodes 1y The shortage can be supplemented with the capacitance Ca formed by making the first adjustment electrodes 1ya, 1yb and the common counter electrodes 1kd, 5kd face each other. Therefore, to not Y detection electrodes 1y may be of the same order of magnitude every capacitance to _{8y (C 1y ≒ C 2y ≒} C 3y ≒ C 4y ≒ C 5y ≒ C 6y ≒ C 7y ≒ C 8y).

  However, when the insufficient capacitance cannot be replenished even by the capacitance Ca formed in the surface facing portion between the first adjustment electrodes 1ya and 1yb and the common counter electrodes 1kd and 5kd, for example, FIG. As shown in 9 and 10, a second adjustment electrode 1yc adjacent to the first adjustment electrodes 1ya and 1yb and facing in parallel at a position not overlapping each other across the base sheet 21 is formed. Alternatively, the electrostatic capacity Cb formed between the adjustment electrode 1yc and the common counter electrodes 1kd and 5kd may be supplemented with an insufficient amount of electrostatic capacity.

The capacitance _{C 1y} for Y sensing electrodes 1y is, other each Y detection electrodes 2y to capacitance _C 2y against _{8y, C 3y, C 4y,} C 5y, C 6y, C 7y, too than _{C 8y} In this case, as shown in FIG. 10A, the lengths of the first adjustment electrodes 1ya and 1yb are cut short, and a substantial gap between the first adjustment electrodes 1ya and 1yb and the common counter electrodes 1k1 and 5k1 is obtained. The capacitance C _1y is adjusted to the same predetermined value as the capacitances C _2y , C _3y , C _4y , C _5y , C _6y , C _7y , and C _8y by reducing the common facing area. It may be. The adjustment in this case may be performed by cutting the first adjustment electrodes 1ya and 1yb as described above, or by cutting the common counter electrodes 1kd and 5kd.

  The Y detection electrode 1y including the first adjustment electrodes 1ya and 1yb, the common electrodes 1k and 5k including the common counter electrodes 1kd and 5kd, and the like are formed on the surface of the base sheet 21 using an edging process or the like. Since it can be formed by patterning, the cutting is also easy.

  Further, when the length dimension of the first adjustment electrodes 1ya and 1yb after cutting or the length dimension of the common counter electrodes 1kd and 5kd after cutting is known in advance, a predetermined length is obtained at the patterning stage. Can be formed. In this case, it is preferable in that the cutting work for adjustment can be made unnecessary.

  As described above, in the case of the second embodiment, the lead lines are densely arranged in the vicinity of the Y detection electrode 1y provided on the outside, or holes are formed, so that the Y detection electrode 1y can be formed. Even in the case where the common counter electrode forming the electrostatic capacitance cannot be disposed to face each other, the shortage of the electrostatic capacitance can be supplemented, so that the coordinate position can be detected correctly.

  In the second embodiment, the Y detection electrode 1y has been described as an example of the electrode provided on the outside. However, the present invention is not limited to this, and any electrode provided on the outside may be used for Y detection. It may be the electrode 8y or the X detection electrode 1x or 6x.

FIG. 1 is a plan view showing a mobile phone as an information terminal device in which the coordinate detection device of the present invention is mounted II-II line sectional view of FIG. The top view which shows the base material sheet and electrode pattern which comprise a coordinate detection apparatus as 1st Embodiment of this invention, FIG. 4 is a plan view showing an X detection electrode and a common electrode formed on one surface of the substrate sheet of FIG. 3; FIG. 4 is a plan view when the common electrode formed on one surface of the base sheet of FIG. 3 and the Y detection electrode formed on the other surface are viewed from the same direction as FIG. An enlarged plan view showing a reference common electrode and two X detection electrodes adjacent to the common electrode, FIG. 2 is an enlarged plan view showing a relationship between a common branch electrode provided on a reference common electrode and a parallel electrode provided on an adjacent X detection electrode; Conceptual diagram showing the equivalent circuit on the X detection electrode side and the configuration of its voltage detection means, The top view which shows the base material sheet and electrode pattern which comprise a coordinate detection apparatus as 2nd Embodiment of this invention, A is a partially enlarged plan view of FIG. 9, B is a cross-sectional view thereof,

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mobile phone 11 Operation part 11A Upper case 11B Lower case 12 Operation key (operation member)
12a Key top 12b Stem 14 Light source 15 Electronic component 20, 40 Coordinate detection device 21 Base sheet 21a Insertion hole 21b Passage hole 22 Common branch electrode 23 First auxiliary electrode 23a, 23b Parallel electrode 24 Second auxiliary electrode 24a, 24b Parallel electrode 25A First capacitance adjustment unit 25B Second capacitance adjustment unit 26, 26a, 26b, 26c, 26d, 26e Detours 27, 28, 29 Lead line 31 Oscillating means 32 Multiplexer 50 Control IC (control means)
C1 Original capacitance C2 between the reference common electrode and the first X detection electrode C2 Original capacitance C between the reference common electrode and the second X detection electrode C _A Static capacitance in the first capacitance adjustment unit Capacitance C _B Capacitance CR in the second capacitance adjusting unit Combined capacitance CL between the reference common electrode and the first detection electrode Combined capacitance C between the reference common electrode and the second detection electrode C Reference common electrode Total combined capacitances K, 1k, 2k, 3k, 4k, 5k between the first and second detection electrodes Common electrodes 1k1 to 1k8 Common counter electrodes 2k1 to 2 provided on the common electrode 1k and extending in the X direction 2k8 Common counter electrodes 3k1 to 3k8 provided on the common electrode 2k and extending in the X direction Common counter electrodes 4k1 to 4k8 provided on the common electrode 3k and extending in the X direction are provided on the common electrode 4k and extend in the X direction Common counter electrodes 5k1 to 5k8 Common counter electrodes 1ka to 1kd provided on the common electrode 5k and extending in the X direction Common counter electrodes 5ka to 5kd provided on the common electrode 1k and extending in the Y direction Provided on the common electrode 5k and in the Y direction Extending common counter electrode 1x, 2x, 3x, 4x, 5x, 6x X detection electrode 1y, 2y, 3y, 4y, 5y, 6y, 7y, 8y Y detection electrode 1ya, 1yb First adjustment electrode 1yc Second adjustment electrode

Claims (12)

A plurality of detection electrodes that extend in the Y direction and are spaced from each other in the X direction and to which a voltage is applied to each of the base sheet, and a plurality of detection electrodes that are positioned between the adjacent detection electrodes and extend in the Y direction A common electrode is formed,
When a contact body, which is a conductor, contacts or approaches the base sheet, a change in capacitance between each of the detection electrodes and the common electrode opposed thereto is detected, and the contact body contacts or approaches In the electrostatic capacitance type coordinate detection apparatus in which the position on the XY coordinate plane is detected,
Any one of the common electrodes is used as a reference common electrode, the first detection electrode adjacent to one side of the reference common electrode among the detection electrodes, and the second detection electrode adjacent to the other side. When
In a specific place, at least one of the reference common electrode and the first detection electrode, and the reference common electrode and the second detection electrode is formed with a detour approaching the other. Capacitance type coordinate detection device.   The electrostatic capacitance type coordinate detection apparatus according to claim 1, wherein a hole is formed in the base sheet, and the bypass is formed on a side of the hole.   An operating member is provided on one side of the base sheet, and an electronic component operated by the operating member is provided on the other side, and a part of the operating member passes through the hole to operate the electronic component. The capacitance type coordinate detection apparatus according to claim 2, which is made possible.   The electrostatic capacity type coordinate detection device according to claim 2, wherein a light source for illumination is disposed in a hole of the base sheet, or the hole is a passage of light emitted from the light source. When the capacitance between the reference common electrode and the first detection electrode is CR, and the capacitance between the reference common electrode and the second detection electrode is CL,
5. The pattern of each electrode is set so that the combined capacitance of the capacitance CR and the capacitance CL is maintained constant when one capacitance complements the increase / decrease in the other capacitance. The electrostatic capacity type coordinate detection apparatus according to any one of the above. The reference common electrode is formed with a common branch electrode spaced in the Y direction and extending on both sides in the X direction. The first detection electrode extends in the X direction and faces the common branch electrode. Each of the second detection electrodes is formed with a second auxiliary electrode extending in the X direction and facing the common branch electrode,
The common branch electrode and the first auxiliary electrode are provided in the detour or in the vicinity of the detour, and the common branch electrode and the second auxiliary electrode are provided in the detour or in the vicinity of the detour. The electrostatic capacity type coordinate detection apparatus according to claim 1, wherein the two are not opposed to each other. The reference common electrode is formed with a common branch electrode spaced in the Y direction and extending on both sides in the X direction. The first detection electrode extends in the X direction and faces the common branch electrode. Each of the second detection electrodes is formed with a second auxiliary electrode extending in the X direction and facing the common branch electrode,
In the vicinity of the detour or in the vicinity of the detour, the opposing length dimension of the common branch electrode and the first auxiliary electrode is longer than the opposing length dimension of the common branch electrode and the second auxiliary electrode. The capacitance type coordinate detection device according to claim 1, wherein the capacitance type coordinate detection device is formed.   The electrostatic capacitance type coordinate detection apparatus according to claim 1, wherein the X direction is replaced with a Y direction, and the Y direction is replaced with an X direction.   It is possible to input both the coordinate position in the X direction and the coordinate position in the Y direction of the contact portion of the contact body, comprising the one according to claim 1 to claim 7 and the one according to claim 8. Capacitance type coordinate detection device characterized by the above. A base sheet in which a plurality of holes are formed, and a plurality of X detection electrodes that extend in one direction on the one surface of the base sheet and are arranged at a predetermined interval in the X direction and are each given a voltage. A plurality of Y detection electrodes that extend in the X direction on the other surface of the base sheet and are arranged at predetermined intervals in the Y direction and are each given a voltage, and are provided on either side and adjacent to each other A plurality of common electrodes facing both of the matching X detection electrode and the adjacent Y detection electrode, and between the X detection electrode and the common electrode and between the Y detection electrode and the common electrode at a predetermined timing. In a capacitive coordinate detection apparatus having a control means for applying a voltage, and a plurality of lead lines connecting between the individual X detection electrodes and the Y detection electrodes and the control means,
The lead wires are concentrated in the vicinity of the outer side of the X detection electrode or the Y detection electrode located at either end, and the hole is arranged opposite to the inner side of the X or Y detection electrode. And
One of the X detection electrode or the Y detection electrode and the common electrode opposed to each other with the base material sheet interposed therebetween is arranged so that the X detection electrode or the Y detection electrode and the common electrode face each other, thereby causing the X detection electrode or the Y detection. A capacitance-type coordinate detection device, wherein a first adjustment electrode for adjusting capacitance between an electrode and the common electrode is formed.   One of the X detection electrode or the Y detection electrode and the common electrode facing each other with the base material sheet interposed therebetween is adjacent to the first adjustment electrode at a position that does not overlap with each other with the base material sheet interposed therebetween. The electrostatic capacity type coordinate detection apparatus according to claim 10, wherein two adjustment electrodes are formed.   The common counter electrode according to claim 10 or 11, wherein the common electrode is provided with a common counter electrode that faces both of the pair of adjacent X detection electrodes and the pair of adjacent Y detection electrodes and extends around the hole. Capacitance type coordinate detection device.

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