JP2006344195A - Capacitance type coordinate detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacitance type coordinate detector capable of widening an area of a detecting region allowing the detection of high precision. <P>SOLUTION: A substrate 21 has wiring regions 30, 31, 32 positioned with leading-out parts 27, 29a, 29b consecutive to detecting electrodes 1x, 2x, 3x, 4x, 5x, 6x, 1y, 2y, 3y, 4y, 5y, 6y, 7y, 8y. The leading-out parts 27, 29a, 29b are extended along a direction crossed with a direction along which the detecting electrodes 1x, 2x, 3x, 4x, 5x, 6x, 1y, 2y, 3y, 4y, 5y, 6y, 7y, 8y are extended, in a wiring region 34, and the substrate 21 is deformed to separate the wiring regions 30, 31, 32 from a surface 21e. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coordinate detection device mounted on an information terminal device such as a mobile phone, and more particularly to a capacitance-type coordinate detection device capable of increasing the area of a detection region that can be detected with high accuracy.

  FIG. 8 is a plan view showing a conventional electrostatic capacitance type coordinate detection apparatus. The capacitance type coordinate detection device 120 shown in FIG. 8 has a film-like substrate sheet 121 formed of a dielectric. As shown in FIG. 8, on the back surface of the base sheet 121, a plurality of X detection electrodes (electrodes extending in the Y direction) that extend in the Y direction and are spaced at predetermined intervals in the X direction 101x, 102x, 103x, 104x, 105x, 106x, which extend in the Y direction and have a predetermined interval in the X direction, and between the individual X detection electrodes The plurality of common electrodes 101k, 102k, 103k, 104k, and 105k arranged in the wiring are arranged so as not to contact each other. The common electrodes 101k, 102k, 103k, 104k, and 105k are connected to each other at the end on the Y2 side, and are drawn out of the base sheet 121 as the common electrode 100K.

  Further, as shown by a broken line in FIG. 8, a plurality of Y detection electrodes (electrodes extending in the X direction) that extend in the X direction and are arranged at a predetermined interval in the Y direction on the surface of the base sheet 121. , Electrodes for detecting the Y coordinate of the contact or approach position of the conductor) 101y, 102y, 103y, 104y, 105y, 106y, 107y, 108y. In FIG. 8, the common electrodes 101k, 102k, 103k, 104k, and 105k provided on the back surface of the base sheet 121 are indicated by solid lines.

  A plurality of X detection electrodes 101x, 102x, 103x, 104x, 105x, 106x provided on one side of the base sheet 121 and a plurality of Y detection electrodes 101y, 102y, 103y, 104y, 105y, 106y provided on the other side 107y and 108y are arranged so as to cross each other vertically on both surfaces of the base sheet 121.

  As shown in FIG. 8, the common electrodes 101k, 102k, 103k, 104k, and 105k are formed with a plurality of common branch electrodes 122 that extend linearly with a predetermined length toward both sides in the X direction. The individual common branch electrodes 122 are provided so as to intersect the common electrodes 101k, 102k, 103k, 104k, and 105k with a predetermined interval in the Y direction, and the tips in both sides (X1 and X2) are Basically, it extends to a position just before the X detection electrodes 101x, 102x, 103x, 104x, 105x, 106x.

  As shown in FIG. 8, the X detection electrodes 101x, 102x, 103x, 104x, 105x, and 106x are connected to the lead portions 101xa, 102xa, 103xa, 104xa, 105xa, and 106xa at the Y1 side end portions, respectively. It is connected to a control IC (not shown) via the sections 101xa, 102xa, 103xa, 104xa, 105xa, and 106xa.

  The Y detection electrodes 101y, 102y, 103y, 104y, 105y, 106y, 107y, 108y are connected to the lead-out portions 101ya, 102ya, 103ya, 104ya, 105ya, 106ya, 107ya, 108ya at the ends on the X1 side, respectively. The lead-out portions 101ya, 102ya, 103ya, 104ya, 105ya, 106ya, 107ya, and 108ya are connected to a control IC (not shown).

  In the coordinate detection device 120 shown in FIG. 8, a plurality of common electrodes 101k, 102k, 103k, 104k, and 105k, and the two X detection electrodes 101x, adjacent to the common electrodes 101k, 102k, 103k, 104k, and 105k in the X direction. 102x, 103x, 104x, 105x, and 106x are coupled by their respective capacitances C. Therefore, when a pulse voltage Vin is applied to the X detection electrodes 101x, 102x, 103x, 104x, 105x, and 106x, the common electrodes 101k, 102k, 103k, 104k, and 105k pass through the capacitance C to the above-described capacitance. A voltage Vin is applied.

  From this state, when a conductor, such as a finger, is in contact with or close to the coordinate detection device 120, the common electrodes 101k, 102k, 103k, 104k, 105k and the X detection electrodes 101x, Since the electric charge applied between 102x, 103x, 104x, 105x, and 106x is induced to the conductor, the capacitance C is reduced, and the X detection electrodes 101x, 102x, 103x, 104x, 105x, The detection voltage Vout corresponding to the change in the capacitance C is output from 106x. Since the detection voltage Vout changes corresponding to the distance between the conductor and the X detection electrode, the voltage values of the X detection electrodes 101x, 102x, 103x, 104x, 105x, and 106x are sequentially detected at a constant cycle. Thus, the coordinate position of the conductor in the X direction can be determined.

  On the other hand, a plurality of common branch electrodes 22 formed on the common electrodes 101k, 102k, 103k, 104k, and 105k, and the Y detection electrodes 101y, 102y, 103y, 104y, 105y, 106y, 107y, and the like provided therebetween. Since 108y is opposed to each other, the same electrostatic capacitance C as above is also formed between the common branch electrode 122 and two Y detection electrodes adjacent in the Y direction. Therefore, as in the case of the X detection electrode, a pulse voltage Vin having a predetermined period is applied to the common electrode K side, and the detection voltage output from the Y detection electrodes 101y, 102y, 103y, 104y, 105y, 106y, 107y, and 108y. By sequentially detecting Vout at a predetermined cycle, it is possible to determine the coordinate position of the conductor in the Y direction.

  The coordinate detection device 120 shown in FIG. 8 is mounted on an information terminal device in a state where the base sheet 121 is in a planar shape and is fixed in a case portion of the information terminal device.

Thus, the idea that the capacitive coordinate detection device is mounted on the information terminal device in a planar shape is disclosed in Patent Document 1 shown below.
JP 2002-123363 A

  In the conventional electrostatic capacitance type coordinate detection device 120 as shown in FIG. 8, as shown in FIG. 8, the interval between the adjacent lead portions 101xa, 102xa, 103xa, 104xa, 105xa, 106xa is the X detection. The distance between the electrodes 101x, 102x, 103x, 104x, 105x, 106x is smaller than that between the electrodes 101x, 102x, 103x, 104x, 105x, 106x, and the lead-out portions 101xa, 102xa, 103xa, 104xa, 105xa, 106xa are connected to the X detection electrodes 101x, 102x, 103x, 104x, In the vicinity of the operation region having 105x and 106x, it extends in a direction orthogonal to these X detection electrodes.

  Therefore, when a conductor such as a finger moves to the end in the Y1 direction in the operation region, the conductor approaches the lead-out portions 101xa, 102xa, 103xa, 104xa, 105xa, and 106xa, and the charge in the lead-out portion is transferred to the conductor. It is induced and an error is likely to occur in position detection in the X coordinate direction.

  The lead-out portions 101ya, 102ya, 103ya, 104ya, 105ya, 106ya, 107ya, 108ya are inclined from the end of the Y detection electrode 101y, 102y, 103y, 104y, 105y, 106y, 107y, 108y on the X1 side. It extends in the crossing direction.

  For this reason, when the conductor moves to the end in the X1 direction in the operation region, the conductor approaches the drawer portion extending obliquely, so that an error is likely to occur in position detection in the Y coordinate direction.

  Further, the lead portions 101xa, 102xa, 103xa, 104xa, 105xa, 106xa are wired at a large distance from the operation area, or the lead portions 101ya, 102ya, 103ya, 104ya, 105ya, 106ya, 107ya, 108ya are operated. It is possible to reduce or prevent the false detection by wiring at a large distance from the region. However, if formed in this way, the area of the base sheet 121 needs to be increased, and thus the coordinate detection device 120 becomes large, so that it is not suitable for mounting on a small information terminal device.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a capacitance type coordinate detection apparatus capable of increasing the area of a detection region that can be detected with high accuracy.

The present invention includes a substrate formed of an insulating material and having an operation-side surface to which a conductor contacts or approaches and a back surface opposite to the substrate, and a substrate positioned on the front surface or the back surface and extending in parallel in one direction. A plurality of detection electrodes, and a common electrode positioned on the front surface or the back surface and spaced from the detection electrode, and when a conductor contacts or approaches the surface, the detection electrodes In the coordinate detection device in which the capacitance between the common electrode changes,
The substrate has a wiring region in which a lead portion continuous with the detection electrode is located, and in the wiring region, the lead portion extends in a direction intersecting with a direction in which the detection electrode extends,
The substrate is deformed so that the lead portion is separated from the conductor contacting the surface.

In this case, the detection electrode includes an X detection electrode provided on one surface of the front surface and the back surface of the substrate, and a Y detection electrode provided on the other surface and extending orthogonally to the X detection electrode,
The substrate has a wiring region in which the lead portion continuous with the X detection electrode is located, and a wiring region in which the lead portion continuous with the Y detection electrode is located, and at least one lead portion has The substrate can be configured to be deformed so as to be separated from the conductor.

  The substrate is a flexible substrate, and the substrate includes a planar operation region in which the detection electrode and the common electrode are located, and the wiring region. The operation region, the wiring region, It is preferable that the wiring region is bent through a bend line set at the boundary.

  In the above, it is more preferable that the bending angle of the wiring area with respect to the operation area is 90 degrees.

  In the coordinate detection apparatus of the present invention, the substrate is deformed so that the wiring region where the lead portion continuous from the detection electrode is located is separated from the operation side surface of the substrate. Therefore, the distance between the conductor and the wiring region can be increased, and the conductor can prevent the lead-out portion of the wiring region from affecting the detection operation. Further, the planar shape of the coordinate detection device can be reduced, and it is suitable for mounting on a small device.

Embodiments of the present invention will be described below with reference to the drawings.
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 cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a plan view showing a state in which the base sheet and the electrode pattern constituting the coordinate detection device are viewed from the back side as an embodiment of the present invention, and FIG. 5 is a view of the Y detection electrode formed on the surface of the base sheet. It is a top view which shows the state which saw the electrode pattern seeing through from the same direction as FIG.

  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 combined together. A plurality of opening holes 11A1 are formed in the upper case 11A, and a key top 12a that is a surface of the operation key 12 is exposed to the outside from these opening holes 11A1. Characters, symbols or figures are printed on the key top 12a.

  In the mobile phone 10, the upper surface 11 </ b> A <b> 2 of the upper case 11 </ b> A and the key top 12 a that is the surface of the operation key 12 serve as an operation surface for bringing a conductor 40 such as a finger into contact with or approaching.

  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). 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 stem mat 17 made of a transparent or translucent synthetic resin is formed below each operation key 12 (Z2 direction side in the drawing). The stem mat 17 is integrally formed with a plurality of stems (pressing convex portions) 17a configured in a columnar shape, for example, and the stems 17a extend in the apparatus internal direction (Z2 direction in the drawing).

  The operation key 12 is formed at a position facing the stem 17a in the vertical direction (Z1-Z2 direction in the drawing).

  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 tip end of the stem 17a facing the operation key 12 in the vertical direction is arranged to face 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. When the operation key 12 is pressed, the stem 17a can reverse the reversal plate of the electronic component 15, so that a comfortable click feeling can be given to the operator.

  As shown in FIG. 2, a coordinate detection device 20 is provided inside the operation unit 11, and the coordinate detection device 20 is connected to the stem mat 17 via a bonding means (not shown) such as an adhesive or an adhesive tape. It is fixed to the lower surface of the.

  FIG. 4 is a plan view showing a state in which the base material sheet and the electrode pattern constituting the coordinate detection device 20 are viewed from the back surface 21d. In the coordinate detecting device 20, the surface 21e opposite to the back surface 21d shown in FIG. 4 is directed upward (in the Z1 direction) shown in FIGS. 2 and 3, and the back surface 21d opposite to the surface 21e is shown in FIG. And it mounts in the said mobile telephone 10 toward the downward direction (illustrated Z2 direction) shown in FIG. Therefore, in the embodiment shown in FIGS. 2 and 3, the surface 21 e faces the operation surface formed by the surface 11 </ b> A <b> 2 and the key top 12 a that is the surface of the operation key 12. Therefore, the surface 21e is an operation-side surface that contacts or approaches the conductor 40. However, the back surface 21d may be mounted on the cellular phone 10 so that the back surface 21d is positioned on the operation area side. In this case, the back surface 21d is an operation-side surface with which the conductor 40 contacts or approaches.

  As shown in FIG. 4, the coordinate detection device 20 includes a film-like base sheet 21 that is excellent in flexibility. In addition, the said base material sheet 21 comprises the board | substrate of this invention, and this base material sheet 21 is formed with the insulating material. As shown in FIGS. 2 and 4, the base sheet 21 has an insertion hole 21 a for allowing the stem 17 a to pass therethrough and light emitted from the light source 14 through the stem mat 17 to the back of the operation key 12. A passage hole 21b is formed which functions as a passage leading to An attachment hole 21c for fixing the base sheet 21 is formed. In FIG. 4, a thick square indicates the insertion hole 21a, a thick rectangular shape indicates the passage hole 21b, and a round hole indicates the mounting hole 21c.

  Since the light emitted from the light source 14 can pass through the passage hole 21b as a passage, the operation key (operation member) 12 of the operation key (operation member) 12 is passed through the stem mat 17 formed of transparent resin or translucent resin. The back 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, character, symbol or figure printed on the key top 12a is displayed in the dark. It can be clearly recognized.

  A passage hole for allowing light from the light source 14 to pass through may be formed in the stem mat 17. In this case, the stem mat 17 may not be transparent or translucent. The light source 14 may not be formed, but in this case, the stem mat 17 may not be transparent or translucent.

  As shown in FIG. 4, a plurality of X detection electrodes (electrodes extending in the Y direction) are arranged in the Y direction and at predetermined intervals in the X direction so as to be positioned on the back surface 21 d of the base sheet 21. In addition, electrodes for detecting the X coordinate of the contact or approach position of the conductor 40) 1x, 2x, 3x, 4x, 5x, 6x are provided. 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.

  In FIG. 4, the solid lines without hatching mainly indicate the X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x formed on the back surface 21d of the base sheet 21, and the solid lines with hatching are formed on the back surface 21d. Common electrodes 1k, 2k, 3k, 4k, and 5k are shown.

  As shown by a broken line in FIG. 4 and a solid line in FIG. 5, a plurality of Y detection electrodes (X that extend in the X direction and are arranged at predetermined intervals in the Y direction on the surface 21 e of the base sheet 21. 1 y, 2 y, 3 y, 4 y, 5 y, 6 y, 7 y, 8 y are electrodes extending in the direction and detecting the Y coordinate of the contact or approach position of the conductor 40, and the X detection electrodes 1 x, 2 x, 3 x , 4x, 5x, and 6x.

  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 connected by common counter electrodes 1k8, 2k8, 3k8, 4k8, and 5k8 on the Y2 side in the drawing. A ground lead-out portion 28 extends from an end portion (common counter electrode 4k1) on the Y2 side of the common electrode 4k of the common electrode K (common electrodes 1k, 2k, 3k, 4k, 5k), for control to be described later An IC (control means) 50 is connected.

  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.

  A pair of common counter electrode 1k7 and common counter electrode 1k6, a pair of common counter electrode 1k5 and common counter electrode 1k4, and a pair of common counter electrode 1k3 and common counter electrode 1k2 are arranged to face each other in parallel. Is forming.

  A plurality of common branch electrodes 22 extending in the X direction are formed on the X detection electrode 1x, and each common branch electrode 22 is disposed between parallel electrodes formed by a pair of common counter electrodes. 1 capacity adjusting portion is formed.

  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, a reference common electrode (common electrode 1k), a first detection electrode (X detection electrode 1x), and a second detection electrode (X detection electrode) are formed by the first capacitance adjustment unit and the second capacitance adjustment unit. 2x), it is possible to keep the fluctuation of the total composite capacitance C low, that is, to keep the composite 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 that linearly extends in the X direction, a capacitance is formed between the Y detection side of the Y detection electrode 8y and the common counter electrodes 1k8, 3k8, and 5k8, and the Y detection electrode 8y. Between the Y2 side and the common counter electrodes 2k8 and 4k8. 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.

  As shown in FIG. 4, 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, so A control IC 50 for detecting the displacement is provided. A plurality of X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x formed on the back surface 21d of the base sheet 21 extend from respective end portions on the Y2 side to the connection terminals of the control IC 50. A drawer portion 27 is formed. The plurality of lead portions 27 extend in directions orthogonal to the X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x, respectively.

  As shown in FIGS. 4 and 5, on the surface 21e of the base sheet 21, the Y detection electrodes 1y, 2y, 3y, 4y are passed through a plurality of lead portions 29a extending from respective end portions on the X2 side in the drawing. , Y detection electrodes 5y, 6y, 7y, 8y are respectively connected to the control IC 50 through a plurality of lead portions 29b extending from respective end portions on the X1 side in the drawing. The lead portion 29a and the lead portion 29b extend in directions orthogonal to the Y detection electrodes 5y, 6y, 7y, and 8y, respectively.

  5 is a plan view showing a state in which the electrode pattern of the Y detection electrode formed on the front surface 21e of the base sheet 21 is viewed from the back surface 21d, and thus the Y formed on the front surface 21e. The detection electrodes 1y, 2y, 3y, 4y, 5y, 6y, 7y, 8y, and the lead portions 29a and 29b should be indicated by broken lines, but in FIG. 5, the Y detection electrode is shown for easy understanding of the structure. 1y, 2y, 3y, 4y, 5y, 6y, 7y, 8y and the lead-out portions 29a and 29b are indicated by solid lines.

  In the coordinate detection apparatus 20, if one of the plurality of common electrodes 1k, 2k, 3k, 4k, 5k, for example, the common electrode 3k is used as 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.

  When a pulsed voltage Vin is applied to the X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x using an oscillating means (not shown) or the like, a predetermined value is provided between the reference common electrode 3k and the X detection electrode 3x. The predetermined capacitance C2 is formed between the reference common electrode 3k and the X detection electrode 4x.

  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 equal to the opposing length dimension, both capacitances are C1 = C2, and the balance between both electrodes is in a state of adjustment.

  From this state, when the conductor 40, which is a conductor and is in a grounded state such as a finger, is brought into contact with or close to the surface 21e on which the reference common electrode 3k is formed, the reference common electrode 3k and the X detection electrode Since the electric charge applied between 3x and 4x is induced in the conductor 40, 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 conductor 40 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. Therefore, by sequentially detecting the voltage values of the X detection electrodes 1x, 2x, 3x, 4x, 5x, and 6x at a constant period, the coordinate position of the conductor 40 in the X direction (the back surface 21d) in the surface 21e. It is possible to determine the position of the X coordinate of the conductor 40 in the back surface 21d when it is mounted on the mobile phone 10 so as to be located on the operation area side.

  Meanwhile, common counter electrodes 1k2 to 1k8, 2k1 to 2k8, 3k1 to 3k8, 4k1 to 4k8, 5k1 to 5k8 are formed on the common electrodes 1k, 2k, 3k, 4k, and 5k, and the Y detection electrode 1y , 2y, 3y, 4y, 5y, 6y, 7y, and 8y partially face each other in parallel.

  If any one of the common counter electrodes 1k2 to 1k8, 2k1 to 2k8, 3k1 to 3k8, 4k1 to 4k8, 5k1 to 5k8 is a reference common electrode, a Y detection electrode adjacent to the reference common electrode in the Y direction Capacitances C1 and C2 similar to the above are also formed between the two. Therefore, as in the case of the X detection electrodes, the Y detection electrodes 1y, 2y, 3y, 4y, 5y, 6y, 7y, 8y are given a pulse voltage Vin of a predetermined period, and the Y detection electrodes 1y, 2y, 3y, By sequentially detecting the detection voltage Vout output from 4y, 5y, 6y, 7y, and 8y in a predetermined cycle, the coordinate position in the Y direction of the conductor 40 in the front surface 21e (the back surface 21d is on the operation region side). It is possible to determine the position of the X coordinate of the conductor 40 in the back surface 21d when it is mounted on the mobile phone 10 so as to be located at the position.

  The coordinate detection device 20 can input the coordinate information of the conductor 40 to the mobile phone 10 by acquiring the coordinate position in the X direction and the coordinate position in the Y direction.

  In the coordinate detection device 20, as shown in FIG. 5, each lead portion 29a is bent at a substantially right angle with respect to the Y detection electrodes 1y, 2y, 3y, 4y, and is on the X1 side of the base sheet 21. It extends parallel to the edge 21h. The plurality of lead portions 29a are densely arranged in the wiring region 30 formed on the side edge 21h side.

  Each of the lead portions 29b is bent at a substantially right angle with respect to the Y detection electrodes 5y, 6y, 7y, and 8y, and extends in parallel with the side edge 21i on the X2 side of the base sheet 21. The plurality of lead portions 29b are densely arranged in the wiring region 31 formed on the side edge 21i side. However, the lead portions 29a and 29b are not densely arranged in the wiring regions 30 and 31, but the lead portions 29a and the lead portions 29b are sparsely arranged in the wiring regions 30 and 31 with a space therebetween. May be.

  As shown in FIG. 4, each of the lead-out portion 27 and the lead-out portion 28 are bent substantially at right angles to the X detection electrodes 1x, 2x, 3x, 4x, 5x, 6x, and the Y2 side of the base sheet 21 It extends in parallel with the front edge 21f. The plurality of lead portions 27 are densely arranged in the wiring region 32 formed on the front edge 21f side. However, the plurality of lead portions 27 may not be densely arranged in the wiring region 32, but the plurality of lead portions 27 may be sparsely arranged in the wiring region 32 with an interval.

  In the coordinate detection device 20, as shown in FIG. 2, the wiring region 30 in which the lead portion 29a is formed is deformed downward (Z2 direction shown in FIG. 2) so as to be away from the conductor 40. is doing. In the embodiment shown in FIG. 2, the wiring region 30 in which the lead portion 29a is formed is bent downward at a bending angle of 90 degrees via the bending line 30a shown in FIG.

  The wiring region 29b in which the lead portion 29b is formed is also deformed downward (Z2 direction shown in FIG. 2) so as to be away from the conductor 40. In the embodiment shown in FIG. 2, the wiring region 31 in which the lead portion 29b is formed is bent downward at a bending angle of 90 degrees via the bending line 31a shown in FIG.

  As shown in FIG. 3, the wiring region 32 in which the lead portion 27 is formed is also deformed downward (Z2 direction shown in FIG. 3) so as to be away from the conductor 40. In the embodiment shown in FIG. 3, the wiring region 32 in which the lead portion 27 is formed is bent downward at a bending angle of 90 degrees via the bending line 32 a shown in FIG. 4.

  In this embodiment, the area surrounded by the fold lines 30a and 31a and the fold line 32a is a planar operation area 34, and the operation area 34 includes the upper surface 11A2 of the upper case 11A and the operation key 12. The key top 12a that is the surface of the mobile phone 10 is opposed to the operation surface of the mobile phone 10 in parallel. Therefore, the bending lines 30a, 31a, and 32a are set at the boundary between the wiring areas 30, 31, and 32 and the operation area 34.

  In the embodiment shown in FIGS. 4 and 5, as shown in FIG. 4, the fold line 30 a extends from the front edge 21 f of the base sheet 21 toward the rear edge 21 g of the Y detection electrodes 1 y, 2 y. , 3y, 4y are formed so as to pass through a boundary portion between the end portion on the side edge 21h side of the base sheet 21 and the lead portion 29a. The folding line 31a extends from the front edge 21f of the base sheet 21 toward the rear edge 21g, and the end of the Y detection electrodes 5y, 6y, 7y, 8y on the other side edge 21i side. It is formed so as to pass through a boundary portion with the drawer portion 29b. Further, as shown in FIG. 4, the fold line 32a extends from the side edge 21h of the base sheet 21 toward the side edge 21i of the X detection electrodes 1x, 2x, 3x, 4x, 5x, 6x. It is formed so as to pass through a boundary portion between the end portion on the rear edge 21 f side and the drawing portion 27.

  In the coordinate detection device 20 shown in FIGS. 2 to 5, the wiring regions 30, 31, 32 in which the lead portions 27, 29 a, 29 b are densely arranged are connected to the conductor 40 from the folding lines 30 a, 31 a, 32 a. And bent downward (the Z2 direction side shown in FIGS. 2 and 3). Therefore, as shown in FIGS. 2 and 3, distances L1, L2, and L5 between the conductor 40 approaching the operation region 34 and the lead portions 27, 29a, and 29b can be increased. Therefore, the electric conductor 40 makes it difficult to induce charges of the plurality of lead portions 27, the plurality of lead portions 29a, or the plurality of lead portions 29b, thereby preventing a coordinate detection malfunction.

  In FIG. 2, a state in which the lead portions 29a and 29b are not bent downward is indicated by a one-dot chain line. Assuming that the base sheet 21 is mounted on the cellular phone 10 without being bent as in a conventional coordinate detection device, the conductor 40 scanning the operation surface and the drawer The distance L3 from the portion 29a and the distance L4 between the conductor 40 and the lead portion 29b are based on the distances L1 and L2 in the case of the coordinate detection device 20 in which the lead portions 29a and 29b are bent downward. Is also shortened. Therefore, the conductor 40 may induce charges in the plurality of lead portions 29a or the plurality of lead portions 29b.

  FIG. 6 shows the conductor 40 above the surface 21e of the base sheet 21 in a conventional coordinate detection apparatus (structure shown by a one-dot chain line in FIG. 2) in a state where the base sheet 21 is not bent. Is a detection curve showing a coordinate detection output when the position is moved from the X1 direction to the X2 direction with the position in the Y coordinate direction fixed. FIG. 7 shows that in the coordinate detection device 20 of the embodiment, from the X1 direction to the X2 direction, the conductor 40 is positioned at a constant position in the Y coordinate direction above the surface 21e of the base sheet 21. It is a detection curve which shows the coordinate detection output when it is moved.

  In the graphs shown in FIGS. 6 and 7, the horizontal axis indicates the detection position of the X coordinate of the conductor 40, and the vertical axis indicates the detection position of the Y coordinate. Also, the left side of the figure corresponds to the side edge 21h side (the wiring area 30 side) of the base sheet 21, and the right side of the figure is the side edge 21i side (the wiring area 31 side) of the base sheet 21. It corresponds to.

  As shown in FIG. 6, in the conventional coordinate detection apparatus, the X coordinate of the detection curve changes on the right side and the left side in the drawing. That is, on the wiring region 30 side on the left side in the drawing and on the wiring region 31 side on the right side in the drawing, the conductor 40 moves to Y while the Y coordinate is kept constant. It will be detected by mistake as if it has moved in the direction.

  This is because the distance L3 between the conductor 40 and the wiring region 30 is small, so that when the conductor 40 approaches the lead portions 29a and 29b, it simultaneously contacts or approaches a plurality of the lead portions 29a. This is because the charge of the lead portion 29a changes, and as a result, the Y detection electrode located at a position away from the conductor 40 causes erroneous detection.

  Therefore, in the coordinate detection device having the conventional structure, the region where the linearity between the actual Y coordinate of the conductor 40 and the detected coordinate position can be taken is a range narrower than the actual operation region 34 as shown in FIG. W1.

  On the other hand, in the coordinate detection apparatus 20, as shown in FIG. 7, the detection curve is constant from the right side to the left side in the figure. The detected coordinates of the conductor 40 are output with the Y coordinate being constant also on the drawing portion 29a side on the left side in the drawing and on the drawing portion 29b side on the right side in the drawing.

  This is because the wiring regions 30, 31 in which the lead portions 29a, 29b are densely arranged are separated from the conductors 40 from the bending lines 30a, 31a (Z2 shown in FIGS. 2 and 3). The distances L1 and L2 between the conductor 40 and the lead portions 29a and 29b can be increased. Accordingly, the conductor 40 does not affect the plurality of lead portions 29a or the plurality of lead portions 29b.

  Therefore, in the coordinate detection device 20, the region where the linearity between the Y coordinate of the conductor 40 and the detected coordinate position can be taken is the same range W <b> 2 as the region of the actual operation region 34.

  In the embodiment shown in FIG. 1, the coordinate detection device 20 is mounted on the mobile phone 10. However, since the mobile phone 10 has been downsized in recent years, the operation unit 11 is also downsized. . Accordingly, the substrate sheet 21 of the coordinate detection device 20 is required to have a small area. However, in the coordinate detection device having the conventional structure, since the proportion of the area where linearity can be taken (the region where detection with high accuracy can be performed) is small, the conductor 40 is in contact or The approaching operation area is also very narrow.

  On the other hand, when the wiring regions 30 and 31 are formed at positions far away from the operation region, the area of the surface 21e of the base sheet 21 must be increased, and thus the operation region 11 that is reduced in size is mounted. It becomes difficult.

  On the other hand, in the coordinate detection device 20, since the proportion of the area where linearity can be taken (the region where detection with high accuracy can be performed) is large, the conductor 40 contacts even if the area of the base sheet 21 is reduced. Alternatively, the approaching operation area can be widened.

  Therefore, the coordinate detection device 20 can be particularly suitable for mounting on the recent miniaturized mobile phone 10.

  As described above, the effect of the coordinate detection device 20 has been described by taking the wiring regions 30 and 31 and the Y detection electrode 3y as an example, but the other Y detection electrodes 1y, 2y, 4y, 5y, 6y, 7y, The same applies to 8y.

  In addition, the position of the said wiring area | regions 30, 31, and 32 formed in the base material sheet 21 is not limited. 4 and 5, the lead portions 27 and 28 are formed in the wiring region 32. However, the lead portions 27 and 28 may be formed in different wiring regions. .

  Further, in the embodiment shown in FIGS. 4 and 5, all of the three lead portions 27, 29 a, 29 b are bent in a direction away from the conductor 40, but of the three lead portions 27, 29 a, 29 b If at least one is bent, a region where detection with high accuracy can be performed can be enlarged.

  In the coordinate detection device 20 of the present invention, the bending angle is not limited, and the bending angle may be configured to be less than 90 degrees or greater than 90 degrees. However, it is preferable that the bending angle is 90 degrees because the distances L1, L2, and L5 between the conductor 40 and the lead portions 27, 29a, and 29b can be increased.

  In the embodiment shown in FIGS. 2 and 3, the wiring regions 30, 31, and 32 having the lead portions 27, 29a, and 29b are directed downward through the folding lines 30a, 31a, and 32a, respectively. Although it is bent, the present invention is not limited to this. For example, the wiring regions 30, 31, 32 having the lead portions 27, 29a, 29b are configured to be curved downward. Also good.

  In the above description, the mobile phone 10 has been described as an example of the information terminal device. However, the coordinate detection device 20 of the present invention is mounted on an information terminal device other than the mobile phone 10 such as a personal computer. There may be.

  As described above, the coordinate detection device 20 can increase the area of a detection region that can be detected with high accuracy as compared with a coordinate detection device having a conventional structure. It is possible to increase the mounting efficiency of the mobile phone, and it is particularly suitable for mounting on the miniaturized mobile phone 10.

The top view which shows the mobile telephone as an information terminal device by which the coordinate detection apparatus of this invention is mounted, II-II line sectional view of FIG. III-III line sectional view of FIG. The top view which shows the base material sheet which comprises the coordinate detection apparatus which is embodiment of this invention, and an electrode pattern from the back surface, A perspective plan view showing a state in which the electrode pattern of the Y detection electrode formed on the surface of the base sheet of FIG. 4 is viewed from the back surface; A graph showing a detection curve of a conventional coordinate detection device; The graph which shows the detection curve of the coordinate detection apparatus of this invention shown in FIG. The top view which shows the base material sheet which comprises the conventional coordinate detection apparatus, and an electrode pattern from the back surface,

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mobile phone 11 Operation part 11A2 Upper surface 12 Operation key 12a Key top 13 Circuit board 15 Electronic component 20 Coordinate detection device 21 Base material 21d Back surface 21e Front surface 21f Front edge 21g Rear edge 21h One side edge 21i The other side edge 27, 28, 29a, 29b Lead-out portion 30, 31, 32 Wiring area 30a, 31a, 32a Bending line 34 Operation area 40 Conductor K, 1k, 2k, 3k, 4k, 5k Common electrode 1k1-1k8 Provided on common electrode 1k and Common counter electrode 2k1-2k8 extending in the X direction Common counter electrode 3k1-3k8 provided in the common electrode 2k and extending in the X direction Common counter electrode 4k1-4k8 provided in the common electrode 3k and extending in the X direction 4k1-4k8 And common counter electrode 5k1 extending in the X direction 5k8 Common counter electrode provided on the common electrode 5k and extending in the X direction 1ka to 1kd Common counter electrode provided on the common electrode 1k and extending in the Y direction 5ka to 5kd Common counter electrode provided on the common electrode 5k and extending in the Y direction 1x , 2x, 3x, 4x, 5x, 6x X detection electrodes (electrodes extending in the Y direction)
1y, 2y, 3y, 4y, 5y, 6y, 7y, 8y Y detection electrode (electrode extending in the X direction)

Claims (4)

A substrate formed of an insulating material and having an operation-side surface that contacts or approaches the conductor and a back surface opposite to the operation surface; and a plurality of detection electrodes that are positioned on the front surface or the back surface and extend in parallel in one direction A common electrode positioned on the front surface or the back surface and spaced from the detection electrode, and when a conductor contacts or approaches the surface, the detection electrode and the common electrode In the coordinate detection device in which the capacitance between the
The substrate has a wiring region in which a lead portion continuous with the detection electrode is located, and in the wiring region, the lead portion extends in a direction intersecting with a direction in which the detection electrode extends,
The coordinate detection apparatus, wherein the substrate is deformed so that the lead portion is separated from the conductor contacting the surface. The detection electrode has an X detection electrode provided on one surface of the front surface and the back surface of the substrate, and a Y detection electrode provided on the other surface and extending perpendicularly to the X detection electrode,
The substrate has a wiring region in which the lead portion continuous with the X detection electrode is located, and a wiring region in which the lead portion continuous with the Y detection electrode is located, and at least one lead portion has The coordinate detection apparatus according to claim 1, wherein the substrate is deformed so as to be separated from the conductor.   The substrate is a flexible substrate, and the substrate has a planar operation region where the detection electrode and the common electrode are located, and the wiring region, and a boundary between the operation region and the wiring region The coordinate detection apparatus according to claim 1, wherein the flexible substrate is bent through a bending line set in a part.   The coordinate detection apparatus according to claim 3, wherein a bending angle of the wiring area with respect to the operation area is 90 degrees.

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