Abstract:
A position detection apparatus includes: a sensor substrate having a detection region in which position detecting electrodes are formed and a wiring line region in which wiring lines led out from the position detecting electrodes are disposed; a processing circuit connected to the wiring lines of the sensor substrate and configured to carry out a predetermined signal process based on a signal from the sensor substrate; and a housing having the sensor substrate placed thereon and having the processing circuit provided therein; the sensor substrate placed on the housing having a through-hole provided therein in the proximity of the detection region for allowing the wiring lines to be threaded therethrough.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims the benefit under 35 U.S.C. §119(a) of Japanese Patent Application No. 2009-218230, filed, Sep. 21, 2009, the entire content of which is incorporated by reference herein. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a position detection apparatus which carries out position detection based on capacitance. 
     2. Description of the Related Art 
     A position detection apparatus is conventionally known wherein an inputting unit including a first detector utilizing capacitance and a second detector utilizing electromagnetic induction disposed in a superposed relationship with each other is fitted in an opening of a case. A position detection apparatus of the type described is disclosed, for example, in Japanese Patent Laid-Open No. 2009-162538 (pages 4 to 8 and FIGS. 1 to 11) (hereinafter referred to as Patent Document 1). In the position detection apparatus of the type described, the first detector detects the position pointed to using the human body such as a finger. Meanwhile, the second detector detects the position pointed to using a position pointer of the pen type in which a resonance circuit formed from a coil and a capacitor is built in. 
     SUMMARY OF THE INVENTION 
     Since the position detection apparatus disclosed in Patent Document 1 is structured such that the detectors are fitted in the opening of the case, it is necessary to lead out wiring lines for electrically connecting the first detector positioned closely to the surface of the position detection apparatus and a processing circuit to each other on the rear side of the position detection apparatus. Therefore, the position detection apparatus has problems that time is required to lead out the wiring lines and that the structure of the connecting portions of the wiring lines is complicated. For example, since side walls for defining the opening of the case are provided around the first detector, the wiring lines cannot be laid as they are in a horizontal direction. Therefore, lead wires are led out from the rear side of the first detector as shown in the FIG. 6 of Patent Document 1. However, since the second detector is disposed below the first detector, the lead wires must be devised so as not to interfere with the second detector. Consequently, a working step of leading out the wiring lines is required. Further, if it is tried to increase the area of the detection region of the first detector, then the structure around the connecting portions becomes complicated. 
     Further, in the position detection apparatus disclosed in Patent Document 1, a cover is disposed in an overlapping relationship on the first detector positioned closely to the surface of the position detection apparatus. Usually, the cover is adhered to the surface of the first detector using a bonding agent. Thus, there is a problem that air bubbles may possibly enter a gap between the first detector and the cover when the cover is adhered. The air bubbles once entering the gap cannot be removed after the adhesion therearound ends. Besides, where such air bubbles enter, the distance between the surface of the first detector and the human body varies depending upon the presence or absence of air bubbles, and this gives rise to deterioration of the accuracy in position detection. Further, if convexes and concaves are formed on the cover depending upon the presence or absence of air bubbles, then the user would have a sense of incongruity when touching the surface of the cover, which is not favorable. 
     The present invention has been made in view of the above circumstances, to provide a position detection apparatus wherein the labor and time for wiring for a detector positioned closely to the surface of the position detection apparatus can be reduced and the structure relating to wiring lines can be simplified. 
     According to another aspect of the present invention, a position detection apparatus is provided wherein air bubbles can be prevented from entering the surface of a detector. 
     According to one embodiment of the present invention, there is provided a position detection apparatus including a sensor substrate having a detection region in which position detecting electrodes are formed and a wiring line region in which wiring lines led out from the position detecting electrodes are disposed, a processing circuit connected to the wiring lines of the sensor substrate and configured to carry out a predetermined signal process based on a signal from the sensor substrate, and a housing having the sensor substrate placed thereon and having the processing circuit provided therein, the sensor substrate placed on the housing having a through-hole provided therein in the proximity of the detection region for allowing the wiring lines to be threaded therethrough. 
     With the position detection apparatus, wiring is carried out by threading the wiring line region of the flexible sensor substrate through the through-hole provided in the housing. Therefore, the necessity for a structure for leading out signal lines which is prepared separately for wiring and the labor for connecting the signal lines is eliminated. 
     The position detection apparatus may further include a magnetic flux detecting substrate provided at a position of the housing opposing the sensor substrate and having one or more loop coils formed thereon for detecting magnetic fluxes generated by a coil provided in a position pointer. 
     With the position detection apparatus, the overall surface of the sensor substrate provided on the housing can be used as a region for use (effective region) with the position pointer. 
     The position detection apparatus may be configured such that the wiring line region of the sensor substrate includes a neighboring wiring line region neighboring with a periphery of the detection region and having the wiring lines connected to the position detecting electrodes, and a lead wiring line region having wiring lines used for connection between the wiring lines in the neighboring wiring line region and the processing circuit, the lead wiring line region extending from the neighboring wiring line region in such a manner as to extend through the through-hole. 
     With the position detection apparatus, a substantially overall area of the sensor substrate can be utilized effectively. 
     Preferably, at least the lead wiring line region of the sensor substrate is formed from a flexible substrate. 
     Preferably, a recessed portion is formed at a position of an outer periphery of the sensor substrate which neighbors with the lead wiring line region. 
     Preferably, the position detection apparatus further include a sheet member having an area greater than the total area of the detection region and the neighboring wiring line region and disposed so as to cover the surface of the sensor substrate, and a support member disposed at a position at which the support member is shielded from the outside by the sheet member and having a thickness equal to that of the sensor substrate. 
     With the position detection apparatus, an end portion of the sheet member disposed on the surface can be prevented from being bent toward the gap between the sensor substrate and the side wall of an accommodation unit (to be described below) at a position corresponding to the gap. 
     Preferably, the position detection apparatus further includes an accommodation unit of a substantially concave shape provided on an upper face of the housing and having at least a bottom face for attaching the sensor substrate thereto, the through-hole being provided in the accommodation unit. 
     Preferably, the position detection apparatus further includes a sheet member disposed so as to cover the surface of the sensor substrate, the through-hole being formed at a position on the inner side with respect to a side wall of the accommodation unit at which the through-hole is shielded from the outside by the sheet member. 
     With the position detection apparatus, the internal structure can be prevented from being observed through the through-hole through a small gap formed around the sheet member on the surface. 
     The position detection apparatus may be configured such that a bonding agent for adhering the sensor substrate and a different member is provided in a region of at least one of the surface and the rear surface of the sensor substrate, the region being opposed to the position detecting electrodes. The position detection apparatus may be configured further that grooves formed by the provision of the bonding agent at the position opposing the position detecting electrodes are formed in such a manner as to be communicated at least one of the opposite ends thereof with an outer peripheral portion of the sensor substrate. 
     With the position detection apparatus, air bubbles entering the region in which the bonding agent is provided can be removed through the grooves. Consequently, deterioration of the accuracy in position detection can be prevented and a sense of incongruity which the user may experience can be eliminated. 
     The grooves may be formed in a checked pattern. 
     With the position detection apparatus, air bubbles entering the region in which the bonding agent is provided can escape over the overall area of the sensor substrate, and even if the groove is partly closed up with a foreign article or the like, a bypass path can be readily assured along which an air bubble can escape. 
     Preferably, where the bonding agent is provided on both of the surface and the rear surface of the sensor substrate, the grooves formed on the surface and the grooves formed on the rear surface are formed at positions at which the grooves do not overlap with each other except at positions at which the grooves intersect with each other. 
     With the position detection apparatus, where two layers of the bonding agent are provided, since the grooves do not overlap with each other, when a position corresponding to the groove is pointed to (or touched), the portion pointed to can be prevented from being deformed by a great amount. 
     The above and other objects, features and advantages of the present invention will become apparent from the following description and the appended claims, taken in conjunction with the accompanying drawings in which like parts or elements denoted by like reference symbols. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a plan view of a position detection apparatus according to an embodiment of the present invention; 
         FIG. 2  is an enlarged sectional view taken along line II-II of  FIG. 1 ; 
         FIG. 3  is a schematic view illustrating operation of the position detection apparatus; 
         FIG. 4  is a plan view showing an entire sensor substrate of the position detection apparatus; 
         FIG. 5  is a partial plan view showing part of the sensor substrate in an enlarged scale; 
         FIG. 6  is a plan view of a housing of the position detection apparatus showing details of through-holes; 
         FIG. 7  is a block diagram illustrating position detection operation of the position detection apparatus using a magnetic flux detecting substrate; 
         FIG. 8  is a sectional view showing a modification to the position detection apparatus; 
         FIG. 9  is a schematic view showing adhering faces on both surfaces of the sensor substrate; 
         FIG. 10  is a partial enlarged view of the sensor substrate; and 
         FIG. 11  is a sectional view taken along line XI-XI of  FIG. 10 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A position detection apparatus according to an embodiment of the present invention is described below with reference to the drawings. 
       FIG. 1  shows the position detection apparatus of the present embodiment and  FIG. 2  shows a cross section taken along line II-II of  FIG. 1 . Referring to  FIGS. 1 and 2 , the position detection apparatus  100  of the present embodiment is used to detect a position pointed to by part of the human body such as, for example, a fingertip, or by a position pointer  200  as seen in  FIG. 3 . The position detection apparatus  100  includes a sensor substrate  110  as a first detector for carrying out position detection using a capacitance system, a magnetic flux detecting substrate  120  as a second detector for carrying out position detection using electromagnetic induction, a sheet member  130  for covering the surface of the sensor substrate  110 , a housing  140  having an accommodation unit  144  for accommodating the sensor substrate  110 , magnetic flux detecting substrate  120  and sheet member  130 , and such various circuits necessary for position detection as shown in  FIG. 3 . The position detection apparatus  100  is connected to an external apparatus not shown such as a personal computer or a PDA (Personal Digital Assistant) and is used as an inputting apparatus for the external apparatus. If the surface of the sheet member  130  is pointed to by a fingertip or a position pointer, then coordinate data of the position pointed to is outputted from the position detection apparatus  100  to the external apparatus. It is to be noted that, in the cross section shown in  FIG. 2 , in order to facilitate easy recognition and understanding, a gap is shown provided between the sheet member  130  and the sensor substrate  110  and between the sensor substrate  110  and the accommodation unit  144 . Actually, however, the sheet member  130 , sensor substrate  110  and accommodation unit  144  are adhered to each other by a bonding agent to assure a uniformly closely contacting state among them. 
       FIG. 3  illustrates operation of the position detection apparatus  100 . Referring now to  FIG. 3 , the position detection apparatus  100  includes, as the circuits for carrying out position detection, a capacitance measuring unit  150 , an electromagnetic induction detector  152  and a processing circuit  154 . 
     The capacitance measuring unit  150  measures the variation of the capacitance of a detection electrode provided on the sensor substrate  110  and is connected between the sensor substrate  110  and the processing circuit  154 . The electromagnetic induction detector  152  detects the position of a point pointed to by a position pointer  200  utilizing electromagnetic induction and is connected between the magnetic flux detecting substrate  120  and the processing circuit  154 . The processing circuit  154  calculates coordinate data of a point pointed to by a fingertip or the position pointer  200 , which is detected using the sensor substrate  110  or the magnetic flux detecting substrate  120 . The coordinate data calculated by the processing circuit  154  is sent to the external apparatus. 
     Now, details of the sensor substrate  110  are described.  FIG. 4  shows the entire sensor substrate  110  in a plan view and  FIG. 5  shows part of the sensor substrate  110  in an enlarged scale. 
     The sensor substrate  110  is a flexible substrate in the form of a film substrate having flexibility, and, in the present embodiment, a PET (Polyethylene Terephthalate) substrate is used as the sensor substrate  110 . It is to be noted that a film substrate other than a PET substrate such as, for example, a polyimide substrate may be used instead. The sensor substrate  110  includes a detection region  112  in which a plurality of detecting electrodes  112 A and  112 B are formed, and a wiring line region  114  in which wiring lines led out from the detecting electrodes  112 A and  112 B are laid. 
     The detecting electrodes  112 A have a substantially square shape and are disposed regularly over an overall area of the detection region  112  such that one of a pair of diagonal lines thereof each extends along an X direction, which is a direction of the long side of the detection region  112  having a rectangular shape while the direction of the short side of the detection region  112  is defined as a Y direction. Those of the detecting electrodes  112 A which are positioned adjacent to each other along the X direction are electrically connected to each other by an auxiliary line  112 C, and a plurality of detection electrode groups each including such a plurality of detecting electrodes  112 A connected in a row in the X direction by the auxiliary lines  112 C are disposed along the Y direction. 
     Meanwhile, the detecting electrodes  112 B have a substantially square shape similarly to the detecting electrodes  112 A and are disposed regularly over an overall area of the detection region  112  such that one of a pair of diagonal lines thereof each extends along the Y direction. Those of the detecting electrodes  112 B which are positioned adjacent to each other along the Y direction are electrically connected to each other by an auxiliary line  112 D, and a plurality of detection electrode groups each including such a plurality of detecting electrodes  112 B connected in a row in the Y direction by the auxiliary lines  112 D are disposed along the X direction. 
     The detecting electrodes  112 A and the detecting electrodes  112 B are disposed regularly in the detection region  112  such that they individually fill gaps defined by the other ones of them. When a fingertip of a user touches the surface of the sheet member  130 , the touching face of the fingertip opposes both of a detecting electrode  112 A and a detecting electrode  112 B simultaneously. It is to be noted that, although the auxiliary lines  112 C and  112 D intersect with each other, they are electrically isolated from each other. For example, the electric isolation between the auxiliary lines  112 C and  112 D is achieved by using the sensor substrate  110  which has two or more metal layers. Further, the detecting electrodes  112 A and  112 B have slits  112 E formed at positions along the other diagonal lines for reducing eddy current produced by magnetic fluxes generated by the magnetic flux detecting substrate  120  or the position pointer  200 . The shape of the slits  112 E shown in  FIG. 5  is an example, and the shape and the number of such slits  112 E can be changed suitably. 
     The capacitance measuring unit  150  detects the variation of the capacitance of the detection electrode groups in the X direction formed from the plural detecting electrodes  112 A in a unit of a group and detects the variation of the capacitance of the detection electrode groups in the Y direction formed from the plural detecting electrodes  112 B in a unit of a group. The processing circuit  154  specifies detection electrode groups in the X direction and the Y direction whose capacitance indicates some increase in response to approaching of a fingertip, to thereby calculate the position pointed to by the fingertip. 
     The wiring line region  114  includes a neighboring wiring line region  114 A in which wiring lines connected to the detecting electrodes  112 A and  112 B are included and lead wiring line regions  114 B used for connection between the wiring lines included in the neighboring wiring line region  114 A and the processing circuit  154  side, that is, the capacitance measuring unit  150 . The neighboring wiring line region  114 A and the lead wiring line regions  114 B are disposed adjacent to the periphery of the detection region  112 . In  FIG. 4 , the wiring line region  114  is indicated by slanting lines. However, the directions of the slanting lines in the neighboring wiring line region  114 A and the lead wiring line region  114 B are different from each other. 
     The region including both the detection region  112  and the wiring line region  114  has a rectangular shape, and one or a plurality of lead wiring line regions  114 B extend outwardly from a peripheral edge or edges of the rectangular shape. In the example shown in  FIG. 4 , three lead wiring line regions  114 B extend outwardly from two sides of the rectangular shape. Further, a pair of cutaway portions  114 C of a concave shape are provided adjacent to each of the lead wiring line regions  114 B on the outer periphery of the neighboring wiring line region  114 A. 
     Connection between the sensor substrate  110  and the capacitance measuring unit  150  is established using the lead wiring line regions  114 B. In particular, electric connection between the sensor substrate  110  and the capacitance measuring unit  150  is established by bending part of the wiring line region  114 , particularly a root portion of each of the lead wiring line regions  114 B, to deform or bend and draw the lead wiring line region  114 B in the housing  140 . 
     To this end, three through-holes  142  are formed at positions in the housing  140  corresponding to the positions at which the lead wiring line regions  114 B are provided.  FIG. 6  shows a plan view of the housing  140  showing details of the through-holes. Referring to  FIG. 6 , the housing  140  has the accommodation unit  144  formed from a recessed portion of a rectangular shape at a position thereof corresponding to the sensor substrate  110  and the sheet member  130 . As seen in  FIG. 2 , the depth of the accommodation unit  144  is set such that, when the sensor substrate  110  and the sheet member  130  are accommodated in the accommodation unit  144 , the surface of the sheet member  130  is positioned at substantially the same height as the surface of the housing  140  around the accommodation unit  144 . The three through-holes  142  are formed in the proximity of a periphery of the bottom face, that is, in the proximity of a side wall, of the accommodation unit  144 . The through-holes  142  are formed on the inner side with respect to the side wall of the accommodation unit  144 . By forming the through-holes  142  at such positions as described above, the entire through-holes  142  can be covered with the sheet member  130 . 
     The lead wiring line regions  114 B are bent at the root portion thereof, and the bent portions thereof are threaded through the through-holes  142  as seen in  FIG. 2  and are connected at an end portion thereof to the capacitance measuring unit  150 . 
     Now, position detection carried out using the magnetic flux detecting substrate  120  is described.  FIG. 7  illustrates position detection operation carried out using the magnetic flux detecting substrate  120 . Referring to  FIG. 7 , the magnetic flux detecting substrate  120  is provided at a position of the surface or the rear face of the housing  140  opposing the sensor substrate  110 . In the arrangement shown in  FIG. 2 , the magnetic flux detecting substrate  120  is disposed on the rear face side of the housing  140 . However, the magnetic flux detecting substrate  120  may otherwise be disposed in a region of the surface of the housing  140  defined by the housing  140  and the sensor substrate  110 . 
     The magnetic flux detecting substrate  120  includes a plurality of, for example, 40, loop coils in each of the X and Y directions which coincide with the X and Y directions of the sensor substrate  110  shown in  FIG. 4 , respectively. 
     The electromagnetic induction detector  152  includes a selection circuit  300 , a transmission/reception changeover circuit  302 , an amplifier  304 , a detector circuit  306 , a low-pass filter (LPF)  308 , a sample hold circuit (S/H)  310 , an analog to digital converter (A/D)  312 , a CPU (Central Process Unit)  314 , an oscillator  316  and a driver  318 . The selection circuit  300  selects one of the loop coils provided on the magnetic flux detecting substrate  120  and connects the selected loop coil to the transmission/reception changeover circuit  302 . In a state wherein the transmission/reception changeover circuit  302  is changed over to the transmission side (T), the loop coil selected by the selection circuit  300  and the driver  318  are in a connected state to each other, and if an AC signal of a predetermined frequency is outputted from the oscillator  316 , then the driver  318  supplies current to the loop coil connected thereto so that a magnetic field is generated from the loop coil. 
     A resonance circuit including a coil and a capacitor connected in parallel is built in the position pointer  200 . If the position pointer  200  is positioned in the proximity of the surface of the position detection apparatus  100  in a state wherein magnetic fluxes are generated from the loop coil, then a voltage induced in the coil in the position pointer  200  is applied to the capacitor so that charge is accumulated in the capacitor. Thereafter, if the transmission/reception changeover circuit  302  is changed over to the reception side (R), then the generation of a magnetic field from the loop coil is stopped and the charge accumulated in the capacitor till then is discharged from the position pointer  200  so that current flows through the coil. Consequently, a magnetic field is generated from the coil. If, in this state, the loop coil selected by the selection circuit  300  is changed over, then the position of the position pointer  200  is specified by detecting the intensity of a signal outputted from each loop coil. In particular, the detection of the signal intensity is carried out by carrying out a detection process, for example, an AM detection process by means of the detector circuit  306  for a signal amplified by the amplifier  304 , converting the detected signal that has passed through the LPF  308  into digital data using the sample hold circuit  310  and the analog to digital converter  312 , and then processing the digital data by means of the CPU  314 . 
     In this manner, in the position detection apparatus  100  of the present embodiment, since wiring for the wiring line region  114  of the sensor substrate  110  having flexibility is carried out by threading wiring lines into the through-holes  142  provided in the accommodation unit  144  of the housing  140 , the necessity for a structure for leading out signal lines which is prepared separately for wiring and the labor for connecting the signal lines is eliminated. Particularly, where the sensor substrate  110  and the magnetic flux detecting substrate  120  are used in combination, the overall surface of the sensor substrate  110  accommodated in the accommodation unit  144  of the housing  140  can be used as an effective area for the position pointer  200 . 
     Further, since the wiring line region  114  includes the neighboring wiring line region  114 A and the lead wiring line regions  114 B and the lead wiring line regions  114 B extending from the neighboring wiring line region  114 A are threaded through the through-holes  142 , a substantially overall area of the sensor substrate  110 , that is, a region corresponding to the detection region  112  and the neighboring wiring line region  114 A, can be utilized effectively. 
     Further, since the cutaway portions  114 C are provided at positions of an outer periphery of the neighboring wiring line region  114 A adjacent to the lead wiring line regions  114 B, the lead wiring line regions  114 B can be prevented from projecting to the outer sides of the region including the detection region  112  and the neighboring wiring line region  114 A. 
     Further, since the sheet member  130  is provided such that it is disposed so as to cover the surface of the sensor substrate  110  and the through-holes  142  are formed at positions on the inner side with respect to the side wall of the accommodation unit  144  at which the through-holes  142  are shielded from the outside by the sheet member  130 , the internal structure can be prevented from being observed through the through-holes  142  through a small gap formed around the sheet member  130  on the surface. 
     It is to be noted that, where the sheet member  130  has an area greater than that of the region which includes both of the detection region  112  and the neighboring wiring line region  114 A of the sensor substrate  110 , a support member  132  may be provided such that it is disposed at a position shielded from the outside by the sheet member  130  and has a thickness equal to that of the sensor substrate  110  as seen in  FIG. 8 . By the support member  132 , an end portion of the sheet member  130  disposed on the surface can be prevented from being bent toward the gap between the sensor substrate  110  and the side wall of the accommodation unit  144  at a position corresponding to the gap. 
     Incidentally, a bonding agent is applied to the surface and the rear face of the flexible sensor substrate  110  to adhere the sensor substrate  110  and another member, that is, the sheet member  130  and housing  140 , to each other. 
       FIG. 9  shows the adhering faces formed by applying the bonding agent to both of the opposite surfaces (front and rear) of the sensor substrate  110 . Meanwhile,  FIG. 10  shows part of the sensor substrate  110  in an enlarged scale and  FIG. 11  shows a cross section taken along line XI-XI of  FIG. 10 . Referring to  FIGS. 9 to 11 , the sensor substrate  110  has an adhering face  400  formed by applying the bonding agent to the surface thereof and another adhering face  410  formed by applying the bonding agent to the rear face thereof. 
     On the adhering face  400  on the surface side, a plurality of grooves  402  are formed in a spaced relationship by a predetermined distance from each other and extend in a direction inclined by 45 degrees with respect to the X direction. Further, a plurality of grooves  404  are formed in a spaced relationship by a predetermined distance from each other and extend in a direction inclined by 135 degrees with respect to the X direction. The grooves  402  and  404  are formed in a checked pattern on the adhering face  400  such that they are communicated with an outer periphery of the sensor substrate  110 . In other words, the adhering face  400  is provided in regions each opposing a total of four detecting electrodes  112 A and  112 B, and the check-patterned grooves  402  and  404  described above are formed in a region in which the adhering face  400  does not oppose the detecting electrodes  112 A and  112 B. Further, the adhering face  400  opposing the detecting electrodes  112 A and  112 B has a uniform thickness. 
     Similarly, on the adhering face  410  on the rear face side, a plurality of grooves  412  are formed in a spaced relationship by a predetermined distance from each other and extend in a direction inclined by 45 degrees with respect to the X direction, and a plurality of grooves  414  are formed in a spaced relationship by a predetermined distance from each other and extend in a direction inclined by 135 degrees with respect to the X direction. The grooves  412  and  414  are formed in a checked pattern on the adhering face  410  such that they are communicated with an outer periphery of the sensor substrate  110 . In other words, the adhering face  410  is provided in regions each opposing a total of four detecting electrodes  112 A and  112 B, and the checked-pattern grooves  412  and  414  are provided in a region in which the adhering face  410  does not oppose the detecting electrodes  112 A and  112 B. Further, the adhering face  410  opposing the detecting electrodes  112 A and  112 B has a uniform thickness. 
     Further, the grooves  402  and  404  on the front face side and the grooves  412  and  414  on the rear face side described above are formed at positions displaced from each other by one pitch of the detecting electrodes  112 A and  112 B such that they do not overlap with each other at any other position than the positions at which they intersect with each other. It is to be noted that one of the positions at which the grooves intersect with each other is indicated by reference character P in  FIG. 10 . 
     In this manner, in the position detection apparatus  100  of the present embodiment, air bubbles entering the regions in which the adhering faces  400  and  410  are formed can be removed through the grooves  402 ,  404  and  412 ,  414 , respectively. Consequently, deterioration of the accuracy in position detection can be prevented, and a sense of incongruity which the user may experience can be eliminated. 
     Further, since the grooves  402  and  404  formed on the front face and the grooves  412  and  414  formed on the rear face are formed at positions other than the positions at which they overlap with each other, also where the adhering faces  400  and  410  in the two layers are provided, when a position corresponding to a groove  402 ,  404 ,  412  or  414  is pointed to (or touched), the portion pointed to can be prevented from being deformed by a great amount. Since the grooves  402  and  404  or the grooves  412  and  414  are formed in a checked pattern, air bubbles entering the adhering faces  400  and  410  can escape over the overall area of the sensor substrate  110 , and even if a groove  402  or  404  or a groove  412  or  414  is partly closed up with a foreign article or the like, a bypass path can be readily assured along which an air bubble can escape. 
     It is to be noted that the present invention is not limited to the specific embodiment described above, but may be modified in various manners without departing from the subject matter of the present invention. For example, while, in the example shown in  FIGS. 9 to 11  in the embodiment described hereinabove, the adhering faces  400  and  410  are provided on the opposite faces of the sensor substrate  110 , they may otherwise be provided on only one of the faces of the sensor substrate  110 . Alternatively, in place of providing the adhering face  400  on the front face of the sensor substrate  110  and providing the adhering face  410  on the rear face of the sensor substrate  110 , the adhering face  400  may be provided on the sheet member  130  side or the adhering face  410  may be provided on the accommodation unit  144  side of the housing  140 . 
     Further, while, in the embodiment described hereinabove, the sensor substrate  110  and the magnetic flux detecting substrate  120  are used in combination, the present invention can be applied also in a position detection apparatus which includes only the sensor substrate  110  of the capacitance type. 
     Further, while, in the embodiment described hereinabove, the entire sensor substrate  110  is formed from a flexible film substrate, the body portion of the sensor substrate  110  including the detection region  112  and the neighboring wiring line region  114 A and the lead wiring line region  114 B may be formed from different materials from each other such that only the lead wiring line region  114 B is formed from a flexible material. 
     In summary, according to the present invention, since wiring on the detection region  112  of the flexible sensor substrate  110  is carried out by threading wiring lines into the through-holes  142  formed in the accommodation unit  144  of the housing  140 , the necessity for a structure for leading out signal lines which is prepared separately for wiring and the labor for connecting the signal lines is eliminated. 
     An embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, but includes other examples of modification and examples of application without departing from the spirit of the present invention described in claims.