JP2015069264A - Press detection sensor, touch input device - Google Patents

Abstract

A pressure detection sensor capable of more reliably detecting a pressing force. A pressure detection sensor includes a long piezoelectric sensor, a rectangular plate member, and a mounting member. The piezoelectric sensor 11 has a structure in which a piezoelectric film 110 is sandwiched between detection electrodes 111 and 112 and these are covered with an exterior part 30. The piezoelectric sensor 11 is arranged near one end in the longitudinal direction of the plate member 20 so that the short direction of the plate member 20 and the longitudinal direction of the piezoelectric sensor 11 are parallel to each other. The piezoelectric sensor 11 is mounted on the plate member 20 by the mounting member 30. An adhesive 31 and an adhesive 32 are used for the mounting member 30. A region of the piezoelectric sensor 11 where the piezoelectric film 110 is present is adhered to the plate member 20 by the adhesive 31, and a region where the piezoelectric film 110 is not present is adhered to the plate member 20 by the adhesive 32. [Selection] Figure 2

Description

  The present invention relates to a press detection sensor that detects a pressing force when an operation surface is pushed in, and a touch input device including the press detection sensor.

  Conventionally, various operation detection sensors for detecting an operation on an operation surface by an operator have been devised. As the operation detection sensor, there are a capacitance method, a thermal resistance method, a piezoelectric acoustic method, an infrared sensor method, and the like, but when detecting a pressing force on the operation surface, a separate pressure detection sensor is installed. There is a need.

  Patent Document 1 describes a touch input device including a touch panel that is an operation detection sensor and a pressure-sensitive sensor that detects pressing of an operation surface. In the touch-type input device of Patent Document 1, the pressure-sensitive sensor is disposed on the lower surface (surface opposite to the operation surface) of the touch panel and has the same area as the touch panel. Moreover, in the touch-type input device of patent document 1, the protective layer is arrange | positioned at the operation surface side of the touch panel.

  Patent Document 2 describes an operation input device in which matrix-like electrodes are formed on both sides of a plate-like piezoelectric body.

JP-A-5-61592 JP 2006-163618 A

However, in the configuration having the press detection mechanism shown in each of the above-mentioned Patent Documents 1 and 2, the following problems occur.
As a piezoelectric body used for a pressure detection sensor, there is a piezoelectric body that uses a piezoelectric film made of an organic material in the form of a flat film.

  An adhesive is used as one method for mounting the pressure detection sensor including the piezoelectric film on the operation input member. When the adhesive is two-component that cures at room temperature, the mounting process becomes complicated. When the adhesive is thermosetting and one-component, it is necessary to bond with high heat, and the heat at the time of bonding is transmitted to the piezoelectric film, and the piezoelectricity of the piezoelectric film is deteriorated.

  In addition, as one method for mounting the pressure detection sensor including the piezoelectric film on the operation input member, an adhesive is used. The pressure-sensitive adhesive has lower elasticity than the adhesive, and the elasticity becomes lower as the temperature rises. For this reason, even if the operation input member is distorted when the operation input member is pushed in, the adhesive is slipped, the stress on the piezoelectric film is relieved, and the detection sensitivity of the pressing force is deteriorated. End up.

  Accordingly, an object of the present invention is to provide a press detection sensor including a piezoelectric film that can be reliably attached to an operation input member and can detect a pressing force more reliably.

  The present invention relates to an operation input member whose one main surface is an operation surface and is distorted by pressing of the operation surface, a sensor unit having a piezoelectric film attached to the operation input member, an operation input member and a sensor And a mounting member for mounting the mounting portion, and has the following characteristics.

  The sensor portion has a shape in which the piezoelectric film is sandwiched so that the detection conductors are arranged on both main surfaces of the piezoelectric film, and includes an exterior portion whose length in the direction in which distortion occurs is longer than that of the piezoelectric film. The mounting member is a thermosetting adhesive provided in both end regions of the exterior part.

  In this configuration, when the sensor unit is attached (adhered) to the operation input member with the thermosetting adhesive, it is difficult to apply heat to the piezoelectric film. Thereby, deterioration of the piezoelectricity of the piezoelectric film can be suppressed. Further, by using the thermosetting adhesive, the stress due to the distortion generated in the operation input member is efficiently transmitted to the piezoelectric film of the sensor unit. Therefore, the pressing force with respect to the operation input member can be detected with high sensitivity.

  Moreover, in the press detection sensor of this invention, it is preferable that a mounting member is further equipped with the adhesive provided in the area | region pinched | interposed with the adhesive agent of the area | region of the both ends in an exterior part.

  In this configuration, the sensor portion can be attached to the operation input member over substantially the entire surface.

  Moreover, in the press detection sensor of this invention, when seeing a press detection sensor from the direction orthogonal to an operation surface, it is preferable that the piezoelectric film is not arrange | positioned in the area | region with an adhesive agent.

  In this configuration, it is difficult to further apply heat to the piezoelectric film.

  In the press detection sensor of the present invention, the piezoelectric film is polylactic acid stretched at least in a uniaxial direction, and the stretching direction is approximately 45 ° with respect to the direction connecting the both ends to which the adhesive of the exterior part is attached. It is preferable to be sandwiched between the exterior parts.

  With this configuration, it is possible to detect the pressing force with higher sensitivity.

  Moreover, in the press detection sensor of this invention, it is preferable that it is the following structure. The operation input member is a rectangle whose operation surface has a longitudinal direction and a short direction. The piezoelectric film and the exterior part constituting the sensor part have a long shape having a long direction and a short direction. The sensor unit is mounted near one end in the longitudinal direction of the operation input member so that the long direction is substantially parallel to the short direction of the operation input member.

  In this configuration, the piezoelectric film is disposed at a position where a large strain is generated in the operation input member when the operation surface is pressed. Further, the piezoelectric film is arranged so that the amount of generated charge is increased when stress is applied to the piezoelectric film. Thereby, it is possible to detect the pressing force with higher sensitivity.

  A touch input device according to the present invention includes the above-described press detection sensor and a position detection touch panel disposed on the back side of the operation input member.

  With this configuration, the pressing force and the operation position can be detected. At this time, the pressing force can be detected with high sensitivity by using the above-described pressing detection sensor.

  According to this invention, the pressing detection sensor can be reliably mounted on the operation input member, and the pressing force on the operation surface can be detected with high sensitivity.

It is the top view and side sectional view of a press detection sensor concerning a 1st embodiment of the present invention. It is each 1st sectional view of the part with which the sensor part of the press detection sensor concerning a 1st embodiment of the present invention was equipped. It is a disassembled perspective view for demonstrating the structure of the piezoelectric sensor which concerns on the 1st Embodiment of this invention. It is a figure which shows the mode of the propagation | transmission of the distortion which arose in the board member. It is a top view which shows the structure of the touch-type input device which concerns on the 2nd Embodiment of this invention. It is a disassembled perspective view for demonstrating the structure of the piezoelectric sensor used for the touch-type input device which concerns on the 2nd Embodiment of this invention.

  A press detection sensor according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view and a side sectional view of a pressure detection sensor according to a first embodiment of the present invention. FIG. 1 shows an AA sectional view and a BB sectional view shown in a plan view. FIG. 2 is a cross-sectional view (enlarged view) of a portion where the sensor portion of the press detection sensor according to the first embodiment of the present invention is mounted. FIG. 3 is an exploded perspective view for explaining the structure of the piezoelectric sensor according to the first embodiment of the present invention. In these drawings, the dimension in the thickness direction is emphasized for easy understanding.

  As shown in FIGS. 1 and 2, the pressure detection sensor 1 includes a piezoelectric sensor 11 corresponding to a “sensor portion” of the present invention, a plate member 20 corresponding to an “operation input member” of the present invention, and a mounting member 30. Is provided. The piezoelectric sensor 11 includes a piezoelectric film 110, detection electrodes 111 and 112, and an exterior part 130.

  The piezoelectric film 110 is made of polylactic acid (PLA), more specifically L-type polylactic acid (PLLA), and has a width (length in the long direction) LLp and a width (length in the short direction) LSp. Consists of a short long flat membrane. The orientation direction of the molecules of the piezoelectric film 110 is approximately 45 ° with respect to the long and short directions of the piezoelectric film 110. In other words, the uniaxial stretching direction 900 of the piezoelectric film 110 forms approximately 45 ° with respect to the long direction and the short direction of the piezoelectric film 110.

Here, the characteristics of PLLA forming the piezoelectric film 110 will be described.
PLLA consists of a chiral polymer. PLLA has a helical structure in the main chain. In PLLA, molecules are oriented in a uniaxially stretched direction, and have piezoelectricity due to the orientation of the molecules. Then, the uniaxially stretched PLLA generates charges due to distortion. Here, the strain generated in PLLA specifically means that piezoelectric film 110 made of PLLA extends in a predetermined direction. At this time, the amount of generated charge is determined by the strain amount of PLLA, that is, the extension amount of the piezoelectric film 110. The piezoelectric constant of uniaxially stretched PLLA belongs to a very high class among polymers.

  The stretching ratio of the piezoelectric film 110 is preferably about 3 to 8 times. By performing a heat treatment after stretching, crystallization of the extended chain crystal of polylactic acid is promoted and the piezoelectric constant is improved. In the case of biaxial stretching, the same effect as that of uniaxial stretching can be obtained by varying the stretching ratio of each axis. For example, when a certain direction is taken as an X-axis, 8 times in that direction, and 2 times in the Y-axis direction perpendicular to that axis, the piezoelectric constant is about 4 times in the X-axis direction, Almost the same effect can be obtained. A film that is simply uniaxially stretched easily tears along the direction of the stretch axis, and thus the strength can be increased somewhat by performing biaxial stretching as described above. Even such a biaxially stretched film corresponds to the stretched film in at least the uniaxial direction of the present invention if the stretch in the uniaxial direction is larger than the stretch in the other direction.

  In addition, PLLA generates piezoelectricity by molecular orientation processing such as stretching, and therefore, it is not necessary to perform poling processing unlike other polymers such as PVDF and piezoelectric ceramics. That is, the piezoelectricity of PLLA that does not belong to ferroelectrics is not expressed by the polarization of ions like ferroelectrics such as PVDF and PZT, but is derived from a helical structure that is a characteristic structure of molecules. is there. For this reason, the pyroelectricity generated in other ferroelectric piezoelectric materials does not occur in PLLA. That is, even if the temperature sensed by the piezoelectric sensor 11 changes, the piezoelectricity does not change, and the generated charge amount corresponding to the magnitude of strain does not change. Further, PVDF or the like shows a change in piezoelectric constant over time, and in some cases, the piezoelectric constant may be significantly reduced, but the piezoelectric constant of PLLA is extremely stable over time. Therefore, the generated charge amount is not affected by the surrounding environment.

  The detection electrode 121 is disposed so as to be in contact with substantially the entire surface of one main surface (flat plate surface) of the piezoelectric film 110. The detection electrode 122 is disposed so as to be in contact with substantially the entire other main surface (flat plate surface) of the piezoelectric film 110. The detection electrodes 121 and 122 are formed on the exterior portion 130. The detection electrode 121 is connected to the routing electrode 1211 formed on the first member 131, and the detection electrode 122 is connected to the routing electrode 1221 formed on the second member 132. The detection electrodes 121 and 122 are connected to an external detection circuit by the routing electrodes 1211 and 1221.

  The exterior part 130 is made of an insulating resin film having heat resistance. For example, the exterior part 130 is made of polyimide. In general, this is often used as an FPC, and a metal such as copper (Cu) is usually used for the electrode, and gold (Au) plating is often applied. The exterior portion 130 may use a general-purpose resin film such as PET. In this case, the electrode is generally printed with a silver (Au) paste or the like. Of course, as the electrode, an inorganic transparent electrode such as ITO or ZnO, or an organic transparent electrode whose main component is polythiophene, aniline or the like can be used. A carbon-based electrode may also be used.

  As shown in FIG. 3, the exterior part 130 has a length LLsn in the longitudinal direction longer than a length LLp in the longitudinal direction of the piezoelectric film 110, and a length in the short direction in the short direction of the piezoelectric film 110. It is a rectangle that is approximately twice as long as the length LSp. The length in the short direction of the exterior part 130 is approximately twice the length LSp in the short direction of the piezoelectric film 110, but is longer than twice the length LSp in the short direction of the piezoelectric film 110.

  The exterior part 130 includes a first member 131 and a second member 132 that are continuous in the lateral direction. The first member 131 and the second member 132 have substantially the same long shape, the length in the longitudinal direction is the length of the exterior portion 130, and the length in the short direction is approximately ½ of the exterior portion 130. is there.

  A detection electrode 121 is formed on one surface of the first member 131 of the exterior part 130, and a detection electrode 122 is formed on one main surface of the second member 132 of the exterior part 130. At this time, the longitudinal direction of the detection electrodes 121 and 122 and the longitudinal direction of the exterior portion 130 (first and second members 131 and 132) are parallel to each other, and a space is provided in the short direction of the exterior portion 130. The detection electrodes 121 and 122 are formed.

  The exterior portion 130 is bent at a substantially central position in the short direction, and the piezoelectric film 110 is sandwiched between the bent inner portions. At this time, the exterior portion 130 holds the piezoelectric film 110 so that the detection electrodes 121 and 122 are in contact with substantially the entire surface of both surfaces of the piezoelectric film 110. The detection electrodes 121 and 122 are attached to the piezoelectric film 110 with a double-sided adhesive tape. The double-sided adhesive tape or the piezoelectric film 110 is at least larger than the detection electrodes 121 and 122, and the detection electrode 121 and the detection electrode 122 are insulated by this structure.

  With this configuration, it is possible to realize a configuration in which the piezoelectric film 110 is sandwiched between the detection electrodes 121 and 122 without directly forming the detection electrodes 121 and 122 on both main surfaces of the piezoelectric film 110 by sputtering or the like. . Accordingly, in order to form a structure in which the piezoelectric film 110 is sandwiched between the detection electrodes 121 and 122, it is not necessary to directly form an electrode on the piezoelectric film 110. When PLLA is used as the piezoelectric film 110, the surface of PLLA is inactive, and when an electrode is directly formed on the surface of PLLA, the adhesion strength is low and difficult. However, in such a method, the electrode can be reliably bonded to PLLA.

  The plate member 20 has a rectangular shape with a length LL in the longitudinal direction (y direction) and a length LS in the short direction (x direction). The plate member 20 is made of a material having a certain degree of rigidity, and is formed of a glass flat plate, for example.

  The plate member 20 includes one main surface 201 and the other main surface 202, and one end in the length LS direction of the plate member 20 is an end side 211, and the other end is an end side 212. One end of the plate member 20 in the length LL direction is an end side 221, and the other end is an end side 222.

  The outer periphery of the plate member 20 is fixed by a frame or the like (not shown). Therefore, when the operation surface which is the one main surface is pushed in by the operator or the like, the plate member 20 is pushed in the direction perpendicular to the operation surface so that the displacement amount becomes smaller toward the outer periphery with the push position as the center. Bends in a displaced manner. Due to this bending, the plate member 20 is distorted in a direction parallel to the operation surface.

  The piezoelectric sensor 11 is arranged near one end in the longitudinal direction of the plate member 20 (y direction in FIG. 1), that is, near the end side 221. At this time, the piezoelectric sensor 11 is disposed on the plate member 20 so that the longitudinal direction of the piezoelectric sensor 11 is parallel to the short direction of the plate member 20 (the x direction in FIG. 1). The piezoelectric sensor 11 is arranged so that the main surface of the piezoelectric sensor 11 and the main surface of the plate member 20 are parallel to each other. The piezoelectric sensor 11 is disposed on the other main surface opposite to the operation surface of the plate member 20.

  The mounting member 30 is interposed between the plate member 20 and the piezoelectric sensor 11 and includes an adhesive 31 and an adhesive 32. The pressure-sensitive adhesive 31 sticks members facing each other through the pressure-sensitive adhesive 31 without performing heat treatment, and has a low elastic constant. For the adhesive 31, for example, a double-sided tape may be used. The adhesive 32 adheres members facing each other through the adhesive 32 by thermosetting, and has a high elastic constant after adhesion. For example, an epoxy resin adhesive or a hot melt adhesive may be used as the adhesive 32.

  The adhesive 31 is provided in a region where the exterior portion 130 on one main surface of the piezoelectric sensor 11 overlaps the piezoelectric film 110. The adhesive 32 is provided in a region where the exterior portion 130 on one main surface of the piezoelectric sensor 11 does not overlap the piezoelectric film 110. In other words, the adhesive 31 is provided in the central region where the piezoelectric film 110 exists along the longitudinal direction of the piezoelectric sensor 11, and the longitudinal direction sandwiching the region where the piezoelectric film 110 exists is sandwiched. Adhesives 32 are respectively provided in the regions at both ends.

  With such a configuration, both end portions of the piezoelectric sensor 11 in the longitudinal direction are firmly attached to the plate member 20. Further, in order to cure the adhesive 32, heat is applied to this portion, but since the piezoelectric film 110 does not exist in this portion, the piezoelectric film 110 is not damaged by the heat that cures the adhesive. However, in practice, the piezoelectric film 110 may be provided up to a region where the adhesive 32 is present, assuming that the adhesive 32 is damaged.

  FIG. 4 is a diagram showing a state of propagation of strain generated in the plate member, FIG. 4 (A) shows a case where only an adhesive is used, and FIG. 4 (B) uses the configuration of the present embodiment. Show the case.

  By using the configuration of the present embodiment, as shown in FIG. 4B, the stress due to the strain generated in the plate member 20 is transmitted to the piezoelectric sensor 11 without being attenuated by the adhesive 32, The piezoelectric film 110 of the piezoelectric sensor 11 is also distorted. The detection electrodes 121 and 122 of the exterior portion 130 and the piezoelectric film 110 are also bonded with a double-sided adhesive tape, and there is attenuation here, but the overall attenuation can be kept small. If the amount of distortion caused by the adhesive between the detection electrodes 121 and 122 and the piezoelectric film 110 is attenuated to about 30%, the piezoelectric film 110 has a distortion generated in the plate member 20. About 70% of the strain is generated, and a corresponding charge is generated. Therefore, the distortion of the plate member 20, that is, the pressing force can be detected with high sensitivity. On the other hand, as shown in FIG. 4A, when only the adhesive 31 is used, the strain generated in the plate member 20 is attenuated by the adhesive 31 and applied to the exterior portion 130, and further, the strain generated in the exterior portion 130. Is relaxed by the pressure-sensitive adhesive 31 of the double-sided pressure-sensitive adhesive tape and added to the piezoelectric film 110, so that the total amount of strain becomes small.

  Furthermore, when only the adhesive 31 is used, when the ambient temperature of the piezoelectric sensor 11 increases, the elastic constant of the adhesive 31 further decreases, and the detection sensitivity of the piezoelectric sensor 11 is further reduced. However, by partially using the adhesive 32 as in the present embodiment, such deterioration in detection sensitivity due to temperature rise can be suppressed.

Moreover, the following effects can be obtained by mounting the piezoelectric sensor 11 on the plate member 20 as described above.
When the vicinity of the approximate center of the operation surface of the plate member 20 is pressed, near the end in the longitudinal direction of the plate member 20, distortion along the short direction of the plate member 20 occurs more than other portions. Therefore, the sensitivity to the pressing force can be further improved by mounting the piezoelectric sensor 11 at such a position.

  Further, since the longitudinal direction of the piezoelectric sensor 11 (piezoelectric film 110) is parallel to the short direction of the plate member 20, the strain generated in the piezoelectric film 110 is parallel to the longitudinal direction of the piezoelectric film 110. Therefore, the sensitivity to the distortion of the piezoelectric film 110 can be improved. At this time, since both ends in the longitudinal direction of the piezoelectric sensor 11 (piezoelectric film 110) are firmly bonded, strain can be received with higher sensitivity. And since the uniaxial extending | stretching direction is 45 degrees with respect to a longitudinal direction, the electric charge amount which generate | occur | produces with respect to the distortion | strain of a longitudinal direction can be enlarged.

  Thus, by using the configuration of the present embodiment, it is possible to realize the pressure detection sensor 10 that detects pressure on the operation surface with very high sensitivity.

  Further, although the adhesive 32 is cured by thermocompression bonding, since the adhesive 32 is disposed in a region where it does not overlap the piezoelectric film 110, the heat for curing the adhesive 32 is almost propagated to the piezoelectric film 110. Therefore, the piezoelectric film 110 is hardly heated. Therefore, deterioration of the piezoelectricity of the piezoelectric film 110 can be suppressed. Thereby, it is possible to detect the pressure on the operation surface with higher sensitivity.

  In addition, although the adhesive 31 can also be abbreviate | omitted, the further effect shown next can be acquired by providing the adhesive 31. FIG.

  For example, when the adhesive 31 is omitted, if the piezoelectric sensor 11 is slack in the region between the adhesives 32 after the adhesive 32 is cured, the deformation of the plate member 20 cannot be reliably captured. By adhering this region to the plate member 20 with the adhesive 31, the piezoelectric sensor 11 can be securely attached to the plate member 20 without sagging.

  Further, by providing the pressure-sensitive adhesive 31, the work of mounting the piezoelectric sensor 11 on the plate member 20 can be facilitated. Specifically, when the piezoelectric sensor 11 is attached to the plate member 20, first, the adhesive 31 having the release sheet attached is attached to the surface opposite to the surface in contact with the piezoelectric sensor 11. Further, an adhesive 32 is applied to the piezoelectric sensor 11. Next, the release sheet is peeled off, and the piezoelectric sensor 11 is attached to the plate member 20. Next, the processing head for curing the adhesive is pressed against the region where the adhesive 32 is applied, and heat-pressed. By this thermocompression bonding, the adhesive 32 is cured, and the piezoelectric sensor 11 and the plate member 20 are bonded.

  Thus, if the adhesive 31 is used, the piezoelectric sensor 11 can be temporarily fixed to the plate member 20 easily. Thereby, the piezoelectric sensor 11 can be easily mounted at a desired position of the plate member 20.

  Next, a touch input device according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a plan view showing the configuration of the touch input device according to the second embodiment of the present invention. FIG. 6 is an exploded perspective view for explaining the structure of the piezoelectric sensor used in the touch input device according to the second embodiment of the present invention.

  The touch-type input device 2 of the present embodiment is based on the press detection sensor 1 shown in the first embodiment, and further includes a touch panel 50 for position detection. The piezoelectric sensor 11A of this embodiment is obtained by adding a detection circuit unit 123, routing conductors 1212, 1222, 125, and a connector unit 124 to the piezoelectric sensor 11 shown in the first embodiment. The part having the detection function is the same as that of the piezoelectric sensor 11 shown in the first embodiment. Therefore, in the following, only the points added from the first embodiment and different points will be specifically described.

  As shown in FIG. 5, the touch input device 2 includes a piezoelectric sensor 11 </ b> A, a plate member 20, a mounting member 30, and a touch panel 50.

  As shown in FIG. 6, the piezoelectric sensor 11A includes a piezoelectric film 110, detection electrodes 121 and 122, and an exterior part 130A. The exterior portion 130A is formed by integrally forming a first member 131, a second member 132, and a third member 133. The first and second members 131 and 132 are the same as those in the first embodiment. The first member 131 is formed with a detection electrode 121 and a lead-out electrode 1211, and the second member 132 is detected. A working electrode 122 and a routing electrode 1221 are formed.

  The third member 133 has a long shape, and is connected to the end of the first member 131 on the side where the routing electrode 1211 is formed. The third member 133 is connected to the first member 131 so that the longitudinal direction of the third member 133 and the longitudinal direction of the first member 131 are orthogonal to each other.

  The third member 133 is formed with routing electrodes 1212 and 1222 that extend in the longitudinal direction of the third member 133. The routing electrode 1212 is connected to the routing electrode 1211, and the routing electrode 1222 is connected to the routing electrode 1221.

  A detection circuit portion 123 and a connector portion 124 are formed at the end of the third member 133 opposite to the end connected to the first member 131. The detection circuit unit 123 is connected to the routing electrodes 1212 and 1222. The detection circuit unit 123 is formed with a circuit that generates a pressing force detection signal based on the charges detected by the detection electrodes 121 and 122. The connector part 124 is connected to the detection circuit part 123 through the routing electrode 125. The detection circuit unit 123 outputs the pressing force detection signal to the external circuit through the electrode 125 and the connector unit 124.

  As in the first embodiment, the piezoelectric sensor 11 </ b> A having such a shape is provided near one end 221 in the longitudinal direction of the plate member 20, more specifically, at an end portion that is out of the operation receiving region 200 of the plate member 20. The piezoelectric film 110 is arranged so that the long direction of the piezoelectric film 110 is parallel to the short direction of the plate member 20. At this time, the third member 133 of the exterior portion 130 </ b> A is disposed in the vicinity of the one end 211 in the short direction of the plate member 20 along the longitudinal direction of the plate member 20.

  The touch panel 50 is, for example, a capacitance type flat plate position detection sensor, and is mounted on the surface of the plate member 20 opposite to the operation surface. At this time, the touch panel 50 includes the operation receiving area 200 and is disposed so as not to overlap the piezoelectric sensor 11A.

  With this configuration, it is possible to detect the operation position while detecting the pressing force on the operation surface with high sensitivity.

  The structure of the piezoelectric sensor shown in the second embodiment can also be applied to a press detection sensor as shown in the first embodiment that does not include the touch panel 50.

  In each of the above-described embodiments, polylactic acid has been described as an example. However, the present invention can also be applied to the case where other piezoelectric materials whose piezoelectricity deteriorates due to high heat are used.

1: Press detection sensor 2: Touch type input device 11: Piezoelectric sensor 20: Plate member 30: Mounting member 50: Touch panel 110: Piezoelectric film 111, 112: Detection electrodes 1211, 1221, 1212, 1222, 125: Leading electrode 123: detection circuit part 124: connector part 130, 130A: exterior part 131: first member 132: second member 200: operation receiving area 201: one main surface 202: other main surfaces 211, 212, 221 and 222: end sides 900: Uniaxial stretching direction

Claims (6)

On the other hand, the main surface is an operation surface, and an operation input member that is distorted by pressing of the operation surface;
A sensor unit mounted on the operation input member and having a piezoelectric film;
A mounting member for mounting the operation input member and the sensor unit;
A press detection sensor comprising:
The sensor unit is
The exterior portion includes a shape in which the piezoelectric film is sandwiched so that detection conductors are disposed on both main surfaces of the piezoelectric film, and the length in the direction in which the strain is generated is longer than that of the piezoelectric film. ,
The mounting member is
It is a thermosetting adhesive provided in the region of both ends in the exterior part,
Press detection sensor. The mounting member is
A pressure-sensitive adhesive is further provided in a region sandwiched between the adhesives at both end regions in the exterior part,
The pressure detection sensor according to claim 1. When the press detection sensor is seen through from a direction orthogonal to the operation surface, the piezoelectric film is not disposed in a region where the adhesive is present,
The pressure detection sensor according to claim 1 or 2. The piezoelectric film is polylactic acid stretched at least in a uniaxial direction,
The piezoelectric film is sandwiched between the exterior portions so that the direction of stretching is approximately 45 ° with respect to the direction connecting both ends of the exterior portion where the adhesive is attached.
The press detection sensor in any one of Claims 1 thru | or 3. The operation input member is a rectangle whose operation surface has a longitudinal direction and a short direction,
The piezoelectric film and the exterior part constituting the sensor part are long and have a long direction and a short direction,
The sensor unit is mounted near one end in the longitudinal direction of the operation input member such that the longitudinal direction is substantially parallel to the lateral direction of the operation input member.
The pressure detection sensor according to any one of claims 1 to 4. A pressure detection sensor according to claim 5;
A position detection touch panel disposed on the back side of the operation input member;
A touch-type input device comprising:

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