Electronic equipment

Abstract

An electronic device comprising: an operation panel having a first upper main face and a first lower main face aligned in a vertical direction, wherein a part of the body of a user or an operation component contacts the first upper main face; a sensor that is fixed to the first lower main face and detects deformation of the operation panel; and an adhesive component for fixing the sensor to the first lower main face, wherein the Young's modulus of the adhesive component is 0.9 to 10 MPa.

Description

[Technical field]

[0001] The present invention relates to an electronic device equipped with an operation panel. [Background technology]

[0002] As an example of an invention relating to a conventional electronic device, a pressure sensor described in Patent Document 1 is known. This pressure sensor includes an operation surface, a plate-shaped member, and a piezoelectric film. A user performs a pressing operation by touching the operation surface. The plate-shaped member is deflected by the pressing operation. The piezoelectric film is attached to the plate-shaped member and therefore deflects together with the plate-shaped member. As a result, the pressing force is detected by the output of the piezoelectric film. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2015 / 083678 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the pressure sensor described in Patent Document 1, there is a demand for detecting with high accuracy the magnitude of the force with which the user presses the operation surface.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide an electronic device that can accurately detect the amount of force with which a user presses an operation panel. [Means for solving the problem]

[0006] An electronic device according to one embodiment of the present invention includes: an operation panel having a first upper main surface and a first lower main surface aligned in a vertical direction, the operation panel being in contact with a part of a user's body or an operation member; a sensor fixed to the first lower main surface and configured to detect deformation of the operation panel; a first adhesive member fixing the sensor to the first lower principal surface; Equipped with The first adhesive member has a Young's modulus of 0.9 MPa or more and 10 MPa or less. Effect of the Invention

[0007] According to the electronic device of the present invention, the magnitude of the force with which the user presses the operation panel can be detected with high accuracy. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is an exploded perspective view of an electronic device 1. As shown in FIG. [Diagram 2] FIG. 2 is a cross-sectional view of the operation panel 2, the display panel 4, the cushioning member 9, the plate-like member 7, the adhesive member 8 and the sensor 6 taken along the line AA. [Diagram 3] FIG. 3 is a plan view of the sensor 6 viewed downward and a cross-sectional view of the sensor 6 viewed forward. [Figure 4] FIG. 4 is a cross-sectional view of the operation panel 2, the display panel 4, the cushioning member 9, the plate-like member 7, the adhesive member 8 and the sensor 6. As shown in FIG. [Diagram 5] FIG. 5 is a graph showing the relationship between the amount of elongation of the piezoelectric film 14 and time. [Figure 6] FIG. 6 is a graph showing the relationship between the Young's modulus and the overshoot rate of the adhesive member 8. As shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Embodiment] The configuration of an electronic device 1 according to an embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is an exploded perspective view of the electronic device 1. Fig. 2 is a cross-sectional view of the operation panel 2, display panel 4, cushioning member 9, plate-like member 7, adhesive member 8, and sensor 6 taken along line AA. Fig. 3 is a plan view of the sensor 6 viewed downward and a cross-sectional view of the sensor 6 viewed forward.

[0010] In addition, in this specification, directions are defined as follows. In the electronic device 1, the direction in which the first upper principal surface US1 and the first lower principal surface LS1 of the operation panel 2 are aligned is defined as the up-down direction. In addition, the direction in which the long side of the operation panel 2 of the electronic device 1 extends when viewed in the up-down direction is defined as the front-rear direction. In addition, the direction in which the short side of the operation panel 2 of the electronic device 1 extends when viewed in the up-down direction is defined as the left-right direction. The up-down direction, the left-right direction, and the front-rear direction are mutually orthogonal. Note that the definitions of directions in this specification are merely examples. Therefore, the directions in the actual use of the electronic device 1 do not need to match the directions in this specification. In addition, the up-down direction may be reversed in FIG. 1. The left-right direction may be reversed in FIG. 1. The front-rear direction may be reversed in FIG. 1.

[0011] The electronic device 1 is a portable electronic terminal such as a smartphone, a tablet computer, etc. As shown in Figures 1 and 2, the electronic device 1 includes an operation panel 2, a housing 3, a display panel 4, an adhesive member 5, a sensor 6, a plate-like member 7, an adhesive member 8, and a cushioning member 9.

[0012] As shown in Fig. 1, the operation panel 2 has a first upper principal surface US1 and a first lower principal surface LS1 aligned in the up-down direction. When viewed in the up-down direction, the operation panel 2 has a rectangular shape having two long sides extending in the front-rear direction and two short sides extending in the left-right direction. A part of the user's body or an operation member comes into contact with the first upper principal surface US1 of the operation panel 2. In this embodiment, the operation panel 2 is a transparent plate. The material of the operation panel 2 is, for example, glass.

[0013] As shown in FIG. 1, the display panel 4 has a second upper principal surface US2 and a second lower principal surface LS2 aligned in the vertical direction. The display panel 4 has a rectangular shape having two long sides extending in the front-rear direction and two short sides extending in the left-right direction when viewed in the vertical direction. The display panel 4 is fixed to the first lower principal surface LS1 of the operation panel 2. The display panel 4 is fixed to the operation panel 2 by adhesive, double-sided tape, or the like. The entire display panel 4 overlaps with the operation panel 2 when viewed in the vertical direction. Moreover, the display panel 4 does not protrude from the outer edge of the operation panel 2 when viewed in the vertical direction. The display panel 4 is, for example, an organic EL display or a liquid crystal display. The display panel 4 may include a touch panel for detecting the position where the user touches the operation panel 2. However, the touch panel may be included in the operation panel 2.

[0014] As shown in FIG. 1, the cushioning member 9 has a third upper main surface US3 and a third lower main surface LS3 aligned in the vertical direction. The cushioning member 9 has a rectangular shape having two long sides extending in the front-rear direction and two short sides extending in the left-right direction when viewed in the vertical direction. The cushioning member 9 is fixed to the first lower main surface LS1 of the operation panel 2. In this specification, "the cushioning member 9 is fixed to the first lower main surface LS1 of the operation panel 2" means that the cushioning member 9 may be directly fixed to the first lower main surface LS1 of the operation panel 2, or the cushioning member 9 may be fixed to another member fixed to the first lower main surface LS1 of the operation panel 2. In this embodiment, the cushioning member 9 is fixed to the second lower main surface LS2 of the display panel 4. The cushioning member 9 is fixed to the display panel 4 by adhesive, double-sided tape, or the like. The entire cushioning member 9 overlaps with the display panel 4 when viewed in the vertical direction. Moreover, the cushioning member 9 does not protrude from the outer edge of the display panel 4 when viewed in the vertical direction.

[0015] The cushioning member 9 absorbs the impact applied to the portable electronic terminal. For example, when the portable electronic terminal falls and hits the floor or the like, the operation panel 2 may be deformed and may hit a member stored under the opening Op of the housing 3. At this time, the cushioning member 9 absorbs the impact generated when the operation panel 2 hits the member stored under the opening Op of the housing 3. In this way, the cushioning member 9 prevents the operation panel 2 from being damaged. The cushioning member 9 is, for example, a cushion, a sponge, an impact absorbing gel, or a double-sided tape.

[0016] As shown in FIG. 1, the plate-shaped member 7 has a fourth upper main surface US4 and a fourth lower main surface LS4 aligned in the vertical direction. When viewed in the vertical direction, the plate-shaped member 7 has a rectangular shape having two long sides extending in the front-rear direction and two short sides extending in the left-right direction. The plate-shaped member 7 is fixed to the first lower main surface LS1 of the operation panel 2. In this specification, "the plate-shaped member 7 is fixed to the first lower main surface LS1 of the operation panel 2" means that the plate-shaped member 7 may be directly fixed to the first lower main surface LS1 of the operation panel 2, or the plate-shaped member 7 may be fixed to another member fixed to the first lower main surface LS1 of the operation panel 2. In this embodiment, the plate-shaped member 7 is fixed to the third lower main surface LS3 of the cushioning member 9. The plate-shaped member 7 is fixed to the cushioning member 9 by an adhesive, a double-sided tape, or the like. When viewed in the vertical direction, the entire plate-shaped member 7 overlaps with the cushioning member 9. Moreover, the plate-shaped member 7 does not protrude from the outer edge of the buffer member 9 when viewed in the up-down direction. The rigidity of the plate-shaped member 7 is higher than the rigidity of the sensor 6 described later. The material of such a plate-shaped member 7 is, for example, a metal such as SUS (Stainless Used Steel). In this embodiment, the material of the plate-shaped member 7 is SUS. However, the material of the plate-shaped member 7 may be a material other than a metal. The material other than a metal is, for example, a resin. The Young's modulus of the plate-shaped member 7 may be 1 GPa or more.

[0017] As shown in FIG. 1, the housing 3 is located below the operation panel 2. The housing 3 is a box. The housing 3 has a rectangular shape when viewed in the vertical direction. The long sides of the housing 3 extend in the front-rear direction. The short sides of the housing 3 extend in the left-right direction. The outer edge of the housing 3 when viewed in the vertical direction coincides with the outer edge of the operation panel 2 when viewed in the vertical direction. However, the top surface of the housing 3 is open. The opening Op of the housing 3 has a rectangular shape when viewed in the vertical direction. Components such as a battery and a circuit board are stored below the opening Op of the housing 3.

[0018] 1, the adhesive member 5 fixes a portion of the first lower main surface LS1 of the operation panel 2 to the housing 3. More specifically, the adhesive member 5 fixes the periphery of the opening Op of the housing 3 to the vicinity of the outer edge of the operation panel 2. Thus, the adhesive member 5 has a rectangular frame shape surrounding the display panel 4 when viewed in the vertical direction. Therefore, the adhesive member 5 does not overlap with the display panel 4 when viewed in the vertical direction. The adhesive member 5 as described above is waterproof.

[0019] The sensor 6 detects deformation of the operation panel 2. The sensor 6 is fixed to the first lower main surface LS1 of the operation panel 2 as shown in FIG. 1. In this specification, "the sensor 6 is fixed to the first lower main surface LS1 of the operation panel 2" means that the sensor 6 may be directly fixed to the first lower main surface LS1 of the operation panel 2, or the sensor 6 may be fixed to another member fixed to the first lower main surface LS1 of the operation panel 2. In this embodiment, the sensor 6 is fixed to the fourth lower main surface LS4 of the plate-shaped member 7 as shown in FIG. 1. The sensor 6 is fixed to the plate-shaped member 7 by an adhesive member 8 to be described later. The sensor 6 has a rectangular shape when viewed in the vertical direction. The sensor 6 has a longitudinal direction extending in the left-right direction. The sensor 6 is located at the center of the front-rear direction of the operation panel 2 when viewed in the vertical direction.

[0020] When the user presses the operation panel 2 and the operation panel 2 bends downward, the display panel 4 and the plate-like member 7 also bend downward. The sensor 6 then bends downward together with the plate-like member 7. This causes the sensor 6 to output a detection signal corresponding to the deformation of the operation panel 2 caused by the user pressing the operation panel 2. The sensor 6 will be described in detail below with reference to FIG. 3.

[0021] As shown in FIG. 3, the sensor 6 includes a piezoelectric film 14, an upper electrode 15a, a lower electrode 15b, a substrate 16, and an adhesive layer 18. The piezoelectric film 14 has a sheet shape. Therefore, as shown in FIG. 3, the piezoelectric film 14 has a fifth upper main surface US5 and a fifth lower main surface LS5 aligned in the vertical direction. The length of the piezoelectric film 14 in the left-right direction is longer than the length of the piezoelectric film 14 in the front-rear direction. That is, the piezoelectric film 14 has a longitudinal direction extending in the left-right direction. In this embodiment, the piezoelectric film 14 has a rectangular shape with long sides extending in the left-right direction when viewed in the vertical direction. The piezoelectric film 14 generates charges according to the deformation amount of the piezoelectric film 14. In this embodiment, the charges generated by the piezoelectric film 14 are mainly due to expansion and contraction in the left-right direction. As a result, the length of the short side of the sensor 6 is 10 mm or less, and the ratio of the length of the long side to the length of the short side of the sensor 6 may be 3 or more and 10 or less. In this embodiment, the piezoelectric film 14 is a PLA film. The piezoelectric film 14 is described in more detail below.

[0022] The piezoelectric film 14 has a characteristic that the polarity of the electric charge generated when the piezoelectric film 14 is stretched in the left-right direction is opposite to the polarity of the electric charge generated when the piezoelectric film 14 is stretched in the front-back direction. Specifically, the piezoelectric film 14 is a film formed from a chiral polymer. An example of the chiral polymer is polylactic acid (PLA), particularly L-type polylactic acid (PLLA). The main chain of PLLA made of a chiral polymer has a helical structure. PLLA has a piezoelectricity in which the molecules are oriented by uniaxial stretching. The piezoelectric film 14 has a piezoelectric constant of d14. The uniaxial stretching direction (orientation direction) of the piezoelectric film 14 forms an angle of 45 degrees with respect to each of the front-back direction and the left-right direction. This 45 degrees includes, for example, an angle including about 45 degrees ±10 degrees. As a result, the piezoelectric film 14 generates an electric charge when the piezoelectric film 14 is stretched in the left-right direction or compressed in the left-right direction. The polarity of the charge generated by the piezoelectric film 14 when it is stretched in the left-right direction is different from the polarity of the charge generated by the piezoelectric film 14 when it is stretched in the front-back direction. For example, the piezoelectric film 14 generates a positive charge when it is stretched in the left-right direction. For example, the piezoelectric film 14 generates a negative charge when it is stretched in the front-back direction. The magnitude of the charge depends on the amount of deformation of the piezoelectric film 14 due to stretching or compression. More precisely, the magnitude of the charge is proportional to the derivative of the amount of deformation of the piezoelectric film 14 due to stretching or compression.

[0023] The upper electrode 15a is a signal electrode. A detection signal is output from the upper electrode 15a. As shown in FIG. 3, the upper electrode 15a is provided on a fifth upper principal surface US5 of the piezoelectric film 14. The lower electrode 15b is a ground electrode. The lower electrode 15b is connected to ground. As shown in FIG. 3, the lower electrode 15b is provided on a fifth lower principal surface LS5 of the piezoelectric film 14.

[0024] The substrate 16 is provided on the upper electrode 15a as shown in FIG. 3. The substrate 16 holds the piezoelectric film 14, the upper electrode 15a, and the lower electrode 15b, and is deformed together with the piezoelectric film 14. The substrate 16 has a sheet shape. The substrate 16 has an upper main surface and a lower main surface. The length of the substrate 16 in the left-right direction is longer than the length of the substrate 16 in the front-rear direction. In this embodiment, the substrate 16 has a rectangular shape having long sides extending in the left-right direction when viewed in the up-down direction. The long sides of the substrate 16 are longer than the long sides of the piezoelectric film 14, the long sides of the upper electrode 15a, and the long sides of the lower electrode 15b. The short sides of the substrate 16 are longer than the short sides of the piezoelectric film 14, the short sides of the upper electrode 15a, and the short sides of the lower electrode 15b. The piezoelectric film 14, the upper electrode 15a, and the lower electrode 15b are arranged in a region surrounded by the outer edge of the substrate 16 when viewed in the up-down direction. The material of the substrate 16 is, for example, polyurethane or PET. The base material 16 may be formed of a flexible substrate or a printed wiring board. When the base material 16 is formed of a flexible substrate or a printed wiring board, the upper electrode 15a may be formed in the flexible substrate or the printed wiring board, and the piezoelectric film 14 may be fixed to the base material 16 by an adhesive layer 18 described later.

[0025] The adhesive layer 18 fixes the piezoelectric film 14, the upper electrode 15a, and the lower electrode 15b to the substrate 16. More specifically, the adhesive layer 18 is provided on the lower main surface of the substrate 16 as shown in FIG. 3. The adhesive layer 18 covers a part of the lower main surface of the substrate 16. Also, the adhesive layer 18 covers the entire upper main surface of the upper electrode 15a as shown in FIG. 3. The outer edge of the adhesive layer 18 is surrounded by the outer edge of the substrate 16 when viewed in the up-down direction. The adhesive layer 18 bonds the upper electrode 15a and the substrate 16. As a result, the deformation of the substrate 16 is transmitted to the piezoelectric film 14. The material of the adhesive layer 18 is, for example, a double-sided tape, a thermosetting adhesive, or a thermoplastic adhesive.

[0026] The adhesive member 8 fixes the sensor 6 to the first lower main surface LS1 of the operation panel 2, as shown in Fig. 1. In this specification, "the adhesive member 8 fixes the sensor 6 to the first lower main surface LS1 of the operation panel 2" may mean that the adhesive member 8 directly fixes the sensor 6 to the first lower main surface LS1 of the operation panel 2, or that the adhesive member 8 fixes the sensor 6 to another member fixed to the first lower main surface LS1 of the operation panel 2. In this embodiment, the adhesive member 8 fixes the sensor 6 to the plate-shaped member 7, as shown in Fig. 2. More specifically, the adhesive member 8 fixes the base material 16 of the sensor 6 to the fourth lower main surface LS4 of the plate-shaped member 7.

[0027] The sensor 6 is attached to the first lower main surface LS1 of the operation panel 2 or another member fixed to the first lower main surface LS1 of the operation panel 2 via the adhesive member 8 when the electronic device 1 is assembled. Therefore, it is desirable that the sensor 6 can be easily attached to the first lower main surface LS1 of the operation panel 2 or another member fixed to the first lower main surface LS1 of the operation panel 2 by a small jig or the like without using large equipment such as a thermocompression bonding equipment or a coating equipment. In addition, a thin portable electronic terminal is required. Therefore, it is desirable that the adhesive member 8 is a sheet-like member whose thickness in the vertical direction is easy to manage. Therefore, in this embodiment, the adhesive member 8 is a double-sided tape. Also, it is desirable that the adhesive member 8 overlaps the entire fifth upper main surface US5 of the piezoelectric film 14 of the sensor 6 when viewed in the vertical direction. In this embodiment, the shape of the adhesive member 8 is the same as the shape of the base material 16 of the sensor 6 when viewed in the vertical direction, as shown in FIG. 1 and FIG. 3. 2 and 3, the adhesive member 8, the base material 16 of the sensor 6, the adhesive layer 18 of the sensor 6, and the piezoelectric film 14 of the sensor 6 are arranged in this order on a straight line parallel to the vertical direction.

[0028] Incidentally, the electronic device 1 has a structure that can accurately detect the magnitude of the force with which the user presses the operation panel 2. This structure will be described below. Fig. 4 is a cross-sectional view of the operation panel 2, the display panel 4, the cushioning member 9, the plate-like member 7, the adhesive member 8, and the sensor 6. Fig. 5 is a graph showing the relationship between the amount of expansion of the piezoelectric film 14 and time. The horizontal axis indicates time. The vertical axis indicates the amount of expansion of the piezoelectric film 14.

[0029] In the electronic device 1, if the Young's modulus of the adhesive member 8 is low, an overshoot occurs. The occurrence of such an overshoot causes a decrease in the accuracy of detecting the magnitude of the force with which the user presses the operation panel 2. The following describes the overshoot.

[0030] As shown in the upper diagram of FIG. 4, when the user presses the operation panel 2 downward, the operation panel 2 bends so as to protrude downward. At this time, the operation panel 2 extends in a direction perpendicular to the up-down direction. The direction perpendicular to the up-down direction is, for example, the front-rear direction or the left-right direction. The buffer member 9, the plate-like member 7, the adhesive member 8, and the sensor 6 are fixed to the first lower main surface LS1 of the operation panel 2. Therefore, as shown in FIG. 5, the buffer member 9, the plate-like member 7, the adhesive member 8, and the sensor 6 extend in a direction perpendicular to the up-down direction. That is, the piezoelectric film 14 extends in a direction perpendicular to the up-down direction. As a result, the detection signal output by the sensor 6 increases.

[0031] However, if the Young's modulus of the adhesive member 8 is low, the adhesive member 8 will attempt to return to a flat shape due to stress relaxation, as shown in the lower diagram of FIG. 4. As a result, the amount of elongation of the piezoelectric film 14 will decrease, as shown in FIG. 5. In other words, an overshoot will occur. On the other hand, if the Young's modulus of the adhesive member 8 is high, such an overshoot will be less likely to occur. Also, the amount of reduction in the amount of elongation of the piezoelectric film 14 due to stress relaxation is proportional to the thickness of the adhesive member 8 in the vertical direction. In other words, when the Young's modulus of the adhesive member 8 is the same, if the adhesive member 8 is thin in the vertical direction, such an overshoot will be less likely to occur.

[0032] Therefore, the inventors of the present application performed a computer simulation to suppress the occurrence of overshoot. Specifically, the thickness of the adhesive member 8 was set to 100 μm, and the Young's modulus was changed in the range of 0.1 MPa to 10 MPa to examine the overshoot rate. As shown in FIG. 5, the overshoot rate is a value obtained by dividing the difference between the maximum value MAX of the elongation amount of the sensor 6 and the final value END of the elongation amount of the sensor 6 by the maximum value MAX of the elongation amount of the sensor 6, and multiplying the result by 100. The material of the plate-like member 7 is SUS. FIG. 6 is a graph showing the relationship between the Young's modulus of the adhesive member 8 and the overshoot rate. The horizontal axis indicates the Young's modulus of the adhesive member 8. The vertical axis indicates the overshoot rate.

[0033] As shown in FIG. 6, it is found that if the Young's modulus of the adhesive member 8 is 0.9 MPa or more, the overshoot rate is 20% or less. Therefore, the Young's modulus of the adhesive member 8 needs to be 0.9 MPa or more. As shown in FIG. 6, it has been confirmed that if the Young's modulus of the adhesive member 8 is 5 MPa, the overshoot rate is nearly 0%, and if the Young's modulus of the adhesive member 8 is 10 MPa, the overshoot rate is sufficiently low. Therefore, the Young's modulus of the adhesive member 8 needs to be 10 MPa or less, and more preferably 5 MPa or less. This allows the electronic device 1 to accurately detect the magnitude of the force with which the user presses the operation panel 2.

[0034] [Other embodiments] The electronic device 1 according to the present invention is not limited to the electronic device 1, and can be modified within the scope of the gist thereof.

[0035] The piezoelectric film 14 may be a PVDF (polyvinylidene fluoride) film. The piezoelectric film 14 may be a piezoelectric ceramic. The sensor 6 may include a strain sensor.

[0036] In the electronic device 1, the housing 3, the display panel 4, the adhesive member 5, the plate-like member 7, and the cushioning member 9 are not essential components.

[0037] The adhesive member 5 does not necessarily have to be waterproof.

[0038] In addition, the two sides extending in the front-rear direction may be short sides, and the two sides extending in the left-right direction may be long sides.

[0039] The sensor 6 may be provided at a position other than the center in the front-rear direction of the plate-like member 7 when viewed in the up-down direction.

[0040] The operation panel 2 does not have to be a transparent plate. For example, the operation panel 2 may be a resin plate or a printed wiring board. The operation panel 2 may include a touch pad instead of a touch panel. In this case, the display panel 4 and the plate-like member 7 are not necessary.

[0041] The sensor 6 does not necessarily have a longitudinal direction extending in the left-right direction, but may have a longitudinal direction extending in the front-rear direction.

[0042] The display panel 4 does not necessarily have to include a touch panel.

[0043] The adhesive member 8 is not limited to a double-sided tape, and may be a thermosetting adhesive or a thermoplastic adhesive.

[0044] The shape of the adhesive member 8 does not have to be the same as the shape of the base material 16 of the sensor 6 when viewed in the up-down direction.

[0045] If the adhesive member 8 has a thickness of 40 μm or more in the vertical direction, the adhesive member 8 can more firmly fix the sensor 6 to the operation panel 2. Therefore, the adhesive member 8 may have a thickness of 40 μm or more and 100 μm or less in the vertical direction.

[0046] The computer simulation performed on the electronic device 1 is not limited to the adhesive member 8, but can also be applied to an adhesive member or adhesive layer that overlaps with the plate-like member 7 and the piezoelectric film 14 when viewed in the top-bottom direction and is between the plate-like member 7 and the piezoelectric film 14. That is, the computer simulation performed on the electronic device 1 can also be applied to the adhesive layer 18. Therefore, the Young's modulus of the adhesive layer 18 may be 0.9 MPa or more and 10 MPa or less.

[0047] If the thickness of the adhesive layer 18 in the vertical direction is 10 μm or more, the adhesive layer 18 can more firmly fix the piezoelectric film 14 to the substrate 16. Therefore, the thickness of the adhesive layer 18 in the vertical direction may be from 10 μm to 100 μm.

[0048] It is preferable that the cushioning material 9 is soft so as to absorb shocks applied to the portable electronic terminal 1. Specifically, the Young's modulus of the cushioning material 9 may be 300 kPa or less. [Explanation of symbols]

[0049] 1:Electronic equipment 2: Operation panel 3: Housing 4: Display panel 5: Adhesive material 6: Sensor 7: Plate-shaped member 8: Adhesive material 9: Cushioning material 14: Piezoelectric film 15a: Upper electrode 15b: Lower electrode 16: Base material 18: Adhesive layer

Claims

1. an operation panel having a first upper main surface and a first lower main surface aligned in a vertical direction, the operation panel being in contact with a part of a user's body or an operation member; a sensor fixed to the first lower main surface and configured to detect a deformation of the operation panel; an adhesive member that fixes the sensor to the first lower principal surface; a buffer member having a third upper main surface and a third lower main surface aligned in the vertical direction and fixed to the first lower main surface; a plate-like member having a fourth upper main surface and a fourth lower main surface aligned in the vertical direction and fixed to the first lower main surface; It is equipped with The Young's modulus of the adhesive member is 5 MPa or more and 10 MPa or less, The Young's modulus of the buffer member is 0.3 MPa or less. electronic equipment.

2. The thickness of the adhesive member in the vertical direction is 40 μm or more and 100 μm or less.

2. The electronic device according to claim 1.

3. a display panel having a second upper main surface and a second lower main surface aligned in the vertical direction and fixed to the first lower main surface, 3. The electronic device according to claim 1 or 2.

4. The operation panel has a rectangular shape having two long sides extending in a front-rear direction and two short sides extending in a left-right direction when viewed in the up-down direction.

3. The electronic device according to claim 1 or 2.

5. The sensor is located at a center of the operation panel in the front-rear direction when viewed in the up-down direction.

5. The electronic device according to claim 4.

6. The sensor includes a piezoelectric film having a fifth upper principal surface and a fifth lower principal surface aligned in the vertical direction.

3. The electronic device according to claim 1 or 2.

7. a polarity of an electric charge generated by the piezoelectric film when the piezoelectric film is stretched in a left-right direction is different from a polarity of an electric charge generated by the piezoelectric film when the piezoelectric film is stretched in a front-back direction; 7. The electronic device according to claim 6.

8. The sensor includes a substrate having an upper main surface and a lower main surface aligned in the vertical direction; an adhesive layer that fixes the piezoelectric film to the substrate; the adhesive member, the base material, the adhesive layer, and the piezoelectric film are arranged in this order on a straight line parallel to the up-down direction; 7. The electronic device according to claim 6.

9. The Young's modulus of the adhesive layer is 0.9 MPa or more and 10 MPa or less.

9. The electronic device according to claim 8.

10. The thickness of the adhesive layer in the vertical direction is 10 μm or more and 100 μm or less.

9. The electronic device according to claim 8.

11. The sensor has a longitudinal direction extending in the left-right direction.

3. The electronic device according to claim 1 or 2.

12. The sensor includes a strain sensor.

3. The electronic device according to claim 1 or 2.

13. The material of the operation panel is glass.

3. The electronic device according to claim 1 or 2.

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