Patent Application
20240410744
The present disclosure relates to a vibration device and an electronic device including the vibration device.
As an example of a conventional vibration device, a vibration device described in Patent Document 1 is known. The vibration device described in Patent Document 1 is used in an electronic device including an electronic device body and an operation target with which a part of a user's body comes into contact for operating the electronic device.
In the vibration device described in Patent Document 1, there is a demand for detecting a force applied to the operation target and detecting displacement of the operation target in a direction orthogonal to a direction of the force applied to the operation target without attaching a sensor to the operation target.
Therefore, an object of the present disclosure is to provide a vibration device capable of detecting a force applied to the operation target and detecting displacement of the operation target in a direction orthogonal to a direction of the force applied to the operation target without attaching a sensor to the operation target, and an electronic device.
A vibration device according to an embodiment of the present disclosure includes: a support member that includes: a fixing portion fixed to a fixing member, a vibration portion supporting a vibrated member, and an elastically deformable portion connecting the fixing portion and the vibration portion; an actuator constructed to vibrate a vibrated member in a left-right direction, the actuator being attached to the fixing portion or the fixing member and the vibration portion or the vibrated member; and a sensor constructed to detect a force applied to the vibrated member and displacement of the vibrated member in the left-right direction, the sensor being attached to the elastically deformable portion, wherein the elastically deformable portion has a first elastic modulus in the left-right direction, a second elastic modulus in a front-rear direction, and a third elastic modulus in a up-down direction, the first elastic modulus is smaller than the second elastic modulus, and the third elastic modulus is smaller than the second elastic modulus.
In the present specification, directions are defined as follows. A direction in which an upper principal surface US3 and a lower principal surface LS3 of a support member 3 are arranged is defined as an up-down direction. A direction in which the long sides of the upper principal surface US3 of the support member 3 extend, as viewed in the up-down direction, is defined as a left-right direction. A direction in which the short sides of the upper principal surface US3 of the support member 3 extend, as viewed in the up-down direction, is defined as a front-rear direction. The up-down direction, the left-right direction, and the front-rear direction are orthogonal to each other. Note that the definition of directions in the present description is an example. Therefore, a direction at the time of actual use of a vibration device 10 does not need to coincide with a direction in the present description. The up-down direction may be reversed in
Hereinafter, X and Y represent components or members of an electronic device 100. In the present specification, each part of X is defined as follows unless otherwise specified. An upper part of X means the upper half of X. An upper end of X means the end of X in the upward direction. An upper end portion of X means the upper end of X and the vicinity thereof. This definition also applies to directions other than the upward direction.
In addition, “X is located on Y” means that X is located directly above Y. Therefore, X overlaps Y as viewed in the up-down direction. “X is located above Y” means that X is located directly above Y and that X is located diagonally above Y. Therefore, X may or may not overlap Y as viewed in the up-down direction. This definition also applies to directions other than the upward direction.
In the present specification, “X and Y are electrically connected” means that electricity is conducted between X and Y. Therefore, X and Y may be in contact with each other, or X and Y may not be in contact with each other. When X and Y are not in contact with each other, Z having conductivity is disposed between X and Y.
According to the vibration device of the present disclosure, it is possible to detect a force applied to the operation target and to detect displacement of the operation target in a direction orthogonal to a direction of the force applied to the operation target without attaching a sensor to the operation target.
Hereinafter, a configuration of a vibration device 10 according to a first embodiment of the present disclosure will be described with reference to the drawings.
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The housing 1 is a rectangular parallelepiped box. As illustrated in
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The elastically deformable portion 33 elastically deforms. That is, the elastically deformable portion 33 has a first elastic modulus in the left-right direction. The elastically deformable portion 33 has a second elastic modulus in the front-rear direction. The elastically deformable portion 33 has a third elastic modulus in the up-down direction. In the present embodiment, the elastically deformable portion 33 includes a first elastically deformable portion 331, a second elastically deformable portion 332, a third elastically deformable portion 333, and a fourth elastically deformable portion 334. Each of the first elastically deformable portion 331, the second elastically deformable portion 332, the third elastically deformable portion 333, and the fourth elastically deformable portion 334 elastically deforms. That is, each of the first elastically deformable portion 331, the second elastically deformable portion 332, the third elastically deformable portion 333, and the fourth elastically deformable portion 334 has a first elastic modulus in the left-right direction. Each of the first elastically deformable portion 331, the second elastically deformable portion 332, the third elastically deformable portion 333, and the fourth elastically deformable portion 334 has a second elastic modulus in the front-rear direction. Each of the first elastically deformable portion 331, the second elastically deformable portion 332, the third elastically deformable portion 333, and the fourth elastically deformable portion 334 has a third elastic modulus in the up-down direction.
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The length of the elastically deformable portion 33 in the up-down direction is shorter than the length of the elastically deformable portion 33 in the front-rear direction. More specifically, the length of the first elastically deformable portion 331 in the up-down direction is shorter than the length of the elastically deformable portion 33 in the front-rear direction. The same applies to the second elastically deformable portion 332, the third elastically deformable portion 333, and the fourth elastically deformable portion 334. Accordingly, the third elastic modulus of the elastically deformable portion 33 is smaller than the second elastic modulus of the elastically deformable portion 33. More specifically, the third elastic modulus of each of the first elastically deformable portion 331, the second elastically deformable portion 332, the third elastically deformable portion 333, and the fourth elastically deformable portion 334 is smaller than the second elastic modulus of each of the first elastically deformable portion 331, the second elastically deformable portion 332, the third elastically deformable portion 333, and the fourth elastically deformable portion 334. That is, the elastically deformable portion 33 is more likely to elastically deform in the up-down direction than in the front-rear direction. More specifically, each of the first elastically deformable portion 331, the second elastically deformable portion 332, the third elastically deformable portion 333, and the fourth elastically deformable portion 334 is more likely to elastically deform in the up-down direction than in the front-rear direction.
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The first piezoelectric film 41 is a piezoelectric body. That is, the actuator 4 includes a piezoelectric body. As illustrated in
The first electrode is provided on an upper surface of the first piezoelectric film 41 (not illustrated). The second electrode is provided on a lower surface of the first piezoelectric film 41 (not illustrated). Each of the first electrode and the second electrode is a metal film formed by vapor deposition.
As illustrated in
When an AC voltage is applied to the actuator 4, the actuator 4 stretches and contracts in the left-right direction. More specifically, when an AC voltage is applied between the first electrode and the second electrode, the first piezoelectric film 41 stretches and contracts in the left-right direction. For example, when a positive voltage is applied to the actuator 4, the actuator 4 is stretched in the left-right direction. On the other hand, when a negative voltage is applied to the actuator 4, the actuator 4 contracts in the left-right direction. Therefore, when an AC voltage is applied to the actuator 4, the actuator 4 vibrates in the left-right direction. Accordingly, the actuator 4 vibrates the vibrated member 2 and the vibration portion 32 of the support member 3 in the left-right direction. Note that the AC voltage is a voltage at which the polarity cyclically changes between positive and negative.
The sensor 5 detects a force applied to the vibrated member 2 and displacement of the vibrated member 2 in the left-right direction. More specifically, the sensor 5 includes a plurality of sensor portions. In the present embodiment, as illustrated in
In the present embodiment, each of the first sensor portion 51 and the fourth sensor portion 54 detects a force applied to the vibrated member 2. Hereinafter, each of the first sensor portion 51 and the fourth sensor portion 54 will be described. Note that the fourth sensor portion 54 has the same structure as in the first sensor portion 51. Therefore, hereinafter, the description will be given focusing on the first sensor portion 51, and the description of the fourth sensor portion 54 will be omitted.
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The second piezoelectric film 511 generates a charge corresponding to a differential value of displacement of the second piezoelectric film 511.
Specifically, the second piezoelectric film 511 is a film made of polyvinylidene fluoride (PVDF). PVDF has piezoelectricity in which molecules are oriented when uniaxial stretching is performed. The second piezoelectric film 511 has a piezoelectric constant of d31.
As illustrated in
The third electrode U51 is a ground electrode. The third electrode U51 is connected to a ground potential. As illustrated in
The fourth electrode D51 is a signal electrode. As illustrated in
The first charge amplifier 512 converts the charge generated by the second piezoelectric film 511 into a voltage signal. After the conversion, the first charge amplifier 512 outputs the voltage signal to the first integration circuit 513.
The first integration circuit 513 time-integrates the voltage signal. Accordingly, the first sensor portion 51 outputs a first detection signal indicating a relationship between a deformation amount of the second piezoelectric film 511 and the time.
In the present embodiment, each of the second sensor portion 52 and the third sensor portion 53 detects displacement of the vibrated member 2 in the left-right direction. Hereinafter, each of the second sensor portion 52 and the third sensor portion 53 will be described. Note that the third sensor portion 53 has the same structure as in the second sensor portion 52. Therefore, hereinafter, the description will be given focusing on the second sensor portion 52, and the description of the third sensor portion 53 will be omitted. Regarding the second sensor portion 52, only portions different from those of the first sensor portion 51 will be described, and the description thereof will be omitted.
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The third piezoelectric film 521 is a film made of a chiral polymer. The chiral polymer is, for example, polylactic acid (PLA), particularly poly-L-lactic acid (PLLA). PLLA, which is a chiral polymer, has a main chain with a helical structure. PLLA has piezoelectricity in which molecules are oriented when uniaxial stretching is performed. The third piezoelectric film 521 has a piezoelectric constant of d14.
The third piezoelectric film 521 has a characteristic in which the polarity of the charge generated when the third piezoelectric film 521 is stretched in the left-right direction is opposite to the polarity of the charge generated when the second piezoelectric film 511 is stretched in the front-rear direction.
As illustrated in
According to the vibration device 10, it is possible to detect a force applied to the operation target and to detect displacement of the operation target in a direction orthogonal to a direction of the force applied to the operation target without attaching a sensor to the operation target. More specifically, the support member 3 includes the elastically deformable portion 33 connecting the fixing portion 31 and the vibration portion 32 and elastically deforming. The vibration portion 32 supports the vibrated member 2. Therefore, when a force is applied to the vibrated member 2 in the up-down direction, the elastically deformable portion 33 elastically deforms in the up-down direction. The sensor 5 detecting a force applied to the vibrated member 2 is attached to the elastically deformable portion 33. The third elastic modulus of the elastically deformable portion 33 in the up-down direction is smaller than the second elastic modulus of the elastically deformable portion 33 in the front-rear direction. Therefore, the elastically deformable portion 33 is likely to elastically deform in the up-down direction. Accordingly, the sensor 5 can detect deformation of the elastically deformable portion 33 in the up-down direction. As a result, according to the vibration device 10, a force applied to the vibrated member 2 can be detected without attaching the sensor 5 to the vibrated member 2.
The vibrated member 2 vibrates in the left-right direction. With the vibration of the vibrated member 2 in the left-right direction, the vibration portion 32 vibrates in the left-right direction. With the vibration of the vibration portion 32 in the left-right direction, the elastically deformable portion 33 elastically deforms in the left-right direction. The first elastic modulus of the elastically deformable portion 33 in the left-right direction is smaller than the second elastic modulus of the elastically deformable portion 33 in the front-rear direction. Therefore, the elastically deformable portion 33 is likely to elastically deform in the left-right direction. Accordingly, the sensor 5 can detect deformation of the elastically deformable portion 33 in the left-right direction. As a result, according to the vibration device 10, the displacement of the vibrated member 2 in the left-right direction can be detected without attaching the sensor 5 to the vibrated member 2.
Hereinafter, a vibration device 10a according to a second embodiment of the present disclosure will be described with reference to the drawings.
The vibration device 10a is different from the vibration device 10 in that the fixing portion 31 includes a fourth fixing portion 31d, a fifth fixing portion 31e, a sixth fixing portion 31f, and a seventh fixing portion 31g, the position of the elastically deformable portion 33 is different, and the right end portion RE4 of the actuator 4 is attached to the housing 1 with an adhesive (not illustrated) interposed therebetween in a state where the actuator 4 is slightly extended in the left-right direction.
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The actuator 4 is attached to the housing 1 and the vibration portion 32 of the support member 3.
The vibration device 10a as described above also has the same effect as the vibration device 10.
Hereinafter, a vibration device 10b according to a third embodiment of the present disclosure will be described with reference to the drawings.
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In the present embodiment, in order to fix the fixing portion 31 to the housing 1, the spacer 9 is provided between the fixing portion 31 of the support member 3 and the stopper 7. As illustrated in
The conductive cushion member 8 has conductivity. The conductive cushion member 8 has a rectangular parallelepiped shape. Therefore, as illustrated in
The resistance value of the conductive cushion member 8 changes due to expansion and contraction. More specifically, the resistance value of the conductive cushion member 8 is increased by the conductive cushion member being compressed. The resistance value of the conductive cushion member 8 is increased by the conductive cushion member being stretched.
As illustrated in
Each of the first conductor pattern C1 and the second conductor pattern C2, the conductive cushion member 8, and the stopper 7 are arranged in this order without a space from the top to the bottom. That is, the upper principal surface US8 of the conductive cushion member 8 is in contact with each of the first conductor pattern C1 and the second conductor pattern C2. The lower principal surface LS8 of the conductive cushion member 8 is in contact with the stopper 7.
The first conductor pattern C1 is electrically connected to the second conductor pattern C2 with the conductive cushion member 8 interposed therebetween.
The vibration device 10b as described above also has the same effect as the vibration device 10. According to the vibration device 10b, a force applied to an operation target can be accurately detected without attaching a sensor to the operation target. More specifically, the vibration portion 32 has a first portion P1 overlapping the vibrated member 2 as viewed in the up-down direction. A first conductor pattern C1 and a second conductor pattern C2 are provided in a part of the first portion P1. The first conductor pattern C1 is electrically connected to the second conductor pattern C2 with the conductive cushion member 8 interposed therebetween. In the conductive cushion member 8, the upper principal surface US8 is in contact with the first conductor pattern C1 and the second conductor pattern C2, and the lower principal surface LS8 is in contact with the stopper 7 whose position in the up-down direction is fixed. When a force is applied to the vibrated member 2 in the downward direction, the conductive cushion member 8 is compressed. Accordingly, the resistance of the conductive cushion member 8 decreases. Therefore, a force applied to the vibrated member 2 can be detected by detecting a change in resistance between the first conductor pattern C1 and the second conductor pattern C2. As a result, according to the vibration device 10b, a force applied to an operation target can be accurately detected without attaching a sensor to the operation target.
The vibration device according to the present disclosure is not limited to the vibration devices 10, 10a, and 10b, and can be modified in the scope of the gist of the present disclosure. Further, structures of the vibration devices 10, 10a, and 10b may be optionally combined. The electronic device according to the present disclosure is not limited to the electronic devices 100, 100a, and 100b, and may be modified in any way within the scope of the essence thereof. In addition, the structures of the electronic devices 100, 100a, and 100b may be arbitrarily combined.
Note that the use application of the electronic device 100 is not limited to providing tactile feedback to the user 200.
Note that, as illustrated in
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Note that the actuator 4 may be attached to the fixing portion 31 of the support member 3 or the housing 1, and the vibrated member 2.
Note that the vibration device 10 is not limited to being used for the electronic device 100.
Note that the “fixing member” of the present disclosure is not limited to the housing 1. The “fixing member” of the present disclosure may be, for example, an electronic component or the like fixed to the housing 1.
Note that the vibrated member 2 may be pressed by an operation member without limited to the user 200.
Note that the housing 1 is not limited to a rectangular parallelepiped box.
Note that the first opening OP1 may not have a rectangular shape in the up-down direction.
Note that the vibrated member 2 may not have a plate shape. The vibrated member 2 may not have the upper principal surface US2 and the lower principal surface LS2 arranged in the up-down direction. The upper principal surface US2 and the lower principal surface LS2 may not be parallel to each other.
Each of the upper principal surface US2 and the lower principal surface LS2 may not have a rectangular shape having a long side extending in the left-right direction and a short side extending in the front-rear direction.
The position of the vibrated member 2 in the up-down direction may not be equal to the position of the upper surface of the housing 1 in the up-down direction.
The vibrated member 2 may not be located in the first opening OP1 as viewed in the up-down direction.
The vibrated member 2 may be in contact with the housing 1.
The material of the substrate 301 is not limited to glass epoxy, and may be a metal such as stainless used steel (SUS).
Note that the substrate 301 may not have a plate shape. The substrate 301 may not have the upper principal surface US301 and the lower principal surface LS301 arranged in the up-down direction. The upper principal surface US301 and the lower principal surface LS301 may not be parallel to each other.
Each of the upper principal surface US301 and the lower principal surface LS301 of the substrate 301 may not have a rectangular shape having a long side extending in the left-right direction and a short side extending in the front-rear direction.
The plurality of conductor patterns 302 are not limited to being formed by patterning a copper foil attached to the substrate 301 by photolithography or the like. In the vibration devices 10 and 10a, the plurality of conductor patterns 302 are not essential constituent elements.
Each of the first fixing portion 31a, the second fixing portion 31b, and the third fixing portion 31c may be fixed to the housing 1 with an adhesive. Therefore, each of the first fixing portion 31a, the second fixing portion 31b, and the third fixing portion 31c may not have the screw hole 303. The housing 1 may not have a screw hole. The bolt 6 is not an essential constituent element.
Note that the first fixing portion 31a may not be provided with the second opening OP2.
Note that the vibration portion 32 may not be provided with the third opening OP3.
Note that the vibrated member 2 is not limited to being provided on the upper surface of the vibration portion 32.
Note that the length of the elastically deformable portion 33 in the left-right direction may not be shorter than the length of the elastically deformable portion 33 in the front-rear direction. The first elastic modulus of the elastically deformable portion 33 may be smaller than the second elastic modulus of the elastically deformable portion 33.
Note that the length of the elastically deformable portion 33 in the left-right direction may not be shorter than the length of the elastically deformable portion 33 in the front-rear direction. The third elastic modulus of the elastically deformable portion 33 may be smaller than the second elastic modulus of the elastically deformable portion 33.
Note that the elastically deformable portion 33 may not include the first elastically deformable portion 331, the second elastically deformable portion 332, the third elastically deformable portion 333, and the fourth elastically deformable portion 334.
Note that the actuator 4 may not include a piezoelectric body. The actuator 4 may be, for example, a linear resonant actuator (LRA).
Note that the actuator 4 may not have a film shape. The actuator 4 may not have the first principal surface US4 and the second principal surface LS4 arranged in the up-down direction. The first principal surface US4 and the second principal surface LS4 may not be parallel to each other.
Note that each of the first principal surface US4 and the second principal surface LS4 may not have a rectangular shape having a long side extending in the left-right direction and a short side extending in the front-rear direction.
Note that the principal surfaces of the first piezoelectric film 41 may not have a rectangular shape as viewed in the up-down direction. Each of the upper principal surface of the first piezoelectric film 41 and the lower principal surface of the first piezoelectric film 41 may not have a rectangular shape having a long side extending in the left-right direction and a short side extending in the front-rear direction as viewed in the up-down direction.
Note that at least any one of the first sensor portion 51, the second sensor portion 52, the third sensor portion 53, and the fourth sensor portion 54 may detect a force applied to the vibrated member 2. At least any one of the first sensor portion 51, the second sensor portion 52, the third sensor portion 53, and the fourth sensor portion 54 may detect displacement of the vibrated member 2 in the left-right direction.
Note that the sensor 5 may not include four sensor portions. Therefore, the number of sensor portions detecting a force applied to the vibrated member 2 may be different from the number of sensor portions detecting displacement of the vibrated member 2 in the left-right direction.
Note that each of the upper principal surface US51 and the lower principal surface LS51 of the first sensor portion 51 may not have a rectangular shape as viewed in the up-down direction. Each of the upper principal surface US51 and the lower principal surface LS51 may not have a short side extending in the left-right direction and a long side extending in the front-rear direction. The upper principal surface US51 and the lower principal surface LS51 may not be parallel to each other.
Note that each of an upper principal surface US52 and a lower principal surface LS52 of the second sensor portion 52 may not have a rectangular shape as viewed in the up-down direction. Each of the upper principal surface US52 and the lower principal surface LS52 may not have a short side extending in the left-right direction and a long side extending in the front-rear direction. The upper principal surface US52 and the lower principal surface LS52 may not be parallel to each other.
Note that each of an upper principal surface and a lower principal surface of the third sensor portion 53 may not have a rectangular shape as viewed in the up-down direction. Each of the upper principal surface and the lower principal surface of the third sensor portion 53 may not have a short side extending in the left-right direction and a long side extending in the front-rear direction. The upper principal surface and the lower principal surface of the third sensor portion 53 may not be parallel to each other.
Note that each of an upper principal surface and a lower principal surface of the fourth sensor portion 54 may not have a rectangular shape as viewed in the up-down direction. Each of the upper principal surface and the lower principal surface of the fourth sensor portion 54 may not have a short side extending in the left-right direction and a long side extending in the front-rear direction. The upper principal surface and the lower principal surface of the fourth sensor portion 54 may not be parallel to each other.
Note that the upper principal surface of the second piezoelectric film 511 and the lower principal surface of the second piezoelectric film 511 may not be parallel to each other. Each of the upper principal surface of the second piezoelectric film 511 and the lower principal surface of the second piezoelectric film 511 may not have a short side extending in the left-right direction and a long side extending in the front-rear direction.
Note that the upper principal surface of the third piezoelectric film 521 and the lower principal surface of the third piezoelectric film 521 may not be parallel to each other. Each of the upper principal surface of the third piezoelectric film 521 and the lower principal surface of the third piezoelectric film 521 may not have a short side extending in the left-right direction and a long side extending in the front-rear direction.
Note that the uniaxial stretching axis OD1 of the second piezoelectric film 511 is not limited to forming an angle of 0 degrees or 180 degrees with respect to the front-rear direction. For example, the uniaxial stretching axis OD1 of the second piezoelectric film 511 may form an angle of 0 degrees or 180 degrees with respect to the left-right direction.
Note that the conductive cushion member 8 may not have a rectangular parallelepiped shape.
Note that the stopper 7 may be fixed to the housing 1 with an adhesive. Therefore, the stopper 7 may not have a screw hole.
Note that the spacer 9 is not an essential constituent element.
Note that the resistance value of the conductive cushion member 8 may be reduced by the conductive cushion member being compressed. The resistance value of the conductive cushion member 8 may be increased by the conductive cushion member being stretched. The resistance value of the conductive cushion member 8 may change due to expansion and contraction.
Each of the first conductor pattern C1 and the second conductor pattern C2, the conductive cushion member 8, and the stopper 7 may be arranged in this order with a space from the top to the bottom.
The present disclosure has the following structures.
(1) A vibration device including: a support member that includes: a fixing portion fixed to a fixing member, a vibration portion supporting a vibrated member, and an elastically deformable portion connecting the fixing portion and the vibration portion; an actuator constructed to vibrate a vibrated member in a left-right direction, the actuator being attached to the fixing portion or the fixing member and the vibration portion or the vibrated member; and a sensor constructed to detect a force applied to the vibrated member and displacement of the vibrated member in the left-right direction, the sensor being attached to the elastically deformable portion, wherein the elastically deformable portion has a first elastic modulus in the left-right direction, a second elastic modulus in a front-rear direction, and a third elastic modulus in a up-down direction, the first elastic modulus is smaller than the second elastic modulus, and the third elastic modulus is smaller than the second elastic modulus.
(2) The vibration device according to (1), wherein a length of the elastically deformable portion in the left-right direction is shorter than a length of the elastically deformable portion in the front-rear direction, and a length of the elastically deformable portion in the up-down direction is shorter than the length of the elastically deformable portion in the front-rear direction.
(3) The vibration device according to (1) or (2), wherein the elastically deformable portion includes a first elastically deformable portion, a second elastically deformable portion, a third elastically deformable portion, and a fourth elastically deformable portion, the sensor includes a plurality of sensor portions attached to any one of the first elastically deformable portion, the second elastically deformable portion, the third elastically deformable portion, and the fourth elastically deformable portion, each of the plurality of sensor portions is constructed to detect the force applied to the vibrated member or the displacement of the vibrated member in the left-right direction, the first elastically deformable portion is located on a left of the vibration portion in the left-right direction, the second elastically deformable portion is located on a right of the vibration portion in the left-right direction, the third elastically deformable portion is located on the left of the vibration portion in the left-right direction, the fourth elastically deformable portion is located on the right of the vibration portion in the left-right direction, the first elastically deformable portion viewed in the up-down direction overlaps a front portion of the vibration portion viewed in the up-down direction as viewed in the left-right direction, the second elastically deformable portion viewed in the up-down direction overlaps the front portion of the vibration portion viewed in the up-down direction as viewed in the left-right direction, the third elastically deformable portion viewed in the up-down direction overlaps a rear portion of the vibration portion viewed in the up-down direction as viewed in the left-right direction, and the fourth elastically deformable portion viewed in the up-down direction overlaps the rear portion of the vibration portion viewed in the up-down direction as viewed in the left-right direction.
(4) The vibration device according to (1) or (2), wherein the elastically deformable portion includes a first elastically deformable portion, a second elastically deformable portion, a third elastically deformable portion, and a fourth elastically deformable portion, the sensor includes a plurality of sensor portions attached to any one of the first elastically deformable portion, the second elastically deformable portion, the third elastically deformable portion, and the fourth elastically deformable portion, each of the plurality of sensor portions is constructed to detect the force applied to the vibrated member or the displacement of the vibrated member in the left-right direction, the first elastically deformable portion is located above the vibration portion in the up-down direction, the second elastically deformable portion is located above the vibration portion in the up-down direction, the third elastically deformable portion is located below the vibration portion in the up-down direction, the fourth elastically deformable portion is located below the vibration portion in the up-down direction, the first elastically deformable portion viewed in the up-down direction overlaps a left portion of the vibration portion viewed in the up-down direction as viewed in the front-rear direction, the second elastically deformable portion viewed in the up-down direction overlaps a right portion of the vibration portion viewed in the up-down direction as viewed in the front-rear direction, the third elastically deformable portion viewed in the up-down direction overlaps the left portion of the vibration portion viewed in the up-down direction as viewed in the front-rear direction, and the fourth elastically deformable portion viewed in the up-down direction overlaps the right portion of the vibration portion viewed in the up-down direction as viewed in the front-rear direction.
(5) The vibration device according any one of (1) to (4), wherein the sensor includes a piezoelectric film.
(6) The vibration device according to (5), wherein a principal surface of the piezoelectric film has a rectangular shape as viewed in the up-down direction.
(7) The vibration device described in (5) or (6), wherein the piezoelectric film is a film having polylactic acid stretched at least in a uniaxial direction.
(8) The vibration device described in any one of (5) to (7), wherein the piezoelectric film has a piezoelectric constant of d14.
(9) The vibration device according to any one of (1) to (8), further including the vibrated member.
(10) The vibration device according to (9), wherein the vibration device includes: a stopper having a fixed position in the up-down direction, and a conductive cushion member having conductivity, the conductive cushion member having an upper principal surface and a lower principal surface, a resistance value of the conductive cushion member changes with expansion and contraction thereof, the vibration portion has a first portion overlapping the vibrated member as viewed in the up-down direction, a first conductor pattern and a second conductor pattern are in a part of the first portion, the upper principal surface is in contact with each of the first conductor pattern and the second conductor pattern, the lower principal surface is in contact with the stopper, and the first conductor pattern is electrically connected to the second conductor pattern with the conductive cushion member interposed therebetween.
(11) An electronic device including: the vibration device according to any one of (1) to (10); and the fixing member.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2022-025583 | Feb 2022 | JP | national |
| 2022-084944 | May 2022 | JP | national |
The present application is a continuation of International application No. PCT/JP2023/005929, filed Feb. 20, 2023, which claims priority to Japanese Patent Application No. 2022-025583, filed Feb. 22, 2022, and Japanese Patent Application No. 2022-084944, filed May 25, 2022, the entire contents of each of which are incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/JP2023/005929 | Feb 2023 | WO |
| Child | 18810850 | US |
