JP2015050579A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device and a panel unit capable of reducing the damage on a piezoelectric element caused by external force.SOLUTION: An electronic device 1 comprises: a panel 10; a piezoelectric element 30; a housing 60 to which the panel 10 is attached; and an alleviation member 80 which is attached to the piezoelectric element 30 and alleviates the transmission of external force to the piezoelectric element 30. The alleviation member 80 has a contact part 81 which is brought into contact with part of the housing 60 at least when the external force is applied. The alleviation member 80 and the panel 10 are deformed due to the deformation of the piezoelectric element 30 so as to transmit air conduction sound and human body vibration sound to an object which comes into contact with the panel 10 thus deformed.

Description

  The present invention relates to an electronic device that vibrates a panel by applying a predetermined electrical signal (sound signal) to a piezoelectric element and transmits the vibration of the panel to a human body to transmit air conduction sound and human body vibration sound to a user. Regarding equipment.

  Patent Document 1 describes an electronic device such as a mobile phone that transmits air conduction sound and bone conduction sound to a user. According to Patent Document 1, air conduction sound is sound transmitted to the auditory nerve of a user by vibration of air that is caused by vibration of an object being transmitted to the eardrum through the external auditory canal. Have been described. Patent Document 1 describes that human body vibration sound is sound transmitted to the user's auditory nerve through a part of the user's body (for example, the cartilage of the outer ear) that contacts the vibrating object. ing.

JP 2005-348193 A

  In the electronic device described in Patent Document 1, no countermeasure is taken into account when an external force is applied to the piezoelectric element of the vibrating body.

  The objective of this invention is providing the electronic device and panel unit which can reduce the damage of the piezoelectric element by external force.

  An electronic apparatus according to the present invention includes a panel, a piezoelectric element, a housing to which the panel is attached, a relaxation member attached to the piezoelectric element, and relaxing a transmission of an external force to the piezoelectric element. The relaxation member has a relaxation member side contact portion that is in contact with the housing at least when an external force is applied. The relaxation member and the panel are deformed due to deformation of the piezoelectric element, and the deformation is deformed. Air conduction sound and human body vibration sound are transmitted to the object in contact with the panel.

  Preferably, the contact portion is provided around a position where the piezoelectric element is attached, and protrudes as compared with a surface where the piezoelectric element is attached.

  Preferably, the housing has a housing-side contact portion that contacts the relaxation member-side contact portion when at least an external force is applied, and the housing-side contact portion faces the relaxation member side. Protruding.

  Preferably, the contact portion is separated from the piezoelectric element.

  Preferably, the contact portion surrounds the piezoelectric element attached to the relaxation member.

  Preferably, the contact portion is provided at a peripheral edge of the position where the piezoelectric element is attached.

  Preferably, the contact portion is continuously provided in the same direction as the longitudinal direction of the piezoelectric element.

  Preferably, a distance from the contact portion to the housing facing the contact portion is smaller than a distance from the piezoelectric element to the housing facing the piezoelectric element.

  The electronic device of the present invention includes a panel, a piezoelectric element, a housing to which the panel is attached, a contact member that is attached to the periphery of the piezoelectric element and is in contact with the housing when an external force is applied, The panel is deformed due to deformation of the piezoelectric element, and air conduction sound and human body vibration sound are transmitted to an object in contact with the deforming panel.

  Preferably, the contact member is configured to surround the piezoelectric element.

  According to the electronic device and the panel unit according to the present invention, it is possible to reduce damage to the piezoelectric element due to external force.

It is a figure which shows the functional block of the electronic device which concerns on one Embodiment of this invention. It is a figure which shows the suitable shape of a panel. It is a figure which shows the mounting structure of the electronic device which concerns on 1st Embodiment. It is a figure which shows an example of the vibration of the panel of the electronic device which concerns on 1st Embodiment. It is a figure which shows the mounting structure of the electronic device which concerns on 2nd Embodiment. It is a figure which shows an example of the vibration of the panel of the electronic device which concerns on 2nd Embodiment. It is a figure which shows the example of joining of a panel and a housing | casing. FIG. 6 is an enlarged view of a part of the constituent members in the encircled portion of FIGS. 3 (b) and 5 (b). It is a figure which shows the 1st modification of FIG. It is an enlarged plan view of the relaxation member 80 and the piezoelectric element 30 of the electronic device according to the first and second embodiments. It is a figure which shows the 2nd modification of FIG. It is a figure which shows the 3rd modification of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing functional blocks of an electronic device 1 according to an embodiment of the present invention. The electronic device 1 is, for example, a mobile phone (smart phone), and includes a panel 10, a display unit 20, a piezoelectric element 30, an input unit 40, and a control unit 50.

  The panel 10 is a touch panel that detects contact or a cover panel that protects the display unit 20. The panel 10 is made of, for example, glass or a synthetic resin such as acrylic. The shape of the panel 10 may be a plate shape. The panel 10 may be a flat plate or a curved panel whose surface is smoothly inclined. When the panel 10 is a touch panel, the touch of a user's finger, pen, stylus pen, or the like is detected. As a detection method of the touch panel, any method such as a capacitance method, a resistance film method, a surface acoustic wave method (or an ultrasonic method), an infrared method, an electromagnetic induction method, and a load detection method can be used.

  The display unit 20 is a display device such as a liquid crystal display, an organic EL display, or an inorganic EL display. The display unit 20 is provided on the back surface of the panel 10. The display unit 20 is disposed on the back surface of the panel 10 by a bonding member (for example, an adhesive). The display unit 20 may be disposed apart from the panel 10 and supported by the housing of the electronic device 1.

  The piezoelectric element 30 is an element that expands or contracts or bends according to an electromechanical coupling coefficient of a constituent material by applying an electric signal (voltage). For these elements, for example, those made of ceramic or quartz are used. The piezoelectric element 30 may be a unimorph, bimorph, or multilayer piezoelectric element. The stacked piezoelectric element includes a stacked bimorph element in which bimorphs are stacked (for example, 16 layers or 24 layers are stacked). The laminated piezoelectric element is composed of a laminated structure of a plurality of dielectric layers made of, for example, PZT (lead zirconate titanate) and electrode layers arranged between the plurality of dielectric layers. A unimorph expands and contracts when an electric signal (voltage) is applied, and a bimorph bends when an electric signal (voltage) is applied.

  The piezoelectric element 30 is disposed on the back surface of the panel 10 (the surface on the inner side of the electronic device 1). The piezoelectric element 30 is attached to the panel 10 by a joining member (for example, double-sided tape). The piezoelectric element 30 may be attached to the panel 10 via an intermediate member (for example, a sheet metal). The piezoelectric element 30 is spaced from the inner surface of the housing 60 by a predetermined distance while being disposed on the back surface of the panel 10. The piezoelectric element 30 may be separated from the surface on the inner side of the housing 60 by a predetermined distance even in a stretched or bent state. That is, the distance between the piezoelectric element 30 and the inner surface of the housing 60 is preferably larger than the maximum deformation amount of the piezoelectric element 30.

  The input unit 40 receives an operation input from a user, and includes, for example, an operation button (operation key). In addition, when the panel 10 is a touch panel, the panel 10 can also accept the operation input from a user by detecting the contact from a user.

  The control unit 50 is a processor that controls the electronic device 1. The controller 50 applies a predetermined electrical signal (voltage corresponding to the audio signal) to the piezoelectric element 30. The voltage applied to the piezoelectric element 30 by the control unit 50 is, for example, ± 15 V, which is higher than ± 5 V, which is an applied voltage of a so-called panel speaker for the purpose of conducting sound by air conduction sound instead of human body vibration sound. It may be. As a result, even when the user presses the panel 10 against his / her body with a force of 3N or more (5N to 10N), for example, sufficient vibration is generated in the panel 10 to It is possible to generate a human body vibration sound through the section. Note that how much applied voltage is used can be appropriately adjusted according to the fixing strength of the panel 10 to the casing or the support member or the performance of the piezoelectric element 30. When the control unit 50 applies an electrical signal to the piezoelectric element 30, the piezoelectric element 30 expands or contracts or bends in the longitudinal direction. At this time, the panel 10 to which the piezoelectric element 30 is attached is deformed in accordance with expansion / contraction or bending of the piezoelectric element 30, and the panel 10 vibrates. For this reason, the panel 10 generates air conduction sound and, when the user contacts a part of the body (for example, cartilage of the outer ear), generates a human body vibration sound through the part of the body. For example, the control unit 50 can generate an air conduction sound and a human body vibration sound corresponding to the voice signal by applying an electrical signal corresponding to the voice signal related to the voice of the other party to the piezoelectric element 30, for example. The audio signal may relate to a ringing melody or a music piece including music. Note that the audio signal applied to the electrical signal may be based on music data stored in the internal memory of the electronic device 1, or music data stored in an external server or the like is reproduced via a network. May be.

  The panel 10 vibrates not only in the attachment region to which the piezoelectric element 30 is attached, but also in a region away from the attachment region. The panel 10 has a plurality of locations that vibrate in a direction intersecting the main surface of the panel 10 in the vibrating region, and the amplitude value of the vibration is increased from positive to negative with time in each of the plurality of locations. Or vice versa. At a certain moment, the panel 10 vibrates in such a manner that a portion having a relatively large vibration amplitude and a portion having a relatively small vibration amplitude are distributed randomly or periodically throughout the panel 10 at first glance. That is, vibrations of a plurality of waves are detected over the entire panel 10. Even when the user presses the panel 10 against his / her body with a force of 5N to 10N, for example, the control unit 50 does not attenuate the piezoelectric element 30 in order to prevent the above-described vibration of the panel 10 from being attenuated. The applied voltage may be ± 15V. Therefore, the user can hear the sound by bringing his / her ear into contact with a region away from the above-described region where the panel 10 is attached.

  Here, the panel 10 may be approximately the same size as the user's ear. The panel 10 may be larger than the user's ear, as shown in FIG. In this case, when the user listens to the sound, the entire ear is easily covered with the panel 10 of the electronic device 1, so that it is difficult for ambient sounds (noise) to enter the ear canal. Panel 10 is an area wider than an area having a length corresponding to the distance from the lower leg of the anti-annulus (lower anti-limb) to the anti-tragus and a width corresponding to the distance from the tragus to the anti-annulus. Should just vibrate. The panel 10 preferably has a length corresponding to the distance between a portion near the upper leg of the ankle ring (upper pair leg) in the ear ring and the earlobe, and a distance between the tragus and a portion near the ear ring in the ear ring. It suffices that a region having a width corresponding to is vibrated. The region having the above length and width may be a rectangular region, or may be an elliptical shape having the above length as the major axis and the above width as the minor axis. The average size of Japanese ears can be found by referring to the Japanese human body size database (1992-1994) created by the Human Life Engineering Research Center (HQL). If the panel 10 is larger than the average size of Japanese ears, the panel 10 is considered to be large enough to cover the entire foreign ear.

  The electronic device 1 can transmit air conduction sound and human body vibration sound through a part of the user's body (for example, cartilage of the outer ear) to the user by the vibration of the panel 10. Therefore, when outputting a sound having a volume equivalent to that of a conventional dynamic receiver, the sound transmitted to the periphery of the electronic device 1 due to the vibration of the air due to the vibration of the panel 10 is less than that of the dynamic receiver. Therefore, it is suitable, for example, when listening to a recorded message on a train or the like.

  In addition, since the electronic device 1 transmits a human body vibration sound by the vibration of the panel 10, even if the user wears an earphone or a headphone, for example, the user can bring the earphone into contact with the electronic device 1 by touching them. Or you can hear sound through headphones and body parts.

  The electronic device 1 transmits sound to the user by the vibration of the panel 10. Therefore, when the electronic device 1 does not include a separate dynamic receiver, it is not necessary to form an opening (sound outlet) for sound transmission in the housing, and the waterproof structure of the electronic device 1 can be simplified. In addition, when the electronic device 1 is provided with a dynamic receiver, the sound emission port is preferably closed by a member that allows gas to pass but not liquid. An example of the member that allows gas to pass but not liquid is Gore-Tex (registered trademark).

(First embodiment)
FIG. 3 is a diagram illustrating a mounting structure of the electronic device 1 according to the first embodiment. 3A is a front view, and FIG. 3B is a cross-sectional view taken along the line bb in FIG. 3A. The electronic device 1 shown in FIG. 3 is a smartphone in which a touch panel, which is a glass plate, is arranged as a panel 10 on the front surface of a housing 60 (for example, a metal or resin case). The panel 10 and the input unit 40 are supported by the housing 60, and the display unit 20 and the relaxation member 80 are bonded to the panel 10 by the joining member 70. The piezoelectric element 30 is bonded to the relaxation member 80 by a bonding member. Here, between the panel 10 and the piezoelectric element 30, a relaxation member 80 that relaxes transmission of external force to the piezoelectric element 30 is disposed. The joining member 70 is an adhesive having a thermosetting property or an ultraviolet curable property, a double-sided tape, or the like, and may be, for example, an optical elastic resin that is a colorless and transparent acrylic ultraviolet curable adhesive. The panel 10, the display part 20, and the piezoelectric element 30 are each substantially rectangular. The relaxation member 80 is an elastic member such as rubber or silicon. The relaxation member 80 may be a metal plate made of, for example, aluminum having a certain degree of elasticity. The relaxation member 80 may be a resin plate, for example. As resin which forms the resin-made board here, a polyamide-type resin is mentioned, for example. Examples of the polyamide-based resin include Reny (registered trademark), which is made of a crystalline thermoplastic resin obtained from metaxylylenediamine and adipic acid and is rich in strength and elasticity. Such a polyamide-based resin may be a reinforced resin reinforced with glass fiber, metal fiber, carbon fiber, or the like using itself as a base polymer. The strength and elasticity are appropriately adjusted according to the amount of glass fiber, metal fiber, carbon fiber, or the like added to the polyamide-based resin. The reinforced resin as described above is formed, for example, by impregnating a resin into a base material formed by braiding glass fiber, metal fiber, carbon fiber, or the like and curing it. The reinforced resin may be formed by mixing a finely cut fiber piece into a liquid resin and then curing it. The reinforced resin may be a laminate of a base material in which fibers are knitted and a resin layer.

  The display unit 20 is disposed substantially at the center in the short direction of the panel 10. The piezoelectric element 30 is disposed at a predetermined distance from an end portion in the longitudinal direction of the panel 10 and is arranged in the vicinity of the end portion so that the longitudinal direction of the piezoelectric element 30 is along the short side of the panel 10. The display unit 20 and the piezoelectric element 30 are arranged side by side in a direction parallel to the inner surface of the panel 10.

  FIG. 4 is a diagram illustrating an example of vibration of the panel 10 of the electronic device 1 according to the first embodiment. In the electronic device 1 according to the first embodiment, the display unit 20 is attached to the panel 10. For this reason, the lower part of the panel 10 is less likely to vibrate than the upper part of the panel 10 to which the piezoelectric element 30 is attached via the relaxation member 80. Therefore, sound leakage due to vibration of the lower portion of the panel 10 at the lower portion of the panel 10 can be reduced.

  As described above, according to the electronic apparatus 1 according to the present embodiment, the relaxation member 80 and the panel 10 are deformed due to the deformation of the piezoelectric element 30 attached to the relaxation member 80, and come into contact with the deformed panel 10. It conveys air conduction sound and human body vibration sound to the object. Thereby, the air conduction sound and the human body vibration sound can be transmitted to the user without causing the vibrating body to protrude from the outer surface of the housing 60. In addition, since it is not necessary to put the user's ears on the piezoelectric element itself, the piezoelectric element 30 itself is not easily damaged. Further, when the case 60 is deformed instead of the panel 10, the user tends to drop the terminal when generating vibration, whereas when the panel 10 is vibrated, Things are hard to happen.

(Second Embodiment)
FIG. 5 is a diagram illustrating a mounting structure of the electronic device 1 according to the second embodiment. 5 (a) is a front view, FIG. 5 (b) is a cross-sectional view taken along line bb in FIG. 5 (a), and FIG. 5 (c) is taken along line cc in FIG. 5 (a). It is sectional drawing. The electronic device 1 shown in FIG. 5 is a foldable mobile phone in which a cover panel (acrylic plate) that protects the display unit 20 as a panel 10 is arranged on the front surface of the upper housing 60. In the second embodiment, as in the first embodiment, a relaxation member 80 is disposed between the panel 10 and the piezoelectric element 30 to mitigate transmission of external force to the piezoelectric element 30. .

  The electronic device 1 according to the second embodiment has a structure in which the piezoelectric element 30 and the relaxation member 80 are bonded by the bonding member 70, and the relaxation member 80 and the panel 10 are bonded by the bonding member 70. In the second embodiment, the display unit 20 is not bonded to the panel 10 but is supported by the housing 60. That is, in the electronic device 1 according to the second embodiment, the display unit 20 is separated from the panel 10, and the display unit 20 and the support unit 90 that is a part of the housing 60 are bonded by the bonding member 70. Structure. In addition, the support part 90 is not limited to the structure as a part of the housing | casing 60, It is possible to comprise as a member independent of the housing | casing 60 with a metal, resin, etc.

  FIG. 6 is a diagram illustrating an example of vibration of the panel 10 of the electronic device 1 according to the second embodiment. In the electronic device 1 according to the second embodiment, the panel 10 is an acrylic plate having a lower rigidity than the glass plate, and the display unit 20 is not bonded to the back surface of the panel 10. Compared to the electronic apparatus 1 according to the first embodiment, the amplitude generated by the piezoelectric element 30 is increased. In addition, the panel 10 vibrates not only in the attachment region to which the piezoelectric element 30 is attached, but also in a region away from the attachment region. For this reason, in addition to the air conduction sound through the air, the user can hear the human body vibration sound by bringing his / her ear into contact with an arbitrary position of the panel 10.

  Thus, according to the electronic device 1 according to the present embodiment, the relaxation member 80 and the panel 10 are deformed due to the deformation of the piezoelectric element 30 attached to the back surface of the panel 10 via the relaxation member 80, The air conduction sound and the human body vibration sound are transmitted to the object that contacts the deformed panel 10. Thereby, the air conduction sound and the human body vibration sound can be transmitted to the user without causing the vibrating body to protrude from the outer surface of the housing 60. For example, when an external force is applied to the panel 10 due to the electronic device 1 falling on the ground, the external force is first transmitted to the relaxation member 80. The relaxation member 80 has a predetermined elasticity, and is elastically deformed by an external force transmitted from the panel 10. Thereby, at least a part of the external force applied to the panel 10 is absorbed by the relaxation member 80, and the external force transmitted to the piezoelectric element 30 is reduced. As a result, damage to the piezoelectric element 30 can be reduced. Further, when the relaxing member 80 is disposed between the piezoelectric element 30 and the housing 60, the housing 60 is deformed, for example, when the electronic device 1 falls on the ground, and the deformed housing 60 becomes the piezoelectric element 30. The possibility that the piezoelectric element 30 is damaged due to the collision can be reduced.

  In addition, the panel 10 is deformed to transmit air conduction sound and human body vibration sound not only in the attachment region to which the piezoelectric element 30 is attached but also in any part of the panel 10. For this reason, the user can hear the human body vibration sound by bringing his / her ear into contact with an arbitrary position of the panel 10 in addition to the air conduction sound via air.

  The relaxation member 80 is disposed between the panel 10 and the piezoelectric element 30, and the piezoelectric element 30 and the relaxation member 80 are joined by the joining member 70. When the relaxation member 80 is disposed on the opposite side of the piezoelectric element 30 from the panel 10, the deformation of the piezoelectric element 30 is transmitted via the bonding member 70. On the other hand, when the relaxation member 80 is disposed between the panel 10 and the piezoelectric element 30, since the deformation of the piezoelectric element 30 is directly transmitted to the relaxation member 80, the bonding member between the piezoelectric element 30 and the relaxation member 80. There is an advantage that 70 interface peeling hardly occurs.

  Further, the relaxation member 80 is joined to the panel 10 by the joining member 70. Thereby, the relaxation member 80 can be attached to the panel 10 in a state in which the degree of freedom of deformation of the piezoelectric element 30 is difficult to be hindered. The joining member 70 can be a non-heating type curable adhesive. Thereby, there is an advantage that thermal stress shrinkage hardly occurs between the piezoelectric element 30 and the panel 10 at the time of curing. Moreover, the joining member 70 can be a double-sided tape. Thereby, there is an advantage that contraction stress is hardly applied between the piezoelectric element 30 and the panel 10 as in the case of using an adhesive.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each member, each step, etc. can be rearranged so that there is no logical contradiction, and a plurality of components, steps, etc. can be combined into one or divided. is there.

  For example, in the first embodiment and the second embodiment described above, the relaxation member 80 is a plate-like member, but the shape of the relaxation member 80 is not limited thereto. The relaxation member that can reduce the application of external force to the piezoelectric element 30 is, for example, larger than the piezoelectric element 30 and has a shape whose end is curved toward the piezoelectric element 30 and covers the side of the piezoelectric element 30. May be. In addition, the relaxation member may have a shape including, for example, a plate-like portion and an extending portion that extends from the plate-like portion and covers the side portion of the piezoelectric element 30. In this case, it is preferable that the extended portion and the side portion of the piezoelectric element are separated by a predetermined distance. Thereby, it becomes difficult for an extending part to inhibit a deformation | transformation of a piezoelectric element.

  For example, as illustrated in FIG. 7, the panel 10 may be configured to be bonded to the housing 60 by the bonding member 70. Thus, by making it difficult for the vibration from the panel 10 to be directly transmitted to the housing 60, it is possible to reduce the possibility that the user drops the electronic device 1 as compared with the case where the housing 60 itself vibrates greatly. The joining member 70 can be a non-heating type curable adhesive. Accordingly, there is an advantage that thermal stress shrinkage hardly occurs between the housing 60 and the panel 10 at the time of curing. Moreover, the joining member 70 can be a double-sided tape. Thereby, there exists an advantage that the shrinkage stress like the time of use of an adhesive agent does not generate | occur | produce between the housing | casing 60 and the panel 10 easily.

  For example, when the panel 10 and the display unit 20 are configured not to overlap each other, the piezoelectric element 30 may be disposed at the center of the panel 10. When the piezoelectric element 30 is disposed in the center of the panel 10, the vibration of the piezoelectric element 30 is evenly transmitted to the entire panel 10 to improve the quality of the air conduction sound, and the user can listen to various positions of the panel 10. The human body vibration sound can be recognized even if it is touched. Similar to the above-described embodiment, a plurality of piezoelectric elements 30 may be mounted.

  In the electronic device 1 described above, the piezoelectric element 30 is attached to the panel 10, but may be attached to a location different from the panel 10. For example, the piezoelectric element 30 may be attached to a battery lid that is attached to the housing 60 and covers the battery. Since the battery lid is often attached to a surface different from the panel 10 in the electronic device 1 such as a mobile phone, according to such a configuration, the user places a part of the body (for example, an ear) on the surface different from the panel 10. You can hear the sound by touching.

  Further, the panel 10 can constitute a part or all of any of a display panel, an operation panel, a cover panel, and a lid panel for making the rechargeable battery removable. In particular, when the panel 10 is a display panel, the piezoelectric element 30 is disposed outside the display area for the display function. As a result, there is an advantage that the display is hardly disturbed.

  FIG. 8 is an enlarged view of a part of the constituent members of the encircled portion in FIGS. 3 (b) and 5 (b). That is, in the bb cross-sectional views of FIGS. 3A and 5A, a part of the housing 60, the relaxation member 80, and the enlarged piezoelectric element 30 bonded to the relaxation member 80 by the joining member 70. Represents the figure. The relaxation member 80 has a contact portion 81 that protrudes in a direction facing the housing 60 on both sides thereof and that contacts the housing 60 when an external force is applied. The distance a from the top surface of the contact portion 81 to the surface of the housing 60 facing the top surface is such that the top surface of the piezoelectric element 30 bonded to the relaxing member 80 by the bonding member 70 is the surface of the housing 60 facing the book surface. It is configured to be smaller than the distance b to the surface. Therefore, when an external force is generated with respect to the electronic device 1, even when the relaxation member 80 that has received the external force moves, the contact portion 81 of the relaxation member 80 and the housing 60 come into contact with each other, whereby the piezoelectric element 30. Since the contact with the housing 60 can be reduced, the possibility that the piezoelectric element 30 is damaged can be reduced.

  Further, the contact portion 81 is configured with a certain interval so that the top surface does not come into contact with the housing 60 in a normal time when no external force is generated. Thus, when the piezoelectric element 30 vibrates, it is possible to reduce the vibration transmitted directly to the housing 60 via the relaxation member 80, and to prevent unintentional vibration conduction to the housing 60.

  The contact portion 81 is configured such that its top surface is lower than that of the piezoelectric element 30, but is not limited to this. If the contact portion 81 does not come into direct contact with the housing 60 at normal times when no external force is generated, the piezoelectric element The top surface may be higher than 30. With such a configuration, the higher the top surface, the greater the rigidity of the relaxation member 80. Therefore, the deformation of the relaxation member 80 is reduced, thereby reducing the breakage of the piezoelectric element 30 bonded to the relaxation member 80. can do.

  FIG. 9 is a diagram showing a first modification of FIG. The first modification is different from the embodiment of FIG. 8 in that the contact portion 81 of the relaxation member 80 is positioned higher than the top surface of the piezoelectric element 30 at the top surface. As a result, as in the embodiment of FIG. 8, a recess necessary for housing a part of the piezoelectric element 30 on the housing 60 side becomes unnecessary. In addition, since the side surface of the piezoelectric element 30 is protected by the contact portion 81 as compared with the embodiment of FIG. 8, it is possible to further reduce the damage of the piezoelectric element 30, and On the other hand, even when an external force is generated, the contact portion 81 that is higher than the top surface of the piezoelectric element 30 contacts the housing 60, so that the possibility that the housing 60 and the piezoelectric element 30 contact each other can be further reduced.

  FIG. 10 is an enlarged plan view of the relaxation member 80 and the piezoelectric element 30 of the electronic device 1 according to the first and second embodiments. The piezoelectric element 30 is bonded to a substantially central position of the relaxation member 80 by the bonding member 70, and the periphery thereof is surrounded by the contact portion 81 of the relaxation member 80. That is, the contact portion 81 is configured in a frame shape surrounding the piezoelectric element 30 at the periphery of the position where the piezoelectric element 30 is provided. Further, the contact portion 31 is configured to be substantially parallel to the piezoelectric element 30.

  Therefore, by making the relaxation member 80 into a frame shape, the deformation thereof is suppressed, the deformation of the piezoelectric element 30 joined to the relaxation member 80 can also be suppressed, and damage to the piezoelectric element 30 can be reduced. .

  In addition, the piezoelectric element 30 is configured to be separated from the abutting portion 81, whereby the abutting portion 81 can be prevented from inhibiting the vibration of the piezoelectric element 30.

  In addition, the contact part 81 is not restricted to what is provided continuously as shown in FIG. 9, For example, the structure which has a convex shape for every fixed space | interval may be sufficient. Moreover, the contact part 81 may be provided in a rail shape that is provided only in the longitudinal direction and not in the lateral direction, and deformation of the piezoelectric element 30 in the longitudinal direction can be reduced.

  FIG. 11 is a diagram showing a second modification of FIG. The second modification differs from the embodiment of FIG. 8 in that, instead of providing the contact portion 81 on the relaxation member 80, the contact portion 61 that protrudes in the direction facing the relaxation member 80 is provided on the housing 60. Is. The distance c from the top surface of the contact portion 61 to the surface of the relaxing member 80 facing the contact portion 61 is the distance from the top surface of the piezoelectric element 30 to the surface of the housing facing the top surface of the piezoelectric element 30. It is configured to be smaller than d.

  Therefore, when an external force is generated with respect to the electronic device 1, it is possible to reduce the contact between the piezoelectric element 30 and the housing 60 by bringing the relaxation member 80 into contact with the contact portion 61. Can be reduced.

FIG. 12 is a diagram showing a third modification of FIG. The third modification is different from the embodiment of FIG. 8 in that a contact member 100 is provided around the piezoelectric element 30 instead of providing the relaxation member 80 between the panel 10 and the piezoelectric element 30. For example, the contact member 100 is configured in a frame shape surrounding the periphery of the piezoelectric element 30, and is bonded to the panel 10 by the bonding member 70.
Further, the contact member 100 is configured such that its top surface is higher than the top surface of the piezoelectric element 30.

  Thereby, when an external force is generated with respect to the electronic apparatus 1, the contact member 100 is in contact with the housing 60, so that damage to the piezoelectric element 30 can be reduced. Further, since the relaxation member 80 is not provided as compared with the embodiment of FIG. 8, the second modification, and the third modification, the number of parts can be reduced by the amount of the relaxation member 80. Further, in the manufacturing process, the contact member 100 can be bonded after the piezoelectric element 30 is bonded to the panel 10, and the manufacturing process can be simplified. Further, as a further modification of the third modification, a contact member may be box-shaped and a roof covering the top surface of the piezoelectric element 30 may be provided. According to the further modification, when an external force is generated, Further, the contact of the piezoelectric element 30 with the housing 60 can be reduced, and the possibility of damage to the piezoelectric element 30 can be reduced.

  Further, in a normal time when no external force is applied, the contact portion 81 of the relaxation member 80 may be in contact with the housing 60, and nothing may be interposed between the contact portion 81 and the housing 60. Alternatively, an elastic member such as a sponge may be interposed. The same applies to the contact portion 61 and the relaxation member 80 of the housing 60 and between the contact member 100 and the housing 60.

  Further, in the electronic device 1, the contact portion 61 may be provided on the housing 60 and the contact portion 81 may be provided on the relaxation member 80, and when an external force is generated, the contact portion 61 (the housing 60 side). The contact portion 81 (relaxation member 80 side) may be in contact with the contact portion 81.

DESCRIPTION OF SYMBOLS 1 Electronic device 10 Panel 20 Display part 30 Piezoelectric element 40 Input part 50 Control part 60 Housing | casing 61 Contact part (case side)
70 Joining member 80 Relaxing member 81 Contact part (relaxation member side)
90 support part 100 contact member

Claims (10)

A panel,
A piezoelectric element;
A housing to which the panel is attached;
A relaxation member that is attached to the piezoelectric element and relaxes external force transmitted to the piezoelectric element;
The relaxation member has a relaxation member side contact portion that is in contact with the housing when at least an external force is applied,
An electronic apparatus that transmits air conduction sound and human body vibration sound to an object that contacts the deforming panel when the relaxation member and the panel are deformed due to deformation of the piezoelectric element. The electronic device according to claim 1, wherein the contact portion is provided around a position where the piezoelectric element is attached, and protrudes compared to a surface where the piezoelectric element is attached. The housing has a housing-side contact portion that contacts the relaxation member-side contact portion when at least an external force is applied;
The electronic device according to claim 1, wherein the housing-side contact portion protrudes toward the relaxation member side.   The electronic device according to claim 1, wherein the contact portion is separated from the piezoelectric element.   The electronic device according to claim 1, wherein the contact portion is configured to surround the piezoelectric element attached to the relaxation member.   The electronic device according to claim 1, wherein the contact portion is provided at a peripheral edge of a position where the piezoelectric element is attached.   The electronic device according to any one of claims 1 to 6, wherein the contact portion is continuously provided in a direction substantially the same as a longitudinal direction of the piezoelectric element.   The electron according to any one of claims 1 to 7, wherein a distance from the contact portion to the housing facing the contact portion is smaller than a distance from the piezoelectric element to the housing facing the piezoelectric element. machine. A panel,
A piezoelectric element;
A housing to which the panel is attached;
An abutting member attached around the piezoelectric element and abutting on the housing when at least an external force is applied;
An electronic device that transmits an air conduction sound and a human body vibration sound to an object that contacts the deforming panel when the panel is deformed due to deformation of the piezoelectric element.   The electronic device according to claim 9, wherein the contact member is configured to surround a periphery of the piezoelectric element.

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