JP5957279B2 - Electronics - Google Patents

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.

  In the telephone set described in Patent Document 1, it is described that a short plate-like vibrating body made of a piezoelectric bimorph and a flexible material is attached to the outer surface of a housing via an elastic member. Further, in Patent Document 1, when a voltage is applied to the piezoelectric bimorph of the vibrating body, the vibrating body bends and vibrates as the piezoelectric material expands and contracts in the longitudinal direction, and the user contacts the vibrating body with the auricle. It is described that air conduction sound and human body vibration sound are transmitted to the user.

JP 2005-348193 A

  In the electronic device described in Patent Document 1, a vibrating body is attached to the outer surface of a housing such as a mobile phone. For this reason, no consideration has been given to problems when the panel attached to the housing is vibrated.

  The objective of this invention is providing the electronic device which can be used appropriately also for the electronic device of the type which vibrates the panel attached to a housing.

An electronic apparatus according to the present invention includes an elongated piezoelectric element, a panel to which the piezoelectric element is fixed, and which vibrates by the piezoelectric element to generate air conduction sound and vibration sound transmitted by vibrating a part of the human body. a housing for supporting the panel in the first main surface, wherein while being housed in a casing, and a microphone disposed in a different second main surface from said first major surface, said from the panel an electronic apparatus having a buffer portion of weakening the vibration transmitted through the first main surface and / or the second main surface to the microphone,
The panel is bent by the piezoelectric element so that a portion directly above the piezoelectric element rises in the longitudinal direction of the piezoelectric element in the longitudinal direction, and the contact area of the ear contacting the panel is increased. It is characterized by transmitting sound by vibrating .

  The first main surface and the second main surface are opposed to each other, the buffer portion is provided in the housing, and the electronic device is configured so that the microphone is provided from the first side on which the panel is provided in the housing. It is good to have the rib extended in the direction which cross | intersects the direction which goes to the 2nd side provided.

  The electronic device may include a vibration absorbing member between the microphone in the housing and the second main surface.

  The buffer portion may be provided in the housing and have a sound insulating wall surrounding the microphone.

  The piezoelectric element may be fixed closer to the first side in a direction from the first side to the second side of the panel.

  The panel may include a display unit disposed closer to the microphone from a fixed position of the piezoelectric element in a plan view.

  The length of the panel in the direction from the first side to the second side is preferably not less than the length from the antitragus to the lower leg of the antiaural ring. The length in the direction intersecting with the direction from the first side to the second side is preferably equal to or longer than the length from the tragus to the antiaural ring.

  The piezoelectric element may be bonded to the panel by a bonding member. Furthermore, the joining member may be a non-heating type curable adhesive or a double-sided tape.

  The panel may be bonded to the housing by a bonding member. Furthermore, the joining member may be a non-heating type curable adhesive or a double-sided tape.

  The panel may include a display unit disposed closer to the microphone from a fixed position of the piezoelectric element in a plan view.

  The panel may constitute part or all of any one of a display unit, an input unit, and a cover of the display unit.

  The joining portion of the piezoelectric element in the panel may be located outside an overlapping region between the panel and the display unit.

  The electronic device according to the present invention can also be appropriately used for an electronic device of a type that vibrates a panel attached to the housing.

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 the modification in 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.

  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, a microphone 42, a communication unit 44, 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 may be disposed apart from the panel 10 and supported by the housing of the electronic device 1. In a preferred example, the display unit 20 is bonded to the back surface of the panel 10 by a bonding member (for example, an adhesive). The joining member is, for example, an elastic resin such as an optical elastic resin in which the refractive index of light to be transmitted is controlled. The display unit 20 displays various information through the adhesive member and the panel 10. By bonding the display unit 20 to the back surface of the panel 10, the attenuation of vibration of the panel 10 can be adjusted as will be described later.

  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. Thereby, even when the user presses the panel 10 against his / her body with a force of 3N or more (for example, a force of 5N to 10N), the panel 10 is caused to generate sufficient vibrations, 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 applies an electrical signal corresponding to the audio signal related to the voice of the communication partner received by the communication unit 44 to the piezoelectric element 30 to generate air conduction sound and human body vibration sound corresponding to the audio signal. Can do. 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 communication unit 44 converts the audio signal collected by the microphone 42 into a baseband signal and transmits the baseband signal to the electronic device of the other party. In addition, the communication unit 44 receives a baseband signal from the electronic device of the other party by wireless communication, and extracts a voice signal. The extracted audio signal is output from the panel 10 as an air conduction sound or a bone conduction sound by the control unit 50.

  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. Here, the length direction is the longitudinal direction 2a in which the panel 10 extends, and the piezoelectric element 30 is disposed closer to one end from the center. The width direction is a direction 2b orthogonal to the longitudinal direction.

  The region having such a length and width may be a rectangular region, or may be an elliptical shape having the above length as the major axis and the 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. By having the dimensions and shapes as described above, the panel 10 can cover the user's ears and is tolerant of misalignment when applied to the ears.

  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 FIGS. 3B to 3D are cross-sectional views taken along the line bb in FIG. 3A. The electronic device 1 illustrated in FIGS. 3A to 3D is a smartphone in which a touch panel that is a glass plate is disposed on the front surface of a housing 60 (for example, a metal or resin case) as the panel 10. The front surface shown in FIG. 3A corresponds to the “first main surface” of the housing 60, and the back side corresponds to the “second main surface”.

  The panel 10 and the input unit 40 are supported by a housing 60, and the display unit 20 and the piezoelectric element 30 are bonded to the panel 10 by a joining member 70, respectively. 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 control unit 50 is mounted on a circuit board 50 a provided on the back side of the panel 10 and the display unit 20.

  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.

  The microphone 42 is disposed at the lower part of the panel 10. The microphone 42 collects external sound through a sound collecting hole 42 a provided on the front surface of the housing 60. The hole 42a is waterproofed by a waterproof sheet (eg, Gore-Tex (registered trademark)) (not shown). The microphone 42 a is connected and fixed to a circuit board 50 b provided on the back side in the housing 60.

  In the housing 60, a buffer unit 31 is provided between the panel 10 and the microphone 42 to attenuate the vibration B <b> 1 transmitted from the panel 10 toward the microphone 42 on the front surface of the housing 60 and / or the vibration B <b> 2 transmitted on the back surface. The buffer part 31 is provided between, for example, the rib 34 provided in the housing 60, the circuit board 50b, and the rear surface side of the housing housing 60, and either or both of the vibration absorbing members 36 bonded to both of them. including. In addition to this, the housing 60 may be provided with a sound insulating wall 32 surrounding the microphone 42.

  The ribs 34 extend in a short direction that intersects the longitudinal direction from the upper side of the casing 60 where the panel 10 is provided toward the lower side of the casing 60 where the microphone 42 is provided. As shown in FIG. 3B, the rib 34 is provided integrally or separately with the housing 60 on either the front inner side or the rear inner surface of the housing 60, and has a height that makes contact with the other. . The ribs 34 are formed of the same material as the housing 60, such as resin or metal. Further, the length of the rib 34 in the extending direction, that is, the length in the short direction of the housing 60 is preferably equal to the short direction of the housing 60. Such a rib 34 can be divided into a two-chamber structure by separating the upper side 60a and the lower side 60b of the housing 60 as separate chambers. By doing so, the vibrations B1 and B2 transmitted from the upper side 60a to the lower side 60b on the front side and / or the back side of the housing 60 when the panel 10 vibrates by the piezoelectric element 30 can be attenuated. Thereby, in the lower side 60b, the sound generated by the vibration of the substrate and other components in the vicinity of the microphone 42 of the housing 60 can be suppressed. Therefore, noise mixed in the call voice can be reduced. Alternatively, it is possible to suppress so-called sound return (echo) in which call voice generated by the vibration of the panel 10 is collected by the microphone 42 and returned to the call partner.

  In addition, the case where the height of the rib 34 does not reach from the front inner side to the rear inner side of the housing 60 is also included in the scope of the present invention. For example, as shown in FIG. 3C, the rib 34 is provided on the front inner side of the housing 60 to increase the rigidity of the portion, and the front side of the housing 60 is changed from the upper side 60a to the lower side 60b. The transmitted vibration B1 can be damped. Alternatively, as shown in FIG. 3D, the rib 34 can be provided on the inner side of the rear surface of the housing 60 to increase the rigidity of the portion, and the rear surface side of the housing 60 is changed from the upper side 60a to the lower side 60b. The transmitted vibration B2 can be attenuated.

  The vibration absorbing member 36 is fixed to the inside of the back surface of the circuit board 50b and the housing 60 by bonding with an adhesive or a double-sided tape. The vibration absorbing member 36 is a foam material such as sponge. By providing the vibration absorbing member 36, it is possible to absorb the vibration B2 transmitted from the back side of the housing 60 to the substrate 50b provided with the microphone 42, and reduce the sound generated by the vibration of the substrate 50b. Therefore, noise collected by the microphone 42 can be reduced.

  The sound insulation 32 provided around the microphone 42 is made of rubber, for example. The sound insulation wall 32 is preferably provided so as to surround the entire circumference of the microphone 42. However, one or more places may be separated. In addition, here, a case where the shape of the sound insulating wall 32 in a plan view is circular is illustrated, but the shape is not limited thereto. Furthermore, the height of the sound insulation wall 32 is preferably such that the upper part is in contact with the front inner side of the housing 60. However, even if the height is less than this, it is included in the scope of the present invention. By providing the sound insulating wall 32, even if the casing 60 or various circuit components accommodated in the panel 10 vibrate due to the vibration of the panel 10 and sound is generated, the sound propagation in the internal space of the casing 60 can be blocked. . Therefore, noise and echo collected by the microphone 42 can be reduced.

  FIG. 4 shows a modification of the buffer unit 31. 4A and 4B show examples of the shape of the rib 34 in plan view. The extension direction of the ribs 34, that is, the length in the short direction of the casing 60 is shown in FIG. 3A as being the same as the short direction of the casing 60. For example, FIG. Thus, the rib 34 may be bent so as to have a portion extending in the longitudinal direction of the housing 60, or the rib 34 may be provided intermittently as shown in FIG. Further, as shown in the case of FIG. 4A, for example, the rib 34 surrounds the microphone 42 so that the microphone 42 can be isolated from other parts of the housing 60, and vibration transmitted to the microphone 42. Can be weakened.

  FIG. 4C shows an example of the shape of the rib 34 in the bb cross section. The ribs 34 may be bent in the height direction. By doing so, the freedom degree of arrangement | positioning of the circuit components etc. in the housing | casing 60 can be raised.

  FIG. 5 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 apparatus 1 according to the first embodiment, the piezoelectric element 30 is provided on the upper part of the panel 10, and 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. 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. Further, the vibration in the panel 10 can be sufficiently damped in the vicinity of the microphone 42. As a result, noise and echo collected by the microphone 42 can be reduced.

  As described above, according to the electronic apparatus 1 according to the present embodiment, the panel 10 is deformed due to the deformation of the piezoelectric element 30 attached to the back surface of the panel 10, and the object that contacts the deformed panel 10 is detected. It conveys air conduction sound and human body vibration sound. Accordingly, since the air conduction sound and the human body vibration sound can be transmitted to the user without causing the vibration body to protrude from the outer surface of the housing 60, a patent that makes a vibration body that is much smaller than the housing contact the human body. Usability is improved as compared with the electronic device described in Document 1. 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.

  The piezoelectric element 30 is joined to the panel 10 by a joining member 70. Thereby, the piezoelectric element 30 can be attached to the panel 10 in a state in which the degree of freedom of deformation of the piezoelectric element 30 is hardly 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.

(Second Embodiment)
FIG. 6 is a diagram illustrating a mounting structure of the electronic device 1 according to the second embodiment. 6 (a) is a front view, FIG. 6 (b) is a cross-sectional view taken along line bb in FIG. 6 (a), and FIG. 6 (c) is taken along line cc in FIG. 6 (a). It is sectional drawing. The electronic device 1 shown in FIG. 6 is a foldable mobile phone in which a cover panel (acrylic plate) that protects the display unit 20 as the panel 10 is arranged on the front surface of the upper housing 60. In the second embodiment, a reinforcing member 80 is disposed between the panel 10 and the piezoelectric element 30. The reinforcing member 80 is a resin plate including, for example, a resin plate, sheet metal, or glass fiber. That is, the electronic device 1 according to the second embodiment has a structure in which the piezoelectric element 30 and the reinforcing member 80 are bonded by the bonding member 70, and the reinforcing 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.

  In the configuration shown in FIG. 6, even when the microphone 42 is provided in the housing 60, as in the first embodiment, one or both of the buffer portion 31 including the rib 34 and the vibration absorbing member 36 and the sound insulating wall 32 are provided. Can be provided. By doing so, noise and echo collected by the microphone 42 can be reduced.

  FIG. 7 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, 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. Even in this case, noise and echoes collected by the microphone 42 can be reduced by providing the buffer portion 31 including the rib 34 and / or the vibration absorbing member 36 and the sound insulating wall 32 around the microphone 42.

  As described above, according to the electronic apparatus 1 according to the present embodiment, the reinforcing member 80 and the panel 10 are deformed due to the deformation of the piezoelectric element 30 attached to the panel 10 via the reinforcing member 80, and the deformation is performed. The air conduction sound and the human body vibration sound are transmitted to the object in contact with the panel 10. Thereby, the air conduction sound and the human body vibration sound can be transmitted to the user without placing the vibration body itself on the ear. The piezoelectric element 30 is attached to the surface of the panel 10 on the inside of the housing 60. For this reason, 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, 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.

  Further, by arranging the reinforcing member 80 between the piezoelectric element 30 and the panel 10, for example, when an external force is applied to the panel 10, the external force is transmitted to the piezoelectric element 30 and the piezoelectric element 30 may be damaged. Can be reduced. Moreover, even if the panel 10 is brought into strong contact with the human body, the vibration of the panel 10 can be hardly attenuated. Further, by disposing the reinforcing member 80 between the piezoelectric element 30 and the panel 10, the resonance frequency of the panel 10 is lowered, and the acoustic characteristics in the low frequency band are improved. Instead of the reinforcing member 80, a plate-like weight may be attached to the piezoelectric element 30 by the joining member 70.

  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, as shown in FIG. 8, the panel 10 may be configured to be joined to the housing 60 by a joining 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 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. The operation panel includes the touch panel of the first embodiment. In addition, the operation panel includes a sheet key that is a member that constitutes one surface of the operation unit side body, in which, for example, a key top of an operation key is integrally formed in a foldable mobile phone.

  In the first embodiment and the second embodiment, the bonding member that bonds the panel 10 and the piezoelectric element 30, the bonding member that bonds the panel 10 and the housing 60, and the like have the same reference numerals. As explained. However, the joining member used in the first embodiment and the second embodiment may be appropriately different depending on the member to be joined.

DESCRIPTION OF SYMBOLS 1 Electronic device 10 Panel 20 Display part 30 Piezoelectric element 31 Buffer part 32 Sound insulation wall 34 Rib 36 Vibration absorption member 40 Input part 42 Microphone 50 Control part 60 Case 70 Joining member 80 Reinforcement member 90 Support part

Claims (16)

A long piezoelectric element;
A panel in which the piezoelectric element is fixed and vibrates by the piezoelectric element to generate air conduction sound and vibration sound transmitted by vibrating a part of the human body;
A housing for supporting the panel in the first main surface,
A microphone housed in the housing and disposed on a second main surface different from the first main surface;
A buffer unit to attenuate vibration transmitted through said from the panel to the microphone first main surface and / or the second main surface,
An electronic device having a,
The panel is bent by the piezoelectric element so that a portion directly above the piezoelectric element rises in the longitudinal direction of the piezoelectric element in the longitudinal direction, and the contact area of the ear contacting the panel is increased. Electronic devices that transmit sound by vibration . In claim 1,
The faces and the first main surface and the second main surface,
The buffer portion is provided in the housing, and has a rib extending in a direction intersecting with a direction from the first side where the panel is provided in the housing to the second side where the microphone is provided.
Electronics. In claim 1 or 2,
A vibration absorbing member is provided between the microphone and the second main surface in the housing.
Electronics. In any one of Claims 1 thru | or 3,
A sound insulation wall provided in the housing and surrounding the microphone;
Electronics. Oite to claim 2,
The piezoelectric element is fixed from the first side of the panel to the first side closer in a direction toward the second side,
Electronics. In any one of Claims 1 thru | or 5,
The panel is an electronic apparatus having a display unit disposed near the microphone from a fixed position of the piezoelectric element in a plan view. Oite to claim 2 or 5,
Length in the direction toward the second side from the first side of the panel, from the antitragus to antihelix under legs is more than the length,
Electronics. In claim 2, 5 or 7 ,
The length in the direction orthogonal to the direction toward the second side from the first side of the panel is greater than or equal to the length of the tragus to antihelix,
Electronics. In any one of Claims 1 thru | or 8.
The piezoelectric element is bonded to the panel by a bonding member.
Electronics. In claim 9,
The joining member is a non-heating type curable adhesive,
Electronics. In claim 9,
The joining member is a double-sided tape,
Electronics. In any one of Claims 1 thru | or 8.
The panel is joined to the housing by a joining member.
Electronics. In claim 12,
The joining member is a non-heating type curable adhesive,
Electronics. In claim 12,
The joining member is a double-sided tape,
Electronics. In any one of Claims 1 thru | or 14.
The panel constitutes a part or all of the display unit, the input unit, the cover of the display unit,
Electronics. In claim 6 or 15 ,
The bonding portion of the piezoelectric element in the panel is located outside the overlapping region of the panel and the display unit,
Electronics.

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