JP2013232845A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus which may be properly used for a type of electronic apparatus which vibrates a panel attached to a housing.SOLUTION: The electronic apparatus includes: a piezoelectric element; a panel to which the piezoelectric element is fixed, the panel which is vibrated by the piezoelectric element and generates air conduction sounds and vibration sounds transmitted by vibrating a part of a human body; a housing supporting the panel; and a mounting part on which a microphone is mounted and fixed to the housing. The electronic apparatus attenuates vibrations transmitted from the panel to a periphery of the microphone through the housing and reduces noise and echos that the microphone collects.

Description

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

  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 bone conduction sound is sound transmitted to the user's auditory nerve through a part of the user's body (for example, 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. And air conduction sound and 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 a piezoelectric element, a panel to which the piezoelectric element is fixed, vibrated by the piezoelectric element, and generates air conduction sound and vibration sound transmitted by vibrating a part of a human body. It has a housing to be supported and a mounting portion on which a microphone is mounted and fixed to the housing.

  The electronic device further includes, for example, a rubber-made buffer portion that is disposed between the mounting portion and the housing and cushions vibrations of the housing transmitted from the panel.

  The mounting portion may be disposed on a second side opposite to the first side on which the piezoelectric element is disposed in a plan view of the housing.

  The mounting portion is disposed on a second main surface opposite to the first main surface on which the panel of the housing is supported. In that case, the microphone arranged on the second main surface collects sound for removal from the sound collected by the microphone further arranged on the first main surface side. . The first microphone is disposed on a first side on which the piezoelectric element is disposed in a plan view of the housing, and the second microphone is disposed on a second side opposite to the first side. May be arranged. An imaging unit may be further mounted on the mounting unit.

  The length in the direction from the side where the piezoelectric element is arranged to the opposite side in a plan view of the panel is preferably equal to or longer than the length from the antitragus to the lower leg of the antiaural ring. Moreover, the length of the direction which cross | intersects the said direction is good in it being more than the length from an tragus to an earring.

  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 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, microphones 42_1 and 42_2, a communication unit 44, an imaging device 46, 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 the transmitted light 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 by the control unit 50 to the piezoelectric element 30 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 vibration sound. It's okay. 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, Vibrating sound can be generated 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 also generates vibration sound through a part of the body when the user contacts a part of the body (for example, cartilage of the outer ear). For example, the control unit 50 may apply an electric 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 vibration sound corresponding to the audio signal. it can. 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 receives a baseband signal from the electronic device of the other party through wireless communication and extracts a voice signal. The extracted audio signal is output as air conduction sound or vibration sound from the panel 10 by the control unit 50. Further, the communication unit 44 converts the audio signal collected by the microphone 42_1 into a baseband signal, and transmits the baseband signal to the electronic device of the other party.

  For example, as the main microphone, the microphone 42 </ b> _ 1 collects the voice of a call made by the user, converts it into a voice signal, and inputs the voice signal to the control unit 50. The microphone 42_2, for example, as a sub microphone, collects ambient environmental sounds, converts them into audio signals, and inputs them to the control unit 50. In this case, the control unit 50 performs noise cancellation by subtracting the environmental sound collected by the sub-microphone 42_2 from the sound collected by the main microphone 42_1.

  The imaging unit 46 includes, for example, an image sensor such as a charge coupled device (CCD) or a complementary MOS (CMOS), and a signal processing circuit that processes pixel signals generated by imaging. The imaging unit 46 performs imaging in response to a control signal from the input unit 40 and sends captured image data to the control unit 50. The control unit 50 outputs the captured image data to the display unit 20 or stores it in a storage medium built in or attached to the electronic device 1.

  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. The panel 10 vibrates at a certain moment, with a portion having a relatively large vibration amplitude and a portion having a relatively small vibration amplitude distributed randomly or periodically in a wide area of the panel 10. That is, a plurality of wave vibrations can be detected over a wide area (for example, substantially the entire area) of the 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 vibration sound via 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 vibration sound due to the vibration of the panel 10, even if the user wears an earphone or a headphone, for example, the user can touch the electronic device 1 to contact the earphone or the headphone. Sounds can be heard 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, FIG. 3B is a rear view, and FIG. 3C is a cross-sectional view taken along line bb in FIGS. 3A and 3B. The electronic device 1 shown in FIGS. 3A to 3C 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 front surface illustrated in FIG. 3A corresponds to the “first main surface” of the housing 60, and the back surface illustrated in FIG. 3B 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_1 is mounted on the mounting portion 43_1, and the mounting portion 43_1 is disposed and fixed to the lower portion of the panel 10 on the front surface of the housing 60. At that position, the microphone 42_1 functions as a main microphone that collects the sound emitted by the user. On the other hand, the microphone 42_2 is mounted on the mounting portion 43_2, and the mounting portion 43_2 is disposed and fixed on the rear surface of the housing 60. At that position, the microphone 42_2 functions as a sub-microphone that collects ambient environmental sounds. The mounting portions 43_1 and 43_2 are both formed of a material such as resin or metal as a separate body from the housing 60. The mounting portions 43_1 and 43_2 are provided with sound collecting holes 42a. The hole 42a is waterproofed by a waterproof sheet (eg, Gore-Tex (registered trademark)) (not shown). The microphones 42_1 and 42_2 collect sound through the holes 42a. The microphones 42_1 and 42_2 are connected to the circuit board 50a in the housing 60.

  The microphones 42 </ b> _ <b> 1 and 42 </ b> _ <b> 2 are mounted on the mounting portions 43 </ b> _ <b> 1 and 43 </ b> _ 2, respectively, and the mounting portions 43 </ b> _ <b> 1 and 43 </ The vibration is attenuated by passing through the mounting portions 43_1 and 43_2 that are separate from the housing 60, and is not easily transmitted directly to the microphones 42_1 and 42_2. Therefore, it is possible to suppress abnormal noise generated by vibration of the casing 60 and the microphone peripheral portion and sound leakage of the call voice. Therefore, noise collected by the microphones 42_1 and 42_2 and sound return (echo) of the call voice can be reduced. In particular, the microphone 42_2 as a sub-microphone can efficiently collect the environmental sound without the surrounding environmental sound that should be collected by the microphone 42_2 being buried in the vibration sound of the housing 60 or the like. . Therefore, it is possible to perform noise cancellation processing with high accuracy.

  Further, preferably, a buffer unit 45 is provided between the mounting units 43_1 and 43_2 and the housing 60. The buffer part 45 is made of rubber, for example. Thereby, the vibration transmitted from the housing 60 to the mounting portions 43_1 and 43_2 can be further attenuated. Therefore, noise collected by the microphones 42_1 and 42_2 and sound return (echo) of the call voice can be reduced.

  3C shows an example in which the mounting portion 43_2 is disposed near the upper portion 60a of the housing 60. Such an arrangement is suitable for collecting ambient environmental sounds because the user is displaced from the position of the hand holding the housing 60. However, the mounting portion 43_2 may be disposed near the lower portion 60b of the housing 60. Here, the upper portion 60a and the lower portion 60b of the housing 60 are defined with the midpoint of the length of the housing 60 in the longitudinal direction as a boundary. For example, the piezoelectric element 30 is provided in the upper part 60a. On the other hand, the mounting portion 43_2 is disposed on the lower portion 60b side of the rear surface of the housing 60. In such a case, the distance from the piezoelectric element 30 that is a vibration generation source can be increased, and an effect of further damping the vibration transmitted from the panel 10 through the housing to the mounting portion 43_2 can be obtained.

  Note that the imaging unit 46 can be mounted on the mounting unit 43_2. By doing so, the imaging unit 46 can also be used as a part for fixing the imaging unit 46 to the housing 60, and the number of parts can be reduced and the cost can be reduced. Moreover, by mounting the imaging unit 46, the rigidity of the mounting unit 43_2 as a whole can be improved, and vibration can be further damped.

  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 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_1. As a result, noise and echo collected by the microphone 42_1 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 vibration sound to it. Accordingly, air conduction sound and vibration sound can be transmitted to the user without causing the vibrating body to protrude from the outer surface of the housing 60, so that a very small vibrating body compared to the housing is brought into contact with the human body. The usability is improved as compared with the electronic device described in 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. 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 (for example, an 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 FIG. 6, a microphone 42 </ b> _ <b> 2 as a sub microphone provided on the back surface of the housing 60 is shown. The main microphone 42_1 is provided on the side of the casing 61 that is folded in a pair with the casing 60, for example. Similarly to the first embodiment, the microphone 42_2 is mounted on the mounting portion 43_2 and fixed to the housing 60. More preferably, the buffer part 45 is provided between the mounting part 43_2 and the housing 60. By adopting such a configuration, it is possible to collect ambient environmental sound by reducing noise and echo originating from the housing 60 that the microphone 42_2 collects sound, and efficient noise cancellation becomes possible.

  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, the user can hear the vibration sound by bringing his / her ear into contact with an arbitrary position of the panel 10 in addition to the air conduction sound through the air.

  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 vibration sound are transmitted to the object that contacts the panel 10. Thereby, the air conduction sound and the 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 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 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 vibration sound by bringing his / her ear into contact with an arbitrary position of the panel 10 in addition to the air conduction sound through the 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 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 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 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 40 Input part 42_1, 42_2 Microphone 43_1, 43_2 Mount part 44 Communication part 46 Imaging part 50 Control part 60 Housing | casing 70 Joining member 80 Reinforcement member 90 Support part

Claims (18)

A 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;
A mounting portion on which a microphone is mounted and fixed to the housing;
Electronic equipment having In claim 1,
An electronic apparatus further comprising a buffer unit that is disposed between the mounting unit and the housing and cushions vibrations of the housing transmitted from the panel. In claim 2,
The buffer portion is made of rubber.
Electronics. In any one of Claims 1 thru | or 3,
The mounting unit is an electronic device disposed on a second side opposite to the first side on which the piezoelectric element is disposed in a plan view of the housing. In any one of Claims 1 thru | or 4,
The mounting portion is an electronic device disposed on a second main surface opposite to the first main surface on which the panel of the housing is supported. In claim 5,
The electronic device is an electronic device that is a second microphone that collects sound for removal from sound collected by a first microphone that is further arranged on the first main surface side. In claim 6,
The first microphone is disposed on a first side where the piezoelectric element is disposed in a plan view of the housing, and the second microphone is disposed on a second side opposite to the first side. Electronic equipment. In claim 5,
An electronic device in which an imaging unit is further mounted on the mounting unit. In any one of Claims 1 thru | or 8.
The length in the direction from the side on which the piezoelectric element is arranged in the plan view of the panel to the opposite side is equal to or longer than the length from the antitragus to the lower leg of the antiaural ring,
Electronics. In any one of Claims 1 thru | or 9,
The length in the direction intersecting with the direction from the side where the piezoelectric element is arranged in the plan view of the panel to the opposite side is equal to or longer than the length from the tragus to the antiaural ring,
Electronics. In any one of Claims 1 thru | or 10.
The piezoelectric element is bonded to the panel by a bonding member.
Electronics. In claim 11,
The joining member is a non-heating type curable adhesive,
Electronics. In claim 11,
The joining member is a double-sided tape,
Electronics. In any one of Claims 1 thru | or 13.
The panel is joined to the housing by a joining member.
Electronics. In claim 14,
The joining member is a non-heating type curable adhesive,
Electronics. In claim 14,
The joining member is a double-sided tape,
Electronics. In any one of Claims 1 thru | or 16.
The panel constitutes a part or all of the display unit, the input unit, the cover of the display unit,
Electronics. In any one of Claims 1 thru | or 16.
The bonding portion of the piezoelectric element in the panel is located outside the overlapping region of the panel and the display unit,
Electronics.

Images