JP2015185967A - Acoustic generator and acoustic generation device including the same, electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an acoustic generator of excellent sound quality, and to provide an acoustic generation device including the same, and an electronic apparatus.SOLUTION: An acoustic generator 1 includes a piezoelectric element 11 as an exciter, a diaphragm 12 to which a piezoelectric element 11 is attached, and which is oscillated together with the piezoelectric element 11 by the oscillation thereof, and a frame 13 bonded to a periphery of the diaphragm 12 for supporting the diaphragm 12. The frame 13 is divided, in the circumferential direction, into a plurality of frame members and bonded to each other.

Description

  The present invention relates to a sound generator, a sound generation apparatus including the sound generator, and an electronic apparatus.

  Conventionally, it is known that an acoustic generator represented by a piezoelectric speaker can be used as a small and thin speaker. Such sound generators are used by being incorporated in electronic devices such as mobile phones and flat-screen televisions.

  As such an acoustic generator, for example, a frame, a diaphragm installed on the frame, and a piezoelectric element on the diaphragm are known (see, for example, Patent Document 1).

JP 2013-162141 A

  In sound generators, further improvement in sound quality is required.

  The present invention has been devised in view of the above problems, and an object of the present invention is to provide a sound generator with good sound quality, a sound generator including the sound generator, and an electronic apparatus.

  An acoustic generator according to the present invention includes an exciter, the exciter attached thereto, a diaphragm that vibrates with the exciter by vibration of the exciter, and the diaphragm that is joined to an outer peripheral portion of the diaphragm. And a frame body that supports a plurality of frame members that are joined to each other in the circumferential direction.

  Moreover, the acoustic generator of the present invention is characterized in that, in the above configuration, the frame body is rectangular.

  In the acoustic generator of the present invention, in the configuration described above, the plurality of frame members respectively constitute sides of the rectangular frame, and two frames adjacent to each other at the rectangular corners. The members are joined.

  In the acoustic generator of the present invention, the frame body is provided along the outer peripheral portion of the one main surface side frame member disposed along the outer peripheral portion of the one main surface of the diaphragm and the other main surface of the diaphragm. The other main surface side frame member, and the bonding portion of the one main surface side frame member and the other main surface side frame member when viewed from a direction perpendicular to the one main surface of the diaphragm. It is characterized by being different from the part.

  In the acoustic generator of the present invention, the frame body is made of glass in the above configuration.

  The acoustic generator of the present invention is characterized in that, in the above configuration, the frame body is made of metal.

  The acoustic generator of the present invention is characterized in that, in the above configuration, the frame body is made of resin.

  According to another aspect of the present invention, there is provided an acoustic generator including the acoustic generator having the above-described configuration and a housing that accommodates the acoustic generator.

  According to another aspect of the invention, there is provided an electronic device comprising: the acoustic generator having the above configuration; an electronic circuit connected to the acoustic generator; and a housing that houses the electronic circuit and the acoustic generator. It is the electronic device which has the function to generate sound from.

  According to the present invention, the sound quality of the sound generator can be improved.

(A) is a schematic plan view which shows an example of embodiment of the acoustic generator of this invention, (b) is an AA line schematic sectional drawing shown to (a). (A) is a schematic plan view which shows the other example of embodiment of the acoustic generator of this invention, (b) is a schematic plan view of the other main surface side frame member shown to (a), (c) is It is an AA line schematic sectional drawing shown to (a). FIG. 3 is a schematic cross-sectional view of the piezoelectric element shown in FIGS. 1 and 2. (A) is a schematic plan view which shows the other example of embodiment of the acoustic generator of this invention, (b) is a schematic plan view of the other main surface side frame member shown to (a), (c) is It is an AA line schematic sectional drawing shown to (a). (A) is a schematic plan view which shows the other example of embodiment of the acoustic generator of this invention, (b) is a schematic plan view of the other main surface side frame member shown to (a), (c) is It is an AA line schematic sectional drawing shown to (a). (A) is a schematic plan view which shows the other example of embodiment of the acoustic generator of this invention, (b) is a schematic plan view of the other main surface side frame member shown to (a), (c) is It is an AA line schematic sectional drawing shown to (a). (A) is a schematic plan view which shows the other example of embodiment of the acoustic generator of this invention, (b) is a schematic plan view of the other main surface side frame member shown to (a), (c) is It is an AA line schematic sectional drawing shown to (a). It is a figure which shows the structure of embodiment of the sound generator of this invention. It is a figure which shows the structure of embodiment of the electronic device of this invention.

  Hereinafter, an example of an embodiment of a sound generator of the present invention will be described with reference to the drawings.

  Fig.1 (a) is a schematic plan view which shows an example of embodiment of the acoustic generator of this invention, FIG.1 (b) is an AA line schematic sectional drawing shown to Fig.1 (a). FIG. 2 (a) is a schematic plan view showing another example of the embodiment of the sound generator of the present invention, and FIG. 2 (b) shows the other main surface side frame member shown in FIG. 2 (a). FIG. 2C is a schematic plan view, and FIG. 2C is a schematic cross-sectional view taken along line AA shown in FIG. In addition, the schematic plan view of the other main surface side frame member refers to the other main surface side frame member in a state excluding the one main surface side frame member, the diaphragm, the resin layer, and the wiring member from the one main surface side (above). FIG.

The acoustic generator 1 of the example shown in FIGS. 1 and 2 includes a piezoelectric element 11 as an exciter, a vibration element 12 to which the piezoelectric element 11 is attached, and vibrates with the piezoelectric element 11 due to vibration of the piezoelectric element 11; The sound generator includes a frame body 13 that is joined to the outer peripheral portion of the diaphragm 12 and supports the diaphragm 12. The frame body 13 is formed by joining a plurality of frame members in the circumferential direction.

  As the exciter constituting the acoustic generator 1, for example, a plate-like piezoelectric element 11 is used. The piezoelectric element 11 is attached to the surface of the diaphragm 12, for example, and is excited by exciting the diaphragm 12 by applying a voltage. As a configuration when the piezoelectric element 11 is used as an exciter, for example, as shown in FIG. 3, piezoelectric layers 11a, 11b, 11c, and 11d made of four ceramic layers and three internal electrode layers 11e are formed. It is provided with laminated bodies alternately laminated, surface electrode layers 11f and 11g formed on the upper and lower surfaces of the laminated body, and external electrodes 11h and 11i formed on the side surfaces from which the internal electrode layer 11e is derived.

The piezoelectric layer constituting the piezoelectric element 11 is formed of ceramics having piezoelectric characteristics. As such ceramics, lead zirconate titanate
Conventionally used piezoelectric ceramics such as lead-free piezoelectric materials such as lithium niobate, lithium tantalate, Bi layered compounds, and tungsten bronze structure compounds can be used. The thickness of one layer of the piezoelectric layer is preferably set to 0.01 to 0.1 mm, for example, so as to be driven at a low voltage. In order to obtain a large bending vibration, it is preferable to have a piezoelectric constant d31 of 200 pm / V or more.

  The internal electrode layer 11e constituting the piezoelectric element 11 is formed by simultaneous firing with ceramics forming the piezoelectric layer, and includes a first internal electrode layer and a second internal electrode layer. The piezoelectric layers 11a, 11b, 11c, and 11d are alternately stacked to sandwich the piezoelectric layers 11a, 11b, 11c, and 11d from above and below, and the first internal electrode layer and the second internal electrode layer are arranged in the stacking order. As a result, a driving voltage is applied to the piezoelectric layers 11a, 11b, 11c, and 11d sandwiched between them. As a material for forming the internal electrode layer 11e, various metal materials can be used. For example, a conductor mainly composed of silver or a silver-palladium alloy having low reactivity with piezoelectric ceramics, or a conductor containing copper, platinum, or the like can be used. Good. When the internal electrode layer 11e is made of a material containing a metal component composed of silver and palladium and a ceramic component constituting the piezoelectric layers 11a, 11b, 11c, and 11d, the piezoelectric layers 11a, 11b, and 11c are formed. , 11d and the internal electrode layer 11e, the stress due to the difference in thermal expansion can be reduced, so that the piezoelectric element 11 having no stacking failure can be obtained.

  As the exciter, for example, the piezoelectric element 11 made of a plate-like body in which the main surfaces on the upper surface side and the lower surface side have a polygonal shape such as a rectangular shape or a square shape, or a circular shape or an elliptical shape is preferable. By using the piezoelectric element 11 and the diaphragm 12 and the frame 13 described later, the acoustic generator 1 can be made thin.

  Furthermore, it is preferable that the piezoelectric element 11 has a bimorph structure. That is, it is preferable that the direction of polarization with respect to the direction of the electric field applied at a certain moment is polarized so as to be reversed between one side and the other side in the thickness direction. In addition to contributing to the reduction in thickness, the diaphragm 12 can be vibrated efficiently with less energy, so that the sound generator 1 having a high sound volume can be obtained.

  The diaphragm 12 constituting the acoustic generator 1 can be formed using various materials such as resin and metal. For example, the diaphragm 12 can be made of a resin film such as polyethylene or polyimide having a thickness of 10 to 200 μm.

  A piezoelectric element 11 as an exciter is attached to the diaphragm 12. Specifically, the main surface of the piezoelectric element 11 is joined to the main surface of the diaphragm 12 with an adhesive such as an epoxy resin.

  The vibration plate 12 vibrates together with the exciter (piezoelectric element 11) by the vibration of the exciter (piezoelectric element 11). For example, when the piezoelectric element 11 is a bimorph structure piezoelectric element, the wiring member 15 is connected to the external electrode, and an electric signal is input to the piezoelectric element 11 via the wiring member 15 (a voltage is applied). At a certain moment, the piezoelectric layer on the side bonded to the diaphragm 12 (the lower surface side of the piezoelectric element 11) contracts and the piezoelectric layer on the upper surface side of the piezoelectric element 11 deforms so as to extend, and the diaphragm 12 Bend to the side. Therefore, by applying an AC signal to the piezoelectric element 11, the piezoelectric element 11 can bend and vibrate, and the diaphragm 12 can be bent. In addition, as the wiring member 15, a flexible substrate (FPC) in which a metal foil such as copper or aluminum is sandwiched between resin films, a metal plate, or the like is used. It is advantageous for thinning and low profile.

  And the frame 13 is provided so that the outer peripheral part of the diaphragm 12 may be supported. As the frame 13, for example, a frame member whose inner peripheral shape and outer peripheral shape are rectangular can be used. In the example shown in FIG. 1, the frame 13 is composed of a frame member 131 provided only on one main surface side of the diaphragm 12, and the sound generator 1 is configured by attaching the outer peripheral portion of the diaphragm 12 to the frame member 131. ing. On the other hand, in the example shown in FIG. 2, the frame 13 is composed of one main surface side frame member 131 provided on one main surface side and the other main surface side frame member 132 provided on the other main surface side. The diaphragm 3 is supported by sandwiching the outer periphery of 12. The outer peripheral part of the diaphragm is fixed by being sandwiched between the one main surface side frame member 131 and the other main surface side frame member 132 constituting the frame body 13. In this way, the diaphragm 12 is supported by the frame body 13 while being stretched within the frame of the frame body 13. 1, a portion located on the inner side of the frame 13 in the diaphragm 12, and the one main surface side frame member 131 and the other main surface side frame member 132 that are configured by the frame body 13 in the diaphragm 12 in FIG. 2. The portion not sandwiched between the two can vibrate freely.

  The thickness and material of the one main surface side frame member 131 and the other main surface side frame member 132 constituting the frame body 13 are not particularly limited. As thickness of the one main surface side frame member 131 and the other main surface side frame member 132 which comprise the frame 13, the thing of 100-5000 micrometers can be employ | adopted, for example. Moreover, as a material of the one main surface side frame member 131 and the other main surface side frame member 132 constituting the frame body 13, various materials such as glass, metal, and resin can be used. In the case of glass, since there is mechanical strength, deformation of the one main surface side frame member 131 and the other main surface side frame member 132 is small, and sound quality is stabilized. In the case of metal, the rigidity is smaller than that of glass, the difference between the resonance peak and the dip is further dispersed, and the frequency characteristics can be flattened. Therefore, the sound quality can be improved by flattening the sound pressure. In the case of resin, the rigidity is further smaller than that of metal, the difference between the resonance peak and the dip is dispersed, and the frequency characteristics can be flattened. Therefore, the sound quality can be improved by flattening the sound pressure.

  1 and 2 show an example in which the frame 13 has a rectangular shape and the shape of the inner region is a rectangular shape. However, since the aspect ratio is larger than 1, resonance dispersion is shown. And can contribute to the flattening of the peak / dip. However, it may be a polygon such as a square, a parallelogram, a trapezoid, and a regular n-gon, or a circle or an ellipse.

  The acoustic generator 1 further includes a resin layer 14 provided so as to cover the surfaces of the piezoelectric element 11 and the diaphragm 12 within the frame of the frame body 13 and vibrates together with the piezoelectric element 11 and the diaphragm 12. Good.

The resin layer 14 is preferably formed using, for example, an acrylic resin so that the Young's modulus is in the range of 1 MPa to 1 GPa, for example. The resin layer 14 is not necessarily provided until the surface of the piezoelectric element 11 is covered, but is provided until the surface of the piezoelectric element 11 is covered (the piezoelectric element 11 is embedded in the resin layer 14). Since a moderate damping effect can be induced, the resonance phenomenon can be suppressed and the peak or dip in the frequency characteristic of the sound pressure can be suppressed to a small value. In the drawing, the resin layer 14 is formed so as to have the same height as the frame 13, but the resin layer 14 may be formed so as to be higher than the height of the frame 132.

  In addition, although the figure illustrates the case where there is one exciter (piezoelectric element 11), the number of exciters (piezoelectric element 11) is not limited. Moreover, although the figure shows the case where the piezoelectric element 11 is provided on one main surface of the diaphragm 12, the piezoelectric element 11 may be provided on both surfaces of the diaphragm 12. Further, as the piezoelectric element 11, a bimorph type stacked piezoelectric element has been described as an example. However, a unimorph type piezoelectric element (a stacked piezoelectric element that expands and contracts) may be used.

  And the sound generator 1 of this embodiment WHEREIN: The frame 13 is divided | segmented into the some frame member in the circumferential direction, and is mutually joined.

  Specifically, the frame 13 (one main surface side frame member 131) shown in FIG. 1 has one main surface side first frame member 1311, one main surface side second frame member 1312, and one main surface side in the circumferential direction. The four frame members of the third frame member 1313 and the first main surface side fourth frame member 1314 are configured to be joined to each other at the joint B.

  Further, the frame 13 (the one main surface side frame member 131 and the other main surface side frame member 132) shown in FIG. 2 has one main surface side frame member 131 in the circumferential direction as in the form shown in FIG. Four frame members of the surface side first frame member 1311, the one main surface side second frame member 1312, the one main surface side third frame member 1313 and the one main surface side fourth frame member 1314 are joined to each other at the joint B. Has been configured. Further, the other main surface side frame member 132 includes the other main surface side first frame member 1321, the other main surface side second frame member 1322, the other main surface side third frame member 1333 and the other main surface side fourth frame in the circumferential direction. Four frame members of the frame member 1344 are joined to each other at the joint portion B.

  In the joint portion B, for example, two adjacent frame members are joined using an adhesive such as an epoxy thermosetting resin, a UV resin, an anaerobic UV resin, or an instantaneous adhesive.

In this way, by joining the frame body 13 (one main surface side frame member 131 and the other main surface side frame member 132) to each other in the circumferential direction, there are several joint portions B in the circumferential direction. Will do. When an integral frame is used, resonance is strongly developed and the peak / dip (the part where the sound pressure is higher / lower than the surrounding area) may increase, while there are multiple frames in the circumferential direction. When joining each other as a single structure, the sound quality is improved by dispersing the resonance and flattening the peak / dip as compared with an integral frame.

  Here, as shown in FIG. 1, in the case where the one main surface side frame member 131 that is the frame 13 is rectangular, a plurality of frame members (one main surface side first structure) constituting the one main surface side frame member 131 are used. One frame member 1311, one main surface side second frame member 1312, one main surface side third frame member 1313 and one main surface side fourth frame member 1314) are each a rectangular frame 13 (one main surface side frame member) 131) and a plurality of frame members (one main surface side first frame member 1311, one main surface side second frame member 1312, one main surface side third frame). Two adjacent frame members of the member 1313 and the first main surface side fourth frame member 1314) are preferably joined. In addition, the corner | angular part here means the area | region where the junction part B extends toward a direction perpendicular | vertical to an outer corner | angular part or an outer side at least from an inner corner | angular part.

In addition, as shown in FIG. 2, when the one main surface side frame member 131 and the other main surface side frame member 132 which are the frame bodies 13 are rectangular, a plurality of frames constituting the one main surface side frame member 131. Each of the members (one main surface side first frame member 1311, one main surface side second frame member 1312, one main surface side third frame member 1313, and one main surface side fourth frame member 1314) is a rectangular frame 13. Each side of the (one main surface side frame member 131) constitutes a plurality of frame members (one main surface side first frame member 1311, one main surface side second frame member 1312, Two adjacent frame members of the one main surface side third frame member 1313 and the one main surface side fourth frame member 1314) are joined together, and a plurality of frame members constituting the other main surface side frame member 132 (The other main surface side first frame member 1321, the other main surface side second frame portion 1322, the other main surface side third frame member 1323, and the other main surface side fourth frame member 1324) constitute the sides of the rectangular frame 13 (the other main surface side frame member 132), respectively. A plurality of frame members (the other main surface side first frame member 1321, the other main surface side second frame member 1322, the other main surface side third frame member 1323, and the other main surface side fourth frame member 1324). It is preferable that two adjacent frame members are joined.

  By providing the joint portion B of two adjacent frame members at the corners of the rectangular frame 13 (one main surface side frame member 131, the other main surface side frame member 132), the deformation of the frame 13 is reduced. Sound quality is stabilized while ensuring good sound quality.

  In addition, although it is preferable to comprise the frame 2 from four frame members, it is not restricted to this. As shown in FIG. 4, there are two frame members in the circumferential direction (one main surface side first frame member 1311, one main surface side second frame member 1312, the other main surface side first frame member 1321, and the other main surface side. The second frame member 1322) may be combined, or three may be used although not shown.

  Moreover, as shown in FIGS. 5-7, the frame is arranged along the outer peripheral portion of the one main surface of the diaphragm, the one main surface side frame member, and the outer peripheral portion of the other main surface of the diaphragm And the other main surface side frame member, as viewed from a direction perpendicular to the one main surface of the diaphragm, and the other main surface side frame member It is preferable that the bonding site is different.

  In the embodiment shown in FIG. 5, the one main surface side frame member 131 and the other main surface side frame member 132 are each composed of four members, and one end surface of each member is joined to the side surface of the adjacent member. In addition, the respective joining sites are different between the one main surface side frame member 131 and the other main surface side frame member 132. In the embodiment shown in FIG. 6, the one main surface side frame member 131 and the other main surface side frame member 132 are each composed of four members, and both end surfaces of a pair of members are joined to the side surfaces of adjacent members. In addition, the respective joining portions are different between the one main surface side frame member 131 and the other main surface side frame member 132. Further, in the embodiment shown in FIG. 7, the one main surface side frame member 131 is composed of four members each having both end surfaces cut obliquely, and the end surfaces of the respective members are joined to the end surfaces of the adjacent members. The other main surface side frame member 132 is composed of four members, and one end surface of each member is bonded to the side surface of the adjacent member, and each bonded portion is one main surface side frame member 131. And the other main surface side frame member 132 are different.

  In addition, as a junction site | part, you may exist in the center of not only the rectangular corner | angular part as shown in figure but the edge | side.

  Thus, by making the joining part of the one main surface side frame member 131 different from the joining part of the other main surface side frame member 132, the deformation of the frame 13 is reduced, and the sound quality is stabilized.

  Next, an example of an embodiment of the sound generator of the present invention will be described.

The sound generation device 20 is a sound generation device such as a so-called speaker, and includes, for example, a sound generator 1 and a housing 30 that houses the sound generator 1 as shown in FIG. The housing 30 resonates the sound generated by the sound generator 1 and radiates the sound to the outside through an opening (not shown) formed in the housing 30. The housing 30 can be formed using various materials such as metals such as aluminum and magnesium alloys, resins such as polycarbonate, and wood. By having such a housing 30, for example, the sound pressure in a low frequency band can be increased.

  Such a sound generator 20 can be used alone as a speaker, and can be suitably incorporated into a portable terminal, a thin television, a tablet terminal, or the like, as will be described later. Moreover, it can also be incorporated into home appliances that have not been prioritized in terms of sound quality, such as refrigerators, microwave ovens, vacuum cleaners, and washing machines.

  Next, an electronic device equipped with an acoustic generator will be described with reference to FIG. FIG. 9 is a diagram illustrating a configuration of the electronic device 50 according to the embodiment. In the figure, only components necessary for explanation are shown, and descriptions of general components are omitted.

  As shown in FIG. 9, the electronic device 50 of this example includes an acoustic generator 1, an electronic circuit 60 connected to the acoustic generator 1, and a housing 40 that houses the electronic circuit 60 and the acoustic generator 1. And having a function of generating sound from the sound generator 1. In the example illustrated in FIG. 9, the electronic device 50 is a mobile terminal device such as a mobile phone or a tablet terminal.

  As shown in FIG. 9, the electronic device 50 includes an electronic circuit 60. The electronic circuit 60 includes, for example, a controller 50a, a transmission / reception unit 50b, a key input unit 50c, and a microphone input unit 50d. The electronic circuit 60 is connected to the sound generator 1 and has a function of outputting an audio signal to the sound generator 1. The sound generator 1 generates sound based on the sound signal input from the electronic circuit 60.

  In addition, the electronic device 50 includes a display unit 50e, an antenna 50f, and the sound generator 1, and includes a housing 40 that accommodates these devices. Although FIG. 9 shows a state in which each device including the controller 50a is accommodated in one housing 40, the accommodation form of each device is not limited. In the present embodiment, it is sufficient that at least the electronic circuit 60 and the sound generator 1 are accommodated in one housing 40.

  The controller 50 a is a control unit of the electronic device 50. The transmission / reception unit 50b transmits / receives data via the antenna 50f based on the control of the controller 50a. The key input unit 50c is an input device of the electronic device 50 and accepts a key input operation by an operator. The microphone input unit 50d is also an input device of the electronic device 50, and accepts a voice input operation by an operator. The display unit 50e is a display output device of the electronic device 50, and outputs display information based on the control of the controller 50a.

  The sound generator 1 operates as a sound output device in the electronic device 50. The sound generator 1 is connected to the controller 50a of the electronic circuit 60, and emits sound upon application of a voltage controlled by the controller 50a.

  In FIG. 9, the electronic device 50 is described as a portable terminal device. However, the electronic device 50 is not limited to the type of the electronic device 50, and may be applied to various consumer devices having a function of emitting sound. . For example, flat-screen televisions and car audio devices can of course be used for products having a function of generating sound, for example, various products such as vacuum cleaners, washing machines, refrigerators, microwave ovens, and the like.

  According to the electronic device 50 of this example, since the sound generator 1 with improved sound quality is used, a high sound quality electronic device can be obtained.

  Next, a portable terminal equipped with an acoustic generator will be described.

  As shown in FIG. 9, the portable terminal of this example includes a sound generator 1, an electronic circuit 60 connected to the sound generator 1, a housing 40 that houses the electronic circuit 60 and the sound generator 1, and a display And has a function of generating sound from the sound generator 1.

  That is, in the above-described electronic device 50, the mobile terminal of this example has a configuration including a display which is a display device having a function of displaying image information as the display unit 50e shown in FIG. For example, known displays such as a liquid crystal display and an organic EL display can be suitably used. The display may have an input device such as a touch panel.

  Here, the joining member for joining the acoustic generator 1 to the housing 40 is a joining member including a viscoelastic body at least partially. The joining member may be a single member made of only a viscoelastic body or a composite body made up of several members including a viscoelastic body. As such a joining member, for example, a double-sided tape in which an adhesive is attached to both surfaces of a base material layer made of a nonwoven fabric or the like can be suitably used. The thickness of the joining member is set to 0.1 mm to 0.6 mm, for example.

  Examples of the electronic circuit 60 include a circuit that processes image information displayed on a display and audio information transmitted by a portable terminal, a communication circuit, and the like. At least one of these circuits may be included, or all the circuits may be included. Further, it may be a circuit having other functions. Furthermore, you may have a some electronic circuit. The electronic circuit and the sound generator are connected by connection wiring.

  A part of the housing 40 may be a display, or a part of the housing 40 may be a cover of the display and the display may be disposed on the inside thereof.

  Note that the mobile terminal has a communication means (communication unit) that transmits and receives data via an antenna or the like. For example, mobile phones such as smartphones, mobile devices such as tablet PCs and notebook PCs, game machines, and the like can be given.

  Since such a portable terminal is configured using the sound generator 1 with improved sound quality, a high-quality portable terminal can be realized.

DESCRIPTION OF SYMBOLS 1 Acoustic generator 11 Piezoelectric element 11a, 11b, 11c, 11d Piezoelectric layer 11e Internal electrode layer 11f, 11g Surface electrode layer 11h, 11i External electrode 12 Diaphragm 13 Frame body 131 One main surface side frame member 1311 One main surface side First frame member 1312 One main surface side second frame member 1313 One main surface side third frame member 1314 One main surface side fourth frame member 132 Other main surface side frame member 1321 Other main surface side first frame member 1322 Other main Surface side second frame member 1323 The other main surface side third frame member 1324 The other main surface side fourth frame member 14 Resin layer 15 Wiring member 20 Sound generator 30, 40 Housing 50 Electronic device 50a Controller 50b Transmission / reception unit 50c Key input Unit 50d microphone input unit 50e display unit 50f antenna 60 electronic circuit

Claims (9)

An exciter; a diaphragm that is attached to the exciter and vibrates with the exciter by vibration of the exciter; and a frame that is joined to an outer peripheral portion of the diaphragm and supports the diaphragm. A sound generator,
The frame body is constituted by a plurality of frame members joined to each other in the circumferential direction.   The sound generator according to claim 1, wherein the frame has a rectangular shape.   The plurality of frame members respectively constitute sides of the rectangular frame body, and two adjacent frame members are joined at corners of the rectangular shape. The sound generator according to 1. The frame includes a first main surface side frame member disposed along an outer peripheral portion of one main surface of the diaphragm, and an other main surface side frame disposed along the outer peripheral portion of the other main surface of the diaphragm. Including members,
2. The bonding portion of the one main surface side frame member and the bonding portion of the other main surface side frame member are different from each other when viewed from a direction perpendicular to the one main surface of the diaphragm. The sound generator according to any one of claims 3 to 4.   The sound generator according to claim 1, wherein the frame is made of glass.   The sound generator according to claim 1, wherein the frame is made of metal.   The sound generator according to any one of claims 1 to 4, wherein the frame is made of resin. The sound generator according to any one of claims 1 to 7,
A sound generator comprising: a housing for housing the sound generator. The sound generator according to any one of claims 1 to 7,
An electronic circuit connected to the acoustic generator;
A housing for housing the electronic circuit and the acoustic generator;
An electronic apparatus having a function of generating sound from the sound generator.

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