TWI542226B - Portable piezoelectric speaker and electronic device having the same - Google Patents

Description

Portable piezoelectric speaker and electronic device having the same

The present invention relates to a portable piezoelectric speaker and, more particularly, to a portable piezoelectric speaker that is removably coupled to an electronic device to amplify the volume of the electronic device.

Recently, small portable electronic devices that can be carried by users have increasingly emphasized size reduction, slimming, and weight reduction. In addition, it is widely used as a smart phone by adding versatile functions that can be suitably used in various multimedia environments or Internet environments, as well as simple communication functions. In particular, smart phones have wider screens, so that smart phones can be more appropriately used in multimedia environments, and for user convenience, touch-driven touch screens are commonly used in smart phones.

Meanwhile, in a portable electronic device capable of reproducing a multimedia source, due to size reduction, it does not provide its own speaker, and even if a speaker is provided therein, a mono speaker in which only the minimum sound can be reproduced is installed. In order to reduce power consumption. Therefore, in order to enable the user to understand the multimedia source at a sufficient volume, connect the individual A sounder is necessary.

However, since the conventional speaker has a large size, it is difficult for the user to carry the speaker. In addition, a separate connection line is required to connect the conventional speaker to the portable electronic device, and the user feels inconvenience because the user has to carry the speaker and the connection line separately. In the meantime, Korean Patent Publication No. 10-2012-0110664 discloses a portable terminal housing capable of providing vibration and sound.

The present invention provides a portable piezoelectric speaker that uses a piezoelectric speaker module that has a small size and is therefore easy to carry.

The present invention also provides a portable piezoelectric speaker that is removably coupled to the portable electronic device to amplify the volume of the portable electronic device.

The present invention also provides a portable piezoelectric speaker that is in contact with an object such as a table and is coupled to the portable electronic device, and thus can amplify the volume of the portable electronic device.

According to an exemplary embodiment, a portable piezoelectric speaker includes a body configured to be coupled and separated from a rear surface of an electronic device, and a piezoelectric speaker module coupled to a predetermined region of the body, wherein The piezoelectric speaker module includes a piezoelectric device, and a vibration transmitting member that is provided in contact with at least one region of the piezoelectric device and spaced apart from at least one surface of the piezoelectric device.

The body may have the same shape as the shape of the rear surface cover of the electronic device, and is coupled after separating the back cover of the electronic device.

An opening may be provided at a predetermined area of the body, and the piezoelectric module may be Insert and couple into the opening.

The piezoelectric speaker module may further include a connection terminal connected to the piezoelectric device on one side and exposed to the outside on the other side, and the other side of the connection terminal may be outputted at a rear surface provided on the electronic device Terminal connection.

The portable piezoelectric speaker may further include a flip cover provided at one side surface of the body so as to cover a front surface of the electronic device.

The portable piezoelectric speaker may further include a power supply portion provided at one side surface of the body to supply power to the piezoelectric speaker module.

The power supply portion may be provided at a second region extending from a first region of the body coupled to the electronic device in a length direction of the electronic device.

The power supply portion may include: a first connector connected to the external power terminal, a battery charged by power supplied via the first connector, a power amplifying portion configured to amplify power of the battery, and configured The power amplified by the power amplifying portion is supplied to the connection line of the piezoelectric speaker module.

The portable piezoelectric speaker may further include a circuit board provided between the first connector and the battery, and a power amplifying portion may be provided on the circuit board.

The portable piezoelectric speaker may further include a second connector that is provided on the circuit board in a direction opposite to the first connector for connection with the electronic device.

The portable piezoelectric speaker may further include a flip cover provided at one side surface to cover a front surface of the electronic device and a front surface of the power supply portion.

The portable piezoelectric speaker may further include a battery provided at a predetermined area of a rear surface of the electronic device to supply electric power to the piezoelectric speaker module and the electronic device.

The portable piezoelectric speaker may further include a side provided on the battery The power amplifying portion of the power supplied to the piezoelectric speaker module is enlarged.

According to another exemplary embodiment, a portable piezoelectric speaker includes a piezoelectric speaker module inserted into a predetermined area of a rear surface of an electronic device, and is provided to be coupled and separated from a rear surface of the electronic device. The body, wherein the piezoelectric speaker module includes a piezoelectric device, and a vibration transmitting member that is provided in contact with at least one region of the piezoelectric device and spaced apart from at least one surface of the piezoelectric device.

The insertion protrusion may be provided at a predetermined area of the piezoelectric speaker module, and the insertion groove may be provided at the body corresponding to the insertion protrusion, and the insertion protrusion may be inserted into the insertion groove.

According to still another exemplary embodiment, a portable piezoelectric speaker includes: a lower portion having a predetermined space therein and an upper vibration transmitting member; a piezoelectric device provided at a space in the vibration transmitting member; being provided on the piezoelectric device so as to be a first connector connected to the external power terminal; a battery charged by the power supplied via the first connector; and a power amplifying portion configured to amplify the power of the battery and supply the amplified power to the piezoelectric device, wherein The lower vibration transmitting member contacts at least a region of the piezoelectric device and is spaced apart from a surface of the piezoelectric device.

The portable piezoelectric speaker may further include a circuit board provided between the first connector and the battery, and a power amplifying portion may be provided on the circuit board.

The portable piezoelectric speaker may further include a second connector provided on the circuit board for connection with an electronic device.

The piezoelectric device may include: an unpolarized vibration generating layer; respectively provided at an upper side and a lower side of the vibration generating layer to perform polarization in a thickness direction and at least two or more piezoelectric layers stacked a layer; and a plurality of electrodes provided between the vibration generating layer and the piezoelectric layer, and each of the piezoelectric layers is stacked such that The directions of polarization may be opposite to each other.

The portable piezoelectric speaker may further include at least one via plug that passes through a predetermined region of each of the vibration generating layer and the piezoelectric layer, and may receive an electrode of the same polarity voltage via the via plug connection.

The electrode may be exposed to one side surface and the other side surface of the piezoelectric device, and may be connected by side surface electrodes provided at side surfaces of the piezoelectric device.

The vibration transmitting member may be provided such that the distance from the piezoelectric device toward the center portion is gradually increased, decreased, or evenly maintained from the piezoelectric device.

The other side of the piezoelectric speaker module can be in contact with the vibration amplifying object, and the sound pressure and the output are amplified.

According to still another exemplary embodiment, an electronic device includes a piezoelectric speaker module coupled to a rear surface thereof, wherein the piezoelectric speaker module includes a piezoelectric device and is in contact with at least one region of the piezoelectric device and A vibration transmitting member separated by at least one surface of the piezoelectric device.

The vibration transmitting member may be provided such that the distance from the piezoelectric device toward the center portion is gradually increased, decreased, or evenly maintained from the piezoelectric device.

The other side of the piezoelectric speaker module can be in contact with the vibration amplifying object, and the sound pressure and the output are amplified.

A portable piezoelectric speaker according to an exemplary embodiment is fabricated such that a body having the same shape as that of the rear surface of the portable electronic device is provided, and the piezoelectric speaker module is coupled to a predetermined area of the body. By coupling the body of the portable piezoelectric speaker to the rear surface of the portable electronic device, it is possible to use the piezoelectric speaker module to amplify the volume of the portable electronic device.

In addition, since the exemplary embodiment uses a piezoelectric speaker module, The portable piezoelectric speaker is made extremely thin and extremely small, and thus is easy to carry.

And since the body having the same shape as that of the rear surface cover of the portable electronic device is used as the vibration plate, it is possible to amplify the volume. When the portable piezoelectric speaker is in contact with an object such as a table and a case, it is possible to amplify the volume more.

10‧‧‧Power supply components/electronic devices

12‧‧‧ Groove

16‧‧‧Battery storage groove

100‧‧‧ Piezoelectric device

110‧‧‧First piezoelectric layer

111‧‧‧1a electrode

112, 122, 132, 152, 162, 172‧‧‧ internal electrodes

113‧‧‧1b electrode

120‧‧‧second piezoelectric layer

121‧‧‧2a electrode

123‧‧‧2b electrode

130‧‧‧ Third piezoelectric layer

131‧‧‧3a electrode

133‧‧‧3b electrode

140‧‧‧Vibration generating layer

143‧‧‧electrode

150‧‧‧fourth piezoelectric layer

151‧‧‧4a electrode

153‧‧‧4b electrode

160‧‧‧Film piezoelectric layer

161‧‧‧5a electrode

163‧‧‧5b electrode

170‧‧‧ sixth piezoelectric layer

171‧‧‧6a electrode

173‧‧‧6b electrode

180‧‧‧first through hole plug

182‧‧‧First cross-section electrode

184‧‧‧Second cross-section electrode

186a‧‧‧First upper surface electrode

186b‧‧‧Second upper surface electrode

190‧‧‧Second through hole plug

200‧‧‧Vibration board

210‧‧‧First vibration transmission board

220‧‧‧Second vibration transmission board

230‧‧‧ pattern

300‧‧‧Connecting terminal

400‧‧‧Vibration transmission housing

410‧‧‧Base

420‧‧‧coupled part

450‧‧‧ Tape

500‧‧‧Top cover

550, 1300‧‧‧ cushion material

1000‧‧‧ ontology

1000a‧‧‧First area

1000b‧‧‧Second area

1000c‧‧‧Central Wall

1100‧‧‧ first opening

1200‧‧‧ second opening

1310‧‧‧Storage space/first groove

1320‧‧‧second groove

1330‧‧‧ third groove

1400, 2650‧‧‧ upper cover

1500, 2500‧‧ ‧ prominence

2000‧‧‧Piezo speaker module

2600‧‧‧ Portable Piezoelectric Speakers

2610‧‧‧shims

2620, 4500 ‧ ‧ lower cover

2630, 4100, 5100‧‧‧ batteries

2640, 4200‧‧‧ circuit board

2642‧‧‧Connector

3000‧‧‧Flip

4000‧‧‧Power supply section

4210‧‧‧Connecting line

4300‧‧‧First connector

4400‧‧‧Second connector

5200‧‧‧Magnification

5300‧‧‧Bluetooth Module

A‧‧‧central part

A‧‧‧ portable piezoelectric speaker

B‧‧‧1/2 points

B‧‧‧Portable Piezoelectric Speakers

H‧‧‧First distance

L‧‧‧Second distance

R‧‧‧diameter

1 through 4 are schematic views of a piezoelectric speaker module in accordance with an exemplary embodiment.

5 to 7 are cross-sectional views of a piezoelectric device applied to a piezoelectric speaker, according to an exemplary embodiment.

FIG. 8 is a schematic cross-sectional view of a piezoelectric speaker module in accordance with an exemplary embodiment.

9 through 14 are schematic views of a portable piezoelectric speaker, in accordance with an exemplary embodiment.

15 through 17 are schematic views of a portable piezoelectric speaker in accordance with another exemplary embodiment.

18 to 22 are schematic views of a portable piezoelectric speaker according to still another exemplary embodiment.

23 is a characteristic diagram of a portable electronic device equipped with a portable piezoelectric speaker, and a state in which a portable electronic device equipped with a portable piezoelectric speaker is in contact with an object, according to an exemplary embodiment.

24 and 25 are exploded perspective views and coupled cross-sectional views of a piezoelectric speaker module in accordance with another exemplary embodiment.

Specific embodiments will be described in detail below with reference to the drawings. However, the invention may be embodied in different forms and the invention should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

FIG. 1 is a schematic diagram of a piezoelectric speaker module in accordance with an exemplary embodiment.

Referring to FIG. 1, a piezoelectric speaker module according to an exemplary embodiment includes a piezoelectric device 100, and a vibration transmission plate extending from at least two side surfaces of the piezoelectric device 100 so as to be spaced apart from a surface of the piezoelectric device 100. 200. In the piezoelectric speaker module, sound is amplified in a space between the piezoelectric device 100 and the vibration transmission plate 200 and then output.

The piezoelectric device 100 may have, for example, a quadrangular plate shape having a predetermined thickness. That is, the piezoelectric device 100 may have two surfaces (ie, an upper surface and a lower surface) opposed to each other, and four side surfaces defined along edges of the upper surface and the lower surface. Of course, the piezoelectric device 100 may have various shapes such as a circular shape, an elliptical shape, and a polygonal shape in addition to the quadrangular shape. The piezoelectric device 100 may include a substrate, and a piezoelectric layer provided on at least one surface of the substrate. For example, the piezoelectric device 100 may be of a bimorph type in which piezoelectric layers are provided on both surfaces of the substrate; or may be of a unimorph type in which a piezoelectric layer is provided on one surface of the substrate. At least one piezoelectric layer may be provided, and a plurality of piezoelectric layers may be stacked. Additionally, electrodes may be provided at each of the upper and lower sides of the piezoelectric layer. Here, for example, the piezoelectric layer may be made of a piezoelectric material based on PZT (Pb, Zr, Ti), NKN (Na, KmNb), or BNT (Bi, Na, Ti). In addition, the piezoelectric layers can be polarized in different directions from each other and stacked. That is, when multiple piezoelectric layers are provided The opposite polarization of each piezoelectric layer may be alternately provided on one surface of the substrate. Meanwhile, the substrate may be made of a material that generates vibration when the piezoelectric layer is maintained in a stacked structure, for example, a metal material and a plastic material. An electrode terminal to which a driving voltage is applied may be provided at at least one end of the substrate. However, the piezoelectric device 100 may not use a piezoelectric layer and a substrate that is a foreign substance. That is, the piezoelectric device 100 may include a piezoelectric layer that is not polarized and provided at a central portion thereof, and a plurality of piezoelectric layers that are polarized from each other in different directions and stacked at an upper portion thereof and a lower portion. Various exemplary embodiments of the piezoelectric device 100 including the non-polarized piezoelectric layer and the plurality of polarized piezoelectric layers will be described later with reference to FIGS. 5 through 7.

The vibration transmitting plate 200 may be provided to be spaced apart from at least one surface of the piezoelectric device 100 by a predetermined distance. For example, the edge of the vibration transmitting plate 200 may be adhered to the two opposite side surfaces of the piezoelectric device 100, and the remaining region of the vibration transmitting plate 200 may be spaced apart from a surface of the piezoelectric device 100. At this time, the vibration transmitting plate 200 may have, for example, a dome shape in which the distance from the piezoelectric device 100 gradually increases from the edge of the piezoelectric device 100 toward the central portion thereof. Of course, the vibration transmitting plate 200 may have a dome shape in which all four edges are adhered to the side surface of the piezoelectric device 100. For this purpose, for example, the vibration transmitting plate 200 may be provided larger than the piezoelectric device 100 according to the shape of the piezoelectric device 100. That is, the vibration transmission plate 200 may have a quadrangular shape in accordance with the shape of the piezoelectric device 100, and in consideration of the width of the region to which it is adhered to the side surface of the piezoelectric device 100 and the distance from a surface of the piezoelectric device 100 It can be provided larger than the piezoelectric device 100. The space between the piezoelectric device 100 and the vibration transmitting plate 200 may be a resonant cavity. The piezoelectric speaker module can be provided in contact with an electronic device such as a smart phone, and the side of the piezoelectric device 100 can be in contact with the body of the electronic device. In addition, the piezoelectric speaker module can be provided to be coupled to the electronic device and to the electronic device The device is separated. For example, a body having the same shape as the battery cover covering the rear surface of the electronic device may be provided, and the piezoelectric speaker module may be fastened to a predetermined area of the body, and then the body may be mounted at the rear surface of the electronic device . In addition, a groove is provided in a predetermined area of the rear surface of the electronic device, and the piezoelectric speaker module can be mounted in the groove. Of course, the piezoelectric speaker module can be connected to the electronic device via a cable. In the piezoelectric speaker module, the vibration transmission plate 200 can be used to transmit vibration and resonance of the piezoelectric device 100 to the outside. In addition, when the side surface of the vibration transmission plate 200 is in contact with a vibration amplifying object such as a table and a case, it is possible to amplify the output and the sound pressure more and then output it. Here, the vibration transmission plate 200 may be made of a metal material, a plastic material, or the like, and may have at least one double structure in which different kinds of materials are stacked, and may be made of a material having flexibility properties (for example, a resin such as PET). production. At the same time, the separation between the piezoelectric device 100 and the vibration transmitting plate 200 can be changed according to the size of the piezoelectric device 100, the housing space of the electronic device in which the piezoelectric speaker module is housed, the desired output, and the sound pressure or the like. distance.

2 through 4 are schematic views of a piezoelectric speaker module in accordance with other exemplary embodiments. As illustrated in FIG. 2 , the piezoelectric speaker module may include: a piezoelectric device 100; a first vibration transmitting plate 210 having two side surfaces extending from the piezoelectric device 100 so as to be in contact with the piezoelectric device 100 a dome shape in which the upper surface is spaced apart; and a second vibration transmission plate 220 having a dome shape extending from both side surfaces of the piezoelectric device 100 so as to be spaced apart from the lower surface of the piezoelectric device 100. That is, the piezoelectric speaker module according to another exemplary embodiment may include first and second vibration transmission plates 210 and 220 provided to be spaced apart from the upper surface and the lower surface of the piezoelectric device 100. Here, the first and second vibration transmitting plates 210 and 220 can be adhered to the pressure The same side surface of the electrical device 100, or may be attached to different side surfaces thereof. That is, the edges of the second vibration transmitting plate 220 may be adhered to both side surfaces of the piezoelectric device 100, which are orthogonal to the other side surface to which the first vibration transmitting plate 210 is adhered. Of course, the edges of the first and second vibration transmitting plates 210 and 220 may be provided to adhere to all side surfaces of the piezoelectric device 100.

In addition, as illustrated in FIG. 3 , the piezoelectric speaker module may include: a piezoelectric device 100; a vibration transmission plate 200 having extensions from at least two side surfaces of the piezoelectric device 100 to interact with the piezoelectric device 100 The upper surface is separated by a dome shape; and at least one pattern 230 is provided at a predetermined area of the vibration transmission plate 200. The pattern 230 may be defined by cutting or removing at least a portion of the vibration transmitting plate 200, or by attaching a material that is the same as or different from the material of the vibration transmitting plate 200 to the vibration transmitting plate 200. The pattern 230 may be defined to have a predetermined length from a region in contact with the piezoelectric device 100. In addition, the pattern 230 may be provided at at least one side of the vibration transmission plate 200.

As illustrated in FIG. 4, the piezoelectric speaker module may include a piezoelectric device 100, and a vibration transmission plate 200 extending from at least two side surfaces of the piezoelectric device 100 so as to be in contact with the piezoelectric device 100. At least one surface is separated by a uniform distance. That is, in each of the piezoelectric speaker modules according to the exemplary embodiments illustrated in FIGS. 1 to 3, the vibration transmitting plate 200 has a dome shape in which at least one of the piezoelectric devices 100 is The distance of the surface gradually increases from the edge of the piezoelectric device 100 toward the central portion thereof. However, in the piezoelectric speaker module of Fig. 4, the separation distance of the vibration transmission plate 200 is uniform over the entire area thereof. In addition, although not illustrated, the distance between the piezoelectric device 100 and the vibration transmitting plate 200 may be increased from both edges of the piezoelectric device 100 to a predetermined region thereof, and then may be other The area is uniform. As a result, in each of the piezoelectric speaker modules of the exemplary embodiment, the vibration transmitting plate 200 is defined to be spaced apart from at least one surface of the piezoelectric device 100 by a predetermined distance. Meanwhile, in the above description, the edge of the vibration transmission plate 200 is in contact with the side surface of the piezoelectric device 100. However, the edge of the vibration transmitting plate 200 may be in contact with the edge of one surface of the piezoelectric device 100.

Meanwhile, in each of the piezoelectric speaker modules according to the exemplary embodiments illustrated in FIGS. 1 to 3, the vibration transmitting plate 200 is defined such that the distance from the piezoelectric device 100 is from the piezoelectric device 100 The two edges gradually increase toward the center portion thereof, but the vibration transmitting plate 200 may be defined such that the distance gradually decreases from the two edges of the piezoelectric device 100 toward the central portion thereof. In addition, the distance between the piezoelectric device 100 and the vibration transmitting plate 200 at at least one region may be different from the distance at at least other regions. That is, the vibration transmitting plate 200 may be defined to have a predetermined curve and then adhere to the edge of the piezoelectric device 100.

FIG. 5 is a cross-sectional view of a piezoelectric device in accordance with an exemplary embodiment.

Referring to FIG. 5, a piezoelectric device 100 according to an exemplary embodiment may include: first to third piezoelectric layers 110, 120, and 130 polarized and stacked in a thickness direction; a vibration generating layer 140, which is provided in The lower surface of the tri-piezoelectric layer 130 is not polarized; and the fourth to sixth piezoelectric layers 150, 160, and 170 are provided at the lower side of the vibration generating layer 140 to be polarized in the thickness direction and Stacking. That is, in the piezoelectric device 100 according to an exemplary embodiment, the first to third piezoelectric layers 110, 120, and 130 are disposed on the vibration generating layer 140, and the fourth to sixth piezoelectric layers 150, 160 And 170 is disposed under the vibration generating layer 140.

Polarized in the thickness direction so that each of the first to third piezoelectric layers 110, 120, and 130 having piezoelectric properties may be a circular or quadrangular thin base board. The first to third piezoelectric layers 110, 120, and 130 are not limited to this case, and may be modified to have piezoelectric properties applicable to piezoelectric speakers. The first to third piezoelectric layers 110, 120, and 130 are stacked such that the polarization directions of the first to third piezoelectric layers 110, 120, and 130 are opposite to each other. For example, the first and third piezoelectric layers 110 and 130 may be polarized in a direction opposite to the vibration generating layer 140 (that is, in an upward direction of the vibration generating layer 140), and may be directed toward the vibration generating layer 140 ( That is, the second piezoelectric layer 120 is polarized in the downward direction of the vibration generating layer 140. The first piezoelectric layer 110 may have a first a-electrode 111 provided on an upper surface thereof, and a first b-electrode 113 provided on a lower surface thereof, and may be polarized from the first b-electrode 113 toward the first-a-electrode 111 A piezoelectric layer. The second piezoelectric layer 120 may have a second b electrode 123 provided on an upper surface thereof to be in contact with the first b electrode 113 of the first piezoelectric layer 110, and a second a electrode 121 provided on a lower surface thereof, and may be The second electrode 123 is polarized toward the second a-electrode 121. At this time, the 1b electrode 113 and the 2b electrode 123 can be integrally provided. The third piezoelectric layer 130 may have a third a-electrode 131 provided on an upper surface thereof to be in contact with the second a-electrode 121 of the second piezoelectric layer 120, and a third-b electrode 133 provided on a lower surface thereof, and may be self-contained The third electrode 133 is polarized toward the third a-electrode 131. At this time, the 2ath electrode 121 and the 3ath electrode 131 can be integrally provided.

The vibration generating layer 140 may be a ceramic plate that is not polarized in thickness, and thus does not have piezoelectric properties, and may be used to cause or amplify vibration at the third and fourth piezoelectric layers 130 and 150. produce. The vibration generating layer 140 may have a pair of electrodes 143 provided on the upper surface and the lower surface thereof to be electrically connected to the 3b electrode 133 and the 4bth electrode 153. At this time, the 3b electrode 133 and the electrode 143 provided on the upper surface of the vibration generating layer 140 may be integrally provided.

Each of the fourth to sixth piezoelectric layers 150, 160, and 170 that are polarized in the thickness direction so as to have piezoelectric properties may be a circular or quadrangular thin substrate. The fourth to sixth piezoelectric layers 150, 160, and 170 are not limited to this case, and may be modified to have piezoelectric properties applicable to piezoelectric speakers. The fourth to sixth piezoelectric layers 150, 160, and 170 are stacked such that the polarization directions of the fourth to sixth piezoelectric layers 150, 160, and 170 are opposite to each other. For example, the fourth and sixth piezoelectric layers 150 and 170 may be polarized in a direction opposite to the vibration generating layer 140 (ie, the downward direction of the vibration generating layer 140), and may be directed toward the vibration generating layer 140 ( That is, the upward direction of the vibration generating layer 140 is polarized by the fifth piezoelectric layer 160. The fourth piezoelectric layer 150 may have a 4bth electrode 153 provided on an upper surface thereof to be in contact with the electrode 143 of the vibration generating layer 140, and a 4ath electrode 151 provided on a lower surface thereof, and may be provided from the 4bth electrode 153 It is polarized toward the 4ath electrode 151. At this time, the 4bth electrode 153 provided to the electrode 143 on the lower surface of the vibration generating layer 140 and the fourth piezoelectric layer 150 may be integrally provided. The fifth piezoelectric layer 160 may have a 5th electrode 161 provided on an upper surface thereof to be in contact with the 4ath electrode 151 of the fourth piezoelectric layer 150, and a 5b electrode 163 provided on a lower surface thereof, and may be The fifth electrode 163 is polarized toward the fifth electrode 161. At this time, the 4ath electrode 151 and the 5ath electrode 161 can be integrally provided. The sixth piezoelectric layer 170 may have a 6b electrode 173 provided on an upper surface thereof to be in contact with the 5b electrode 163 of the fifth piezoelectric layer 160, and a 6a electrode 171 provided on a lower surface thereof, and may be The 6b electrode 173 is polarized toward the 6a electrode 171. At this time, the 5b electrode 163 and the 6b electrode 173 can be integrally provided.

Here, the first a, second a, third a, fourth a, fifth, and sixth a-electrode 111 of the first to sixth piezoelectric layers 110, 120, 130, 150, 160, and 170, 121, 131, 151, 161, and 171 are electrically connected to each other, and the first, second, third, fourth, fifth, and sixth bth electrodes 113, 123, 133, 153, 163, and 173 are also electrically connected to each other. Further, the first, second, third, fourth, fifth, and sixth a-electrodes 111, 121, 131, 151, 161, and 171 and the first, second, third, fourth, fifth, and sixth bth electrodes 113, 123, 133, 153, 163, and 173 are electrically insulated from each other. The first, second, third, fourth, fifth, and sixth a-electrodes 111, 121, 131, 151, and 161 of the first to sixth piezoelectric layers 110, 120, 130, 150, 160, and 170 are The electrodes 171 are electrically connected to each other to provide a first via plug 180 in which a conductive material is buried in the first pass through the first to sixth piezoelectric layers 110, 120, 130, 150, 160, and 170 and the vibration generating layer 140. In the hole. Further, in order to integrate the first, second, third, fourth, fourth, and fifth bth electrodes 113, 123, 133, and 153 of the first to sixth piezoelectric layers 110, 120, 130, 150, 160, and 170, 163 and 173 are electrically connected to each other to provide a second via plug 190 in which a conductive material is buried in the second via hole passing through the second to fifth piezoelectric layers 120, 130, 150, and 160 and the vibration generating layer 140. . Here, in order to prevent the a-th electrode from being short-circuited with the b-th electrode, the first, second, third, and fourth sides are not provided at each of the piezoelectric layers 110 to 170 in which the first via plug 180 is defined. , the 5th and 6bth electrodes 113, 123, 133, 153, 163 and 173, and not providing the 2a, 3a at each of the piezoelectric layers 110 to 170 in which the second via plug 190 is defined 4a and 5a electrodes 121, 131, 151 and 161.

In the piezoelectric device 100, for example, the (+) terminal of the power supply member 10 is connected to the 1ath electrode 111, and its (-) terminal is connected to the 6bth electrode 173, and thus power is supplied. That is, (+) electric power is applied to the first a, second, third, fourth, fifth, and sixth a-electrodes 111, 121, 131, 151, 161, and 171, and (-) Electric power is applied to the first, second, third, fourth, fifth, and sixth bth electrodes 113, 123, 133, 153, 163, and 173.

FIG. 6 is a cross-sectional view of a piezoelectric device in accordance with another exemplary embodiment.

Referring to FIG. 6, a piezoelectric device according to another exemplary embodiment may include first to fifth piezoelectric layers 110, 120, 130, 150, and 160 that are polarized and stacked in a thickness direction. The thickness of the third piezoelectric layer 130 is thicker than the thickness of each of the first, second, fourth, and fifth piezoelectric layers 110, 120, 150, and 160.

The configurations and shapes of the first to fifth piezoelectric layers 110, 120, 130, 150, and 160 correspond to the groups of the first to fifth piezoelectric layers 110, 120, 130, 150, and 160 in the exemplary embodiment. State and shape. However, in an exemplary embodiment, the thickness of the third piezoelectric layer 130 is provided to be thicker than each of the first, second, fourth, and fifth piezoelectric layers 110, 120, 150, and 160. . Since the thickness of the third piezoelectric layer 130 is provided to be thicker than the thickness of each of the first, second, fourth, and fifth piezoelectric layers 110, 120, 150, and 160, compared to other piezoelectrics The polarization state of each of the layers 110, 120, 150, and 160, the polarization state of the third piezoelectric layer 130 is maintained to be in an insufficient state, and thus due to a difference in the polarization state, resulting in polarization vibration.

FIG. 7 is a cross-sectional view of a piezoelectric device in accordance with still another exemplary embodiment.

Referring to FIG. 7, a piezoelectric device 100 according to still another exemplary embodiment may include: first to third piezoelectric layers 110, 120, and 130 polarized and stacked in a thickness direction; a vibration generating layer 140, which is provided in The lower surface of the third piezoelectric layer 130 is free from polarization; and the fourth to sixth piezoelectric layers 150, 160, and 170 are provided at the lower side of the vibration generating layer 140 to be polarized in the thickness direction. And stacking. In addition, the piezoelectric device 100 may include a plurality of internal electrodes 112, 122, 132, 152, 162, and 172, the electrodes are respectively in the piezoelectric layers 110 to 170 in the multilayer body in which the plurality of piezoelectric layers 110 to 170 are stacked. The internal electrodes 112, 122, 132, 152, 162, and 172 are alternately exposed to both side surfaces of the multilayer body. In addition, the first cross-sectional electrode 182 is provided at one side surface of the multilayer body, and is connected to the internal electrodes 112, 132, 152, and 172 exposed to one side surface of the multilayer body, and the second cross-sectional electrode 184 is provided in the multilayer The other side surface of the body is connected to the internal electrodes 122 and 162 exposed to the other side surface of the multilayer body. A first upper surface electrode 186a connected to the first cross-sectional electrode 182 and a second upper surface electrode 186b connected to the second cross-sectional electrode 182 are provided on the upper surface of the multilayer body to separate them from each other. A terminal is provided on each of the first and second upper surface electrodes 186a and 186b so as to be connected to the outside.

The piezoelectric device according to still another exemplary embodiment has the same structure as that of the piezoelectric device in the exemplary embodiment, but differs in that the internal electrode is exposed to the outside and connected to the cross-sectional electrode. That is, the piezoelectric device in the exemplary embodiment has the first and second through holes penetrating the plurality of piezoelectric layers, and the electrodes are connected to each other via the through holes. However, in the piezoelectric device according to still another exemplary embodiment having the same structure, the internal electrodes 112, 122, 132, 152, 162, and 172 are alternately exposed to both side surfaces of the multilayer body, and the first and second The cross-sectional electrodes 182 and 184 are connected to the internal electrodes 112, 122, 132, 152, 162, and 172 at one side surface of the multilayer body and at the other side surface. FIG. 8 is a schematic cross-sectional view of a piezoelectric speaker module for explaining a resonance frequency and a sound pressure characteristic according to a shape of the vibration transmission plate 200, according to an exemplary embodiment. As illustrated in FIG. 8, the vibration transmitting plate 200 may have, for example, a dome shape in which the distance from the piezoelectric device 100 gradually increases from the edge of the piezoelectric device 100 toward the central portion thereof. At this time, the diameter R of the piezoelectric device 100, the first distance H between the central portion a of the piezoelectric device 100 and the vibration transmitting plate 200, and the vibration transmitting plate 200 and (the central portion a of the piezoelectric device 100 are changed) While the second distance L between the edges is 1/2 point b, the resonance frequency and the sound pressure are measured and displayed in the following table. That is, Table 1, Table 2, and Table 3 show the resonance frequency and the sound pressure while changing the diameter R, the first distance H, and the second distance L.

As shown in Table 1, as the diameter R of the piezoelectric device 100 increases, the resonance frequency decreases and the sound pressure decreases. In addition, as shown in Table 2, as the first distance H between the central portion of the piezoelectric device 100 and the vibration transmitting plate 200 increases, the resonance frequency increases and the sound pressure decreases. And as shown in Table 3, as the second distance L between the vibration transmitting plate 200 and the 1/2 point b (between the central portion a of the piezoelectric device 100 and its edge) increases, the resonance frequency and the sound pressure are both Reduced. Therefore, the shape of the piezoelectric device 100 and the vibration transmitting plate 100 can be controlled to obtain a desired resonance frequency and sound pressure.

Meanwhile, in the piezoelectric speaker module according to the exemplary embodiment, the vibration transmission plate 200 is provided to be spaced apart from at least one surface of the piezoelectric device 100. However, since the vibration transmitting plate 200 is used to provide a resonance space between the vibration transmitting plate 200 and the piezoelectric device 100, the piezoelectric speaker module can be embodied by the vibration transmitting plate 200 and the piezoelectric device 100. Various materials or structures that provide a resonant space therebetween are adhered to the piezoelectric device 100. The piezoelectric speaker module can be provided with a body having the same shape as a rear surface cover covering the rear surface of the portable electronic device (such as a smart phone), and thus it can embody a portable piezoelectric speaker, and the body It may be removably coupled to the rear surface of the electronic device. In the following, various exemplary embodiments of a portable piezoelectric speaker using a piezoelectric speaker module will be described.

9 through 14 are schematic diagrams of a portable piezoelectric speaker illustrating a portable piezoelectric speaker integrally provided with a rear surface cover of an electronic device, in accordance with an exemplary embodiment. 9 is a front perspective view of a portable piezoelectric speaker according to an exemplary embodiment, and FIG. 10 is a schematic view illustrating a coupling manner between a body of the portable piezoelectric speaker and the piezoelectric speaker module. In addition, FIG. 11 is an exploded perspective view of the piezoelectric speaker module, and FIGS. 12 and 13 are schematic views of the portable piezoelectric speaker according to a modified embodiment of an exemplary embodiment. In addition, FIG. 14 is a graph comparing the properties of the portable piezoelectric speaker of FIG.

Referring to FIGS. 9-13 , a portable piezoelectric speaker according to an exemplary embodiment may include a body 1000 coupled to a rear surface of the electronic device 10 , and provided at an area of the body 1000 and connected to the electronic device 10 . Piezoelectric speaker module 2000. The body 1000 to which the piezoelectric speaker module 2000 is provided may be coupled after the back cover covering the rear surface of the electronic device 10 is separated. Of course, the body 1000 can be provided to cover the rear surface of the electronic device 10. In addition, as illustrated in FIG. 12, according to one The portable piezoelectric speaker of the exemplary embodiment may further include a flip cover 3000 provided at one side surface of the body 1000 so as to have a size capable of covering the entire surface of the electronic device 10, and thus covering the entire surface of the electronic device 10. .

First, the electronic device 10 suitable for the exemplary embodiment may include a portable terminal device such as a tablet PC and a smart phone, and in an exemplary embodiment, the smart phone is described as an example. The electronic device 10 may have a quadrangular shape having a predetermined thickness, and a display portion, a receiver portion, a button, and the like may be provided on a front surface thereof, and a circuit device and the like may be provided therein. The display section can visually display operational status, text information, and image information, and can also include a touch screen function that is operated by touch. In addition, the electronic device 10 may have a power button, a volume adjustment button, a headphone terminal, and a connector disposed at a side surface thereof. For example, a power button may be provided at the right side surface of the electronic device 10, and a volume adjustment button may be provided at a left side surface thereof opposite the right side surface thereof. And the earphone terminal may be provided at an upper side surface thereof, and the connector may be provided at a lower side surface thereof opposite to the upper side surface thereof. The electronic device 10 can include various functions as well as a voice call function, a video call function, and a multimedia function. For example, the electronic device 10 may include a wireless LAN function, a Bluetooth function, a GPS function, an NFC (Near Field Communication) function, and the like. Therefore, the circuit device can be provided in the electronic device 10 so that various functions can be realized. If the rear surface cover is removed, the battery can be mounted at a predetermined area of the rear surface of the electronic device 10, and the NFC terminal can be exposed, and a camera can be provided. In addition, an NFC antenna can be provided inside the back cover and connected to the NFC terminal.

The body 1000 can be provided for coupling and separation with the electronic device 10. That is, the body 1000 may be provided in the shape of a rear surface cover having the same shape as that covering the rear surface of the electronic device 10. Of course, the electronic device 10 can be manufactured such that the body 1000 It is a rear surface cover and is coupled to the rear surface of the electronic device 10 . In order to enable coupling and separation of the body 1000, for example, at least one coupling groove (not shown) may be provided at an edge of the rear surface of the electronic device 10, and may be at a region of the body 1000 corresponding to the coupling groove At least one coupling protrusion (not shown) is provided. Therefore, the coupling protrusion of the body 1000 is inserted into the coupling groove of the electronic device 10 , and thus the body 1000 can be coupled to the electronic device 10 . At the same time, the body 1000 can be made flexible, and thus can be deformed (eg, bent) within a desired range. For this purpose, the body 1000 may be made of polyimine PI or polycarbonate PC, or may be made of a metal material. Of course, the body 1000 can be made of the same material as the material of the surface cover behind the electronic device 10. Polyimine PI is a thermally conductive plastic material with excellent mechanical strength and excellent thermal and chemical stability. Polycarbonate PC is a thermoplastic material that has excellent heat resistance, impact resistance, optical properties, and processability. Meanwhile, the body 1000 may have a first opening 1100, and the piezoelectric speaker module 2000 may be inserted into the opening. Of course, the body 1000 may further have a second opening 1200 such that a camera (not shown) mounted at a rear surface of the electronic device 10 is exposed. That is, the first opening 1100 enables the piezoelectric speaker module 2000 to be inserted therein, and the second opening 1200 enables the camera to be exposed to the outside. At the same time, an NFC antenna can be provided at the body 1000. The NFC antenna can be provided on the piezoelectric speaker module 2000 and can be connected to the NFC terminal. That is, the piezoelectric speaker module 2000 can be provided at a predetermined area of the body 1000, and the NFC antenna can be provided on the piezoelectric speaker module 2000.

The piezoelectric speaker module 2000 can be inserted into the first opening 1100 of the body 1000 and fixed to a predetermined area of the body 1000. For example, the piezoelectric speaker module 2000 can be manufactured to be spaced apart from the vibration transmitting member illustrated in FIGS. 1 through 4 by a predetermined distance using the piezoelectric device 100 described in FIGS. 5 through 7. That is, the base The piezoelectric speaker module 2000 is fabricated in the structure described in FIGS. 1 through 4. More specifically, as illustrated in FIG. 11, the piezoelectric speaker module 2000 may include the piezoelectric device 100, the connection terminal 300 provided at a predetermined region on the piezoelectric device 100, as the lower side of the piezoelectric device 100 The bottom of the vibration transmitting member vibrates the transfer case 400, and the top cover 500 provided at the upper side of the piezoelectric device 100. In addition, the piezoelectric speaker module 2000 may further include a first tape (not shown) that adheres the piezoelectric device 100 to the bottom vibration transmitting case 400, and a second tape that adheres the piezoelectric device 100 to the top cover 500 (not Show). Here, the bottom vibration transmitting case 400 is provided so as to be spaced apart from the lower surface of the piezoelectric device 100 by a predetermined distance, and also serves as the vibration transmitting plate 200 described with reference to FIGS. 1 to 4. However, the bottom vibration transmitting housing 400 has a structure different from that of the vibration transmitting plate 200, and in order to distinguish it from the top cover 500 based on its positioning, the term "bottom vibration transmitting housing" is used.

The connection terminal 300 is provided at a predetermined area of the piezoelectric device 100 so as to be exposed to the outside. The connection terminal 300 is for supplying a power source and a sound source to the piezoelectric device 100. That is, the connection terminal 300 is connected to the output terminal of the electronic device 10, and supplies the power source and the sound source to the piezoelectric device 100. For example, the NFC terminal is exposed through the rear surface of the electronic device 10, and the connection terminal 300 is connected to the NFC terminal. Therefore, the power source and the sound source are received from the electronic device 10 via the NFC terminal and the connection terminal 300, and the piezoelectric speaker module 2000 is driven. For example, a flexible printed circuit board (FPCB) can be used to connect the terminals 300. Meanwhile, a portion of the connection terminal 300 exposed to the outside of the piezoelectric speaker module 2000 may be fixedly in close contact with a predetermined region of the body 1000, and the receiving groove may be provided in one of the regions of the body 1000, and the connection terminal 300 may be Adhered and fixed to the receiving groove.

The bottom vibration transmitting housing 400 houses the piezoelectric device 100 and is inserted and coupled To the first opening 1100 of the body 1000. The bottom vibration transmitting housing 400 includes a base 410, and a coupling portion 420 that protrudes upward from a surface of one of the bases 410. The pedestal 410 can be provided to be larger than the first opening 1100 of the body 1000 and expose the pedestal via the rear surface of the body 1000. Therefore, the base 410 can protrude from the rear surface of the body 1000. In addition, the pedestal 410 may have various shapes such as a quadrangular shape, a circular shape, and a polygonal shape. For example, as illustrated in Figure 11, the pedestal 410 can have an elliptical shape. The pedestal can be made of a material that is the same material as the body 1000. Additionally, the inner surface of the base 410 can be defined as planar or curved. That is, the inner surface of the susceptor 410 is spaced apart from the piezoelectric device 100 by a predetermined distance and may be defined as being curved such that the separation distance increases from the edge toward the central portion thereof. The coupling portion 420 protrudes on the base 410 to have a desired shape, and the piezoelectric device 100 is housed therein. For this purpose, the coupling portion 420 may have the shape of the piezoelectric device 100 and may protrude upward from the base 410. Therefore, the side surface of the piezoelectric device 100 can be fixedly in contact with the inner surface of the coupling portion 420. Additionally, the bottom vibration transmitting housing 400 can include a stepped portion defined within the interior of the coupling portion 420 that is higher than the base 420. For example, a stepped portion lower than the side surface may be provided inside the two opposing side surfaces, and the edge of the piezoelectric device 100 may be attached to the stepped portion via the first tape. In addition, since the piezoelectric device 100 is provided on the stepped portion, vibration is transmitted at a surface of the piezoelectric device 100 and a bottom portion of the surface of the piezoelectric device 100 (that is, the inner flat surface of the susceptor 410). A predetermined space is provided between the housings 400.

The top cover 500 serves to protect the piezoelectric device 100 from external physical forces and thus covers the upper surface of the piezoelectric device 100. That is, the top cover 500 may be attached to the edge of the upper surface of the piezoelectric device 100 via the second tape. The top cover 500 may be made of a thin plate having greater strength and hardness to avoid bending, for example, by stainless steel or the like. production. In addition, if the top cover 500 is in contact with the upper surface of the piezoelectric device 100, when the piezoelectric device 100 vibrates, the piezoelectric device 100 can collide with the top cover 500, and the vibration of the piezoelectric device 100 can be transmitted via the top cover 500. To the electronic device 10, and thus the vibration force of the piezoelectric device 100 can be reduced. In order to prevent the vibration force of the piezoelectric device 100 from being reduced, a gasket material (not shown) may be provided between the piezoelectric device 100 and the top cover 500. That is, the spacer material is provided at both edges of the piezoelectric device 100 such that the top cover 500 and the piezoelectric device 100 are maintained at a predetermined distance.

Additionally, as illustrated in FIG. 13, a gasket material 1300 can be provided at the inner surface of the body 1000 to cover the piezoelectric speaker module 2000. The volume space of the piezoelectric speaker module 2000 can be defined by the pad material 1300, and thus the phoneme variant of the electronic device 10 due to the vibration of the piezoelectric speaker module 2000 can be removed. Here, the gasket material 1300 may be made of, for example, a tantalum material, and may have various shapes such as a circular shape and a quadrangular shape to cover the piezoelectric speaker module 2000. Additionally, the cushioning material 1300 can be attached to the body 1000 or can be inserted into the receiving space 1310 defined in the body 1000. That is, the first and second partition walls having a predetermined distance therebetween to cover the piezoelectric speaker module 2000 may be provided, and the gasket material 1300 may be interposed between the first and second partition walls. At this time, the gasket material 1300 may be in contact with the back of the electronic device 10, and if the gasket material 1300 is too high, the body 1000 may not be coupled to the electronic device 10. Accordingly, the gasket material 1300 can have a predetermined height such that the body 100 is easily coupled. When the spacer material 1300 is provided, as illustrated in FIG. 14, the sound pressure is increased in the lower frequency band and the resonance frequency is also reduced as compared with the case where the spacer 1300 is not used. That is, FIG. 14 is a graph illustrating the resonant frequency and sound pressure of the portable piezoelectric speaker A of FIG. 13 using the spacer material, and the portable piezoelectric speaker B of FIG. 9 without using the spacer material. . As illustrated in the figure, in the case A using the spacer material, the sound pressure at a frequency of 0.1 kHz to 1 kHz is 63.0 dB, and in the case B where the spacer material is not used, the sound pressure is 56.6 dB. Further, in the case A using the spacer material, the sound pressure at a frequency of 1 kHz to 10 kHz was 93.4 dB, and in the case B where the spacer material was not used, the sound pressure was 91.0 dB. And in the case A using the spacer material, the sound pressure at a frequency of 0.3 kHz to 20 kHz is 88.7 dB, and in the case B where the spacer material is not used, the sound pressure is 84.0 dB. Further, in the case A in which the spacer material is used, the resonance frequency is 1.0 kHz, and in the case B in which the spacer material is not used, the resonance frequency is 1.4 kHz. And in the case A using the spacer material, the sound pressure at the resonance frequency was 95.4 dB, and in the case B where the spacer material was not used, the sound pressure at the resonance frequency was 94.0 dB.

A portable piezoelectric speaker according to an exemplary embodiment is fabricated such that the piezoelectric speaker module 2000 is inserted into the first opening 1100 defined in a predetermined region of the body 1000. However, an insertion groove (not shown) is provided in a predetermined region of the body 1000, and an insertion protrusion (not shown) is provided at a predetermined region of the piezoelectric speaker module 2000 such that the insertion protrusion is inserted into the insertion groove. For this purpose, two insertion protrusions are provided on the rear surface of the base 410, and then the insertion protrusions of the piezoelectric speaker module 2000 can be inserted into the insertion grooves of the body 1000. At this time, the susceptor 410 may have the same size as the piezoelectric device 100. In addition, the body 1000 may not have the first opening 1100, and the storage space may be provided at a predetermined area of the body 1000, and thus the piezoelectric speaker module 2000 may be inserted and received in the storage space. That is, a protruding region having the same shape as that of the susceptor 410 and also provided integrally with the body 1000 so as to protrude from the outside than other regions can be provided, and a housing space can be provided therein, and the piezoelectric speaker module 2000 can be provided. Insert into the storage space.

15 to 17 are portable piezoelectric Yangs according to another exemplary embodiment Schematic diagram of the sounder. That is, FIGS. 15 and 16 are schematic and exploded perspective views of a portable piezoelectric speaker according to another exemplary embodiment, and FIG. 17 is a schematic diagram of a portable piezoelectric speaker according to a modified embodiment.

15 and FIG. 16, a portable piezoelectric speaker according to another exemplary embodiment may include: a body 1000 coupled to a rear surface of the electronic device 10; and a piezoelectric speaker module 2000 provided in one of the bodies 1000. The area is connected to the electronic device 10; and a power supply portion 4000 is provided at an area of the body 1000 to supply power to the piezoelectric speaker module 2000. In addition, as illustrated in FIG. 17, the portable piezoelectric speaker according to another exemplary embodiment may further include a flip cover 3000 capable of covering the entire surface of the electronic device 10 from one side surface of the body 1000. Meanwhile, the piezoelectric speaker module 2000 has been described in an exemplary embodiment, and thus the description thereof will be omitted.

The body 1000 may include a first region 1000a corresponding to a rear surface of the electronic device 10, and a second region 1000b disposed at a lower side of the first region 1000a to provide the power supply portion 4000. That is, in the body 1000, the first region 1000a is provided to be the same size as the electronic device 10, and coupled to the rear surface of the electronic device 10, and may further be corresponding to the first side of the electronic device 10 A second area 1000b is provided at a lower side of the area 1000a. At this time, when the back cover is removed, the electronic device 10 may be coupled to the first region 1000a of the body 1000. That is, similarly in an exemplary embodiment, the back cover of the electronic device 10 is removed, and then the body 1000 is coupled to the rear surface of the electronic device 10. Additionally, a central wall 1000c may be provided between the first and second regions 1000a and 1000b that is higher than the bottom surface of the body 1000. For example, the middle wall 1000c can be provided at a height that is the same as the height of the lower side of the electronic device 10 where the connector is provided. That is, a plurality of coupling protrusions (not shown) may be provided At an edge of the first region 1000a of the body 1000, and inserted and coupled into a coupling groove (not shown) of the electronic device 10, and the middle wall 1000c can be provided at a height equal to the height of the lower surface of the electronic device 10. And thus in contact with the lower surface of the device. At this time, for example, the middle wall 1000c may have a first groove 1310 defined by removing a central portion thereof corresponding to the connector of the electronic device 10 to have the same side as the side of the connector. In addition, the middle wall 1000c may have a second groove 1320 defined by removing a predetermined area spaced apart from the center portion to one side so as to have a predetermined size. Meanwhile, the first region 1000a of the body 1000 may have a first opening 1100 having a predetermined size and inserted into the piezoelectric speaker module 2000. In addition, a predetermined area of the first region 1000a of the body 1000 (eg, inserted at a lower side of the first opening 1100 of the piezoelectric speaker module 2000) may be provided for mounting, for example, an NFX antenna, a DMB antenna, and a Bluetooth antenna. Space. The antenna mounting space may correspond to a space for a battery in which the electronic device 10 is mounted. At the same time, an upper cover 1400 attached to the first region 1000a of the body 1000 may be provided to cover the first region 1000a. That is, the piezoelectric speaker module 2000, the antenna or the like may be disposed in the first region 1000a of the body 1000 so as to be exposed to the outside, and the upper cover 1400 is used to cover the piezoelectric speaker module 2000, the antenna or the like. And thus it is prevented from being exposed to the outside. Meanwhile, the upper cover 1400 may be provided to be at least the same size as the first region 1000a, and the portion of the connection terminal 300 of the piezoelectric speaker module 2000 that is connected to the NFC terminal of the electronic device 10 may be removed.

The power supply portion 4000 may be provided at a region corresponding to the body 1000 on the lower side of the electronic device 10. That is, the power supply portion 4000 may be provided at the second region 1000b extending from the first region 1000a of the body 1000. Providing a power supply portion 4000 for supplying power to the piezoelectric speaker module 2000, and The portion can generate and supply power for driving the piezoelectric speaker module 2000. The power supply portion 4000 may be connected to an external power supply terminal or an external data supply terminal. In addition, the power supply portion 4000 may be connected to the electronic device 10. That is, the external power supply terminal or the external material supply terminal may be connected to one side of the power supply portion 4000, and the electronic device 10 may be connected to the other side of the power supply portion 4000. The power supply portion 4000 may include a battery 4100, a circuit board 4200, first and second connectors 4300 and 4400, and a lower cover 4500. The battery 4100 can be charged by power supplied via a power supply terminal connected to the first connector 4300. The first and second connectors 4300 and 4400 may be provided at an upper side of the circuit board 4200, and the battery 4100 may be connected to a lower side thereof. In addition, the first connector 4300 is connected to an external power supply terminal or a data supply terminal, and the second connector 4400 is connected to the electronic device 10. More specifically, first, the second region 1000b may have a third recess 1330 defined by partially removing its region corresponding to the first recess 1310 of the middle wall 1000c. The first connector 4300 is provided to correspond to the third groove 1330, and the second connector 4400 is provided to correspond to the first groove 1310. Here, the first connector 4300 is buried in the power supply portion 4000 so as not to be exposed to the outside, and the second connector 4400 is provided to be exposed to the first region 1000a. That is, if the battery 4100, the circuit board 4200, and the first and second connectors 4300 and 4400 are provided at the second region 1000b, and the lower cover 4500 is overlaid thereon, the recess of the first connector 4300 is buried therein. The lower side of the power supply portion 4000 is exposed, and the second connector 4400 protrudes to the upper side of the power supply portion 4000. In addition, the first connector 4300 may be provided to have a size for insertion into a power supply terminal or a material supply terminal, and the second connector 4400 may be provided to have a size inserted into a connector of the electronic device 10. That is, the power supply terminal or the data supply terminal is inserted into the first connector 4300 And the second connector 4400 is inserted into the connector of the electronic device 10 to be connected to the circuit board 4200 provided at the lower side of the first and second connectors 4300 and 4400. Additionally, a battery 4100 can be provided at the lower side of the circuit board 4200, and a connection line 4210 can be provided to extend from one side of the circuit board 4200. Accordingly, the circuit board 4200 can enable the battery 4100 to be charged by the power supplied via the first connector 4300, and can also enable the power of the battery to be supplied to the piezoelectric speaker module 2000 via the connection line 4210. Here, a power amplifying circuit may be provided on the circuit board 42000, and power supplied to the piezoelectric speaker module 2000 may be amplified using a power amplifying circuit. That is, the piezoelectric speaker module 2000 can be driven by electric power higher than the driving power of the electronic device 10, and the power supply portion 4000 can generate and supply the driving power of the piezoelectric speaker module 2000. In addition, the connecting line 4210 provided at one side of the circuit board 4200 is connected to the piezoelectric speaker module 2000 provided at the area 1000a via the second recess 1320 of the middle wall 1000c. Meanwhile, since the second connector 4400 is connected to the electronic device 10, it is possible to supply power or data to the electronic device 10 via the first and second connectors 4300 and 4400. Therefore, it is possible to amplify the volume using a portable piezoelectric speaker and also charge the battery 4100. At this time, when charging the electronic device 10, the battery 4100 of the power supply portion 4000 may be charged together, and the piezoelectric speaker module 2000 may be driven by the battery 4100.

A portable piezoelectric speaker according to an exemplary embodiment may be provided to be coupled and separated from the electronic device 10, and the body 1000 having the same shape as the rear surface of the electronic device 10 may be used as a vibration transmission medium to be amplified from the electronic device. 10 supplied volume. In addition, if the electronic device 10 to which the portable piezoelectric speaker is coupled is in contact with an object (such as a table and a case) through which vibration can be transmitted, it is possible to amplify the volume more. At this time, when a box or the like having a resonance space therein is used, It is possible to amplify the volume to a greater extent. In addition, in the portable piezoelectric speaker according to the exemplary embodiment, since the piezoelectric speaker module 2000 protrudes beyond the body 1000, it is possible to easily transmit the vibration to an article such as a case. The illustrative embodiments are applicable to all smart phones, tablets, or similar devices that require higher volume and enhanced sound quality.

Meanwhile, at least a portion of the portable piezoelectric speaker according to the exemplary embodiment is manufactured to be the same as the rear surface cover of the electronic device 10 and coupled to the rear surface of the electronic device 10. However, the portable piezoelectric speaker according to the exemplary embodiment may be manufactured to have various shapes and then coupled to the electronic device. That is, as illustrated in FIG. 18, the groove 12 is formed at a predetermined area of the rear surface of the electronic device 10, and the piezoelectric speaker module 2000 can be inserted into the groove 12. At this time, the piezoelectric speaker module 2000 may have a protrusion 2500 that protrudes in a direction opposite to the electronic device 10 and then insertable into a recess 1500 defined in a predetermined region of the body 1000.

In addition, as illustrated in FIG. 19, the portable piezoelectric speaker 2600 can be provided to be spaced apart from the electronic device 10, and the sound source can be wirelessly received. Of course, it can be connected to the earphone terminal of the electronic device 10 using a connecting wire. As illustrated in FIG. 20, the portable piezoelectric speaker 2600 can include a spacer 2610, a lower cover 2620, a piezoelectric device 100, a battery 2630, a circuit board 2640, and an upper cover 2650. The lower cover 2620 may have a substantially quadrangular shape in which a predetermined space is defined, and may include a bottom surface, and a side surface that extends upward from an edge of the bottom surface. At least one of the side surfaces may have at least one groove defined in a predetermined area thereof. A gasket 2610 is provided at the lower side of the lower cover 2620. The spacer 2610 can be made of a tantalum material and can be provided to have a quadrangular ring shape along the edge of the lower cover 2620. Shim 2610 is used to make It is necessary to maintain a predetermined distance between the upper surface of the object on which the portable piezoelectric speaker is placed and the portable piezoelectric speaker. The piezoelectric device 100, the battery 2630, and the circuit board 2640 are provided in the inner space of the lower cover 2620. Here, the piezoelectric device 100 is provided to be spaced apart from the lower cover 2620 by a predetermined distance. For example, a stepped portion may be provided between the bottom surface of the lower cover 2620 and its side surface so as to have a height smaller than the side surface, and the edge of the piezoelectric device 10 may be adhered and fixed to the stepped via a tape or the like. section. The battery 2630 is connected to the circuit board 2640 and is charged by power supplied from the outside. At least one connector 2642 is provided at an upper side of the circuit board 2640. A power terminal inserted through a recess of the lower cover may be inserted into at least one of the connectors 2642. In addition, the other of the connectors 2642 may be connected to the earphone terminal of the electronic device 10 using a connection line or the like. A power amplifying circuit can be provided at the circuit board 2640 to amplify the power supplied to the piezoelectric device 100 via the power amplifying circuit. That is, it is possible to amplify the power charged in the battery 2630 via the power amplifying circuit of the circuit board 2640, and then supply the amplified power to the piezoelectric device 100. The upper cover 2650 may be provided in a shape identical to that of the lower cover 2620, and its side surface may be hermetically contacted with the side surface of the lower cover so that the internal components therein can be hermetically maintained.

Meanwhile, in the portable piezoelectric speaker according to the exemplary embodiment, the piezoelectric speaker module 2000 provided at the body 1000 may receive power via a battery coupled to a rear surface of the electronic device 10. In addition, an amplifying portion for amplifying power may be provided in the battery to supply the amplified power to the piezoelectric speaker module 2000. That is, as illustrated in FIG. 21, in the portable piezoelectric speaker, the body 1000 provided with the piezoelectric speaker module 2000 can be coupled to the rear surface of the electronic device 10 and supplied for driving the electronic device 10. Power and for driving piezoelectric speaker modules The battery 5100 of electric power of 2000 can be coupled to the electronic device 10. That is, when the portable piezoelectric speaker is driven, the battery 5100 can be coupled to the electronic device 10, and can drive the electronic device 10 and the piezoelectric speaker module 2000, and can be inserted into and coupled to the rear surface of the electronic device 10. The defined battery receiving recess 16 is included. At this time, the electronic device 10 and the piezoelectric speaker module 2000 can be driven by different power sources. For example, the piezoelectric speaker module 2000 can be driven by driving power higher than the driving power of the electronic device 10. Therefore, it is necessary to amplify the power supplied to the piezoelectric speaker module 2000. For this purpose, the enlarged portion 5200 can be provided at one side of the battery 5100 as illustrated in FIG. 22A. The amplifying portion 5200 may have a connection terminal and thus may be connected to the connection terminal 300 of the piezoelectric speaker module 2000. Therefore, the piezoelectric speaker module 2000 can be driven by receiving power amplified by the amplifying portion 5200. Additionally, as illustrated in Figure 22b, an amplifying portion and a Bluetooth module 5300 can be provided at the other side of the battery 5100.

In the portable piezoelectric speaker according to the exemplary embodiment, when the piezoelectric speaker module 2000 is mounted at the electronic device 10, and the electronic device 10 is in contact with an object such as a table and a case, there is a possibility of increasing Resonant frequency and sound pressure. That is, FIG. 22 is a graph comparing the characteristics of the condition A in which the electronic device 10 having the piezoelectric speaker module is not in contact with the object and the condition B in which the electronic device 10 is in contact with the object. At this time, a box made of paper and having a hexahedral shape of 180 mm × 180 mm × 50 mm was used as the article. In addition, the electronic device 10 in contact with the case has a weight of 150 g, and the measurement operation is performed at a distance of 100 mm by measuring the voltage of 5 Vrms. In the case A which is not in contact with the object, the resonance frequency is 1.2 kHz, and in the condition B in contact with the object, the resonance frequency is 0.5 kHz, and thus it is understood that the resonance frequency is generated in the lower frequency.

Meanwhile, in the exemplary embodiment, the piezoelectric speaker module is described as being spaced apart from the piezoelectric device 100, and the condition of the bottom vibration transmitting case 400 is provided. However, the vibration transmission plate 200 may be provided in the bottom vibration transmission housing 400. That is, as illustrated in FIGS. 24 and 25, a piezoelectric speaker may be provided between the bottom vibration transmitting housing 400 and the top cover 500, which is provided at at least one side of the piezoelectric device 100 for interfacing with the piezoelectric device. The 100-part vibration transmission plate 200, and thus the piezoelectric speaker module. Here, the piezoelectric device 100 may be adhered to the bottom vibration transmitting housing 400 using the tape 450. In addition, if the top cover 500 is in contact with the upper surface of the piezoelectric device 100, the piezoelectric device 100 collides with the top cover 500 during vibration, and the vibration of the piezoelectric device 100 is transmitted to the electronic device 10 via the top cover 500, and Therefore, the vibration force of the piezoelectric device 100 can be reduced. In order to prevent the vibration force of the piezoelectric device 100 from being lowered, a gasket material 550 may be provided between the top cover 500 and the piezoelectric device 100. That is, the spacer material 550 is provided at both edges of the piezoelectric device 100 such that a desired distance is maintained between the top cover 500 and the piezoelectric device 100.

Although the portable piezoelectric speaker and the electronic device using the portable piezoelectric speaker have been described with reference to the specific embodiments, the device is not limited to the embodiments. It will be apparent to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as defined by the appended claims.

100‧‧‧ Piezoelectric device

200‧‧‧Vibration board

A‧‧‧central part

B‧‧‧1/2 points

H‧‧‧First distance

L‧‧‧Second distance

R‧‧‧diameter

Claims (25)

A portable piezoelectric speaker includes: a body configured to couple and separate from a rear surface of an electronic device; and a piezoelectric speaker module coupled to a predetermined area of the body, wherein the The piezoelectric speaker module includes a piezoelectric device, and a vibration transmitting member that is provided in contact with at least one region of the piezoelectric device and spaced apart from at least one surface of the piezoelectric device, wherein the vibration transmitting member is provided Such that the distance from the piezoelectric device is gradually increased, decreased, or evenly maintained from the edge toward the center portion. The portable piezoelectric speaker according to claim 1, wherein the body has a shape identical to a shape of a surface cover of the electronic device, and the rear surface cover of the electronic device is separated Then coupled. A portable piezoelectric speaker according to claim 2, wherein an opening is provided at a predetermined area of the body, and the piezoelectric speaker module is inserted and coupled into the opening. The portable piezoelectric speaker according to claim 2, wherein the predetermined area of the body protrudes to the outside, and a storage space is provided therein, and the piezoelectric speaker module is inserted and coupled to the In the storage space. The portable piezoelectric speaker according to claim 2, wherein the piezoelectric speaker module further includes a connection terminal that is connected to the piezoelectric device on one side and exposed to the outside on the other side, and The other side of the connection terminal is connected to an output terminal provided at the rear surface of the electronic device. The portable piezoelectric speaker of claim 5, further comprising an NFC antenna provided on the piezoelectric speaker module. The portable piezoelectric speaker according to claim 6, wherein the NFC terminal is further provided at the rear surface of the electronic device, and the NFC antenna is connected to the NFC terminal. The portable piezoelectric speaker of claim 5, further comprising a flip cover provided at one side surface of the body to cover a front surface of the electronic device. The portable piezoelectric speaker of claim 5, further comprising a gasket material provided inside the body to enclose the piezoelectric speaker module. The portable piezoelectric speaker according to claim 2, further comprising a power supply portion provided at one side surface of the body to supply electric power to the piezoelectric speaker module. The portable piezoelectric speaker according to claim 10, wherein the power supply portion is provided in a first region of the body coupled to the electronic device in a length direction of the electronic device Extending the second area. The portable piezoelectric speaker according to claim 11, wherein the power supply portion includes a first connector connected to an external power terminal, and a battery supplied through the first connector A power charging, power amplifying portion configured to amplify power of the battery, and a connection line configured to supply power amplified via the power amplifying portion to the piezoelectric speaker module. The portable piezoelectric speaker of claim 12, further comprising a circuit board provided between the first connector and the battery, Wherein the power amplifying portion is provided on the circuit board. The portable piezoelectric speaker of claim 13, further comprising a second connector provided on the circuit board in a direction opposite to the first connector for connection with the electronic device . The portable piezoelectric speaker according to claim 12, further comprising a flip cover provided at one side surface to cover a front surface of the electronic device and a front surface of the power supply portion. The portable piezoelectric speaker of claim 2, further comprising a predetermined area provided on the rear surface of the electronic device to supply electric power to the piezoelectric speaker module and the electronic The battery of the device. The portable piezoelectric speaker of claim 16, further comprising a power amplifying portion provided at one side of the battery to amplify power supplied to the piezoelectric speaker module. A portable piezoelectric speaker comprising: a piezoelectric speaker module inserted into a predetermined area of a rear surface of an electronic device; and a body provided to be coupled and separated from a rear surface of the electronic device, wherein The piezoelectric speaker module includes a piezoelectric device, and a vibration transmitting member provided in contact with at least one region of the piezoelectric device and spaced apart from at least one surface of the piezoelectric device, wherein the vibration transmission is provided The component is such that the distance from the piezoelectric device is gradually increased, decreased or evenly maintained from its edge toward the central portion. The portable piezoelectric speaker according to claim 18, wherein the insertion protrusion is provided at a predetermined area of the piezoelectric speaker module, and is inserted into the groove Provided at the body corresponding to the insertion protrusion, and the insertion protrusion is inserted into the insertion groove. A portable piezoelectric speaker comprising: a lower portion and an upper vibration transmitting member having a predetermined space therein; a piezoelectric device provided at the space in the vibration transmitting member; the first connector Provided on the piezoelectric device for connection to an external power terminal; a battery that is charged by power supplied via the first connector; and a power amplification portion configured to amplify power of the battery And supplying the amplified power to the piezoelectric device, wherein the lower vibration transmitting member is in contact with at least one region of the piezoelectric device and spaced apart from a surface of the piezoelectric device, wherein The lower vibration transmitting member is such that the distance from the piezoelectric device is gradually increased, decreased, or evenly maintained from the edge toward the center portion. The portable piezoelectric speaker of claim 20, further comprising a circuit board provided between the first connector and the battery, wherein the power amplifying portion is provided on the circuit board . The portable piezoelectric speaker of claim 21, further comprising a second connector provided on the circuit board for connection with the electronic device. The portable piezoelectric speaker according to any one of claims 1 to 19, wherein the other side of the piezoelectric speaker module is in contact with the vibration amplifying object, and the sound pressure and the output are amplified. An electronic device including a piezoelectric speaker module coupled to a rear surface thereof a group, wherein the piezoelectric speaker module includes a piezoelectric device, and a vibration transmitting member that is in contact with at least one region of the piezoelectric device and spaced apart from at least one surface of the piezoelectric device, wherein the vibration is provided The transfer member is such that the distance from the piezoelectric device is gradually increased, decreased, or evenly maintained from the edge toward the center portion. The electronic device of claim 24, wherein the other side of the piezoelectric speaker module is in contact with the vibration amplifying object, and the sound pressure and the output are amplified.