WO2016085230A1

WO2016085230A1 - Piezoelectric vibration device

Info

Publication number: WO2016085230A1
Application number: PCT/KR2015/012642
Authority: WO
Inventors: 박인길; 노태형; 박성철; 김영술; 윤경섭; 신희섭; 정인섭; 김수찬
Original assignee: 주식회사 이노칩테크놀로지
Priority date: 2014-11-25
Filing date: 2015-11-24
Publication date: 2016-06-02
Also published as: KR101544124B1

Abstract

The present invention discloses a piezoelectric vibration device comprising: a piezoelectric vibration member vibrating according to a predetermined voltage; and a weight member having at least one part thereof coming into contact with the piezoelectric vibration member, thereby amplifying the vibration of the piezoelectric vibration member, wherein the piezoelectric vibration member has a plurality of extension parts provided in a horizontal direction from the center thereof, and the weight member is provided so as to penetrate at least one part of the piezoelectric vibration member.

Description

Piezoelectric vibration device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to vibration devices, and more particularly to piezoelectric vibration devices used as haptic feedback means in electronic devices.

Piezoelectric material (Piezoelectric material) generates a voltage when the pressure is applied (piezoelectric effect), the increase or decrease of the volume or length due to the pressure change in the piezoelectric material when the voltage is applied (reverse piezoelectric effect). Piezoelectric vibration devices using the reverse piezoelectric effect is widely employed in various electronic devices such as mobile phones, portable multimedia players (PMPs), game machines, and the like.

The piezoelectric vibrating apparatus used for a mobile phone etc. can be used as a haptic feedback means which responds as a vibration to a user's touch. Tactile feedback refers to tactile sensations that can be felt by the user's fingertip (fingertip or stylus pen) when touching an object. The tactile feedback means is a vibration that is transmitted by a finger when a button is pressed with dynamic characteristics (such as a button display on a window screen) when a person touches a real object (actual button). It can be said that it is ideal to be able to reproduce touch, motion sound, etc.). Therefore, the piezoelectric vibrating apparatus needs to provide sufficient vibration force for the person to perceive the vibration through the tactile sense.

As an example of such a piezoelectric vibrating apparatus, a piezoelectric vibrating apparatus having a plurality of piezoelectric element layers attached to one or both surfaces of a diaphragm is disclosed in Korean Patent Registration No. 10-0502782 (hereinafter referred to as Patent Document 1). However, only a structure in which a piezoelectric element is attached to a diaphragm as in Patent Literature 1 is difficult to generate sufficient vibration force required by an electronic device. That is, not only the amplitude of vibration is too small, but also practically small compared to the vibration force generated by the coin type vibration motor or solenoid type vibration device using the electromagnet principle currently used in mobile phones.

In order to increase the vibration force, Korean Laid-Open Patent Publication No. 2011-0045486 (hereinafter referred to as Prior Patent 2) has a bar shape and a piezoelectric vibrating member which generates vibration, and is coupled to the piezoelectric vibrating member in a vertical direction by using a coupling member. A piezoelectric vibrating apparatus including a weight for amplifying power and a vibration supporting member for fixing a side surface of the piezoelectric vibrating member is proposed. That is, in the piezoelectric vibrating apparatus of the prior patent 2, the weight is coupled to the center portion of the bar-shaped piezoelectric vibrating member.

However, the piezoelectric vibrating apparatus of the prior patent 2 has a limitation in increasing the vibration force because the vibration force of the piezoelectric vibrating member is limited even if the vibration force of the piezoelectric vibrating member is increased by using a weight.

(Prior art document)

Korea Patent Registration No. 10-0502782

Korean Patent Publication No. 2011-0045486

The present invention provides a piezoelectric vibrating apparatus that can increase the vibration force of the piezoelectric vibrating member.

The present invention provides a piezoelectric vibration device capable of increasing the vibration force by deforming the shape of the piezoelectric vibration member.

The present invention provides a piezoelectric vibrating apparatus capable of increasing vibration force by providing a plurality of piezoelectric vibrating members having a bar shape.

A piezoelectric vibrating apparatus according to an aspect of the present invention includes a piezoelectric vibrating member vibrating according to a predetermined voltage; And a weight member in contact with at least a portion of the piezoelectric vibrating member to amplify the vibration of the piezoelectric vibrating member, wherein the piezoelectric vibrating member is provided with a plurality of extensions in a horizontal direction from a center thereof, and the weight member includes the piezoelectric vibration. It is coupled through at least a portion of the piezoelectric vibrating member on one side and the other side of the member.

The piezoelectric vibrating member may include a diaphragm including a first center portion and a plurality of first extension portions extending outwardly from the first center portion; And a piezoelectric plate including a second center portion in contact with the first center portion and a plurality of second extensions extending outwardly from the second center portion and in contact with the plurality of first extensions, respectively.

The first and second extensions have a predetermined width and length, and the length of the first extension is longer than the length of the second extension.

And a first opening formed in a predetermined region of the first central portion, and a second opening formed in the second central portion of a region corresponding to the first opening.

The weight member includes first and second weight members provided on one side and the other side of the piezoelectric vibrating member, respectively, and corresponds to the first and second openings on one surface of the first and second weight members facing each other. First and second protrusions are formed in the region.

The first protrusion has a step in the protrusion direction, including a first protrusion area having a first width in the protrusion direction and a second protrusion area narrower than the first width, and the second protrusion has a second protrusion area. Space is provided to surround.

The first protruding region is in contact with one surface of the piezoelectric vibrating member, and the second protruding region is coupled to the inside of the second protrusion through the first and second openings.

A plurality of first holes formed in the diaphragm and a plurality of second holes formed in a region corresponding to the plurality of first holes of the piezoelectric plate.

The weight member includes a first weight member provided at one side of the piezoelectric vibrating member and having a plurality of first protrusions, and a second weight member provided at the other side of the piezoelectric vibrating member and having a plurality of third holes.

The plurality of first protrusions are inserted into the plurality of third holes through the plurality of first and second holes of the piezoelectric vibrating member.

A second protrusion formed on the first weight member spaced apart from the plurality of first protrusions and in contact with one surface of the piezoelectric vibrating member, and formed on the second weight member spaced apart from the plurality of third holes. And a third protrusion contacting the other surface of the piezoelectric vibrating member.

And a case accommodating the piezoelectric vibrating member and the weight member and sandwiching the first extension part.

A piezoelectric vibrating apparatus according to another aspect of the present invention includes a piezoelectric vibrating member to which a plurality of piezoelectric vibrating plates each having a predetermined width and length are coupled; And a weight member provided at one side and the other side of the piezoelectric vibrating member and coupled to at least a portion of the piezoelectric vibrating member.

And an opening formed in a predetermined region of the piezoelectric vibrating member.

The weight member is provided on one side of the piezoelectric vibrating member, the first weight member having a step in a predetermined region is provided on the first side of the piezoelectric vibrating member, and the other side of the piezoelectric vibrating member. And a second weight member having a second protrusion formed in an area corresponding to the protrusion to surround a predetermined region, wherein the first protrusion penetrates the opening to be coupled to the inside of the second protrusion, and a step of the first protrusion is formed. In contact with one surface of the piezoelectric vibrating member.

It further includes a hole formed in a plurality of areas of the piezoelectric vibrating member.

The weight member includes a first weight member provided at one side of the piezoelectric vibrating member and having a plurality of protrusions, and a second weight member provided at the other side of the piezoelectric vibrating member and having a plurality of holes, and the plurality of protrusions Is inserted into the plurality of holes of the second weight member through the plurality of holes of the piezoelectric vibrating member.

A piezoelectric vibrating apparatus according to embodiments of the present invention includes a piezoelectric vibrating member including a substantially circular central portion and a plurality of extension portions extending outwardly from the central portion, and a weight member inserted and fastened at upper and lower portions of the central portion of the piezoelectric vibrating member, respectively. It includes. That is, the present invention has a form in which two extension portions facing each other act as one piezoelectric vibrating member so as to cross a plurality of piezoelectric vibrating members. Therefore, since a plurality of piezoelectric vibrating members are provided in one piezoelectric vibrating apparatus, the vibration force can be improved as compared with the conventional one in which one piezoelectric vibrating member is provided.

In addition, the weight member penetrates at least a portion of the piezoelectric vibrating member from above and below the piezoelectric vibrating member so that the weight member can amplify the vibration of the piezoelectric vibrating member.

1 and 2 are an exploded perspective view and a combined cross-sectional view of a piezoelectric vibrating apparatus according to an embodiment of the present invention.

3 and 4 is an exploded perspective view and a combined cross-sectional view of a piezoelectric vibrating apparatus according to another embodiment of the present invention.

5 and 6 are graphs of resonance frequency and gravity acceleration of a conventional piezoelectric vibration device and a piezoelectric vibration device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention and to those skilled in the art. It is provided for complete information.

1 and 2 are an exploded perspective view and a cross-sectional view of the piezoelectric vibration device according to an embodiment of the present invention.

1 and 2, the piezoelectric vibrating apparatus according to an exemplary embodiment of the present invention is connected to a piezoelectric vibrating member 100 and a portion of the piezoelectric vibrating member 100 to generate vibrations according to an applied voltage. It may include a weight member 200 for amplifying the vibration of the vibration member 100, and a case 300 provided with a predetermined space therein to accommodate the piezoelectric vibration member 100 and the weight member 300. .

The piezoelectric vibrating member 100 includes a piezoelectric plate 110 and a vibrating plate 120 attached to one surface of the piezoelectric plate 110 to generate vibration by a reverse piezoelectric effect in which bending stress is generated according to voltage application. That is, the piezoelectric plate 110 generates bending stress in the vertical direction according to the applied voltage, and the diaphragm 120 amplifies it to generate vibration. Here, the vibration plate 120 is provided larger than the piezoelectric plate 110, the piezoelectric plate 110 is attached to one surface, for example, a lower surface of the vibration plate 120. In addition, the piezoelectric vibrating member 100 has a structure in which the piezoelectric plate 110 and the vibrating plate 120 are formed with a plurality of

extensions

112 and 122 from the center to the outside. That is, the piezoelectric vibrating member 100 is provided in plural so that the piezoelectric vibrating plate to which the piezoelectric plate 110 and the vibrating plate 120 are coupled has a predetermined width and length. In other words, the plurality of piezoelectric vibrating plates are coupled at the center to provide the piezoelectric vibrating member 100.

The piezoelectric plate 110 may have a predetermined thickness and may be provided in a shape in which a plurality of extension parts are formed from the center to the outward direction. That is, the piezoelectric plate 110 may include a substantially circular central portion 111 and a plurality of extension portions 112 extending outwardly from the edge of the central portion 111. The central portion 111 is provided in a substantially circular shape, and an opening 113 of a predetermined size may be formed in the center thereof. The opening 113 may be provided in a shape corresponding to the shape of the central part 111, that is, substantially circular. In addition, the diameter of the opening 113 may be formed in a size of 1/5 to 1/2 of the diameter of the central portion 111. The extension part 112 may extend outward from the side of the central part 111 and may be formed in plural, for example, eight may be formed. The extension 112 may have a rectangular bar shape having the same width and a predetermined length. That is, the extension part 112 may have the same width of one area that is in contact with the center part 111 and the other area that is farthest from the center part 111. Of course, the extension portion 112 may be wider or narrower as it is farther from one region in contact with the central portion 111. The extension portion 112 may maintain the same width from the central portion 111 to one region, but may have a width from one region to the end. This may become wider or narrower. In addition, the spacing between the plurality of extensions 112 may be the same. That is, since the plurality of extensions 112 are formed in the outward direction from the central portion 111 of a circular shape, the distance between the two extensions 112 may increase as the distance from the central portion 111 increases. The units 112 may all have the same interval. Meanwhile, the radius of the central portion 111 including the opening 113 may be larger than the length of the extension 112. However, the radius of the central portion 111 and the length of the extension portion 112 may be the same, and the radius of the central portion 111 may be shorter than the length of the extension portion 112. The piezoelectric plate 110 may include a substrate and a piezoelectric layer formed on at least one surface thereof. For example, the piezoelectric plate 110 may be formed in a bimorph type in which a piezoelectric layer is formed on both surfaces of the substrate, or may be formed in a unimorph type in which a piezoelectric layer is formed on one surface of the substrate. The piezoelectric layer may be formed by laminating at least one layer. Preferably, the piezoelectric layer may be formed by laminating a plurality of piezoelectric layers. At this time, the substrate and the plurality of piezoelectric layers are formed in a structure including a substantially circular central portion having an approximately circular opening in the center and a plurality of extension portions formed outwardly from the central portion. In addition, electrodes may be formed on upper and lower portions of the piezoelectric layer, respectively. That is, the piezoelectric plate 110 may be implemented by alternately stacking a plurality of piezoelectric layers and a plurality of electrodes. The piezoelectric plate 110 may be integrally formed with the central part 111 and the extension part 112. That is, the piezoelectric plate 110 is formed by forming an electrode in the shape of a center portion and a plurality of extension portions on the piezoelectric layer, stacking a plurality of piezoelectric layers on which the electrode is formed in such a shape, and then removing the region where the electrode is not formed. Can be. Here, the piezoelectric layer may be formed using, for example, PZT (Pb, Zr, Ti), NKN (Na, K, Nb), or BNT (Bi, Na, Ti) -based piezoelectric materials. In addition, the piezoelectric layers may be formed by being polarized in different directions or in the same direction. That is, when a plurality of piezoelectric layers are formed on one surface of the substrate, each piezoelectric layer may be alternately formed with polarizations in opposite directions or in the same direction. On the other hand, the substrate may use a material having a characteristic that can generate vibration while maintaining a structure in which the piezoelectric layer is laminated, for example, a metal, a plastic, or the like may be used. However, the piezoelectric plate 110 may not use a piezoelectric layer and a substrate that is a foreign material. That is, the piezoelectric plate 110 may be provided with a piezoelectric layer that is not polarized at the center thereof, and a plurality of piezoelectric layers polarized in different directions may be stacked on the upper and lower portions thereof. Meanwhile, an electrode pattern (not shown) to which a driving signal is applied may be formed on an upper surface of the piezoelectric plate 110. At least two electrode patterns may be spaced apart from each other, and may be connected to a connection line (not shown) to be connected to the electronic device. That is, the connection line connects the electronic device and the electrode pattern through a predetermined region of the case 300, and the connection line may be insulated from the case 300.

The diaphragm 120 may be provided in the same shape as the piezoelectric plate 110. That is, the diaphragm 120 may include a substantially circular central portion 121 and a plurality of extension portions 122 extending outwardly from the edge of the central portion 121. The central portion 121 may be provided to be the same size or larger than the central portion 111 of the piezoelectric plate 110. That is, the diameter of the central portion 121 may be greater than or equal to the diameter of the central portion 111 of the piezoelectric plate 110. In addition, an opening 123 having a predetermined size may be formed in the center of the central portion 121. The opening 123 may be provided in a shape corresponding to the shape of the central portion 111, that is, substantially circular. In addition, the diameter of the opening 123 may be formed to a size of 1/5 to 1/3 of the diameter of the central portion 121. That is, the opening 123 of the diaphragm 120 may be formed smaller than the opening 113 of the piezoelectric plate 110. For example, the diameter of the opening 123 of the diaphragm 120 may be 1/2 to 1/3 of the diameter of the opening 113 of the piezoelectric plate 110. The extension part 122 may extend outward from the side of the central part 121, and a plurality of extension parts 122 may be formed, for example, eight may be formed. The extension part 122 may be provided in a rectangular bar shape having the same width. That is, the extension portion 122 may have the same width of one region in contact with the central portion 121 and the other region farthest from the central portion 121. Of course, the extension portion 122 may be wider or narrower as it is farther from one region in contact with the central portion 121. The extension portion 122 may maintain the same width from the central portion 121 to one region, but may have a width from one region to the end. This may become wider or narrower. In addition, the spacing between the plurality of extensions 122 may be the same. That is, since the plurality of extension portions 122 are formed in the outward direction from the central portion 121 of a circular shape, the distance between the two extension portions 122 may be farther away from the central portion 121. The unit 122 may all have the same interval. Meanwhile, the radius of the central portion 121 including the opening 123 may be larger than the length of the extension 122. However, the radius of the center portion 121 and the length of the extension portion 122 may be the same, and the radius of the center portion 121 may be shorter than the length of the extension portion 122. The length of the extension part 122 of the diaphragm 120 may be longer than that of the extension part 121 of the piezoelectric plate 110. For example, the length of the extension 122 of the diaphragm 120 and the extension 112 of the piezoelectric plate 110 may be formed in a ratio of 3: 1 to 3: 2. Meanwhile, the diaphragm 120 may be manufactured using metal, plastic, or the like, and may stack at least two different materials by using different materials. In addition, the diaphragm 120 may use a polymer or pulp material. For example, the diaphragm 120 may use a resin film, and a material having a large Young's modulus of 1 MPa to 10 GPa, such as ethylene fluoropropylene rubber or styrene butadiene rubber, may be used. The piezoelectric plate 110 is attached to the lower surface of the diaphragm 120. The piezoelectric plate 110 may be attached by, for example, an adhesive tape (not shown). As the adhesive tape, an adhesive material such as rubber, acrylic or silicone may be used. In addition, an edge of the diaphragm 120 may be sandwiched at the edge of the case 300. That is, the edge of the extension portion 122 of the diaphragm 120 may be sandwiched by the edge of the case 300. Meanwhile, an adhesive (not shown) may be applied to at least one side of the piezoelectric plate 110. For example, the adhesive may be applied to the side from the edge of at least one top surface of the piezoelectric plate 110. That is, an adhesive may be applied to at least one edge of the central portion 111 and the plurality of extension portions 112 of the piezoelectric plate 110. The adhesive is a reinforcing agent for preventing peeling from occurring at the interface between the side of the piezoelectric plate 110 and the adhesive tape. As the adhesive, it is preferable to use a thermosetting adhesive having a low Young's modulus such as urethane or silicone which does not restrain the displacement of the piezoelectric plate 110 as much as possible. The piezoelectric vibrating member 100 maintains an angle of 180 ° from one extension portion, and the other extension portion facing the piezoelectric vibrating member acts as one bar-shaped piezoelectric vibrating member. That is, the other extension portion opposed to the one extension portion acts as one piezoelectric vibrating member. Since eight such extensions are provided, four piezoelectric vibrating members are combined. Therefore, compared with the conventional piezoelectric vibrating apparatus using one piezoelectric vibrating member in the form of bar, the vibration force can be further increased.

The weight member 200 moves the oscillation frequency of the piezoelectric vibrating member 100 to the low frequency band and improves the vibration force of the piezoelectric vibrating member 100. The weight member 200 may use a material such as a metal or a non-metal, and may be provided with a heavier weight than the piezoelectric vibrating member 100. The weight member 200 is provided in a substantially circular shape having a predetermined thickness, and includes a first weight member 210 provided above the piezoelectric vibrating member 100 and a second weight provided below the piezoelectric vibrating member 100. The member 220 is included. That is, the first weight member 210 is provided between the diaphragm 120 and the upper case 310, and the second weight member 220 is provided between the piezoelectric plate 110 and the lower case 320. Therefore, the first and

second weight members

210 and 220 may be provided without being in contact with the case 300 inside the case 300. In addition, the first and

second weight members

210 and 220 may be provided larger than the piezoelectric plate 110 and smaller than the vibration plate 120.

The first weight member 210 has a protrusion 211 formed at the center thereof, and the protrusion 211 has an opening of the piezoelectric vibrating member 100, that is, an opening 123 of the diaphragm 120 and an opening of the piezoelectric plate 110. It is inserted at 113. In addition, the protrusion 211 of the first weight member 210 is provided in a structure in which a step is formed in a predetermined region in the longitudinal direction. That is, the protruding portion 211 is formed from the first protruding region 211a protruding from the surface of the first weight member 210 at a first diameter in a direction opposite thereto, i.e., in a downward direction, from the first protruding region 211a. And a second protruding region 211b protruding with a second diameter smaller than the diameter of the first protruding region 211a. At this time, the step between the first protruding region 211a and the second protruding region 211b, that is, the first protruding region 211a is in contact with one surface of the piezoelectric vibrating member 100, and the second protruding region 211b ) Is inserted into the

openings

123 and 113.

The second weight member 220 has a protrusion 221 formed at the center thereof. The protrusion 221 may be provided to surround the central area of the second weight member 220. That is, the protrusion 221 may be formed in a dam shape so as to surround a predetermined area of the center portion of the second weight member 220 in a circular shape. In this case, the upper surface of the protrusion 221 may be in contact with one surface of the vibration plate 120 through the opening 113 of the piezoelectric plate 110 of the piezoelectric vibrating member 100. That is, the protrusion 221 is smaller than the opening 113 of the piezoelectric plate 110 and larger than the opening 123 of the diaphragm 120, so that the protrusion 221 is inserted into the opening 113 of the piezoelectric plate 110 so as to be upper side. The surface may contact one surface of the diaphragm 120. In this case, the outer diameter of the protrusion 221 of the second weight member 220 may be formed to have the same diameter as the first protrusion area 211a of the protrusion 211 of the first weight member 210. In addition, the inner diameter of the protrusion 221 of the second weight member 220 may be formed to have the same diameter as the second protrusion area 211b of the protrusion 211 of the first weight member 210. Therefore, the second protruding region 211a of the protrusion 211 of the first weight member 210 may be inserted into the protrusion 221 of the second weight member 220 to be fastened. That is, the protrusion 221 of the second weight member 220 is inserted between the lower opening of the piezoelectric vibrating member 100, that is, the opening 113 of the piezoelectric plate 110, and the upper opening of the input vibration vibrating member 100. That is, the second extension region 211b of the protrusion 211 of the first weight member 210 may be inserted into the protrusion 221 through the opening 123 of the diaphragm 120. Meanwhile, the first and

second weight members

210 and 220 may be bonded by an adhesive. That is, an adhesive is provided between the second protruding region 211b of the protrusion 211 of the first weight member 210 and the protrusion 221 of the second weight member 220 to provide the first and second weight members 210. 220 may be bonded to each other, wherein the adhesive may use an adhesive material such as rubber, acrylic, silicone, or the like.

Thus, the weight member 200 coupled with the piezoelectric vibrating member 100 vibrates with the vibration of the piezoelectric vibrating member 100, thereby putting its weight on the vibration. When the weight member 200 is coupled to the piezoelectric vibrating member 100 and the weight of the weight member 200 is loaded, the weight of the vibrating body increases, so that the resonance frequency of the piezoelectric vibrating member 100 vibrates alone. Instead, the vibration force is enhanced. In particular, the vibration force is amplified to the maximum at a specific frequency of the AC drive voltage. The resonant frequency may have a different value depending on the physical resources and the physical characteristics of each component such as the piezoelectric vibrating member 100 and the weight member 200. The vibrating body generates the largest vibration when vibrating at its natural frequency. When the vibrating body is constituted by the piezoelectric vibrating member 100 alone without the weight member 200, since the resonance point of the vibrating body is close to the natural frequency of the piezoelectric plate 110, the piezoelectric vibrating member 100 vibrates at the maximum resonant point thereof. The current value flowing through the plate 110 is relatively high. In contrast, when the vibrating body is composed of a combination of the piezoelectric vibrating member 100 and the weight member 200, the resonance point of the vibrating body is far from the natural frequency of the piezoelectric plate 110, and the vibrating body vibrates at the maximum resonance point thereof. In this case, the current value flowing in the piezoelectric plate 110 is relatively low. In addition, since the latter case is lower than the former case, the current flowing through the piezoelectric vibrating member 100 may significantly reduce power consumption when the weight member 200 is used as the vibrating body.

The case 300 is provided with a predetermined space therein to accommodate the piezoelectric vibrating member 100, the weight member 200, and the like. The case 300 may include an upper case 310 and a lower case 320 respectively provided on the upper side and the lower side. The upper and

lower cases

310 and 320 sandwich the edges of the diaphragm 120 of the piezoelectric vibrating member 100 such that the piezoelectric vibrating member 100 is positioned therein. In addition, the case 300 is spaced apart from the piezoelectric vibrating member 100 and the weight member 200 by a predetermined interval therein to provide a predetermined space. Thus, the space formed with the piezoelectric vibrating member 100 and the weight member 200 inside the case 300 becomes a vibration space. To this end, the upper case 310 may include a first flat portion 311 provided along the edge of the diaphragm 120, a vertical portion 312 extending upward from an inner side of the first flat portion 311, and a first weight. It may include a second planar portion 313 facing the upper surface of the member 210 and provided between the vertical portion 312. At this time, the space between the piezoelectric vibrating member 100 and the weight member 200 and the second planar portion is determined according to the height of the vertical portion. That is, the vibration space is determined according to the height of the vertical portion. In addition, the lower case 320 may be provided in the same shape to face the upper case 310. That is, the first flat portion 321 provided along the edge of the diaphragm 120, the vertical portion 322 extending downward from the inside of the first flat portion 321, and the bottom surface of the second weight member 220. It may include a second planar portion 323 facing the surface and provided between the vertical portion 322.

As described above, the piezoelectric vibrating apparatus according to an exemplary embodiment of the present invention includes a piezoelectric vibrating member including a substantially circular central portion and a plurality of extension portions extending outwardly from the central portion, and inserted into upper and lower portions of the central portion of the piezoelectric vibrating member, respectively. And a weight member that is fastened. That is, the present invention has a form in which two piezoelectric vibrating members facing each other serve as one piezoelectric vibrating member so as to intersect a plurality of piezoelectric vibrating members at a central portion thereof. Therefore, since a plurality of piezoelectric vibrating members are provided in one piezoelectric vibrating apparatus, the vibration force can be improved as compared with the conventional one in which one piezoelectric vibrating member is provided.

3 and 4 are an exploded perspective view and a cross-sectional view of a piezoelectric vibrating apparatus according to another embodiment of the present invention.

3 and 4, a piezoelectric vibration device according to another embodiment of the present invention is coupled to a plurality of portions of the piezoelectric vibrating member 100 and the piezoelectric vibrating member 100 to generate vibrations according to an applied voltage. And a weight member 200 for amplifying the vibration of the piezoelectric vibrating member 100, and a case 300 having a predetermined space therein to accommodate the piezoelectric vibrating member 100 and the weight member 300. Here, the piezoelectric vibrating member 100 includes a piezoelectric plate 110 and a vibrating plate 120 formed with a plurality of extensions from the center to the outside.

The piezoelectric vibrating member 100 includes a piezoelectric plate 110 and a vibrating plate 120 attached to one surface of the piezoelectric plate 110 to generate vibration by a reverse piezoelectric effect in which bending stress is generated according to voltage application. The piezoelectric plate 110 may include an approximately circular center portion 111 and a plurality of extension portions 112 extending outwardly from an edge of the central portion 111. In addition, the diaphragm 110 may include an approximately circular central portion 121 and a plurality of extension portions 122 extending outwardly from the edge of the central portion 121. 112 and the extension portions 122 of the diaphragm 120 may be provided in the same number, for example, eight may be provided. Here, the piezoelectric plate 110 is attached to the lower side of the vibration plate 120, the central portion 111 of the piezoelectric plate 110 and the central portion 121 of the vibration plate 120 may be provided with the same size, the vibration plate 120 The extension part 122 of) may be provided larger than the extension part 112 of the piezoelectric plate 110. In addition, holes 114 and 124 may be formed in predetermined regions of the selected

extensions

112 and 121. For example, holes 114 and 124 may be formed in predetermined regions of the four selected

extensions

112 and 121, respectively, and the angles of 90 °, 180 ° and 270 ° with one

extension

112 and 121, respectively.

Holes

114 and 124 may be formed in the

extension parts

112 and 121 forming the same. That is, in one embodiment of the present invention described with reference to FIGS. 1 and 2, the

openings

113 and 123 are formed in the

central portions

111 and 121 of the piezoelectric vibrating member 100, but another embodiment of the present invention is an extension part.

Holes

114 and 124 are optionally formed in 112 and 122. The piezoelectric vibrating member 100 has two

extension portions

112 and 122 facing each other to maintain an angle of 180 ° as one piezoelectric vibrating member. Therefore, since eight

extensions

112 and 122 are provided, four piezoelectric vibration members are combined.

The weight member 200 is provided in a substantially circular shape having a predetermined thickness, and includes a first weight member 210 provided above the piezoelectric vibrating member 100 and a second weight member provided below the piezoelectric vibrating member 100. 220. That is, the first weight member 210 is provided between the diaphragm 120 and the upper case 310, and the second weight member 220 is provided between the piezoelectric plate 110 and the lower case 320. Therefore, the first and

second weight members

210 and 220 may be provided larger than the piezoelectric plate 110 and smaller than the vibration plate 120. In the first weight member 210, a first protrusion 211 is formed at a central portion thereof, and a plurality of second protrusions 212 are formed at a predetermined region outward from the central portion. In this case, the first and

second protrusions

211 and 212 may be provided in a cylindrical shape, for example, and the first protrusion 211 may be provided at a lower height than the plurality of second protrusions 212 and have a large diameter. have. That is, the first protrusion 211 in the center may be provided with a low width and the second protrusions 212 may be provided with a high width and a narrow width. Here, the first protrusion 211 contacts the surface of the piezoelectric vibrating member 100, and the second protrusion 212 extends downward through the plurality of

holes

114 and 124 of the piezoelectric vibrating member 100. . That is, the first protrusion 211 is in contact with the upper surface of the central portion 121 of the diaphragm 120, the plurality of second protrusions 212 is a plurality of holes 124 of the diaphragm 120 and the piezoelectric plate 110. 114 and extend downward through each. In addition, the second weight member 220 has a protrusion 221 formed at the center thereof. The protrusion 221 may be formed to correspond to the protrusion 211 of the first weight member 210. However, the protrusion 221 of the second weight member 220 may be provided with the same width as the protrusion 211 of the first weight member 210 or may be provided with a small width. The protrusion 221 of the second weight member 220 may contact the lower surface of the piezoelectric vibrating member 100. That is, the protrusion 221 of the second weight member 220 may contact the central portion 111 of the piezoelectric plate 110 of the piezoelectric vibrating member 100. In addition, the second weight member 220 may include a central portion 222 and a plurality of extension portions 223 extending outwardly therefrom. That is, the second weight member 220 may be provided in the same shape as the piezoelectric vibrating member 100. However, the center portion 222 of the second weight member 220 is provided larger than the

center portions

111 and 121 of the piezoelectric vibrating member 100, and the extension portion 223 is the extension portion 112 of the piezoelectric vibrating member 100. , 122). However, the second weight member 220 has a distance from the end of one extension 223 to the end of the other extension 223 opposite it is longer than that of the piezoelectric plate 110, and that of the diaphragm 120. Shorter than In addition, the extension part 223 of the second weight member 220 is provided so as to widen from one area to the other area. That is, the extension part 223 may be provided in a shape that becomes wider as it goes outward from the edge of the center part 222. In addition, a plurality of holes 224 are formed in a predetermined region of the second weight member 220. The plurality of holes 224 may be formed in regions corresponding to the

holes

114 and 124 of the piezoelectric vibrating member 100. The plurality of second protrusions 212 of the first weight member 210 extending through the

holes

114 and 124 of the piezoelectric vibrating member 100 are formed in the plurality of holes 224 of the second weight member 220. Can be inserted. Accordingly, the plurality of second protrusions 212 of the first weight member 210 extends downward from the upper side of the piezoelectric vibrating member 100 and penetrates the piezoelectric vibrating member 100 and the plurality of second weight members 220. Is inserted into the hole 224. Thus, the weight member 200 may be in contact with a plurality of regions of the piezoelectric vibrating member 100. Meanwhile, the first and

second weight members

210 and 220 may be bonded by an adhesive. That is, an adhesive is provided between the plurality of second protrusions 212 of the first weight member 210 and the plurality of holes 224 of the second weight member 220 to provide the first and

second weight members

210 and 220. Can be bonded. In addition, an adhesive is provided between the second protrusion 212 of the first weight member 210 and the plurality of

holes

114 and 124 of the piezoelectric vibrating member 200 to provide the second protrusion 212 and the piezoelectric vibrating member 200. Can be glued.

lower cases

310 and 320 sandwich the edges of the diaphragm 120 of the piezoelectric vibrating member 100 such that the piezoelectric vibrating member 100 is positioned therein. In addition, the case 300 is spaced apart from the piezoelectric vibrating member 100 and the weight member 200 by a predetermined interval therein to provide a predetermined space.

As described above, the piezoelectric vibrating apparatus according to the exemplary embodiment of the present invention includes a piezoelectric vibrating member including a substantially circular central portion and a plurality of extension portions extending outward from the central portion, and the piezoelectric vibrating member inserted downward from the upper side of the piezoelectric vibrating member. And a weight member coupled with the member interposed therebetween. That is, the present invention has a form in which a plurality of piezoelectric vibrating members are coupled to each other since two extension portions facing each other serve as one piezoelectric vibrating member. Further, the piezoelectric vibrating member and the weight member are in contact with each other in the plurality of regions, whereby the weight member can amplify the vibration of the piezoelectric vibrating member.

5 and 6 show the operation characteristics of the conventional piezoelectric vibrating apparatus and the piezoelectric vibrating apparatus according to the present invention as described above. That is, FIGS. 5 and 6 are graphs showing resonance frequencies and gravity accelerations of the conventional piezoelectric vibrating apparatus and the piezoelectric vibrating apparatus according to the exemplary embodiment. Here, the conventional piezoelectric vibrator measures the resonant frequency and gravity acceleration when the length, width and thickness of the piezoelectric vibrating member are 28 mm, 2 mm and 0.3 mm, respectively, and a voltage of 150 V is applied. As shown in FIG. 5, the highest resonance frequency is shown at 208 kHz, and the gravitational acceleration at this time is 1.017 m / s ² . However, the piezoelectric vibrating apparatus of the present invention is manufactured so that the length, width, and thickness of the piezoelectric vibrating members are 21 mm, 2 mm, and 0.37 mm, respectively, so that they overlap at the center and the voltage of 150 V is applied. Gravity acceleration was measured. As shown in FIG. 6, the highest resonance frequency is shown at 224 kHz, and the gravitational acceleration at this time is 3.433 m / s ² . Therefore, the piezoelectric vibration device according to the present invention has a higher resonance frequency and gravity acceleration than the conventional piezoelectric vibration device.

On the other hand, the embodiments of the present invention has a piezoelectric vibrating member implemented by including a substantially circular central portion and a plurality of extension portions extending outward from the central portion. However, the present invention may be provided in various shapes in addition to the center portion. For example, a central portion may be provided in a bar shape having a predetermined width and length, and a plurality of extensions may be provided on at least one side of the central portion to implement a piezoelectric vibrating member.

Although the technical spirit of the present invention has been described in detail according to the above embodiment, it should be noted that the above embodiment is for the purpose of description and not for the purpose of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

Claims

A piezoelectric vibrating member vibrating according to a predetermined voltage; And

A weight member in contact with at least a portion of the piezoelectric vibrating member to amplify the vibration of the piezoelectric vibrating member,

The piezoelectric vibrating member is provided with a plurality of extensions in the horizontal direction from the center, the weight member is coupled through at least a portion of the piezoelectric vibrating member on one side and the other side of the piezoelectric vibrating member.
The method according to claim 1, wherein the piezoelectric vibrating member,

A diaphragm including a first central portion and a plurality of first extension portions extending outwardly from the first central portion; And

And a piezoelectric plate including a second center portion in contact with the first center portion and a plurality of second extensions extending outwardly from the second center portion and in contact with the plurality of first extensions, respectively.
The piezoelectric vibrating apparatus of claim 2, wherein the first and second extensions have a predetermined width and length, and the length of the first extension is longer than the length of the second extension.
The piezoelectric vibrating apparatus according to claim 3, further comprising a first opening formed in a predetermined region of the first central portion, and a second opening formed in the second central portion of a region corresponding to the first opening.
The method of claim 4, wherein the weight member comprises a first and second weight member provided on one side and the other side of the piezoelectric vibrating member,

A piezoelectric vibrator having first and second protrusions formed in regions corresponding to the first and second openings on one surface of the first and second weight members facing each other.
The method of claim 5, wherein the first protrusion has a step in the protrusion direction including a first protrusion region having a first width in the protrusion direction, and a second protrusion region narrower than the first width,

And the second protrusion is provided with a space surrounding the second protrusion area.
The piezoelectric vibrating apparatus of claim 6, wherein the first protruding region is in contact with one surface of the piezoelectric vibrating member, and the second protruding region is coupled to the inside of the second protrusion through the first and second openings.
The piezoelectric vibrating apparatus according to claim 3, further comprising: a plurality of first holes formed in the vibrating plate, and a plurality of second holes formed in a region corresponding to the plurality of first holes of the piezoelectric plate.
The method of claim 8, wherein the weight member is provided on one side of the piezoelectric vibrating member and a first weight member having a plurality of first protrusions,

And a second weight member provided at the other side of the piezoelectric vibrating member and having a plurality of third holes.
The piezoelectric vibrating apparatus of claim 9, wherein the plurality of first protrusions are inserted into the plurality of third holes through the plurality of first and second holes of the piezoelectric vibrating member.
The display apparatus of claim 10, wherein the second protrusion is formed on the first weight member and is spaced apart from the plurality of first protrusions and is in contact with one surface of the piezoelectric vibrating member, and the second hole is spaced apart from the third hole. And a third protrusion formed on the weight member and in contact with the other surface of the piezoelectric vibration member.
The piezoelectric vibration device according to claim 3, further comprising a case accommodating the piezoelectric vibrating member and the weight member and sandwiching the first extension part.
A piezoelectric vibrating member to which a plurality of piezoelectric vibrating plates each having a predetermined width and length are coupled; And

Piezoelectric vibration device including a weight member provided on one side and the other side of the piezoelectric vibrating member and penetrates through at least a portion of the piezoelectric vibrating member.
The piezoelectric vibrating apparatus according to claim 13, further comprising an opening formed in a predetermined region of the piezoelectric vibrating member.
15. The method of claim 14, wherein the weight member is provided on one side of the piezoelectric vibrating member, the first weight member having a stepped portion in the predetermined region in the direction of the piezoelectric vibrating member, and

A second weight member provided on the other side of the piezoelectric vibrating member and having a second protrusion formed in a region corresponding to the first protrusion to surround a predetermined region;

And the first protrusion is coupled to the inside of the second protrusion through the opening, and the step of the first protrusion is in contact with one surface of the piezoelectric vibrating member.
The piezoelectric vibrating apparatus according to claim 15, further comprising holes formed in a plurality of regions of the piezoelectric vibrating member.
The method of claim 16, wherein the weight member is provided on one side of the piezoelectric vibrating member and a first weight member having a plurality of protrusions,

A second weight member provided on the other side of the piezoelectric vibrating member and having a plurality of holes formed therein;

And the plurality of protrusions penetrate through the plurality of holes of the piezoelectric vibrating member and are inserted into the plurality of holes of the second weight member.