KR20140138002A - Vibrator and electronic device including the same - Google Patents

Abstract

The present invention relates to a vibrator and an electronic device including the same. The present invention includes: a housing including an internal space; an elastic member installed in the internal space; a piezo device in which one surface thereof is installed on the elastic member; and a polymer fixed on the other side of the piezo device using a buffering adhesive.

Description

TECHNICAL FIELD [0001] The present invention relates to a vibration generating device and an electronic device including the vibration generating device.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generating apparatus and an electronic apparatus including the same.

The vibration generator is a device for converting electrical energy into mechanical vibration using the principle of generating electromagnetic force, and is mounted on a mobile phone or the like to be used for silent incoming notification. In addition, as the market for mobile devices such as mobile phones is rapidly expanding, and various functions are added to mobile devices, there is a demand for miniaturization and high quality of mobile devices. In addition, And the development of a new structure product that dramatically improves the quality has emerged.

Furthermore, as the launch of smart phones in mobile phones has surged and the touch screen method has been adopted, the use of vibration motors has been increasingly used to generate vibrations during touch. Particularly, the performance required for vibration during touch on the touch screen is required to increase the operation life time as the number of times of use increases as compared with the occurrence of vibration at the first incoming call. In response to the speed of touching the second screen, So that the user can feel the vibration when touching.

As a product capable of realizing such characteristics, there is a Piezo Haptic Actuator. This principle is based on the principle of the inverse piezoelectric effect in which a displacement occurs when a voltage is applied to the piezo element. The principle is to generate a vibration force by moving the weight of the mover using the generated displacement.

A characteristic of the vibrator having this structure is that it can realize various vibration characteristics because it has a wide frequency bandwidth capable of obtaining a vibration force equal to or higher than a certain level. In addition, it can be realized that it is suitable for realizing haptic vibration of mobile devices such as mobile phones because it can realize quick operation response characteristics.

However, there is a problem that the phi element is easily damaged by an external impact. In other words, when the finger device is disposed on the bottom surface of the elastic plate of the mover, there is a problem that the finger device easily breaks due to contact between the finger device and the lower case during an external impact.

In particular, the elastic plate may be deformed or broken by an external impact applied in the longitudinal direction of the vibration generating device, so that the piezo elements mounted on the elastic plate may be damaged.

Disclosure of Invention Technical Problem [8] The present invention is intended to solve the above-mentioned problems, and it is an object of the present invention to provide a vibration generating device which prevents contact between a finger element and a mover even when an external impact or the like occurs.

It is another object of the present invention to provide a vibration generating device capable of not only preventing contact between a finger element and a mover but also absorbing a shock.

According to an aspect of the present invention, there is provided a vibration generator including: a housing having an inner space; An elastic member mounted on the inner space; A piezoelectric element mounted on one side of the elastic member; And a weight body fixed to the other surface of the piezoelectric element through a buffer adhesive.

In the vibration generating device according to an embodiment of the present invention, the buffer adhesive may include a substrate having buffering properties; And a pressure sensitive adhesive applied on both sides of the substrate.

In the vibration generator according to the embodiment of the present invention, the substrate may be porous.

In the vibration generator according to the embodiment of the present invention, the substrate may have an elastic force.

In the vibration generating apparatus according to an embodiment of the present invention, the elastic member may include a bottom plate on which the piezoelectric element is mounted.

In the vibration generating apparatus according to an embodiment of the present invention, the elastic member may further include an extension plate extending in the height direction at both ends in the width direction of the bottom plate.

In the vibration generator according to an embodiment of the present invention, the extension plate includes: a connection portion having one end connected to the bottom plate and extending in a height direction at a longitudinal center portion of the bottom plate; And a support plate part provided at the other end of the connection part in the longitudinal direction to guide the weight.

In the vibration generating apparatus according to an embodiment of the present invention, the buffer adhesive may be provided in a shorter length than the piezoelectric element in the longitudinal direction.

In the vibration generating apparatus according to an embodiment of the present invention, the buffer adhesive may have a width equal to or less than the width of the piezoelectric element.

The vibrating device according to an embodiment of the present invention may further include a weight cover surrounding the weight, and the buffer adhesive may be interposed between the weight cover and the piezoelectric element.

In the vibration generating apparatus according to an embodiment of the present invention, the buffer adhesive may be a pressure-sensitive adhesive having a buffering force.

In the vibration generator according to an embodiment of the present invention, the longitudinal gap between the end of the weight and the inner surface of the housing may be less than the elastic limit of the cushioning adhesive.

In the vibration generator according to an embodiment of the present invention, the weight and the elastic member may not contact each other.

According to an aspect of the present invention, there is provided a vibration generator including: a housing having an inner space; An elastic member mounted on the inner space; A piezoelectric element mounted on one side of the elastic member; And a weight body that is cushion-coupled with the piezoelectric element or the elastic member and generates a displacement by deformation of the piezoelectric element.

According to an aspect of the present invention, there is provided a vibration generator including: a housing having an inner space; An elastic member mounted on the inner space; A piezoelectric element mounted on one surface of the elastic member; And a weight body fixed to the other surface of the elastic member through a buffer adhesive.

An electronic device according to an embodiment of the present invention includes a display module for displaying an image according to a user's selection; A case having an inner space for accommodating the display module; A piezoelectric element mounted on one side of the elastic member and adapted to vibrate the elastic member by deformation; and a piezoelectric element mounted on the piezoelectric element or the piezoelectric element, And a vibration generating device including a weight which is cushion-coupled with the elastic member.

In the electronic device according to the embodiment of the present invention, the vibration generating device may be mounted on the inner surface of the case.

In the electronic device according to an embodiment of the present invention, the vibration generating device may be mounted on a lower surface of the display module.

In the electronic device according to an embodiment of the present invention, the display module includes: a touch panel that receives a user's touch; And a display panel contacting the lower surface of the touch panel and providing a corresponding image according to the touch of the touch panel.

By using the present invention, it is possible to provide a vibration generating device that prevents contact between a piezo element and a mover even when an external impact or the like occurs. That is, even when an external impact or the like is applied to the vibration generating device, the impact due to inertia of the mass can be prevented from being directly applied to the element by the cushioning adhesive interposed between the weight and the element. That is, it is possible to prevent the impact applied from the outside from being absorbed or blocked by the cushioning adhesive and the damage of the element.

Further, by using the present invention, it is possible to provide a vibration generating device that can not only prevent contact between a finger element and a mover, but also absorb shock.

1 is a cross-sectional view of a vibration generator according to an embodiment of the present invention,
2 is an exploded perspective view of a vibration generating device according to an embodiment of the present invention,
3 is a perspective view of an upper case of a vibration generating device according to an embodiment of the present invention,
4 is a perspective view of a lower case of a vibration generating device according to an embodiment of the present invention,
5A is a plan view and a perspective view showing an elastic member of the vibration generating device according to an embodiment of the present invention,
5B is a plan view and a perspective view showing an elastic member of the vibration generating device according to another embodiment of the present invention,
6 is a bottom perspective view showing a piezoelectric element of a vibration generating device according to an embodiment of the present invention,
7A is a bottom perspective view showing a weight of a vibration generator according to an embodiment of the present invention,
7B is a perspective view showing a shape in which the weight cover of the vibration generating device according to the embodiment of the present invention is covered with the weight cover,
8 is a perspective view showing a circuit board of a vibration generator according to an embodiment of the present invention,
9 is a cross-sectional view of a cushioning adhesive of a vibration generating device according to an embodiment of the present invention,
10 is a cross-sectional view of a vibration generator according to another embodiment of the present invention,
11 is an exploded perspective view of a vibration generator according to another embodiment of the present invention,
12A is a plan view and a perspective view showing an elastic member of a vibration generator according to another embodiment of the present invention,
12B is a plan view and a perspective view showing an elastic member of the vibration generator according to still another embodiment of the present invention,
13 is a perspective view of an electronic device according to an embodiment of the present invention,
14 is a cross-sectional view of an electronic device according to an embodiment of the present invention,
15 is a cross-sectional view of an electronic device according to another embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

The vibration generating apparatus 100 according to the embodiment of the present invention may be constructed so that the weight is disposed on the piezoelectric element via a cushioning material having an adhesive force between the weight and the piezoelectric element, (For example, upper surface) of the elastic member, the above-mentioned problem that the piezoelectric element is damaged by contact with the elastic member or the like upon external impact can be solved have.

FIG. 1 is a cross-sectional view of a vibration generator according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a vibration generator according to an embodiment of the present invention.

1 and 2, the vibration generator 100 includes a housing 120 including an upper case 122 and a lower case 130, an elastic member 140, a piezoelectric element 160, 180, a circuit board 200, a buffer member 220, a damper member 240, and a buffer adhesive 260. In addition, a stopper 270 and a buffer member 280 interposed between the elastic member 140 and the lower case 130 may be further included.

The housing 120 may include an upper case 122 and a lower case 130. The upper case 122 may have a box shape having an inner space, and the lower case 130 may have a plate shape. 3 is a perspective view showing an upper case 122 of the housing 120. As shown in Fig.

If the term for direction is defined here, the longitudinal direction means the X direction in FIG. 3, and the width direction means the Y direction in FIG. The height direction means the Z direction in Fig. The terms defined above are to be used in the same manner in the following. That is, the above-described terms for the respective configurations are assumed to indicate the same direction.

4 is a perspective view of a lower case of a vibration generator according to an embodiment of the present invention.

The lower case 130 may have a plate shape as shown in FIG. A protrusion 132 for supporting both ends of the elastic member 140 (see FIG. 1) may be formed on both end sides of the lower case 130. The protrusion 132 may be formed by denting, and may have a quadrangular prism shape. However, the present invention is not limited thereto.

A through hole 134 may be formed at the center of the lower case 130 so that the buffer member 220 can pass through. The shape of the through hole 134 can be variously changed.

5A is a plan view and a perspective view showing an elastic member of a vibration generator according to an embodiment of the present invention.

5A, the elastic member 140 may be provided in a plate shape, and both ends of the elastic member 140 in the longitudinal direction are supported by a protrusion 142e (see FIG. 4) of the lower case 122 .

The elastic member 140 in the form of a plate may be provided with a plurality of support protrusions 142a and 142b for mounting the piezoelectric element 160 (see FIG. 1). The two support protrusions 142a support both side surfaces of the piezoelectric element 160 and the other support protrusions 142b support the other two sides (front surface and back surface) of the piezoelectric element 160 except for both side surfaces. Accordingly, the piezoelectric element 160 can be installed at a predetermined position, and the piezoelectric element 160 can be prevented from being separated from the bottom plate 142.

5B is a plan view and a perspective view showing an elastic member of the vibration generator according to another embodiment of the present invention. The elastic member according to another embodiment may further include an extension plate 144 in addition to the elastic member according to the embodiment. Hereinafter, it will be described in detail.

Referring to FIG. 5B, the elastic member 140 may include a bottom plate 142 and an extension plate 144. First, referring to the bottom plate 142 of the elastic member 140, a plurality of support protrusions 142a and 142b for mounting the piezoelectric element 160 (see FIG. 1) may be provided on the bottom plate 142 . The two support protrusions 142a support both side surfaces of the piezoelectric element 160 and the other support protrusions 142b support the other two sides (front surface and back surface) of the piezoelectric element 160 except for both side surfaces. Accordingly, the piezoelectric element 160 can be installed at a predetermined position, and the piezoelectric element 160 can be prevented from being separated from the bottom plate 142.

At both ends of the bottom plate 142, a support portion 142e supported by the projecting portion 132 (see FIG. 4) of the lower case 122 may be provided.

The extension plate 144 may include a connecting portion 148 connecting the support plate 146 and the bottom plate 142 to cover the front and rear surfaces of the weight 180. [

The connecting portion 148 extends from the front surface and the rear surface of the bottom plate 142. The connection part may include first and second connection parts 148a and 148b spaced apart from each other by a predetermined distance.

Further, the support plate 146 may extend in the longitudinal direction of the weight 180.

6 is a bottom perspective view showing a piezoelectric element of a vibration generating device according to an embodiment of the present invention.

6, the piezoelectric element 160 is fixed to the bottom plate 142 of the elastic member 140 (see FIGS. 5A and 5B) as described above, and may have a rectangular parallelepiped shape.

In addition, an electrode 162 may be provided on the bottom surface of the piezoelectric element 160. The electrode 162 may protrude from the bottom surface of the piezoelectric element 160 and may include a positive electrode 162a and a negative electrode 162b.

7A is a bottom perspective view showing a weight of a vibration generator according to an embodiment of the present invention.

Referring to FIG. 7A, the weight 180 may have a bar shape.

At both ends of the piezoelectric element 160, a stopper portion 184 for limiting the displacement of the weight 180 when the elastic member 140 is elastically deformed may be formed. That is, the stopper portion 184 contacts the end portion of the bottom plate 142 of the elastic member 140, so that the displacement of the weight 180 can be restricted. Thus, contact between the weight 180 and the bottom plate 142 at the inner side of both ends can be prevented.

The weight 180 may be buffer-coupled to the piezoelectric element 160. For example, the weight 180 may be attached to the piezoelectric element 160 through a cushioning adhesive 260. The buffer adhesive 260 may be an adhesive, a double-sided tape or the like as a buffer having an adhesive force (or adhesive force). That is, since the cushioning adhesive 260 is a material capable of absorbing impact while bonding the weight 180 and the piezoelectric element 160 by bonding, a soft adhesive such as a poron, silicone, rubber, or poly Or an adhesive (or an adhesive) containing them. When the buffer adhesive 260 is provided as an adhesive or an adhesive, the adhesive or the adhesive may be a silicone resin.

Since the piezoelectric element 160 continuously repeats expansion, contraction, and banding, the buffer adhesive 260 should not interfere with the shape deformation. Detailed embodiments of the structure will be described later in detail with reference to Fig.

The buffer adhesive 260 may be shorter than the piezoelectric element 160 in the longitudinal direction. The buffer adhesive 260 may have a width equal to or less than that of the piezoelectric element 160. The size of the cushioning adhesive 260 can be variously used within a range that does not hinder the shape deformation of the piezoelectric element 160.

In addition, the weight 180 may be disposed on the piezoelectric element 160 in a state of being mounted on the weight cover 170 to be described later. In this case, the weight cover 170 and the piezoelectric element 160 may be attached to each other via the buffer adhesive 260.

Meanwhile, the buffer adhesive 260 should have an elastic force for restoring the weight 180 to the original position when the weight 180 moves to one side due to an inertial force due to an external impact.

The elastic force should be sufficient to restore the weight 180 to its original position.

Accordingly, in the present invention, the longitudinal distance between the end of the weight 180 and the inner surface of the housing 300 may be less than the elastic limit of the buffer adhesive. That is, when the gap is less than the elastic limit of the cushioning adhesive 260, the housing 300 serves as a longitudinal deformation stopper of the weight 180, The cushioning adhesive 260 can sufficiently perform its role.

The longitudinal distance between the end of the weight 180 and the inner surface of the housing 300 may be less than or equal to 3 mm and the elastic limit of the cushioning adhesive 260 may be greater than or equal to 3 mm.

Since the weight 180 is not directly coupled to the elastic member 140 but coupled to the piezoelectric element 160 through the buffer adhesive 260, the elastic member 140 can be deformed .

That is, although the elastic member 140 serves to provide an elastic force according to the shape deformation of the piezoelectric element 160, since the elastic member 140 is not directly coupled with the weight 180, The impact generated by the inertia force of the weight 180 may not be transmitted directly to the elastic member 140. [ Accordingly, the reliability of the elastic member 140 can be improved.

FIG. 7B is a perspective view showing a shape in which a weight cover is covered with a weight of a vibration generator according to an embodiment of the present invention. FIG.

7B, the weight 180 may be coupled to the piezoelectric element 160 via the cushioning adhesive 260 in a state of being inserted into the weight cover 170. As shown in FIG. The weight cover 170 may be provided in a shape that allows the weight 180 to be inserted therein.

That is, a bottom plate 172 and a mounting plate 173 for supporting the bottom of the weight 180 are disposed on the bottom plate 172 and the mounting plate 173 in the lateral direction of the weight 180 As shown in FIG. The support plate 175 may include front and rear support plates 177 and 177 for supporting the front and rear surfaces of the weight 180 and an end support plate 178 for supporting the ends.

The end support plate 178 may protrude from the longitudinal end of the front and rear support plates 176 and 177 in the direction of the end face of the weight 180.

Although the bottom plate 172 and the mounting plate 173 are shown discontinuously in the longitudinal direction in the drawing, the bottom plate 172 and the mounting plate 173 are not limited thereto, and they may be integrally provided and continuously provided in the longitudinal direction.

8 is a perspective view showing a circuit board of a vibration generator according to an embodiment of the present invention.

Referring to FIG. 9, the circuit board 200 is connected to the piezoelectric element 160 (see FIG. 1), and can be oscillated in conjunction with the elastic member 140. For this purpose, the circuit board 200 may be provided with a piezoelectric element connection part 202. An insertion hole 204 into which the electrode 162 of the piezoelectric element 160 is inserted may be formed in the piezoelectric element connection portion 202.

Accordingly, the solder for connecting the piezoelectric actuator 160 and the circuit board 200 can be disposed in the opening 142c of the bottom plate 142, thereby suppressing an increase in thickness due to the solder.

The piezoelectric element connection part 202 may be formed to be stepped with the body 206. For this purpose, the piezoelectric element connection part 202 and the body 206 may be connected by the inclined part 205. [ The inclined portion 205 may be formed with a support protrusion insertion hole 205a into which the support protrusion 142a of the bottom plate 142 is inserted.

A plurality of holes and grooves may be formed in the body 206 so as to be smoothly oscillated in cooperation with the bottom plate 142.

The circuit board 200 is provided with a power connection terminal 208a and an external exposed portion 208 which is drawn out to the outside of the upper case 122 (see FIG. 1). The external exposed portion 208 may be stepped with the body 206.

9 is a cross-sectional view of a cushioning adhesive of a vibration generating device according to an embodiment of the present invention.

Referring to FIG. 9, the buffer adhesive 260 according to an embodiment of the present invention may include a substrate 261 having a buffering property and a pressure-sensitive adhesive 263 applied to both sides of the substrate 261.

The substrate 261 may have buffering characteristics (i.e., buffering force). Thus, the base material 261 may be porous and foamable so as to have excellent buffering characteristics. The base material 261 may have an elastic force. The substrate 261 may be, for example, a poron, a silicone, a rubber, a poly-material (e.g., polyurethane) or the like. The pressure sensitive adhesive 263 is excellent in adhesion, and may be, for example, an acrylic pressure sensitive adhesive. Of course, the substrate 261 and the pressure-sensitive adhesive 253 are not limited thereto, and various ones can be used.

FIG. 10 is an exploded perspective view of a vibration generator according to another embodiment of the present invention, and FIG. 12A is a cross-sectional view of a vibration generator according to another embodiment of the present invention, And FIG. 12B is a plan view and a perspective view showing an elastic member of the vibration generator according to still another embodiment of the present invention.

10 to 12B, a vibration generating apparatus 100 'according to another embodiment of the present invention includes a piezoelectric element 160' provided on a lower surface of an elastic member 140 ' And may be coupled to the upper surface of the elastic member 140 'via a buffer adhesive 260. Except for the differences described above, the vibration generating apparatus 100 according to the embodiment of the present invention is the same as the vibration generating apparatus 100 according to the embodiment of the present invention. Therefore, the detailed description of the different components will be omitted and the same reference numerals will be used for the same components.

The vibration generating apparatus 100 'according to another embodiment includes a housing 120 including an upper case 122 and a lower case 130, an elastic member 140', a piezoelectric element 160 ', a weight 180 ), A circuit board (200), and a buffer adhesive (260).

12A, the elastic member 140 'may be provided in a plate shape. Both end portions of the elastic member 140' in the longitudinal direction are supported by a support portion 142e (see FIG. 4) supported by the projecting portion 132 May be provided.

In addition, the plate-shaped elastic member 140 'may be provided with a plurality of support protrusions 142a', 142b 'for mounting the piezoelectric element 160'. The two support protrusions 142a 'support both side surfaces of the piezoelectric element 160' and the remaining support protrusions 142b 'support the other two sides (front surface and back surface) of the piezoelectric element 160' . Accordingly, the piezoelectric element 160 'can be installed at a predetermined position, and the piezoelectric element 160' can be prevented from being separated from the bottom plate 142.

Meanwhile, in the vibration generating apparatus 100 'according to another embodiment, the piezoelectric element 160' may be provided on a lower surface of the elastic member 140 '. Accordingly, the plurality of support protrusions 142a ', 142b' can protrude in the lower direction of the elastic member 140 '.

Referring to FIG. 12B, the elastic member 140 'may include a bottom plate 142 and an extension plate 144. Referring to the bottom plate 142 of the elastic member 140 ', the bottom plate 142 is provided with a plurality of support protrusions 142a' and 142b 'for mounting the piezoelectric element 160' . The two support protrusions 142a 'support both side surfaces of the piezoelectric element 160' and the remaining support protrusions 142b 'support the other two sides (front surface and back surface) of the piezoelectric element 160' . Accordingly, the piezoelectric element 160 'can be installed at a predetermined position, and the piezoelectric element 160' can be prevented from being separated from the bottom plate 142.

Meanwhile, in the vibration generating apparatus 100 'according to another embodiment, the piezoelectric element 160' may be provided on a lower surface of the elastic member 140 '. Accordingly, the plurality of support protrusions 142a ', 142b' can protrude in the lower direction of the elastic member 140 '.

At both ends of the bottom plate 142, a support portion 142e supported by the projecting portion 132 (see FIG. 4) of the lower case 122 may be provided.

The extension plate 144 may include a connecting portion 148 connecting the support plate 146 and the bottom plate 142 to cover the front and rear surfaces of the weight 180. [

The connecting portion 148 extends from the front surface and the rear surface of the bottom plate 142. The connection part may include first and second connection parts 148a and 148b spaced apart from each other by a predetermined distance.

Further, the support plate 146 may extend in the longitudinal direction of the weight 180.

Here, the extension plate 144 may protrude toward the upper surface of the elastic member 140 '. That is, the piezoelectric element 160 'may protrude in a direction opposite to the direction in which the piezoelectric element 160' is installed.

In the vibration generating apparatus 100 'according to another embodiment, the weight 180 may be buffer-coupled to the upper surface of the elastic member 140'. For example, the weight 180 may be attached to the upper surface of the elastic member 140 'via a buffering adhesive 260. The piezoelectric element 160 'may be provided on a lower surface of the elastic member 140'.

The cushioning adhesive 260 may be shorter than the piezoelectric element 160 'in the longitudinal direction. The buffer adhesive 260 may have a width equal to or less than that of the piezoelectric element 160 '. The size of the cushioning adhesive 260 can be variously used within a range that does not disturb the shape deformation of the piezoelectric element 160 '.

In addition, the weight 180 may be disposed on the elastic member 140 'in a state of being mounted on the weight cover 170 described above. In this case, the weight cover 170 and the elastic member 140 'may be attached to each other via the buffer adhesive 260.

Meanwhile, the buffer adhesive 260 should have an elastic force for restoring the weight 180 to the original position when the weight 180 moves to one side due to an inertial force due to an external impact. The elastic force should be sufficient to restore the weight 180 to its original position. Accordingly, in the present invention, the longitudinal distance between the end of the weight 180 and the inner surface of the housing 300 may be less than the elastic limit of the buffer adhesive. That is, when the gap is less than the elastic limit of the cushioning adhesive 260, the housing 300 serves as a longitudinal deformation stopper of the weight 180, The cushioning adhesive 260 can sufficiently perform its role. The longitudinal distance between the end of the weight 180 and the inner surface of the housing 300 may be less than or equal to 3 mm and the elastic limit of the cushioning adhesive 260 may be greater than or equal to 3 mm.

Since the weight 180 is not directly coupled to the elastic member 140 but is coupled via the buffer adhesive 260, the elastic member 140 may not be deformed even when an external impact or the like occurs. That is, although the elastic member 140 serves to provide an elastic force according to the shape deformation of the piezoelectric element 160, since the elastic member 140 is not directly coupled with the weight 180, The impact generated by the inertia force of the weight 180 may not be transmitted directly to the elastic member 140. [ Accordingly, the reliability of the elastic member 140 can be improved.

Since the weight 180 is not directly coupled to the elastic member 140 but is coupled to the elastic member 140 or the piezoelectric element 160 via the buffer adhesive 260 as described above, The elastic member 140 may not be deformed. That is, although the elastic member 140 serves to provide an elastic force according to the shape deformation of the piezoelectric actuator 160, since the elastic member 140 is not directly coupled with the weight 180, The impact generated by the inertia force of the weight 180 may not be transmitted directly to the elastic member 140. [ Accordingly, the reliability of the elastic member 140 can be improved.

The vibration generating device 100 described above can be utilized in various electronic devices.

FIG. 13 is a perspective view of an electronic device according to an embodiment of the present invention, FIG. 14 is a sectional view of an electronic device according to an embodiment of the present invention, and FIG. 15 is a sectional view of an electronic device according to another embodiment of the present invention .

13 to 15, the electronic device 1000 of the present invention can display an image according to a user's selection.

14, an embodiment of an electronic device 1000 of the present invention may comprise a display module for displaying an image according to a user's choice and a case 1400 having an internal space for receiving the display module .

The display module may include a touch panel 1200 for providing a contact pressure of a user and a display panel 1300 mounted on a lower surface of the touch panel 1200 to provide an image according to a user's selection. The vibration generating apparatus 100 may be mounted on a lower surface of the display panel 1300 to provide vibration according to a user's selection.

15, the vibration device 100 of the present invention may be mounted on the inner surface of the case 1400 to provide direct vibration to the display module.

As described above, according to the present invention, in order to increase the driving force by increasing the mass of the vibration plate by increasing the driving force by adding mass to the point where the displacement of the vibration plate is highest, the vibration device and the electronic device Can be lightly shortened.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the particular forms disclosed. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Vibration generator
120: Housing
140: elastic member
160: piezoelectric element
180: Weight
200: circuit board
220: buffer member
240: damper member
260: Buffering adhesive
270: Stopper
280: buffer member

Claims (19)

A housing having an inner space;
An elastic member mounted on the inner space;
A piezoelectric element mounted on one side of the elastic member; And
And a weight body fixed to the other surface of the piezoelectric element through a buffer adhesive.
The cushioning adhesive according to claim 1,
A substrate having buffering properties; And
And a pressure sensitive adhesive applied to both sides of the substrate.
3. The method of claim 2,
Wherein the substrate is porous.
3. The method of claim 2,
Wherein the base material has an elastic force.
The elastic member according to claim 1,
And a bottom plate on which the piezoelectric element is mounted.
6. The connector according to claim 5,
And an extension plate extending in the height direction at both ends in the width direction of the bottom plate.
The apparatus as claimed in claim 6,
A connecting portion, one end of which is connected to the bottom plate and extends in the height direction at the longitudinal center portion of the bottom plate; And
And a support plate part provided at the other end of the connection part in the longitudinal direction to guide the weight.
The method according to claim 1,
Wherein the buffer adhesive is provided in a shorter length than the piezoelectric element in the longitudinal direction.
The method according to claim 1,
Wherein the buffer adhesive has a width equal to or smaller than that of the piezoelectric element.
The method according to claim 1,
And a weight cover surrounding the weight body,
Wherein the buffer adhesive is interposed between the weight cover and the piezoelectric element.
The method according to claim 1,
Wherein the buffer adhesive is a pressure-sensitive adhesive having a buffering force.
The method according to claim 1,
Wherein the longitudinal distance between the end of the weight and the inner surface of the housing is less than the elastic limit of the cushioning adhesive.
The method according to claim 1,
Wherein the weight member and the elastic member are not in contact with each other.
A housing having an inner space;
An elastic member mounted on the inner space;
A piezoelectric element mounted on one side of the elastic member; And
And a weight body which is cushion-coupled to the piezoelectric element or the elastic member and which is displaced by deformation of the piezoelectric element.
A housing having an inner space;
An elastic member mounted on the inner space;
A piezoelectric element mounted on one surface of the elastic member; And
And a weight member fixed to the other surface of the elastic member through a buffer adhesive.
A display module for displaying an image according to a user's selection;
A case having an inner space for accommodating the display module;
A piezoelectric element mounted on one side of the elastic member and adapted to vibrate the elastic member by deformation; and a piezoelectric element mounted on the piezoelectric element or the piezoelectric element, And a vibration generating device including a weight which is buffer-coupled with the elastic member.
17. The method of claim 16,
Wherein the vibration generating device is mounted on the inner surface of the case.
17. The method of claim 16,
Wherein the vibration generating device is mounted on a lower surface of the display module.
17. The display device of claim 16,
A touch panel that receives a touch of a user; And
And a display panel that contacts the lower surface of the touch panel and provides a corresponding image according to the touch of the touch panel.

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