KR20150089336A - Vibrator - Google Patents

Abstract

The present invention relates to a vibration generator. The vibration generator comprises: a housing having an inner space; an elastic member of which both ends are fixated to a housing to enable the elastic member to be disposed to be elastically deformed in an inner space; and a piezoelectric element installed in one surface of the elastic member. The elastic member has an elastically bent portion protruding to an opposite side to one side where the piezoelectric element is installed; except for a portion where the piezoelectric element is installed.

Description

[0001] VIBRATOR [0002]

The present invention relates to a vibration generating apparatus.

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.

The characteristic of the oscillator having this structure is that it can realize a stable vibration characteristic because it has a wide frequency bandwidth to obtain a certain level of vibration power and can use various low and high frequency vibrations instead of a single frequency in a constant frequency range . 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.

On the other hand, the piezo elements generating such vibration are mounted on the elastic member and vibrate. When the elastic member is brought into contact with the housing due to the inertia force of the mass mounted on the elastic member at the time of external impact So that it is damaged or deformed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vibration generating device for preventing breakage or deformation of an elastic member.

According to an aspect of the present invention, there is provided a vibration generator including: a housing having an inner space; An elastic member whose both ends are fixed to the housing so as to be disposed in the inner space so as to be elastically deformable; And a piezoelectric element mounted on one surface of the elastic member, wherein the elastic member may have an elastic bend portion protruding from a surface opposite to a surface on which the piezoelectric element is mounted other than a portion on which the piezoelectric element is mounted.

In the vibration generating device according to the embodiment of the present invention

The elastic bend may be provided between both ends of the elastic member fixed to the housing and between the piezoelectric elements.

In the vibration generating apparatus according to an embodiment of the present invention, the elastic bending portion may be provided in a shape of a round shape in the longitudinal direction.

In the vibration generating apparatus according to an embodiment of the present invention, the elastic bending portion may be provided at a full length in the width direction.

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, and 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 may include 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 portion for guiding the weight.

According to another aspect of the present invention, there is provided a vibration generator including: a housing having an inner space; An elastic member mounted on the housing to be disposed in the inner space; And a piezoelectric element mounted on one surface of the elastic member and deforming the elastic member, wherein the elastic member comprises a bottom plate on which the piezoelectric element is mounted on one surface and both ends of which are fixed to the housing, And a supporting plate portion provided at the other end of the connecting portion in the longitudinal direction to guide the weight, wherein when an external force is applied to the bottom plate, And a resilient bent portion provided between both ends of the bottom plate fixed to the housing and serving as a stopper and protruding from a surface opposite to the one surface on which the piezoelectric element is mounted.

By using the present invention, breakage of the elastic member can be prevented by addition of a simple structure.

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 showing an elastic member of the vibration generator according to an 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.

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), and a circuit board (200).

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.

As described above, the upper case 122 may have a box shape. That is, the upper case 122 may include a front plate, a side plate, a back plate, and a top plate.

The front plate and the rear plate may have a plurality of grooves 127 for coupling with the lower case 130.

A vent hole 128 for air flow may be formed on the upper plate.

If the term for direction is defined here, the longitudinal direction means the X direction in FIG. 2, 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-mentioned terms for the respective configurations shall indicate the same direction.

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.

At both ends of the lower case 130, a coupling wall 136 for increasing the coupling force with the upper case 122 may be formed.

On the other hand, a plurality of grooves 138 corresponding to the grooves 127 of the upper case 122 may be formed on both sides of the lower case 130.

3 is a plan view and a perspective view showing an elastic member of a vibration generating device according to an embodiment of the present invention.

Referring to FIG. 3, 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.

An opening (not shown) for electrical connection between the circuit board 200 (see FIG. 1) and the piezoelectric element 160 may be formed on the bottom plate 142.

Both ends of the bottom plate 142 may be provided with a support portion 142e which is supported by the projecting portion 132 of the lower case 122 described above.

The extension plate 144 may have a connection portion 148 connecting the support plate 146 and the bottom plate 142 that contact the front surface and the back surface 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.

At least one support protrusion 146a protruding from the bottom of the support plate 146 to support the weight 180 or the weight cover 170 from below may be provided. The support jaw 146a may restrict the movement of the weight 180 in the height direction. Of course, the weight 180 may be engaged with the support plate 146 by additional bonding such as adhesive bonding, welding, etc. in a state where the weight 180 is engaged with the support step 146a.

On the other hand, the vibration generator may cause excessive deformation of the elastic member 140 provided in the inner space due to an external force such as an external impact. The elasticity of the elastic member 140 may be lowered due to the deformation exceeding the elastic limit of the elastic member 140 or the elastic member 140 may be damaged or deformed by the contact between the elastic member 140 and the housing 120 . Accordingly, the housing 120 may be equipped with a damper or a block that absorbs shocks or acts as a stopper when the elastic member 140 contacts the elastic member 140.

In the vibration generating apparatus 100 according to the embodiment of the present invention, the elastic member 140 may have elasticity that protrudes from the opposite surface of the one surface on which the piezoelectric element 160 is mounted other than the portion where the piezoelectric element 160 is mounted And a bent portion 145 may be provided. That is, the bottom plate 142 may have an elastic bending portion 145 protruding from a side opposite to the side where the piezoelectric element 160 is mounted, in addition to the portion where the piezoelectric element 160 is mounted. In addition, a damper, a block, or the like mounted on the housing 120 may be omitted in order to absorb an impact or serve as a stopper when the elastic member 140 is brought into contact with the elastic member 140.

Here, the elastic bending portion 145 absorbs the shock due to the damping characteristic when an excessive external force is applied, thereby preventing the elastic member 140 from being excessively deformed. The elastic bending portion 145 may be a block or a damper when contacting with the housing 120 before the other portion of the elastic bending portion 145 is subjected to excessive external force.

The elastic bending portion 145 may be provided between both ends of the elastic member 140 fixed to the housing 120 and the piezoelectric element 120.

The elastic bending portion 145 may be rounded in the longitudinal direction, and the elastic bending portion 145 may be formed in the full length in the width direction.

100: Vibration generator
120: Housing
140: elastic member
160: piezoelectric element
180: Weight
200: circuit board

Claims (7)

A housing having an inner space;
An elastic member whose both ends are fixed to the housing so as to be disposed in the inner space so as to be elastically deformable; And
And a piezoelectric element mounted on one surface of the elastic member,
Wherein the elastic member has an elastic bending portion protruding from a surface opposite to a surface on which the piezoelectric element is mounted other than a portion where the piezoelectric element is mounted.
The method according to claim 1,
Wherein the elastic bending portion is provided between both ends of the elastic member fixed to the housing and between the piezoelectric elements.
The method according to claim 1,
Wherein the elastic bending portion is provided in a shape of a round shape in the longitudinal direction.
The method according to claim 1,
Wherein the elastic bending portion is provided at a full length in the width direction.
The method according to claim 1,
Wherein the elastic member comprises a bottom plate mounted on one surface of the piezoelectric element and an extension plate extending in the height direction at both ends in the width direction of the bottom plate.
6. The method of claim 5,
Wherein the extension plate includes a connection part having one end connected to the bottom plate and extending in a height direction at a longitudinal center part of the bottom plate and a support plate part provided at the other end of the connection part in a longitudinal direction to guide the weight, .
A housing having an inner space;
An elastic member mounted on the housing to be disposed in the inner space; And
And a piezoelectric element mounted on one surface of the elastic member to deform the elastic member,
Wherein the elastic member comprises a bottom plate on which the piezoelectric element is mounted on one surface and both ends of which are fixed to the housing, a connecting portion having one end connected to the bottom plate and extending in a height direction at a longitudinally central portion of the bottom plate, And a support plate portion provided in the longitudinal direction and guiding the weight,
The bottom plate is provided with elastic members which are respectively provided between both ends of the bottom plate fixed to the housing and the piezoelectric elements so as to serve as dampers or stoppers when an external external force is applied, And a bent portion.

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