KR20140103878A

KR20140103878A - Vibration apparatus employing can type piezo electric element for mobile terminal

Info

Publication number: KR20140103878A
Application number: KR1020140060199A
Authority: KR
Inventors: 김정훈
Original assignee: 김정훈
Priority date: 2014-05-20
Filing date: 2014-05-20
Publication date: 2014-08-27
Also published as: KR101670897B1

Abstract

The present invention relates to an oscillatory apparatus using can type piezo electric element for mobile terminal, which forms a piezo electric element plate (4) in a body at least on one of either the both sides of a disc type electrode plate (2) and a piezo electric vibrator (8) equipped with elastic-material annular bracket (6) supporting the outer circumference of the disc type electrode plate (2), and then mounting the piezo electric element plate (4) and the piezo electric vibrator (8) in a can type case (14), fixating conical weight (10) in a deep part of the disc type electrode plate (2), which a fixated cavity for securing amplitude (10a) of the weight (10) as a coupling medium is fixated on the face of the disc type electrode plate (2). The apparatus is applicable for the performance of haptic technology, which is capable of controlling the size and speed of vibration sophisticatedly by control per frequency band within the range under the frequency of 300 Hz as well as of operating in vibration with the swift response time equal to or under 2 ms.

Description

TECHNICAL FIELD [0001] The present invention relates to a can type piezoelectric device vibrating device for a mobile terminal,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration device for a mobile terminal, and more particularly to an improvement of a piezoelectric device vibration device for a mobile terminal capable of generating a linear vibration required by a mobile terminal by a piezoelectric effect.

With the development of virtual reality realization technology these days, users are demanding more concrete and realistic information through virtual reality. One of the developments to meet this is haptic technology that transmits tactile feedback to the user by vibration. Simple haptic technology can be classified into various notification functions using vibration means widely used in mobile phones. In addition, haptic technology is widely applied to various fields such as medical simulators and game devices.

In the future, haptic devices as well as monitors and loudspeakers will be installed as output means of computing devices. This is because the tactile recognition rate of the user is high by installing the haptic device in the portable electronic device, and there is an advantage that it is excellent in interoperability with the IT device.

As a concrete and rudimentary example of applying haptic technology to a portable electronic device such as a smart phone, there is a vibration means employed in a mobile terminal, and the sound and image outputted from a conventional mobile terminal are vibrated in a three-dimensional manner.

As an example of vibration means installed in a mobile terminal, Japanese Patent No. 10-793682, "Micro LINE VIBRATION MOTOR (referred to as " Prior Art Document 1 ") is disclosed. In another example, And Korean Patent No. 10-1366213 entitled " Piezoelectric Device Vibrating Device for Mobile Terminals "(referred to as 'Prior Art Document 2').

In the case of the vibration motor disclosed in the prior art document 1, the external appearance is a coin shape having a nail size. The moving stroke distance is short and has a quick vibration response characteristic at the start and stop compared with the conventional eccentric rotation type vibration motor. Or smart phones.

In the case of the vibration device using the piezoelectric element disclosed in the prior art document 2, since it has a thinner body thickness than the coin type vibration motor described in the prior art document 1, there is an advantage that it can meet the slimming trend of the mobile terminal, The characteristics are several tens times faster than the preceding document 1, and it is much more advantageous to realize the simultaneous sense of synchronizing with sound and image.

However, since the piezoelectric vibrating device for a mobile terminal according to the prior art document 2 has a shape of a doubly clamped beam, the thickness of the body is thin, but the length extended to the right and left is much longer than that of the prior art 1, It is practically difficult to employ a conventional mobile terminal adopting a coin type such as the above-mentioned coin type.

Accordingly, an object of the present invention is to provide a mobile terminal capable of vibrating with a quick response time of less than 2 milliseconds [ms] by a piezoelectric element operating method while being narrow as a coin-type linear vibration actuator having a nail- Type piezoelectric element vibrating device.

Another object of the present invention is to provide a can type piezoelectric transducer for a mobile terminal capable of precisely adjusting a magnitude and a velocity of a vibration by adjusting a frequency in a range below a frequency of 300 Hz, And to provide a device vibration device.

A piezoelectric-element vibrating apparatus for a mobile terminal according to the above-mentioned object is characterized in that a piezoelectric-element plate (4) is integrally formed on at least one of both side surfaces of a disk-shaped electrode plate (2) Shaped or polygonal piezoelectric vibrating body 8 provided with an elastic material annular bracket 6 for supporting the outer periphery of the disk-shaped electrode plate 2 so as to be mounted on the can-type case 14, The weight 10 is secured to the disc-shaped electrode plate 2 by means of a connection, and the shaft 10a for securing the amplitude of the weight 10 is fixed.

The piezoelectric element vibrating apparatus 100 of the present invention is characterized in that the weight 10 is connected to the inner surface of the can-type case 14 by an elastic spring 12.

In the piezoelectric vibrating apparatus 100A for a mobile terminal according to another embodiment of the present invention, a piezoelectric element plate 4 is integrally formed on at least one of both side surfaces of a disk-shaped electrode plate 2, Shaped or rectangular polygonal piezoelectric oscillator 8 having an annular elastic bracket 6 for supporting the outer periphery of the disk-shaped electrode plate 2 and mounting the disk-shaped electrode plate 2 on the can type casing 14, The weight 10 is fixed to the disk-shaped electrode plate 2 by means of a connection and fixed to the ceiling portion of the can-type case 14 while the weight 10 is secured to the core portion of the can 10, And the guide shaft rod 30 is slidable relative to the elevation guide groove 26 formed in the center portion of the weight 10.

In the piezoelectric vibrating device 100A, the oil-free metal bearing 28 is mounted in the elevation guide groove 26 of the weight 10. [

In implementing the piezoelectric element vibrating apparatus 100 (100A) according to the embodiment of the present invention, the amplitude of the rotation axis 10a for ensuring the amplitude of the weight 10,

The buffering resin engaging piece 16 is interposed between the center of the bottom of the weight 10 and the other side surface of the disk-shaped electrode plate 2 and bonded with the adhesive 18,

As another example, in the case where the resin coupling piece 16 having the lower end stop 17 is engaged with the hollow of the disk-shaped electrode plate 2, the weight 10 And the adhesive agent 18 is adhered to the center of the bottom of the adhesive layer 18.

In the present invention, the piezoelectric element plate 4 constituting the piezoelectric vibrating body 8 is composed of a unimorph piezoelectric plate attached to one side of the disk-shaped electrode plate 2, A bimorph type piezoelectric plate on which piezoelectric element plates 4 are attached and expanded on both sides of a disk substrate 2 and a piezoelectric element plate 4 on which a plurality of piezoelectric element plate layers are laminated on one side of a disk electrode plate 2 And a shape of a multimorph piezoelectric plate attached and expanded and contracted.

The present invention can be installed as it is in a conventional coin type vibration motor (actuator) position for a mobile terminal with a narrow floor installation area, and can be operated as a vibration actuator of a piezoelectric element operation type, The amplitude and speed of the vibration can be precisely controlled by controlling the frequency band within the frequency range of 300 Hz or less, which makes it easy to apply the Haptic technology.

1 is a perspective exploded view of a can-type piezoelectric element vibrating apparatus for a mobile terminal according to an embodiment of the present invention,
2 is a partial exploded view of a piezoelectric vibrator applied to a can type piezoelectric vibrating device for a mobile terminal according to an embodiment of the present invention.
3 is a cross-sectional front view of a can type piezoelectric device vibrating device for a mobile terminal according to an embodiment of the present invention,
Fig. 4 is an enlarged view of a portion "A" in Fig. 3, and is a cross-sectional view showing in detail the connection state of the center electrode of the weight plate with the disk-
5 is an enlarged view of a modification of the "A" portion of FIG. 3,
6 is an operational conceptual diagram of a can type piezoelectric element vibrating apparatus for a mobile terminal of the present invention,
Fig. 7 is a cross-sectional front view of a can type piezoelectric device vibrating device for a mobile terminal according to another embodiment of the present invention. Fig.
8 is an external configuration diagram of a can type piezoelectric device vibrating apparatus for a mobile terminal of the present invention,
Fig. 9 is a modification of the can-type piezoelectric element vibrating device of Fig. 1,
Fig. 10 is a diagram showing a modification of the disk-shaped electrode plate and the piezoelectric element plate constituting the piezoelectric vibrator of the present invention,
11 is a diagram showing various mounting examples of the piezoelectric element plate constituting the piezoelectric vibrating body according to the present invention,
Fig. 12 is a diagram showing various examples of forming a rotation axis for securing the amplitude of a weight in the present invention. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. As used herein, the term " ring shape or loop " refers to a loop shape, and it should be understood that not only a circular shape but also a square shape such as a square shape is also included.

The can type piezoelectric vibrating device for a mobile terminal according to the present invention has a frequency that generates vibration by using a piezoelectric effect and has a size equivalent to that of an adult thumb or index finger, As in the external view shown in b), it is in the form of a somewhat flattened cylindrical can or a square canned can.

The can type vibration device for a mobile terminal 100 (100A) according to the present invention as shown in FIG. 8 has an advantage that the floor area to be installed occupies as little as the size of the index nail of an adult.

Furthermore, in the present invention, since a linear vibration actuator is implemented, a piezo-actuator operation mode is adopted, so that a quick response time of less than 2 ms can be achieved. Also, the piezoelectric element operating method implemented according to the present invention has a variable value within a wide resonance frequency band ranging from 1 to 300 Hz, and is capable of performing maximum vibration by resonance at an angular frequency band value.

Fig. 1 is an exploded perspective view of a can-type piezoelectric element vibrating apparatus 100 for a mobile terminal according to an embodiment of the present invention, and includes a piezoelectric vibrating body 8 formed so as to be mounted on a cylindrical can- do.

9 shows an exploded perspective view of a can type piezoelectric vibrating device 100 for a mobile terminal according to the present invention, which can also be applied to a square canned can type modified as shown in Fig.

Fig. 2 is a partial exploded view of the piezoelectric vibrating body 8 constituting the can-type piezoelectric vibrating apparatus 100 for a mobile terminal of the present invention shown in Fig. 1, and Fig. 3 shows the piezoelectric vibrating body 8 Sectional view of the can type piezoelectric vibrating device 100 for a mobile terminal according to the present invention.

The piezoelectric vibrating body 8 is composed of a disk-shaped electrode plate 2, a piezoelectric element plate 4, and an elastic material annular bracket 6. That is, the piezoelectric element plate 4 is integrally formed on one side of the disk-shaped electrode plate 2 to constitute a disk diaphragm plate, and an elastic material ring-shaped bracket (not shown) for supporting the outer periphery of the disk- (6).

As shown in Fig. 2, it is preferable that the piezoelectric vibrating body 8, the disk-shaped electrode plate 2, the piezoelectric element plate 4, and the elastic material annular bracket 6 are all formed in a garden shape, But it is to be understood that they may also be configured in the form of regular polygons such as squares as shown. The annular elastic bracket 6 of Fig. 2 is a concentric annular bracket and the resilient annular bracket 6 of Fig. 9 is a square bracket.

Fig. 10 exemplarily shows various forms of the disk-shaped electrode plate 2 and the piezoelectric element plate 4 when the concentric piezoelectric vibrating body 8 is constructed.

10 (a) is a cross-sectional view taken along the line II-II of FIG. 10, and FIG. 10 (B) is a cross- Shaped electrode plate 2 and the piezoelectric element plate 4 have a central hole 3 formed therein. 10 (d) is an example shown in FIG. 9, in which the rectangular disc-shaped electrode plate 2 is integrally attached to the circular piezoelectric element wave 4.

It is obvious to those skilled in the art that the piezoelectric vibrating body 8 can be configured in the form of a modification or a modification in the example shown in Fig. 10 or the example thereof.

The piezoelectric vibrating body 12 including the disk-shaped electrode plate 2 and the piezoelectric element plate 4 of the present invention is connected to the piezoelectric vibrating body 12 through the two electric wires 20, as shown in FIGS. 6 (a) and 6 (b) ) / (+) Or (+) / (-). That is, when different electrodes are attached to the disk-shaped electrode plate 2 and the piezoelectric element plate 4, the positive and negative electric charges in the piezoelectric element plate 4 are aligned in the polarization direction P in a random arrangement.

More specifically, when negative (-) / (+) and positive (+) / negative (-) voltages are alternately applied to the disk-shaped electrode plate 2 and the piezoelectric element plate 4, the annular bracket 6 catches the outer peripheral portion or the outer peripheral portion of the disk-shaped electrode plate 2, so that the upward and downward bending displacement with the deep side as the vertex To generate vibration.

Here, the piezoelectric element plate 4 of the present invention is preferably formed using piezoelectric ceramics (Piezo ceramic) or EAP (Electro Active Polymer). PZT system, PT system, PZT complex system and the like are used in the piezoelectric ceramic. In EAP, polymer complexes such as IPMC (Ionic Polymer Metal Composite), EPAM (Electroactive Polymer Artificial Muscle), MFC (Macro Fiber Composite) It is more preferable to use an actuator or the like.

In the present invention, the piezoelectric element plate 4 is preferably provided as a unimorph piezoelectric plate which is attached to only one side of the disk-shaped electrode plate 2 and extends and contracts in the planar direction as shown in Fig. 11 (a) It is also possible to use a bimorph type piezoelectric plate in which the piezoelectric element plate 4 is attached to both surfaces of the disk-shaped electrode plate 2 as shown in FIG. 11 (b), if necessary. A multimorph piezoelectric plate in which a plurality of piezoelectric element plates are stacked as shown in FIG. 11 (c) may be provided on one side of the disk-shaped electrode plate 2 in order to increase the force.

11 (d) and (e), as shown in Fig. 11 (d) or (e), a hollow piezoelectric plate having a center hole 3 formed in the piezoelectric element plate 4 in a unimoved, bore type) can be used.

The disc-shaped electrode plate 2, which is integrally formed on one side or both sides of the piezoelectric element plate 4 as described above, is made of an alloy metal material, and on the other side of the disc-shaped electrode plate 2, So that the weight 10 is adhesively connected.

In the embodiments of the present invention, the weight 10 uses a tungsten material having a high specific gravity. The weight 10 has a weight of 1 to 5 g when applied to a mobile terminal such as a smart phone, a feature phone, or a tablet PC. If the weight 10 is less than 1 g, the effect of increasing the vibration of the piezoelectric vibrating body 8 becomes weak. If the weight 10 exceeds 5 g, the entire size, thickness and weight of the piezoelectric vibrating body 8 And the response time is prolonged.

In order to smoothly perform the linear vibration of the disk-shaped electrode plate 2 when the disk-shaped electrode plate 2 and the weight 10 are in contact with each other in accordance with the present invention, A jutting island 10a for ensuring amplitude is formed on one side of the weight 10 as in the dotted circle and the other side of the disk electrode plate 2 As shown in FIG.

The linear vibration of the disk-shaped electrode plate 2 may be more advantageous as the contact area with the amplitude-securing rotation shaft 10a becomes narrower. However, when spot contact is made with the weight 10, It is disadvantageous in that when the external impact is applied to the piezoelectric plate 4 attached to the other side of the disk-shaped electrode plate 2, there is a risk of breakage of the piezoelectric plate 4 fixedly attached to the electrode plate 2 do.

Fig. 4 is an enlarged view of a portion "A" in Fig. 3, showing a connection state between the disk-shaped electrode plate 2 according to the present invention and the island-securing seals 10a of the weight 10 in detail.

4, a more detailed description will be given of the shaft 10a for securing the amplitude of the weight 10. In the present invention, the cutting area of the side of the conical root of the weight 10 is made as narrow as possible, ) And to increase impact resistance, a fixing groove having a depth of 0.5 to 1.0 mm is provided on the bottom surface of the conical root portion. Then, the resin connecting piece 16 having a thickness of 0.55-1.1 mm is inserted into the fixing groove and the resin connecting piece 16 is brought into contact with the other side of the disk electrode plate 2, and silicon or urethane resin is contained Thereby forming an amplitude securing seals 10a.

Fig. 5 shows another example of forming the amplitude control shaft 10a of the weight 10 having conical roots according to the present invention.

In the example of Fig. 5, the resin bonding piece 16 is in the shape of a single rod having the lower end stop 17. The resin bonding piece 16 is sandwiched between the piezoelectric element plate 4 and the disk-shaped electrode plate 2 using the hollow of the disk-shaped electrode plate 2 so as to be jammed in the fastening tape 17, The adhesive 18 is adhered.

In the present invention, in forming the shaft 10 for securing the amplitude of the weight 10, it may be formed using the conical root portion of the weight 10 like a top, but in other forms as shown in various examples of Fig. 12 Can be implemented.

12 (b), the length of the shaft 10 for securing the amplitude at the center of the lower portion of the weight 10 is set to be the same as that of the conical root weight 10 ) So that the linear vibration amplitude w can be ensured. The linear vibration amplitude w may be secured by forming a stepped layer at the conical root side of the weight 10 as shown in Fig. 12 (c) .

1 to 3, each electric wire 20 provided for applying a voltage of a different polarity to the disk-shaped electrode plate 2 of the piezoelectric vibrating body 8 and the piezoelectric element plate 4 is shown in FIG. 2 It is preferable to provide a flexible cable in which a conductive print pattern is formed. The wire entry opening of the can-type case 2 through which the electric wire 20 made of a flexible cable passes is finished with an ultraviolet curing adhesive to protect the interior part of the case 2 from the external environment.

The annular bracket 1 according to the present invention, in which the outer periphery of the disk-shaped electrode plate 2 integrally formed with the piezoelectric element plates 4 is fitted in a fitting groove line (6a in Fig. 2) The elastic member 6 is a closed loop type elastic member having a ring-like shape with one side cut out as shown in FIG. 2 and a cutting groove formed at the lower end.

9 has a rectangular annular bracket 6 and a square disc type electrode plate 2 having a rectangular annular bracket 6 integrally formed with the rectangular piezoelectric element plate 4 Is fitted in the fitting groove of the inner wall surface to permit linear vibration in the vertical direction. The rectangular bracket 6 shown in FIG. 9 can be formed in a closed loop shape having a cut-out groove at the lower end of the ring, or a one-side cut loop shape.

The elastic material annular bracket 6 not only provides a working space in which the disk-shaped electrode plate 2 integrally attached with the piezoelectric element plate 4 can perform accurate vertical vibration motion, but also the disk-shaped electrode plate 2 ) To allow the maximum vibration power to be exerted for each variable frequency band within the frequency range of 1 to 300 Hz.

The disc-shaped electrode plate 2 in which the piezoelectric element plates 4 are integrated should be free to reciprocate up and down in spite of the outer peripheral portion and the outer peripheral portion being supported. If the outer periphery or the outer periphery of the disk-shaped electrode plate 2 integrated with the piezoelectric element plate 4 is fixed by welding or bonding, the resonance frequency band is fixed, and if the resonance frequency band is slightly out of range The power is suddenly reduced.

The important function of the haptic technique to be embodied in the present invention is to realize the maximum vibration force for each variable frequency band within the frequency range of 1 to 300 Hz, Like electrode plate 2 sandwiched by the disk-like electrode plates 2 and 6a is allowed to allow fine horizontal flow of the disk-shaped electrode plate 2 for up-and-down vibration, It does.

In the present invention, the annular elastic bracket 6 is formed of a resin material or a rubber material, which is an elastic material, to have a hardness value of 20 to 80 in terms of Shore hardness. It has a hardness value of 20 to 80 on the Shore A hardness scale and a hardness value of 30 to 70 on the Shore D hardness scale.

The lower the shore hardness value of the elastic material annular bracket 6 has the advantage that the noise due to the vibration is reduced, but the desired vibration transmission characteristic is also lowered in the vibration device of the present invention. Therefore, the inventors of the present invention have confirmed the critical range in which vibration transmission characteristics are improved while reducing vibration noise through a number of experiments, and the shore hardness value of the elastic material annular bracket 6 is set to 20 to 80 as described above.

In the meantime, the present invention is a can type piezoelectric vibrating device for a mobile terminal which can easily implement an elliptic technology. In order for the device to operate properly, the following items 1) to 3) should be sufficiently taken into consideration or eliminated.

1) The vibration device of the present invention must have sufficient durability against an external impact such as drop impact.

2) Noise generated in the vibration device of the present invention should be prevented or minimized.

3) The reciprocating motion of the linear vibration of the piezoelectric vibrating body 8 must be correct.

First, in relation to the above item (1), if an external impact such as a falling impact is applied, the weight 10 of high weight is removed from the disk-shaped electrode plate 2 or the fragile The piezoelectric element plate 4 can be damaged.

The vibration device of the present invention has two types of measures for ensuring sufficient durability against an external impact.

As a first measure, the gap between the head surface of the weight 10 and the inner surface of the can-type case 14 is set between the elastic springs 12 (see Fig. 1 and Fig. 3) ).

The upper and lower surface contact portions are respectively brought into contact with the inner chamber ceiling portion of the corresponding case 14 and the head surface of the weight 10 and the laser spring 12 is welded or spot welded The connection is fixed. When the elastic spring 12 is maximally elongated at the lowest linear motion strength of the piezoelectric vibrating body 8 and is maximally compressed at the linear movement best point of the piezoelectric vibrating body 8, It does not interfere. In addition, even if there is a strong impact from the outside, the elastic spring 12 elastically holds the weight 10 which is weighed, so that various internal components including the piezoelectric element plate 4 are safely protected.

In addition to the elastic springs 12, the shock absorbing sponge 32 is concentrically mounted on the disk-shaped electrode plate 2, so that the built-in parts can be safely protected from falling or external impact. The shock absorbing sponge 32 does not interfere with the up / down operation of the weight 10 even when the conical root of the weight 10 comes into contact with the sponge 32 due to its nature.

Next, regarding the above 2), it is necessary to prevent or minimize the noise generated in the vibration device of the present invention.

Since the vibration of the piezoelectric vibrating body 8 is a wave, a sound wave using air as a medium is naturally generated. The sound waves generated together with the vibration operation of the piezoelectric vibrating body 8 become noises.

In the case of adopting the elastic spring 12 as in the embodiment of the vibration device 100 shown in Figs. 1 and 3 for preventing or minimizing the noise, the spring 12 can prevent or minimize noise even . Further, the elastic material annular bracket 6 constituting the piezoelectric vibrating body 8 also reduces the noise generated during the linear vibration of the disk-shaped electrode plate 2 to some extent.

In order to further improve the noise prevention, it is possible to add a soundproof sheet (24 in Fig. 7) to the inner surface of the case bottom plate 14a of the case 14 and the inner wall surface of the case 14 together.

Finally, regarding the above item 3), the reciprocating motion of the linear vibration of the piezoelectric vibrating body 8 must be accurate.

The reciprocating motion of the linear vibration of the present invention is performed by the interlocking operation of the piezoelectric vibrating body 8 composed of the disk-shaped electrode plate 2, the piezoelectric element plate 4 and the elastic material annular bracket 6, The reciprocating motion of the linear vibration of the piezoelectric vibrating body 8 is accurately performed.

That is, the inventive piezoelectric vibrating body 8 having the structure in which the disk-shaped electrode plate 2 having the piezoelectric element plate 4 integrally connected to the cone-shaped weight 10 having a high specific weight has a linear reciprocating speed of 1 to 300 times per second The outer periphery of the disk-shaped electrode plate 2 is elastically supported on the elastic material annular bracket 6 constituting the piezoelectric vibrating body 8 so as to secure the accuracy of the reciprocating motion in which the linear vibration is performed, The vibration force is maximized for each frequency band within a frequency range below the frequency, so that the magnitude and speed of the vibration can be finely controlled.

In Fig. 7, a piezoelectric vibrating apparatus 100A according to another embodiment of the present invention for achieving perfect vertical linear vibration is shown.

7, the piezoelectric vibrating apparatus 100A according to another embodiment of the present invention includes the configuration of the piezoelectric vibrating apparatus 100 shown in Fig. 3, and a guide shaft (not shown) fixed to the ceiling of the can- 30 are provided so as to be able to slide relative to the elevating guide groove 26 formed in the center of the head portion of the weight 10. [

The guide shaft rod 30 is engaged and fixed by laser welding or spot welding and the elevation guide groove 26 is formed at the center of the head portion of the weight 10, And an oil-free metal bearing 28 is mounted on the elevating guide groove 26 by forced insertion. The guide shaft rod 30 fixed to the ceiling portion of the can type casing 14 is slidably fitted in the bushing type oilless metal bearing 28 inserted and fixed in the elevation guide groove 26 of the weight 10, Accurate upward and downward movement of the weight 10 can be achieved.

If necessary, the soundproof and buffering resin reinforcement 22 may be mounted in the can-type case 14 so as to allow the weight 10 to move up and down, The weight 10 is prevented from being absorbed or relieved by colliding with the inner wall surface first, and the internal noise is not emitted outside.

The can type piezoelectric vibrating device 100 (100A) for a mobile terminal according to the embodiments of the present invention is a piezoelectric vibrating device in which a vibrating operation with a quick response time of 2 ms or less due to the adoption of a piezoelectric element type as a linear vibration actuator, It is possible to precisely control the magnitude and speed of the vibration by adjusting the frequency band within the range, and it is also possible to install the vibration absorber as it is at the installation position of the conventional can type vibration motor (actuator) for a mobile terminal with a small footprint.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of claims and equivalents thereof.

The present invention can be applied to a haptic device in which various interfaces with a user such as a mobile communication device, a medical device, and various office devices are performed.

(2) a disk-shaped electrode plate (4) a piezoelectric element plate
(6) - Elastic material Round bracket (6a) - Fitting groove
(8) - Piezoelectric vibrating body (10) - Weight
(10a) - Revolving seals for securing amplitude (12) - Elastic spring
(14) - can type case (14a) - case bottom plate
(16) - resin bonding piece (18) - silicone adhesive
(20) - Wire (22) - Resin filling resin for buffer
(24) - Soundproofing sheet for cushioning (26) - Lift guide groove
(28) - Oilless metal bearings (30) - Guide shaft
(100) (100A) - a can type piezoelectric element vibrating device for a mobile terminal

Claims

In a piezoelectric vibrating device for a mobile terminal,
The present invention is not limited thereto and may be applied to a garden type or the like having an elastic material annular bracket 6 integrally formed on at least one of both side surfaces of the disk electrode plate 2 and integrally formed with the piezoelectric element plate 4 and supporting the outer periphery of the disk electrode plate 2 Shaped piezoelectric vibrator 8 to be mounted on the can type case 14 while the weight 10 is fixed to the core of the disk-shaped electrode plate 2, Shaped electrode plate (2) by a connecting medium. 2. The can type piezoelectric device vibrating apparatus for a mobile terminal according to claim 1,

2. The can type piezoelectric vibrating device for a mobile terminal according to claim 1, wherein an elastic spring (12) is connected between the head surface of the weight (10) and the inner surface of the can type case (14).

The can type case (14) according to claim 1 or 2, characterized in that a soundproof and buffering resin reinforcement (22) is mounted in the can type case (14) so that the weight (10) Can type piezoelectric device vibration device.

The can type piezoelectric element vibrating apparatus for a mobile terminal according to claim 1 or 2, characterized in that a cushioning sound insulating sheet (24) is attached to an inner surface side of the can case (14) on the mounting space side.

In a piezoelectric vibrating device for a mobile terminal,
The present invention is not limited thereto and may be applied to a garden type or the like having an elastic material annular bracket 6 integrally formed on at least one of both side surfaces of the disk electrode plate 2 and integrally formed with the piezoelectric element plate 4 and supporting the outer periphery of the disk electrode plate 2 Shaped electrode plate 2 so that the weight 10 is fixed to the center of the disk-shaped electrode plate 2 while the weight of the weight 10 for securing the amplitude of the weight 10a Shaped electrode plate 2, and the surface of the disk-
Wherein the guide shaft rod (30) fixed to the ceiling portion of the can type case (14) is made to be able to slide relative to the elevation guide groove (26) formed in the core portion of the weight (10) Device vibration device.

The can type piezoelectric vibrating apparatus for a mobile terminal according to claim 5, wherein an oil-free metal bearing (28) is mounted on the elevation guide groove (26) of the weight (10).

The piezoelectric vibrating element (4) according to any one of claims 1 to 5, wherein the piezoelectric element plate (4) constituting the piezoelectric vibrating body (8) A bimorph type piezoelectric plate which is stretched and contracted by attaching the piezoelectric element plate 4 to both surfaces of the disk electrode plate 2 and a piezoelectric substrate 1 having a plurality of piezoelectric element plate layers laminated on one side of the disk electrode plate 2, Type piezoelectric device vibrating device for a mobile terminal, wherein the piezoelectric device is formed in one of the forms of a multimorph piezoelectric plate to which the device plate (4) is attached and expands and contracts.

6. The method according to any one of claims 1 to 5, characterized in that the amplitude-securing rotation shaft (10a) of the weight (10) is provided between the center of the bottom of the weight (10) and the other side of the disk- Is interposed and bonded by an adhesive (18). &Lt; Desc / Clms Page number 19 >

6. A method of manufacturing a disk-like electrode plate (2) according to any one of claims 1 to 5, characterized in that the amplitude-securing rotation shaft (10a) of the weight (10) Wherein the weight (10) is bonded to the center of the bottom of the weight (10) with an adhesive (18).

6. The can type piezoelectric vibrating apparatus for a mobile terminal according to any one of claims 1 to 5, wherein the weight (10) is formed in a shape of a conical root, a square rectangle, and a shape in which a plurality of steps are formed in a conical root.

8. The piezoelectric element according to claim 7, wherein the unimog, bimorph, and multimorph piezoelectric rolling elements (8) further include a center hole (3) in the disk-shaped electrode plate (2) and the piezoelectric element plate Type piezoelectric vibrating device for a mobile terminal.

The can type piezoelectric vibrating device for a mobile terminal according to claim 1 or 5, wherein the elastic material annular bracket (6) is formed of one of a rubber material and a resin material.

The can type piezoelectric vibrating apparatus according to claim 1 or 5, wherein the disk-shaped electrode plate (2) is made of an alloy metal and the weight (10) is made of a tungsten material.

6. The piezoelectric vibrating body (8) according to any one of claims 1 to 5, characterized in that a maximum vibration force is exerted by resonance for each frequency band varying within a frequency range of 1 to 300 Hz. Device vibration device.

6. The mobile terminal according to claim 1 or 5, further comprising a shock absorbing sponge (32) attached concentrically on the disk-shaped electrode plate (2) having the weight (10) Type piezoelectric vibrating device.