KR101650162B1 - Linear vibration generating device - Google Patents

Abstract

A linear vibration generator employed in a portable terminal is disclosed. The disclosed linear vibration generating apparatus includes a base, an outer case, a coil, and a stator including a center yoke; A vibrator including a magnet and a weight; And an elastic body mounted on the stator and supporting the vibrator, wherein the weight has a stepped portion on an inner diameter surface, the magnet is tightly fixed in a state of being accommodated, and the outer diameter of the lower plate is smaller than the outer diameter of the magnet.

Description

[0001] LINEAR VIBRATION GENERATING DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a portable terminal, and more particularly, to a linear vibration generator used in a mobile terminal as a silent receiving apparatus.

2. Description of the Related Art Generally, a linear vibration generator used as a silent receiving device of a portable terminal has a short stroke of a moving part and has a quick vibration characteristic at the time of starting and stopping as compared with a conventional eccentric rotation type vibration motor due to elasticity of an elastic body.

Generally, such a linear vibration generating apparatus is composed of a vibrator including a magnet and a stator for supporting the vibrator. The electromagnetic force generated by applying a current to the coil and the magnetic force generated by the magnet cause the vibrator to move up and down And the vibration is generated.

The configuration of a conventional linear vibration generator 10 will be described with reference to Fig. 1, a conventional linear vibration generating apparatus 10 is composed of a vibrator and a stator, and the vibrator includes a central yoke 14, a magnet 15 and a weight 16, The stator includes an outer case (12), a base (11), and a coil (13).

In the linear vibration generator 10, the center yoke 14 is fixed to the base 11 by press-fitting or insertion. The base (11) is provided with a hollow fixing part (110) in which a lower portion of the center yoke (14) is press-fitted into the center of the vibration axis.

The center yoke 14 is made of a material having a magnetic function such as a metal material and is fixed to the base 11 while protecting the upper end of the coil 13. The center yoke 14 is concentric with the coil 15, As shown in Fig. The center yoke 14 is pressed onto the base 11 to form a magnetic circuit together with the magnet 15. The center yoke 14 includes a cylindrical body 141, a cylindrical upper portion 142, a cylindrical lower portion 143, a cylindrical upper portion 144, and a cylindrical upper pole 145. The center yoke 14 protrudes upward from the center of the cylindrical upper portion 142 and has a cylindrical upper end portion 18a which contributes to holding the concentricity between the coil 13 and the central yoke 14 144 and an upper pole 145. In addition, the outer case 12 has a concentric opening 120 on the upper surface of which the upper pole 145 is engaged. That is, the cylindrical upper end portion 144 and the concentric opening 120 contribute to the concentricity of the center yoke 14, thereby preventing the possibility of concentric failure.

The outer case 12 is a member having a coin-shaped outer shape of the linear vibration generating device 10 together with the base 11, and is formed in a simple covering shape and can be made of magnetic or non-magnetic. As described above, a circular concentric opening 120 is provided at the center of the upper surface of the outer case 12.

The magnet 15 is formed in a ring shape so as to surround the outer periphery of the coil 13 coaxially with the coil 13 and the central yoke 14. [ The magnet 15 has an upper plate 180 and a lower plate 182 on the upper and lower surfaces, respectively. The upper plate 180 is ring-shaped and is fixed to the upper surface of the magnet 15. The lower plate 182 is a metal ring and is disposed between the lower surface of the magnet 15 and the upper end of the elastic body 17 and fixedly attached to the lower surface of the magnet 15. The upper and lower plates 180 and 182 may be made of a metal material or may be made of a material that acts as a magnetic body, thereby contributing to the prevention of external magnetic field leakage and the construction of a magnetic circuit. That is, since the upper and lower plates 180 and 182 are made of a magnetic material, the magnetic circuit generated by the central yoke 14 and the magnet 15 is concentrated toward the center of the coil 13.

In addition, the vibrator further includes a heavy weight 16 in the outer circumferential direction of the magnet 15. The weight body 16 is formed in a ring shape and is provided in such a shape that the magnet 15 is wrapped around the inner diameter portion and a part of the inner diameter portion is wrapped by the upper plate 180 and the lower plate 182. In particular, the inner diameter surface of the weight 16 is arranged to be in contact with the outer diameter surface of the magnet 15. The outer surface of the magnet 15 may be made of a non-magnetic material so that the magnetic circuit of the linear vibration generator 10 concentrates toward the center.

The elastic body 17 is disposed between the base 11 and the magnet 15 so as to surround the outer periphery of the coil 13. The elastic body 17 always maintains a state of being in intimate contact with the lower plate 182, and the lower end always maintains a state of close contact with the base 11 at all times.

Hereinafter, a configuration for preventing collision between components occurring in the linear vibration generator 10 will be described.

The linear vibration generator 10 includes a plurality of collision preventing portions. A first vertical impact prevention part 31 is provided between the weight 16 and the upper plate 180. The first vertical impact prevention part 31 is provided by applying a magnetic fluid. The magnetic fluid may be provided by spot coating or ring coating. The first vertical impact prevention part 31 minimizes an impact between the vibrator and the outer case 12. [ Also, a second vertical impact prevention part 32 is provided on the base 11. The second vertical impact preventing portion 32 may be formed of any one of rubber, foamed resin such as silicone or sponge. The second vertical impact prevention part 32 minimizes an impact between the elastic body 17 and the base 11. In addition, a third vertical impact prevention part 33 is provided between the outer surface of the lower plate 182 and the bottom surface of the weight 16. The third vertical impact preventing portion 33 is provided by applying a magnetic fluid. The magnetic fluid may be provided by spot coating or ring coating. In operation of the linear vibration generator 10, the impact between the lower plate 182 and the base 11 is minimized. Further, a horizontal collision preventing portion 34 is further provided between the magnet 15 and the cylindrical upper portion 142 of the central yoke 14. The horizontal collision preventing portion 34 may be formed of a magnetic fluid. The magnetic fluid may be provided by spot coating or ring coating. The horizontal collision preventing portion 34 is provided between the upper inner circumferential surface of the magnet and the outer circumferential surface of the cylindrical upper portion 142. In operation of the linear vibration generator 10, the horizontal collision preventing portion 34 minimizes an impact between the cylindrical portion 142 and the magnet 15.

However, the conventional linear vibration generator 10 as described above has the following problems.

There is a problem that a contact phenomenon occurs between the protruding upper plate 180 and the outer case 12 at the time of moving the maximum stroke distance of the vibrator during operation of the conventional linear vibration generating device 10, have.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a linear vibration generating apparatus that minimizes noise generated by contact between a protruding upper plate and an outer case when the vibrator is moved for a maximum stroke distance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a linear vibration generator comprising a base, an outer case, a coil, and a central yoke; A vibrator including a magnet and a weight; And an elastic body mounted on the stator and supporting the vibrator, wherein the weight has a stepped portion on an inner diameter surface, and the magnet is closely fixed to the stator, and the outer diameter of the lower plate is equal to or smaller than the outer diameter of the magnet.

In addition, the weight according to the present invention is constituted by the ring-shaped upper and lower portions and the stepped portion disposed between the upper and lower portions, wherein the inner diameter of the lower portion is larger than the inner diameter of the upper portion.

Further, the outer circumferential surface of the magnet according to the present invention is closely fixed to the lower inner circumferential surface, and the outer circumferential region of the upper surface of the magnet is closely fixed to the outer circumferential region of the upper bottom surface.

In addition, a first vertical collision preventing portion is provided concentrically with the center yoke on the front surface of the outer diameter case of the present invention, and faces the upper surface of the magnet directly.

The first vertical impact preventing part according to the present invention is constituted by any one of rubber, silicone, and foamed resin sponge. The first vertical impact preventing part has a disc shape or a ring shape. The outer diameter is smaller than the inner diameter of the weight / Is smaller than the inner diameter of the magnet.

The second vertical impact prevention unit may be formed of any one of rubber, silicone, and foamed resin sponge, and may be disk-shaped or ring-shaped, Is larger than the outer diameter.

Further, the upper part of the weight body according to the present invention further comprises a first collision preventing part on the upper surface, and the first collision preventing part is composed of either a magnetic fluid or a grease.

Further, a second collision preventing portion may be further provided between the magnet according to the present invention and the upper portion of the central yoke, and the second collision preventing portion may be formed of any one of a magnetic fluid and a grease.

Further, a third anti-collision portion is further provided between the lower portion of the weight and the outer surface of the lower plate according to the present invention, and the third anti-collision portion surrounds the outermost peripheral region of the magnet.

Further, a stopper is tightly fixed in a concentric manner between the outer case and the central yoke according to the present invention.

Further, the stopper according to the present invention is cylindrical and is formed of a foam rubber of a hard material. The upper surface is closely fixed to the front surface of the outer case and the bottom surface is closely fixed to the upper surface of the central yoke.

The outer diameter of the stopper according to the present invention is smaller than the inner diameter of the magnet.

In addition, the stopper according to the present invention is closely fixed to the outer case in a state of being inserted into the first vertical impact preventing portion.

Further, the center yoke according to the present invention includes: a cylindrical body portion disposed in the coil; A cylindrical top portion extending in an outer circumferential direction on the body portion and having an upper surface in tight contact with the bottom surface of the stopper; And has a diameter smaller than that of the body, and protrudes downward from the body in the center, and is inserted into the bracket.

Further, a linear vibration generating apparatus according to the present invention includes: a stator; A magnet, and a vibrator including a lower plate, wherein an outer diameter of the lower plate is equal to or smaller than an outer diameter of the magnet.

Further, a linear vibration generating apparatus according to the present invention includes: a stator; A vibrator comprising a magnet and a weight provided on the magnet; And an elastic body mounted on the stator and supporting the vibrator, wherein the weight includes an upper portion having an inner diameter; And a lower portion having an inner diameter smaller than that of the upper inner diameter, an upper plate is mounted in a receiving space surrounded by the upper inner diameter, and an open space surrounded by the inner diameter of the upper portion of the weight is provided on the upper plate do.

Further, a lower plate is mounted between the magnet and the elastic body according to the present invention, and the outer diameter of the lower plate is equal to or smaller than the outer diameter of the magnet.

The outer diameter of the upper plate according to the present invention is larger than the outer diameter of the magnet.

As described above, the linear vibration generator according to the present invention can prevent the generation of noise due to the contact between the upper plate and the outer case, thereby contributing to the improvement of the reliability of the product.

1 is a cross-sectional view showing a configuration of a linear vibration generator according to a conventional example.
2 is a cross-sectional view showing a configuration of a linear vibration generator according to a first embodiment of the present invention.
3 is a cross-sectional view showing a configuration of a linear vibration generator according to a second embodiment of the present invention.
4 is a cross-sectional view showing a configuration of a linear vibration generator according to a third embodiment of the present invention.
5 is a sectional view showing a configuration of a linear vibration generator according to a fourth embodiment of the present invention.
6 is an enlarged view of the main part of Fig.

Hereinafter, various linear vibration generators according to the present invention will be described with reference to the drawings. Like reference numerals refer to like elements. The linear vibration generator according to the first to fourth embodiments of the present invention will now be described with reference to FIGS. 2 to 6. FIG. In describing the present invention, the stator generally refers to components that do not vibrate among important components of a linear vibration generator, and the vibrator refers to components that vibrate among important components of a linear vibration generator.

The configuration of the linear vibration generator 20 according to the first embodiment of the present invention will be described in detail with reference to FIG. As shown in Fig. 2, the linear vibration generating device 20 provides a solution to the noise problem generated between the vibrator and the stator during vibrational motion, as compared with the conventional linear vibration generating device 10. Fig. The linear vibration generator 20 is constituted by a vibrator, a stator and an elastic body 27, and an elastic body 27 provided between the stator and the vibrator supports the vibrator. The stator and the vibrator are relative to each other, the stator means a portion fixed to the vibrator, and the vibrator means a portion vibrating with respect to the stator.

The linear vibration generator 20 has a coin-shaped outer appearance by a combination of an outer case and a base. The inside of the linear vibration generator 20 has a center yoke 24, a coil 23, (25), and the weight (26). The linear vibration generating device 20 includes a central yoke 24 which is arranged to protect the coil 23 and has a weight 26, a magnet 25, a lower plate 30, (27).

The vibrator includes a magnet 25 and a weight 26. The stator includes an outer case 22, a base 21, a coil 23, and a central yoke 24. The magnet 25 has a shape to surround and protect the outer periphery of the coil 23, and the weight 26 is provided to the magnet 25. The coil 23 is fixed to the base 21 and the center yoke 24 is fixedly inserted or fixedly inserted into the base 21 so as to be fixed to the inner space of the coil 23 in a concentric manner. do. The linear vibration generating device 20 may be constructed such that the center yoke 24 is press-fitted or inserted into the base 21 and the center yoke 24 is press-fitted, inserted or welded to the outer case 22 Lt; / RTI >

The base 21 is provided with a fixing portion 210 to which the lower portion 242 of the center yoke 24 is inserted or press-fitted into the center of the vibration axis. The fixing portion 210 is hollow. The fixing portion 210 protrudes upward from the base 21 at a predetermined height. In addition, the fixing portion 210 has an inner diameter surface and an outer diameter surface. The protruding height of the fixing portion 210 may be sufficiently increased so as to be fixed by inserting / pressing the center yoke 24.

The center yoke 24 is made of a material that functions as a magnetic body such as a metal material and has a shape that protects the coil 23 (the upper end of the coil is protected by a cylindrical upper portion as described below) Is fixed to the case (22) and has a shape favorable for concentricity with the magnet (25) and the coil (23). The center yoke 24 is inserted on the base 21 to form a magnetic circuit together with the magnet 25. The center yoke 24 is disposed so as to extend in the direction of the vibration axis, which is vertically upwardly formed on the base 21, The center yoke 24 includes a cylindrical body portion 240, a cylindrical upper portion 241, and a cylindrical lower portion 242. The cylindrical body 240 and the cylindrical upper portion 241 and the cylindrical lower portion 242 are integrally formed. The cylindrical portion 241 is inserted and disposed in the inner space of the coil 23. The cylindrical upper portion 241 extends horizontally in the circumferential direction on the cylindrical body 240 and is disposed on the coil 23. This structure allows the upper end of the coil 23 to be moved from the magnet 25 Protect. The cylindrical lower portion 242 is smaller in diameter than the cylindrical body 240 and protrudes downward in the center of the cylindrical body 240 and inserted into the fixed portion 210. The coil 23 is inserted and fixed to the outside of the fixing part 210 and the center yoke 24 is formed in a cylindrical shape And the lower portion 242 is inserted into the fixing portion 210 while being inserted into the coil 23. Further, in order to prevent insulation failure due to damage of the coil 23 when the cylindrical body is press-fitted into the coil 23, an adhesive is further applied to increase an effect of increasing the coupling force with the coil 23 .

The center yoke 24 protrudes upward in the center of the cylindrical upper portion 241 and has a cylindrical upper end portion 241 which contributes to holding the concentricity between the coil 23 and the center yoke 24 243 and an upper pawl 244. In addition, the outer case 22 has a concentric opening 220 on the upper surface of which the upper pole 244 is engaged. That is, the upper pole 244 and the concentric opening 220 contribute to maintaining the concentricity of the center yoke 24, thereby preventing the possibility of concentric failure.

The cylindrical upper portion 241 substantially extends from the base 21 to the magnet 25 and in particular the cylindrical yoke 24 has a cylindrical upper portion 241 which is substantially coaxial with the upper surface of the permanent magnet 25 And are arranged in the same plane state. The inner diameter surface of the coil 23 and the outer diameter surface of the cylindrical body 240 may face each other face-to-face or may be disposed in contact with each other. Also, the inner diameter of the magnet 25 and the outer diameter of the cylindrical portion 241 may be uniformly spaced to provide a gap, or the cylindrical portion 241 may be closely fixed to the upper portion of the coil by an adhesive.

The outer case 22 is a member having a coin-shaped outer shape of the linear vibration generating device 20 together with the base 21, and is formed in a simple covering shape, and can be configured to be magnetic or non-magnetic. As described above, the circular concentric opening 220 is provided at the center of the upper surface of the outer case 22.

The magnet 25 is formed in a ring shape and has an upper surface and a lower surface, an outer diameter surface, and an inner diameter surface. The magnet 25 is disposed so as to surround the outer periphery of the coil 23 coaxially with the coil 23 and the central yoke 24. [

The magnet 25 has a lower plate 30 on a lower surface thereof. The lower plate 30 is formed of a metallic ring and is disposed between the bottom surface of the magnet 25 and the upper end of the elastic body 27 and tightly fixed to the lower surface of the magnet 25. The lower plate 30 may be made of a metal material, or may be made of a material that acts as a magnetic body, thereby preventing external magnetic field leakage and contributing to the construction of a magnetic circuit. That is, since the lower plate 30 is made of a magnetic material, the magnetic circuit generated by the center yoke 24 and the magnet 25 is concentrated toward the center of the coil 23.

Preferably, the lower plate 30 is configured to have a smaller radial size than the conventional one. In other words, the lower plate 30 is configured such that its inner diameter is approximately the same as the inner diameter of the magnet 25, and its outer diameter is smaller than the outer diameter of the magnet 25. That is, the lower plate 30 is configured to have a significantly smaller outer diameter than the conventional lower plate 182 (shown in FIG. 1). Accordingly, the contact area of the lower plate 30 with the upper end of the elastic body 27 is reduced, so that noise is minimized during the vibration operation. The upper surface of the lower plate 30 is in close contact with the bottom surface of the magnet 25 and the bottom surface is in close contact with the upper end of the elastic body 27. The lower plate 30 is effective in reducing noise when the contact area with the upper end of the elastic body 27 is minimized.

The vibrator further includes a high specific gravity (26) in the outer circumferential direction of the magnet (25). The weight 26 is generally ring-shaped and includes an upper portion 260, a lower portion 262, and a step 264. The upper portion 260, the lower portion 262, and the step portion 264 are integrally formed, and the weight 26 is divided for explanatory convenience. The upper portion 260 has an outer diameter surface and an inner diameter surface. The lower portion 262 has an outer diameter surface and an inner diameter surface. The stepped portion 264 is disposed between the bottom surface of the upper portion 260 and the inner surface of the lower portion 262. The upper portion 260 is ring-shaped, and the outer surface faces the outer case 22. The lower portion 262 has a substantially ring shape, an outer diameter surface thereof faces the outer case 22, and an inner diameter surface is closely fixed to the outer circumferential surface of the magnet 25.

The inner diameter of the lower portion 262 is larger than the inner diameter of the upper portion 260 so that the step portion 264 is formed between the upper portion 260 and the lower portion 262, . That is, the stepped portion 264 is located between the bottom surface of the upper portion 260 and the inner surface of the lower portion 262, and a part (outer peripheral portion) of the magnet is closely fixed to the stepped portion 264. When the magnet 25 is fixed to the step portion 264, the upper portion of the magnet 25 is protected by the upper portion 260 and the outer surface of the magnet 25 is tightly fixed to the inner surface of the lower portion 262 Loses. The coupling structure of the weight 26 and the magnet 25 is a coupling structure capable of minimizing disengagement of the portable device when falling. In addition, the linear vibration generator 20 according to the present invention eliminates the upper plate component, contributing to cost reduction.

In addition, the weight 26 is configured to completely accommodate the magnet 25 in the inner space. In particular, the outer surface of the magnet 25 may be formed of a non-magnetic material so that the magnetic circuit of the linear vibration generator 20 concentrates toward the center.

The elastic body 27 is disposed between the base 21 and the magnet 25 so as to surround the outer periphery of the coil 23. [ The elastic body 27 is a leaf spring having a shape gradually increasing in diameter toward the lower end than the upper end so that the upper end of the elastic body 27 is kept in a state of being closely fixed to the lower plate 30, The lower end keeps always in close contact with the base 21 at all times. In addition, the elastic body 27 is fixed through means such as welding.

The linear vibration generating device 20 provides the oscillating force of the oscillator together with the coil 23 by the magnetic circuit provided by the magnet 25 and the central yoke 24. [ Reference numeral 'FPCB' denotes a flexible circuit electrically connected to the coil 23, and the flexible circuit FPCB is drawn out of the outer case 22 and electrically connected to an unillustrated external power supply.

Hereinafter, an anti-collision structure for preventing collision between components occurring in the linear vibration generator 20 will be described with reference to FIG.

As shown in FIG. 2, the linear vibration generator 20 includes a plurality of vertical collision preventing portions. The first vertical impact preventing portion 28 is provided on the front surface of the outer case 22. The first vertical impact preventing portion 28 may be formed in a disk shape (configurable when the upper and lower pole portions of the central yoke are removed, that is, applicable to the central yoke shown in FIG. 4) And a foamed resin such as a sponge. The first vertical impact preventing portion 28 minimizes the impact between the vibrator, specifically, the magnet 25 and the outer case 22, thereby minimizing the noise caused by the contact between the magnet 25 and the outer case 22.

Preferably, the first vertical impact preventing portion 28 has an outer diameter (outer diameter) and an inner diameter (inner diameter). The outer diameter is smaller than the inner diameter of the weight portion 260, . The first vertical impact preventing portion 28 has such a size of the inside and outside, and is a highly effective arrangement for preventing noise. In other words, when the linear vibration generator 20 is operated, the first vertical impact preventing portion 28 does not contact the weight 26, and the collision with the outer edge of the upper surface of the magnet 25 Absorbable structure.

In addition, the second vertical impact prevention part 29 is provided on the base 21. The second vertical impact preventing portion 29 is ring-shaped, and may be formed of any one of rubber, foamed resin such as silicone or sponge. The second vertical impact preventing portion 29 minimizes the impact between the elastic body 27 and the base 21.

Referring to FIG. 2, the arrangement structure of the center yoke 24, the magnet 25, the weight 26 and the first vertical impact prevention part 28 will be described below. The upper surface of the cylindrical upper portion 241 is located on the same plane as the lower surface of the weight portion 260 or the upper surface of the magnet 25. The inner diameter surface of the magnet 25 faces the outer diameter surface of the cylindrical portion 241 and the outer diameter surface of the upper end of the coil 23. The vertical thickness of the first vertical impact preventing part 28 may be slightly larger than the thickness of the weight portion 260 to effectively block noise generated when the magnet 25 collides with the magnet 25.

Referring to Fig. 3, the configuration of the linear vibration generator 300 according to the second embodiment of the present invention will be described. Since the detailed description of the linear vibration generator 300 according to the second embodiment of the present invention has been described in the linear vibration generator 20, only the differences between the configurations will be described. The difference is that the configuration of the collision avoidance unit is different, and only the configuration of the collision avoidance unit will be described below, and the description of the remaining configuration has already been described, and thus will be omitted.

As shown in FIG. 3, the linear vibration generator 300 according to the second embodiment of the present invention includes a plurality of collision preventing parts to prevent collision between important components. The plurality of collision preventing portions 310, 320, and 330 apply magnetic fluid or grease to a portion where contact occurs between important components and minimize collision at the time of vibration. This is very effective for noise reduction.

The weight (26) is provided with a first collision preventing portion (310). In detail, the first collision preventing portion 310 is provided on the upper surface of the weight body 260. The first anti-collision portion 310 is applied on the upper surface of the weight portion 260 in a plurality of gap-spreading or ring shapes to minimize collision between the top surface of the outer case 22 and the weight 26 . The approximate radius of the first anti-collision portion 310 is preferably greater than the inner diameter of the weight portion 260. In other words, it is effective to prevent collision by having a diameter larger than the outer diameter of the first vertical impact preventing portion.

In addition, a second collision preventing portion 320 is provided between the magnet 25 and the center yoke 24. The second collision preventing portion 320 may be formed of a magnetic fluid or a grease material. The second collision preventing portion 320 is positioned between an edge area on the upper end of the inner diameter portion of the magnet and an outer diameter surface of the cylindrical upper portion 241 of the central yoke 24. [ In operation of the linear vibration generating device 300, the second collision preventing portion 320 minimizes collision between the cylindrical portion 241 and the magnet 25, thereby contributing to noise reduction. The impact mainly refers to a collision occurring in the horizontal direction. The second collision preventing portion 320 may be applied in a plurality of spaced-apart dot coating or ring-like shapes. However, the second collision preventing portion 320 may be selectively applied between the magnet 25 and the cylindrical upper portion 241 of the central yoke.

An edge region 250 (the outermost peripheral region where the magnet bottom and outer circumferential surface meet) of the magnet 25 between the lower portion 262 of the weight 26 and the outer peripheral surface of the lower plate 30 is provided with a third collision preventing (330) is further provided. The third collision preventing portion 330 may be formed of a magnetic fluid or a grease material. The third collision preventing portion 330 is provided in a shape that blinks the lower edge region of the magnet. In operation of the linear vibration generator 300, the third collision preventing part 330 minimizes an impact between the magnet 25 and the elastic body 27. The impact mainly refers to a collision occurring in the vertical direction. The third collision preventing portion 330 may be applied in a plurality of spaced-apart dot coating or ring-like shapes.

Referring to Fig. 4, the configuration of the linear vibration generator 400 according to the third embodiment of the present invention will be described. The detailed description of the linear vibration generator 400 according to the third embodiment of the present invention is omitted because it has been described in the linear vibration generator 20, and only the differences between the configurations will be described.

4, in the linear vibration generator 400 according to the fourth embodiment of the present invention, a stopper 50 is mounted between the center yoke 44 and the outer case 42. The center yoke 44 has an upper end 243 (shown in Fig. 2) and an upper pole 244 (shown in Fig. 2), as compared to the center yoke 24 configured in the linear vibration generator 20. [ Is the deleted structure. That is, the center yoke 44 is roughly an alphabetical letter 'T' and includes a body portion 442, an upper portion 441, and a lower portion 443. The upper portion 441, the trunk portion 442, and the lower portion 443 are integrally formed, and will be described separately for convenience of explanation. The body 442 extends downward in the diameter of the upper portion 441 and the lower portion 443 extends in the body 442 to have a smaller diameter. The body portion 442, the upper portion 441, and the lower portion 443 each have an inner and outer diameters and are each formed into a cylindrical shape. The upper surface 441 has a flat upper surface. The stopper (50) is disposed between the upper portion (441) and the front surface of the outer case (42).

The stopper 50 has a cylindrical shape and is concentrically mounted between the central yoke upper portion 441 and the front surface of the outer case 42. The upper surface of the stopper 50 is closely fixed to the front surface of the outer case 42, And is tightly fixed to the upper surface of the upper portion 441 concentrically. Preferably, the stopper 50 is made of a hard rubber material and a foam rubber material. The stopper 50 is tightly mounted between the central yoke portion 441 and the outer case 42 to prevent the outer case 42 from being deformed by an external force. It also prevents the deviation of the center yoke 44, and particularly contributes to noise reduction due to deformation of important components during operation of the linear vibration generator 400. [

The outer diameter of the stopper 50 is preferably equal to or smaller than the outer diameter of the central yoke upper portion 441. The stopper 50 is preferably smaller than the magnet 25. Preferably, the stopper 50 is inserted into the inner opening of the first vertical impact preventing portion 28. Also, the stopper 50 is preferably a foam rubber of a hard material.

Particularly, the stopper 50 serves not only to support the center yoke 44 but also to prevent magnetic leakage when the linear vibration generator 400 operates. This is because the stopper 50 is mounted in close contact between the center yoke 44 and the outer case 42 so as to elastically support the outer case 42 and the center yoke 44, It is possible because it is.

The linear vibration generator 400 includes the collision preventing portions 52 and 54 as shown in FIG. Reference numeral 52 denotes a second collision avoiding portion provided on the magnet 25 and the central yoke upper portion 441. Reference numeral 54 denotes a third collision preventing portion provided on the outer periphery of the lower plate 30 Collision prevention part. The second anti-collision portion 52 is selectively applied, and the third anti-collision portion 54 is essentially applied.

The configuration of the linear vibration generator 60 according to the fourth embodiment of the present invention will be described with reference to Figs. 5 and 6. Fig. The description of the overlapped components is omitted, and only the differences are described in comparison with the linear vibration generator 20 shown in FIG. 2 in the linear vibration generator 60 according to the fourth embodiment of the present invention.

As shown in FIGS. 5 and 6, the linear vibration generator 60 according to the fourth embodiment of the present invention is an apparatus for attenuating noise, and seeks for noise reduction with a vibrator supported by a stator. The linear vibration generator 60 includes a magnet 65, a weight 66, and upper and lower plates 70 and 72. The linear vibration generator 60 includes a weight 66 in the outer circumferential direction about the magnet 65, an upper plate 70 on the upper surface, and a lower plate 72 on the lower surface.

The weight (66) employed in the linear vibration generator (60) is provided in the magnet (65) and operates as a vibrator. For convenience of explanation, the weight 66 is divided into an upper portion 660 and a lower portion 662. The upper portion 660 and the lower portion 662 are each ring-shaped, each having an inner diameter and an outer diameter. The outer diameter of the upper portion 660 and the lower portion 662 are the same, but the inner diameter of the upper portion 660 is larger than the inner diameter of the lower portion 662.

Thus, there is an accommodation space surrounded by the inner diameter of the upper portion 660 between the inner diameter of the upper portion 660 and the lower portion 662. The upper plate 70 is mounted in the accommodating space, and the upper plate 70 is configured to be thinner than the upper and lower thicknesses of the upper plate 660 in order to reduce noise. Therefore, the upper plate 70 has an open space 664 as much as the upper and lower thicknesses of the upper portion 660 and the upper plate thickness, and the open space 664 has a gap Minimizing impulse, contributing to vibration noise attenuation.

The upper plate 70 is ring-shaped and has an outer diameter that is in contact with the inner diameter surface of the upper portion 660 and is larger than the outer diameter of the magnet 65. The inner diameter of the upper plate (70) is approximately the same as the inner diameter of the magnet (65).

Further, a lower plate 72 is mounted between the magnet 65 and the elastic body. The lower plate 72 is ring-shaped and has an inner diameter and an outer diameter. The outer diameter of the lower plate 72 is approximately the same as or smaller than the outer diameter of the magnet 65, and the inner diameter is approximately the same as the inner diameter of the magnet 65. The lower plate 72 is preferably configured to have an outer diameter equal to or smaller than the outer diameter of the magnet 65 in order to minimize a region in contact with the upper end of the elastic body.

The linear vibration generator 60 includes the collision preventing portions 80 and 82 as shown in FIG. Reference numeral 80 denotes a second collision preventing portion provided on the magnet 65 and the central yoke, and 82 denotes a third collision preventing portion provided on the outer circumferential surface of the lower plate 72. The second collision preventing portion 80 is selectively applied, and the third collision preventing portion 82 is essentially applied.

According to the above configuration, there is an open space on the upper plate, and the collision with the outer case constituting the stator is minimized compared with the conventional case, which is effective for attenuating noise.

Linear vibration generator: 20 Elastomer: 27
Center yoke: 24 coils: 23
Magnet: 25 Weight: 26
Lower plate: 30 Outer case: 22
Base: 21 Corps: 210

Claims (15)

In a linear vibration generator,
A stator comprising: a base; a central yoke fixed to the base; a coil positioned around the central yoke; and an outer case coupled to the base to mount the central yoke and the coil;
A vibrator including a magnet surrounding the outer periphery of the upper portion of the coil and a weight provided in the magnet;
And a stopper which is positioned facing the upper surface of the central yoke and the ceiling surface of the outer case,
Wherein the weight body is provided with a step portion in which an upper surface and a side surface of the magnet face each other,
The first vertical impact preventing portion is provided on the front surface of the outer case case concentrically with the center yoke, and the first vertical impact preventing portion faces the upper surface of the magnet. The first vertical impact preventing portion is in close contact with the ceiling surface of the outer case, A fixed linear vibration generator.
The linear vibration generator as set forth in claim 1, wherein the weight is composed of ring-shaped upper and lower portions and a stepped portion disposed between the upper and lower portions, wherein an inner diameter of the lower portion is larger than an inner diameter of the upper portion.
3. The linear vibration generator as set forth in claim 2, wherein the outer circumferential surface of the magnet is closely fixed to the lower inner circumferential surface, and the outer circumferential region of the upper surface of the magnet is closely fixed to the outer circumferential region of the ring- delete [2] The apparatus according to claim 1, wherein the first vertical impact prevention portion is formed of one of rubber, silicone, and foamed resin sponge, and is of a disc or ring type, having an outer diameter smaller than both the inner diameter of the weight and the outer diameter of the magnet, Wherein the inner diameter is smaller than the inner diameter of the magnet.
[2] The apparatus of claim 1, further comprising a second vertical impact prevention unit on the base, wherein the second vertical impact prevention unit is formed of any one of rubber, silicone, and foamed resin sponge, A linear vibration generating device configured to be larger than the outer diameter of the magnet.
The linear vibration generator according to claim 2, wherein the upper part of the weight further comprises a first collision preventing part on the upper surface, and the first collision preventing part is composed of any one of a magnetic fluid and a grease.
The linear vibration generator according to claim 1, wherein the second collision preventing portion provided between the magnet and the upper portion of the central yoke is formed of any one of a magnetic fluid and a grease.
The linear vibration generator according to claim 2, further comprising a third collision preventing portion between the lower portion of the weight and the outer surface of the lower plate of the magnet, and the third collision preventing portion includes a linear vibration generating device .
The linear vibration generator according to claim 1, wherein a stopper is closely fixed to the outer case and the central yoke in a concentric manner.
11. The linear vibration generator as set forth in claim 10, wherein the stopper is cylindrical and is formed of a foam rubber of a hard material, the upper surface is closely fixed to the front surface of the outer case and the bottom surface is closely fixed to the upper surface of the central yoke.
12. The linear vibration generator according to claim 11, wherein the stopper outer diameter is smaller than the inner diameter of the magnet.
11. The linear vibration generator as set forth in claim 10, wherein the stopper is tightly fixed to the outer case in a state of being inserted into the first vertical impact prevention portion.
14. The method of claim 13, wherein the center yoke
A cylindrical body disposed in the coil;
A cylindrical top portion extending in an outer circumferential direction on the body portion and having an upper surface in tight contact with the bottom surface of the stopper; And
And a cylindrical lower portion having a diameter smaller than that of the body portion and projecting downward from the body portion toward the center.
The linear vibration generator according to claim 1, wherein the vibrator further comprises a lower plate provided in the magnet.

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