KR20110008533A - One body type magnet and linear type vibration motor have the same - Google Patents

Abstract

PURPOSE: An integrated magnet and a linear vibration motor thereof are provided to maximize electromagnetic force which is applied to a space between a coil and an integrated magnet by forming a yoke to cover the vicinity of the integrated magnet. CONSTITUTION: A substrate(220) is settled on a substrate settling part(214). A coil(230) is combined with a bobbin part(213). A magnet insertion part(251) is combined with both end part of an integrated magnet(240). A weight body(260) is combined with a weight settling part(253). A pair of elastomers(280) are interposed between a base(210) and both end parts of the weight body.

Description

ONE BODY TYPE MAGNET AND LINEAR TYPE VIBRATION MOTOR HAVE THE SAME}

The present invention relates to an integrated magnet and a linear vibration motor having the same.

Vibration motor is a part that converts electrical energy into mechanical vibration by using the principle of electromagnetic force. It is mounted on a mobile phone and used for notification of silent reception. As the mobile phone market is rapidly expanding and various functions are added to mobile phones, miniaturization and high quality of mobile phone parts are required. Therefore, there is a need to develop a new structure of the vibration motor that can improve the shortcomings and improve the quality of the existing products.

Recently, as the introduction of a mobile phone equipped with a large LCD screen has rapidly increased, a touch screen method has been adopted, and a method of generating vibration on the mobile phone body or the screen when the user touches the input unit of the mobile phone is used to improve the user's feeling. Vibration motors are used as a means for generating such vibrations.

In particular, the performance required for the vibration in the touch screen method is required to increase the operating life time of the vibration motor as the number of times of use increases compared to the occurrence of vibration when an incoming call, and the speed of touching the screen to increase the user's satisfaction Fast response speed of vibration motor is required.

Conventional vibration motors use a method of obtaining mechanical vibration by rotating a rotor with an asymmetrical distribution of mass. The current is applied to the rotor coil by the commutation of a brush and a commutator. It utilizes the principle of generating rotational force on the rotor through the feeding method.

Vibration motors using such brushes and commutators cause mechanical friction and electrical sparks when the brush moves between segments of the commutator while the rotor is operating, causing wear or foreign matter such as carbides. There is a problem that the operation life time of the vibration motor is shortened. In addition, when a voltage is applied to the vibration motor, the response speed is slow because the time required for reaching the target vibration amount, that is, the state in which the user can feel the vibration sufficiently, is increased by the rotational inertia.

Linear vibration motors have been developed to solve such short operating life and slow response speed. A linear vibration motor will be described with reference to FIGS. 1 and 2.

1 shows a cross-sectional view of a typical linear vibration motor, and FIG. 2 shows a magnet assembly of the linear vibration motor shown in FIG. 1. This will be described with reference to FIGS. 1 and 2.

Referring to FIG. 1, the linear vibration motor 100 includes a base 110, a coil 130, a magnet assembly 140, a yoke 150, a weight body 160, and an elastic body 180.

A cylindrical coil 130 is installed in the base 110, and a magnet assembly 140 is installed in the coil 130. The yoke 150 is installed at both ends of the magnet assembly 140, and the weight body 160 is connected to the magnet assembly 140 by the yoke 150. An elastic body 180 is interposed between the weight body 160 and the base 110.

Referring to FIG. 2, the magnet assembly 140 includes a core 142, a first magnet 143, and a second magnet 143. The first magnet 143 and the second magnet 144 are coupled to both sides of the core 142 by an adhesive or the like. In this case, polarities of the first magnet 143 and the second magnet 144 are arranged to be symmetrical with respect to the core 142.

Referring back to FIG. 1, when a power is applied to the coil 130, a magnetic field is formed around the coil 130. The magnetic field causes the magnet assembly 140 to move relative to each other. When the magnet assembly 140 moves, the yoke 150 and the weight body 160 coupled thereto move together, and the weight body 160 is moved. When moved, deformation occurs in the elastic body 180.

Here, when the linear vibration motor 100 is vibrated at the resonance frequency by using the elastic modulus of the elastic body 180 and the mass of the weight body 160, the maximum vibration can be obtained. That is, when a direct current or alternating current having a predetermined frequency is applied to the coil 130, the linear vibration motor 100 may be vibrated at a resonance frequency.

However, since the linear vibration motor 100 is frequently operated, the magnet assembly 140 is continuously vibrated. In particular, when a strong shock is applied, such as a mobile phone with a built-in linear vibration motor 100 falls from a high place inadvertently by the user, the impact is also applied to the magnet assembly 140. Due to such frequent vibrations and shocks, the first magnet 143 and the second magnet 144 of the magnet assembly 140 are separated from the core 142, thereby causing a problem that the linear vibration motor 100 is not operated.

The present invention provides an integrated magnet and a linear vibration motor having the same, which have a long service life without being damaged by vibration and shock.

According to an aspect of the present invention, a cylindrical body, a first magnetized portion formed with two magnetic poles in the longitudinal direction on one side of the main body, and the first magnetized portion formed on the other side of the main body and the two magnetic poles relative to the center of the main body There is provided an integrated magnet comprising a second magnetized portion formed symmetrically with the.

Here, the integrated magnet may further include a non-magnetized portion formed in the middle region of the main body and not having magnetic properties.

According to another aspect of the present invention, an integral magnet as described above, a base having a bobbin portion into which the integrated magnet is inserted, a coil coupled to the bobbin portion, a weight body coupled to both ends of the integrated magnet, a base and a weight body There is provided a linear vibration motor having an integrated magnet including a pair of elastic bodies respectively interposed between both ends of the.

Here, the linear vibration motor having an integrated magnet may further include a yoke interposed between the integrated magnet and the weight body and having a shape surrounding the integrated magnet. And, the magnetic fluid may be further included on the surface of the yoke.

According to the embodiment of the present invention, by integrating the magnet, the integrated magnet and the linear vibration motor having the same are not damaged by vibration or shock, and the operation life time is extended.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a side view of the integrated magnet according to an embodiment of the present invention. Referring to FIG. 3, the integrated magnet 240 according to an embodiment of the present invention includes a main body 241, a first magnetized part 243, a second magnetized part 244, and a non-magnetized part 242.

The body 241 is manufactured in a cylindrical shape. In the manufacture of the integrated magnet 240, a material capable of preserving the magnetization state for a long time, for example, tungsten steel, chromium steel, KS magnet steel, MK steel, alumino, quenipe and the like can be used.

One side of the main body 241 is formed with a first magnetized portion 243. The first magnetizing portion 243 is formed along the longitudinal direction of the main body 241. As shown in the drawing, an N pole is formed at one end of the main body 241, and an S pole toward the middle region of the main body 241 is formed. Is formed. These two magnetic poles (magnetize) is formed by the magnetization (magnetize), and the method of magnetization is well known and will not be described.

On the other side of the main body 241, a second magnetized portion 244 is formed. The second magnetizing portion 244 is also formed along the longitudinal direction of the main body 241, as shown in the S pole is formed at the other end of the main body 241, the S pole toward the middle region of the main body 241 Is formed. In this case, the two magnetic poles of the second magnetized portion 244 are formed symmetrically with the first magnetized portion 243 based on the central portion of the body 241. That is, when the N pole is formed at one end of the main body 241 as shown, the N pole is formed at the other end of the main body 241.

As described above, the integrated magnet 240 according to an embodiment of the present invention is formed such that the same magnetic poles face each other. Therefore, the magnetic flux density is formed high around the intermediate region of the main body 241, and the magnetic force lines are formed to be perpendicular to the longitudinal direction of the main body 241. This will be described again below.

In the middle region of the main body 241, a non-magnetized portion 242 having no magnetic properties is formed. The narrower the non-magnetized portion 242 is advantageous because it can increase the magnetic flux density around the middle region of the main body 241.

For reference, the integrated magnet 240 according to an exemplary embodiment of the present invention may have N poles formed at both ends of the main body 241 as shown, and S poles may be formed at both ends of the main body 241, although not shown. It may be formed. That is, the integrated magnet 240 according to an embodiment of the present invention may be formed with a magnetic pole as opposed to the illustrated.

Figure 4 shows an integrated magnet according to a variant of one embodiment of the present invention. Referring to FIG. 4, a magnetic pole is formed in the main body 341 of the integrated magnet 340 so that both sides thereof are symmetrical with respect to the center portion in the longitudinal direction.

That is, N poles are formed at both ends of the main body 341, and S poles are formed in the intermediate region. In this case, the non-magnetizing portion 242 as described with reference to FIG. 3 is not formed in the middle region of the main body 341, and the magnetic pole is continuously formed along the longitudinal direction of the main body 341.

For reference, the integrated magnet 340 according to the modified example of the embodiment of the present invention may have N poles formed at both ends of the main body 341, as shown, but not shown at both ends of the main body 341. A pole may be formed.

The integrated magnets 240 and 340 described with reference to FIGS. 3 and 4 are not easily damaged by vibration and shock. That is, the magnet assembly 140 described with reference to FIG. 2 has an adhesive portion between the core 142, the first magnet 143, and the second magnet 144 when vibration is applied for a long time or a strong impact is applied from the outside. Can be separated.

However, the integrated magnets 240 and 340 according to an embodiment of the present invention are integrally formed without a coupling portion, and thus do not break even when a long time vibration is applied or a strong shock is transmitted from the outside, and thus has a long service life. In particular, when the integral magnets 240 and 340 are made of a material such as tungsten steel or chromium steel, they have a very strong resistance to impact.

5 is an exploded perspective view of a linear vibration motor having an integrated magnet according to an embodiment of the present invention, Figures 6 to 8 of the linear vibration motor having an integrated magnet according to an embodiment of the present invention An exploded perspective view for explaining the structure is shown. It demonstrates with reference to FIG. 5 thru | or FIG.

5 to 8, a linear vibration motor 200 having an integrated magnet according to an embodiment of the present invention includes a base 210, a substrate 220, a coil 230, an integrated magnet 240, The yoke 250, the weight body 260, the cover 270, and the elastic body 280 are included.

The base 210 is provided with a bracket 211 having a through hole 212 formed therein. The bracket 211 is formed with a bobbin (bobbin section: 213) that is connected to the through-hole 212. The substrate seating portion 214 is formed in the base 210, and both sides of the base 210 extend vertically upward.

The substrate 220 is seated on the substrate seating portion 214. At this time, a portion of the substrate 220 is opened, and the bracket 211 and the bobbin portion 213 protrude upward of the substrate 220. One side of the substrate 220 is formed with a protrusion protruding to the outside of the base 210, the terminal 221 is formed on one surface of the protrusion.

The coil 230 is coupled to the bobbin portion 213. The coil 230 has a hollow cylindrical shape, and is coupled in a shape in which the bobbin portion 213 is inserted into the hollow portion of the coil 230. An integrated magnet 240 is inserted into the hollow part connected to the through hole 212 at the center of the bobbin part 213. Here, the integrated magnet 240 is inserted into the bobbin portion 213 to be movable in the longitudinal direction.

At this time, although not shown, the substrate 220 is configured to apply the current supplied to the terminal 221 to the coil 230.

The magnet insertion portion 251 is formed at the center of the yoke 250, and the magnet coupling portion 252 is formed at both sides of the magnet insertion portion 251. On both sides of the yoke 250, the weight seating portion 253 is formed.

The magnet insertion part 251 is coupled to both ends of the integrated magnet 240. In this case, the bracket 211, the bobbin part 213, and the coil 230 are positioned in the magnet insertion part 251. Thus, when the integrated magnet 240 moves relative to the coil 230, the yoke 250 moves with the integrated magnet 240.

The yoke 250 forms a magnetic circuit with respect to the integrated magnet 240, so that the magnetic force lines of the integrated magnet 240 cross the coil 230, that is, the magnetic force lines penetrate the coil 230 in the vertical direction. Allow the amount of to increase. To this end, the yoke 250 has a shape that surrounds the integrated magnet 240. Thus, the electromagnetic force applied between the coil 230 and the integrated magnet 240 is maximized.

The weight body 260 is coupled to the weight seating part 253. Therefore, when the yoke 250 is moved by the integrated magnet 240, the weight body 260 is also moved. The weight body 260 serves to amplify the vibration when the integrated magnet 240 reciprocates in the longitudinal direction by the coil 230. That is, since the vibration of the linear vibration motor 200 increases as the mass of the weight body 260 increases, a material having a high specific gravity is used as a material of the weight body 260.

An elastic body 280 is interposed between a portion extending vertically upwardly on both sides of the base 210 and both sides of the weight body 260. In this case, the direction in which the elastic body 280 is interposed is a direction of both ends of the integrated magnet 240. Accordingly, when the weight body 260 is moved to one side, one of the elastic bodies 280 is compressed and the other is stretched.

The cover 270 is coupled to the upper side of the base 210.

9 is a longitudinal cross-sectional view for explaining the operation of the linear vibration motor having an integrated magnet according to an embodiment of the present invention. Here, FIG. 9 is sectional drawing by the VIII-VIII straight line shown in FIG.

Referring to FIG. 9, for the base 210, the bracket 211, the bobbin portion 213, the substrate 220, and the coil 230, the magnet 240, the yoke 250, and the weight 260 are provided. It is integrated and moves relatively. At this time, the elastic body 280 is compressed or stretched according to the movement of the weight body 260.

When a current is supplied to the terminal 221 of the substrate 220, a magnetic field is formed around the coil 230 while the current flows in the coil 230. Therefore, an electromagnetic force acts between the integrated magnet 240 and the coil 230, so that the integrated magnet 240 is moved relative to the coil 230.

At this time, the integrated magnet 240 is coupled to each other and move together with the integrated yoke 250 and the weight body 260, the weight body 260 is subjected to the elastic force by the elastic body 280 located on both sides. When the current supplied to the coil 230 is adjusted in consideration of the mass of the yoke 250 and the weight body 260 and the elastic modulus of the elastic body 280, the integrated magnet 240, the yoke 250, and the weight body are integrated. Since the 260 can vibrate at the resonance frequency, the vibration of the linear vibration motor 240 can be maximized.

Here, as the integrated magnet 240 moves, noise may be generated while a portion of the yoke 250 is rubbed with the substrate 220 or the base 210. To prevent this, magnetic noise may be applied to the surface of the yoke 250 to minimize such noise.

10 is a partial cross-sectional view for explaining the direction of the line of magnetic force in the linear vibration motor having an integrated magnet according to an embodiment of the present invention. Here, FIG. 10 is sectional drawing by the VIII-VIII straight line shown in FIG.

Referring to FIG. 10, a magnetic force line m formed around a central portion of the integrated magnet 240 is interlinked with the coil 230. The magnetic force line m is formed between the integrated magnet 240 and the yoke 250, where the magnetic force lines formed between both ends of the integrated magnet 240 and the yoke 250 are omitted for convenience.

The electromagnetic force acting between the integrated magnet 240 and the coil 230 becomes stronger as the density of the magnetic force line m interlinked with the coil 230, that is, the magnetic flux density is higher. Accordingly, the integrated magnet 240 increases magnetic flux density that is interlinked with the coil 230 by forming magnetic poles symmetrically formed at both sides toward the central portion.

For reference, the magnetic force lines m formed around the integrated magnet 240 around the center line C are formed symmetrically, and the coil 230 is also symmetrically positioned, but is omitted for convenience.

As described above, the integrated magnet and the linear vibration motor having the same according to an embodiment of the present invention have a long operating life time without being easily broken even if the vibration is applied or the impact is applied from the outside. .

Although the integrated magnet and the linear vibration motor having the same according to an embodiment of the present invention have been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art to understand the spirit of the present invention Within the scope of the same idea, other embodiments may be easily proposed by adding, changing, deleting or adding components, but this will also fall within the scope of the present invention.

1 is a longitudinal sectional view of a general linear vibration motor.

Figure 2 is a side view of the magnet assembly of the linear vibration motor shown in Figure 1;

Figure 3 is a side view of the integrated magnet according to an embodiment of the present invention.

Figure 4 is a side view of the integrated magnet according to a modification of one embodiment of the present invention.

5 is an exploded perspective view of a linear vibration motor having an integrated magnet according to an embodiment of the present invention.

6 to 8 are exploded perspective views for explaining the structure of a linear vibration motor having an integrated magnet according to an embodiment of the present invention.

Figure 9 is a longitudinal cross-sectional view for explaining the operation of the linear vibration motor having an integrated magnet according to an embodiment of the present invention.

10 is a partial cross-sectional view for explaining the direction of the line of magnetic force in the linear vibration motor having an integrated magnet according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

210: base 220: substrate

230: coil 240: integrated magnet

250: yoke 260: weight

270: cover 280: elastic body

Claims (5)

Cylindrical body; A first magnetizer having two magnetic poles formed in one side of the main body along a length direction; And The magnet is formed on the other side of the main body, the two magnetic poles comprising a second magnetized portion formed symmetrically with the first magnetized portion relative to the central portion of the main body. The method of claim 1, And an unmagnetized portion which is formed in an intermediate region of the main body and has no magnetism. The integrated magnet according to claim 1 or 2; A base having a bobbin portion into which the integrated magnet is inserted; A coil coupled to the bobbin portion; A weight body coupled to both ends of the integrated magnet; And A linear vibration motor having an integrated magnet including a pair of elastic bodies respectively interposed between the base and both ends of the weight body. The method of claim 3, And a yoke interposed between the integrated magnet and the weight body, the yoke having a shape surrounding the integrated magnet. The method of claim 4, wherein The linear vibration motor having an integrated magnet, characterized in that it further comprises a magnetic fluid applied to the surface of the yoke.

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