KR101362392B1 - Linear vibration generating device - Google Patents

Abstract

Disclosed is a linear vibration generating device employed in a portable terminal. The disclosed linear vibration generating device includes a stator including a coil forming a magnetic field; And a vibrator including a permanent magnet coaxially opposed to the stator, wherein the vibrator includes a yoke for mounting the permanent magnet and an elastic member extending integrally with the yoke to support the vibrator.

Portable, terminating device, linear vibration, motor, coin type, yoke, elastic.

Description

Linear Vibration Generator {LINEAR VIBRATION GENERATING DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear vibration generating device, and more particularly, to a coin type linear vibration generating device which is employed in a portable terminal including a DMB phone, a smart phone, a cellular phone, and the like, and is used as a silent receiving device.

In general, an eccentric rotation type vibration generator has been generally used as a vibration generating device employed in a mobile terminal as an incoming device. However, with the trend of slimming of the mobile terminal, the rotation distance of the moving body is short and eccentric rotation type vibration is present. Compared to the generator, a linear vibration generator having fast vibration characteristics at start and stop is employed in a portable terminal.

Such a linear vibration generating device is generally composed of a vibrator including a permanent magnet and a stator supporting the vibrator, and the interaction between the electromagnetic force generated by applying a current to a coil disposed on the stator and the magnetic force generated in the permanent magnet. In operation, the permanent magnet moves up and down to generate vibration.

The conventional linear vibration generating device is provided with a stator having a coil in the case, a vibrator having a permanent magnet, and a yoke is provided to fix the permanent magnet, and elastically supporting the yoke to which the permanent magnet is fixed. Elastic members have been provided to generate vibrations.

However, the conventional linear vibration generator has a structure in which the yoke and the elastic member are separately manufactured and mounted, thereby increasing the number of assembly operations and providing a factor of manufacturing cost increase. The yoke should be provided with a permanent magnet, and the yoke to which the permanent magnet was fixed was arranged coaxially with the coil by the elastic member to provide vertical vibration.

An object of the present invention is to provide a linear vibration generating device that reduces the manufacturing cost by reducing the number of assembly operations according to the reduction of the number of parts.

It is also an object of the present invention to provide a linear vibration generating device that extends the life of the product by arranging the collision prevention means in the right place.

In order to solve the above technical problem, the present invention provides a linear vibration generating device comprising: a stator including a coil to form a magnetic field; And a vibrator including a permanent magnet coaxially opposed to the stator, wherein the vibrator is formed integrally with the yoke for mounting the permanent magnet and the yoke, and extends from the yoke to support the vibrator. And the elastic member is disposed under the yoke to receive the coil, and the yoke includes an opening at which an upper end is opened to accommodate the permanent magnet.

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As described above, the linear vibration generating device according to the present invention has been achieved by the yoke and the elastic member are integrally manufactured and arranged, thereby reducing the manufacturing cost by simplifying the assembly process according to the reduction of the number of parts, The advantage of prolonging the life of the product has been achieved by preventing or minimizing the collision between the permanent magnet and the component in a place where it may collide with the permanent magnet.

Referring to Figure 1 will be described the configuration of a linear vibration generating device 10 according to an embodiment of the present invention.

As shown in FIG. 1, the linear vibration generating device 10 according to an embodiment of the present invention is a small size that is employed at a predetermined position of a mobile terminal including a cellular phone or a smart phone and used as one of a silent receiving device. Is a vibration generating motor of a slim coin type.

The linear vibration generating device 10 includes a stator 100, a vibrator 200 vibrating linearly in the stator 100, and the vibrator 200 includes the yoke 210 and the yoke 210. It includes an elastic member 220 manufactured in one piece. Specifically, the disclosed linear vibration generating device 10 includes a stator 100 including a coil 130 forming a magnetic field, and a vibrator 200 including a permanent magnet M facing coaxially with the stator 100. In particular, the vibrator 200 according to the present invention extends integrally with the yoke 210 and the yoke 210 to mount the permanent magnet (M) to the permanent magnet (M) to the coil ( 130) an elastic member 220 supporting the upper portion.

The stator 100 and the vibrator 200 are relative to each other, and the stator 100 means a portion fixed to the vibrator 200, and the vibrator 200 vibrates with respect to the stator 100. It means part. The stator 100 is mounted on the bracket 120, the case 110 coupled to the bracket 120, and the bracket 120, and is accommodated in the case 110 to provide an electromagnetic force when a current is applied. It includes a cylindrical coil 130 to. The case 110 mentioned as a housing function is responsible for protecting the elements contained therein from the external environment, and is configured in a coin shape.

In addition, the vibrator 200 includes a permanent magnet (M) mounted on the yoke 210 and the weight body 250 coupled to the outside of the yoke 210. The weight body 250 is a hollow element is inserted into the outer peripheral surface of the yoke 210, provides a predetermined mass to the vibrator for linear vibration, and the influence of the magnetic force of the permanent magnet (M) It is made of nonmagnetic material.

In the linear vibration principle according to the above configuration, when a current is applied to the coil 130, the permanent magnet M is formed by the interaction between the electromagnetic force generated in the coil 130 and the magnetic properties of the permanent magnet M. Induces vertical vibration of). At this time, the permanent magnet (M) may be located in the cylindrical coil 130, or may be located outside. Such linear vibration principles will be readily understood by those skilled in the art.

Linear vibration generating device 10 that operates on this principle is composed of the yoke 210 and the elastic member 220 in one piece, specifically in a one-piece form, it may be formed in one piece molded. The elastic member 220 is positioned below the yoke 210 and disposed at the lower end thereof in contact with the bracket 120. The elastic member 220 has a connecting portion 220a integrally formed with the yoke 210, and is formed in a spiral shape integrally with the connecting portion 220a and extends downwardly, and has elastic force in a direction away from each other. At least one elastic deployment unit (220b), and a fixed portion (220c) configured to be integral with the elastic deployment unit (220b) for supporting the yoke (210) having the permanent magnet in the inner diameter. The elastic development part 220b is composed of a plurality, particularly preferably symmetrical configuration. That is, the elastic development part 220b is preferably formed in two or more.

The yoke 210 has a substantially hollow cylindrical shape in which a part of an upper end is opened and a lower part is completely opened. As will be described later, the permanent magnet M has an inner diameter by an upper plate 230 where the upper part is partially opened. The upper end of the coil 130 is disposed in the open space of the lower end of the coil 210a.

A specific configuration of the yoke 210 includes an opening 210a having a predetermined inner diameter at which an upper end thereof is opened to accommodate an upper end of the permanent magnet M, and a fixing part 210b extending radially from the opening 210a. And a hollow vertical development part 210c extending vertically downward from the fixing part 210b, and a connection part 210d integrally formed with the elastic member 220 at an end of the vertical development part 210c. The connection portion 210d and the elastic member 220 provide a shape having a predetermined angle. The yoke 210 guides the up and down linear vibration while substantially accommodating the permanent magnet M according to the above configuration.

The linear vibration generating device 10 according to the present invention includes means for preventing a collision occurring when the vibrator vibrates at a predetermined position, hereinafter, a collision with a permanent magnet provided at a loading location of the linear vibration generating device. The configuration of the prevention means will be described.

The permanent magnet M is fixed to the opening 210a by an upper plate 230, and a lower plate 240 is provided on a bottom surface thereof. The upper plate 230 is fixed in contact with the upper surface of the permanent magnet (M), and is fixed in parallel while contacting the upper surface of the fixing portion (210b) of the yoke, when the linear vibration of the permanent magnet (M), In order to prevent a collision with the ceiling surface of the case 110, an upper movable vertical collision preventing means 310 is further provided on the upper surface of the upper plate 230. The upper movable vertical collision preventing means 310 includes a magnetic fluid focused in response to the magnetic flux of the permanent magnet M, and in particular, provides a ring-shaped magnetic fluid strip. Alternatively, the upper movable vertical collision preventing means 310 may be configured to be spaced apart by applying a plurality of spots on the upper plate 230. The upper and lower plates 230 and 240 mounted on the upper and lower surfaces of the permanent magnet M may be formed of magnetic materials.

The magnetic fluid mentioned above is a substance that focuses on the magnetic flux of the permanent magnet (M), and stabilizes and disperses the magnetic powder in a colloidal shape in a liquid, and then adds a surfactant to prevent precipitation or aggregation of magnetic powder by gravity or magnetic field. Means a substance, and has the property of attracting magnetic.

The upper movable vertical collision preventing means 310 minimizes the touch sound between the permanent magnet M and the ceiling surface of the case 110 during operation.

The lower plate 240 is mounted on the bottom surface of the permanent magnet M. The lower plate 240 has a circular inner diameter and an outer shape having a circular, polygonal or oval shape. The polygon refers to a triangle, a square, and the like. Preferably, the lower plate 240 is provided with a hollow region having an inner diameter, and the lower movable vertical collision preventing means 330 is further provided in the hollow region. The lower movable vertical collision preventing means 330 prevents the collision with the bracket 120 during vertical vibration of the permanent magnet M. The lower movable vertical collision avoidance means 330 may be made of a magnetic fluid, or may be made of silicon or tape or oil of a cross-sectional adhesive. The lower movable vertical collision preventing means 330 is formed to be in contact with the bottom surface of the permanent magnet M to prevent the collision with the bracket 120 in advance. Therefore, the touch sound between the permanent magnet M and the bracket 120 is minimized during linear vibration motor operation. In addition, if the lower plate 240 is not provided with the collision preventing means 330 in the hollow inner region, it can be replaced with a material having elasticity may be responsible for the collision prevention function. The elastic material mentioned may be a one-sided adhesive sponge or a component such as silicone.

In addition, the left and right collision preventing means 320 is further provided between the yoke 210, the elastic member 220, and the coil 130. The left and right collision preventing means 320 is formed to contact the inner surface of the yoke 210 and the elastic member 220. The left and right collision preventing means 320 is applied to the coil 130 to prevent the collision with the upper outer surface of the coil 130 when the permanent magnet (M) is a vertical vibration movement. The left and right collision preventing means 320 includes a magnetic fluid, and in particular, has a magnetic fluid band shape and is specifically formed in a ring shape to surround the coil 130, specifically, the upper side of the coil. Alternatively, the left and right collision preventing means 320 may be configured to be spaced apart in a plurality of spot coating shape.

In addition, a fixed collision preventing means 340 is further provided on the bottom surface of the bracket 120 on which the coil 130 is disposed. The fixed collision preventing means 340 is disc-shaped and disposed in the coil 130 to face the permanent magnet M or to the lower movable vertical collision preventing means 330. The fixed anti-collision means 340 may be made of an elastic silicone or foamed polymer material, for example, a sponge or the like, and may be formed of a single-sided silicone or foamed polymer sectional tape.

2 is a cross-sectional view showing another embodiment of the linear vibration generating device 40 according to the present invention. In the description of FIG. 2, descriptions overlapping with the embodiments of the present disclosure disclosed in FIG. 1 will be omitted. The linear vibration generating device 40 further includes an upper collision preventing means 430 on the ceiling surface inside the case 110. The upper collision preventing means 340 may be made of a polymer material of silicone or foam component having elasticity. For example, it may be made of a material such as a sponge. The upper anti-collision means is attached to the ceiling surface by an adhesive. That is, the upper collision preventing means 430 may be composed of a polymer cross-section tape of the silicone or foam component of the cross-sectional attachment type.

When the current is applied to the coil according to the above configuration, the permanent magnet (M) performs a vertical vibration movement coaxially with the coil, to prevent or minimize the collision with the ceiling surface of the case 110 in advance.

1 is a cross-sectional view showing a linear vibration generating device according to an embodiment of the present invention.

2 is a cross-sectional view showing a linear vibration generating device according to another embodiment of the present invention.

Claims (20)

In the linear vibration generator, A stator comprising a coil forming a magnetic field; And A vibrator comprising a permanent magnet coaxially opposite the stator, The vibrator A yoke for mounting the permanent magnet and an yoke mounted integrally with the yoke and extending from the yoke to support the vibrator, The elastic member is disposed below the yoke to receive the coil, The yoke is linear vibration generating device characterized in that it comprises an opening in which the upper end is opened to accommodate the permanent magnet. delete The method of claim 1, wherein the elastic member A connection unit integrated with the yoke; At least two elastic deployment parts which are formed in a spiral shape integrally with the connection part and expand in a downward direction and are provided with an elastic force in a direction away from each other; And And a fixed part configured to be integral with the elastic deployment part to support the yoke. delete The method of claim 1 wherein the yoke A fixed portion extending radially from the opening; A cylindrical vertical deployment portion extending vertically downward from the fixing portion; And And a connecting portion integral with the elastic member at the end of the vertical deployment portion. [6] The linear vibration generating device of claim 5, wherein the permanent magnet is further provided with an upper plate and a lower plate on the upper and lower surfaces, respectively, and are mounted to the opening by the upper plate. The linear vibration generating device of claim 6, wherein the upper and lower plates are made of a magnetic material. The linear vibration generating device according to claim 6, wherein the lower plate has a circular inner diameter and an outer shape is circular, polygonal or elliptical. The linear vibration generating device according to claim 6, further comprising an upward movable vertical collision preventing means on the upper plate upper surface. 10. The linear vibration generating device according to claim 9, wherein the upwardly movable vertical collision preventing means includes a magnetic fluid, and the magnetic fluid is composed of a plurality of spaced dot coating or ring-shaped magnetic fluid bands. 7. The linear vibration generating device according to claim 6, further comprising a lower movable vertical collision preventing means in a hollow region in contact with the lower plate inner diameter. The linear vibration generating device according to claim 1, further comprising left and right collision preventing means between the yoke and the elastic member. The linear vibration generating device according to claim 12, wherein the left and right collision preventing means is formed between the yoke, the elastic member, and the coil to contact an inner surface between the yoke and the elastic member. 13. The linear vibration generating device according to claim 12, wherein the left and right collision preventing means includes a magnetic fluid, and the magnetic fluid is composed of a plurality of spaced dot coating or ring-shaped magnetic fluid bands. The linear vibration generating device as set forth in claim 1, further comprising a fixed surface anti-collision means attached to the bottom of the stator on which the coil is disposed. 16. The linear vibration generating device according to claim 15, wherein the fixed collision preventing means is made of a single-sided silicone or foamed polymer or a single-sided tape. delete The method of claim 1, wherein the stator A case accommodating the vibrator; And It includes a bracket coupled to the case, The vibrator Linear vibration generating device comprising a weight body coupled to the outside of the yoke. The linear vibration generating device of claim 6, wherein the lower plate is made of an elastic material and serves as an anti-collision function. 19. The linear vibration generating device as set forth in claim 18, further comprising an upper collision prevention means on the case ceiling surface facing the permanent magnet.

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