KR20100088290A - Vibration motor - Google Patents

Abstract

PURPOSE: A vertically movable vibrating motor is provided to reduce the deviation of the scale of the elastic member which supports the heavy body by arranging a plurality of elastic members centered on the heavy body in order to balance out the heavy body. CONSTITUTION: A housing(320) is installed on the top of a base(310). The heavy body is arranged between the base and the housing. The magnet is fixed to either of the heavy body or the base. The coil is fixed to either of the heavy body or the base to one elated by having no magnet. The coil is arranged to be contiguous to the magnet. The elastic member is installed on base or the housing. The elastic member elastically supports the heavy body up and down in vertical direction.

Description

Shanghai Vibration Motor {VIBRATION MOTOR}

The present invention relates to a Shanghai-type vibration motor, and more particularly, to a Shanghai-type vibration motor in which a weight moves in a vertical direction by the interaction of a magnet and a coil to generate vibration.

In general, ringtones and vibrations are widely used for incoming calls in communication devices. For vibration, it is common to drive a small vibration motor so that the driving force is transmitted to the case of the device so that the whole device can vibrate.

Vibration motor, which is one of the receiving means that is currently applied to communication devices such as mobile phones, is a component that converts electrical energy into mechanical vibration by using the principle of electromagnetic force, and is mounted on a mobile phone and used for silent incoming notification.

However, with the rapid expansion of the mobile phone market and the addition of various functions to mobile phones, vibration motors also improve the shortcomings of existing products and dramatically improve the quality in the situation where miniaturization and high quality of mobile phone parts are required. There is a need to develop a new structure to improve the product.

1 and 2 are cross-sectional views of a conventional general Shanghai dynamic vibration motor.

As shown in FIGS. 1 and 2, the conventional vibration motor includes a base 110, a vibration part 120 disposed on the base and moving up and down, and a magnet fixed to the vibration part 120. 140 and the coil 130 mounted and fixed to the base 110 to move the vibrator 120 up and down by the interaction of the electromagnetic force generated when the power is applied and the magnetic force generated by the magnet 140, An elastic member 160 having a lower end in contact with an upper surface of the vibrator 120 and coupled to the base 110 in contact with an upper portion of the elastic member 160 and an elastic member 160 for adding an elastic force to the vibrator 120. It consists of a cover 170.

In addition, as shown in FIG. 2, the elastic member 160 of the related art is integrally formed with a plurality of elastic parts 161 that are bent upward and downward.

However, when a plurality of the elastic members 161 are integrally formed as in the conventional elastic member 160, the shapes are complicated to process, and the dimensions of the plurality of the elastic members 161 to match the frequency characteristics during assembly. There is a difficulty to manage the same.

In particular, when changing the shape of a particular part that is intensively stressed during repeated vibrations, there is a problem in that the manufacturing cost increases because the number of elastic parts 161 must be corrected.

The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to provide a Shanghai-type vibration motor that simplifies the shape of the elastic member to facilitate processing and dimensional control, improves productivity, and reduces manufacturing costs. .

Shanghai dynamic vibration motor of the present invention in order to achieve the above object; A housing mounted on an upper portion of the base; A weight body disposed between the base and the housing and vertically moving; A magnet fixedly mounted to either the weight or the base; A coil fixedly coupled to the other of the weight body or the base on which the magnet is not mounted and disposed adjacent to the magnet; An elastic member mounted to the base or the housing to elastically support the weight body in a vertical direction; It is made, including, the elastic member is formed into a plurality of independent division, the weight is arranged around the weight body so that the weight is horizontally arranged.

The elastic member may include a first fixing part connected to the base or the housing; A second fixing part connected to the weight body side; An elastic part which is movable between the first fixing part and the second fixing part in a vertical direction and is limited in flow in a horizontal direction to generate an elastic force; The first fixing part and the second fixing part are eccentrically arranged in the vertical direction, and the elastic part is bent in an inclined spiral shape to connect the first fixing part and the second fixing part.

The elastic member may include a first fixing part connected to the base or the housing; A second fixing part connected to the weight body side; A first elastic part and a second elastic part spaced apart from each other by the first fixing part and the second fixing part so as to be able to flow in an up-down direction and have a limited flow in a horizontal direction to generate an elastic force; The first fixing part and the second fixing part are eccentrically arranged in the vertical direction, and the elastic part is bent in an inclined spiral shape to connect the first fixing part and the second fixing part.

A yoke member in contact with the magnet to induce a magnetic field generated in the magnet toward the coil side; The yoke member further comprises a first yoke mounted on the lower side of the weight body, the first yoke being in contact with an upper surface of the magnet to increase the magnetic efficiency of the magnet; And a second yoke in contact with the lower side of the magnet to increase the magnetic efficiency of the magnet.

An insertion groove is formed in the weight body, and an additional weight body for inserting and fixing the weight of the weight body is inserted into the insertion groove.

According to the Shanghai dynamic vibration motor of the present invention as described above has the following effects.

 By separately forming the elastic member into a plurality, the shape of the elastic member is simplified, thereby facilitating processing and dimensional management.

In addition, by circularly arranging the plurality of elastic members around the weight body so that the weight body is horizontal, the dimensional deviation of the plurality of elastic members for supporting the weight body is reduced to reduce the frequency characteristic change and improve productivity It works.

A first fixing part connecting the elastic member to the base or the housing; By including the second fixing portion connected to the weight body side, there is an effect of increasing the contact area of the elastic member and the counterpart to facilitate the fixing of the elastic member.

In addition, it is possible to move in the vertical direction between the first fixing portion and the second fixing portion and the horizontal direction is formed to restrict the flow to form an elastic portion to generate an elastic force, thereby moving the weight body in the horizontal direction during vibration Minimization has the effect of improving the overall driving efficiency.

The elastic member may be formed between the first fixing part and the second fixing part in a vertical direction and in a horizontal direction so that the flow is limited to generate elastic force and are spaced apart from each other. By being included, there is an effect of increasing the elastic area to increase the elastic force of the elastic member.

 By configuring the yoke member as a first yoke attached to the lower side of the weight body and in contact with the upper surface of the magnet, and a second yoke in contact with the lower side of the magnet, the magnetic field generated in the magnet in the upper and lower portions, respectively, in the coil direction. By inducing it has the effect of increasing the overall magnetic efficiency.

By forming an insertion groove in the weight body and inserting and fixing an additional weight body for increasing the weight of the weight body in the insertion groove, the resonance frequency can be easily corrected by adjusting the weight of the weight body when a frequency characteristic change occurs. It has an effect.

First embodiment

3 is a perspective view of a shanghai dynamic vibration motor according to a first embodiment of the present invention, Figure 4 is an exploded perspective view of a shanghai dynamic vibration motor according to a first embodiment of the present invention, Figure 5 is a first embodiment of the present invention A perspective view of an elastic member according to an example.

As shown in FIGS. 3 to 5, the Shanghai-type vibration motor according to the first embodiment of the present invention includes a base 310, a housing 320, a weight body 330, a yoke member 340, and a magnet 350. , Including the coil 360 and the elastic member 370.

The base 310 has a disk shape and a circuit board for supplying power to the coil 360 is mounted on the upper side.

In addition, a plurality of fixing protrusions 311 protruding in the horizontal direction are formed on the outer circumferential surface of the base 310 to guide the position and prevent rotation when the housing 320 is mounted on the base 310. .

The housing 320 is mounted on the upper side of the base 310 in a cylindrical shape, the lower side is the weight body 330, the yoke member 340, the magnet 350, the coil 360 and the elastic The member 370 is opened to be inserted.

In addition, the lower side of the housing 320 is mounted a damper member 325 for absorbing the impact sound during the collision of the weight body 330.

The damper member 325 is made of a material such as rubber or sponge.

In addition, the outer circumferential surface of the housing 320 is formed with a fixing groove 321 into which the fixing protrusion 311 is inserted and is coupled to the fixing protrusion 311 when assembled.

Meanwhile, the weight body 330 is mounted to be moved up and down between the base 310 and the housing 320.

The weight body 330 is formed in a cylindrical shape, the upper and lower hollow portion 331 is formed inside, and is made of a material having a specific gravity greater than other components is very heavy.

In addition, an insertion groove 332 is formed on the upper side of the weight body 330 to increase the weight of the weight body 330.

An additional weight 333 is inserted into the insertion groove 332 to adjust the weight of the weight body 330 according to the change in frequency characteristics when the vibration motor is assembled.

That is, when the frequency characteristic change occurs by performing a characteristic test before the housing 320 is mounted on the base 310, an additional weight 333 is inserted into the insertion groove 332 to correct the resonance frequency.

As in the above formula, the resonance frequency (Fn) can be adjusted by the elastic modulus (k) of the elastic member 370 and the weight (M) of the weight body 330.

As such, the insertion groove 332 is formed in the weight body 330, and the additional weight body 333 is inserted into the insertion groove 322 to increase the weight of the weight body 330. When the change occurs, the weight of the weight body 330 is adjusted to easily correct the resonance frequency.

The weight body 330 is mounted on the yoke member 340 and moves together with the yoke member 340.

The yoke member 340 is in contact with the magnet 350 serves to guide the magnetic field generated by the magnet 350 toward the coil 360.

Specifically, the yoke member 340 is mounted to the lower side of the weight body 330 and the first yoke 341 in contact with the upper surface of the magnet 350, and the second yoke in contact with the lower side of the magnet 350 ( 342).

The first yoke 341 has a cylindrical shape and a lower outer peripheral surface thereof protrudes in a horizontal direction.

In addition, a lower end of the first yoke 341 is opened to insert the magnet 350 and is formed to surround an outer circumferential surface of the magnet 350.

The first yoke 341 is inserted into the hollow portion 331 of the weight body 330 and moves together with the weight body 330.

The second yoke 342 has a cylindrical shape, the diameter of which is the same as that of the magnet 350, and is fixed to the lower side of the magnet 350.

As described above, the yoke member 340 is attached to the lower side of the weight body 330 and is in contact with the upper surface of the magnet 350, and the second yoke is in contact with the lower side of the magnet 350. By configuring 342, the magnetic field generated by the magnet 350 is induced in the coil 360 in the upper and lower portions, respectively, to increase the overall magnetic efficiency.

On the other hand, the magnet 350 is a cylindrical shape of the upper and lower two-pole separate magnetization, the upper end is fixed to the first yoke 341, the lower end of the second yoke 342 is fixed fixed.

In addition, the magnet 350 is disposed adjacent to the coil 360, the diameter of the outer peripheral surface is formed smaller than the diameter of the inner peripheral surface of the coil 360, the magnet 350 is inserted into the coil 360 It can be formed.

The coil 360 is a ring-shaped winding of a thin wire through which a current flows, and is mounted on the upper side of the base 310.

The coil 360 is disposed adjacent to the magnet 350, and the magnet 350 is formed by an interaction between an electromagnetic field generated when power is applied to the coil 360 and a magnetic field generated by the magnet 350. Move up and down.

In some cases, the coil 360 may be mounted on the weight body 330, and the magnet 350 may be mounted on the base 310 to move up and down.

The elastic member 370 is disposed below the weight body 330 to elastically support the weight body 330 in the vertical direction.

The elastic member 370 is a leaf spring made of a thin plate material having elasticity, and is divided into a plurality of independent pieces.

In detail, the elastic member 370 includes a first fixing part 371 connected to the base 310 and a second fixing part 372 connected to the first yoke 341 in the direction of the weight body 330. And an elastic part 373 capable of flowing in the vertical direction between the first fixing part 371 and the second fixing part 372 and limited in flow in the horizontal direction to generate an elastic force.

The first fixing part 371 and the second fixing part 372 are formed to be spaced apart in the vertical direction, and the elastic part 373 is the first fixing part 371 and the second fixing part 372. It is formed to be inclined in between to generate an elastic force.

That is, the first fixing part 371 and the second fixing part 372 are mutually eccentrically arranged in the vertical direction, and the elastic part 373 is bent in an inclined spiral shape so that the first fixing part 371 and the second high The government 372 is connected.

In some cases, the elastic member 370 connects the first fixing part 371 to the housing 320 and connects the second fixing part 372 with the weight body 330 to generate elastic force. Can be.

In addition, the elastic member 370 may be made of a coil spring or a wire spring other than the leaf spring.

As described above, the conventional elastic member 370 has a plurality of elastic parts 373 formed in a disk shape, which is very complicated. However, as in the first embodiment of the present invention, a plurality of elastic members 370 are independent. By dividing, the shape of the elastic member 370 is simplified, there is an effect of facilitating processing and dimension management.

In addition, the elastic member 370, the first fixing part 371 connected to the base 310, and the second fixing part 371 connected to the first yoke 341 on the weight body 330 side. By including a configuration, by increasing the contact area between the base 310 and the first yoke 341 to facilitate the fixing of the elastic member 370, the first fixing portion 371 and the second Between the fixed portion 372 is formed to be able to flow in the vertical direction and the flow is limited in the horizontal direction to form an elastic portion 373 to generate an elastic force, so that the weight 330 moves in the horizontal direction during vibration Minimizing this has the effect of improving the overall driving efficiency.

On the other hand, the elastic member 370 is disposed at the same interval circularly around the weight body 330 so that the weight body 330 is horizontal.

That is, a total of three elastic members 370 having the same shape are circularly disposed at intervals of about 120 degrees with respect to the center point of the weight body 330.

At this time, since the elastic members 370 are all processed in the same processing frame, the dimension tolerance is small.

The elastic member 370 has a modulus of elasticity that varies according to dimensions, thereby changing a resonance frequency.

However, the elastic member 370 processed in the same processing frame minimizes the dimensional tolerances, thereby reducing the change in the resonance frequency.

As described above, the plurality of elastic members 370 processed in the same frame are circularly disposed around the weight body 330 such that the weight body 330 is horizontal, thereby supporting the weight body 330. The dimensional deviation of the two elastic members 370 is reduced, thereby reducing the frequency characteristic change and improving productivity.

The following describes the operation of the present invention according to the above configuration.

6 to 8 are diagrams illustrating the operation of the Shanghai-type vibration motor according to the first embodiment of the present invention.

As shown in FIG. 6, before the power is applied to the coil 360, the weight 330 is formed by the elastic force of the elastic member 370 together with the magnet 350 and the yoke member 340. It is supported upward of the base 310.

Subsequently, power is applied to the coil 360 as shown in FIG. 7, and the magnet 350 is moved to the coil by an interaction between the electromagnetic field generated by the coil 360 and the magnetic field of the magnet 350. It moves in the (360) direction, ie downward direction.

In this case, the weight body 330 and the yoke member 340 move downward with the magnet 350.

In addition, the elastic member 370 is compressed as the yoke member 340 moves in the coil 360 direction.

Subsequently, as shown in FIG. 8, when the direction of the power applied to the coil 360 is reversely supplied, the magnet 350 moves in the opposite direction to the coil 360, that is, in the upward direction.

At this time, the weight body 330 is moved to the upper surface of the housing 320 together with the magnet 350 and the yoke member 340 by the expansion force of the elastic member 370.

When the vertical movement of the weight body 330 is repeated, the elastic member 370 vibrates up and down to generate a resonance frequency.

This resonant frequency vibrates the base 310 or the housing 320 to transmit vibration to the outside.

In this way, by separately forming the elastic member 370 into a plurality, the shape of the elastic member 370 is simplified to facilitate processing and dimensional management, and the plurality of elastic members 370 processed in the same frame. By circularly arranging the weight body 330 around the weight body 330 so that the weight body 330 is horizontal, dimensional deviations of the plurality of elastic members 370 supporting the weight body 330 are reduced, thereby changing frequency characteristics. It has the effect of reducing and improving productivity.

Second embodiment

8 is a perspective view of an elastic member according to a second embodiment of the present invention.

Shanghai vibration vibration motor according to the second embodiment of the present invention is the same as the first embodiment except for the elastic portion of the elastic member 470.

As shown in FIG. 9, in the second embodiment, the elastic member 470 may include a first fixing part 471, a second fixing part 472, a first elastic part 473, and a second elastic part 474. It is made to include.

The first fixing part 471 is connected to the base 310 as in the first embodiment, and the second fixing part 472 is also located on the weight body 330 side as in the first embodiment. 1 yoke 341 is connected.

The first elastic portion 473 and the second elastic portion 474 can flow in the vertical direction between the first fixing portion 471 and the second fixing portion 472 as in the first embodiment. Flow is limited in the horizontal direction to generate an elastic force, but are formed spaced apart from each other.

Both ends of the first elastic part 473 are connected to the first fixing part 471 and the second fixing part 472, respectively, and are formed inside the shorter than the second elastic part 474. Both ends of the second elastic part 474 are connected to the first fixing part 471 and the second fixing part 472, respectively, and are formed longer than the second elastic part 474 and disposed outside.

That is, the first fixing part 471 and the second fixing part 472 are mutually eccentrically arranged in the vertical direction, and the first elastic part 473 and the second elastic part 474 are bent in a spiral to be bent. The first fixing part 471 and the second fixing part 472 are connected.

As described above, the elastic member 470 is formed to be movable between the first fixing part 471 and the second fixing part 472 in the vertical direction and the flow is restricted in the horizontal direction to generate the elastic force. By including the first elastic portion 473 and the second elastic portion 474 formed spaced apart from each other, there is an effect of increasing the elastic area to increase the elastic force of the elastic member 470.

Shanghai dynamic vibration motor of the present invention is not limited to the above-described embodiment, it can be carried out in a variety of modifications within the range allowed by the technical idea of the present invention.

1 is a perspective view of a conventional Shanghai dynamic vibration motor,

2 is an exploded perspective view of a conventional Shanghai dynamic vibration motor,

3 is a perspective view of a Shanghai-type vibration motor according to a first embodiment of the present invention,

4 is an exploded perspective view of the Shanghai-type vibration motor according to the first embodiment of the present invention;

5 is a perspective view of an elastic member according to a first embodiment of the present invention;

6 to 8 is an operation state diagram of the Shanghai-type vibration motor according to the first embodiment of the present invention,

9 is a perspective view of an elastic member according to a second embodiment of the present invention.

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

310: base, 320: housing, 330: weight, 332: insertion groove, 340: yoke member, 341: first yoke, 342: second yoke, 350: magnet, 360: coil, 370,470: elastic member,

Claims (5)

A base; A housing mounted on an upper portion of the base; A weight body disposed between the base and the housing and vertically moving; A magnet fixedly mounted to either the weight or the base; A coil fixedly coupled to the other of the weight body or the base on which the magnet is not mounted and disposed adjacent to the magnet; An elastic member mounted to the base or the housing to elastically support the weight body in a vertical direction; , &Lt; / RTI &gt; The elastic member is formed in a plurality of independent division, Shanghai-type vibration motor, characterized in that the mass is disposed around the weight body so as to maintain a horizontal. The method of claim 1, The elastic member, A first fixing part connected to the base or the housing; A second fixing part connected to the weight body side; An elastic part which is movable between the first fixing part and the second fixing part in a vertical direction and is limited in flow in a horizontal direction to generate an elastic force; Including but not limited to, The first fixing part and the second fixing part are mutually eccentrically arranged in the vertical direction, and the elastic part is bent in an inclined spiral to connect the first fixing part and the second fixing part. The method of claim 1, The elastic member, A first fixing part connected to the base or the housing; A second fixing part connected to the weight body side; A first elastic part and a second elastic part spaced apart from each other by the first fixing part and the second fixing part so as to be able to flow in an up-down direction and have a limited flow in a horizontal direction to generate an elastic force; Including, The first fixing part and the second fixing part are mutually eccentrically arranged in the vertical direction, and the elastic part is bent in an inclined spiral to connect the first fixing part and the second fixing part. 4. The method according to any one of claims 1 to 3, A yoke member in contact with the magnet to induce a magnetic field generated in the magnet toward the coil side; It is made, including more The yoke member is, A first yoke mounted on the lower side of the weight body to increase a magnetic efficiency of the magnet in contact with an upper surface of the magnet; And a second yoke in contact with the lower side of the magnet to increase the magnetic efficiency of the magnet. 4. The method according to any one of claims 1 to 3, And an insertion groove formed in the weight body, and inserting and fixing an additional weight body for increasing the weight of the weight body in the insertion groove.

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