KR102277662B1 - The linear vibration motor and that manufacturing method - Google Patents

Abstract

The present invention relates to a linear vibration motor and a method for manufacturing the same, wherein the two magnets have the same polarity facing each other while having two magnets extending in the vibration direction while allowing horizontal vibration to occur. When moving in the direction, magnetic force acts in the reverse direction to make short and strong vibrations;
A square plate-shaped bracket that has a rectangular parallelepiped shape by mutual coupling and a space portion is formed therein, a hexahedral case with an open lower part, a coil installed on the upper part of the bracket and supplied with external power, and the coil A weight having a magnet adjacent to the upper portion and vibrating horizontally by a mutual electromagnetic field action with the coil, and a spring disposed between both sides of the weight in the vibration direction of the weight and the case to apply an elastic repulsive force In a linear vibration motor;
an FPCB, which is an insulating substrate having flexibility, is attached to the upper surface of the bracket, and a coil is attached to the upper surface of the FPCB, and then power is connected;
a damper made of a sponge is attached to the center of the two inner surfaces of the case to which the spring is joined;
The weight is formed by being spaced apart from two magnet insertion holes having the same shape in the vibration direction, so that the magnets are inserted so that the same polarity faces each other and fixedly attached, and the upper and lower surfaces including the magnet insertion hole and the vibration direction of both sides and A yoke seating groove formed by being recessed in the same width with the same width is formed on the edge of the same direction, so that the 'C'-shaped yoke in which both ends are bent vertically downward is seated on the upper surface and both sides and fixed by adhesion;
The spring is a case junction part that is fusion-bonded along the side edge of the case, a yoke junction part fusion-bonded to the side surface of the yoke, and an elastic restoring part integrally connecting the case junction part and the yoke junction part Linear vibration characterized in that It relates to a motor and a method for manufacturing the same.

Description

The linear vibration motor and its manufacturing method

The present invention relates to a linear vibration motor and a method for manufacturing the same, and more specifically, the two magnets have the same polarity while having two magnets extending the N pole and the S pole in the vibration direction while allowing horizontal vibration to occur. The present invention relates to a linear vibration motor developed to face each other so that when moving in one direction, magnetic force acts in the opposite direction to generate short and strong vibration, and a method for manufacturing the same.

Vibration motors that generate vibration are used in various fields such as various health products and medical devices, but the most used among them is mainly used for transmitting signals without generating external noise in portable devices including mobile phones. In particular, in the field of mobile phones, which are getting thinner and thinner, a small and precise vibration motor is required.

Conventionally, most of the vibration motors used in mobile phones apply the principle of a general motor as it is, but have a weight that allows the rotating rotor to be eccentric, that is, a weight so that mechanical vibration can be obtained according to the rotation.

However, in this structure, electrical contact is made by the brush of a thin metal plate to supply electricity to the coil of the rotor, and as the rotation is repeated, electric sparks and abrasion occur to contaminate the interior and reduce the service life due to the abrasion of the brush. It had its limitations.

To this end, a linear vibration motor that generates vibration while reciprocating in a linear straight line has been developed and used. Strictly speaking, it is preferable to call it a linear vibrator with a structure different from the motor, but the industry calls it a motor.

There are two types of linear vibration motors, one in the form of a disk and one in the form of a square plate. The internal vibrator moves up and down and moves in the horizontal direction. In the vertical motion, the amount of vibration depends on the product of the weight and displacement of the vibrator. Since it is proportional, it is necessary to increase the weight or displacement of the vibrator in order to secure the necessary amount of bodily vibration, which causes the thickness to increase.

Therefore, it is necessary to continuously study in the direction of making a linear vibration motor that vibrates in the horizontal direction suitable for the recent slimming trend of mobile phones in a small size, yet more stable and powerful vibration.

Korean Patent Registration No. 10-072017-0000 (May 14, 2007) Korean Patent Registration No. 10-0933179-0000 (December 11, 2009) Korean Patent Registration No. 10-1078597-0000 (October 26, 2011) Korean Patent Registration No. 10-1151396-0000 (May 23, 2012) Korean Patent Registration No. 10-1434554-0000 (August 20, 2014)

The present invention has been developed to solve the above-mentioned problems, and its object is to develop a linear vibration motor and a method for manufacturing the same so that a linear motor vibrating in the horizontal direction can generate stronger vibration while having excellent durability. have.

Another aspect is to develop a linear vibration motor and a method for manufacturing the same so that a spring mounted on the linear vibration motor can be seated and welded at an accurate position.

In order to achieve the above object, the present invention has a rectangular plate-shaped bracket that has a rectangular parallelepiped shape by mutual coupling and a space portion is formed therein, a hexahedral-shaped case with an open lower portion, and is installed on the upper portion of the bracket and installed on the outside A coil to which power is supplied, a magnet is provided adjacent to the upper portion of the coil, and a weight that vibrates horizontally by a mutual electromagnetic field action with the coil, and is disposed between both sides in the vibration direction of the weight and the case A linear vibration motor comprising a spring acting an elastic repulsive force;

an FPCB, which is an insulating substrate having flexibility, is attached to the upper surface of the bracket, and a coil is attached to the upper surface of the FPCB, and then power is connected;

a damper made of a sponge is attached to the center of the two inner surfaces of the case to which the spring is joined;

In the weight, two magnet insertion holes having the same shape in the vibration direction are spaced apart, and the magnets are inserted so that the same polarity faces each other and are fixedly attached, and the upper and lower surfaces including the magnet insertion hole and the vibration direction of both sides and A yoke seating groove formed by being recessed in the same width with the same width is formed on the edge of the same direction, so that the 'C'-shaped yoke in which both ends are bent vertically downward is seated on the upper surface and both sides and fixed by adhesion;

The spring is characterized in that it consists of a case junction part that is fusion-bonded along the side edge of the case, a yoke junction part that is fusion-bonded to the side surface of the yoke, and an elastic restoration part that integrally connects the case junction part and the yoke junction part.

In addition, the case is characterized in that each of the two inner surfaces to which the case junction of the spring is joined is provided with two positioning protrusions each protruding so as to be in close contact with the inner corners of the case junction having a square ring shape facing each other.

In addition, the case is formed with two positioning holes penetrating adjacent to diagonally opposite corners on the two inner surfaces to which the case junction of the spring is joined, and the case junction has a protrusion to be inserted into the positioning hole. characterized.

In addition, the bracket assembly by the process of preparing a square plate-shaped bracket, attaching a flexible insulating substrate FPCB to the upper surface of the bracket, and connecting a power source after attaching a coil to the upper surface of the FPCB and preparing;

Preparing a case assembly by the process of preparing a case of a rectangular parallelepiped with an open bottom and attaching a damper made of a sponge to the center of two inner surfaces to which the springs of the case are joined;

The process of preparing a weight in which two magnet insertion holes having the same shape in the vibration direction are spaced apart and formed with a yoke seating groove formed by steppingly recessed with the same width in the edge in the same direction as the vibration direction; A process in which magnets are inserted so that the same polarity faces each other in the insertion hole and adhesively fixed, and a 'C'-shaped yoke in which both ends are bent vertically to the upper surface and both sides of the yoke seating groove, and two Preparing a weight assembly formed by the process of joining the yoke joint of the four springs to both sides of the yoke, respectively;

inserting the weight assembly into the case assembly and fusion fixing the case joint formed on the spring to the case;

and coupling the case and the bracket assembly.

As described above, the present invention is arranged so that the direction of magnetic force is opposite to each other so that the two magnets have the same polarity to face each other while having two magnets having the N pole and the S pole extending in the vibration direction on the weight. If the force is applied in the direction of strong movement in the opposite direction, there is an effect that the amplitude is short and strong vibration is made.

In addition, there is an effect that the two springs are seated at the correct positions to generate vibrations of values close to the optimum vibration frequency in design.

1 is a perspective view according to an embodiment of the present invention;
2 is an exploded perspective view according to an embodiment of the present invention;
3 is a side cross-sectional view according to an embodiment of the present invention;
4 is a plan cross-sectional view according to an embodiment of the present invention;
5 is a perspective view showing a case according to an embodiment of the present invention;
6 is a block diagram according to an embodiment of the present invention;
7 to 10 are conceptual views illustrating a manufacturing process according to an embodiment of the present invention;

Accordingly, the configuration of the present invention will be described in detail so that those skilled in the art can easily understand and reproduce with reference to the accompanying drawings.

1 is a perspective view according to an embodiment of the present invention, FIG. 2 is an exploded perspective view according to an embodiment of the present invention, FIG. 3 is a side cross-sectional view according to an embodiment of the present invention, and FIG. A planar cross-sectional view according to an embodiment, a rectangular plate-shaped bracket 11 having a rectangular parallelepiped shape by mutual coupling and forming a space therein, a hexahedral-shaped case 12 with an open lower portion, and the bracket 11 ), a coil 13 to which power is supplied from the outside and a magnet 14 are provided adjacent to the upper portion of the coil 13 and vibrates horizontally by a mutual electromagnetic field action with the coil 13 In the linear vibration motor (1) comprising a weight (15) and a spring (16) disposed between both sides of the vibration direction of the weight (15) and the case (12) to apply an elastic repulsive force. ;

FPCB 111, which is a flexible insulating substrate, is attached to the upper surface of the bracket 11, and a coil 13 is attached to the upper surface of the FPCB 111, and then power is connected;

a damper 121 made of a sponge is attached to the center of the two inner surfaces to which the spring 16 of the case 12 is bonded;

The weight 15 is formed by being spaced apart from two magnet insertion holes 151 having the same shape in the vibration direction, so that the magnets 14 are inserted so that the same polarity faces each other and fixedly attached, and the magnet insertion hole 151 ), a yoke seating groove 152 formed by being recessed in the same width as the edge in the same direction as the vibration direction of the upper and lower surfaces and both sides is formed, and both ends of the yoke are bent vertically downwards. (153) is seated on the upper surface and both sides to be adhesively fixed;

The spring 16 includes a case junction 161 that is fusion-bonded along the side edge of the case 12, a yoke junction 162 that is fusion-bonded to the side of the yoke 153, and the case junction 161. and the yoke joint 162 showed a linear vibration motor, characterized in that it is composed of an elastic restoring part 163 integrally connected.

The biggest characteristic of the linear vibration motor 1 of the present application lies in the number and arrangement of the magnets 14, and it can be said that the two magnets 14 are arranged on a line in the vibration direction so that the same polarity faces each other.

In general, the direction of the force according to the current and the magnetic field is applied by Fleming's left hand rule. The direction of the current flows in opposite directions when applied to the two magnets 14 due to the shape of the coil 13, and the two magnets 14 Since the direction of the magnetic field is opposite, the applied force acts in the same direction.

Afterwards, when the weight 15 moves, the force gradually decreases, and when it moves to the vicinity of another magnet 14, the force acts in the opposite direction. If compared to a swing, it pushes once from the center position and moves in the opposite direction at the end point of movement. By pushing, the same phenomenon occurs as if the force is applied once more than the conventional linear vibration motor.

Therefore, the amplitude is short and strong vibration is generated, and the vibration is 1.5 times stronger than that of the conventional vibration motor.

At this time, the interval between the two magnets 14 should be designed to be an optimized interval that can prevent the magnetic force from weakening and minimize mutual interference, and the yoke 153 prevents the magnet 14 from being separated and the magnetic force leaks upward. should be reduced

In addition, the damper 121 mounted on the case 12 of the present application serves to reduce noise while absorbing shock.

In addition, in the present application, the case 12 has two inner surfaces to which the case joint portion 161 of the spring 16 is joined, and two inner corners of the case joint portion 161 having a square ring shape are penetrated so as to be in close contact with each other. An embodiment characterized in that each of the positioning protrusions 122 is provided is additionally presented.

In the above embodiment, the spring 16 on both sides based on the weight 15 should apply an elastic restoring force in the same direction and force, and to prevent a minute distortion from occurring in the process of fusion fixing the spring 16. It was seated in the correct position through the positioning protrusion 122 to operate at the set vibration frequency.

In addition, when assembling, the position adjusting protrusion 122 may be formed by inserting a pin into the through hole and coupling the case junction part 161 in a state protruding to the inside, and separating the pin when the fusion is completed.

5 is a perspective view showing a case according to an embodiment of the present invention, wherein the case 12 penetrates adjacent to the diagonally facing corners on two inner surfaces to which the case junction part 161 of the spring 16 is joined. Two position adjustment holes 123 are formed, and a projection (not shown) inserted into the position adjustment hole 123 is formed in the case junction part 161 .

In the above embodiment, when manufacturing the case 12 , it is easier to simply form a hole than the process of forming the above-described positioning protrusion 122 inside the case 12 , and in the case of the spring 16 made of metal, the case junction part 161 ) is the embodiment presented because the operation of forming the protrusion is easy.

When the protrusion of the case junction part 161 is seated in the position adjustment hole 123 formed in this way, the spring 16 can be seated in an accurate position.

6 is a block diagram according to an embodiment of the present invention, and FIGS. 7 to 10 are conceptual views illustrating a manufacturing process according to an embodiment of the present invention.

In step 510 , the linear vibration motor manufacturing apparatus prepares a square plate-shaped bracket 11 .

In step 511 , the linear vibration motor manufacturing apparatus attaches the FPCB 111 , which is a flexible insulating substrate, to the upper surface of the bracket 11 .

In step 512 , the linear vibration motor manufacturing apparatus attaches the coil 13 to the upper surface of the FPCB 111 , and connects power to the coil 13 .

Steps 510 to 512 may be regarded as a step of preparing the bracket assembly.

In step 520, the linear vibration motor manufacturing apparatus prepares a case 12 of a rectangular parallelepiped with an open bottom.

In step 521 , the linear vibration motor manufacturing apparatus adheres the damper 121 made of a sponge to the center of the two inner surfaces where the spring 16 is bonded to the case 12 .

Steps 520 to 521 may be regarded as preparing the case assembly.

In step 530, the linear vibration motor manufacturing apparatus is a yoke in which two magnet insertion holes 151 having the same shape in the vibration direction are spaced apart and recessed in the same width at the edge in the same direction as the vibration direction. A weight 15 in which a seating groove 152 is formed is prepared.

In step 531, the linear vibration motor manufacturing apparatus inserts the magnets 14 in the magnet insertion hole 151 so that the same polarities face each other and is fixedly attached.

In step 532, the linear vibration motor manufacturing apparatus is fixed by bonding the yoke 153 of the 'C' shape in which both ends are bent vertically to the upper surface and both sides of the yoke seating groove 152 .

In step 533, the linear vibration motor manufacturing apparatus bonds the yoke joint portions 162 of the two springs 16 to both sides of the yoke 153, respectively.

Steps 530 to 533 may be regarded as steps for preparing the weight assembly.

In step 540 , the linear vibration motor manufacturing apparatus inserts the weight assembly into the case assembly and fusion-bonds the case junction 161 formed on the spring 16 to the case 12 .

In step 520, the linear vibration motor manufacturing apparatus assembles and fixes the case 12 and the bracket assembly.

Thus, manufacturing each of the three assemblies in the present application and assembling them sequentially is easy for mass production because division of labor is facilitated, and it is advantageous for partially automating each process, thereby improving productivity.

1: Linear vibration motor
11: Bracket
111: FPCB
12 : case
121: damper 122: position adjustment projection
123: position adjustment hole
13: coil
14: magnet
15: weight
151: magnet insertion hole 152: yoke seating groove
153: York
16: spring
161: case joint 162: yoke joint
163: elastic restoration part

Claims (9)

A coil 13 to which power is supplied, and a magnet 14 adjacent to the upper portion of the coil 13 are provided, and a weight 15 and elastic which vibrate horizontally by mutual electromagnetic field action with the coil 13 In the linear vibration motor (1) comprising a spring (16) for vibrating the weight (15) using a repulsive force;
A flexible insulating substrate FPCB 111 is attached to the upper surface of the bracket 11 of the linear vibration motor, and the coil 13 is attached to the upper surface of the FPCB 111 and then power is connected;
Two magnet insertion holes 151 having the same shape in the vibration direction of the weight 15 are formed to be spaced apart, and a plurality of magnets 14 arranged in the vibration direction are inserted so that the same polarity faces each other and fixed by adhesion become,
The weight 15 is disposed spaced apart in a direction orthogonal to the vibration direction with the magnets interposed therebetween,
The bracket is in the shape of a square plate,
Further comprising a case 12 coupled to the bracket and having a rectangular parallelepiped shape with an open lower portion to form a space therein,
The case 12 has two positioning protrusions protruding so as to be in close contact with the inner corners facing each other of the case junction part 161 having the shape of a square ring on two inner surfaces to which the case junction part 161 of the spring 16 is joined. (122);
In the case 12, two positioning holes 123 penetrating adjacent to diagonally opposite corners are formed on two inner surfaces to which the case junction part 161 of the spring 16 is joined, and the case junction part 161 is formed. ) is a linear vibration motor, characterized in that the projection is formed to be inserted into the position adjustment hole (123). delete delete According to claim 1,
A linear vibration motor, characterized in that a damper 121 made of a sponge is attached to the center of the two inner surfaces to which the spring 16 of the case 12 is bonded. According to claim 1,
The yoke seating groove 152 is formed by being recessed with the same width on the edges in the same direction as the vibration direction of the upper and lower surfaces and both sides including the magnet insertion hole 151, so that both ends are bent vertically down Linear vibration motor, characterized in that the yoke (153) of the 'c' shape is seated on the upper surface and both sides and is fixed by adhesion. According to claim 1,
The spring (16) is disposed between both sides of the case (12) in the vibration direction of the weight (15) and includes a spring (16) for applying an elastic repulsive force. 6. The method of claim 5,
The spring 16 includes a case junction 161 that is fusion-bonded along the side edge of the case 12, a yoke junction 162 that is fusion-bonded to the side of the yoke 153, and the case junction 161. A linear vibration motor, characterized in that it is composed of an elastic restoration portion 163 integrally connecting the yoke joint portion (162). delete delete

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