KR20150080673A - Linear vibrating motor - Google Patents

Abstract

The present invention relates to a linear vibrating motor. According to the present invention, the linear vibrating motor has a structure in which upper and lower casings are bonded and fixed by a magnet installed in an edge part of the upper and lower casings, a coil part is formed on an outer edge part of a solid core type heavy object having a relatively big diameter, and the heavy object is suspended and fixed by an elastic member. According to the present invention, the linear vibrating motor is capable of generating strong vibrating force by relatively big electromagnetic force and magnetic force following an increase in the volume of coil and magnetic parts as well as an increase in the weight of the heavy object; enabling relatively low current operation; reducing the power consumption of a battery of a mobile device by indicating a low consumption current value; minimizing an influence on a vibrating part, caused by a component or outer metal device, by forming the coil part in the vibrating part; enabling a quick response of the vibrating part by choosing a suspension structure of the vibrating part to fix an end of the elastic member with the upper casing; controlling response intensity by a difference in vibration intensity or controlling vibrating force for preventing a missing call; having high economic feasibility by having assembly productivity improved by reducing the number of components and simplifying the structure; preventing a short circuit or leakage between the heavy object and the coil; and having a structure with reduced noise.

Description

[0001] LINEAR VIBRATING MOTOR [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear vibration motor, and more particularly, to a linear vibration motor capable of effectively transmitting a vibration signal corresponding to a vibration force due to repeated reciprocating linear motion of a vibrator in a vertical direction to a stator, will be.

Generally, a 'vibrating motor' is a part that generates vibration by converting electrical energy input from outside into mechanical kinetic energy, and it can be classified into a coin type and a bar type according to its type. And can be classified into a rotating type motor, a linear type motor, and a swinging type motor depending on the motion type.

As a typical vibration motor widely applied to mobile devices such as a smart phone, a coin type vibration motor suitable for miniaturization and slimness is widely used. In the case of converting a mobile device into a silent mode in a public place or the like, Generation of the incoming vibration that enables the received signal to be perceived, and generation of the vibration that occurs as a response to the signal input when the touch screen is touched.

Among the above-mentioned coin type vibration motors, the rotation type vibration motors generate vibrations through rotation, and thus have a merit that the vibration amount is large and the manufacturing cost is low. However, the reaction speed is slow to 300 milliseconds (ms) And a bar type vibration motor has a quick response speed of about 60 ms. However, since it is difficult to realize various vibration modes and power consumption is high, it is only applied to low-cost phones.

On the other hand, among the above-mentioned coin type vibration motors, since the linear vibration motors realize up-and-down linear vibration, the reaction speed is as fast as about 50 ms, various vibration modes can be realized, power consumption is relatively low, It is mainly used for touch screen feedback and has almost no unnecessary residual vibration. However, there is a disadvantage that vibration power is about half that of a rotary type vibration motor and error frequency is high in vibration movement. Although it can be solved by increasing the dimension of the linear vibration motor, there is a problem in that it is not practically possible to increase the dimension of the linear vibration motor in order to strengthen the vibration power, because the slimization is a recent trend.

As described above, the vibration motor which is mounted on the mobile device and notifies the user of the received signal by the vibration, not the sound, has a strong vibration force for preventing missing call, a semi-permanent longevity reputation, In addition to this, it is required to adjust the intensity of vibration force to prevent mis-calls according to the situation, or to create a more vivid game environment in game machines or game phones It is desirable to be able to adjust the response strength by the difference in the strength of the vibration power for the vibration.

Conventional conventional linear vibration motor 1 'is disclosed in Korean Patent Laid-Open Publication No. 10-2011-0006519 (published on Jan. 20, 2011), Korean Laid-Open Patent Publication No. 10-2012-0013718 (Published on Feb. 15, 2012), Korean Patent Publication No. 10-2012-0077402 (published on July 10, 2012), Korean Patent Laid-Open Publication No. 10-2013-0015722 (published on March 23, 2013) 3, the basic structure of which is shown in Fig. 3, in which the vibrating portion 10, the fixing portion 20, and the elastic member 30 (see Fig. 3) The vibration unit 10 includes a loop-like weight 11, a yoke 12 fitted in the yoke 12, and a permanent magnet 13 mounted at the center of the yoke 12 The fixed part 20 includes lower and upper casings 21 and 22 and a coil part 23 provided outside the lower side of the permanent magnet 13.

Here, the above-described elastic member 30, which is typically formed of a spring, is mounted on the upper casing 21 in the illustrated example. However, when the elastic member 30 is mounted on the lower casing 22 In addition, the above-mentioned coil part 23 may be mounted on the upper casing 21.

The magnetic force generated by the permanent magnet 13 and the current applied to the coil portion 23 cause the interaction between the electromagnetic force generated in the coil portion 23 and the elastic force of the elastic member 30, In addition, in the figure, reference numeral 14 denotes a magnetic plate.

However, since the linear vibration motor 1 'having the above-described structure has the weight 11 formed in a loop shape, there is a limit to increase the weight and it is difficult to exhibit a large vibration force. It is required to have a relatively high current and a high power consumption for driving because it is located at a small diameter in the inner lower region of the yoke 12 and the processing and assembly productivity due to the increase in the number of parts including the yoke 12, There is a problem that it is not sufficiently satisfactory.

A typical example of the conventional linear vibration motor 1 " is disclosed in Korean Patent Laid-Open Publication No. 10-2013-0021734 (published on March 23, 2013) and Korean Patent Publication No. 10-1156867 ), And Korean Patent Laid-Open Publication No. 10-2013-0015344 (published on March 23, 2013). As shown in Fig. 4, the basic structure includes a vibrating portion 10 having a hollow hole 16, And a fixing portion 20 and an elastic member 30 including the permanent magnets 23 and 24 positioned in the hollow hole 16. [

The vibrating portion 10 in the illustrated example is constituted by a loop-shaped weight 11, a yoke 12 fitted in the yoke 12, and a coil portion 13 provided on the inner periphery of the yoke 12 One end of an FPCB (Flexible Printed Circuit Board) is attached to the inner peripheral lower end portion of the loop-like weight body 11 and the other end is joined to the upper surface of the lower casing 22 To an external input power source.

The fixing portion 20 includes upper and lower casings 21 and 22 and upper and lower permanent magnets 23 and 24 installed in the hollow hole 16 of the vibration portion 10, And the plate yoke 25 disposed between the upper and lower permanent magnets 23 and 24. In some cases, only one of the upper and lower permanent magnets 23 and 24 may be provided.

The electromagnetic force generated by the coil portion 13 due to the magnetic force of the central upper and lower permanent magnets 23 or 24 and the current applied to the coil portion 13 and the interaction of the electromagnetic force generated by the elastic member 30 The vibrating portion 10 is capable of causing resonance to rise up and down through the hollow hole 16 with the upper and lower permanent magnets 23 and 24. The unexplained reference numerals 21a and 22b denote elastic members Is a damper.

However, since the linear vibrating motor 1 " structured as described above is also constructed in a loop shape, there is a limit in weight increase and it is difficult to exhibit a large vibrating force, A relatively large current is required for driving and a high power consumption because it is located at a relatively small diameter inside the yoke 12 provided on the inner periphery of the weight 11 as described above. There is a problem that productivity of fabrication and assembly due to an increase in the number of parts and complicated parts is not satisfactory enough.

Open Patent Publication No. 10-2011-0006519 (published on January 20, 2011) Open Patent Publication No. 10-2012-0013718 (Feb. 15, 2012) Open Patent Publication No. 10-2012-0077402 (Published July 10, 2012) Japanese Patent Application Laid-Open No. 10-2013-0015722 (published on March 14, 2013) Published Japanese Patent Application No. 10-2005-0121945 (Dec. 28, 2005) Published Japanese Patent Application No. 10-2013-0021734 (published on Mar. 03, 2013) Patent Registration No. 10-1156867 (registered on June 6, 2012) Japanese Patent Application Laid-Open No. 10-2013-0015344 (published on February 14, 2013)

Therefore, it is a first object of the present invention to provide a linear vibration motor capable of reducing the number of components by simplifying the structure of the vibrating part and generating a strong vibration force by increasing the weight.

A second object of the present invention is to provide a linear vibration motor capable of reducing the power consumption of a battery of a mobile device due to the generation of a strong vibration force by a relatively large electromagnetic force and a magnetic force, .

A third object of the present invention is to provide a linear vibration motor in which the vibration part can minimize the influence of external metal devices or parts by forming a coil part in the vibration part.

A fourth object of the present invention is to provide a vibration damping device for a vibration damping device which adopts a vibration damping structure for fixing one end of an elastic member to an upper casing, And to provide a linear vibration motor capable of adjusting the response strength of the linear vibration motor.

A fifth object of the present invention is to provide a linear vibration motor having a reduced number of parts and a high economic efficiency due to improved assembly productivity.

A sixth object of the present invention is to provide a linear vibration motor having a reduced noise generation structure without any leakage, leakage, or short circuit between the weight and the coil.

According to a preferred aspect of the present invention, there is provided an upper and lower casing, a bottom surface bonded to the lower casing, and an outer peripheral edge connected to the upper casing A fixed portion including a loop-shaped magnet bonded to a bottom portion of the inner periphery; A vibrating part including a solid body and an integral type weight body and a coil part provided on the outer peripheral edge of the weight body; An elastic member whose one end is forcibly press-fitted and fixed to the inner periphery of the upper end of the upper casing and the other end is forcibly press-fitted to the upper portion of the weight; (Flexible Printed Circuit Board) having one end connected to the outer periphery of the bottom surface of the weight body and the other end connected to the external power source through the upper surface of the lower casing. A vibration motor is provided.

Here, the height of the magnet is located below the center of the vertical length of the coil part.

The middle and lower ends of the outer periphery of the weight have an inner side bordered by the step, and a concave face is formed on the bottom face adjacent to the outer periphery of the weight. The coil portion is located at the inner side, and one end of the FPCB may be connected to the concave surface.

A recessed portion may be formed on an inner peripheral bottom of the upper casing to which the outer periphery of the magnet is bonded and a recessed portion may be formed on an upper surface adjacent to the outer periphery of the lower casing to which the bottom of the magnet is bonded, .

  Further, the upper casing and the lower casing may be provided with a damper made of an elastic body.

Wherein an elastic member holder is fitted in a region adjacent to an inner periphery of an upper end of the upper casing, a loop-shaped groove is formed in an upper portion of the weight, a weight holder is fitted in the groove, And the other end of the elastic member can be inserted and fixed in the weight holder.

  The elastic member holder and the weight holder may be loop-shaped.

The damper installed in the upper casing and the lower casing may be loop-shaped.

The outer surface of the weight may be Teflon coated.

The linear vibration motor according to the present invention can generate a strong vibration force by a relatively large electromagnetic force and a magnetic force in accordance with an increase in the weight of the weight body and an increase in volume of the coil portion and the magnet portion, Of course, since the current consumption value is low, the power consumption of the battery of the mobile device can be reduced. By forming the coil part on the vibrating part, it is possible to minimize the influence on the vibrating part by the external metal device or parts, By adopting the vibration part suspension structure which fixes one end of the member to the upper casing, it is possible to adjust not only the prompt response of the vibrating part but also the vibration power for prevention of missing call or the response strength by the difference of vibration intensity, , The number of parts is reduced, and the structure is simplified, the assembly efficiency is improved, There is no fear of leakage, leakage, or short-circuit between the weight and the coil, and has a reduced noise generating structure.

1 is a side sectional view of a linear vibration motor according to the present invention.
2 is an exploded perspective view of FIG.
3 is a cross-sectional view of a typical conventional linear vibration motor for explaining the operating state of a conventional linear vibration motor.
4 is a cross-sectional view of another typical conventional linear vibration motor.

The term mobile device used throughout the present specification refers to a device such as a smart phone, a feature phone, an MP3, a PMP, a PDA, a laptop, a mini notebook, a UMPC, a tablet PC, a navigation device, Phone, electronic dictionary, and the like, and may specifically refer to a smartphone or a game phone.

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

Fig. 1 is a side sectional view of a linear vibration motor 1 according to the present invention, Fig. 2 is an exploded perspective view of Fig. 1, and will be referred to for convenience of explanation.

The linear vibration motor 1 according to the present invention comprises a vibration section 10, a fixing section 20 and an elastic member 30 and an FPCB 40 connected to the vibration section and drawn out to the outside.

The vibrating unit 10 includes a weight 11 formed in a solid shape and a coil 12 mounted on the outer periphery of the weight 11, And the fixing portion 20 described above includes an upper casing 21 and a lower casing 22, a bottom surface bonded to the lower casing 22 and an outer peripheral edge bonded to the inner peripheral bottom of the upper casing 21 Shaped magnet 23. The elastic member 30 has one end forcibly press-fitted to the inner periphery of the upper end of the upper casing 21 and the other end is fixed to the upper portion of the weight 11 The flexible printed circuit board (FPCB) 40 has one end connected to the outer periphery of the bottom surface of the weight 11 and the other end connected to the lower end of the weight 11, And is connected to an external power source through an upper surface of a lower casing 22.

The linear vibration motor 1 according to the present invention is arranged such that the height of the magnet 23 is located below the center of the upper and lower lengths of the coil section 12, Vibration of the vibrating unit 10 due to smooth up-and-down resonance due to the interaction of the electromagnetic force of a predetermined frequency generated when power is applied to the vibrating unit 12 can be easily performed.

The vibrating unit 10 according to the present invention is formed in a solid shape of a solid body so that a maximum weight can be given in a limited space. The material of the vibrating unit 10 is tungsten Or a tungsten alloy so as to increase the mass of the vibration portion 10 within the same volume to obtain a vibration amount maximized by adjusting the resonance frequency.

The weight 11 as a constituent component of the vibrating unit 10 has an inner portion 14 whose middle outer end portion is bounded by the step 13, A part 12 is installed.

Therefore, the linear vibration motor 1 according to the present invention is located at the outer periphery of the lower end of the internal space region defined by the upper and lower casings 21 and 22 so that the maximum volume of the maximum diameter Since the coil part 12 generating the electromagnetic force is also located on the outer periphery inner side part 14 of the solid weight 11, the maximum volume of the substantially maximum diameter can be obtained Therefore, it is possible to effectively solve the problem that the vibration force, which is a weak point of the coin type linear vibration motor, is relatively weak. In addition, It has the advantage of low battery consumption, the advantage of dimension adjustment, and the quick response time.

A concave surface 15 is formed on the bottom surface region adjacent to the outer periphery of the weight 11 and one end of the FPCB 40 is connected to the concave surface 15.

A recessed portion 21a is formed in the inner peripheral bottom portion of the upper casing 21 and a recessed portion 22a is formed in the upper surface adjacent to the outer peripheral edge of the lower casing 22, The upper and lower cases 21 and 22 can be simply and efficiently attached without any separate fastening means or fastening structure by directly bonding the outer periphery and the bottom face of the magnet 23 to the indentation 21a and the recessed portion 22a, However, it is needless to say that it is possible to jointly use another forced press-fitting structure other than the above-described bonding, if necessary.

Therefore, in the structure of the linear vibration motor 1 according to the present invention, a complicated and time-consuming process such as laser welding or caulking for joining the upper and lower cases 21 and 22 is not required.

In the linear vibration motor 1 according to the present invention, the elastic member holder 21b is sandwiched in a region adjacent to the inner periphery of the upper end of the upper casing 21 in a forced press-fit manner, And a weight holder 17 formed with a plurality of insertion grooves (not shown) in the groove 16 is forcibly press-fitted into the groove 16 so that the elastic member 30 (Not shown) of the weight holder 17 by inserting one end into the space portion between the inner periphery of the upper end of the upper casing 21 and the elastic member holder 21b, So that the structure can be selected.

By employing such an elastic member 30 insertion structure, there is no possibility of occurrence of problems such as thermal deformation and welding defect of the elastic member 30 such as a spring that can occur in laser welding or spot welding, The assembling operation of the member 30 can be carried out simply and efficiently, thereby achieving cost reduction. If necessary, in the linear vibration motor 1 according to the present invention, the outer surface of the weight 11 may be coated with Teflon without the conventional nickel plating. By increasing the insulating property by the surface coating of the fluororesin, It is possible to effectively prevent short-circuiting, leakage, or short-circuit with the part 12 or the FPCB 40, and is also effective in reducing noise.

  In the present invention, the upper casing 21 and the lower casing 22 may be provided with dampers (21c, 22b) made of elastic bodies for reducing noise, respectively. In the illustrated example, The shape and the number of the electrodes 21c and 22b are optional and not limited.

In addition, according to the present invention, since the vibrating portion 10 is suspended by the elastic member 30, it is advantageous in that it is not only quick in vibration response speed but also suitable for imparting a strong vibration force, Since the structure of the yoke 10 is not adopted, it is possible to improve the process efficiency by reducing the number of parts and simplifying the assembling process, and it is also possible to improve the efficiency of the vibration part 10 It is possible to increase the weight.

The dimensions of the linear vibration motor 1 according to the present invention are not limited to the present invention and are optional, but generally speaking, they may have a diameter of 5 to 20 mm and a height of 2 to 6 mm.

In addition, the linear vibration motor 1 according to the present invention can freely adjust the vibration of the incoming call notification signal to various controlled intensities according to the situation by the button control by the user when applied to a mobile device such as a smart phone, In addition, it can effectively prevent mis-calls that can not receive a call because it detects vibrations even if it is in a surrounding environment or put in a handbag or a bag. In addition, By providing the vibration power, it is possible to enjoy a variety of games with more vivid and realistic feelings. In addition to the vibration for simple incoming notification, it can also meet various required vibrations for the interface purpose between the user and the mobile device.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, the invention is not to be limited to the details and various changes and modifications may be suggested to those skilled in the art.

1: Linear vibration motor according to the present invention
10:
11: weight 12: coil part
13: step 14: medial side
15: concave surface 16: groove
17: Weight holder
20:
21: upper casing
21a: indentation portion 21b: elastic member holder
21c: damper
22: Lower casing
22a: Entrance portion 22b: Damper
23: magnet
40: FPCB (Flexible PCB)

Claims (9)

A fixing unit including upper and lower casings, a magnet having a bottom surface bonded to the lower casing and an outer peripheral edge bonded to an inner peripheral bottom of the upper casing;
A vibrating part including a solid body and an integral type weight body and a coil part provided on the outer peripheral edge of the weight body;
An elastic member whose one end is forcibly press-fitted and fixed to the inner periphery of the upper end of the upper casing and the other end is forcibly press-fitted to the upper portion of the weight;
(Flexible Printed Circuit Board) having one end connected to the outer periphery of the bottom surface of the weight body and the other end connected to an external power source through the upper surface of the lower casing.
Linear vibration motor. The linear vibration motor according to claim 1, wherein a height of the magnet is located below the center of the upper and lower lengths of the coil part. 2. The heavy body according to claim 1, wherein a concave surface is formed on a bottom surface adjacent to the outer circumferential edge of the weight body, the inner circumferential edge of the outer circumferential edge of the weight body bounded by the step, Wherein the coil portion is located at the inner side portion and one end of the FPCB is connected to the concave surface. The magnet according to claim 1, wherein an indented portion is formed in an inner peripheral bottom portion of the upper casing to which the outer peripheral edge of the magnet is bonded, and a recessed portion is formed on an upper surface adjacent to the outer peripheral edge of the lower casing to which the bottom surface of the magnet is bonded Wherein the linear vibration motor is provided with a part. The linear vibration motor according to claim 1, wherein the upper casing and the lower casing are each provided with a damper made of an elastic body. [2] The apparatus of claim 1, further comprising: an elastic member holder fitted in an area adjacent to an inner periphery of an upper end of the upper casing, a loop-shaped groove formed in the upper portion of the weight, Wherein one end of the elastic member is forcibly press-fitted and fixed between the inner periphery of the upper end of the upper casing and the elastic member holder, and the other end of the elastic member is inserted and fixed in the weight holder. 7. The linear vibration motor according to claim 6, wherein said elastic member holder and said weight holder are looped. The linear vibration motor according to claim 5, wherein the damper installed in the upper casing and the lower casing is a loop-shaped one.
The linear vibration motor according to claim 1, wherein the outer surface of the weight is Teflon coated.

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