WO2012005433A2

WO2012005433A2 - Multi-functional micro speaker

Info

Publication number: WO2012005433A2
Application number: PCT/KR2011/002565
Authority: WO
Inventors: 김규동; 홍진혁
Original assignee: 주식회사 비에스이; 톈진 비에스이 일렉트로닉스 컴퍼니 리미티드; 동관 바오싱 일렉트로닉스 컴퍼니 리미티드; 롱쳉 바오싱 일렉트로닉 컴퍼니 리미티드
Priority date: 2010-07-08
Filing date: 2011-04-12
Publication date: 2012-01-12
Also published as: KR20120005288A; CN202514066U; CN102316401A; WO2012005433A3

Abstract

The present invention relates to a multi-functional micro speaker. The multi-functional micro speaker includes: a frame; a suspension including an edge fixed to the frame, a central portion higher than the edge, and a slope portion connecting the central portion to the edge and having elasticity; a yoke fixed to the upper surface of the central portion of the suspension and including a receiving recess; a weight provided to the periphery of the yoke; a permanent magnet disposed in the receiving recess of the yoke; a plate coupled to the upper surface of the permanent magnet; a vibration plate having an edge fixed to the upper portion of the frame; and a voice coil fixed to the lower surface of the vibration plate.

Description

Multifunction micro speaker

The present invention relates to a multi-function micro speaker, and more particularly, having a suspension formed with a central portion higher than an edge portion, and by placing parts including weights thereon, weight weight can be easily increased to improve vibration force and vibration. A multifunctional micro speaker capable of effectively controlling the variation of frequency.

Generally, a speaker is a device that converts an electrical signal into a voice signal. Micro-speakers are mainly small speakers for small sized audio equipment such as mobile phones, laptops, MP3 players, earphones, etc., and portable audio equipment that is in great demand in recent years.

By the way, the recent electronic products employing a micro speaker, especially a mobile communication device such as a mobile phone is essentially provided with a configuration for generating a vibration signal. In other words, recent mobile communication devices have a configuration for generating a vibration signal that is frequently used instead of an incoming call signal or a vibration signal that confirms an input state in a touch screen method for directly inputting information on a screen. .

The multifunctional micro speaker of the present invention refers to an additional micro speaker having a configuration for generating a vibration signal in an existing micro speaker having a configuration for generating sound. The multifunctional micro speaker is variously called a multifunctional actuator or a multifunctional electro-acoustic transducer.

The multifunctional micro-speaker of the conventional structure is a structure which acquires a vibration by resonating the vibrating body supported by the plate-shaped spring. Such a conventional multifunctional micro speaker has a voice coil in a magnetic circuit on the side of a diaphragm, also called a vibration plate, which generates sound when a current for a voice signal is applied, and generates vibration when a current for a vibration signal is applied to the voice coil. The system is adopted.

A multifunctional micro speaker of a conventional configuration will be described with reference to FIG. The conventional multifunctional micro speaker 100 includes a case 110, a vibration generating plate 101 for sound generation, a voice coil 102, a permanent magnet 104 and a plate 103 in which an N pole and an S pole are disposed in an up and down direction. And a yoke 105, a weight 106, an upper suspension 107, and a lower suspension 108. Current is applied to the voice coil 102 via the lead line a 114 and the lead line b 115.

The voice coil 102 has its upper end fixed to the lower surface of the diaphragm, and extends downward while being wound. The plate 103 is fixed to the upper surface of the permanent magnet 104. The permanent magnet 104 forms a speaker magnetic circuit together with the plate 103 and the yoke 105. The weight 106, also called a mass or weight, constitutes a vibrating body together with the permanent magnet 104, the plate 103, and the yoke 105. The vibrating body is elastically supported by the case 110 by the upper suspension 107 and the lower suspension 108.

When a current is applied to the voice coil 102 of the multifunction micro speaker 100 having the above configuration through the lead wire 114 and the lead wire 115, an electromagnetic force is generated in the voice coil 102 in the magnetic circuit. This causes the diaphragm 101 to vibrate and output sound.

That is, the magnetic force lines from the N pole of the permanent magnet 104 form a magnetic field that passes through the plate 103, the voice coil 102, and the yoke 105 in turn to the S pole of the permanent magnet 104. At this time, when the electromagnetic force is generated in the voice coil 102, it interacts with the magnetic flux by the magnetic circuit, and the diaphragm 101 fixed to the voice coil 104 is vibrated to function as a speaker for outputting sound.

On the other hand, when a low frequency current is applied to the voice coil 102 through the lead wire 114 and the lead wire 115, the weight is applied to the permanent magnet 104, the plate 103, and the yoke 105 constituting the magnetic circuit. Vibration is generated by triggering the up and down motion of the vibrating body further including (106).

The conventional multifunctional micro speaker having the conventional structure described above has a large outer diameter when the weight of the weight is required due to the position of the

suspensions

107 and 108 and the structure in which weights are coupled to them. There is a problem that must be done.

In addition, when the thickness is increased in the vertical direction to increase the weight of the weight, there is a problem in that interference with the diaphragm 101 and the like occurs.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems, and by providing a suspension having a central portion higher than the edge and fixing the edge to the frame, it is easy to increase and adjust the weight weight without increasing the overall outer diameter. Together, the present invention provides a multifunctional micro speaker capable of improving vibration force and effectively controlling the variation of vibration frequency.

In order to achieve the above object, the multi-function micro speaker of the present invention includes a frame: an edge portion fixed to the frame, a center portion positioned higher than the edge portion, and an inclined portion having elasticity connecting the edge portion and the center portion. Suspension provided; A yoke fixed to an upper surface of a central portion of the suspension and provided with a receiving groove; A weight part provided on an outer circumference of the yoke; Permanent magnet provided in the receiving groove of the yoke; A plate coupled to an upper surface of the permanent magnet; And a diaphragm having an edge portion fixed to the upper portion of the frame; and a voice coil fixed to a lower surface of the diaphragm.

On the other hand, it is preferable that the edge portion of the suspension is substantially circular in its outer shape, the center portion is flat, and the inclined portion has a plurality of penetrating portions formed along the circumferential direction.

On the other hand, it is preferable that the external shape formed by the said suspension is substantially the shape of a truncated cone.

The frame may include a lower frame in which the suspension is fixed, an intermediate frame in which the diaphragm is fixed, and a cover frame covering the diaphragm.

On the other hand, the yoke and the weight portion is preferably formed integrally.

On the other hand, the permanent magnet is located above the center of the suspension, the weight portion is preferably located above the inclined portion of the suspension.

According to the multifunctional micro-speaker according to the present invention, it is possible to obtain the effect that the weight weight can be increased without interference with other components.

In addition, it is easy to increase and adjust the weight weight, it is possible to obtain the effect of improving the vibration force and effectively control the variation of the vibration frequency.

1 is a schematic cross-sectional view of a conventional multifunctional micro speaker,

2 is a schematic exploded perspective view of a multifunctional micro speaker of an embodiment according to the present invention;

3 is a schematic cross-sectional view of the assembled state of the multi-function micro-speaker of FIG.

1 ... multi-function micro speaker 10 ... frame

20 ... suspension 22 ... rim

24 ... center 26 ... slope

30 ... York 40 ,,, weight part

50 ... permanent magnet 60 ... plate

70 ... diaphragm 80 ... voice coil

The multifunction micro speaker of one embodiment according to the present invention will be described in detail with reference to FIGS. 2 and 3.

2 is a schematic cross-sectional view of a multifunction micro speaker of an embodiment according to the present invention, and FIG. 3 is a schematic exploded perspective view of the multifunction micro speaker of FIG. 2.

The multifunctional micro speaker 1 of this embodiment is mainly used in a mobile communication terminal such as a mobile phone and a small device such as a PMP, and has a sound generating function and a vibration generating function as a signal at the same time.

The multifunction micro speaker 1 includes a frame 10, a suspension 20, a yoke 30, a weight 40, a permanent magnet 50, a plate 60, a diaphragm 70, and a voice. It comprises a coil (80).

The frame 10 is usually made of plastic, and forms various external components of the speaker and is fixed therein. In the present embodiment, the frame 10 has a flat cylindrical shape as a whole.

In the present embodiment, the frame 10 is composed of a lower frame 12, an intermediate frame 14, and a cover frame 16. However, in the case of another embodiment, the intermediate frame 14 and the lower frame 12 may be integrally formed as necessary.

The edge portion 22 of the suspension 20 is fixed to the inner bottom surface of the lower frame 12. The edge portion 72 of the diaphragm 70 is fixed to the intermediate frame 14. The intermediate frame 14 is provided with a pair of terminals 15. The voice coil 80 is electrically connected to the terminal 15. An external electric wire is connected to the terminal 15, and an external electric signal is transmitted to the voice coil 80.

The cover frame 16 is a shape covering the outside of the diaphragm 70 as a whole, and is coupled to the outer edge of the intermediate frame 14. The outer circumferential portion of the diaphragm 70 is sandwiched between the outer circumferential portion of the cover frame 16 and the outer circumferential portion of the intermediate frame 14.

The suspension 20 is provided below the inside of the frame 10. The suspension 20 consists of an edge portion 22, a central portion 24, and an inclined portion 26.

The edge portion 22 is fixed to the inner bottom surface of the lower frame 22. In the case of this embodiment, the outer shape of the edge portion 22 is substantially circular. Substantially, circular means not a mathematically perfect circle, but a shape that is usually seen as a circle. On the other hand, in the case of other embodiments, the edge portion may be a variety of shapes, such as oval or track shape, as well as a circular shape, or may be a shape such as a quadrangular corner portion arced as necessary.

The central portion 24 is located higher than the position of the edge portion 22. The central portion 24 is flat. The shape of the central portion 24 is substantially the shape of a circle. In addition, the edge portion 22 and the central portion 24 provided to have a height difference are connected to each other by the inclination portion 26.

The inclined portion 26 is an elastic member. In this case, the term 'elasticity' refers to a property of changing volume and shape when an external force is applied to the object, and then returning to the shape of Bondi by removing the force. Can be divided. In the case of the present invention, the inclined portion 26 is mainly related to the shape elasticity.

Therefore, the yoke 30 fixed to the upper surface of the center part 24 is elastically supported by the suspension 20. In the present embodiment, the inclined portion 26 is provided with a plurality of through portions 28 formed long in the circumferential direction. By adjusting the shape of the penetrating portion 28, it is possible to adjust the elastic force for supporting the fixed yoke 30, etc. of the central portion (24).

In the present embodiment, the edge portion 22, the central portion 24 and the inclined portion 26 are formed of an integral member. Therefore, not only the inclination part 26, but also the edge part 22 and the center part 24 are members which carried elasticity.

On the other hand, in the case of other embodiments, the edge portion, the central portion, the inclined portion may be formed as a separate member, respectively, instead of being integrally formed as necessary, may be configured to be combined with each other, or any two members and one member is a separate member It may be configured to be combined with each other.

In the case of the present embodiment, when the suspension 20 is viewed as a whole, its outer contour is similar to the shape of the truncated cone, where the top is removed from the cone. Components such as the yoke 30 fixed to the upper surface of the central portion 26 are elastically supported by the suspension 20, as if supported on the upper end of the coil-shaped spring, and is input to the voice coil 80. It vibrates according to the signal.

The yoke 30 is fixed to the upper surface of the central portion 24 of the suspension 20. The inside of the yoke 30 is provided with a recessed receiving groove (32). The yoke 30 is made of a magnetically permeable material.

The weight portion 40 is provided on the outer circumferential portion of the yoke 30. The weight portion 40 may also be called a weight, mass, weight, or the like. By adjusting the weight of the weight 40, the degree of vibration of the yoke 30 or the like can be adjusted.

In this embodiment, the weight portion 40 is formed integrally with the yoke 30. However, in another embodiment, the weight portion may be manufactured as a member separate from the yoke and coupled to the outer circumference of the yoke. In addition, the weight portion may be formed by combining two or more members.

The permanent magnet 50 is formed in a disc shape so as to correspond to the receiving groove 32 of the yoke 30. The permanent magnet 50 is fixed to the inner bottom surface of the yoke 30.

The plate 60 has a diameter substantially the same as that of the permanent magnet 50 and is fixed to the upper surface of the permanent magnet 50. Plate 60 is made of a material that allows magnetic force to pass through.

The permanent magnet 50 and the plate 60 are fixed to be spaced apart from the inner wall of the yoke 30. A space is formed between the outer surface of the permanent magnet 50 and the plate 60 and the inner wall of the yoke 30, and the lower portion of the voice coil 80 is located in this space.

On the other hand, the permanent magnet 50, the plate 60 and the yoke 30 constitute a speaker magnetic circuit. That is, the magnetic flux generated in the permanent magnet 50 creates a magnetic flux path (path) entering the yoke 30 via the plate 60.

The diaphragm 70 vibrates up and down to produce a sound pressure that can be heard by a person. The edge portion 72 of the diaphragm 70 is fixed to the frame 10 as described above. The diaphragm 70 is usually made of a high molecular compound.

The diaphragm 70 of this embodiment is divided into an inner portion 74 located inside and an outer portion 76 located outside based on a boundary portion where the upper end of the voice coil 80 is coupled. The inner portion 74 and the outer portion 76 each have a dome shape, and the boundary portion is flat. The diaphragm 70 can be variously changed in specific shape, material, and thickness.

The voice coil 80 is fixed to the lower surface of the diaphragm 70. The upper end of the voice coil 80 is fixed to the lower surface of the boundary of the diaphragm 70. The voice coil 80 is formed by winding a conductive wire in an upward direction. The voice coil 80 is electrically connected to the terminal 15 provided in the frame 10. The voice coil 80 receives a current from the outside through the terminal 15.

The lower portion of the voice coil 80 is located in the space between the permanent magnet 50 and the plate 60 and the yoke 30. When a high frequency current flows through the voice coil 80, the magnetic coil is moved upward and downward due to a mutual relationship with the magnetic field generated by the permanent magnet 50. As a result, the diaphragm 70 coupled to the voice coil 80 vibrates to generate sound.

Hereinafter, the operation and effects of the multifunctional micro speaker 1 having the above-described configuration will be described.

The multifunction micro speaker 1 of the present embodiment has a suspension having a shape in which a center portion 24 is higher than an edge portion 22, and the center portion 24 and the edge portion 22 are connected to an inclined portion 26 having elasticity ( 20), by placing the yoke 30, the permanent magnet 50, the plate 60 and the weight 40 in the upper portion of the suspension 20, the weight 40 is interfered with other components The effect is that it is possible to increase the weight without.

That is, the yoke 30 is fixed to the central part 24 of the suspension 20, and the weight part 40 is provided in the outer peripheral part of the yoke 20. Accordingly, the weight portion 40 is positioned above the inclined portion 26 of the suspension 20, but is spaced apart from the inclined portion 26. For this reason, the weight part 40 has the effect that it is possible to increase a weight by increasing a volume down toward the inclination part 26, even if it does not increase the diameter. As a result, it is possible to increase the weight of the weight portion 40 without increasing the outer diameter of the micro speaker and without causing interference with other components.

Since it is easy to adjust the weight of the weight part 40, it is possible to obtain the effect that it is possible to effectively control the vibration force improvement and the variation of the vibration frequency.

Claims

frame:

A suspension having an edge fixed to the frame, a central portion positioned higher than the edge portion, and an inclined portion connecting the edge portion and the central portion with elasticity;

A yoke fixed to an upper surface of a central portion of the suspension and provided with a receiving groove;

A weight part provided on an outer circumference of the yoke;

Permanent magnet provided in the receiving groove of the yoke;

A plate coupled to an upper surface of the permanent magnet;

A diaphragm having an edge portion fixed to an upper portion of the frame; and

And a voice coil fixed to the lower surface of the diaphragm.
The method of claim 1,

The edge portion of the suspension is substantially circular in its outer shape,

The center is flat,

And the inclined portion includes a plurality of through portions elongated in the circumferential direction.
The method of claim 1,

The external shape formed by the suspension is a multi-functional micro speaker, characterized in that the shape of the truncated cone.
The method of claim 1,

The frame, the multi-function micro speaker comprising a lower frame fixed to the suspension, an intermediate frame fixed to the diaphragm, and a cover frame covering the diaphragm.
The method of claim 1,

The yoke and the weight portion are integrally formed, or two or more members are formed by combining two or more members.
The method of claim 1,

The permanent magnet is located above the center of the suspension,

The weight part, the multi-function micro speaker, characterized in that located above the inclined portion of the suspension.