KR101648943B1

KR101648943B1 - Speaker

Info

Publication number: KR101648943B1
Application number: KR1020150041008A
Authority: KR
Inventors: 김준환; 이춘희
Original assignee: 주식회사 엠소닉
Priority date: 2015-03-24
Filing date: 2015-03-24
Publication date: 2016-08-17

Abstract

The present invention relates to a speaker.
A speaker according to the present invention has a structure for vibrating a diaphragm by a plurality of acoustic coils and a suspension for inputting an electrical signal to a plurality of acoustic coils, wherein the suspension includes a plurality of acoustic coils, And has a position retaining portion for retaining it.
According to the present invention, since the position of the attaching portion can be properly maintained, the workability is improved and the defect rate can be reduced.

Description

Speaker {SPEAKER}

The present invention relates to a flat speaker having a plurality of acoustic coils.

Innovative development of display implementation technology is leading to the spread of very thin display devices. Typical examples of the display device include a television receiver and a computer monitor.

However, in spite of high technical achievement of the screen realization technology, a display device which outputs sound like a television receiver has a limitation in making its thickness thinner due to the restriction due to the thickness of the speaker.

Generally, a dynamic speaker is applied because a high-frequency sound or a bass sound should be outputted evenly on a television receiver.

Since a dynamic speaker requires a vibration distance of an acoustic coil, securing such a vibration distance is a limiting factor in reducing the thickness of the display device.

Therefore, many attempts have been made to reduce the thickness of the speaker while maintaining the acoustic output. Through these attempts, Korean Patent Laid-Open No. 10-2201-0011199 (hereinafter referred to as "prior art") has been proposed.

The prior art is implemented to input electrical signals to three acoustic coils through a metal suspension, and the suspension is implemented to provide restoring force when the diaphragm vibrates. Such a suspension requires a plurality of acoustical coils to input an electrical signal, but the length of the suspension is long because the acoustical coils must be maintained in an interlocked state. Therefore, the following problems occur when assembling the speaker.

The suspension is attached to a diaphragm and a housing (conventionally referred to as a frame).

However, as shown in the exaggerated view of FIG. 1, due to lengthening and lengthening of the lid due to its long length, the attaching portion attached to the acoustic coil is displaced from the correct position. When the attaching portion is bonded to the diaphragm or the housing in this state, The loudspeaker coil will be out of position. If the acoustic coil is out of position due to the nature of the speaker, where symmetry is very important, the defective product will eventually be mass-produced.

Therefore, the defective rate is very high at the time of mass production of the product according to the conventional art.

It is an object of the present invention to provide a technique for solving the above-mentioned problems, in which the attachment portion to which the acoustic coils are attached can be held in position with respect to the diaphragm or the housing.

According to an aspect of the present invention, there is provided a speaker comprising: a first permanent magnet generating a magnetic field; A second permanent magnet spaced apart from the first permanent magnet by a predetermined distance and generating a magnetic field; A first acoustic coil that vibrates by generating a magnetic field that interferes with a magnetic field of the first permanent magnet according to an input electrical signal; A second acoustic coil that vibrates by generating a magnetic field that interferes with a magnetic field of the second permanent magnet according to an input electrical signal; A housing having a receiving space capable of receiving the first permanent magnet and the second permanent magnet so as to be spaced apart from each other; A diaphragm for generating sound while vibrating together with the vibrations of the first acoustic coil and the second acoustic coil and having an edge fixed to the housing; A first suspension and a second suspension which are made of a conductive material for inputting electrical signals to the first acoustic coil and the second acoustic coil and are electrically isolated from each other and provide restoring force to the diaphragm; Wherein the first suspension includes: a first fixing part fixed to one side of the housing; A second fixing part fixed to the other end of the housing; A first attaching portion to which a part of an upper end of the first acoustic coil is attached; A second attaching portion spaced apart from the first attaching portion by a predetermined distance and to which a part of an upper end of the second acoustic coil is attached; And a second holding portion for holding the position of the first mounting portion and the second mounting portion with respect to at least any one of the diaphragm or the housing in at least a part of the interval between the first mounting portion and the second mounting portion, And at least the upper surfaces of the first attachment portion and the second attachment portion are attached to the diaphragm.

And the width of the position maintaining portion is wider than that of the other sections except for the partial section.

Wherein the interlocking groove is formed in the position maintaining portion so as to reinforce interlocking between the first acoustic coil and the second acoustic coil, and the interlocking groove is formed in a plane on the center of the first acoustic coil and the center of the second acoustic coil In the direction parallel to the center line connecting the center lines.

It is preferable that the position maintaining portion includes a point where the center line connecting the center of the first acoustic coil and the center of the second acoustic coil on the plane intersects the connecting portion.

Preferably, the position connecting portion is symmetrical with respect to the zigzag line.

According to the present invention, since the positions of the first attachment portion and the second attachment portion can be maintained at the same position with respect to the diaphragm or the housing, the assembling property and the defective rate can be reduced.

1 is an exaggerated view for explaining a problem with a conventional suspension.
2 is an exploded perspective view of a speaker according to a first embodiment of the present invention.
FIG. 3 is a plan view of a diaphragm applied to the speaker of FIG. 2. FIG.
4 is a plan view of the first and second suspensions applied to the speaker of FIG. 2;

The preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, in which the technical parts already known will be omitted or compressed for simplicity of explanation.

2 is an exploded perspective view of a speaker 200 according to an embodiment of the present invention.

2, the speaker 200 according to the present embodiment includes a first permanent magnet 211, a first yoke 221, a first plate 231, a second permanent magnet 212, A first acoustic coil 241, a second acoustic coil 242, a housing 250, a diaphragm 260, a first suspension 271, and a second suspension (not shown) 272).

The first permanent magnet 211 generates a magnetic field and is attached to the bottom surface of the first yoke 221 with its bottom surface being accommodated in the first yoke 221. Here, between the outer surface of the first permanent magnet 211 and the inner surface of the first yoke 221, a vibration interval at which the first acoustic coil 241 can vibrate is secured.

The first yoke 221 has a storage space RS for storing the first permanent magnet 211 and is formed of a magnetic material.

The first plate 231 is attached to the upper surface of the first permanent magnet 211 and is made of a magnetic material.

The first permanent magnet 211, the first yoke 221 and the first plate 231 constitute a first magnetic circuit for vibrating the first acoustic coil 241.

The second permanent magnet 212 generates a magnetic field and is attached to the bottom surface of the second yoke 222 with the bottom surface being accommodated in the second yoke 222. Here, between the outer surface of the second permanent magnet 212 and the inner surface of the second yoke 222, a vibration interval at which the second acoustic coil 242 can vibrate is secured. The second permanent magnets 212 are separated from the first permanent magnets 211 by a predetermined distance.

The second yoke 222 has a storage space RS for storing the second permanent magnet 212 and is formed of a magnetic material.

The second plate 232 is attached to the upper surface of the second permanent magnet 212 and is made of a magnetic material.

The second permanent magnet 212, the second yoke 221 and the second plate 232 constitute a second magnetic circuit for vibrating the second acoustic coil 242. [

The first acoustical coil 241 vibrates by generating a magnetic field that interferes with the magnetic field of the first permanent magnet 211 according to an input electrical signal.

The second acoustic coil 242 vibrates by generating a magnetic field that interferes with the magnetic field of the second permanent magnet 212 in accordance with the input electrical signal.

The housing 250 has a receiving space ES capable of accommodating a first magnetic circuit including the first permanent magnet 211 and a second magnetic circuit including the second permanent magnet 213.

The diaphragm 260 vibrates together with the vibration of the first acoustic coil 241 and the second acoustic coil 242 to generate sound. This diaphragm 260 has a ring-shaped rim portion 261, a ring-shaped edge portion 262 and a vibration portion 263 as shown in Fig.

The rim portion 261 is fixed to the housing 250.

The edge portion 262 is connected to the inside of the rim portion 261 at its outer side and connected to the vibrating portion 263 at its inner side.

The vibrating part 263 is attached to the edge part 262 in conjunction with the first acoustic coil 241 and the second acoustic coil 242 to output sound while vibrating.

The first suspension 271 and the second suspension 272 are formed of a metal thin plate having a resilient restoring force while being made of a conductive material for inputting electrical signals to the first acoustic coil 241 and the second acoustic coil 242. The first suspension 271 and the second suspension 272 are electrically separated from each other. The first suspension 271 and the second suspension 272 have spring functions to provide restoring force to the diaphragm 260. 4, the first suspension 271 includes a first fixing portion 271a, a second fixing portion 271a ', a first mounting portion 271b, a second mounting portion 271b ') And a connecting portion 271c.

The first fixing portion 271a extends outward (left in the figure) of the accommodation space ES and is fixed to one end (left end in the figure) of the housing 250. [ The first fixing portion 271a also functions as a terminal connected to a first signal line (not shown) for supplying an electric signal.

The second fixing portion 271a 'extends outside the other side of the accommodation space (right side in the figure) and is fixed to the other side end (right end in the figure) of the housing 250. [ Similarly, the second fixing portion 271a 'also functions as a terminal connected to a second signal line (not shown) for supplying an electric signal.

The first attachment portion 271b has substantially the same shape as the plane of the first acoustic coil 241 and a part (approximately half) of the upper end of the first acoustic coil 241 is attached to the bottom face thereof. The upper surface of the first attachment portion 271b is attached to the bottom surface of the vibration portion 263 formed in the vibration plate 260. [

The second attachment portion 271b 'is spaced apart from the first attachment portion 271b by a predetermined distance, and is substantially the same as the plane of the second acoustic coil 242. (Approximately half) of the upper end of the second acoustic coil 242 is attached to the bottom surface of the second attachment portion 271b 'and the upper surface of the second attachment portion 271b' (Not shown).

The connection portion 271c electrically connects the first attachment portion 271b and the second attachment portion 271b '. The connection portion 271 is provided at a certain position to hold the first attachment portion 271b and the second attachment portion 271b 'relative to at least any one of the diaphragm 260 and the housing 250, (PMP).

The position maintaining portion PMP includes a center O of the first acoustic coil 241 attached to the first attachment portion 271b and a second acoustic coil 242 attached to the second attachment portion 271b ' The width W ₁ is extended in the direction perpendicular to the center line CL connecting the center O ' That is, in a direction normal to the location holding portion center line by (PMP) is having a partial section width of the other region except for the (W ₂₎ than the larger width in the direction perpendicular to the center line _{(CL) (W 1) (} CL) . Therefore, the position maintaining portion PMP ultimately maintains the positions of the first attachment portion 271b and the second attachment portion 271b 'connected to the connection portion 271c. This position maintaining portion PMP includes a point P at which the dividing line PL dividing the center line CL in the vertical direction meets the connecting portion 271C so that the mass distribution can be made the same, PL) are preferably symmetrical.

An interlocking groove WS is formed in the position maintaining portion PMP in a direction parallel to the center line CL. The interlocking groove WS prevents the coupling portion 271c from being bent in the direction in which the first voice coil 241 and the second voice coil 242 vibrate so that the first voice coil 241 and the second voice coil 242, .

The first holding portion 271b and the second holding portion 271b 'connected to the connecting portion 271c are prevented from being displaced in a predetermined direction So that it can be attached to the diaphragm 260. Therefore, the first voice coil 241 and the second voice coil 242 attached to the first attachment portion 271b and the second attachment portion 271b 'can be maintained in the same position. That is, since the strength of the connecting portion 271c is reinforced in the direction of the dividing line PL, it is possible to prevent the first attachment portion 271b and the second attachment portion 271b ' It can be.

The second suspension 272 is mechanically separated from the first suspension 271 by a mechanism and electrically symmetrical with respect to the center line CL on the center line CL. Therefore, the description of the second suspension 272 is replaced with the description of the first suspension 271 above.

Of course, the above embodiments are described by way of example in which there are two attachment portions, but the present invention can be preferably applied even when there are three or more attachment portions as in the prior art.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And the scope of the present invention is to be understood as the scope of the following claims and their equivalents.

200: Speaker
211: first permanent magnet
212: second permanent magnet
241: first acoustic coil
242: second acoustic coil
250: Housing
260: diaphragm
271: 1st suspension
271a: first fixing portion 271a ': second fixing portion
271b: first attachment portion 271b ': second attachment portion
271c:
PMP: Position retaining part WS: Reinforcing groove
O: center of first acoustic coil O ': center of second acoustic coil
CL: center line PP:

Claims

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A first permanent magnet generating a magnetic field;
A second permanent magnet spaced apart from the first permanent magnet by a predetermined distance and generating a magnetic field;
A first acoustic coil that vibrates by generating a magnetic field that interferes with a magnetic field of the first permanent magnet according to an input electrical signal;
A second acoustic coil that vibrates by generating a magnetic field that interferes with a magnetic field of the second permanent magnet according to an input electrical signal;
A housing having a receiving space capable of receiving the first permanent magnet and the second permanent magnet so as to be spaced apart from each other;
A diaphragm for generating sound while vibrating together with the vibrations of the first acoustic coil and the second acoustic coil and having an edge fixed to the housing;
A first suspension and a second suspension which are made of a conductive material for inputting electrical signals to the first acoustic coil and the second acoustic coil and are electrically isolated from each other and provide restoring force to the diaphragm; / RTI >
The first suspension includes:
A first fixing part fixed to one end of the housing;
A second fixing part fixed to the other end of the housing;
A first attaching portion to which a part of an upper end of the first acoustic coil is attached;
A second attaching portion spaced apart from the first attaching portion by a predetermined distance and to which a part of an upper end of the second acoustic coil is attached; And
A connection part electrically connecting the first attachment part and the second attachment part; / RTI >
Wherein the connection portion has a position maintaining portion for maintaining the positions of the first attachment portion and the second attachment portion with respect to at least any one of the diaphragm or the housing in at least a portion thereof,
At least the upper surfaces of the first attachment portion and the second attachment portion are attached to the diaphragm,
Wherein the position maintaining portion has a width that is wider than another portion excluding the partial portion,
Wherein the position maintaining portion is formed with an interlocking groove for reinforcing interlocking between the first acoustic coil and the second acoustic coil,
Wherein the interlocking groove is elongated in a plane parallel to a center line connecting the center of the first acoustic coil and the center of the second acoustic coil
speaker.

The method of claim 3,
Characterized in that the position holding portion includes a point at which a line that divides the center line connecting the center of the first acoustic coil and the center of the second acoustic coil in a plane perpendicularly bisects the connecting portion
speaker.

5. The method of claim 4,
Wherein the position maintaining portion is symmetrical with respect to the zigzag line
speaker.