TWI499315B - Micro-speaker - Google Patents

Description

Micro speaker

The present invention relates to a microspeaker, and more particularly to a microspeaker having the following features: a suspension having a central portion that functions as a diaphragm dome, so that the structure is simple, the assembly procedure is reduced, and regenerative power can be obtained. Low resonant frequency (Fo) and wide flat frequency characteristics.

Typically, a speaker is a device that converts an electrical signal into a sound signal. Speakers range from medium to large speakers that are connected to audio or amplifiers to dramatically increase volume, as well as portable audio for smaller audio devices such as cell phones, notebooks, MP3 regenerators, and headsets. Small speaker for the device. Usually, such a small speaker is called a microspeaker.

Hereinafter, the configuration of a conventional micro-speaker having a general structure will be briefly described. In the first figure, a conventional microspeaker 100 is illustrated as a schematic view.

The microspeaker 100 is composed of a frame 110, a yoke 120, a permanent magnet 130, a flat plate 140, a diaphragm 150, a suspension 160, a voice coil 170, and a cover 180.

The frame 110 serves as a member constituting the shape of the microspeaker for mounting other components. The yoke 120, the permanent magnet 130, and the flat plate 140 constitute a magnetic circuit.

The diaphragm 150 is divided into an inner portion 152 and an outer portion 154 with reference to the boundary portion 156. The inner and outer sides and the boundary portion of the diaphragm 150 are all formed integrally. The inner portion 152 is a partially upwardly convex portion shape, also referred to as a dome. The outer portion 154 is a portion that surrounds the inner portion 152 from the outer side. As shown, the outer portion 154 is also slightly upwardly convex.

The inner portion and the outer portion of the diaphragm differ mainly in the reproduction range, respectively. The outer part is made of soft material. It is mainly used to reproduce the sound of the low range when vibrating. The inner part is made of relatively hard material and is mainly used to reproduce the sound of high range.

On the other hand, the outer contour portion of the outer portion 154 is flat, and the outer contour portion thereof is fixed to the frame 110. A cover 180 is attached to the upper portion of the frame 110, and other components are built in.

Further, below the boundary portion 156 of the outer portion and the inner portion, the sound coil 170 is provided with the suspension 160 interposed therebetween. The upper end portion of the voice coil 170 constituted by the wound wire is adhered to the underside of the suspension 160 disposed below the diaphragm 150.

The suspension 160 is disposed to arrange the movement of the diaphragm 150 in the vertical direction. The function of the suspension 160 is to appropriately vibrate the diaphragm 150 only in the vertical direction without moving in the left-right direction. The lower side of the boundary portion 156 of the diaphragm 150 and the suspension 160 are fixed to each other, and the outer contour is also fixed to the frame 110 like a diaphragm.

The intermediate portion of the suspension 160 penetrates in the up and down direction. That is, the suspension 160 located below the inner portion 152 of the diaphragm 150 is hollow. A plurality of long, curved grooves are formed in the suspension 160 at a portion below the outer portion 154 of the diaphragm.

Such a groove is formed in order to allow the suspension 160 to elastically vibrate in the vertical direction. Adjust the width, length and shape of the groove to adjust the spring force of the suspension in the up and down direction.

On the other hand, although not shown in the drawings, in the case of another conventional micro-speaker, the other configurations are the same as those of the conventional technique shown in Fig. 1, but are used without a suspension. . Further, in the case of another conventional speaker, a diaphragm constructed in such a manner that, in order to better present the treble and the bass, the inner portion and the outer portion of the diaphragm are separated to constitute different members, the members are re They are combined with each other to form a diaphragm.

However, in the conventional microspeaker, in the case where the diaphragm is integrally formed, there is a problem in that the elastic force of the outer portion is increased due to the small size of the integrated diaphragm, which limits the regeneration of the low range. That is, due to the limitation of the integrated diaphragm, the high resonance frequency (Fo) and the reproduction range are narrow, and there is a problem that the internal input is low.

In addition, in order to solve such a problem, although some problems can be solved by forming a diaphragm with a thin material, there is still a problem that the top of the diaphragm arch of the integrated structure becomes soft together, and the internal input cannot be received.

This problem solves some of the problems by adopting a diaphragm formed by forming the inner portion and the outer portion into different members, but this configuration also causes the following problem: when a high input is applied to the speaker, the diaphragm is not a The body shape has abnormal sound and high distortion due to the split vibration and the offset vibration of the diaphragm.

Further, when the separator is not formed integrally but is made of a different member, there are the following problems: the number of components is increased, the number of assembly procedures is increased, and the production efficiency of the product is deteriorated, and the cost is increased.

The present invention has been made to solve the above problems, and an object thereof is to manufacture a speaker similar to a conventional one by integrating a portion that acts as a dome (inner portion) of a diaphragm to a suspension, but does not A high-output speaker with a large number of parts and a wide regenerative range and high internal input.

The present invention relates to a microspeaker, comprising: a frame; a magnetic circuit portion comprising a yoke fixed to the frame, a permanent magnet fixed to the yoke, and a flat plate fixed to the permanent magnet; the diaphragm having an edge fixed In the frame, the intermediate portion is formed in a permeable manner; the suspension is located below the diaphragm, the edge of the suspension is fixed to the frame, and is formed by a central portion and a peripheral portion formed integrally with each other; the sound coil is fixed to the suspension The lower surface is fixed to the lower portion of the central portion and the peripheral portion of the peripheral portion; and a cover that is coupled to the frame.

On the other hand, the center portion of the suspension is preferably formed by upwardly projecting through the intermediate through portion of the diaphragm.

On the other hand, the central portion of the suspension is opposed to the intermediate penetrating portion of the diaphragm, and is preferably convex downward.

On the other hand, it is preferable that the center portion of the suspension is provided with at least one ridge formed by a narrow and long shape.

On the other hand, it has a plurality of ridges, and the ridges are preferably spaced apart from each other.

On the other hand, it is preferable that the peripheral portion of the suspension is provided with at least one portion that penetrates in a narrow and long shape, or at least a portion of which is wrinkled.

On the other hand, the suspension is made of polyvinyl chloride (PV), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polyetheretherketone (Polyetheretherketone; PEEK). ), any of Polyimide (PI), Polyetherimide (PEI), Polycarbonate (PC), and Nome Paper (NOMAX), manufactured by thermoforming It is appropriate.

According to the present invention, it is possible to obtain a microspeaker having a resonant frequency (Fo) having a low regenerability and a wide and flat frequency characteristic by providing a suspension in which the center portion is integrally formed.

According to the present invention, it is possible to obtain an effect that a high-output speaker having a high internal input can be produced by functioning as a diaphragm dome portion by a central portion integrally formed on the suspension.

Further, according to the present invention, it is possible to obtain the effect that since the suspension includes the dome portion of the conventional diaphragm and is formed integrally, the number of parts is small, assembly is simple, and assembly cost is reduced.

On the other hand, when the ridge is provided in the center portion of the suspension, the effect of sufficiently securing the rigidity of the center portion can be obtained.

Next, a microspeaker according to an embodiment of the present invention will be described in detail with reference to Figs. 2 to 6 .

The microspeaker 1 of the present embodiment includes a frame 10, a yoke 20, a permanent magnet 30, a flat plate 40, a diaphragm 50, a suspension 60, a voice coil 70, and a cover 80.

The microspeaker 1 is a microspeaker for small audio devices such as mobile phones, earphones, and MP3s. The main feature of the present invention is that the suspension 60 is constructed by integrally forming a portion where the diaphragm dome acts, that is, the center portion is integrally formed.

The frame 10 is usually made of plastic to form the shape of the speaker and to hold various components inside. The lower portion of the frame is combined with the yoke 20 and sealed.

A cover 80 having a plurality of vent holes 82 is joined to the upper end portion of the frame 10. A contour portion that is an edge of the diaphragm 50 and the suspension 60 is fixedly coupled between the upper end portion of the frame 10 and the cover 80. The vent hole 82 of the cover 80 is a configuration for discharging the generated audio to the outside.

The yoke 20 is made of a material having magnetic properties and is fixed to the frame 10.

The permanent magnet 30 is formed of a member 32 having an intermediate circular plate shape and a flat member 34 having a ring shape around it. The permanent magnet 30 is fixed to the bottom surface of the yoke 20. Flat width flat plates 42, 44 corresponding to the corresponding permanent magnets 32, 34 are fixed to the upper surfaces of the permanent magnets 32, 34, respectively. The flat plate 40 is made of a material having magnetic properties, and is composed of an intermediate disc-shaped member 42 and a flat member 44 having a ring shape around it.

Referring to Fig. 4, a space is formed between the permanent magnet 30 and the flat plate 40, and the lower portion of the voice coil 70 is located in the space, and vibrates up and down together with the diaphragm 50 and the suspension 60.

The yoke 20, the permanent magnet 30, and the flat plate 40 constitute a magnetic circuit portion. The magnetic flux generated by the inner permanent magnet 32 is formed through the flat plate 42 and re-enters the magnetic flux path of the yoke 20 via the outer permanent magnet 34 and the flat plate 44.

On the other hand, in the case of the present embodiment, the yoke 20 has a flat plate shape, and the permanent magnet 30 and the flat plate 40 are respectively composed of a disk-shaped member and an annular member on the outer side thereof, but the present invention does not mean Limited to this. In the case of other embodiments, the yoke may have a shape in which a concave receiving groove is provided on the inner side, and the permanent magnet and the flat plate may be in the shape of a circular plate fixed in the receiving groove of the yoke. The permanent magnet and the plate may each be composed of one member.

The intermediate portion of the diaphragm 50 penetrates in the vertical direction. The diaphragm 50 vibrates up and down with the movement of the voice coil 70, generating a sound pressure that can be heard by a person. Typically, diaphragm 50 produces audio in the low range. The separator 50 is made of a polymer compound, and various materials and shapes can be variously modified. The diaphragm 50 can be made of a relatively thin material to enable regeneration of the desired range of audio compared to conventional diaphragms.

The diaphragm 50 of the present embodiment is located outside the boundary portion where the upper end portion of the voice coil 70 is located. The diaphragm 50 has a dome shape, and the boundary portions of the inner side and the outer side are flat.

As long as the diaphragm has a portion penetrating in the vertical direction in the intermediate portion, the other configuration of the diaphragm, the specific shape, the material, and the thickness of the diaphragm used in the microspeaker of the present invention can be variously changed.

The suspension 60 is located below the diaphragm 50. The contour of the suspension 60 is fixed to the frame 10. The suspension 60 is composed of a center portion 62 and a peripheral portion 64. The center portion 62 and the peripheral portion 64 are integrally formed as one member. The intersection portion of the center portion 62 and the peripheral portion 64 is the boundary portion 65. The diaphragm 50 is fixed to the upper side of the boundary portion, and the voice coil 70 is fixed to the lower side.

In the case of the present embodiment, the suspension 60 is formed of a polymer material that can be thermoformed, such as a material such as polyvinyl chloride (PV). The suspension 60 can be manufactured by an injection molding method. In other embodiments, the suspension may be fabricated from the following materials: Polyethylene Naphthalate (PEN), Polyphenylene Sulfide (PPS), Polyetheretherketone (PEEK), Materials which can be produced by a thermoforming method, such as Poly Imide (PI), Polyetherimide (PEI), Polycarbonate (PC), and Nobel (NOMAX).

Further, the suspension 60 of the present embodiment is formed such that a portion where the center portion 62 penetrates through the intermediate portion of the diaphragm 50 is convex upward. The central portion 62 has a shape similar to that of a conventional dome portion.

In the case of this embodiment, the peripheral portion 64 of the suspension 60 is provided with a total of four portions 66 that penetrate in a narrow and long shape. The shape of the through portion 66 is formed symmetrically with respect to the center of the suspension 60. Due to the through portion 66, the suspension 60 can be elastically vibrated in the vertical direction. By adjusting the width, length, and shape of the through portion 66, the elastic force of the suspension 60 in the up and down direction can be adjusted.

On the other hand, the suspension 60 of the present embodiment is in an upwardly convex form, but the present invention is not limited thereto. That is, in the case of other embodiments, although the center portion of the suspension is not shown in the drawings, it may be formed to be convex downward. This case is also the same as the previously proposed embodiment, in which the center portion faces the intermediate penetrating portion of the diaphragm and is located below the through portion.

In the case of this embodiment, the electrical connection portion 90 is provided on one side of the frame 10. The acoustic coil 70 is connected to the electrical connection portion 90, so that an electrical signal of the external electrical device is applied to the acoustic coil 70.

Hereinafter, the action and effect of the microspeaker 1 having this configuration will be described.

The microspeaker 1 of the present embodiment has the following advantages: the diaphragm has only the outer portion, and the intermediate portion has a shape penetrating in the up and down direction. The intermediate convex portion of the diaphragm, that is, the dome portion is integrally formed on the suspension, and thus can have a wide width. Frequency characteristics.

That is, the center of the suspension is mainly responsible for reproducing the high-range audio, and the diaphragm is responsible for reproducing the low-range audio, which makes up for the shortcomings of the audio that cannot be reproduced in the full range due to the formation of the intermediate dome and the surrounding edge. The speaker has a wide frequency characteristic compared to the speaker.

Further, since the suspension integrally forms the center portion, there is an advantage that the number of components does not increase as compared with the conventional one, and therefore the manufacturing cost does not increase due to an increase in components and programs.

In addition, there is an advantage that, according to the present embodiment, a microspeaker having a resonance frequency (Fo) having a low regenerability and a wide flat frequency characteristic can be obtained.

Further, according to the present invention, since the center portion integrally formed on the suspension functions as a dome portion of the diaphragm, it is possible to manufacture a high-output speaker having a high internal input.

On the other hand, Fig. 7 is a plan view showing the deformed suspension 60a, and Fig. 8 is a cross-sectional view taken along line VIII-VIII of Fig. 7. The center portion 62a of the suspension 60a is provided with a ridge 63a which is formed to protrude upward in a narrow and long shape. On the other hand, in the case of other embodiments, the ridge 63a may also be formed to protrude downward.

A total of four ridges 63a are provided, which are spaced apart from each other and arranged side by side. Through the configuration of such a ridge 63a, it is possible to obtain an effect that the center portion 62a can be made more rigid. On the other hand, in the case of other embodiments, the specific shape and number of the ridges can be variously modified.

On the other hand, a perspective view of the deformed suspensions 60b, 60c is shown in Figs. 9 and 10, respectively. The center portions 62b and 62c of the suspensions 60b and 60c are the same as the center portion 62 of the suspension 60 of the first embodiment, but the configurations of the peripheral portions 64b and 64c are deformed.

That is, in the case of Fig. 9, the wrinkle portion which is folded into a zigzag shape is repeatedly formed repeatedly on the peripheral portion 64b. In the case of Fig. 10, the wrinkle portion is formed integrally on the peripheral portion 64c.

In the case of the peripheral portions 64b, 64c of the suspensions 60b, 60c of the ninth and tenth embodiments, the specific shape of the pleated portion can be variously modified, and the desired elastic force can be obtained by such deformation.

On the other hand, the micro-speakers of the above-mentioned embodiments are generally in the form of a cylinder, and the internal structure thereof is also circular, but may be formed into an elliptical shape, a quadrilateral shape other than a circular shape, or a runway like a sports field according to an embodiment. form.

1. . . Micro speaker

10. . . frame

20. . . Yoke

30. . . permanent magnet

32. . . permanent magnet

34. . . permanent magnet

40. . . flat

42. . . flat

44. . . flat

50. . . Diaphragm

60. . . Suspension

60a. . . Suspension

60b. . . Suspension

60c. . . Suspension

62. . . Central department

62a. . . Central department

62b. . . Central department

62c. . . Central department

63a. . . Rib

64. . . Surrounding part

64b. . . Surrounding part

64c. . . Surrounding part

65. . . Boundary part

66. . . Through part

70. . . Sound coil

80. . . cover

82. . . Vent

90. . . Electrical connection

100. . . Micro speaker

110. . . frame

120. . . Yoke

130. . . permanent magnet

140. . . flat

150. . . Diaphragm

152. . . Inner part

154. . . Outer part

156. . . Boundary part

160. . . Suspension

170. . . Sound coil

180. . . cover

Figure 1 is a schematic illustration of a conventional microspeaker.

Fig. 2 is a schematic exploded perspective view of a microspeaker according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional perspective view showing the assembled state of the microspeaker shown in Fig. 2.

Fig. 4 is a schematic cross-sectional view showing the assembled state of the microspeaker shown in Fig. 2.

Fig. 5 and Fig. 6 are a plan view and a side view, respectively, of the suspension shown in Fig. 2.

7 and 8 are a plan view and a side view, respectively, of a suspension used in other embodiments of the present invention.

Fig. 9 and Fig. 10 are perspective views of a suspension used in another embodiment of the present invention, respectively.

1. . . Micro speaker

10. . . frame

20. . . Yoke

30. . . permanent magnet

40. . . flat

50. . . Diaphragm

60. . . Suspension

62. . . Central department

64. . . Surrounding part

66. . . Through part

70. . . Sound coil

80. . . cover

82. . . Vent

90. . . Electrical connection

Claims (7)

A microspeaker comprising: a frame; a magnetic circuit portion comprising a yoke fixed to the frame, a permanent magnet fixed to the yoke, and a flat plate fixed to the permanent magnet; the diaphragm having an edge fixed to the frame, The intermediate portion is formed in a permeable manner; the suspension is located below the diaphragm, and the edge thereof is fixed to the frame, and is formed by a central portion and a peripheral portion which are integrally formed with each other, and the central portion corresponds to the intermediate through portion of the diaphragm And the central portion is formed with at least one protrusion; a voice coil fixed to the underside of the suspension, that is, fixed to the lower portion of the boundary portion of the center portion and the peripheral portion; and a cover coupled to the frame. The microspeaker of claim 1, wherein the central portion of the suspension is formed to protrude upward through the intermediate through portion of the diaphragm. The microspeaker of claim 1, wherein the central portion of the suspension is opposed to the intermediate through portion of the diaphragm and is formed to be convex downward. The microspeaker of claim 1, wherein the central portion of the suspension is provided with at least one ridge formed by a narrow and long shape. The microspeaker of claim 4, wherein the plurality of ridges have a plurality of ridges, and the ridges are spaced apart from each other and side by side. The microspeaker of claim 1, wherein the suspension The peripheral portion has at least one portion that penetrates in a narrow and long shape, or at least a portion of which is in the shape of a wrinkle. The microspeaker of claim 1, wherein the suspension is made of polyvinyl chloride, polyethylene naphthalate, polyphenylene sulfide, polyetheretherketone, polyimine, polyether Any of amine, polycarbonate and Nom paper is produced by a thermoforming process.