KR20190139498A - Diaphragm assembly and speaker assembly having the same - Google Patents

Abstract

According to the present invention, a vibration plate assembly comprises: a vibration surface using a planar vibration plate, used in a rectangular speaker assembly having the length of a long axial direction to be at least three times longer than that of a short axial direction, and including the vibration plate for generating sound pressure by vibration and an edge for connecting the vibration plate and a fixed end, wherein the vibration plate has an edge portion; extension parts formed by extending outwardly from at least a portion of the edge portion near both ends of a long axis of the vibration surface, and having ends thereof not fixed to the fixed end; and viscoelastic bodies separately coupled to a lower surface near both ends of the long axis of the vibration surface. The edge includes: an inner fixing part fixed to the edge portion of the vibration plate; an outer fixing part fixed to the fixing end; and a connection part for connecting the inner fixing part and the outer fixing part.

Description

DIABHRAGM ASSEMBLY AND SPEAKER ASSEMBLY HAVING THE SAME

 The present invention relates to a speaker assembly, and more particularly, to a speaker assembly that can alleviate the split vibration of both ends of the diaphragm using a diaphragm assembly including a viscoelastic material.

The speaker assembly used as a component of an image device such as a TV and a monitor has a rectangular shape having a narrow width and a long length so as to be embedded in one side of the display. Typically the length of the speaker assembly is formed at least three times its width. Unlike a circular diaphragm having a small number of vibration problems, the diaphragm 31 of the rectangular speaker assembly 30 suffers from severe degradation of acoustic characteristics due to split vibrations at both ends of the long axis direction. Fig. 29 shows a conventional rectangular speaker used in an imaging apparatus, and Japanese Patent Laid-Open No. 1989-269396 "Speaker" of Matsushita discloses a conventional rectangular speaker structure. The diaphragm 31 of the conventional speaker assembly 30 adopts a cone diaphragm 31 having a high rigidity to alleviate the split vibrations at both ends in the long axis direction.

The conventional speaker assembly using the cone diaphragm 31 to distinguish it from a "slim speaker" using a flat diaphragm described below is commonly referred to as a "general speaker". The cone diaphragm 31 has the advantage of high rigidity, but has a problem of high speaker assembly 30 due to the conical shape. The typical general speaker 30 has a large size of 120 mm or more in length L, 30 mm or more in width W, and 30 mm or more in height. Therefore, the general speaker 30 is not suitable for a video device such as a flat panel TV that pursues a beautiful design.

Accordingly, there has been an attempt to miniaturize the speaker assembly by using a flat diaphragm rather than the cone diaphragm 31. However, the flat diaphragm has a problem in that the split vibration of both ends in the long axis direction is further increased since the diaphragm rigidity is inferior to that of the cone diaphragm 31. In order to solve this problem, a method of enlarging the size of the drive system composed of the voice coil and the magnetic circuit and a method of increasing the drive coefficient have been proposed.

The diaphragm applied to Panasonic Japanese Unexamined Patent Publication No. 1997-200891 "Speaker" and Panasonic Japanese Unexamined Patent Publication No. 4590403 "Speaker" and Korean Topton Korean Patent Publication No. 10-0665530 "Rectangle Slim Speaker" Having a diaphragm "discloses a speaker assembly in which an extremely enlarged drive system drives a planar diaphragm. According to this structure, the driving force is directly transmitted to both ends of the long axis direction of the diaphragm, thereby reducing the divided vibration. However, first, due to the increase in the size of the voice coil, the mass of the vibration system is heavy, there is a problem that the speaker efficiency is lowered. Second, as the size of the magnet increases, the manufacturing cost of the speaker assembly increases, which lowers the price competitiveness. In particular, the speaker assemblies used in the imaging device are traded at a low price of $ 0.5 to $ 1.5 per unit, and the price of the magnet parts accounts for about 30% of the manufacturing cost. Severely degrades.

Korean Electronic Utility Model Publication No. 20-1989-0001812 by Samsung Electronics, "Frame integrated multi-magnetic circuit speaker", Japanese Laid-Open Patent Publication No. 1989-027399 "Square Plane Speaker" and Panasonic Japanese Patent Publication No. 3613881 "Speaker" discloses a speaker assembly in which a plurality of drives drive a planar diaphragm. According to this structure, since the driving systems are located at positions adjacent to both ends in the diaphragm long axis direction, there is an effect of alleviating the divided vibration. However, there is a problem of using a corrugated damper 32 of a conventional fabric material to provide a restoring force to the diaphragm. Since the corrugated damper 32 penetrates through the voice coil, there is a problem that the length of the bobbin is increased to avoid the interference between the magnetic circuit, the damper, and the diaphragm, thereby increasing the height of the speaker assembly.

Japanese Unexamined Patent Publication No. 1998-327491, "Speaker" by Kenwood, Korean Patent Publication No. 10-2010-0011199 by Jin Young G & T, "Rectangle Thin Film Speaker" and Korean Patent Publication No. 10-0963559 "Bumjin ID" Slim speaker "discloses a slim speaker structure using a planar suspension. The planar suspension is directly coupled to the bottom of the flat diaphragm and coupled to the top of the bobbin without penetrating the bobbin, thereby reducing the height of the speaker assembly. For example, one type of slim speaker using commercially available flat diaphragms and flat suspensions has a compact size of 85 mm in length (L), 18 mm in width (W) and 13 mm in height.

On the other hand, by adopting a three-dimensional rigid reinforcement structure of the convex shape as a method of reinforcing the rigidity of the flat diaphragm weaker than the cone diaphragm, the split vibration can be alleviated somewhat. In addition, an expensive neodymium magnet is used instead of a low-cost ferrite magnet 33 used in the general speaker 30 to transmit sufficient driving force to the diaphragm as a small magnet.

However, neodymium magnets have an advantage of providing higher magnetic force than ferrite magnets, but have a disadvantage in that demagnetizaion occurs in a high temperature environment due to a lower Curie Temperature than ferrite magnets. In addition, neodymium magnets have a problem of high price volatility and high price volatility using rare earth elements as raw materials. Indeed, due to China's limited rare earth exports in 2011, the price of neodymium magnets soared 11 times in the short term. Therefore, a conventional slim speaker using a plurality of neodymium magnets has a problem of high price and high price volatility.

In addition, since the conventional slim speaker uses a plurality of drive systems, the number of voice coils, bobbins, plates, and yokes increases as well as magnets, resulting in high manufacturing costs, complicated manufacturing processes, and high manufacturing costs. .

Lastly, in the conventional slim speaker using a plurality of voice coils, since a plurality of driving systems transmit driving power to a single diaphragm, there is a problem that sound distortion occurs due to interference between vibrations.

Due to these problems, the general speaker 30 as a component speaker of the imaging device is still used mainly, and the slim speaker is limited to being used only for an expensive imaging device in which a beautiful design is important.

Therefore, there is a need for the development of a new single drive system slim speaker having a compact size and a high cost competitiveness while having the same compact size as a conventional multi drive system slim speaker. Three technical problems exist to implement a single driveline slim speaker without increasing the size of the driveline. The first is a low sound pressure level (SPL), the second is a split vibration problem at both ends of the long axis, and the third is a potato problem due to high heat generation.

In a single drive system, the driving force is concentrated in the center of the diaphragm, so that it is difficult to drive the entire diaphragm area. In general, the diaphragm is a rigid body, and ideally, the entire diaphragm vibrates with a piston. However, in a single drive system environment in which driving force is concentrated in the center of the low rigid rectangular flat diaphragm, sufficient vibration energy is not transmitted to both ends of the diaphragm far from the vibration source. Therefore, there is a problem that the vibration displacement of the diaphragm is insufficient and the overall sound pressure level falls or the sound pressure level is uneven.

In order to overcome this problem, the diaphragm of single drive system slim speaker has high stiffness in the center area adjacent to the vibration source to minimize vibration energy loss, and relatively low stiffness at both ends away from the vibration source. It is configured to secure one vibration displacement. Korean Patent Publication No. 10-1560365 of Slivis Co., Ltd. "Diameter of Speaker Device" has a height of a concave portion formed at the center of the diaphragm increasing from the center to both ends, and a height of the convex portion formed adjacent to the concave portion is both ends at the center. The structure is lowered toward the start. According to the diaphragm structure, since the center portion has high rigidity and both ends have relatively low rigidity, the sound pressure level of the single drive system slim speaker can be increased.

However, according to this structure, since the stiffness of both ends of the diaphragm is relatively low, the influence of the split vibration including the torsional vibration in the corresponding region is increased, thereby causing a dip problem in which the sound pressure level is locally dropped in a specific region. Therefore, there is a need for a structure capable of effectively suppressing torsional vibrations at both ends of the diaphragm. Korean Patent Publication No. 10-2016-0089264 "Vibration Plate Assembly" and Korean Patent Publication No. 10-1564896 "Vibration Plate Assembly" of Sleevis Co., Ltd. disclose a vibration plate having extensions at both ends in the long axis direction. According to the diaphragm structure, the extension part can provide additional restoring force at both ends of the diaphragm and suppress the torsion, thereby alleviating the effect of the split vibration of the single drive system slim speaker.

Korean Patent Publication No. 10-1737813 to "Slibis Co., Ltd." discloses a diaphragm coated with a viscoelastic material between an extension and an edge added to both ends. According to this connection structure, the viscoelastic material applied to the diaphragm extension portion can effectively absorb the split vibration including torsional vibration, thereby further alleviating the split vibration effect of the single drive system slim speaker.

Next, the single drive system slim speaker is more susceptible to heat generation than the multiple drive system slim speaker. For example, in the conventional multi-drive type slim speaker in which two voice coils are connected in parallel, the thermal resistance is distributed to each voice coil so that the internal temperature of the speaker increases only up to 120 ° C during continuous driving, while using a single voice coil and no heat dissipation structure. In the single drive system slim speaker, the thermal resistance is concentrated on the voice coil in a single unit, and the internal temperature of the speaker rises above 200 ° C in continuous operation. As described above, the slim speaker uses a high power neodymium magnet due to space constraints, and the neodymium magnet generates severe potatoes in a 200 ° C environment. Therefore, there is a problem that speaker output characteristics deteriorate when driving for a long time. The component speaker for the imaging device must pass the reliability test criteria that checks the characteristic change during the rated input drive for 96 hours. This requires the development of an efficient heat dissipation structure suitable for a single drive slim speaker.

In the conventional component speaker assembly, the general speaker 30 uses ferrite magnets resistant to heat, and the conventional slim speaker uses a plurality of drive systems in which heat is dissipated, so that a special heat dissipation structure is not considered. Speaker heat dissipation is mainly considered for high power speakers driven by high driving power. High-powered speakers have less space and manufacturing cost constraints than speakers for video device components, so they use expensive heat-resistant materials, add complex heat-resistant structures, or add bulky heatsinks. The structure has a problem that it is not suitable for application to the component speaker for the image device having a large constraint of space and manufacturing cost.

Korean Patent Publication No. 10-1560363 of "Sleevis Co., Ltd." discloses a speaker assembly including a radiator in direct contact with the upper surface of the yoke. According to this structure, the radiator is in direct contact with the yoke and has the effect of quickly dissipating heat inside the speaker assembly through conduction.

Meanwhile, a speaker structure for absorbing split vibration using a viscoelastic body has been disclosed.

Japanese Unexamined Patent Publication No. 1984-094996 "Coin-Type Speaker" discloses a speaker assembly using edges whose short sides are filled with viscoelastic material. According to this structure, the viscoelastic material absorbs resonant energy at both ends of the diaphragm to reduce the split vibration. However, such a structure is for use in a cone-shaped diaphragm with high diaphragm rigidity, and when a flat diaphragm with low rigidity is used, there is a problem in that acoustic characteristics change due to excessive drop in compliance of edges at both ends.

Japanese Laid-Open Patent Publication No. 2001-285991 "Speaker" of Panasonic discloses a speaker assembly using an edge whose edge is filled with viscoelastic material. According to this structure, the viscoelastic material has an effect of preventing the deformation of the edge of the corner portion. However, such a structure is effective in the rectangular diaphragm of which the angle changes rapidly, but it is difficult to expect the effect in the track diaphragm as shown in FIG.

Japanese Laid-Open Patent Publication No. 1995-046688 "loudspeaker" discloses a speaker assembly using a cone-shaped diaphragm including a hole filled with viscoelastic material. According to this structure, the viscoelastic material has an effect of alleviating the split vibration of the diaphragm. However, this structure is a structure that can be considered in a conventional general speaker in which the voice coil penetrates the upper surface of the diaphragm, and it is difficult to use in a speaker assembly in which a separate hole is not formed in the diaphragm. In addition, simply adding viscoelastic material to the diaphragm in the planar diaphragm does not achieve sufficient split vibration relaxation effect.

Japanese Laid-Open Patent Publication No. 1989-269396 Japanese Laid-Open Patent Publication No. 1997-200891 Japanese Patent Publication No. 4590403 Korean Patent Publication No. 10-0665530 Korean Utility Model Publication No. 20-1989-0001812 Japanese Laid-Open Patent Publication No. 1989-027399 Japanese Patent Publication No. 3613881 Japanese Laid-Open Patent Publication No. 1998-327491 Korean Unexamined Patent Publication No. 10-2010-0011199 Korean Patent Publication No. 10-0963559 Korea Patent Publication No. 10-1560365 Korean Unexamined Patent Publication No. 10-2016-0089264 Korean Patent Publication No. 10-1564896 Korea Patent Publication No. 10-1737813 Korea Patent Publication No. 10-1560363 Japanese Unexamined Patent Publication No. 1984-094996 Japanese Laid-Open Patent Publication No. 2001-285991 Japanese Unexamined Patent Publication No. 1995-46688

The diaphragm assembly and the speaker assembly according to the present invention may further include a diaphragm having extension portions formed at both end portions of the long axis and a viscoelastic material coupled to the bottom surface of both end portions of the long axis, thereby effectively suppressing divided vibrations near both ends of the diaphragm.

The diaphragm assembly and the speaker assembly according to the embodiment of the present invention further include a viscoelastic material coated with a viscoelastic material to further suppress split vibration near both ends of the diaphragm.

The diaphragm assembly according to the present invention is a diaphragm assembly using a flat diaphragm and having a length in the major axis direction of at least three times the length in the minor axis direction, wherein the vibration plate generates sound pressure by vibration, and An edge connecting the diaphragm and the fixed end, the diaphragm comprising: a vibrating surface having an edge portion; Extension portions each extending outward from at least a portion of the edge portion near both ends of the long axis of the vibration surface, the ends of which are not fixed to the fixed end; And viscoelastic bodies respectively coupled to bottoms near both ends of the long axis of the vibrating surface, wherein the edge includes: an inner fixing part fixed to an edge portion of the diaphragm; An outer fixing part fixed to the fixing end; And a connection part connecting the inner fixing part and the outer fixing part.

In the diaphragm assembly according to the embodiment of the present invention, the viscoelastic bodies are each coupled to each other within 1/5 of the longitudinal length of the diaphragm at both ends of the diaphragm.

In the diaphragm assembly according to the embodiment of the present invention, the viscoelastic body is characterized in that the mass of 10% to 20% of the mass of the diaphragm.

The diaphragm assembly according to the embodiment of the present invention may further include a viscoelastic material applied to cover the viscoelastic material.

In the diaphragm assembly according to the embodiment of the present invention, the extension portion is characterized in that it comprises a form in which the edge of the vibration surface is extended flat.

In the diaphragm assembly according to the embodiment of the present invention, the extension part is characterized in that it comprises a form further away from the side formed with the connection portion based on the inner fixing portion.

In the diaphragm assembly according to the embodiment of the present invention, the extension portion is characterized in that the form extending to more than 1/2 of the width of the connecting portion 2/3 or less.

In the diaphragm assembly according to the embodiment of the present invention, the viscoelastic material is connected to the extension portion and is applied.

In the diaphragm assembly according to the embodiment of the present invention, the viscoelastic material is characterized in that it is applied to the upper surface of the extension portion facing the connecting portion, and the bottom surface of the extension portion.

In the diaphragm assembly according to the embodiment of the present invention, the viscoelastic material is applied to an upper surface of the extension part facing the connection part and an inner surface of the connection part facing the extension part and filled in a space surrounded by the extension part and the connection part. It is characterized by.

In the diaphragm assembly according to the embodiment of the present invention, the diaphragm is provided with one vibration source in the center thereof.

The speaker assembly according to the present invention comprises: a diaphragm assembly according to the present invention; A voice coil fixed to the diaphragm; A magnetic circuit for vibrating the voice coil; And a frame in which the outer fixing part of the edge is fixed and the magnetic circuit is fixed.

An imaging apparatus according to the present invention includes an image output module; And a sound output module, wherein the sound output module comprises a speaker assembly according to the present invention.

Communication device according to the invention, the communication module; And a sound output module, wherein the sound output module comprises a speaker assembly according to the present invention.

The diaphragm assembly and the speaker assembly according to the present invention include a diaphragm having extension parts formed at both end portions of the long axis and a viscoelastic material coupled to the bottom surface of both end portions of the long axis, thereby providing an effect of suppressing split vibration near both ends of the diaphragm.

The diaphragm assembly and the speaker assembly according to the embodiment of the present invention include a viscoelastic material coated with a viscoelastic material, thereby providing an effect of further suppressing divided vibrations near both ends of the diaphragm.

1 illustrates a top view of a speaker assembly in accordance with an embodiment of the present invention.
2 shows a bottom view of a speaker assembly according to an embodiment of the invention.
3 is a view showing a coupled state of a speaker assembly according to an embodiment of the present invention.
4 illustrates components of a speaker assembly according to an embodiment of the invention.
5 is a view showing a diaphragm upper surface according to the embodiment of the present invention.
6 illustrates a bottom of a diaphragm according to an embodiment of the present invention.
7 illustrates an upper surface of an edge according to an embodiment of the present invention.
8 illustrates a bottom surface of an edge according to an embodiment of the present invention.
9 is a view showing an upper surface of the assembled state of the diaphragm and the edge according to the embodiment of the present invention.
10 is a view showing the bottom of the assembled state of the diaphragm and edge according to the embodiment of the present invention.
11 illustrates a suspension according to an embodiment of the present invention.
12 illustrates a suspension according to another embodiment of the present invention.
13 illustrates a suspension according to another embodiment of the present invention.
14 is a view showing the bottom of the assembled state of the diaphragm, edge and suspension according to an embodiment of the present invention.
15 shows a bottom view of a diaphragm assembly in accordance with an embodiment of the present invention.
Figure 16 is a view showing the top surface of the coupling state of the suspension and bobbin according to an embodiment of the present invention.
17 is a view showing a soldering state of a suspension and a voice coil according to an embodiment of the present invention.
18 shows a bottom view of a diaphragm assembly in accordance with an embodiment of the present invention.
19 illustrates a cross section of a diaphragm assembly in accordance with an embodiment of the present invention.
20 illustrates a top surface of a frame according to an embodiment of the invention.
21 is a view showing the bottom of the frame according to the embodiment of the present invention.
22 illustrates a heat sink in accordance with an embodiment of the present invention.
23 illustrates a heat sink and a yoke according to an embodiment of the present invention.
24 shows a top view of a frame assembly according to an embodiment of the invention.
25 is a graph of frequency versus sound pressure level of a single driveline slim speaker assembly in accordance with an embodiment of the present invention.
FIG. 26 is a graph of frequency versus sound pressure level of a single driveline slim speaker assembly using suspension without a second coupling. FIG.
27 is a graph of frequency vs. sound pressure level of a single driveline slim speaker using a diaphragm not including viscoelastic material.
28 is a graph of frequency vs. sound pressure level before and after a reliability test of a single driveline slim speaker assembly in accordance with an embodiment of the present invention.
29 is a diagram showing a top surface of a conventional general speaker.
30 is a diagram illustrating a suspension of a conventional multiple drive system slim speaker.
Fig. 31 is a diagram illustrating a soldering state of a suspension and a voice coil of a conventional multiple drive system slim speaker.

Terms used in the present specification are as follows. "Rectangle" means a rectangular, track-shaped, or elliptical shape with a long axis in the length (L) direction and a short axis in the width (W) direction as shown in FIG. "Long axis" means a virtual axis in the length (L) direction of the speaker assembly, "short axis" means a virtual axis in the width (W) direction of the speaker assembly. "Long side" means the outermost side formed long in the long axis direction. "Short side" means the outermost side formed short in the short axis direction, and may be curved in the track-shaped embodiment as shown in FIG.

"Upper" means the direction that the vibrating surface of the diaphragm faces in the speaker assembly of FIG. “Lower” means the direction that the yoke bottom faces in the speaker assembly of FIG. 2. "Upper surface" means the surface facing the "upper side" in the state that the speaker is assembled. "Bottom" refers to a surface facing the "top" and facing the "bottom" in the state where the speaker is assembled.

The term "boy coil" refers to the voice coil itself in which electrical conduction and electromagnetic force are applied in the electrical description, but in the structural description, it refers to the voice coil and the bobbin in which the voice coil is wound.

"General speaker" or "general speaker assembly" means a speaker assembly using rectangular and cone diaphragms and using dampers to penetrate through the voice coil. "Slim speaker" or "slim speaker assembly" means a speaker assembly using rectangular and planar diaphragms and using a suspension that couples to the bottom of the diaphragm without penetrating the voice coil.

"Multiple drive systems" means that a single diaphragm drives a plurality of voice coils and a plurality of magnetic circuits corresponding thereto. "Single drive system" means that a single diaphragm is driven by a single voice coil and a single magnetic circuit.

Hereinafter, with reference to the drawings will be described the speaker assembly 10 and the components constituting the speaker assembly 10 according to the present invention.

[Speaker Assembly]

The speaker assembly 10 according to the present invention includes a diaphragm 100, an edge 200, a suspension 300, a voice coil 400, a frame 500, and a magnetic circuit 600. The diaphragm 100, the edge 200, the suspension 300, and the voice coil 400 constitute a diaphragm assembly 12 that vibrates according to the vibration of the voice coil 400, as shown in FIG. 15. As shown in FIG. 24, the frame 500 and the magnetic circuit 600 form a frame assembly 14 that does not vibrate even with the vibration of the voice coil 400. For embodiments that further include a heat sink 700 and / or a radiator 800, the heat sink 700 and / or radiator 800 may constitute the frame assembly 14.

1 shows an upper side of a speaker assembly 10 according to an embodiment of the invention. The edge 200 coupled with the edge portion 110 of the diaphragm 100 is coupled to the upper side of the frame 500.

The speaker assembly 10 according to the present invention has a long axis direction (x) length (L) is formed longer than the short axis direction (y) length (W), preferably the long axis direction (x) length (L) is a short axis direction ( y) may be formed to three times or more the length (W). For reference, in the embodiment of FIG. 1, the length L of the major axis direction (x) is 85 mm, the length W of the minor axis direction (y) is 18 mm, and the length L of the major axis direction (x) is the minor axis direction (y). It is 4.72 times the length (W). The rectangular speaker assembly 10 is suitable for coupling to the image device bezel.

2 shows a lower side of a speaker assembly 10 according to an embodiment of the invention. The yoke 610 is coupled to the bottom of the frame 500 of the speaker assembly 10. The bottom surface 510 of the frame 500 may improve the heat dissipation performance of the speaker assembly 10 by exposing the bottom surface of the yoke 610. In some embodiments, the pair of heat sinks 700 disposed adjacent to the yoke 610 may be further coupled to the bottom surface 510 of the frame 500. The area of the bottom surface 510 to which the heat sink 700 is coupled is formed higher than the area of the bottom surface 510 to which the yoke 610 is coupled, thereby exposing a portion of the lower side of the heat sink 700 so as to expose the portion of the speaker assembly 10. It is desirable to improve the heat dissipation performance.

In some embodiments, the speaker assembly 10 may further include a radiator 800 to improve heat dissipation performance.

3 and 4 show a combined state of the speaker assembly 10 according to the embodiment of the present invention. The speaker assembly 10 according to the present invention comprises a diaphragm assembly 12 and a frame assembly 14. The voice coil 400 is configured to be located in the magnetic gap of the magnetic circuit 600. As shown in FIG. 3, the magnetic circuit 600 may be a magnetized shape including a yoke 610, a magnet 620 disposed in the center of the yoke 610, and a plate 630 disposed on the magnet 620. According to an embodiment, the magnetic circuit 600 is an external magnet composed of a center pole, an annular magnet positioned around the center pole, and an annular plate disposed on the magnet, or magnets 620 on the inside and outside of the voice coil 400. ) May be of a complex type.

Hereinafter, each component will be described in detail with reference to the accompanying drawings.

[tympanum]

5 shows a top surface of a diaphragm 100 in accordance with an embodiment of the present invention. The planar shape of the diaphragm 100 has a rectangular shape having a long axis x and a short axis y, and may be, for example, rectangular, track or oval. The cross-sectional shape of the diaphragm 100 according to the present invention consists of a substantially planar shape. Compared to the cone diaphragm and dome diaphragm having a three-dimensional shape, the flat diaphragm 100 may be less rigid but lower the height of the speaker assembly 10. The diaphragm 100 material is not particularly limited and may be pulp, polymer film, FPCB, honeycomb, glass fiber, carbon fiber, or the like.

As shown in FIG. 5, the diaphragm 100 includes a vibrating surface 130 and an edge portion 110. The vibration surface 130 may further include a concave portion 132 and a convex portion 134 for rigid reinforcement. As shown in FIG. 5, the diaphragm 100 preferably has a rigid reinforcing structure in which the height difference between the convex portion 134 and the concave portion 132 decreases from the center toward the outer side of the major axis direction x. According to such a structure, not only the vibration of the diaphragm 100 can be increased to alleviate the split vibration, but also the center stiffness is higher than the stiffness at both ends in the long axis direction (x).

As shown in FIG. 5, the diaphragm 100 may further include an extension part 120 extending outward from the edge part 110 at both ends in the long axis direction x. The extension part 120 may be configured to be fixed to a fixed end such as the frame 500 or not fixed to a fixed end such as the frame 500.

The extension part 120 may be bent downward, or may be horizontally extended or bent upward as shown in FIG. 5 according to desired acoustic characteristics. The extension part 120 of the diaphragm 100 provides an effect of relieving split vibration such as torsional vibration that may occur at both ends of the long axis direction x to improve acoustic performance.

6 shows a bottom surface of a diaphragm 100 in accordance with an embodiment of the present invention. At the bottom of the diaphragm 100, the concave portion 132 has a convex shape on the contrary, and the convex portion 134 has a concave shape on the contrary. Meanwhile, as shown in FIG. 14, the bottom of the edge 110 and the bottom of the central region of the recess 132 preferably have the same height in order to attach the suspension 300 having a planar shape.

[edge]

7 illustrates a top surface of an edge 200 according to an embodiment of the present invention. The edge 200 is formed in a ring shape so that the vibration surface 130 of the diaphragm 100 is exposed through the center portion, and includes an inner fixing portion 210, an outer fixing portion 220, and a connecting portion 230. The outer fixing part 220 is fixed to the frame 500, the inner fixing part 210 is fixed to the edge portion 110 of the diaphragm 100, the edge 200 through the elasticity of the connecting portion 230 is the diaphragm 100 The elastic support to perform a function to provide a restoring force to the diaphragm 100. The material of the edge 200 is not particularly limited and may be, for example, an elastic material such as thermoplastic polyurethane (TPU: Thermoplastic Polyurethane), nitrile butadiene rubber (NBR: Nitrile Butadiene Rubber), natural rubber, silicone, or the like.

8 illustrates a bottom surface of an edge 200 according to an embodiment of the present invention. As shown in FIG. 19, the bottom of the inner fixing part 210 may be combined with an upper surface of the edge of the diaphragm 100, and the bottom of the outer fixing part 220 may include a flat surface. It may be combined with the upper surface of the third coupling portion 340 that is the edge of the suspension 300 which is fixed to the 500. The connecting portion 230 may be formed in a roll shape having a convex shape upward as shown in FIG. 7. According to the exemplary embodiment, it may be an inverted roll shape having a lower convex shape or a corrugated shape formed by connecting a plurality of convex portions 134.

9 illustrates a top surface of the diaphragm 100 and the edge 200 in a coupled state, and FIG. 10 illustrates a bottom surface of the diaphragm 100 and the edge 200 in a coupled state. The upper surface of the vibrating surface 130 is exposed through the opening of the edge 200. In an embodiment in which the diaphragm 100 includes the extension part 120, the extension part 120 may be located adjacent to the connection part 230 on the short side of the edge 200 as shown in FIG. 10. .

[Suspension]

12 shows a suspension 300 according to an embodiment of the invention. The suspension 300 provides a mechanical restoring force to the diaphragm 100 together with the edge 200, a function of reinforcing the rigidity of the diaphragm 100, and an electrical path between the voice coil 400 and an external circuit. You can perform a combination of functions.

Compared with the damper 32 of the conventional general speaker 30, the damper 32 is not coupled to the bottom of the diaphragm, but the suspension 300 is coupled to the bottom of the diaphragm 100 due to space constraints, and the damper 32 ) Is coupled through the bobbin, but the suspension 300 is coupled to the upper surface of the bobbin 410 through the bottom surface. Due to this difference, the damper 32 of the conventional general speaker 30 provides the restoring force to the diaphragm through the bobbin, whereas the suspension 300 of the slim speaker directly provides the restoring force to the diaphragm 100.

The suspension 300 may perform a combination of a function of providing a restoring force to the diaphragm 100, a function of reinforcing the rigidity of the diaphragm 100, and a function of providing an electrical path to the voice coil 400.

In order for the suspension 300 to provide a restoring force to the diaphragm 100, a portion of the suspension 300 is coupled to the bottom of the diaphragm 100, and a portion of the suspension 300 is coupled to an upper surface of the side wall of the frame 500, which is a fixed end. The region provides elastic force to the diaphragm 100 without engaging other components.

The partial vibration may be alleviated by additionally reinforcing the rigidity of the diaphragm 100 through a portion of the suspension 300 coupled to the bottom of the diaphragm 100. The suspension 300 preferably increases the sound pressure level of the single drive system slim speaker by selectively reinforcing only the central region of the diaphragm 100.

In order for the suspension 300 to function as an electrical path, the suspension 300 may be made of a conductive material such as phosphor bronze, or a conductive path may be formed in a portion of the suspension 300 of an insulating material. In addition, as shown in FIG. 12, the suspension 300 symmetrically divided about the long axis x may be configured to be electrically connected to both ends of the voice coil 400, respectively. The electrode unit 350 may be formed at an end portion of the long axis direction x to receive an audio signal from an external circuit. The electrode unit 350 may be configured to be exposed to the outside in the assembled state as shown in FIG.

The electrode pieces 350 adjacent to each other may further include a connection piece 352 as shown in FIG. 13. The connecting piece 352 serves to increase the assembly convenience by connecting the divided suspension 300 in the assembly process, and after the assembly of the diaphragm 100 so that the divided suspension 300 functions as an electrical path, the connecting piece 352. ) Can be removed.

The suspension 300 used in the space-limited slim speaker is formed in a substantially planar shape. Suspension 300 material is not particularly limited and may be a metal material such as SUS (Steel Use Stainless) or phosphor bronze, in consideration of electrical conductivity, elastic force, manufacturing cost, or may use FPCB.

The suspension 300 may be implemented in various forms. FIG. 11 illustrates an embodiment in which the elastic support part 330 is directly connected to the first coupling part 310 supporting the voice coil 400, and FIG. 12 shows the elastic support part 330 being rigid in the center portion of the diaphragm 100. An embodiment in which the first coupling portion 310 is connected to the first coupling portion 310 through a second coupling portion 320 to reinforce the elastic support portion 330 is directly connected to the first coupling portion 310, and the diaphragm 100 illustrates an embodiment in which the second coupling part 320 that reinforces the stiffness of the central part extends separately from the elastic support part 330 in the first coupling part 310.

The suspension 300 according to the embodiment of FIG. 11 includes a first coupling part 310, a third coupling part 340, and an elastic support part 330. The first coupling part 310 is coupled to at least a portion of the upper surface of the voice coil 400 or the upper surface of the bobbin 410 in which the voice coil 400 is wound through at least a portion of the bottom surface, and the vibration surface 130 through the upper surface. Combine with part of the bottom. In the case of the single drive system slim speaker assembly 10, the first coupling part 310 is positioned at the center of the suspension 300. Through this structure, the first coupling part 310 fixes the voice coil 400 and performs a function of coupling the central portion of the suspension 300 to the vibration surface 130.

On the other hand, in the embodiment in which the vibrating surface 130 includes a rigid reinforcing structure such as the concave portion 132 and the convex portion 134, the bottom of the diaphragm 100 is not flat due to the concave portion 132 and the convex portion 134. Since the edge portion 110 of the diaphragm 100 and the first coupling portion 310 of the suspension 300 intersect and the bottom of the recess 132 of the diaphragm 100 and the first coupling of the suspension 300 A portion of the upper surface of the first coupling portion 310 is coupled to a portion of the bottom surface of the diaphragm 100 by a fixing means such as an adhesive at the point where the portion 310 intersects.

As shown in FIG. 13, the first coupling part 310 may be formed to have the same cross-sectional shape as the voice coil 400, but as shown in FIG. 11, an area adjacent to the third coupling part 340 is straight. It is preferably configured to further increase the area to be coupled to the edge portion 110 of the vibration surface 130 while providing additional rigidity in the center of the vibration surface 130.

The third coupling part 340 forms the outermost part of the suspension 300. The planar shape of the third coupling part 340 may be configured to have the same planar shape as the outer fixing part 220 of the edge 200. For example, when the outer fixing part 220 of the edge 200 is formed in a track shape, the third coupling part 340 may also be formed in a track shape.

The third coupling part 340 is coupled to the bottom surface of the edge 200 through the top surface, and is coupled to the top surface of the frame 500 through the bottom surface. In detail, the third coupling part 340 is coupled to the outer fixing part 220 of the edge 200 through the top surface, and is coupled to the top surface of the side wall of the frame 500 through the bottom surface. Electrode portions 350 may be further formed at both ends of the long axis direction x of the third coupling portion 340.

The elastic support part 330 extends from the first coupling part 310 to be connected to the third coupling part 340, and the upper and lower surfaces thereof do not couple with other components to elastically support the diaphragm 100. The elastic support 330 is located below the connecting portion 230 of the edge 200 having a convex shape upward to provide a suitable mechanical restoring force to the diaphragm 100 without interference with other components during the vibration of the diaphragm 100. Do this. The elastic support 330 may be configured as four, as shown in Figure 11, may be configured as two. The number, shape, and length of the elastic support 330 may be selected according to the acoustic characteristics required for the speaker assembly 10 and the compliance required for the suspension 300.

12 illustrates a suspension 300 according to another embodiment of the present invention. The suspension 300 includes the first coupling part 310, the second coupling parts 320, the third coupling part 340, and the elastic support part 330. The first coupling part 310 is composed of a single first coupling part 310 positioned at the center and coupled to the voice coil 400 through the bottom surface as shown in FIG. 15.

As shown in FIG. 14, when combined with the vibration surface 130 having the concave portion 132 and the convex portion 134, the first coupling portion of the edge portion 110 of the diaphragm 100 and the suspension 300 ( A portion of the upper surface of the first coupling portion 310 is formed by an adhesive or the like through the intersection of the 310 and the intersection of the bottom surface of the recess 132 of the diaphragm 100 and the first coupling portion 310 of the suspension 300. It is coupled to a part of the bottom surface of the diaphragm 100 by the fixing means.

As shown in FIG. 13, the first coupling part 310 has the same shape as the plane of the voice coil 400, or as shown in FIG. 11 or 12, an area adjacent to the third coupling part 340 is formed. It is preferable that the first coupling part 310 is configured to provide additional rigidity in the center of the vibration surface 130 while increasing the area formed in a straight line to be coupled to the edge portion 110 of the vibration surface 130.

The second coupling parts 320 extend outwardly from the first coupling part 310 and are coupled to the bottom surface of the diaphragm 100 through the top surface as shown in FIG. 14. In particular, as shown in FIGS. 5 and 6, the diaphragm 100 includes an edge portion 110 having a flat surface and a vibration surface 130 connected from the edge portion 110. The vibration surface 130 has a long axis direction. In the case of including a concave portion 132 formed of (x) and a convex portion 134 connecting the concave portion 132 and the edge portion 110, the second coupling portions 320 are shown in FIG. As can be configured to engage with the bottom surface of the edge portion 110 of the diaphragm 100, respectively.

The third coupling part 340 forming the outermost part of the suspension 300 is coupled to the bottom surface of the edge 200 through the top surface, and is coupled to the top surface of the frame 500 through the bottom surface.

The plurality of elastic support parts 330 extend from each of the second coupling parts 320 to be connected to the third coupling part 340, and the upper and lower surfaces thereof do not couple with other components to elastically support the diaphragm 100.

As shown in FIG. 12, the pair of second coupling parts 320 extending in one direction of the major axis direction x and the second coupling part 320 extend in the other direction of the major axis direction x. In the case of a pair of second coupling parts 320, the elastic support part 330 is composed of four elastic support parts 330 extending from four second coupling parts 320, respectively. In this case, the distance between the pair of second coupling parts 320 facing each other is formed to be narrower than the distance between the pair of elastic support parts 330 facing each other.

If the length L ₁ of the second coupling part 320 is longer, the stiffness of the diaphragm 100 is increased, and if the length L ₂ of the elastic support part 330 is longer, the compliance of the speaker is increased. do. The length (L ₂₎ of the second coupling part 320, the length (L ₁₎ and the resilient support 330 in the longitudinal (L _sus) of limited overall suspension 300, as shown back in FIG. 12 is another tradeoff is in a trade off relationship. Therefore, the selection of the appropriate length is important.

In contrast to the diaphragm of the general speaker that piston vibration is advantageous, in the diaphragm 100 of the single drive system slim speaker to which the present invention is applied, it is preferable to selectively reinforce the rigidity of the diaphragm center, not the entire diaphragm. Therefore, if the length L ₁ of the second coupling part 320 attached to the diaphragm 100 is too long, the overall rigidity of the diaphragm 100 may increase, and thus the acoustic characteristics may deteriorate. Therefore, it is preferable that the length L ₁ of the second coupling part 320 is shorter than the length L ₂ of the elastic support part 330. As a result of the acoustic characteristics test for the suspension 300 having various shapes, the length L ₁ of the second coupling part 320 is 5% to 15% of the long axis direction x length L _sus of the suspension 300. Preferably, the length L ₂ of the elastic support 330 is preferably 10% to 25% of the long axis direction x length L _sus of the suspension 300.

FIG. 25 is a graph illustrating a sound pressure level (SPL) graph of a single driving system slim speaker using the suspension 300 according to the embodiment of FIG. 12 including the second coupling unit 320, and FIG. 26 is a second diagram. 11 illustrates a sound pressure level graph of a single drive-type slim speaker using the suspension 300 according to the embodiment of FIG. 11 that does not include the coupling part 320. It is confirmed that the suspension 300 including the second coupling part 320 selectively strengthens the rigidity at the center of the diaphragm 100 to flatten the acoustic characteristics of the speaker assembly 10.

The suspension 300 according to the embodiment of FIG. 13 includes a first coupling part 310, a second coupling part 320, a third coupling part 340, and an elastic support part 330. The first coupling part 310 is coupled to at least a portion of the upper surface of the voice coil 400 or the upper surface of the bobbin 410 in which the voice coil 400 is wound through at least a portion of the bottom surface, and the vibration surface 130 through the upper surface. Combine with some of the bottom of the. In the case of the single drive system slim speaker assembly 10, the first coupling part 310 is positioned at the center of the suspension 300. Through this structure, the first coupling part 310 fixes the voice coil 400 and performs a function of coupling the central portion of the suspension 300 to the vibration surface 130.

The second coupling part 320 extends outward from the first coupling part 310 to be coupled to the bottom surface of the edge part 110 of the diaphragm 100 to selectively reinforce the rigidity of the central part of the diaphragm 100. Unlike the embodiment of FIG. 12, the second coupling part 320 of FIG. 13 is not connected to the third coupling part 340. As shown in FIG. 13, the second coupling part 320 may also extend to the inside of the first coupling part 310.

The third coupling part 340 is coupled to the bottom surface of the edge 200 through the top surface, and is coupled to the top surface of the frame 500 through the bottom surface. The third coupling part 340 forms the outermost part of the suspension 300. In detail, the third coupling part 340 is coupled to the outer fixing part 220 of the edge 200 through the top surface, and is coupled to the top surface of the side wall of the frame 500 through the bottom surface. Electrode portions 350 may be further formed at both ends of the long axis direction x of the third coupling portion 340.

The elastic support part 330 extends from the first coupling part 310 to be connected to the third coupling part 340, and the upper and lower surfaces thereof do not couple with other components to elastically support the diaphragm 100. The elastic support 330 is located below the connecting portion 230 of the edge 200 having a convex shape upward to provide a suitable mechanical restoring force to the diaphragm 100 without interference with other components during the vibration of the diaphragm 100. Do this. The elastic support 330 may be configured as four as shown in Figure 13, as disclosed in the Patent Publication No. 10-1625932 "Speaker device suspension 300 and the speaker device applied thereto" of the present patent application It can be composed of two. The number, shape, and length of the elastic support 330 may be selected according to the acoustic characteristics required for the speaker assembly 10 and the compliance required for the suspension 300.

[Example of Suspension Including Hanging Groove]

The voice coil 400 or bobbin 410 is attached to the bottom of the suspension 300, and the magnetic gap between the outer wall of the plate 630 of the magnetic circuit 600 and the inner wall of the yoke 610, as shown in FIG. Located in between. Hereinafter, as shown in FIG. 12, an embodiment in which the first coupling part 310 includes a locking groove 311 for aligning the voice coil 400 will be described in detail.

The assembly of the voice coil 400 is a bonding process for attaching the upper surface of the bobbin 410 to the bottom of the first coupling portion 310 of the suspension 300 and the divided portions of the suspension 300 at both ends of the voice coil 400. It consists of a soldering process for soldering each. Soldering process is a process of high assembly difficulty because the soldering of the end of the very thin wire coil 400.

Meanwhile, referring to FIGS. 30 and 31, a conventional voice coil assembling process will be described. The worker assembles the bobbin and the suspension 40 by combining the first jig in which the bobbin is placed and the second jig in which the suspension 40 is placed so that the top face is upward. Thereafter, the suspension 40 and the bobbin assembly are removed from the assembly jig, and the assembly is turned upside down so that the bottom of the bobbin faces upward. Next, as shown in FIG. 30, the end of the voice coil 50 is hooked to the stopping jaw 41 of the suspension 40 and the bottom surface of the stopping jaw 41 is soldered. At this time, since the soldering region 52 is located on the bottom surface of the suspension 40 rather than the top surface, the work piece needs to be flipped several times.

In addition, the soldering region 52 is spaced apart from the voice coil coupling portion, and the end portion 51 of the voice coil 50 is diagonally connected as shown in FIG. 31. On the other hand, the tension applied to the voice coil 51 changes due to the divided vibration of the diaphragm or the suspension 40. As a result, disconnection of the voice coil 51 due to stress occurs, thereby deteriorating the reliability of the speaker assembly.

Suspension 300 according to an embodiment of the present invention including a locking groove 311 is formed in a planar shape. Suspension 300 according to the present embodiment is coupled to the bottom surface of the diaphragm 100 through the upper surface, the first coupling portion 310 for coupling with the upper surface of the bobbin 410 wound around the voice coil 400 through the bottom surface It is configured to include. The first coupling part 310 includes an extension area 313. The expansion area 313 is formed to extend beyond the outer diameter of the bobbin 410 indicated by broken lines in FIG. 16 on the outside, and to extend below the inner diameter of the bobbin 410 on the inside. The extended area 313 also provides an effect of reinforcing and bonding the upper side of the bobbin 410 in the bonding process of the bobbin 410.

The expansion area 313 further includes a locking groove 311, and the locking groove 311 has an end portion of the voice coil 400 which is not wound on the bobbin 410 as shown in FIGS. 16 and 17. Losing functions. The locking groove 311 is preferably formed in a groove shape that is dug inwardly by the outer diameter of the bobbin 410 at the outer circumference of the expansion region 313.

Since the end portion of the voice coil 400 extends straight along the bobbin 410, the tension change does not occur even when the vibration of the diaphragm 100 or the suspension 300 is divided. Therefore, according to this embodiment, it is possible to reduce the possibility of disconnection of the voice coil 400, thereby improving the reliability of the speaker assembly 10.

On the other hand, the soldering position is more preferable in terms of process efficiency, rather than the bottom of the suspension 300. In this case, the worker can solder the voice coil 400 in a state in which the workpiece is coupled to the assembly jig without removing the workpiece from the assembly jig or inverting the workpiece upside down. To this end, the first coupling part 310 preferably further includes a soldering part 312 extending in an inner direction of the bobbin 410 as shown in FIG. 17. On the other hand, the soldering portion 312 is preferably formed adjacent to the region where the engaging groove 311 is formed.

Since the solder having a certain height is located on the upper surface of the soldering portion 312, the upper surface of the soldering portion 312 should not be adhered or adhered to the bottom of the diaphragm 100. For example, in the rectangular speaker assembly 10 in which the length of the long axis direction x is formed at least three times the length of the short axis direction y, the diaphragm 100 is flat as shown in FIGS. 5 and 6. The edge portion 110 and the vibration surface 130 is connected to the edge portion 110 is formed, the vibration surface 130 is a concave portion 132 and the concave portion 132 formed in the long axis direction (x) and When the convex part 134 is connected to the edge part 110, the soldering part 312 may be configured to be positioned below the convex part 134 as shown in FIG. 14.

Since one voice coil 400 has two ends, only two locking grooves 311 may be formed. However, in this case, since the direction is generated in the suspension 300, there is a disadvantage in the process management. In order to solve this problem, the first coupling part 310 may be configured to include four locking grooves 311 as shown in FIG. 17. In an embodiment that further includes a soldering portion 312, the first coupling portion 310 may include only two soldering portions 312, but further includes four soldering portions 312 as shown in FIG. 17. It is preferable to configure. According to this embodiment there is an effect that can be soldered to the voice coil in the same position even when the suspension is turned upside down or rotated 180 degrees in the assembly process,

The suspension 300 including the locking groove 311 according to the present exemplary embodiment may be used in various speakers using a flat diaphragm and a flat suspension without being limited to the rectangular speaker assembly or the single drive system speaker assembly 10. For example, the present embodiment may be applied to a circular or square speaker, and may also be applied to a suspension 300 of a conventional multi-drive slim speaker as shown in FIG. 30, and an elastic support unit as shown in FIG. 11 or 13. 330 may extend from the first coupling part 310 to be applied to the suspension 300 connected to the third coupling part 340, and as shown in FIG. 12, the elastic support part 330 may be the second coupling part. It may also be applied to the suspension 300 extending from 320 to be connected to the third coupling portion 340.

The speaker assembly 10 including the suspension 300 according to the present embodiment may be used for an audio output module of an image device such as a TV, a monitor, and the like including an image output module and an audio output module. In addition, the speaker assembly 10 including the suspension 300 according to the present embodiment may be used in a communication device such as a smartphone, a tablet PC, and the like including a communication module and an audio output module.

Embodiment of Diaphragm Assembly Including Viscoelastic Body

Since the single drive system rectangular slim speaker assembly 10 has a small area of the diaphragm 100 to which the driving force is transmitted and lacks the rigidity of the flat diaphragm 100, in particular, the vibration is divided near both ends of the long axis direction x of the diaphragm 100. This happens badly. According to the structure of the diaphragm 100 coated with the viscoelastic material 150 between the extension portion 120 and the edge 200 added to both ends, it is possible to mitigate the effect of the split vibration of the end of the diaphragm 100.

On the other hand, by further adding a viscoelastic body 140 having a constant mass at both ends of the diaphragm 100, the viscoelastic body 140 can absorb the vibration of the end of the diaphragm 100, by the mass of the viscoelastic body 140 The resistance to torsional vibration can be increased to further mitigate the effects of split vibration.

 Hereinafter, an embodiment including the viscoelastic material 140 will be described with reference to FIGS. 18 and 19. The diaphragm assembly 12 according to the present embodiment is used for the rectangular speaker assembly 10 in which the length of the long axis direction x is formed at least three times the length of the short axis direction y. The diaphragm assembly 12 according to the present exemplary embodiment is configured to include a diaphragm 100 having a planar shape for generating sound pressure by vibration, and an edge 200 connecting between the diaphragm 100 and a fixed end. The fixed end may be a third component 340 of the top of the frame 500 or the suspension 300 as a component that does not vibrate despite the vibration of the diaphragm 100.

The diaphragm 100 includes a vibrating surface 130, extensions 120, and viscoelastic bodies 140. The vibrating surface 130 has an edge portion 110.

The extension part 120 is formed to extend outward from at least a portion of the edge part 110 near both ends of the long axis x of the vibration surface 130, but the end part is not fixed to the fixed end. The extension part 120 may include a form in which an edge of the vibrating surface 130 is extended in a cross-sectional shape, and as shown in FIG. 19, the connection part 230 is formed based on the inner fixing part 210. It may include a form that moves further toward or closer to the side. It is preferable that the width of the extension part 120 is extended to 1/2 or more and 2/3 or less of the width of the connection part 230.

 The viscoelastic body 140, the viscoelastic body is coupled to the bottom surface near both ends of the long axis (x) of the vibration surface 130, respectively. The viscoelastic material 140 has a constant mass, exists in a solid state at room temperature, and is composed of a material capable of absorbing vibration through viscoelasticity, and may be, for example, foamed buoy or foamed urethane.

Coupling positions (L ₃ ) of the viscoelastic body 140 is preferably coupled to each other within 1/5 region of the longitudinal axis (x) length (L _DP ) of the diaphragm 100 at both ends of the diaphragm 100, Figure 18 More preferably, it is located in the area where the extension 120 is formed.

If the mass of the viscoelastic material 140 is too high, the mass of the vibration system is increased, and speaker efficiency is decreased. If the mass of the viscoelastic material 140 is too low, it is very important to select an appropriate mass because the effect of mitigation of split vibration is small. As a result of the experiment, when the mass of the viscoelastic material 140 is 10% to 20% of the mass of the diaphragm 100, the acoustic characteristics are excellent.

The edge 200 includes an inner fixing portion 210, an outer fixing portion 220, and a connecting portion 230 as shown in FIGS. 7 and 8. The inner fixing part 210 is fixed to the edge portion 110 of the diaphragm 100, the outer fixing part 220 is fixed to the fixing end, and the connection portion 230 is the inner fixing part 210 and the outer fixing part ( 220) is configured to connect between. The connecting portion 230 has a convex shape or a corrugated shape, for example, and functions to elastically support the diaphragm 100 without being fixed to other components.

In order to further alleviate the split vibration, the diaphragm assembly 12 preferably further includes a viscoelastic material 150 applied to cover the viscoelastic material 140 as shown in FIG. 19. Unlike the viscoelastic material 140 which is a solid at room temperature, the viscoelastic material 150 exists in the form of a viscous liquid at room temperature and may be, for example, a viscous liquid mainly composed of PVC resin or acrylic resin, and Dongbu Fine Chemical Co., Ltd. Chemicals) D-747 can be exemplified.

The viscoelastic material 150 may be applied by being connected to the extension part 120 of the diaphragm 100, and may be applied to the top surface of the extension part 120 facing the connection part 230 and the bottom surface of the extension part 120. have. According to an embodiment, the viscoelastic material 150 is applied to the upper surface of the extension portion 120 facing the connection portion 230 and the inner surface of the connection portion 230 facing the extension portion 120 and the extension portion 120 and the connection portion ( The space enclosed by 230 may be filled.

Meanwhile, the present embodiment including the viscoelastic material 140 may be applied to the vibration plate 100 using a plurality of vibration sources, but is applied to the vibration plate 100 having one vibration source in the center as shown in FIG. 18. Is more effective. In this case, the vibration source may be not only the voice coil 400 but also another speaker vibration source such as a piezo element.

FIG. 25 illustrates a sound pressure level of a slim speaker using the diaphragm 140 and the diaphragm 140 according to the embodiment of FIG. 19 including the viscoelastic 140 and the viscoelastic 140 applied to the extension 120. (SPL: Sound Pressure Level) graph, FIG. 27 shows a slim speaker using the diaphragm assembly 12 including the viscoelastic material 140 applied to the extension 120 without including the viscoelastic material 140. The sound pressure level graph of is shown. The diaphragm assembly 12 further including the viscoelastic body 140 further relieves the split vibrations at both ends of the diaphragm 100 to effectively remove the dip between 1 kHz and 2 kHz due to the split vibration.

[Frame Assembly]

Hereinafter, the frame assembly 14 will be described with reference to FIGS. 20 through 24. The frame assembly 14 includes a frame 500 and a magnetic circuit 600, and may further include a heat sink 700 and / or a radiator 800 according to an embodiment.

The magnetic circuit 600 may be a magnetic magnetic circuit 600 composed of the yoke 610, the magnet 620, the plate 630, and serves to provide a magnetic force to the voice coil 400 through the magnetic gap. Perform. The magnetic circuit 600 may be an external magnetic circuit 600 composed of a center pole, a magnet 620, and a plate 630, or a mixed magnetic circuit 600 mixed with an external magnet and a magnetic magnet. .

The frame 500 forms the outline of the speaker assembly 10, and has an open top surface, and consists of a bottom surface 510 and a side surface. The material of the frame 500 is not particularly limited, and may be, for example, a polymer resin or a metal. In the case of the single drive system slim speaker assembly 10, the magnetic circuit 600 is coupled to the center of the bottom surface 510. In the state in which the yoke 610 is inserted, the frame 500 may be injection molded to simplify the assembly process. In an embodiment that further includes the heat sink 700 and / or the radiator 800, the frame 500 may be injection molded while the heat sink 700 and / or the radiator 800 is inserted.

The diaphragm assembly 12 may be coupled to an upper portion of the sidewall of the frame 500, and a bottom surface of the outer fixing part 220 of the suspension 300 may be coupled to an upper portion of the sidewall of the frame 500 as illustrated in FIG. 3. .

Meanwhile, in the single drive system slim speaker assembly 10 in which resistance heat is concentrated in a single voice coil 400, a separate heat dissipation structure is required. Hereinafter, a frame 500 according to an embodiment capable of accommodating an efficient heat sink 700 will be described.

Frame 500 according to the present embodiment uses a flat diaphragm 100, the length of the long axis direction (x) to the rectangular speaker assembly 10 is formed at least three times the length of the short axis direction (y). Used. The frame 500 also engages the diaphragm assembly 12 through the top of the side, and engages the yoke 610 through the bottom surface 510.

The bottom surface 510 of the frame 500 includes a first region 520 and a second region 530. As shown in FIG. 20, the first region 520 is a central portion of the frame 500, and a first coupling hole 521 to which the yoke 610 is coupled is formed. The first coupling hole 521 may improve the heat dissipation effect by exposing the bottom surface 510 of the yoke 610 to the bottom surface of the frame 500.

The second region 530 is disposed adjacent to both sides of the major axis direction x of the first region 520. The second region 530 includes a pair of second coupling holes 531 to which the pair of heat sinks 700 are coupled. In this case, the thermal conductivity of the heat sink 700 should be higher than that of the yoke 610. The ferromagnetic material constituting the yoke 610 can be exemplified by iron, nickel, cobalt, permalloy, MKS steel, these materials have a low thermal conductivity of less than 100 W / (mK). Therefore, in order to achieve high heat dissipation, the heat sink 700 must have a high thermal conductivity of 100 W / (m · K) or higher, for example, graphene, silver, copper, gold, aluminum, or an alloy of a plurality of metals. In view of the manufacturing cost, aluminum is most preferable.

As shown in FIG. 3, the second region 530 has a highest point lower than the highest point of the yoke 610 and is formed to have a lowest point higher than the lowest point of the yoke 610 so that the height of the heat sink 700 may be increased. At least one fifth is exposed above the bottom 510 and at least one fifth of the height of the heat sink 700 is exposed below the bottom 510. That is, the upper portion of the heat sink 700 is accommodated in the speaker to absorb as much resistance heat as possible, and the lower portion of the heat sink 700 is exposed to the outside of the speaker and has a structure that emits as much heat as possible.

The second region 530 of the bottom surface 510 supports the middle of the heat sink 700 to stably support the heat sink 700 while increasing the height of the speaker assembly 10 by the heat sink 700. You can prevent it.

More preferably, the second region 530 may have a peak having a height lower than 4/5 of the height of the yoke 610, and may have a lowest point having a height higher than 1/5 of the height of the yoke 610. have. For example, when the height of the yoke 610 is 8 mm, the top surface of the second region 530 has a height lower than 6.4 mm from the bottom, and the bottom surface of the second region 530 has a height higher than 1.6 mm from the bottom. desirable.

In addition, as shown in FIG. 20, the second region 530 is formed at a position higher than the first region 520 so that the bottom surface 510 of the frame 500 has a low center of engagement between the yoke 610 and a heat. It is preferable that the sides of the sink 700 have a high stepped structure.

Meanwhile, in order to define a position at which the heat sink 700 is coupled when the heat sink 700 is coupled to the frame 500, at least a portion of the upper surface of the first region 520 is a part of the bottom surface of the heat sink 700 as illustrated in FIG. It is preferably formed in contact with. Through this structure, it is possible to define the height of the upper region of the heat sink 700 accommodated inside the speaker and the height of the lower region of the heat sink 700 exposed to the outside of the speaker.

Next, the bottom surface 510 of the frame 500 further includes a third region 540 extending from the first region 520 and connecting the second region 530, as shown in FIG. 21. As illustrated in FIG. 3, the third region 540 is preferably formed such that at least a portion of the third region 540 contacts a portion of a side surface of the heat sink 700. The third region 540 firmly supports the outer surface of the central portion of the heat sink 700 to improve the assembly stability of the heat sink 700 and the frame 500.

Meanwhile, in order to improve the heat dissipation effect, the frame 500 may further include third coupling holes 532 to which the radiator 800 is coupled. To this end, the second region 530 is disposed at both sides of the major axis direction x of the first coupling hole 521, and the pair of third coupling holes 532 to which the pair of radiators 800 are coupled to each other. It may further include them.

The speaker assembly 10 according to the embodiment including the heat sink 700 may include a frame 500, a diaphragm 100, an edge 200, a voice coil 400, a suspension 300, a magnetic circuit 600, And a heat sink 700. The speaker assembly 10 according to the present embodiment uses a flat diaphragm 100, and the length of the major axis direction x is formed to be at least three times greater than the length of the minor axis direction y.

The frame 500 has an open top surface, and the edge 200 of the elastic material is coupled to the edge portion 110 of the diaphragm 100. The voice coil 400 is located in the middle as shown in FIG. Compared to the case where a plurality of voice coils 400 are used, when a single voice coil 400 is used, resistance heat increases because power is concentrated in a single voice coil 400. Suspension 300 is coupled to the voice coil 400 through the bottom surface, a portion of the portion is coupled to the diaphragm 100, a portion of the portion is coupled to the frame 500 to elastically support the diaphragm 100.

The magnetic circuit 600 is coupled to the center of the bottom surface 510 of the frame 500 and includes a yoke 610, a magnet 620, and a plate 630.

The pair of heat sinks 700 has a higher thermal conductivity than the yoke 610, is coupled to the bottom surface 510 of the frame 500, and is disposed adjacent to the outer circumferential surface of the yoke 610. As shown in FIG. 23, some regions of the heat sink 700 may be disposed in contact with or in close proximity to some regions of the outer circumferential surface of the yoke 610 to receive heat from the yoke 610. As shown in FIG. 22, the heat sink 700 has a curved area 710 corresponding to the outer circumferential surface of the yoke 610 formed in an area adjacent to the yoke 610 and extends in a direction opposite to the curved area 710. A plurality of heat dissipation fins 720 may be formed.

The bottom surface 510 of the frame 500 includes a first region 520 and a second region 530. The first region 520 is formed with a first coupling hole 521 to which the yoke 610 is coupled. The pair of second coupling holes 531 are disposed adjacent to both sides of the major axis direction x of the first region 520, and the pair of heat sinks 700 are coupled to each other. The second area 530 is formed to have the highest point lower than the highest point of the yoke 610 and the lowest point higher than the lowest point of the yoke 610 so that at least one fifth of the height of the heat sink 700 is bottomed. 510 is exposed upward, and at least 1/5 of the height of the heat sink 700 is exposed below the bottom surface 510.

Hereinafter, repeated descriptions of the embodiment of the frame 500 coupled to the heat sink 700 will be omitted.

The graph of FIG. 28 shows sound pressure levels before and after a 96 hour reliability test of a speaker system incorporating an enclosure and a speaker assembly 10 according to an embodiment including a heatsink 700. The solid line indicates the sound pressure level before the reliability test, and the broken line indicates the sound pressure level after the reliability test. As shown, it is confirmed that there is almost no change in characteristics despite the reliability test. On the other hand, the temperature of the single drive system slim speaker assembly 10 that does not include the heat sink 700 has risen to 200 ° C. or more when driven for a long time, but the single drive system including the heat sink 700 and the frame 500 according to the present embodiment. The temperature of the slim speaker assembly 10 was maintained at 120 ° C. or less even after driving for a long time.

The speaker assembly 10 including the heat sink 700 and the frame 500 according to the present exemplary embodiment may be used in an audio output module of an image device such as a TV or a monitor including an image output module and an audio output module. . In addition, the speaker assembly 10 including the heat sink 700 and the frame 500 according to the present embodiment may be used in a communication device such as a smartphone, a tablet PC, and the like including a communication module and an audio output module.

10 speaker assembly 12 diaphragm assembly
14 frame assembly 100 diaphragm
200: Edge 300: Suspension
400: voice coil 500: frame
600: magnetic circuit 700: heat sink
800: radiator

Claims (14)

A rectangular loudspeaker assembly having a flat diaphragm and having a length in the long axis direction of at least three times the length in the short axis direction, the diaphragm generating sound pressure by vibration, and connecting the diaphragm and the fixed end to each other. A diaphragm assembly comprising an edge,
The diaphragm may include a vibrating surface having an edge portion; Extension portions each extending outward from at least a portion of the edge portion near both ends of the long axis of the vibration surface, the ends of which are not fixed to the fixed end; And viscoelastic bodies respectively coupled to bottoms near both ends of the long axis of the vibrating surface.
The edge may include an inner fixing part fixed to an edge portion of the diaphragm; An outer fixing part fixed to the fixing end; And a connection part connecting the inner fixing part and the outer fixing part.
The method according to claim 1, wherein the viscoelastic bodies,
Diaphragm assembly, characterized in that for coupling at both ends of the diaphragm within 1/5 of the longitudinal length of the diaphragm.
The method according to claim 1, wherein the viscoelastic body,
Diaphragm assembly, characterized in that the mass of 10% to 20% of the mass of the diaphragm.
The method of claim 1, wherein the diaphragm assembly,
And a viscoelastic material applied to cover the viscoelastic material.
The method according to claim 1, The extension portion,
Diaphragm assembly, characterized in that it comprises a form in which the edge of the vibrating surface extends flat.
The method according to claim 1, The extension portion,
Diaphragm assembly characterized in that it comprises a form farther toward the connection portion formed relative to the inner fixing portion.
The method according to claim 1, The extension portion,
Diaphragm assembly characterized in that it extends to more than 1/2 of the width of the connection portion 2/3 or less.
The method according to claim 4, wherein the viscoelastic material,
Diaphragm assembly characterized in that the application is connected to the extension portion.
The method according to claim 8, wherein the viscoelastic material,
Diaphragm assembly, characterized in that applied to the upper surface of the extension and the bottom of the extension facing the connecting portion.
The method according to claim 9, wherein the viscoelastic material,
And a diaphragm assembly applied to an upper surface of the extension part facing the connection part and an inner surface of the connection part facing the extension part and filled in a space surrounded by the extension part and the connection part.
The method according to claim 1, wherein the diaphragm,
A diaphragm assembly comprising a vibration source at a central portion thereof.
The diaphragm assembly of claim 1;
A voice coil fixed to the diaphragm;
A magnetic circuit for vibrating the voice coil; And
And a frame on which the outer fixing part of the edge is fixed and the magnetic circuit is fixed.
Image output module; And
In the imaging device comprising a; audio output module, comprising:
The audio output module includes the speaker assembly of claim 12.
Communication module; And
In the communication device comprising a;
The sound output module, the communication device comprising the speaker assembly of claim 12.

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