KR102534921B1 - Suspension and speaker assembly having the same - Google Patents

Abstract

A speaker assembly according to the present invention includes a frame having a planar diaphragm, a length in a major axis direction being at least three times greater than a length in a minor axis direction, and an upper surface being open; tympanum; an edge of an elastic material coupled to an edge of the diaphragm; single voice coil; a suspension coupled to the voice coil through a lower surface, coupled to the diaphragm through an upper surface, coupled to the edge through an upper surface of an outer circumference, and coupled to an upper surface of the frame through a lower surface of an outer circumference; And a single magnetic circuit coupled to the center of the bottom surface of the frame and composed of a yoke, a magnet, and a plate; the suspension is located in the center and coupled to the voice coil through the bottom surface. 1 joint; a plurality of second coupling portions extending outwardly from the first coupling portion and coupled to a bottom surface of the diaphragm through an upper surface; a third coupling part coupled to the bottom surface of the edge through the top surface and coupled to the top surface of the frame through the bottom surface; and a plurality of resilient support portions extending from each of the second coupling portions and connected to the third coupling portion, the upper and lower surfaces of which are not coupled to other components so as to elastically support the diaphragm. .

Description

Suspension and speaker device including the same {SUSPENSION AND SPEAKER ASSEMBLY HAVING THE SAME}

The present invention relates to a rectangular speaker assembly that can be used in an imaging device or a communication device, and more particularly, to a single drive system slim speaker assembly capable of improving the sound pressure level by including a suspension that selectively reinforces the rigidity of the central portion of the diaphragm. will be.

A speaker assembly used as a component of an imaging device such as a TV or monitor has a rectangular shape with a narrow width and a long length so as to be buried in one side of a display. Typically, the length of the speaker assembly is three times or more than the width. Unlike a circular diaphragm with less division vibration problem, the diaphragm 31 of the rectangular speaker assembly 30 suffers from severe deterioration in acoustic characteristics due to division vibration at both ends in the long axis direction. Fig. 29 shows a conventional rectangular speaker used in an imaging device, and Matsushita's Japanese Patent Laid-Open No. 1989-269396 "Speaker" discloses a conventional rectangular speaker structure. The diaphragm 31 of the conventional speaker assembly 30 adopts a cone diaphragm 31 having high rigidity, so that divided vibration at both ends in the long axis direction can be alleviated.

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

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

Panasonic's Japanese Patent Laid-open Publication No. 1997-200891 "Speaker" and Panasonic's Japanese Patent Registration No. 4590403 "Speaker", Korea Topton's Korean Patent Registration No. 10-0665530 "A diaphragm applied to a rectangular slim speaker Diaphragm with" 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 diaphragm in the direction of the long axis, thereby reducing division vibration. However, first, due to the increase in the size of the voice coil, the mass of the vibration system becomes heavy, resulting in a decrease in speaker efficiency. Second, as the size of the magnet increases, the manufacturing cost of the speaker assembly increases, resulting in a decrease in price competitiveness. In particular, speaker assemblies used in imaging devices are traded at a low price of $0.5 to $1.5 per unit, and since the price of magnet parts accounts for about 30% of the manufacturing cost, the increase in price due to the increase in magnet size reduces the price competitiveness of the speaker assembly. seriously degrade.

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

Japanese Laid-Open Patent Publication No. 1998-327491 "Speaker" by Kenwood, Korean Patent Publication No. 10-2010-0011199 "Rectangular Thin Film Speaker" of Jinyoung G&T, and Korean Patent Registration No. 10-0963559 " "Slim speaker" discloses a slim speaker structure using a planar suspension. Since the flat suspension is directly coupled to the lower surface of the flat diaphragm and coupled to the upper surface of the bobbin without penetrating the bobbin, the height of the speaker assembly is reduced. For example, one type of currently commercially available slim speaker using a flat diaphragm and a flat suspension has a compact standard of 85 mm in length (L), 18 mm in width (W), and 13 mm in height.

On the other hand, as a method of reinforcing the rigidity of the flat diaphragm, which is weaker than that of the cone diaphragm, the division vibration could be somewhat alleviated by adopting a convex three-dimensional rigidity reinforcing structure. In addition, by adopting an expensive neodymium magnet instead of a cheap ferrite magnet (33, Ferrite Magnet) used in the general speaker 30, sufficient driving force can be transmitted to the diaphragm with a small magnet.

However, neodymium magnets have an advantage of providing higher magnetic force than ferrite magnets, but have a disadvantage in that demagnetization occurs in a high temperature environment due to a lower Curie temperature than ferrite magnets. In addition, neodymium magnets are expensive and have high price volatility because they are made of rare earth elements. In fact, in 2011, the price of neodymium magnets soared 11 times in a short period of time due to China's rare earth export restrictions. 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 as well as magnets increases, so manufacturing costs increase, and manufacturing processes are complicated, resulting in increased manufacturing costs and a high defect rate. .

Finally, a conventional slim speaker using a plurality of voice coils has a problem in that sound distortion occurs due to interference between vibrations because a plurality of driving systems transmit driving force to a single diaphragm.

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

Therefore, there is a demand for the development of a new single drive system slim speaker having a compact size like a conventional multiple drive system slim speaker and a simplified structure and high price competitiveness. There are three technical problems to implement a single drive system slim speaker without increasing the size of the drive system. The first is the low sound pressure level (SPL: Sound Pressure Level), the second is the split vibration problem at both ends in the long axis direction, and the third is the demagnetization problem due to high heat generation.

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

In order to overcome this problem, the diaphragm of a single drive system slim speaker has high rigidity in the center area adjacent to the vibration source to minimize vibration energy loss, and the vicinity of both ends away from the vibration source has relatively low rigidity to reduce vibration energy even with a small amount of vibration energy. It is configured to secure a single vibration displacement. Korean Registered Patent Publication No. 10-1560365 of Sleevis Co., Ltd. "Diaphragm of speaker device" discloses that the height of the concave portion formed in the center of the diaphragm increases from the center to both ends, and the height of the convex portion formed adjacent to the concave portion increases from the center to both ends. Indicates a structure that decreases as it goes to . According to this structure of the diaphragm, since the central 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 rigidity of both ends of the diaphragm is relatively low, the effect of division vibration including torsional vibration in the corresponding area increases, causing a dip problem in which the sound pressure level locally rapidly decreases in a specific area. Therefore, a structure capable of effectively suppressing torsional vibration at both ends of the diaphragm is required. Korean Patent Laid-open Publication No. 10-2016-0089264 "Vibration plate assembly" and Korean Patent Registration No. 10-1564896 "Vibration plate assembly" of Sleves Co., Ltd. disclose a diaphragm having extensions formed at both ends in the long axis direction. According to the structure of the diaphragm, the extension portion provides additional restoring force to both ends of the diaphragm and suppresses torsion, thereby mitigating the effect of division vibration of a single drive system slim speaker.

Korean Patent Registration No. 10-1737813 of Sleevis Co., Ltd. "Structure connecting the diaphragm and the edge of a slim speaker" discloses a diaphragm coated with a viscoelastic material between the edges and extensions added to both ends. According to this connection structure, the viscoelastic material applied to the extension portion of the diaphragm can effectively absorb division vibration including torsional vibration, thereby further mitigating the influence of division vibration of a single drive system slim speaker.

Next, a slim speaker with a single driving system is more vulnerable to heat generation than a slim speaker with a plurality of driving systems. For example, in a conventional multi-drive system slim speaker in which two voice coils are connected in parallel, thermal resistance is distributed to each voice coil, so that the internal temperature of the speaker rises only up to 120°C during continuous operation, whereas a single voice coil is used and there is no separate heat dissipation structure. In a single driven slim speaker, the thermal resistance is concentrated in the voice coil, so the internal temperature of the speaker rises to over 200℃ during continuous operation. As described above, the slim speaker uses a high-output neodymium magnet due to space limitations, but the neodymium magnet causes serious demagnetization in a 200°C operating environment. Therefore, there is a problem in that the output characteristics of the speaker are degraded when driving for a long time. A component speaker for an imaging device must pass a reliability test standard that examines the change in characteristics when driven at rated input for 96 hours.

In the conventional component speaker assembly, since the general speaker 30 uses a ferrite magnet that is resistant to heat, and the conventional slim speaker uses a plurality of drive systems distributing heat, a special heat dissipation structure is not considered. The speaker heat dissipation structure was mainly considered for high power speakers driven with high driving power. Compared to speakers for video equipment components, high-power speakers have fewer restrictions on space and manufacturing costs, so expensive heat dissipation materials, complex heat dissipation structures, or bulky heat sinks have been applied. There is a problem that the structure is not suitable for application to a component speaker for an imaging device with large space and manufacturing cost constraints.

Korean Patent Registration No. 10-1560363 "Speaker Device" of Sleevis Co., Ltd. discloses a speaker assembly including a radiator directly contacting the upper surface of a yoke. According to this structure, the radiator directly contacts the yoke and has an effect of quickly discharging heat inside the speaker assembly through conduction.

On the other hand, in a single drive type slim speaker, it is preferable to selectively reinforce the rigidity of the central portion of the diaphragm through a suspension in addition to the structure of the diaphragm. The suspension provides a mechanical restoring force to the diaphragm and further performs a function of reinforcing the rigidity of the diaphragm by combining with a lower surface of the diaphragm.

However, in the conventional general speaker 30, although the driving system is concentrated in the center, the rigidity of the cone-shaped diaphragm 31 is high, so that relatively sufficient vibration energy is transmitted to both ends of the diaphragm 31, and the conventional multi-drive system slim speaker has low rigidity. Although a flat diaphragm is used, relatively sufficient vibration energy is transmitted to both ends of the diaphragm because the two driving systems are disposed adjacent to both ends of the diaphragm. Therefore, in the conventional rectangular speaker device, there is no need to selectively improve the rigidity of the central portion of the diaphragm.

Japanese Laid-Open Patent Publication No. 1998-094092 "Damper for Speaker" by Pioneer, Japanese Laid-Open Patent Publication No. 1999-146488 "Cone Speaker Unit, Speaker System and Display Device, Stereo Device, Vehicle Stereo Device" by Panasonic, Japan Japanese Laid-Open Patent Publication No. 2000-244997 "Speaker" and Panasonic's Japanese Laid-Open Patent Publication No. 2006-324769 "Damper, Diaphragm and Speaker Apparatus" disclose a butterfly damper used for a cone-shaped diaphragm. The butterfly damper replaces the conventional corrugated damper of fabric material, and is formed of a plate material such as metal similar to a suspension. However, since the butterfly damper penetrates the bobbin and is used for a cone-shaped diaphragm, it is not coupled to the bottom of the diaphragm. Therefore, the butterfly damper cannot selectively improve the rigidity of the central portion of the planar diaphragm.

MSonic's Korean Patent Registration No. 10-1312931 "Speaker Suspension" discloses a suspension used for a multi-drive system slim speaker. According to this suspension structure, since the suspension is not coupled to the central portion of the diaphragm but only coupled to the vicinity of both ends, it is not suitable for use in a single drive system slim speaker.

Korean Patent Registration No. 10-0963559 of Bumjin I&D "Slim Speaker" and Korean Patent Registration No. 10-1061550 of Jinyoung G&T "Rectangular Suspension and Speaker Module Using the Same" are different Suspension of the form is disclosed. According to this suspension structure, as shown in FIG. 30, the suspension is coupled to the lower surface of the central portion of the diaphragm, but the stiffness of both ends of the diaphragm is more reinforced than that of the central portion of the diaphragm because the voice coil seating portion and reinforcing structures of the suspension are coupled near both ends of the diaphragm. there is a problem

Korean Patent Publication No. 10-2014-0146756 of Mototech "Suspension and speaker device including the same" and Korean Patent Registration No. 10-1625932 of Sleevis Co., Ltd. "Suspension for speaker device and speaker device using the same" Disclosed is a suspension used for a single drive system slim speaker. According to this structure, as shown in FIG. 32 , since the voice coil coupling part 61 is coupled to the central portion of the diaphragm, the rigidity of the central portion of the diaphragm can be somewhat increased. However, there is a problem in that the rigidity of the central portion of the diaphragm cannot be sufficiently reinforced with only the voice coil coupler 61 . In addition, since the elastic support part 62, which is not coupled to the diaphragm and the frame, is directly connected to the voice coil coupler 61 from the frame coupling part 63, the elastic support part 62 does not contribute to reinforcing the rigidity of the central portion of the diaphragm.

Japanese Unexamined Patent Publication No. 1989-269396 Japanese Unexamined Patent Publication No. 1997-200891 Japanese Patent Registration No. 4590403 Korean Registered Patent Publication No. 10-0665530 Korean Utility Model Publication No. 20-1989-0001812 Japanese Unexamined Patent Publication No. 1989-027399 Japanese Patent Registration No. 3613881 Japanese Unexamined Patent Publication No. 1998-327491 Korean Patent Publication No. 10-2010-0011199 Korean Registered Patent Publication No. 10-0963559 Korean Patent Registration No. 10-1560365 Korean Patent Publication No. 10-2016-0089264 Korean Registered Patent Publication No. 10-1564896 Korean Patent Registration No. 10-1737813 Korean Patent Registration No. 10-1560363 Japanese Unexamined Patent Publication No. 1998-094092 Japanese Unexamined Patent Publication No. 1999-146488 Japanese Unexamined Patent Publication No. 2000-244997 Japanese Unexamined Patent Publication No. 2006-324769 Korean Registered Patent Publication No. 10-1312931 Korean Registered Patent Publication No. 10-1061550 Korean Patent Publication No. 10-2014-0146756 Korean Registered Patent Publication No. 10-1625932

In the speaker assembly according to the present invention, the rigidity of the central region of the diaphragm is selectively reinforced through a suspension including a rigidity reinforcing part that extends from the voice coil coupling part and is connected to the elastic support part and is coupled to the bottom surface of the diaphragm to form a single driving system slim speaker. It aims to increase the sound pressure level and mitigate the effects of split vibration.

The suspension of the speaker assembly according to the present invention uses a planar diaphragm, is used in a rectangular speaker assembly in which the length in the major axis direction is at least three times the length in the minor axis direction, is combined with the frame and the diaphragm, and is located in the center. , a single first coupling part coupled to the voice coil through the bottom surface; a plurality of second coupling portions extending outwardly from the first coupling portion and coupled to a bottom surface of the diaphragm through an upper surface; a third coupling part coupled to the bottom surface of the edge through the top surface and coupled to the top surface of the frame through the bottom surface; and a plurality of resilient support portions extending from each of the second coupling portions and connected to the third coupling portion, the upper and lower surfaces of which are not coupled to other components so as to elastically support the diaphragm. .

In the suspension of the speaker assembly according to an embodiment of the present invention, the second coupling part is characterized in that it is formed with a shorter length than the length of the elastic support part.

In the suspension of the speaker assembly according to an embodiment of the present invention, the second coupling part is characterized in that it has a length of 5% to 15% of the length of the long axis direction of the suspension.

In the suspension of the speaker assembly according to an embodiment of the present invention, the elastic support portion is characterized in that 10% to 25% of the length of the long axis direction of the suspension.

In the suspension of the speaker assembly according to an embodiment of the present invention, the second coupling part includes a pair of second coupling parts extending in one direction of the long axis direction, and a pair of second coupling parts extending in the other direction of the long axis direction. It is composed of coupling parts, and the elastic support part is characterized in that it consists of four elastic support parts each extending from the four second coupling parts.

In the suspension of the speaker assembly according to an embodiment of the present invention, the distance between the pair of second coupling parts facing each other is characterized in that the distance between the pair of elastic support parts facing each other is narrower.

The suspension of a speaker assembly according to an embodiment of the present invention uses a flat diaphragm, is used in a rectangular speaker assembly in which the length in the major axis direction is at least three times the length in the minor axis direction, and is coupled to a frame and a diaphragm, A single first coupling part located in the center and coupled to the voice coil through a bottom surface; a plurality of second coupling portions extending outwardly from the first coupling portion and coupled to a bottom surface of the diaphragm through an upper surface; a third coupling part coupled to the bottom surface of the edge through the top surface and coupled to the top surface of the frame through the bottom surface; and a plurality of resilient support portions extending from the first coupling portion and connected to the third coupling portion, the upper and lower surfaces of which are not coupled to other components so as to elastically support the diaphragm. .

A speaker assembly according to the present invention includes a frame having a planar diaphragm, a length in a major axis direction being at least three times greater than a length in a minor axis direction, and an upper surface being open; tympanum; an edge of an elastic material coupled to an edge of the diaphragm; single voice coil; a suspension coupled to the voice coil through a lower surface, coupled to the diaphragm through an upper surface, coupled to the edge through an upper surface of an outer circumference, and coupled to an upper surface of the frame through a lower surface of an outer circumference; And a single magnetic circuit coupled to the center of the bottom surface of the frame and composed of a yoke, a magnet, and a plate; the suspension is located in the center and coupled to the voice coil through the bottom surface. 1 joint; a plurality of second coupling portions extending outwardly from the first coupling portion and coupled to a bottom surface of the diaphragm through an upper surface; a third coupling part coupled to the bottom surface of the edge through the top surface and coupled to the top surface of the frame through the bottom surface; and a plurality of resilient support portions extending from each of the second coupling portions and connected to the third coupling portion, the upper and lower surfaces of which are not coupled to other components so as to elastically support the diaphragm. .

In the speaker assembly according to an embodiment of the present invention, the second coupling portion is characterized in that formed to a length shorter than the length of the elastic support portion.

In the speaker assembly according to an embodiment of the present invention, the second coupling part is characterized in that it has a length of 5% to 15% of the length of the longitudinal axis of the suspension.

In the speaker assembly according to an embodiment of the present invention, the elastic support portion is characterized in that 10% to 25% of the length of the long axis direction of the suspension.

In the speaker assembly according to an embodiment of the present invention, the second coupling portion includes a pair of second coupling portions extending in one direction of the long axis direction, and a pair of second coupling portions extending in the other direction of the long axis direction. , and the elastic support part is characterized in that it is composed of four elastic support parts each extending from the four second coupling parts.

In the speaker assembly according to an embodiment of the present invention, the distance between the pair of second coupling parts facing each other is characterized in that it is formed narrower than the distance between the pair of elastic support parts facing each other.

In the speaker assembly according to an embodiment of the present invention, the diaphragm includes a flat edge portion and a vibration surface connected at the edge portion, and the vibration surface includes a concave portion formed in a long axis direction and the concave portion. It is configured to include a convex portion connecting the edge portion, and the second coupling portions are characterized in that each engages with the bottom surface of the edge portion of the diaphragm.

An imaging device according to the present invention includes a video output module; and a sound output module, wherein the sound output module includes a speaker assembly according to the present invention.

A communication device according to the present invention includes a communication module; and a sound output module, wherein the sound output module includes a speaker assembly according to the present invention.

In the speaker assembly according to the present invention, the rigidity of the central region of the diaphragm is selectively reinforced through a suspension including a rigidity reinforcing part that extends from the voice coil coupling part and is connected to the elastic support part and is coupled to the bottom surface of the diaphragm to form a single driving system slim speaker. It increases the sound pressure level and provides the effect of mitigating the effects of split vibration.

1 is a top view of a speaker assembly according to an embodiment of the present invention;
2 is a view showing a bottom surface of a speaker assembly according to an embodiment of the present invention;
3 is a view showing a coupled state of a speaker assembly according to an embodiment of the present invention.
4 is a diagram showing components of a speaker assembly according to an embodiment of the present invention;
5 is a view showing an upper surface of a diaphragm according to an embodiment of the present invention;
6 is a view showing a bottom surface of a diaphragm according to an embodiment of the present invention;
7 is a top view of an edge according to an embodiment of the present invention;
8 is a diagram showing a bottom surface of an edge according to an embodiment of the present invention;
9 is a view showing an upper surface of an assembled state of a diaphragm and an edge according to an embodiment of the present invention.
10 is a view showing a bottom surface of an assembled state of a diaphragm and an edge according to an embodiment of the present invention.
11 shows a suspension according to an embodiment of the present invention;
12 is a view showing a suspension according to another embodiment of the present invention.
13 is a view showing a suspension according to another embodiment of the present invention.
14 is a view showing a bottom surface of an assembled state of a diaphragm, an edge, and a suspension according to an embodiment of the present invention.
15 is a bottom view of a diaphragm assembly according to an embodiment of the present invention;
16 is a view showing an upper surface of a coupled state between a suspension and a bobbin according to an embodiment of the present invention.
17 is a diagram showing a soldering state of a suspension and a voice coil according to an embodiment of the present invention.
18 is a bottom view of a diaphragm assembly according to an embodiment of the present invention;
19 is a cross-sectional view of a diaphragm assembly according to an embodiment of the present invention;
20 is a top view of a frame according to an embodiment of the present invention;
21 is a diagram showing a bottom surface of a frame according to an embodiment of the present invention;
22 is a diagram showing a heat sink according to an embodiment of the present invention.
23 is a diagram illustrating a heat sink and a yoke according to an embodiment of the present invention.
24 is a top view of a frame assembly according to an embodiment of the present invention;
25 is a graph of sound pressure level versus frequency of a single drive system slim speaker assembly according to an embodiment of the present invention.
26 is a frequency versus sound pressure level graph of a single drive system slim speaker assembly using a suspension not including a second coupling part.
27 is a frequency versus sound pressure level graph of a single driven slim speaker using a diaphragm not containing a viscoelastic material.
28 is a frequency versus sound pressure level graph before and after a reliability test of a single drive system slim speaker assembly according to an embodiment of the present invention.
Fig. 29 is a top view of a conventional general speaker;
Fig. 30 is a diagram showing the suspension of a conventional multi-drive system slim speaker.
31 is a view showing a soldering state between a suspension and a voice coil of a conventional multi-drive system slim speaker.
Fig. 32 is a diagram showing the suspension of a conventional single drive system slim speaker.

Terms used in this specification are as follows. As shown in FIG. 1, "rectangular" means a rectangle, track shape, or elliptical shape having a major axis in the length (L) direction and a minor axis in the width (W) direction. The "long axis" means an imaginary axis in the length (L) direction of the speaker assembly, and the "short axis" means an imaginary 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" refers to the outermost side formed short in the direction of the short axis, and may be a curved shape in the example of the track shape as shown in FIG.

"Upper side" means a direction in which the vibration plane of the diaphragm faces in the speaker assembly of FIG. 1 . "Lower side" means a direction in which the yoke bottom faces in the speaker assembly of FIG. 2 . "Upper surface" means a surface facing "upper side" in a state in which the speaker is assembled. The "bottom surface" is a surface opposite to the "top surface" and refers to a surface facing "lower side" in a state in which the speaker is assembled.

"Voice coil" means the voice coil itself in which electricity is conducted and electromagnetic force acts in the electrical description, but in the structural description, it means a voice coil and a bobbin on which the voice coil is wound.

"General speaker" or "general speaker assembly" refers to a speaker assembly using a rectangular and cone-shaped diaphragm and a damper that penetrates and couples to a voice coil. A “slim speaker” or “slim speaker assembly” means a speaker assembly using a rectangular and flat diaphragm and a suspension coupled to the bottom of the diaphragm without passing through a voice coil.

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

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

[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. As shown in FIG. 15 , 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. 24, the frame 500 and the magnetic circuit 600 constitute a frame assembly 14 that does not vibrate even when the voice coil 400 vibrates. In the case of an embodiment further including a heat sink 700 and/or a radiator 800, the heat sink 700 and/or the radiator 800 may form the frame assembly 14.

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

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

2 shows a bottom side of a speaker assembly 10 according to an embodiment of the present invention. A yoke 610 is coupled to the bottom surface of the frame 500 of the speaker assembly 10 . The bottom surface 510 of the frame 500 preferably improves the heat dissipation performance of the speaker assembly 10 by exposing the bottom surface of the yoke 610 . Depending on the embodiment, a 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, thereby extending the structure of the speaker assembly 10. It is desirable to improve the heat dissipation performance.

Depending on the embodiment, it is preferable that the speaker assembly 10 further includes a radiator 800 to improve heat dissipation performance.

3 and 4 show a coupled state of the speaker assembly 10 according to an embodiment of the present invention. A speaker assembly 10 according to the present invention includes 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 an inner magnet composed of a yoke 610, a magnet 620 disposed at the center of the yoke 610, and a plate 630 disposed above the magnet 620. However, depending on the embodiment, the magnetic circuit 600 is an outer shape composed of a center pole, an annular magnet positioned around the center pole, and an annular plate disposed on the magnet, or a magnet 620 on the inside and outside of the voice coil 400 ) may be a composite type in which are arranged.

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

[tympanum]

5 shows a top surface of the diaphragm 100 according to an embodiment of the present invention. The planar shape of the diaphragm 100 is composed of a rectangular shape having a major axis (x) and a minor axis (y), and may be, for example, a rectangular shape, a track shape, or an elliptical shape. The cross-sectional shape of the diaphragm 100 according to the present invention is composed of a substantially planar shape. Compared to cone diaphragms and dome diaphragms having three-dimensional shapes, the flat diaphragm 100 has lower rigidity, but the height of the speaker assembly 10 can be reduced. The material of the diaphragm 100 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 vibrating surface 130 may further include a concave portion 132 and a convex portion 134 for rigidity reinforcement. As shown in FIG. 5 , the diaphragm 100 preferably has a rigidity reinforcing structure in which a difference in height between the convex portion 134 and the concave portion 132 decreases toward the outside in the long axis direction (x) from the center. According to this structure, division vibration can be alleviated by increasing the stiffness of the diaphragm 100, and since the stiffness of the central portion is higher than that of both ends in the long axis direction (x), it is particularly suitable for improving the sound pressure level of a single drive system slim speaker.

As shown in FIG. 5 , the diaphragm 100 may further include extension parts 120 extending outward from the edge parts 110 at both ends in the long axis direction (x). The extension part 120 is fixed to a fixed end such as the frame 500, as disclosed in Korean Patent Publication No. 10-2016-0089264 and Korean Patent Registration No. 10-1564896, or Korean Patent Publication No. 10-1737813 As disclosed in the call, it can be configured not to be fixed to a fixed end such as the frame 500.

The extension 120 may have a shape bent downward, a shape extended horizontally, or a shape bent upward, as shown in FIG. 5 , depending on desired acoustic characteristics. The extension part 120 of the diaphragm 100 provides an effect of improving acoustic performance by mitigating division vibration such as torsional vibration that may occur at both ends in the long axis direction (x).

6 shows a bottom surface of the diaphragm 100 according to an embodiment of the present invention. On the bottom surface of the diaphragm 100, the concave portion 132 has an opposite convex shape and the convex portion 134 has an opposite concave shape. Meanwhile, as shown in FIG. 14 , the lower surface of the edge portion 110 and the lower surface of the central area of the concave portion 132 preferably have the same height in order to attach the planar suspension 300 .

[edge]

7 shows a top view of edge 200 according to an embodiment of the present invention. The edge 200 is formed in a ring shape so that the vibrating surface 130 of the diaphragm 100 is exposed through the central portion, and includes an inner fixing part 210, an outer fixing part 220, and a connection part 230. The outer fixing part 220 is fixed to the frame 500, and the inner fixing part 210 is fixed to the edge part 110 of the diaphragm 100 so that the edge 200 is connected to the diaphragm 100 through the elasticity of the connection part 230. ) to perform a function of providing a restoring force to the diaphragm 100 by elastically supporting the diaphragm 100 . The material of the edge 200 is not particularly limited, and for example, an elastic material such as thermoplastic polyurethane (TPU), nitrile butadiene rubber (NBR), natural rubber, or silicone may be used.

8 shows a bottom surface of edge 200 according to an embodiment of the present invention. As shown in FIG. 19, the bottom surface of the inner fixing part 210 may include a flat surface to be combined with the upper surface of the edge of the diaphragm 100, and the bottom surface of the outer fixing part 220 may include a flat surface so that the frame ( 500 may be coupled to the upper surface of the third coupling part 340, which is the edge of the suspension 300 fixed to the suspension 300. As shown in FIG. 7 , the connecting portion 230 may be formed in a roll shape convex upward. Depending on the embodiment, it may be a reverse roll type having a downwardly convex shape or a wrinkle type formed by connecting a plurality of convex portions 134 .

FIG. 9 shows a top view of a coupled state between the diaphragm 100 and the edge 200, and FIG. 10 shows a bottom view of a coupled state between the diaphragm 100 and the edge 200. 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 present invention. The suspension 300 provides a function of providing 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 the external circuit. It can perform multiple functions.

Compared to 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 there is a difference in that the suspension 300 is coupled to the upper surface of the bobbin 410 through the lower surface. Due to this difference, the damper 32 of the conventional general speaker 30 provides restoring force to the diaphragm through a bobbin, whereas the suspension 300 of the slim speaker directly provides the restoring force to the diaphragm 100.

The suspension 300 may perform a function of providing 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 a complex manner.

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 surface of the diaphragm 100, a portion is coupled to the upper surface of the sidewall of the frame 500, which is a fixed end, and a portion The area provides elastic force to the diaphragm 100 without coupling with other components.

The division vibration may be alleviated by additionally reinforcing the rigidity of the diaphragm 100 through a portion of the suspension 300 coupled to the lower surface of the diaphragm 100 . It is preferable that the suspension 300 increases the sound pressure level of the single driving system slim speaker by selectively reinforcing only the center area 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 made of an insulating material. In addition, as shown in FIG. 12, the suspension 300 divided symmetrically about the long axis (x) may be configured to be electrically connected to both ends of the voice coil 400, respectively. An electrode unit 350 may be formed at an end in the long axis direction (x) to receive an audio signal from an external circuit. As shown in FIG. 1 , the electrode unit 350 may be configured to be exposed to the outside in an assembled state.

The electrode units 350 adjacent to each other may further include connection pieces 352 as shown in FIG. 13 . The connection piece 352 serves to increase assembly convenience by connecting the divided suspensions 300 in the assembly process, and after the assembly of the diaphragm 100, the connection pieces 352 so that the divided suspensions 300 function as electrical paths, respectively. ) can be removed.

The suspension 300 used in a slim speaker with many spatial limitations is formed in a substantially flat shape. The material of the suspension 300 is not particularly limited, and a metal material such as SUS (Steel Use Stainless) or phosphor bronze or FPCB may be used in consideration of electrical conductivity, elasticity, and manufacturing cost.

Suspension 300 can be implemented in various forms. FIG. 11 shows 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. 13 shows an embodiment in which the elastic support part 330 is directly connected to the first coupling part 310 and the vibration plate is connected to the first coupling part 310 through the second coupling part 320 reinforcing (100) shows an embodiment in which the second coupling portion 320 reinforcing the rigidity of the central portion extends separately from the elastic support portion 330 from the first coupling portion 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 coupler 310 is coupled to at least a portion of the top surface of the voice coil 400 or the top surface of the bobbin 410 on which the voice coil 400 is wound through at least a portion of the bottom surface, and the vibrating surface 130 through the top surface. Combined with part of the bottom. In the case of a single driving system slim speaker assembly 10, the first coupling part 310 is located in the center of the suspension 300. Through this structure, the first coupler 310 fixes the voice coil 400 and couples the central part of the suspension 300 to the vibrating surface 130 .

Meanwhile, in an embodiment in which the vibrating surface 130 includes a rigidity reinforcing structure such as a concave portion 132 and a convex portion 134, the bottom surface of the diaphragm 100 is not flat due to the concave portion 132 and the convex portion 134. Since the edge 110 of the diaphragm 100 and the first coupling portion 310 of the suspension 300 intersect and the bottom surface of the concave portion 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 lower surface of the diaphragm 100 by a fixing means such as an adhesive at a point where the portions 310 intersect.

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

The third coupling part 340 forms the outermost part of the suspension 300 . The planar shape of the third coupling portion 340 may be configured to have the same planar shape as that of the outer fixing portion 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 coupled to the top surface of the frame 500 through the bottom surface. Specifically, the third coupling part 340 is coupled to the outer fixing part 220 of the edge 200 through the upper surface and coupled to the upper surface of the sidewall of the frame 500 through the lower surface. Electrode units 350 may be further formed at both ends of the third coupling unit 340 in the long axis direction (x).

The elastic support portion 330 extends from the first coupling portion 310 and is formed to be connected to the third coupling portion 340, and the top and bottom surfaces of the elastic support portion 330 elastically support the diaphragm 100 and are not coupled with other components. The elastic support part 330 is located below the connection part 230 of the edge 200 having an upwardly convex shape, and provides an appropriate mechanical restoring force to the diaphragm 100 without interfering with other parts when the diaphragm 100 vibrates. do As shown in FIG. 11, the elastic support unit 330 may consist of 4 pieces or 2 pieces. The number, shape, and length of the elastic supports 330 may be selected according to the acoustic characteristics required for the speaker assembly 10 and the compliance required for the suspension 300 .

12 shows a suspension 300 according to the present invention. The suspension 300 is used in a rectangular speaker assembly 10 in which a planar diaphragm 100 is used and the length in the major axis direction (x) is at least three times greater than the length (y) in the minor axis direction. The suspension 300 is coupled to the frame 500 and the diaphragm 100 .

The suspension 300 includes a first coupling portion 310 , second coupling portions 320 , third coupling portions 340 and elastic support portions 330 . As shown in FIG. 15, the first coupling part 310 is located in the center and consists of a single first coupling part 310 coupled to the voice coil 400 through a bottom surface.

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

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, the area adjacent to the third coupling part 340 is It is preferable to form a straight line to further increase an area coupled to the edge portion 110 of the vibrating surface 130 while providing additional rigidity to the center of the vibrating surface 130 by the first coupling portion 310 .

The second coupling portions 320 extend outward from the first coupling portion 310 and, as shown in FIG. 14 , engage the bottom surface of the diaphragm 100 through the top surface. In particular, as shown in FIGS. 5 and 6, the diaphragm 100 includes a flat edge 110 and a vibration surface 130 connected at the edge 110, and the vibration surface 130 is formed in the long axis direction. When configured to include 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 shown, each of the diaphragm 100 may be configured to be coupled with the bottom surface of the edge portion 110.

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 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 and are connected to the third coupling part 340, and the top and bottom surfaces of the diaphragm 100 are not coupled to other components to elastically support the diaphragm 100.

As shown in FIG. 12, the second coupling portion 320 extends in one direction of the long axis direction (x) and a pair of second coupling portions 320 extending in the other direction of the long axis direction (x). When composed of a pair of second coupling portions 320, the elastic support portion 330 is composed of four elastic support portions 330 extending from the four second coupling portions 320, respectively. At this time, the distance between the pair of second coupling parts 320 facing each other is narrower than the distance between the pair of elastic support parts 330 facing each other.

When the length (L ₁ ) of the second coupling part 320 is increased, the stiffness of the diaphragm (100) increases, and when the length (L ₂ ) of the elastic support part 330 is increased, the compliance of the speaker is increased. do. On the other hand, as shown in FIG. 12, _{the length (L 1 ) of the second coupling part 320 and the length (L 2 )} of the elastic support part 330 in the limited length (L _sus ) of the entire suspension 300 are trade-off with each other (trade off) relationship. Therefore, it is important to select an appropriate length.

Unlike the diaphragm of a general speaker in which piston vibration is advantageous, in the diaphragm 100 of a single drive system slim speaker to which the present invention is applied, it is preferable to selectively reinforce the rigidity of the central portion of the diaphragm instead of the entire diaphragm. Therefore, if the length (L ₁ ) of the second coupling portion 320 attached to the diaphragm 100 is too long, the overall rigidity of the diaphragm 100 increases, and thus the acoustic characteristics deteriorate. Therefore, the length (L ₁ ) of the second coupling part 320 is preferably shorter than the length (L ₂ ) of the elastic support part 330 . Acoustic characteristics test results for the suspension 300 of various shapes The length (L ₁ ) of the second coupling part 320 is 5% to 15% of the length (L _sus ) in the long axis direction (x) of the suspension 300 It is preferable, and the length (L ₂ ) of the elastic support part 330 is preferably 10% to 25% of the length (L _sus ) of the long axis direction (x) of the suspension 300 .

25 shows 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 a second coupling part 320, and FIG. A sound pressure level graph of a single driving system slim speaker using the suspension 300 according to the embodiment of FIG. 11 not including the coupling part 320 is shown. It is confirmed that the suspension 300 including the second coupling part 320 flattens the acoustic characteristics of the speaker assembly 10 by selectively reinforcing the rigidity of the center of the diaphragm 100 .

The speaker assembly 10 including the suspension 300 according to the embodiment of FIG. 12 uses a planar diaphragm 100, and the length in the major axis direction (x) is at least three times or more than the length in the minor axis direction (y). is formed by The speaker assembly 10 includes a frame 500, a diaphragm 100, an edge 200, a single voice coil 400, a suspension 300, and a single magnetic circuit 600.

The speaker assembly 10 is used for a sound output module of a video device such as a TV or a monitor including a video output module and a sound output module, or a communication module including a communication module and a sound output module such as a smartphone, tablet PC, laptop PC, etc. It can be used in the sound output module of the device.

The suspension 300 according to the embodiment of FIG. 13 includes a first coupling portion 310, a second coupling portion 320, a third coupling portion 340, and an elastic support portion 330. The first coupler 310 is coupled to at least a portion of the top surface of the voice coil 400 or the top surface of the bobbin 410 on which the voice coil 400 is wound through at least a portion of the bottom surface, and the vibrating surface 130 through the top surface. Combined with part of the bottom of the In the case of a single driving system slim speaker assembly 10, the first coupling part 310 is located in the center of the suspension 300. Through this structure, the first coupler 310 fixes the voice coil 400 and couples the central portion of the suspension 300 to the vibrating surface 130 .

The second coupling portion 320 extends outward from the first coupling portion 310 and engages with the bottom surface of the edge portion 110 of the diaphragm 100 to selectively reinforce the rigidity of the central portion 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 . The second coupling portion 320 may be formed to extend to the inside of the first coupling portion 310 as shown in FIG. 13 according to an embodiment.

The third coupling part 340 is coupled to the bottom surface of the edge 200 through the top surface and 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 . Specifically, the third coupling part 340 is coupled to the outer fixing part 220 of the edge 200 through the upper surface and coupled to the upper surface of the sidewall of the frame 500 through the lower surface. Electrode units 350 may be further formed at both ends of the third coupling unit 340 in the long axis direction (x).

The elastic support portion 330 extends from the first coupling portion 310 and is formed to be connected to the third coupling portion 340, and the top and bottom surfaces of the elastic support portion 330 elastically support the diaphragm 100 and are not coupled with other components. The elastic support part 330 is located under the connection part 230 of the edge 200 having an upwardly convex shape, and functions to provide an appropriate mechanical restoring force to the diaphragm 100 without interfering with other parts when the diaphragm 100 vibrates. do As shown in FIG. 13, the elastic support unit 330 may consist of four or two. The number, shape, and length of the elastic supports 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 Catch Groove]

The voice coil 400 or the bobbin 410 is attached to the lower surface of the suspension 300, and as shown in FIG. 3, the magnetic gap between the outer wall of the plate 630 of the magnetic circuit 600 and the inner wall of the yoke 610 located between Hereinafter, as shown in FIG. 12 , an embodiment in which the first coupler 310 includes the locking groove 311 for aligning the voice coil 400 will be described in detail.

The assembly of the voice coil 400 involves the bonding process of attaching the upper surface of the bobbin 410 to the lower surface of the first coupling part 310 of the suspension 300 and the divided parts of the suspension 300 at both ends of the voice coil 400. It consists of a soldering process of soldering to each. The soldering process is a process with high assembly difficulty because the end of the voice coil 400 having a very thin wire diameter is soldered.

Meanwhile, referring to FIGS. 30 and 31, a conventional voice coil assembling process will be described. The operator assembles the bobbin and the suspension 40 by combining the first jig on which the bobbin is placed with the upper surface facing upward and the second jig on which the suspension 40 is placed so that the upper surface faces upward. Thereafter, the suspension 40 and the bobbin assembly are removed from the assembly jig, and the assembly is turned over so that the bottom surface of the bobbin faces upward. Next, as shown in FIG. 30 , after hooking the end of the voice coil 50 to the stopper 41 of the suspension 40, the lower surface of the stopper 41 is soldered. At this time, since the soldering area 52 is located on the bottom surface of the suspension 40 instead of the upper surface, the workpiece has to be turned over several times, which reduces the assembly efficiency of the operator.

In addition, the soldering area 52 is spaced apart from the voice coil coupling portion, and as shown in FIG. 31 , the end portion 51 of the voice coil 50 is diagonally connected. On the other hand, the tension applied to the voice coil 51 is constantly changed due to the divided vibration of the diaphragm or the suspension 40, and the voice coil 51 is disconnected due to stress, thereby reducing the reliability of the speaker assembly.

The suspension 300 according to the embodiment of the present invention including the locking groove 311 is formed in a flat shape. The suspension 300 according to the present embodiment includes a first coupling part 310 coupled to the upper surface of the bobbin 410 on which the voice coil 400 is wound through the lower surface. The first coupler 310 includes an extension area 313 . The extension area 313 is formed by extending beyond the outer diameter of the bobbin 410 indicated by a broken line in FIG. 16 . This extended area 313 also provides an effect of reinforcing the upper surface of the bobbin 410 in the bonding process of the bobbin 410 .

The extension area 313 further includes a catching groove 311, and the catching groove 311 spans the end of the voice coil 400 that is not wound around the bobbin 410, as shown in FIGS. 16 and 17. performs a losing function. The locking groove 311 is preferably formed in a shape of a groove dug inward by the outer diameter of the bobbin 410 at the outer periphery of the expansion area 313 .

Since the ends of the voice coil 400 are straight along the bobbin 410, a change in tension does not occur even when the diaphragm 100 or the suspension 300 divides and vibrates. Therefore, according to this embodiment, there is an effect of improving the reliability of the speaker assembly 10 by reducing the possibility of disconnection of the voice coil 400 .

On the other hand, it is more preferable in terms of process efficiency that the soldering position is the top surface of the suspension 300 instead of the bottom surface. In this case, the operator can solder the voice coil 400 while the workpiece is coupled to the assembly jig without having to remove the workpiece from the assembly jig or turn the workpiece upside down. To this end, the first coupling part 310 preferably further includes a soldering part 312 extending inwardly of the bobbin 410 as shown in FIG. 17 . Meanwhile, the soldering part 312 is preferably formed adjacent to the area where the locking groove 311 is formed.

Since the solder having a certain height is located on the upper surface of the soldering part 312, the upper surface of the soldering part 312 should not be adhered to or adhered to the bottom surface of the diaphragm 100. For example, in a rectangular speaker assembly 10 in which the length in the major axis direction (x) is at least three times greater than the length in the minor axis direction (y), the diaphragm 100 is flat as shown in FIGS. 5 and 6 It is composed of a formed edge portion 110 and a vibrating surface 130 connected to the edge portion 110, and the vibrating surface 130 includes a concave portion 132 formed in the long axis direction (x) and the concave portion 132 and In the case of including the convex portion 134 connecting the edge portion 110, the soldering portion 312 may be configured to be located below the convex portion 134 as shown in FIG.

Since one voice coil 400 has two ends, only two locking grooves 311 can be formed. However, in this case, there is an unfavorable problem in process management because the suspension 300 has a directionality. In order to solve this problem, the first coupling part 310 is preferably configured to include four locking grooves 311 as shown in FIG. 17 . Even in the embodiment including the soldering part 312, the first coupling part 310 may include only two soldering parts 312, but as shown in FIG. 17, it further includes four soldering parts 312. It is preferable to configure According to this embodiment, there is an effect that the voice coil can be soldered at the same position even when the suspension is overturned or rotated 180 degrees in the assembly process.

The suspension 300 including the locking groove 311 according to the present embodiment is not limited to the rectangular speaker assembly or the single drive system speaker assembly 10, and can be used for various speakers using a flat diaphragm and a flat suspension. For example, this embodiment may be applied to a circular or square speaker, as shown in FIG. 30, may also be applied to the suspension 300 of a conventional multi-drive system slim speaker, and as shown in FIG. 11 or 13, the elastic support unit 330 may be applied to the suspension 300 extending from the first coupling portion 310 and connected to the third coupling portion 340, and as shown in FIG. 12, the elastic support portion 330 is the second coupling portion. It may also be applied to the suspension 300 extending from 320 and connected to the third coupling part 340 .

[Example of diaphragm assembly including viscoelastic material]

Since the area of the diaphragm 100 to which the driving force is transmitted is small and the rigidity of the flat diaphragm 100 is insufficient, the single drive type rectangular slim speaker assembly 10 vibrates separately near both ends of the diaphragm 100 in the long axis direction (x). this happens badly According to the structure of the diaphragm 100 in which the viscoelastic material 150 is applied between the edge 200 and the extensions 120 added to both ends, the influence of division vibration at the end of the diaphragm 100 can be alleviated.

Meanwhile, by further adding the viscoelastic material 140 having a certain mass to both ends of the diaphragm 100, the viscoelastic material 140 can absorb the vibration at the end of the diaphragm 100, and the mass of the viscoelastic material 140 The effect of division vibration can be further alleviated by increasing the resistance to torsional vibration.

Hereinafter, an embodiment including the viscoelastic body 140 will be described with reference to FIGS. 18 and 19 . The diaphragm assembly 12 according to the present embodiment is used for a rectangular speaker assembly 10 in which the length in the major axis direction (x) is at least three times greater than the length in the minor axis direction (y). The diaphragm assembly 12 according to the present embodiment includes a planar diaphragm 100 generating negative pressure by vibration and an edge 200 connecting the diaphragm 100 and a fixed end. The fixed end is a component that does not vibrate despite the vibration of the diaphragm 100 and may be the upper end of the frame 500 or the third coupling part 340 of the suspension 300 .

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

The extensions 120 extend outward from at least a portion of the edge portion 110 near both ends of the long axis (x) of the vibrating surface 130, but their ends are not fixed to fixed ends. The extension part 120 may include a shape in which the edge of the vibrating surface 130 extends flatly 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 is further away or closer to the side. It is preferable that the width of the extension part 120 extends from 1/2 to 2/3 of the width of the connection part 230 .

The viscoelastic body 140 is coupled to the bottom surface near both ends of the long axis (x) of the vibrating surface 130, respectively. The viscoelastic material 140 has a certain 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, a foam buoy or foam urethane.

The coupling position (L ₃ ) of the viscoelastic material 140 is preferably coupled within a region of 1/5 of the length (L _DP ) of the diaphragm 100 in the long axis direction (x) at both ends of the diaphragm 100, FIG. 18 As shown in, it is more preferable to be located in the area where the extension part 120 is formed.

If the mass of the viscoelastic material 140 is too high, the mass of the vibrating system increases and the efficiency of the speaker decreases. Experimental results showed the best acoustic characteristics when the mass of the viscoelastic material 140 was 10% to 20% of the mass of the diaphragm 100.

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

In order to further alleviate the division 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 solid at room temperature, the viscoelastic material 150 exists in the form of a viscous liquid at room temperature, and may be a viscous liquid mainly composed of, for example, PVC resin or acrylic resin. Chemicals) may be exemplified by D-747.

The viscoelastic material 150 may be applied while being connected to the extension part 120 of the diaphragm 100, and may be applied to the upper surface of the extension part 120 and the lower surface of the extension part 120 facing the connection part 230. there is. Depending on the embodiment, the viscoelastic material 150 is applied to the upper surface of the extension part 120 facing the connection part 230 and the inner surface of the connection part 230 facing the extension part 120, and the extension part 120 and the connection part ( 230) can be filled in.

Meanwhile, the present embodiment including the viscoelastic material 140 can be applied to the diaphragm 100 using a plurality of vibration sources, but as shown in FIG. 18, it is applied to the diaphragm 100 having one vibration source in the central portion. It is more effective to do The vibration source at this time may be not only the voice coil 400 but also other speaker vibration sources such as a piezo element.

25 is a sound pressure level of a slim speaker using the diaphragm assembly 12 according to the embodiment of FIG. 19 including the viscoelastic material 140 and the viscoelastic material 140 applied to the extension part 120 A (SPL: Sound Pressure Level) graph is shown, and FIG. 27 is a slim speaker using a diaphragm assembly 12 that does not include the viscoelastic material 140 but includes the viscoelastic material 140 applied to the extension part 120. It shows the sound pressure level graph of It is confirmed that the diaphragm assembly 12 further including the viscoelastic body 140 further alleviates the division vibration of both ends of the diaphragm 100 and effectively removes the dip between 1 kHz and 2 kHz caused by the division vibration.

[Frame assembly]

Hereinafter, the frame assembly 14 will be described with reference to FIGS. 20 to 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 embodiments.

The magnetic circuit 600 may be an anti-magnetic circuit 600 composed of a yoke 610, a magnet 620, and a plate 630, and serves to provide magnetic force to the voice coil 400 through a magnetic gap. carry out Depending on the embodiment, the magnetic circuit 600 may be an outer magnetic circuit 600 composed of a center pole, a magnet 620, and a plate 630, or a mixed magnetic circuit 600 in which an outer magnetic type and an inner magnetic circuit are mixed. .

The frame 500 forms the outer shape of the speaker assembly 10, has an open upper surface, and is composed of a bottom surface 510 and side surfaces. The material of the frame 500 is not particularly limited, and may be, for example, polymer resin or metal. In the case of a single drive system slim speaker assembly 10, a magnetic circuit 600 is coupled to the center of the bottom surface 510. It is preferable to simplify the assembly process by injection molding the frame 500 with the yoke 610 inserted therein. In the case of an embodiment further including the heat sink 700 and/or the radiator 800, the frame 500 may be injection molded in a state in which the heat sink 700 and/or the radiator 800 are inserted.

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

On the other hand, in the single driving 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.

The frame 500 according to the present embodiment uses a planar diaphragm 100 and is a rectangular speaker assembly 10 in which the length in the major axis direction (x) is at least three times the length in the minor axis direction (y). used In addition, the frame 500 is coupled to the diaphragm assembly 12 through the upper side of the side and coupled to the yoke 610 through the bottom surface 510 .

The bottom surface 510 of the frame 500 includes a first area 520 and a second area 530 . As shown in FIG. 20 , the first area 520 is the 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 can 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 regions 530 are disposed adjacent to each other on both sides of the first region 520 in the long axis direction (x). The second region 530 includes a pair of second coupling holes 531 to which the pair of heat sinks 700 are coupled. At this time, the thermal conductivity of the heat sink 700 should be higher than that of the yoke 610 . Iron, nickel, cobalt, permalloy, and MKS steel may be exemplified as the ferromagnetic material constituting the yoke 610, and these materials have a low thermal conductivity of less than 100 W/(mㅇK). Therefore, for a high heat dissipation effect, the material of the heat sink 700 must have a high thermal conductivity of 100 W/(mㅇK) or more, and for example, graphene, silver, copper, gold, aluminum, or an alloy of a plurality of metals However, considering the manufacturing cost, it is most preferable that it is aluminum.

As shown in FIG. 3 , the second region 530 is formed to have a highest point lower than the highest point of the yoke 610 and a lowest point higher than the lowest point of the yoke 610, so that the height of the heat sink 700 At least 1/5 of the bottom surface 510 is exposed upward, and at least 1/5 of the height of the heat sink 700 is exposed below the bottom surface 510 . That is, the upper portion of the heat sink 700 is accommodated inside 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 to emit as much heat as possible.

In addition, the second region 530 of the bottom surface 510 supports the heat sink 700 in a stable manner by supporting the middle of the heat sink 700 while preventing the heat sink 700 from increasing the height of the speaker assembly 10. It can be prevented.

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

In addition, as shown in FIG. 20, the second region 530 is formed at a higher position than the first region 520, so that the bottom surface 510 of the frame 500 is low in the middle where the yoke 610 is coupled, and the heat It is preferable to have a high stair structure on both sides where the sink 700 is coupled.

Meanwhile, as shown in FIG. 3, the first region 520, in order to define the position where the heat sink 700 is coupled to the frame 500, is at least a portion of the upper surface and a portion of the lower surface of the heat sink 700. It is preferable to be formed to 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 area 540 extending from the first area 520 and connecting the second area 530, as shown in FIG. As shown in FIG. 3 , at least a portion of the third region 540 is preferably formed to contact a portion of a side surface of the heat sink 700 . The third region 540 serves to firmly support the outer surface of the central portion of the heat sink 700 to improve assembly stability of the heat sink 700 and the frame 500 .

Meanwhile, in order to improve heat dissipation, the frame 500 may further include third coupling holes 532 to which the radiator 800 is coupled. To this end, the second area 530 is disposed on both sides of the first coupling hole 521 in the long axis direction (x), and includes a pair of third coupling holes 532 to which the pair of radiators 800 are coupled. may further include

The speaker assembly 10 according to the embodiment including the heat sink 700 includes 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 planar diaphragm 100, and the length in the major axis direction (x) is at least three times greater than the length in the minor axis direction (y).

The frame 500 has an open upper surface, and the edge 200 made of an elastic material is coupled to the edge 110 of the diaphragm 100 . As the voice coil 400 is shown in FIG. 3, one is located in the middle. Compared to the case of using a plurality of voice coils 400, when a single voice coil 400 is used, resistance heat increases because power is concentrated on the single voice coil 400. The suspension 300 is coupled to the voice coil 400 through a bottom surface, a partial region is coupled to the diaphragm 100, and a partial region 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 have higher thermal conductivity than the yoke 610 , are coupled to the bottom surface 510 of the frame 500 , and are disposed adjacent to the outer circumferential surface of the yoke 610 . As shown in FIG. 23 , a portion of the heat sink 700 may receive heat from the yoke 610 because it is in contact with or disposed very close to a portion of the outer circumferential surface of the yoke 610 . As shown in FIG. 22, in the heat sink 700, a curved area 710 matching the outer circumferential surface of the yoke 610 is 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 area 520 and a second area 530 . The first region 520 is formed with a first coupling hole 521 to which the yoke 610 is coupled. A pair of second coupling holes 531 are disposed adjacent to each other on both sides of the first region 520 in the long axis direction (x), and the pair of heat sinks 700 are coupled to each other. The second region 530 is formed to have a highest point lower than the highest point of the yoke 610 and a lowest point higher than the lowest point of the yoke 610 so as to cover at least 1/5 of the height of the heat sink 700 with the bottom surface. 510 is exposed to the upper side, and at least 1/5 of the height of the heat sink 700 is exposed to the bottom surface 510 to the lower side.

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

The graph of FIG. 28 shows the sound pressure level before and after the 96-hour reliability test of the speaker system combining the speaker assembly 10 and the enclosure according to the embodiment including the heat sink 700. The solid line represents the sound pressure level before the reliability test, and the broken line represents the sound pressure level after the reliability test. As shown, it is confirmed that there is little change in characteristics despite the reliability test. On the other hand, the temperature of the single driven slim speaker assembly without the heat sink 700 rose to 200 ° C. or more during long-term driving, but the single driven slim speaker assembly including the heat sink 700 and the frame 500 according to the present embodiment. The temperature of (10) was maintained below 120 °C even during long-term driving.

The speaker assembly 10 including the heat sink 700 and the frame 500 according to the present embodiment can be used for a sound output module of a video device such as a TV or a monitor that includes a video output module and an audio output module. . In addition, the speaker assembly 10 including the heat sink 700 and the frame 500 according to this embodiment can be used in communication devices such as smart phones and tablet PCs including a communication module and a sound 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 (16)

In a suspension that uses a flat diaphragm and is used in a rectangular speaker assembly in which the length in the major axis direction is at least three times the length in the minor axis direction, and is coupled to the frame and the diaphragm,
A single first coupling part located in the center and coupled to the voice coil through a bottom surface;
a plurality of second coupling portions extending outwardly from the first coupling portion and coupled to a bottom surface of the diaphragm through an upper surface;
a third coupling part coupled to the bottom surface of the edge through the top surface and coupled to the top surface of the frame through the bottom surface; and
A plurality of elastic support units extending from each of the second coupling units and connected to the third coupling unit, the upper and lower surfaces of which are not coupled to other parts so as to elastically support the diaphragm;
The second coupling portion is composed of a pair of second coupling portions extending in one direction of the major axis direction and a pair of second coupling portions extending in the other direction of the major axis direction,
The elastic support part is composed of four elastic support parts each extending from the four second coupling parts,
The suspension of the speaker assembly, characterized in that the distance between the pair of second coupling parts facing each other is formed narrower than the distance between the pair of elastic support parts facing each other.
The method of claim 1,
Suspension of a speaker assembly, characterized in that the second coupling portion is formed to a length shorter than the length of the elastic support portion.
The method according to claim 1, wherein the second coupling part,
A suspension of a speaker assembly, characterized in that it has a length of 5% to 15% of the length of the major axis of the suspension.
The method according to claim 1, wherein the elastic support,
Suspension of a speaker assembly, characterized in that 10% to 25% of the length of the major axis of the suspension.
delete delete delete A rectangular speaker assembly in which a flat diaphragm is used and the length in the major axis direction is at least three times the length in the minor axis direction, the speaker assembly comprising:
A frame with an open upper surface;
tympanum;
an edge of an elastic material coupled to an edge of the diaphragm;
single voice coil;
a suspension coupled to the voice coil through a lower surface, coupled to the diaphragm through an upper surface, coupled to the edge through an upper surface of an outer circumference, and coupled to an upper surface of the frame through a lower surface of an outer circumference; and
A single magnetic circuit coupled to the center of the bottom surface of the frame and composed of a yoke, a magnet, and a plate; is configured to include,
The suspension may include a single first coupling part located in the center and coupled to the voice coil through a bottom surface; a plurality of second coupling portions extending outwardly from the first coupling portion and coupled to a bottom surface of the diaphragm through an upper surface; a third coupling part coupled to the lower surface of the edge through the upper surface and coupled to the upper surface of the frame through the lower surface; and a plurality of resilient support portions extending from each of the second coupling portions and connected to the third coupling portion, the upper and lower surfaces of which are not coupled to other components so as to elastically support the diaphragm,
The second coupling portion is composed of a pair of second coupling portions extending in one direction of the major axis direction and a pair of second coupling portions extending in the other direction of the major axis direction,
The elastic support part is composed of four elastic support parts each extending from the four second coupling parts,
A speaker assembly, characterized in that the distance between the pair of second coupling parts facing each other is formed narrower than the distance between the pair of elastic support parts facing each other.
The method according to claim 8, wherein the second coupling part,
Speaker assembly, characterized in that formed in a shorter length than the length of the elastic support.
The method according to claim 8, wherein the second coupling part,
A speaker assembly, characterized in that it has a length of 5% to 15% of the length of the major axis of the suspension.
The method according to claim 8, wherein the elastic support portion,
A speaker assembly, characterized in that 10% to 25% of the length of the long axis of the suspension.
delete delete The method of claim 8,
The diaphragm includes an edge portion formed flat and a vibration surface connected at the edge portion,
The vibrating surface includes a concave portion formed in a long axis direction and a convex portion connecting the concave portion and the edge portion,
The second coupling parts are coupled to the lower surface of the edge portion of the diaphragm, respectively.
video output module; and
An imaging device comprising a sound output module,
The audio output module is an imaging device comprising the speaker assembly of claim 8.
communication module; and
In the communication device comprising a; sound output module,
The communication device characterized in that the sound output module comprises the speaker assembly of claim 8.

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