KR20140115015A

KR20140115015A - Speaker device

Info

Publication number: KR20140115015A
Application number: KR1020130029520A
Authority: KR
Inventors: 심정보
Original assignee: 심정보
Priority date: 2013-03-20
Filing date: 2013-03-20
Publication date: 2014-09-30

Abstract

The present invention relates to a speaker device which converts an electrical audio signal into sound pressure through the vibration of a diaphragm. The speaker device according to the present invention includes a vibration unit including a diaphragm and a voice coil formed on the bottom surface of the edge of the diaphragm; a magnetic circuit unit supplying a magnetic field to the voice coil; a magnetic fluid bound to the magnetic field of the magnetic circuit unit; and a case unit including at least one among the vibration unit and the magnetic circuit unit. The diaphragm includes an uncoupled edge area where at least a part of the edge of the diaphragm is not coupled to the case unit. At least a part of the voice coil, the part being formed on the bottom surface of the uncoupled edge area, is supported by being in contact with the magnetic fluid.

Description

[0001] SPEAKER DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device for converting an electrical audio signal into sound pressure through vibration of a diaphragm, and more particularly, to a speaker device using a magnetic fluid as a sealing means on the front surface of a diaphragm, &Lt; / RTI >

The dynamic speaker is driven in such a manner as to vibrate a diaphragm on which the voice coil is mounted by using a voice coil to which an input current according to a voice signal is applied and an electromagnetic force acting between the permanent magnets to provide a magnetic field. The dynamic speaker is disadvantageous in that it is complicated in structure due to a vibrating part including a magnetic circuit including a magnet, a plate and a yoke, a vibration plate, a bobbin and a voice coil. However, since the structure is simple, It has been used extensively as a component speaker since it consumes less power than a speaker. However, the speaker efficiency differs depending on the shape of the diaphragm, but is generally proportional to the square of the effective vibration area of the diaphragm. Therefore, the speaker efficiency can be improved by enlarging the diaphragm to increase the effective vibration area.

&Lt; Problem of Conventional TV Speaker >

However, recent IT devices such as TVs, monitors, notebooks, tablet PCs, and smart phones have been slim to reduce mobility and ease of use and design, and the thickness of the display bezel has also become slimmer. As a result, it is required to make the height of components mounted on the IT equipment slim and downsize, and the speaker for parts is required to be slim in height and downsized in width.

1 shows a mounting structure of a component speaker 12 in the flat panel TV 10. Fig. As shown in the figure, the TV speaker 12 is mounted on the bottom surface of the flat panel TV 10 in a direction in which the diaphragm faces the bottom surface of the flat panel TV 10. In this case, the thickness w1 of the flat panel TV 10 is affected by the diaphragm width of the speaker 12, that is, the width w2 of the speaker 12. Particularly, the width of the display panel used in the flat panel TV 10 has already been reduced to several millimeters, while the width w2 of the component speaker 12 used in the flat panel TV is still 20 mm or more, It remains. In addition, since the width of the speaker 12 for mounting the flat panel TV 10 is reduced, the effective vibration area of the diaphragm is reduced, and the sound quality of the flat panel TV 10 is lowered. 12) It is difficult to miniaturize the width (w2). Therefore, in order to narrow the width w1 of the flat panel TV 10 more than the current level, a speaker device with little or no reduction in speaker efficiency is required while adopting a narrow diaphragm.

&Lt; Problem of Conventional Micro Speaker >

2 shows a mounting structure of the component speaker 22 in the smartphone 20. As shown in the figure, the micro speaker 22 used as a receiver of the smartphone 20 is mounted on the upper bezel of the smartphone 20 in a direction in which the diaphragm faces the front of the smartphone 20, i.e., the ear of the user. In this case, the thickness w3 of the upper bezel of the smartphone 20 is affected by the width of the diaphragm of the speaker 22, that is, the width w4 of the speaker 22. Parts such as an antenna, a display panel, and a battery used in the smartphone 20 have been made slimmer and smaller in accordance with technological development. However, the dynamic micro speaker is difficult to miniaturize and slim down due to the above-described complicated structure . On the other hand, unlike a TV that many people listen to, a smartphone that only listens to a user can produce a relatively small width (w4) because the required speaker efficiency is not so high. The width w4 is about 7 mm. However, in the same way as TV speakers, micro speakers are also difficult to miniaturize further due to poor sound quality. In order to minimize the thickness (w4) of the bezel of the smartphone 20, a narrow diaphragm is adopted, Less speaker units are required as well.

&Lt; Surround of conventional dynamic speaker diaphragm &

In order for a dynamic speaker to sound, the front and back of the diaphragm must be sealed to each other. If such sealing is not performed, sound corresponding to a frequency lower than the resonance frequency determined by the size of the diaphragm is generated due to the phenomenon that the sound generated from the front surface of the diaphragm and the sound opposite to the phase generated from the back surface of the diaphragm cancel each other . Therefore, the conventional dynamic speaker separates the sound generated from the front surface of the diaphragm and the sound generated from the back surface by blocking the destructive interference by attaching the rim of the diaphragm to the fixed frame or case.

On the other hand, since the diaphragm frame is fixed, the conventional dynamic speaker must include a convex surround (also referred to as an edge) in the rim. Assuming that the edge of the diaphragm is fixed and there is no surround, the entire diaphragm is partially vibrated by the fixed surface (frame), causing a problem that the desired sound pressure can not be generated. Surround functions to prevent partial vibration generated by the fixing surface and to cause the entire surface of the vibration plate to vibrate the piston.

However, since the front surface of the actual diaphragm is not an effective vibration area due to the surround added to the diaphragm, there is a problem that only a part of the area excluding the area of the surround and the area of the coupling portion where the diaphragm and the frame are engaged becomes an effective vibration area. That is, only about 70 to 80% of the total diaphragm area is an effective vibration area, and the speaker efficiency is generally proportional to the square of the area of the diaphragm.

3 shows a conventional dynamic speaker structure. The dynamic speaker includes a vibrating portion and a yoke 35 (also referred to as a pole piece) composed of a diaphragm 31, a bobbin 34 (the micro speaker does not include a bobbin), and a voice coil 33, A magnet 36, and a plate 37, and is constituted by a frame 38 or a case which forms an external shape. The diaphragm 31 is fixed to the frame so that the front surface and the rear surface of the diaphragm 31 are sealed with each other. The diaphragm 31 is provided with a restoring force by a spider 39 (also referred to as a damper) interposed between the surround 32 formed on the diaphragm 31 and the frame 38, And continuously oscillates according to the input current inputted to the coil 33. [

Fig. 4 shows the structure of a conventional TV speaker. The conventional TV speaker is composed of a magnetic circuit part constituted by a yoke 35, a magnet 36 and a frame 38 (the frame bottom functioning as a plate 37), a diaphragm 31, a bobbin 34, And the vibration part is provided with a restoring force by the vibration plate 32 and the spider 37 fixedly mounted on the frame 38. [

In this case, the effective vibration area of the dynamic speaker is not the entire area S1 of the diaphragm 31 including the area of the surround 32 and the area of the frame 38 as shown in FIG. 5, There is a problem that it is limited only by the area S2 of the inner space S2. That is, since the effective vibration area S2 is narrowed to about 70 to 80% of the entire diaphragm area S1 due to the surround 32, there is a problem that the speaker efficiency is very low. It becomes more problematic in a recent IT equipment environment requiring ultra-thin and compact as described above. As described above, in order to manufacture an IT device having a slim appearance, a narrow width of less than 7 mm, which is the limit width of a micro speaker for a smartphone, a tablet PC, or a notebook, A speaker device of a new structure capable of achieving the required sensitivity is desperately required.

On the other hand, there has been an attempt to use a magnetic fluid (ferrofluid) which is a fluid confined by a magnetic field for the purpose of improving the suspension structure that provides restoring force to the diaphragm of a dynamic speaker or aligning the voice coil so that it does not contact the magnetic field circuit . As described above, the surround of the diaphragm and the spider coupled with the frame provide this restoring force to the diaphragm.

As shown in FIG. 6, a method of making a voice coil is a suspension structure that provides a restoring force to a diaphragm 41, and a conventional surround 42 ) And a magnetic fluid (48) in addition to the spider (49). According to this structure, the magnetic fluid 48 confined to the magnetic field of the magnet 46 is disposed in the space between the yoke 45 and the plate 47, and the bobbin 44 and the voice coil 43 are magnetized with magnetic force The vibrating members 41, 42 and 43 are brought into contact with the fluid 48 to receive the restoring force by the magnetic fluid 48 and the voice coil 43 is supported so as to be separated from the magnetic circuit units 45, 46 and 47 have.

However, this structure still requires the surround 42 because the front surface and the rear surface of the diaphragm 41 are sealed through the diaphragm 41 fixed to the frame in the same manner as in the prior art. Therefore, there is a problem that the effective vibration surface area of the diaphragm 41 can not be enlarged.

On the other hand, a dynamic speaker structure using a magnetic fluid as a means for replacing a spider or a surround as an improved invention is disclosed in US Pat. No. 7,729,504 entitled "Ferrofluid centered voice coil speaker" by Shiro Tsuda et al. Fig. 7 shows the structure in which the magnetic fluid 58 replaces the spider, and Fig. 8 shows the structure in which the magnetic fluid 68 replaces the spider and the surround.

7, the magnetic fluid 58 replaces the spider in the structure of the dynamic speaker. However, since the diaphragm 51 still includes the surround 52, the effective vibration surface area of the diaphragm 51 is enlarged There was no problem.

8, since the magnetic fluid 68 replaces both the surround and the spider, the area of the effective vibration surface of the vibration plate 61 seems to be enlarged. However, there is no structure that seals the front surface and the rear surface of the vibration plate 61 It is impossible to perform a basic function as a speaker due to the phenomenon that the front and back acoustic waves of the diaphragm 61 are canceled out from each other. Due to the problem that the area of the diaphragm is unrealistically widened to several m ² or more, It is considered to be an impossible practice. Moreover, since the rim of the diaphragm does not include any supporting structure, there arises a problem that the diaphragm 61 moves to the left and right rather than up and down (yawing). Therefore, the speaker structure of Fig. 8 has a problem that it can not be employed in a speaker for a component in which the area of the diaphragm is only a few cm ² or a few mm ² .

In the case of the prior art in which a dynamic speaker is improved by using a magnetic fluid as described above, since the front and rear surfaces of the diaphragm are sealed by attaching the rim of the diaphragm to the frame like the conventional dynamic speaker, The problem of impossibility of enlarging the vibration area remains a technical challenge. In addition, as in the case of FIG. 8, since there is no structure for sealing the front and rear surfaces of the diaphragm, there is a problem that it is impossible to prevent the destructive interference between the front and back surfaces of the diaphragm.

&Lt; Problems of Diaphragm Fixing Structure of Conventional Dynamic Speaker >

The following additional problems arise due to the structure in which the diaphragm frame for shielding the front and rear of the diaphragm is fixed to the frame in addition to the "effective vibration area reduction" due to the surround structure of the conventional dynamic speaker described above.

First, the vibration displacement of the diaphragm is not uniform. Since the center of the diaphragm is relatively free, the vibration displacement becomes larger toward the center, while the vibration displacement becomes smaller toward the outer side where the diaphragm edge is fixed. The nonuniform vibration problem of the diaphragm causes the distortion of the sound generated in the diaphragm.

Second, since the rim of the diaphragm is physically coupled to the frame, there is a problem that a stronger driving force must be provided for the vibration of the diaphragm. For this reason, a magnet with a high magnetic force is required, which increases the manufacturing cost of the speaker. In addition, the height of the magnet is increased for strong magnetic force, and the increase in the height of the magnet serves as a limiting factor in the reduction of the speaker height particularly in a speaker for a component whose speaker size is minimized.

Third, the driving force of the diaphragm acts on the voice coil. If the voice coil is attached to the edge of the diaphragm having a small vibration displacement, vibration can not be sufficiently transmitted to the diaphragm. Therefore, the voice coil should be mounted close to the center of the diaphragm as shown in FIG. 3, which results in a smaller diameter of the bobbin, which in turn increases the winding height of the voice coil. The increase in the height of the voice coil serves as a limiting factor in the reduction of the speaker height particularly in the speaker for the component whose speaker size is minimized.

U.S. Patent No. 4,017,694 entitled "Method for making loudspeaker with magnetic fluid envelope the voice coil" U.S. Patent No. 7,729,504 entitled "Ferrofluid centered voice coil speaker"

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a loudspeaker apparatus in which a magnetic fluid acts as a liquid sealing, and a voice coil or a bobbin, The purpose of shielding is to prevent destructive interference due to the sound of opposite phase occurring at the back of the diaphragm.

Since the edge of the diaphragm does not engage with the frame or the case, the diaphragm does not include a surround, and the front surface of the diaphragm acts as an effective vibration area, so that the speaker device according to the embodiment of the present invention is the same as a dynamic speaker including a conventional surround Another object is to improve the speaker efficiency by increasing the speaker efficiency in the diaphragm area and to narrow the width of the speaker in the same effective vibration area as that of the conventional dynamic speaker including the surround.

The speaker device according to the embodiment of the present invention does not have a boundary area where the rim of the diaphragm does not engage with the frame or the case or minimizes the engaging portion, The other purpose is to minimize.

Since the edge of the diaphragm does not engage with the frame or the case or minimizes the engaging portion, the driving force for driving the diaphragm is reduced because there is no boundary area in which the vibration displacement is small, It improves the loudspeaker efficiency by improving the speaker efficiency in the magnet with the same output power as the fixed fixed type dynamic speaker and can reduce the magnet output at the same speaker efficiency as the conventional diaphragm fixed dynamic speaker, Another object is to reduce the height of the apparatus.

The speaker device according to the embodiment of the present invention does not have a boundary area in which the rim of the diaphragm does not engage with the frame or the case or minimizes the engaging portion and thus the vibration displacement becomes small and the vibration displacement of the entire portion is substantially the same, The height of the coil of the voice coil can be reduced to reduce the height of the speaker device.

Another object of the present invention is to provide a speaker device capable of easily adjusting the damping force of a diaphragm by adjusting the viscosity of a magnetic fluid that provides a suspension function of the diaphragm.

Another object of the present invention is to prevent contact between the voice coil and the magnetic field circuit because the voice coil is held in contact with the magnetic fluid.

Finally, another object of the present invention is to improve the heat radiation performance by absorbing heat generated from the voice coil through the structure in which the magnetic fluid surrounds the voice coil.

According to an aspect of the present invention, there is provided a speaker device comprising: a vibrating part including a diaphragm and a voice coil formed at a bottom of a diaphragm frame of the diaphragm; A magnetic field circuit for supplying a magnetic field to the voice coil; A magnetic fluid confined to the magnetic field of the magnetic circuit; And a case portion including at least one of the vibrating portion and the magnetic field circuit portion, wherein the diaphragm has a non-engagement edge region in which at least a part of the diaphragm edge is not engaged with the case portion And at least a part of the voice coil formed on a bottom surface of the unbonded edge region of the diaphragm is held in contact with the magnetic fluid.

In the speaker device according to the embodiment of the present invention, the magnetic field circuit portion may include: a yoke disposed on the lower side and the inner side of the voice coil, the yoke being spaced apart from the voice coil; A magnet which is in contact with an upper portion of the yoke and is located outside the voice coil and apart from the voice coil; And a plate disposed on the outer side of the voice coil in contact with an upper portion of the magnet and spaced apart from the voice coil, wherein the magnetic fluid is located in a region between the yoke and the plate .

In the speaker device according to the embodiment of the present invention, the magnetic field circuit portion may include: a yoke disposed on the lower side and the outer side of the voice coil so as to be spaced apart from the voice coil; A magnet placed in contact with an upper portion of the yoke and spaced apart from the voice coil inside the voice coil; And a plate which is in contact with an upper portion of the magnet and is located inside the voice coil and apart from the voice coil, the magnetic fluid being located in a region between the yoke and the plate .

In the speaker device according to the embodiment of the present invention, the magnetic circuit may include: a magnet formed on the lower side of the voice coil and spaced apart from the voice coil; A plate spaced apart from the magnet and extending beyond the height of the magnet; And a yoke which is in contact with the other side of the magnet facing one side of the magnet and is located inside the voice coil and spaced apart from the voice coil and extending beyond the height of the magnet, , And is located in a region between the yoke and the plate extending beyond the height of the magnet.

In the speaker device according to the embodiment of the present invention, the diaphragm does not include the edge.

In the speaker device according to the embodiment of the present invention, the diaphragm does not include an edge on its surface, and the non-joined edge region is the entire diaphragm frame.

In the speaker device according to the embodiment of the present invention, the voice coil is formed on the outermost bottom surface of the diaphragm frame.

In the speaker device according to the embodiment of the present invention, the vibrating portion may further include a bobbin, and the voice coil is formed on the bottom surface of the diaphragm via the bobbin.

A speaker apparatus according to an embodiment of the present invention includes: a diaphragm formed in a plane having a constant height and in which a frame region is not fixedly supported; A bobbin mounted on a lower portion of the rim region of the diaphragm; A voice coil wound on the bobbin and receiving an input current according to an audio signal; A magnetic field circuit for providing a magnetic field to the voice coil; And a magnetic fluid positioned in a magnetic field supply region of a magnetic field circuit portion for supplying the magnetic field to the voice coil and restrained by the magnetic field, wherein the voice coil or the bobbin is supported by the magnetic fluid .

In the speaker device according to the embodiment of the present invention, the distance between the plate and the yoke is smaller than the distance between the magnet and the yoke.

In the speaker device according to the embodiment of the present invention, the magnetic field circuit portion may include: a yoke disposed below the voice coil and spaced apart from the voice coil; A first magnet in contact with an upper portion of the yoke and spaced apart from the voice coil at an outer side of the voice coil; A first plate which is in contact with an upper portion of the first magnet and is located on the outer side of the voice coil, the voice coil being spaced apart from the voice coil; A second magnet placed in contact with an upper portion of the yoke and spaced apart from the voice coil inside the voice coil; And a second plate which is in contact with an upper portion of the second magnet and is located on the inner side of the voice coil, the second plate being spaced apart from the voice coil, and the magnetic fluid flows between the first plate and the second plate In the region of the second electrode.

In the speaker device according to the embodiment of the present invention, the distance between the first plate and the second plate is smaller than the distance between the first magnet and the second magnet.

A speaker device according to the present invention includes: a diaphragm formed in a plane having a constant height and whose edge region is not fixedly supported; A voice coil mounted on a lower portion of the rim of the diaphragm to receive an input current according to an audio signal; A magnetic field circuit for providing a magnetic field to the voice coil; And a magnetic fluid positioned in a magnetic field supply region of a magnetic field circuit portion for supplying the magnetic field to the voice coil and restrained by the magnetic field, characterized in that the voice coil is supported by the magnetic fluid .

Finally, in the speaker device according to the embodiment of the present invention, the magnetic field circuit portion includes: a yoke disposed on the lower side and the outer side of the voice coil, the yoke being spaced apart from the voice coil; A magnet placed in contact with an upper portion of the yoke and spaced apart from the voice coil inside the voice coil; And a plate which is in contact with an upper portion of the magnet and is located inside the voice coil and apart from the voice coil, the magnetic fluid being located in a region between the yoke and the plate .

According to the above configuration, the speaker device according to the present invention is a speaker device in which a magnetic fluid acts as liquid sealing, and a voice coil or a bobbin, which engages with the magnetic fluid, acts as a hermetic partition wall to shield the front and rear surfaces of the diaphragm, Thereby providing an effect of preventing destructive interference due to the sound of the opposite phase.

Since the edge of the diaphragm does not engage with the frame or the case, the diaphragm does not include a surround, and the front surface of the diaphragm acts as an effective vibration area, so that the speaker device according to the embodiment of the present invention is the same as a dynamic speaker including a conventional surround The loudspeaker efficiency is improved in the diaphragm area to increase the speaker sensitivity and the effect of narrowing the width of the loudspeaker device in the same effective vibration area as that of the conventional dynamic loudspeaker including the surround.

The speaker device according to the embodiment of the present invention does not have a boundary area where the rim of the diaphragm does not engage with the frame or the case or minimizes the engaging portion, Thereby providing a minimizing effect.

Since the edge of the diaphragm does not engage with the frame or the case or minimizes the engaging portion, the driving force for driving the diaphragm is reduced because there is no boundary area in which the vibration displacement is small, It improves the loudspeaker efficiency by improving the speaker efficiency in the magnet with the same output power as the fixed fixed type dynamic speaker and can reduce the magnet output at the same speaker efficiency as the conventional diaphragm fixed dynamic speaker, Thereby providing an effect of reducing the height of the apparatus.

The speaker device according to the embodiment of the present invention does not have a boundary area in which the rim of the diaphragm does not engage with the frame or the case or minimizes the engaging portion and thus the vibration displacement becomes small and the vibration displacement of the entire portion is substantially the same, The height of the coil winding of the voice coil can be reduced to provide the effect of reducing the height of the speaker device.

The speaker device according to the embodiment of the present invention provides an effect of easily adjusting the damping force of the diaphragm by adjusting the viscosity of the magnetic fluid that provides the suspension function of the diaphragm.

The speaker device according to the embodiment of the present invention provides an effect of preventing contact between the voice coil and the magnetic field circuit because the voice coil is held in contact with the magnetic fluid.

Finally, the speaker device according to the embodiment of the present invention provides the effect of improving the heat radiation performance by absorbing the heat generated from the voice coil through the structure in which the magnetic fluid surrounds the voice coil.

1 is a view showing a speaker mounting structure of a flat panel TV;
2 is a view showing a speaker mounting structure of a smartphone;
3 is a sectional view showing a dynamic speaker according to the prior art;
4 is an exploded view of a conventional TV speaker.
5 is a diagram showing an effective vibration area of a TV speaker according to the related art.
6 is a sectional view showing a speaker to which a magnetic fluid according to the related art is applied.
7 is a sectional view showing a speaker to which a magnetic fluid according to the related art is applied.
8 is a sectional view showing a speaker to which a magnetic fluid according to the related art is applied.
9 is a sectional view showing a speaker device according to an embodiment of the present invention.
10 is an enlarged cross-sectional view showing a coupling portion of a vibration portion and a magnetic field circuit portion of a speaker device according to an embodiment of the present invention;
11 is an enlarged cross-sectional view showing a coupling portion of a vibration portion and a magnetic circuit portion of a speaker device according to an embodiment of the present invention;
FIG. 12 is an enlarged cross-sectional view showing a coupling portion of a vibration portion and a magnetic circuit portion of a speaker device according to an embodiment of the present invention; FIG.
FIG. 13 is an enlarged cross-sectional view showing a coupling portion of a vibration portion and a magnetic field circuit portion of a speaker device according to an embodiment of the present invention; FIG.
14 is a sectional view showing a speaker device according to an embodiment of the present invention;
15 is a sectional view showing a speaker device according to an embodiment of the present invention;
16 is a three-dimensional sectional view showing a speaker device according to an embodiment of the present invention.
17 is an exploded view of a speaker device according to an embodiment of the present invention.
18 is a perspective view showing a vibration part of a speaker device according to an embodiment of the present invention;
Fig. 19 is an enlarged cross-sectional view showing a coupling portion of a vibration portion and a magnetic circuit portion of a speaker device according to an embodiment of the present invention; Fig.
20 is an enlarged cross-sectional view showing a coupling portion of a vibration portion and a magnetic field circuit portion of a speaker device according to an embodiment of the present invention;

Hereinafter, various embodiments of the present invention will be described with reference to the drawings. The embodiments of the present invention described below are provided in a manner in which the detailed configuration and operation are ways of defining the present invention in a manner to explain the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It is therefore to be understood that the invention includes various modifications and variations within the spirit of the invention.

9 shows a speaker device 100 according to the present invention. The speaker device 100 according to the present invention includes a vibration unit 110, a magnetic field circuit unit 120, a magnetic fluid 130, and a case unit 140. The diaphragm 111 vibrates to generate sound by the electromagnetic force between the magnetic field provided by the magnetic field circuit unit 120 and the voice coil 113 constituting the vibration unit 110. The front surface and the rear surface of the diaphragm 111 are covered with a magnetic fluid The magnetic fluid 130 is restored to the diaphragm 120 while the voice coil 113 is spaced apart from the magnetic circuit 120 by the magnetic flux.

In the following description, each component will be described.

The vibration unit 110 includes a diaphragm 111 and a voice coil 113 to generate sound through vibration of the diaphragm 111. [ For example, a polymer film, paper, metal thin film, FPCB or the like may be used as the material of the diaphragm 111, but other known diaphragm materials capable of generating negative pressure by vibration can be used. The diaphragm 111 may have a planar shape, a cone shape, a dome shape, or the like. The diaphragm 111 may have a circular shape, a rectangular shape, a polygonal shape, and the like. .

The voice coil 113 is a coil to which an input current according to an audio signal is applied, and is formed on the bottom surface of the diaphragm 111 as shown in FIGS. The voice coil 113 may be formed on the bottom surface of the diaphragm 111 through the bobbin 112 as shown in FIGS. 10 to 12, or may be formed on the bottom surface of the diaphragm 111, It may be directly attached to the bottom surface of the diaphragm 111 without interposing the bobbin 112 as shown in FIG. The voice coil 113 may be formed on the outermost bottom surface of the diaphragm 111 as shown in FIG. 10 or may be formed on the inner bottom surface of the outermost surface of the diaphragm 111 as shown in FIG. 11 May be formed on the outer bottom surface of the outermost edge of the diaphragm 111 as shown in FIG.

In the present invention, since the entire frame of the diaphragm 111 is not attached to the frame 140 or the case 140, the vibration displacement of the central portion and the frame of the diaphragm 111 is relatively uniform. Therefore, the speaker device 100 of the present invention can wind the voice coil 113 close to the rim or rim of the diaphragm, as compared with the conventional dynamic speaker 30 shown in Fig. Accordingly, the speaker device 100 of the present invention reduces the height of the coil of the voice coil 113, thereby providing an effect of ultimately reducing the height of the speaker device 100.

The magnetic field circuit unit 120 performs a function of supplying a magnetic field to the voice coil 113. The magnetic field circuit unit 120 includes a yoke 121, a magnet 122, and a plate 123 in the same manner as a conventional dynamic speaker. 9, the magnetic circuit 120 may be embodied such that the magnet 122 is positioned inside the voice coil 111. When the magnet 222 is mounted on the voice coil 111 as shown in FIG. 14, The first magnet 322 is disposed outside the voice coil 211 and the second magnet 352 is disposed inside the voice coil 311 as shown in FIG. And the magnet 422 may be implemented as a lower type in which the magnet 422 is positioned below the voice coil 411 as shown in FIG. The magnetic field circuit portion 120 is not limited to the shapes shown in Figs. 9, 14, 15, and 16, but may be any shape capable of supplying a magnetic field to the voice coil 211. [

The bobbin 112 or the voice coil 113 of the diaphragm 111 may be coupled to the magnetic fluid 130 without the entire frame of the diaphragm 111 being attached to the frame or the case 140, The driving force for driving the diaphragm 111 is required to be small. Therefore, compared with the conventional dynamic speaker 30 shown in FIG. 3, the speaker device 100 of the present invention can reduce the manufacturing cost of the speaker device 100 by using a low-priced magnet having a weak magnetic property, Thereby reducing the height of the speaker device 100 in an endless manner.

The magnetic fluid 130 is confined to the magnetic field of the magnetic field circuit unit 120 and seals the front and rear surfaces of the diaphragm.

The magnetic fluid 130 is a magnetic colloid solution containing a ferromagnetic fine particle and a surfactant, and is used as a sealing member for a high-speed rotating component such as a motor drive shaft because it has a property of being not separated from the surface of a magnetic object. On the other hand, the magnetic fluid 130 application in the speaker has been used only as a member for reinforcing the suspension function or as a member for aligning the voice coil and suppressing the heat generation.

The present invention shields the front surface and the rear surface of the diaphragm 111 by using the function of the magnetic fluid 130 as a sealing member to prevent destructive interference due to the opposite phase sound generated from the back surface of the diaphragm 111. [ In the conventional dynamic speaker, the frame of the diaphragm 111 is engaged with the frame for sealing the front and rear surfaces of the diaphragm 111. Therefore, the diaphragm 111 is required to prevent partial vibration of each frequency and to prevent reflection of vibration at the interface. However, since the diaphragm 111 of the present invention does not engage with the frame or minimizes the coupling, such surround is not required, so that the effective vibration area of the diaphragm 111 can be maximized to improve the speaker efficiency or reduce the width of the speaker device. Provides a possible effect.

The case part 140 includes at least one of the vibration part 110 and the magnetic circuit part 120 to form the external shape of the speaker device. 9, the case portion 140 is formed only of the upper case 140 such as a dust cap, and the lower case is sealed by the yoke 121, so that a separate lower case is not required. However, according to the embodiment, it may further include a lower case in which the magnetic field circuit unit 120 is mounted, and a single case unit 130 may be implemented to include both the vibration unit 110 and the magnetic circuit unit 120 have. Or the case 140 may be partially opened as in the case of the frame 38 of FIG. 4 or may be formed as an enclosure or the like of a TV component, for example, in which the speaker device 100 is mounted It can also be implemented in the form of a panel of IT equipment.

&Lt; Non-engagement edge region of diaphragm >

The diaphragm 111 of the present invention necessarily includes an unbonded edge region where at least a part of the rim of the diaphragm 111 does not engage with the case portion. The unbonded frame region may be formed to be the entire frame of the diaphragm 111 as shown in FIG. 17, or only a part of the frame of the diaphragm 111 may be coupled to the case portion 140, And may not be combined with the unit 140. For example, in the embodiment in which the electric path for providing the input current to the voice coil 113 is formed by attaching the FPCB to the bottom surface of the diaphragm 111, an extension terminal 114 is formed in a part of the diaphragm 111, And the terminal 114 functions as an input terminal exposed to the outside of the case part 140 by being inserted into the case part 140.

17, the diaphragm 111 has a small coupling area even when a part of the rim is coupled to the case 140 as shown in FIG. 18, as well as the case where the entire diaphragm 111 rim is an unbonded rim area. It is desirable to implement the surround without including the effective vibration area.

At least a part of the voice coil 113 formed on the bottom surface of the non-engagement edge region of the diaphragm 111 is held in contact with the magnetic fluid 130.

The magnetic fluid 130 can be partially coupled to the voice coil 113 in the section where the plate 123 and the yoke 121 are opposed to each other as shown in Fig. The magnetic fluid 130 may be filled in a space defined by the plate 123, the yoke 121 and the magnet 121 so that the lower portion of the voice coil 113 and the bobbin 112 are impregnated have. The voice coil 113 and the lower portion of the bobbin 112 are made to be impregnated with the impregnated material because the amount of the magnetic fluid 130 is small in the partially combined embodiment, The vibration portion 110 receives buoyancy by the magnetic fluid 130, thereby providing a more stable support.

20, the magnetic field circuit part 120 may further include an additional upper magnet 124 and an upper plate 125 to couple with the bobbin 112 rather than the voice coil 113. [ Although not shown, the magnetic fluid 130 may be partially coupled only to the voice coil 113 formed on the outer peripheral surface of the bobbin 112 and the outer magnetic circuit part 120, or may be partially coupled to the inner peripheral surface of the bobbin 112, It may be partially combined with the inner magnetic circuit part 120 only.

10, the magnetic field circuit unit 120 includes a yoke 121 disposed on the lower side and the outer side of the voice coil 113 so as to be spaced apart from the voice coil 113, And contacts the upper portion of the magnet 122 and the magnet 122 which are located on the inner side of the voice coil 113 and spaced apart from the voice coil 113 so that the voice coil 113 is spaced apart from the voice coil 113 inside the voice coil 113 And the magnetic fluid 130 is configured to be positioned in a region between the yoke 121 and the plate 123. [ At this time, it is preferable that the plate 123 is implemented such that the distance from the yoke 121 is smaller than the distance between the magnet 122 and the yoke 121.

14, the magnetic field circuit unit 220 includes a yoke 221 located on the lower side and the inner side of the voice coil 213 so as to be spaced apart from the voice coil 213, And contacts the upper part of the magnet 222 and the magnet 222 which are located apart from the voice coil 213 on the outer side of the voice coil 213. The voice coil 213 is spaced apart from the voice coil 213 on the outer side of the voice coil 213, And the magnetic fluid 230 is configured to be positioned in a region between the yoke 221 and the plate 223. [ At this time, it is preferable that the plate 223 is implemented such that the distance from the yoke 221 is smaller than the distance between the magnet 222 and the yoke 221.

15, the magnetic field circuit portion 320 is disposed below the voice coil 313 in contact with the upper portion of the yoke 321 and the yoke 321 spaced apart from the voice coil 313, A first magnet 322 disposed on the outer side of the coil 313 and spaced apart from the voice coil 313 and a voice coil 313 disposed on the outer side of the voice coil 313 in contact with the upper portion of the first magnet 322, A second magnet 352 and a second magnet 352 which are located on the inner side of the voice coil 313 and spaced apart from the voice coil 313 by contact with the upper portion of the yoke 321, And a second plate 353 disposed on the inner side of the voice coil 313 in contact with an upper portion of the voice coil 313 and spaced apart from the voice coil 313. The magnetic fluid 330 is disposed between the first plate 323 and the voice coil 313, 2 plate 353. In this embodiment, It is preferable that the first plate 323 and the second plate 353 are spaced apart from each other by a distance smaller than a distance between the first magnet 322 and the second magnet 352.

16, the magnetic field circuit portion 420 includes a magnet 422 formed on the lower side of the voice coil 413 and spaced apart from the voice coil 413, A plate 423 located outside the voice coil 413 and spaced apart from the voice coil 413 and extending beyond the height of the magnet 422 and a plate 423 contacting the other side of the magnet facing one side of the magnet 422 And the yoke 421 is located inside the voice coil 413 and is spaced apart from the voice coil 413 and extends beyond the height of the magnet 422. The magnetic fluid 430 is a magnetic fluid, The yoke 421 and the plate 423, which extend beyond the height of the yoke 421. [

The speaker device 100 of the present invention allows the front and back surfaces of the diaphragm 111 to be sealed with each other through the magnetic fluid 130 while preventing the diaphragm 111 from being coupled to the case 140 or minimizing the coupling Effect. Because of this effect, since the diaphragm 111 of the present invention does not need to form a surround, the effective vibration area is enlarged to the entire diaphragm 111. Therefore, since the effective vibration area of the diaphragm 111 is widened in the speaker of the same standard as that of the conventional dynamic speaker, the efficiency and sensitivity of the speaker are increased. In addition, when the effective vibration area is the same as that of the conventional dynamic speaker, the width and length of the diaphragm of the speaker device can be designed to be smaller, thereby providing a more compact speaker device.

100, 200, 300, 400: Speaker device 110, 210, 310:
111, 211, 311, 411: diaphragm 112, 212, 312, 412:
113, 213, 313, 413: Voice coil 120, 220, 320, 420:
121, 221, 321, 421: yoke 122, 222, 322,
123, 223, 323, 423: plate 130, 230, 330,
140, 240,

Claims

A vibration unit including a diaphragm and a voice coil formed at a bottom of the diaphragm frame of the diaphragm;
A magnetic field circuit for supplying a magnetic field to the voice coil;
A magnetic fluid confined to the magnetic field of the magnetic circuit; And
And a case part including at least one of the vibrating part and the magnetic circuit part,
Wherein the diaphragm includes an unbonded edge region in which at least a part of the diaphragm edge is not engaged with the case portion,
Wherein at least a part of the voice coil formed on a bottom surface of the non-engagement edge region of the diaphragm is held in contact with the magnetic fluid.

The method according to claim 1,
Wherein the magnetic field circuit portion includes: a yoke disposed on the lower side and the inner side of the voice coil, the yoke being spaced apart from the voice coil; A magnet which is in contact with an upper portion of the yoke and is located outside the voice coil and apart from the voice coil; And a plate disposed on the outer side of the voice coil in contact with an upper portion of the magnet and spaced apart from the voice coil,
Wherein the magnetic fluid is located in a region between the yoke and the plate.

The method according to claim 1,
Wherein the magnetic field circuit portion includes: a yoke disposed on a lower side and an outer side of the voice coil, the yoke being spaced apart from the voice coil; A magnet placed in contact with an upper portion of the yoke and spaced apart from the voice coil inside the voice coil; And a plate which is in contact with an upper portion of the magnet and is located on the inner side of the voice coil and spaced apart from the voice coil,
Wherein the magnetic fluid is located in a region between the yoke and the plate.

The method according to claim 1,
The magnetic field circuit unit includes a magnet formed on a lower side of the voice coil and spaced apart from the voice coil, a magnet disposed on the outer side of the voice coil in contact with one side of the magnet and spaced apart from the voice coil, plate; And a yoke disposed on the inner side of the voice coil in contact with the other side of the magnet facing one side of the magnet and spaced apart from the voice coil and extending beyond the height of the magnet,
Wherein the magnetic fluid is located in a region between the yoke and the plate extending beyond the height of the magnet.

The method according to claim 1,
Wherein the diaphragm does not include the edge.

The method according to claim 1,
The diaphragm has no edge on its surface,
And the non-joined edge region is the entire diaphragm frame.

The method according to claim 6,
Wherein the voice coil is formed on an outermost bottom surface of the diaphragm frame.

The method according to claim 1,
The vibrating portion may further include a bobbin,
Wherein the voice coil is formed on a bottom surface of the diaphragm frame via the bobbin.

A diaphragm formed in a plane having a constant height and in which the edge region is not fixedly supported;
A bobbin mounted on a lower portion of the rim region of the diaphragm;
A voice coil wound on the bobbin and receiving an input current according to an audio signal;
A magnetic field circuit for providing a magnetic field to the voice coil; And
And a magnetic fluid which is located in a magnetic field supply region of the magnetic circuit portion for supplying the magnetic field to the voice coil and is constrained by the magnetic field,
Wherein the voice coil or the bobbin is supported by the magnetic fluid.

10. The method of claim 9,
Wherein the magnetic field circuit portion includes: a yoke disposed on the lower side and the inner side of the voice coil, the yoke being spaced apart from the voice coil; A magnet which is in contact with an upper portion of the yoke and is located outside the voice coil and apart from the voice coil; And a plate disposed on the outer side of the voice coil in contact with an upper portion of the magnet and spaced apart from the voice coil,
Wherein the magnetic fluid is located in a region between the yoke and the plate.

11. The method of claim 10,
Wherein a distance between the yoke and the magnet is smaller than a distance between the magnet and the yoke.

10. The method of claim 9,
Wherein the magnetic field circuit portion includes: a yoke disposed below the voice coil and spaced apart from the voice coil; A first magnet in contact with an upper portion of the yoke and spaced apart from the voice coil at an outer side of the voice coil; A first plate which is in contact with an upper portion of the first magnet and is located on the outer side of the voice coil, the voice coil being spaced apart from the voice coil; A second magnet placed in contact with an upper portion of the yoke and spaced apart from the voice coil inside the voice coil; And a second plate which is in contact with an upper portion of the second magnet and is located on the inner side of the voice coil and spaced apart from the voice coil,
Wherein the magnetic fluid is located in a region between the first plate and the second plate.

13. The method of claim 12,
Wherein a distance between the first plate and the second plate is smaller than a distance between the first magnet and the second magnet.

10. The method of claim 9,
Wherein the magnetic field circuit portion includes: a yoke disposed on a lower side and an outer side of the voice coil, the yoke being spaced apart from the voice coil; A magnet placed in contact with an upper portion of the yoke and spaced apart from the voice coil inside the voice coil; And a plate which is in contact with an upper portion of the magnet and is located on the inner side of the voice coil and spaced apart from the voice coil,
Wherein the magnetic fluid is located in a region between the yoke and the plate.

15. The method of claim 14,
Wherein a distance between the yoke and the magnet is smaller than a distance between the magnet and the yoke.

A diaphragm formed in a plane having a constant height and in which the edge region is not fixedly supported;
A voice coil mounted on a lower portion of the rim of the diaphragm to receive an input current according to an audio signal;
A magnetic field circuit for providing a magnetic field to the voice coil; And
And a magnetic fluid which is located in a magnetic field supply region of the magnetic circuit portion for supplying the magnetic field to the voice coil and is constrained by the magnetic field,
Wherein the voice coil is supported by the magnetic fluid.

17. The method of claim 16,
Wherein the magnetic field circuit portion includes: a yoke disposed on the lower side and the inner side of the voice coil, the yoke being spaced apart from the voice coil; A magnet which is in contact with an upper portion of the yoke and is located outside the voice coil and apart from the voice coil; And a plate disposed on the outer side of the voice coil in contact with an upper portion of the magnet and spaced apart from the voice coil,
Wherein the magnetic fluid is located in a region between the yoke and the plate.

17. The method of claim 16,
Wherein the magnetic field circuit portion includes: a yoke disposed below the voice coil and spaced apart from the voice coil; A first magnet in contact with an upper portion of the yoke and spaced apart from the voice coil at an outer side of the voice coil; A first plate which is in contact with an upper portion of the first magnet and is located on the outer side of the voice coil, the voice coil being spaced apart from the voice coil; A second magnet placed in contact with an upper portion of the yoke and spaced apart from the voice coil inside the voice coil; And a second plate which is in contact with an upper portion of the second magnet and is located on the inner side of the voice coil and spaced apart from the voice coil,
Wherein the magnetic fluid is located in a region between the first plate and the second plate.

17. The method of claim 16,
Wherein the magnetic field circuit portion includes: a yoke disposed on a lower side and an outer side of the voice coil, the yoke being spaced apart from the voice coil; A magnet placed in contact with an upper portion of the yoke and spaced apart from the voice coil inside the voice coil; And a plate which is in contact with an upper portion of the magnet and is located on the inner side of the voice coil and spaced apart from the voice coil,
Wherein the magnetic fluid is located in a region between the yoke and the plate.