KR100691750B1 - speaker unit with inner wire withdrawal structure - Google Patents

Abstract

The present invention relates to a speaker unit which improves a method of bonding a wire of a voice coil to an external air inlet groove formed on an inner wall of a frame and bonding the wire to a conventional diaphragm to draw out. The present invention is a diaphragm; A magnet arranged in a lower portion of the diaphragm and formed in a ring shape; A frame in which the diaphragm and the magnet are mounted, and at least one inlet groove is formed on an inner side of the diaphragm to allow the outside air to flow along the side of the magnet; A substrate arranged under the magnet and receiving electrical signals from the outside; And a voice coil arranged at a lower portion of the diaphragm and a central portion of the magnet, and having a wire coil drawn out along the inflow groove and electrically connected to the substrate.

Speaker, Groove, Magnet, Diaphragm, Voice Coil, Wire

Description

Speaker unit with inner wire withdrawal structure}

1 is a cross-sectional view showing a wire drawing structure of a conventional speaker unit.

2 is a cross-sectional view of the speaker unit according to the present invention.

3 is a view showing a substrate arranged in the lower portion of the speaker unit according to the present invention.

4 is a partially cutaway perspective view of the speaker unit according to the present invention.

5 is an assembly view of the frame of the speaker unit according to the present invention.

6 is a perspective view illustrating another embodiment of the frame of FIG. 5.

Explanation of symbols on the main parts of the drawings

11: wire 15: magnet

21: diaphragm 22: voice coil

25: yoke 26: substrate

31: upper frame 34: upper inlet groove

41: lower frame 44: lower inlet groove

51: grill

The present invention relates to a speaker unit having an internal wire drawing structure, wherein a speaker coil is bonded to an external air inlet groove formed in an inner wall of a frame to improve the method of bonding the wire to a conventional diaphragm and drawing it out to the outside. It is about.

Conventional earphones were generally mounted on the outside of the ear, and a speaker unit used for such earphones is shown in FIG. 1. In addition, a speaker used in a general mobile communication device is also formed in the structure shown in FIG.

In FIG. 1, the conventional speaker S1 (S2) includes a yoke 1, a vibration generating magnet 2, a magnet plate 3, a diaphragm (diaphragm 4), and a voice coil 5 attached to the rear surface of the diaphragm, It consists of a PCB 6 and a frame 7 supporting these components, a protective cap 8 and the like. The voice coil 5 and the PCB 6 are electrically connected by a wire 9 coming out of the voice coil.

In the speaker unit having such a structure, when a current including a voice signal flows through the voice coil 5, a coil in the magnetic field of the vibration generating magnet 2 vibrates on the diaphragm according to the strength of the current to radiate sound to the outside of the speaker. do. In this case, the through hole 10 is formed in the center of the yoke 1 so that air is circulated to help vibration of the diaphragm 4.

Recently, the size of the speaker unit used in earphones has been miniaturized and developed into a size that can be inserted into the ear. Also, in a mobile communication device, a small speaker is used to reduce the mounting space of components and thus have different functions. It adds parts or reduces the overall size of mobile communication devices. However, the conventional speaker unit having the structure as shown in FIG. 1 has difficulty in miniaturizing the size of the speaker unit.

That is, even if the size of the magnet and the diaphragm is reduced, if the size of the yoke 1 is reduced, it is impossible to form a through hole in the center. Therefore, there is a problem that must be equipped with a new air circulation structure to ensure the vibration of the diaphragm (4).

Moreover, the wire 9 of the conventional speaker unit is attached to one side of the diaphragm 4 and is configured to be connected to the PCB 6 by riding on the outer wall of the frame 7. In this case, the weight of one side of the diaphragm 4 is different from the weight of the other side, and the width of the vertical vibration of the diaphragm is different, which causes non-uniform negative characteristics.

In addition, since the wires 9 are arranged in this way, the conductive wires are exposed to the outside, which may cause a problem of disconnection during assembly or use. In particular, when the speaker unit is miniaturized and a thin diaphragm is used, it is very difficult to solve this problem.

The present invention is to solve the above problems, to provide a frame of a new structure in which the external air circulation passage is formed in the compact speaker unit, and to draw the wire of the voice coil through the external air circulation passage, the diaphragm smoothly The purpose of the present invention is to enable the inflow and outflow of air so as to vibrate, and to prevent the occurrence of distortion vibration caused by the difference in weight by attaching a wire to the diaphragm.

In addition, the present invention provides a structure to connect the lower substrate and the wire without attaching the wire to the diaphragm of the ultra-small speaker unit to obtain a uniform up and down vibration of the diaphragm, can provide a good sound quality, It is an object to make it possible to improve the sound quality characteristics of a compact speaker unit.

As a construction means for achieving the above object, the present invention is a diaphragm; A magnet arranged in a lower portion of the diaphragm and formed in a ring shape; A frame in which the diaphragm and the magnet are mounted, and at least one inlet groove is formed on an inner side of the diaphragm to allow the outside air to flow along the side of the magnet; A substrate arranged under the magnet and receiving electrical signals from the outside; And a voice coil arranged at a lower portion of the diaphragm and a central portion of the magnet, and having a wire coil drawn out along the inflow groove and electrically connected to the substrate.

Preferably, the wire of the voice coil is bonded to the inner wall of the inlet groove. In addition, the substrate is arranged in the lower portion of the magnet and the inside of the frame, the inlet groove may be formed in the frame along the side of the magnet and the substrate.

Also preferably, the frame may include a protrusion protruding in a predetermined length inward direction to secure a space between the diaphragm and the magnet, and an inlet of the inflow groove may be formed at a lower side of the protrusion. It is also preferred that the diaphragm be a biaxially stretched polyethylene naphthalate (PEN) film formed to a thickness of 4.2-6 μm.

In addition, the frame is formed of an upper and lower frames that can be fitted to each other, the inlet grooves may be formed in the upper and lower frames, respectively, wherein the upper surface of the lower frame and the outer diameter smaller than the outer diameter of the lower frame Inserts having the same inner diameter are formed to protrude upwards, the lower inner diameter of the upper frame is formed to be the same as the outer diameter of the lower portion of the lower frame to be inserted, the inner surface of the upper frame At least one coupling protrusion extending in the lower direction of the protrusion may be formed, and the insertion portion of the lower frame may be configured to have at least one coupling groove to which the coupling protrusion is coupled.

In addition, the frame, it is preferable that at least one circulation groove is formed along the side of the magnet from between the magnet and the diaphragm so as to circulate the air located between the diaphragm and the magnet.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view of the speaker unit according to the present invention. Speaker unit according to the present invention includes a frame (31,41) formed in a cylindrical shape on the outside as shown in Figure 2, the diaphragm 21, magnet 15, yoke inside the frame (31, 41) 25, the substrate 26, and the like.

First, the diaphragm 21 is formed of a thin film vibration film, and the thickness is selected to match the acoustic frequency according to the design value. As the vibrating film, a polyester film is used, in particular, a biaxially stretched polyester naphthalate (PEN) film.

The polyester film has excellent tensile strength, impact strength, rupture strength, etc. due to the rigid molecular chain structure, and also has an appropriate elongation. The film has a melting point of about 266 degrees, and particularly has excellent thermal dimensional stability with a glass transition temperature of 123 degrees.

The diaphragm uses a film of 4.2 ~ 6 ㎛ depending on the acoustic frequency of the design value. The smaller the thickness of the film, the better the sound quality. The present invention relates to a compact speaker unit, and when the thickness of the diaphragm used in the compact speaker unit is smaller than 4.2 占 퐉, it is difficult to be torn during vibration or attached to the speaker frame. In addition, if a vibrating film of 6 μm or more is used for a micro speaker unit (normally, the diameter of an external unit inserted into the ear after the speaker unit is mounted is about 6 mm), it is impossible to obtain desired sound characteristics. Most preferably, the vibrating film used for the speaker unit used for the product having a diameter of 6 mm is 4.6 μm.

As shown in the cross section of FIG. 2, the upper side of the diaphragm 21 has semi-circular convex portions formed in the center and the circumference of the center, and the voice coil 22 is formed in the lower part. The voice coil 22 is a current is input to create a magnet and an electromagnetic field to function to cause the vibration of the diaphragm.

The voice coil 22 is located in a space formed at the center of the magnet 15. The magnet 15 is formed in a ring shape so that the voice coil 22 is positioned at the center thereof, and is formed to be supported while contacting the inner surfaces of the frames 31 and 41. The magnet 15 is supported via the yoke 25, in particular at the bottom. The yoke 25 has a central portion projecting upward to be inserted and supported in the center of the ring magnet 15, and the voice coil 22 is positioned between the center portion of the yoke and the magnet.

The lower part of the yoke is arranged with a substrate 26 that receives an electrical signal from the outside and transmits it to the voice coil. In addition, the grill 51 having a plurality of holes is arranged on the upper surface of the diaphragm 21.

The speaker unit frame according to the present invention is characterized in that it comprises an inlet groove formed on the inner surface to allow the inflow (or outflow) of the outside air along the side of the magnet. In addition, in addition to the inlet groove, the circulation groove may be additionally formed, and each frame is formed by separating the upper and lower frames and combining them.

5 is a perspective view of the upper and lower frames. The frame of the present invention may be assembled by separating the upper frame 31 and the lower frame 41, respectively.

In the present embodiment, the upper frame 31 is formed in a cylindrical shape, and a protrusion 35 protruding a predetermined length in a ring shape is formed inside. The protrusion 35 functions to partition the space to form a space between the diaphragm 21 and the magnet 15, and the diaphragm 21 is adhesively arranged on an upper portion of the protrusion 35.

At least one upper inflow groove 34 is formed in the upper frame 31. The inflow groove 34 is a groove formed with a predetermined width from a lower surface of the upper frame 31 to a lower portion of the protrusion 35, and air from the outside is introduced or air between the diaphragm and the magnet is transferred to the outside. It acts as a passage through which it can be discharged. That is, when the magnet 15 comes into contact with the lower surface of the protrusion 35 and the inner surface of the frame, when the inflow groove 34 is formed only on the inner surface of the frame, the inflow groove is blocked by the magnet to provide an air inflow (outflow) effect. You will not be able to. Therefore, in order to form the inlet groove inlet to the protrusion, the inlet groove 34 is preferably formed from a portion of the protrusion to the lower frame.

The lower frame 41 is formed in a cylindrical shape like the upper frame, and is preferably formed in the same diameter as the upper frame so as to form one cylindrical outer surface when combined. In addition, the upper surface of the lower frame 41 is formed with an insertion portion that can be inserted into the lower portion of the upper frame 31. The insertion part 42 has an inner diameter that is the same as the inner diameter of the lower frame 41, and the outer diameter is formed to have a structure smaller than the outer diameter of the lower frame 41. In particular, the outer diameter of the insertion part 42 is the upper frame 31. It is formed equal to the inner diameter of the lower side. Therefore, the insertion portion 42 of the lower frame 41 is formed to be inserted into the lower portion of the upper frame 31 to be fitted.

In order to achieve such a fitting structure, the inner diameter of the portion between the inner diameter of the lower side of the upper frame 31 and the protrusion is changed. That is, the lower side of the upper frame 31 is formed with an inner diameter into which the insertion portion can be inserted, and the upper portion thereof forms a step with the same inner diameter as the inner diameter of the lower frame insertion portion so as to contact the upper surface of the insertion portion of the lower frame 41. (No. 33) The upper inlet groove 34 is formed in a portion which forms a step and is formed with the same inner diameter as the inner diameter of the insertion portion.

The lower inflow groove 44 for air circulation is formed in the lower frame 41 as in the upper frame 31. The lower inlet groove 44 is connected to the upper inlet groove 34 of the upper frame to form one air circulation passage. The lower inflow groove 44 is formed to have the same width and depth as the upper inflow groove 34 on the inner surface from the upper surface to the lower surface of the lower frame 41.

In addition, at least one coupling protrusion 32 is provided on the upper frame 31 to fix the positions of the inflow grooves 34 and 44 of the lower frame and the upper frame, that is, to prevent the inflow grooves from being shifted from each other while the lower frame is inserted. ) Is formed in the insertion portion 42 of the lower frame 41 is formed in the coupling groove 43 which can also be inserted into the coupling projection (32).

The fitting structure of the coupling protrusion 32 and the coupling groove 43 allows the inlet grooves to be accurately positioned so that the lower frame and the upper frame form one air circulation passage.

At this time, the engaging projection 32 is preferably formed on the lower side of the upper frame (part having the same inner diameter as the outer diameter of the insertion portion), and has a structure blocked from the upper portion to the protrusion except the inlet groove 34. .

The speaker unit of the present invention has a frame formed of the upper and lower frames as shown in FIG. The frame is separated and manufactured up and down to form a single outer frame, thereby making it easy to form an air circulation structure inside the housing. That is, inlet grooves are formed in the housing in order to form an air circulation path to the magnet side, and the frames are formed by separating the upper frame 31 and the lower frame 41, respectively, and combined to form a complex inside. The difficulty of injection can be avoided.

In the first embodiment of the present invention, the upper and lower frames constitute an outer frame, and an inlet groove for air circulation is formed on the inner surface of the frame. Accordingly, the micro speaker unit provides a structure capable of forming a flow path for air circulation. In the second embodiment of the present invention, in addition to the inlet groove, a circulation groove 37 for air circulation is additionally formed.

6 is a perspective view showing a coupling state of the upper and lower frames according to the second embodiment of the speaker unit according to the present invention. Like the first embodiment, the upper frame 31 is provided with a protrusion 35. An inflow groove 34 is formed in a lower portion of the protrusion, and a coupling protrusion 32 is formed to be coupled to the lower frame 41.

The upper frame 31 of the second embodiment additionally forms a circulation groove 37 for air circulation in addition to the inflow groove 34. The circulation groove 37 is formed adjacent to the inflow groove 34 with the coupling protrusion 32 therebetween. The circulation groove 37 may be formed on both sides of the inflow groove 34 and the opposite of the inflow groove, respectively.

The circulation groove 37 may be formed in plural so as to improve the sound characteristics by circulating air between the diaphragm 21 and the magnet 15. To this end, inflow grooves and circulation grooves are formed between the coupling protrusions formed at the lower portions of the protrusions. In the first embodiment, only the inlet groove 34 in which the inlet is formed in the lower portion of the protrusion 35 is formed, but in the second embodiment, as in the inlet groove 34, the inlet is formed in the lower side of the protrusion in the plurality. The dogs are formed, and the boundary between these inflow grooves and the circulation grooves is formed with the engaging protrusion 32.

Coupling protrusion 32 is formed on the inner surface of the upper frame, it has a shape that naturally protrudes by the circulation groove and the inlet groove. The upper surface of the engaging projection 32 is in contact with the lower surface of the protrusion, whereby the engaging projection 32 is shaped as if forming a step.

The lower frame 41, as in the first embodiment, includes an inserting portion 42 formed on the upper surface so as to be inserted into the upper frame, and the inserting portion is formed with a coupling groove 43 into which the engaging projection can be inserted. . The lower frame 41 is formed with a lower inlet groove 44 to be connected to the inlet groove 34 of the upper frame 31 to form one air circulation structure. In addition, the upper surface of the insert part is the upper frame 31. The lower surface of the circulation groove 37 is made.

That is, the circulation groove 37 in the second embodiment has a shape in which the lower surface is blocked by the upper surface of the insert portion of the lower frame 41. This is shown in FIG. In FIG. 11, the right inlet grooves 34 and 44 connect the space between the outside and the magnet and the diaphragm at the side of the magnet 15, and the circulation groove 37 on the left side is the space between the magnet and the diaphragm and the magnet. Is formed on the side portion of the structure is not circulated with the outside. The circulation groove 37 functions to expand the air circulation path of the space portion to make the air circulation more smooth.

3 is a view showing a state in which the wire of the voice coil is drawn out and soldered to the substrate of the speaker unit according to the present invention. 4 is a partial cutaway perspective view illustrating a state in which a voice coil of a speaker unit according to the present invention is arranged in a frame, and a state in which a wire in the voice coil is drawn out along an inflow groove of the frame and connected to a substrate.

As described in the first and second embodiments of the present invention, the speaker units of the present invention have inlet grooves 34 and 44 formed in the frame. In the above-described embodiment, the frame has been described as combining the upper frame 31 and the lower frame 41 to form one frame. However, the frame is not limited thereto, and one frame may be used.

Inner surfaces 34 and 44 are formed on inner surfaces of the frames 31 and 41 to circulate air with the outside. Along the inlet groove, the wire 11 drawn from the voice coil 22 is connected to the lower substrate 26.

That is, as shown in FIG. 4, the wire 11 is drawn out of the voice coil 22 arranged in the lower center of the diaphragm 21. The wire 11 extends horizontally from the voice coil 22 toward the inflow groove 34, and is bent almost vertically from the inner wall of the inflow groove 34 to descend downward. At this time, since the front surfaces of the inlet grooves 34 and 44 are blocked by the magnet (not shown in FIG. 4), the wire 11 may not be interfered with by other components even if it is not specially fixed. It does not occur when a short circuit is applied.

However, after the wire 11 is soldered to the substrate, it is more preferable to bond the inner wall of the inflow grooves 34 and 44 through an adhesive means to prevent the solder part from being damaged by the shaking of the wire.

Since the inlet grooves 34 and 44 for air circulation are formed to the bottom of the frame and connected to the outside, the inlet grooves 34 and 44 may be directly connected to the substrate arranged at the bottom bottom of the frame. That is, the wire 11 lowered to the side of the substrate 26 is bent almost vertically and soldered to the substrate 26. At this time, the wire is preferably two strands (11a, 11b), respectively connected to the positive electrode and the negative electrode.

The speaker unit according to the present invention is formed of the upper frame 31 and the lower frame 41 is formed in the inlet grooves 34, 44 for forming an air circulation structure on their inner surface, these inlet grooves 34, The wire 11 of the voice coil 22 is led through 44.

Air may flow in (or outflow) from the lower part of the frame to the protrusion along the inflow groove, such that air is circulated from the outside to smoothly ensure vibration of the diaphragm and improve sound characteristics.

In addition, although the lead wire of the voice coil arranged in the lower part of the diaphragm is conventionally attached to the diaphragm with the side of the diaphragm, the lead wire is pulled out, and the lead wire is pulled out of the frame and connected to the lower substrate. The wire may be connected to the lower substrate through the inlet groove formed therein.

As a result, wires are attached to the diaphragm to prevent imbalance of vibration characteristics due to differences in weight. In other words, the vibration of the diaphragm can be made uniformly up and down, thereby providing a good sound quality.

The present invention provides a frame of a new structure in which an external air circulation flow path is formed in a micro speaker unit, and draws out the wire of the voice coil through the external air circulation flow path, so that air flows in and out so that the diaphragm can vibrate smoothly. In addition, the wire is attached to the diaphragm to provide an effect that can prevent the distortion vibration caused by the difference in weight.

In addition, the present invention provides a structure to connect the lower substrate and the wire without attaching the wire to the diaphragm of the ultra-small speaker unit to obtain a uniform up and down vibration of the diaphragm, can provide a good sound quality, The sound quality of the compact speaker unit can be improved.

While the invention has been shown and described with respect to particular embodiments, it will be understood that various changes and modifications can be made in the art without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

Claims (8)

tympanum; A magnet arranged in a lower portion of the diaphragm and formed in a ring shape; A frame in which the diaphragm and the magnet are mounted, and at least one inlet groove is formed on an inner side of the diaphragm to allow the outside air to flow along the side of the magnet; A substrate arranged under the magnet and receiving electrical signals from the outside; And And a voice coil arranged at a lower portion of the diaphragm and a central portion of the magnet, and having a wire drawn out along the inflow groove and electrically connected to the substrate. The frame is formed of an upper and a lower frame that can be fitted to each other, the substrate is arranged in the lower portion of the magnet and the inside of the frame, the inlet groove is the upper and lower sides along the sides of the magnet and the substrate Speaker unit having an inner wire drawing structure, characterized in that formed in the frame. The speaker unit of claim 1, wherein the wire of the voice coil is bonded to an inner wall of the inflow groove. delete The method of claim 1, wherein the frame is formed with a protrusion protruding in a predetermined length inward direction to secure a space between the diaphragm and the magnet, the inlet of the inlet groove is formed on the lower side of the protrusion A speaker unit having an internal wire drawing structure. The speaker unit of claim 1, wherein the diaphragm is a biaxially stretched polyethylene naphthalate (PEN) film formed to a thickness of 4.2 to 6 μm. delete According to claim 1, The upper surface of the lower frame is formed with an insert portion having an inner diameter equal to the outer diameter smaller than the outer diameter of the lower frame protruding upwards, The lower inner diameter of the upper frame is formed to be the same as the outer diameter of the insertion portion of the lower frame so that the insertion portion can be inserted, At least one coupling protrusion is formed on an inner side surface of the upper frame and extends in the lower direction of the protrusion. The speaker unit having an internal wire drawing structure, characterized in that at least one coupling groove to which the coupling protrusion is coupled is formed in the insertion portion of the lower frame. The method of claim 1, wherein the frame, And at least one circulation groove formed along a side surface of the magnet from the magnet and the diaphragm so as to circulate air located between the diaphragm and the magnet.

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