KR100691746B1 - speaker unit with air flow structure - Google Patents

Abstract

The present invention relates to a speaker unit that is used for a speaker function in a small acoustic device such as an earphone or a personal mobile communication device, and has an air circulation structure that passes through the diaphragm at the rear of the speaker unit so as to realize a micro size. The present invention includes an upper frame having a protrusion projecting inwardly and an upper inlet groove formed from an inner side to a lower surface of the lower portion of the protrusion; A lower frame having an insertion portion inserted into a lower portion of the upper frame on an upper surface thereof, and having a lower inflow groove formed in an up and down direction on an inner surface thereof to be connected to the upper inflow groove to form one air circulation passage; A diaphragm arranged above the protrusion of the upper frame and having a voice coil below; A magnet formed in a ring shape so that the voice coil is located inside and arranged to contact the protrusion and the inner surfaces of the upper and lower frames; A yoke supporting the magnet; And a substrate arranged under the yoke and electrically connected to the diaphragm to apply an electrical signal. It provides a speaker unit having an air circulation structure comprising a.

Speaker, Microminiature, Diaphragm, Magnet, Inflow Groove, Circulation Groove

Description

Speaker unit with air circulation structure {speaker unit with air flow structure}

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

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

Figure 3 is a perspective view of the upper and lower frames of the speaker unit according to the present invention.

4 is a bottom view of the upper frame of FIG. 3.

5 (a) and 5 (b) are a bottom view and a plan view of the lower frame of FIG. 3.

6 is a view illustrating a state in which the upper and lower frames of FIG.

FIG. 7 is a view illustrating a coupling state of the upper and lower frames of FIG.

8 is a partially cutaway perspective view illustrating a state in which an air circulation passage is formed in the speaker unit according to the present invention.

9 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.

10 is a partially cutaway perspective view showing an assembled state according to a second embodiment of a speaker unit according to the present invention.

11 is a cross-sectional view showing a state of formation of air circulation passages according to the second embodiment of the speaker unit according to the present invention.

Explanation of symbols on the main parts of the drawings

15: magnet 21: diaphragm

22: voice coil 25: yoke

26: substrate 31: upper frame

32: engaging projection 34: upper inlet groove

35: protrusion 37: circulation groove

41: lower frame 42: insertion portion

43: coupling groove 44: lower inlet groove

51: grill

The present invention relates to a speaker unit that is used for a speaker function in a small acoustic device such as an earphone or a personal mobile communication device, and has an air circulation structure that passes through the diaphragm at the rear of the speaker unit so as to realize a micro size.

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 conducting wires 9.

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).

The present invention is to solve the above problems, to provide a frame of a new structure in which the external air circulation flow path is formed in the compact speaker unit to ensure a smooth vibration of the diaphragm and thereby to provide a high quality sound quality. do.

In addition, an external air inlet groove and an internal air circulation groove are formed in the micro speaker unit to expand the air inflow and outflow paths of the internal air to ensure smooth vibration of the diaphragm and thereby improve sound characteristics. It is an object to provide a speaker unit.

As a constituent means for achieving the above object, the present invention includes an upper frame having a protrusion projecting inwardly and an upper inlet groove formed from the inner side of the lower portion of the protrusion; A lower frame having an insertion portion inserted into a lower portion of the upper frame on an upper surface thereof, and having a lower inflow groove formed in an up and down direction on an inner surface thereof to be connected to the upper inflow groove to form one air circulation passage; A diaphragm arranged above the protrusion of the upper frame and having a voice coil below; A magnet formed in a ring shape so that the voice coil is located inside and arranged to contact the protrusion and the inner surfaces of the upper and lower frames; A yoke supporting the magnet; And a substrate arranged under the yoke and electrically connected to the diaphragm to apply an electrical signal. It provides a speaker unit having an air circulation structure comprising a.

Preferably the upper inlet groove of the upper frame is formed from a portion of the protrusion to the lower surface of the upper frame. In addition, 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, it characterized in that the insertion portion can be inserted. In this case, a coupling protrusion extending in the lower direction of the protrusion may be formed on the inner side of the upper frame, and a coupling groove to which the coupling protrusion may be coupled may be formed in the insertion portion of the lower frame.

In addition, the upper frame is formed with a circulation groove formed from a portion of the protrusion to the lower surface of the upper frame, the lower portion of the circulation groove is blocked by the insertion portion of the lower frame circulation formed in the protrusion Allow air to circulate through the groove inlet. In this case, the inlet groove and the circulation groove may be formed as a boundary between the coupling protrusion, and the coupling protrusion may be formed to extend from the lower surface of the protrusion to the lower surface of the upper frame.

In another aspect, the present invention is a diaphragm having a voice coil at the bottom; A magnet formed in a ring shape such that the voice coil is located inside; A substrate arranged under the magnet and electrically connected to the diaphragm to apply an electrical signal; And a frame in which the diaphragm, the magnet, and the substrate are mounted, and a frame having an inlet groove for introducing external air along the side surfaces of the magnet and the substrate on an inner side thereof.

Preferably, the frame may be formed with a circulation groove formed along the side of the magnet from between the magnet and the diaphragm so as to circulate air located between the diaphragm and the magnet. At this time, the frame is formed of an upper and lower frame that can be fitted to each other, the upper surface of the lower frame forms a lower surface of the circulation groove, the inlet groove may be formed in the upper and lower frames, respectively.

In addition, the upper frame is preferably formed with a protrusion protruding inwardly in order to secure a space between the diaphragm and the magnet, the inlet and the inlet of the circulation groove is formed on the lower side of the protrusion.

In this case, preferably, the upper surface of the lower frame is formed with an insertion portion having an inner diameter equal to an outer diameter smaller than the outer diameter of the lower frame to protrude upward, and the lower inner diameter of the upper frame is the same as the outer diameter of the insertion portion of the lower frame. Is formed so that the insertion portion can be inserted, the inner surface of the upper frame is formed with a coupling protrusion extending in the downward direction, the insertion portion of the lower frame coupling groove to which the coupling projection is coupled Is formed.

In addition, the inlet groove and the circulation groove are formed to border the coupling groove with each other, the coupling groove is formed to extend from the lower surface of the protrusion to the lower surface of the upper frame.

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, and a biaxially stretched polyester (Polyethylen Naphthalate (PEN)) film is used.

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.

Figure 3 is a perspective view of the upper and lower frames of the speaker unit according to the present invention. Frames 31 and 41 of the present invention may be assembled into separate upper frame 31 and 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.

The upper frame 31 is also formed with at least one upper inlet groove 34. The upper 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 external. It acts as a passageway to allow the gas to 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 to fix the position 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. 31 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 engaging 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. .

4 is a bottom view of the upper frame of FIG. 3, and FIGS. 5A and 5B are a bottom view and a plan view of the lower frame of FIG. 3. In FIG. 4, the protrusion 35 and the coupling protrusion 32, the stepped portion 33, and the inflow groove 34 are illustrated. 5 (a) is a bottom view of the lower frame 41, the lower inlet groove 44 is shown, Figure 5 (b) is a plan view of the lower frame 41, the lower inlet groove 44 and the insertion portion An engaging groove 43 of 42 is shown.

6 is a view showing a state in which the upper and lower frames of FIG. 3 are combined with respect to the inlet groove, and FIG. 7 is a view showing a state in which the upper and lower frames of FIG. The speaker unit of the present invention will have a frame formed of the upper and lower frames as shown in Figs. The loudspeaker unit of the present invention is manufactured by being separated up and down and combined to form a single outer frame, which makes 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.

8 is a partially cutaway perspective view illustrating a state in which an air circulation passage is formed in the speaker unit according to the present invention. The speaker unit according to the present invention is formed of the upper frame 31 and the lower frame 41, the inlet grooves 34 and 44 for forming an air circulation structure on their inner surface is formed. The inflow grooves 34 and 44 are formed on the inner wall surface of the frame to the outside of the magnet 15, and air may flow in (or outflow) from the lower portion of the frame to the protrusion along the inflow grooves 34 and 44.

As the size of the speaker unit used in an ultra-small product (earphone or personal communication device) is miniaturized, when an air circulation passage with the outside is formed on the inner wall of the frame as described above, air is circulated from the outside to vibrate the vibration plate. It can be guaranteed smoothly. In addition, the transfer of sound from the diaphragm to the outside is also facilitated. In addition, by adjusting the size of the inflow groove, it is possible to adjust the vibration frequency characteristics of the diaphragm of the speaker unit. That is, it is possible to adjust the amount of air introduced to improve the vibration characteristics in a specific region.

In the first embodiment of the present invention, the outer frame is composed of the upper and lower frames, 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.

9 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 at a predetermined width under the protrusion, and the 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. It is formed, and the boundary between these inlet grooves and the circulation grooves is to form a coupling 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 formed so as not to circulate 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. In addition, the air circulation path is extended so that the vibration frequency of the diaphragm is uniform, and a function of securing a smooth vibration space is provided.

10 is a partially cutaway perspective view showing an assembled state according to a second embodiment of a speaker unit according to the present invention. As shown in FIG. 10, when the upper frame 31 and the lower frame 41 are coupled, the inlet portion 34 and the inlet portion of the circulation groove 37 formed in the lower portion by the magnet 15 and the protrusion 35 are magnets. It is formed on the top.

In the first and second embodiments, two or more inflow grooves 34 and 44 and circulation grooves 37 may be formed, respectively, and the number of formation of these grooves may be changed by design according to sound characteristics.

The present invention forms an inlet groove to enable the outside air inflow and outflow on the inner surface of the frame of the compact speaker unit, to enable the circulation of air to the outside to ensure smooth vibration of the diaphragm, thereby Sound quality was provided.

In addition, an external air inlet groove and an internal air circulation groove are formed in the micro speaker unit to expand the air inflow and outflow paths of the internal air to ensure smooth vibration of the diaphragm and thereby improve sound characteristics. Provide effect.

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 (12)

An upper frame having a protrusion protruding inward and an upper inlet groove formed from an inner side to a lower surface of the lower portion of the protrusion; A lower frame having an insertion portion inserted into a lower portion of the upper frame on an upper surface thereof, and having a lower inflow groove formed in an up and down direction on an inner surface thereof to be connected to the upper inflow groove to form one air circulation passage; A diaphragm arranged above the protrusion of the upper frame and having a voice coil below; A magnet formed in a ring shape so that the voice coil is located inside and arranged to contact the protrusion and the inner surfaces of the upper and lower frames; A yoke supporting the magnet; And A substrate arranged under the yoke and electrically connected to the diaphragm to apply an electrical signal; Speaker unit having an air circulation structure comprising a. The speaker unit of claim 1, wherein the upper inlet groove of the upper frame is formed from a portion of the protrusion to a lower surface of the upper frame. The speaker unit of claim 1, wherein the lower inner diameter of the upper frame is the same as the outer diameter of the insert of the lower frame so that the insert can be inserted therein. According to claim 3, wherein the inner surface of the upper frame is formed with a coupling protrusion extending in the lower direction of the protrusion, the insertion portion of the lower frame is characterized in that the coupling groove to which the coupling projection is coupled is formed. Speaker unit having an air circulation structure. According to claim 4, The upper frame is formed with a circulation groove formed from a portion of the protrusion to the lower surface of the upper frame, the lower portion of the circulation groove is blocked by the insertion portion of the lower frame is formed in the protrusion Speaker unit having an air circulation structure, characterized in that for circulating the air through the inlet of the circulation groove. 6. The air circulation structure according to claim 5, wherein the inflow grooves and the circulation grooves are formed to border the coupling protrusions, and the coupling protrusions extend from the lower surface of the protrusion to the lower surface of the upper frame. Speaker unit having a. A diaphragm having a voice coil at the bottom; A magnet formed in a ring shape such that the voice coil is located inside; A substrate arranged under the magnet and electrically connected to the diaphragm to apply an electrical signal; And The diaphragm, the magnet and the substrate is mounted, the speaker unit having an air circulation structure including a frame formed on the inner side inlet grooves for introducing external air along the sides of the magnet and the substrate. The method of claim 7, wherein the frame, And a circulation groove formed along the side of the magnet from the magnet and the diaphragm so as to circulate air located between the diaphragm and the magnet. The method of claim 8, wherein the frame is formed of an upper and lower frames that can be fitted to each other, the upper surface of the lower frame forms a lower surface of the circulation groove, the inlet grooves are respectively in the upper and lower frames Speaker unit having an air circulation structure, characterized in that formed. The method of claim 9, The upper frame is provided with a protrusion protruding inwardly in order to secure a space between the diaphragm and the magnet, the inlet and the inlet of the circulation groove is formed in the lower side of the protrusion air circulation structure Speaker unit having a. 10. The method of claim 9, wherein the upper surface of the lower frame is formed with an insertion 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, The inner side of the upper frame is formed with a coupling protrusion extending in the lower direction, Speaker unit having an air circulation structure, characterized in that the insertion portion of the lower frame is formed with a coupling groove to which the coupling projection is coupled. 12. The air circulation structure according to claim 11, wherein the inflow grooves and the circulation grooves are formed to border the coupling grooves, and the coupling grooves are formed to extend from the lower surface of the protrusion to the lower surface of the upper frame. Speaker unit having a.

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