KR20050080062A - Ultra slim square micro speaker and the method - Google Patents

Abstract

The present invention relates to an ultra-slim rectangular micro speaker and a method for manufacturing the same, and more particularly, to minimize the width of the rectangular inner and outer ring magnets and yokes, and thus form the voice coils in a square shape. By soldering at, the ultra-slim square can improve the magnetic properties by increasing the magnetic flux chain bridge according to the increase of the length of the speaker to increase the electromagnetic force, as well as reducing the shortening of the diaphragm to improve the acoustic characteristics due to the large vibration force and vibration displacement of the diaphragm. A micro speaker and a method of manufacturing the same.

According to the present invention, a rectangular inner and outer ring magnets are formed by combining one to three of the rectangular yoke, and a voice coil having a rectangular cross section is inserted into the spaced apart space portion of each magnet. An ultra-thin rectangular micro speaker characterized in that the lead-out line which is drawn out is soldered to an FPCB formed outside the frame; A method is provided for insert injection molding the ultra-slim rectangular micro speaker with a magnet or adhesive.

Description

Ultra slim square micro speaker and its manufacturing method {Ultra slim square micro speaker and the method}

The present invention relates to an ultra-slim rectangular micro speaker and a method for manufacturing the same, and more particularly, to minimize the width of the rectangular inner and outer ring magnets and yokes, and thus form the voice coils in a square shape. By soldering at, the ultra-slim square can improve the magnetic properties by increasing the magnetic flux chain bridge according to the increase of the length of the speaker to increase the electromagnetic force, as well as reducing the shortening of the diaphragm to improve the acoustic characteristics due to the large vibration force and vibration displacement of the diaphragm. A micro speaker and a method of manufacturing the same.

Currently, the microspeakers for mobile communication terminals are mostly formed in a circular and elliptical structure, and thus the magnetic circuit also adopts a circular structure.

This type of microspeaker is consistent with the level and performance of mobile communication terminals up to now, but with the emergence of new applications (MP3 / camera) and digital multimedia broadcasting (DMB), the size of the LCD must be increased to increase the space utilization of the speaker. In addition, the need for high performance, high power, and high-quality slim microspeakers is not suitable for multimedia mobile phones.

In other words, the current circular speaker has a limited space efficiency and thus increases the size of the liquid crystal. The elliptical speaker has a circular magnetic field circuit in the slim type, and thus the size of the magnetic circuit components due to the restriction of the short axis portion is not only generated. The acoustic characteristics are not excellent due to the restraint of the diaphragm caused by the voice coil. In other words, in order to reduce the inner diameter of the same resistance, the diameter of the voice coil should be reduced. However, when the diameter of the voice coil is small, the winding width will increase and the sound will touch the yoke, resulting in touch sound. Disconnection occurs due to the heat generated.

In addition, in the conventional speaker structure as described above, since the voice coil lead wire is bonded to the diaphragm, disconnection occurs due to the constraint of the voice coil freedom, making it difficult to reproduce high power, and the adhesion of the voice coil lead wire can be performed only by hand. Difficulties arise in the automated production of speakers.

An object of the present invention is to solve such a problem in the prior art, it is possible to increase the magnetic flux chain bridge due to the square voice coil in a state in which the width of the speaker is minimized, thereby maximizing the electromagnetic force, The lead line of the voice coil is soldered outside the speaker frame to increase the degree of freedom of the voice coil, as well as to insert the insert to facilitate the manufacture of the speaker.

As a means for achieving the above object, a pair of outer ring magnets are positioned on both sides of the inner ring magnet at the center in the long-axis surplus space of the rectangular frame, and a square voice coil is inserted into the spaced space portions of the inner and outer ring magnets. The lead coil of the voice coil is an ultra-slim rectangular micro speaker drawn out to the outside through the empty space of the long axis of the frame without being bonded to the diaphragm,

An object of the present invention is to provide a method for insert injection of the ultra-slim rectangular micro speaker.

Inside the rectangular frame, a yoke, circular or rectangular combination magnet, top plate, and cylindrical diaphragm with diaphragm are inserted in sequence, and the lead wires drawn from the voice coil are soldered inside the frame. In the micro-speaker, a rectangular outer ring magnet is formed on both sides of the rectangular inner ring magnet, and a voice coil having a rectangular cross section is inserted into the spaced space portion of each magnet, and the lead wire drawn out from the voice coil is outside the frame. It is characterized in that it is soldered to the FPCB formed in the.

In the above, the yoke is formed with a protruding surface protruding upward toward the center.

In the above description, two lead wires of the voice coil are opened and collected outside the ventilation holes formed at both ends of the long axis of the frame, and are soldered to the FPCB.

In the above description, two lead wires of the voice coil are opened to the outside of the ventilation hole formed at both ends of the long axis of the frame and soldered to the FPCB.

Inside the rectangular frame, a yoke, circular or rectangular combination magnet, top plate, and cylindrical diaphragm with diaphragm are inserted in sequence, and the lead wires drawn from the voice coil are soldered inside the frame. In the micro-speaker, a pair of square magnets is formed at the upper end of the square fill cap yoke of the cross-sectional "ㅗ" shape with the uneven surface formed at the center, and a center top plate is formed at the upper end of the uneven surface of the square fill cap yoke. The yoke, the magnet and the center top plate are bonded with an adhesive, and a voice coil having a rectangular cross section is inserted into the space between the magnet and the yoke, and the lead wire drawn from the voice coil is soldered to the FPCB formed outside the frame. It is characterized by being processed.

In the above, a plurality of shaft holes are formed at the center of the uneven surface of the yoke.

In the above, square grooves are formed on both sides of the uneven surface of the yoke.

In the above, the yoke, the magnet and the center top plate are bonded by spot welding.

In the above description, two lead wires of the voice coil are opened and collected outside the ventilation holes formed at both ends of the long axis of the frame, and are soldered to the FPCB.

In the above description, two lead wires of the voice coil are opened to the outside of the ventilation hole formed at both ends of the long axis of the frame and soldered to the FPCB.

In the above, the yoke is formed in a plane, and a plurality of shaft holes are formed in the center of the plane yoke.

Inside the rectangular frame, a yoke, circular or rectangular combination magnet, top plate, and cylindrical diaphragm with diaphragm are inserted in sequence, and the lead wires drawn from the voice coil are soldered inside the frame. In the micro-speaker, a rectangular magnet is formed at the upper end of the yoke having a "└┘" shape, and a voice coil having a rectangular cross section is inserted into the space between the magnet and the yoke, and is drawn out from the voice coil. The leader line is characterized in that it is soldered to the FPCB formed outside the frame.

In the above description, two lead wires of the voice coil are opened and collected outside the ventilation holes formed at both ends of the long axis of the frame, and are soldered to the FPCB.

In the above description, two lead wires of the voice coil are opened to the outside of the ventilation hole formed at both ends of the long axis of the frame and soldered to the FPCB.

In the conventional ultra-slim rectangular micro speaker manufacturing method, a pair of outer ring magnets are magnetized on the top of the square filled hat yoke to constrain the square filled hat yoke and the top plate by magnetic force, and the restricted square filled hat yoke, outer ring magnet, and top After placing the plate at the top of the lower mold at once, insert and fix the shaft hole of the square filling hat yoke to the shaft formed at the center of the lower mold, and press the square filling hat yoke, the outer ring magnet, and the top plate with the upper injection mold. Injection molding is characterized in that the injection molding.

In the conventional ultra-slim rectangular micro speaker manufacturing method, the adhesive is applied to the contact surfaces of the square filled hat yoke, the outer ring magnet, and the top plate, and the bound square filled hat yoke, the outer ring magnet, and the top plate are simultaneously placed on the top of the lower mold. After positioning, the shaft hole of the square filler hat yoke is inserted and fixed to the shaft formed at the center of the lower mold, and the square injection hat yoke, the outer ring magnet, and the top plate are pressed into the upper injection mold, and then injection molding is performed. It is characterized by.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention.

1 is a cross-sectional view showing a conventional speaker, Figure 2a is a cross-sectional view showing a speaker formed of three magnets in the present invention, Figure 2b is a combined perspective view showing a coupling state of the speaker formed of three magnets in the present invention, Figure 3 is a cross-sectional view showing a two-way speaker formed of three magnets in the present invention, Figures 4a to 4d is a state diagram showing the lead wire soldering state of the voice coil in the present invention, Figure 5 is formed with two magnets in the present invention Figure 6 is a cross-sectional view showing one speaker, Figure 6 is a cross-sectional view showing a speaker formed of one magnet in the present invention, Figure 7 is a state diagram showing a state in which the speaker of the present invention mounted on a terminal, Figure 8 9 is a comparison graph of electromagnetic force for the prior art, FIG. 9 is a SPL comparison graph for the present invention and the prior art, FIG. 10 is a process diagram showing a process for manufacturing the speaker of the present invention, and FIG. As a process chart showing a process of manufacturing a speaker,

First, in the present invention, a frame, a yoke, a magnet, each top plate, and a voice coil of the speaker are formed in a rectangular shape.

In the case of forming three magnets in the basic structure as described above,

As shown in FIG. 2A or 2B, a ventilation hole 11 is formed at both ends of the long axis A and A ′ of the frame 10, and the protruding surface 21 protrudes upward from the center of the rectangular yoke 20. The inner ring magnet 30 is formed on the top of the protruding surface 21, and the outer ring magnets 40 and 40 ′ are formed on both sides of the yoke 20 on which the protruding surface 21 is not formed. The top plate 50 is seated on the upper end of each of the inner and outer ring magnets 30, 40 and 40 ', and the inner ring magnet 30 is formed opposite to the magnetizing direction of each of the outer ring magnets 40 and 40'. do.

In addition, the inner space and the outer ring magnets 30, 40, 40 'of the spaced apart space portion 1 is inserted into the square voice coil 80 attached to the bottom of the diaphragm 70, the voice coil 80 Two lead wires 81 drawn out in the lead-out direction of the frame 10 are pulled out in the direction of the short axis (B) (B ') and soldered to the outside of the frame 10, where shown in FIGS. 4A to 4B. Likewise, the two lead wires 81 surround the outside of the ventilation hole 11 formed in the frame 10, that is, open the lead wire 81 at the starting point of the ventilation hole 11 and then again at the end point of the ventilation hole 11. The solder 82 may be collected in the FPCB 83 or the solder 82 may be processed in the FPCB 83 as it is, without collecting the lead wires 81 formed at the starting point of the ventilation hole 11 again.

In other words, in the related art, since the structure of the FPCB 83 is attached to the frame 10 in advance to attach the diaphragm 70 and the magnet and yoke are assembled at the end, there is not much space between the diaphragm 70 and the frame 10. Therefore, the FPCB 83 is soldered 82 inside the diaphragm 70 seating portion 12 of the frame 10 to impart a degree of freedom, but according to the present invention, the frame of the long axis portion in which the magnetic field circuit is not formed ( 10), but because the space can be placed in the lower portion where the interference with the ventilation hole 11 does not occur, it is possible to give a greater degree of freedom than conventional.

In addition, as shown in FIG. 3, two-way speakers may be formed through three magnets. In this case, the inner ring magnet 30 is centered on the bottom surface of the rectangular mica yoke 20 '″, and the outer ring magnet 40 is formed on both sides of the upper surface. ) 40 ', and then combines the diaphragm 70 formed with a square voice coil 80 up and down, and the leader line 81 drawn from the voice coil 80 is mentioned above. It can be formed in the same manner as one.

In the case of forming two magnets in the basic structure,

As shown in FIG. 5, first, the ventilation holes 11 are formed at both ends of the long axis A and the A 'of the frame 10, and the uneven surface protrudes upward toward the center of the rectangular square hat yoke 20 ′. 21 'and a plurality of shaft holes 22' are formed on the uneven surface 21 '. At this time, the square groove 23 'may be formed on the upper surface of the square filling hat yoke 20' on both sides of the uneven surface 21 '.

The outer ring magnets 40 and 40 'are respectively formed on both sides of the rectangular filled hat yoke 20' where the uneven surface 21 'is not formed, wherein the uneven surface 21' and the outer ring magnet 40 are respectively formed. Between the 40 ', a predetermined spaced part 1 is formed.

The top plate 50 is seated on top of the outer ring magnets 40 and 40 ', and the top plate 50 is not only to the outer ring magnets 40 and 40' but also to the top of the uneven surface 21 '. A separate top plate 50 'is seated.

In addition, after inserting the rectangular voice coil 80 attached to the bottom of the diaphragm 70 into the spaced space portion 1 of each of the outer ring magnets 40 and 40 ', the leader line drawn out from the voice coil 80 is inserted. (81) Solder 82 is treated in two ways in the same manner as in the speaker using the three magnets above.

The speaker thus formed is a magnetic flux generated from the outer ring magnet 40, 40 'when the ride on the top plate 50, when the space (1) with the voice coil 80 to go to the center top plate 50' Since the center top plate 50 'protrudes from below, the magnetic flux flows in a vertical component in the current direction.

In the case of forming one magnet in the basic structure,

As shown in FIG. 6, first, the ventilation holes 11 are formed at both ends of the long axis A (A ′) of the frame 10, and a single rectangular shape is formed inside the yoke 20 having a cross section of “└┘”. The magnet 30 'is inserted. At this time, a predetermined spaced part 1 is formed between both sides of the single magnet 30' and the yoke 20 ", and then the top plate (top) is formed on the top of the single magnet 30 '. Seat 50).

In addition, after inserting the rectangular voice coil 80 attached to the bottom surface of the diaphragm 70 in the separation space (1), the two magnetic wires 81 drawn from the voice coil 80 to the three magnets Solder 82 is treated in the same manner as in the speaker used.

As described above, the speaker having one to three rectangular magnets and the voice coil 80 formed saga form not only can reduce the size of the short axis (up to about 8 mm) more than conventional, but also each magnet and voice. As the length of the shortened portion of the coil 80 can be adjusted, the area of the side dome and the central dome of the diaphragm 70 can be easily adjusted, and the low frequency characteristics can be improved, and thus the acoustic characteristics can be improved.

Furthermore, since the long axis of the voice coil 80 can be lengthened, the length of the voice coil 80 can be increased, so that the wire diameter of the voice coil 80 can be increased, so that reliability problems do not occur and the long coil length of the voice coil 80 is long. It is possible to increase the electromagnetic force while increasing the flux linkage.

8 or 9 compares the electromagnetic force and the SPL graph of the slim rectangular speaker of the present invention and the speaker employing the conventional circular magnetic circuit, and it can be seen that the slim rectangular speaker of the present invention is excellent in the same dimensions.

Referring to the injection molding method for manufacturing the ultra-slim rectangular micro speaker of the above structure in more detail,

First, in the case of the circular and elliptical microspeakers of the conventional circular magnetic circuit structure form is already manufactured by insert injection structure. In the case of the present invention, insert injection is not easy due to some problems. That is, in the case of the circular magnetic circuit, the yoke in the form of a flat plate has two small holes, and the shaft 91 is inserted and fixed in the lower mold 90 to prevent it from being separated during the injection mold. When the protrusion of the upper mold enters the inner hole, all directions in the radial direction are constrained to prevent the magnet and the top plate from being separated.

The present invention is formed of a square magnetic circuit, and when the injection mold as described above, the separation of the square filling hat yoke (20 ') and the outer mold inside the upper mold of the outer ring magnet (40, 40') and the top plate 50 is prevented Although it can be, the outer mold of the outer ring magnet 40, 40 'and the top plate 50 of the outer mold outside the separation can not be prevented.

Accordingly, in the present invention, as shown in FIG. 10, the outer ring magnets 40 and 40 'and the top plate 50 are magnetized to the top of the square-filled hat yoke 20', and the shaft 91 is formed around the center. Is inserted into the lower mold 90, wherein the shaft hole 22 'of the square filling hat yoke 20' is inserted into and fixed to the shaft 91 of the lower mold 90.

The upper mold 90 'is pressed after the square filling hat yoke 20', the outer ring magnets 40, 40 ', and the top plate 50 are fixed to the lower mold 90, and then the upper mold ( 90 ') and the molding is injected into the space portion of the frame 10 generated when the lower mold 90 is coupled, and then injection molded into one frame assembly.

In the above, the square-filled hat yoke 20 ', the outer ring magnet 40, 40', and the top plate 50 are first magnetized and then inserted into the lower mold 90, as shown in FIG. Likewise, after the adhesive 60 is applied to the contact surfaces of the quadrangular hat yoke 20 ', the outer ring magnets 40 and 40', and the top plate 50, they may be adhesively fixed to each other.

The insert injection method as described above may be applied to the flat yoke as well as the square-filled yoke 20 '.

Thus, the present invention forms a rectangular magnet in the surplus space of the frame, the length of the long axis direction of the voice coil is increased as the voice coil is formed into a rectangle, thereby increasing the magnetic flux chain bridge and electromagnetic force to use a single circular magnet High performance reproduction is possible compared to microspeakers. In addition, since the lead wire of the voice coil is soldered outside the frame without being bonded to the diaphragm, the degree of freedom of the voice coil lead wire can be increased. That is, the present invention not only facilitates the space utilization of the terminal by slimming the speaker as much as possible, thereby increasing the design flexibility of the terminal.

1 is a cross-sectional view showing a conventional speaker

Figure 2a is a cross-sectional view showing a speaker formed of three magnets in the present invention

Figure 2b is a perspective view showing a coupling state of the speaker formed of three magnets in the present invention

Figure 3 is a cross-sectional view showing a two-way speaker formed of three magnets in the present invention

Figure 4a to 4d is a state diagram showing the lead wire soldering state of the voice coil in the present invention

5 is a cross-sectional view showing a speaker formed of two magnets in the present invention.

6 is a cross-sectional view showing a speaker formed of one magnet in the present invention.

Figure 7 is a state diagram showing a state in which the speaker of the present invention mounted on the terminal

Figure 8 is a comparison graph of electromagnetic force for the present invention and the prior art

9 is a SPL comparison graph for the present invention and the prior art

10 is a process chart showing a process of manufacturing the speaker of the present invention.

11 is a process chart showing a process of manufacturing the speaker of the present invention.

<Description of the symbols for the main parts of the drawings>

1: space part 10: frame 11: ventilation hole

12: seating portion 20, 20 ', 20 ": yoke 21: protruding surface

21 ': Uneven surface 22': Shaft hole 23 ': Square groove

30: inner ring magnet

40,40 ': Outer ring magnet 50: Top plate 70: Diaphragm

80: voice coil 81: leader line 82: soldering

83: FPCB 90: lower mold 90 ': upper mold

91: shaft A, A ': long axis B, B': short axis

Claims (16)

Inside the rectangular frame, a yoke, circular or rectangular combination magnet, top plate, and cylindrical diaphragm with diaphragm are inserted in sequence, and the lead wires drawn from the voice coil are soldered inside the frame. In the micro-speaker, a rectangular outer ring magnet is formed on both sides of the rectangular inner ring magnet, and a voice coil having a rectangular cross section is inserted into the spaced space portion of each magnet, and the lead wire drawn out from the voice coil is outside the frame. An ultra-slim rectangular micro speaker, which is soldered to an FPCB formed in the. The ultra-slim rectangular micro speaker according to claim 1, wherein the yoke has a protruding surface protruding upward toward the center. The ultra-slim rectangular micro-speaker according to claim 1, wherein two lead wires of the voice coil are formed outside the ventilation holes formed at both ends of the long axis of the frame and are soldered to the FPCB. The ultra-slim rectangular micro-speaker according to claim 1, wherein two lead wires of the voice coil are opened to the outside of the ventilation hole formed at both ends of the long axis of the frame and soldered to the FPCB. Inside the rectangular frame, a yoke, circular or rectangular combination magnet, top plate, and cylindrical diaphragm with diaphragm are inserted in sequence, and the lead wires drawn from the voice coil are soldered inside the frame. In the micro-speaker, a pair of square magnets is formed at the upper end of the square fill cap yoke of the cross-sectional "ㅗ" shape with the uneven surface formed at the center, and a center top plate is formed at the upper end of the uneven surface of the square fill cap yoke. The yoke, the magnet and the center top plate are bonded with an adhesive, and a voice coil having a rectangular cross section is inserted into the space between the magnet and the yoke, and the lead wire drawn from the voice coil is soldered to the FPCB formed outside the frame. Ultra-slim characterized by being processed Square micro speaker. The ultra-slim rectangular micro speaker according to claim 5, wherein a plurality of shaft holes are formed at the center of the uneven surface of the yoke. The ultra-slim rectangular micro speaker according to claim 5, wherein square grooves are formed at both sides of the uneven surface of the yoke. 6. The ultra slim rectangular micro speaker according to claim 5, wherein the yoke, the magnet and the center top plate are bonded by spot welding. 6. The ultra-slim rectangular micro-speaker according to claim 5, wherein the two lead wires of the voice coil are formed outside the ventilation holes formed at both ends of the long axis of the frame and are soldered to the FPCB. 6. The ultra-slim rectangular micro speaker according to claim 5, wherein two lead wires of the voice coil are spread out outside the ventilation holes formed at both ends of the long axis of the frame and soldered to the FPCB. 6. The ultra-slim rectangular micro speaker according to claim 5, wherein the yoke is formed in a plane, and a plurality of shaft holes are formed at the center of the plane yoke. Inside the rectangular frame, a yoke, circular or rectangular combination magnet, top plate, and cylindrical diaphragm with diaphragm are inserted in sequence, and the lead wires drawn from the voice coil are soldered inside the frame. In the micro-speaker, a rectangular magnet is formed at the upper end of the yoke having a "└┘" shape, and a voice coil having a rectangular cross section is inserted into the space between the magnet and the yoke, and is drawn out from the voice coil. An ultra-slim rectangular micro speaker, wherein the leader line is soldered to an FPCB formed outside the frame. The ultra-slim rectangular micro-speaker according to claim 12, wherein two lead wires of the voice coil are formed outside the ventilation holes formed at both ends of the long axis of the frame and are soldered to the FPCB. The ultra-slim rectangular micro-speaker according to claim 12, wherein the two lead wires of the voice coil are spread out outside the ventilation holes formed at both ends of the long axis of the frame and soldered to the FPCB. In the conventional ultra-slim rectangular micro speaker manufacturing method, a pair of outer ring magnets are magnetized on the top of the square filled hat yoke to constrain the square filled hat yoke and the top plate by magnetic force, and the restricted square filled hat yoke, outer ring magnet, and top After placing the plate at the top of the lower mold at once, insert and fix the shaft hole of the square filling hat yoke to the shaft formed at the center of the lower mold, and press the square filling hat yoke, the outer ring magnet, and the top plate with the upper injection mold. Ultra-slim rectangular micro speaker manufacturing method characterized in that the injection molding by injection molding. In the conventional ultra-slim rectangular micro speaker manufacturing method, the adhesive is applied to the contact surfaces of the square filled hat yoke, the outer ring magnet, and the top plate, and the bound square filled hat yoke, the outer ring magnet, and the top plate are simultaneously placed on the top of the lower mold. After positioning, the shaft hole of the square filler hat yoke is inserted and fixed to the shaft formed at the center of the lower mold, and the square injection hat yoke, the outer ring magnet, and the top plate are pressed into the upper injection mold, and then injection molding is performed. Ultra-slim rectangular micro speaker manufacturing method characterized in that.