MXPA00000716A - Miniature loudspeaker and its manufacturing method - Google Patents

Abstract

The use of resin moulded into coaxial holes in three components simplifies assembly. The microphone includes a magnet (102) and a stirrup (103). An upper plate (101) and a connection part are linked together during formation of a structure (105) in order to shorten the procedure for formation of a magnetic circuit (150). Three holes (112) are formed at the centre of the upper plate (101), at the centre of the magnet (102) and at the centre of the stirrup (103). A moulding resin is then injected into these holes fixing these components together. A connection part is formed on one side of the stirrup (103) and a vibrating membrane (108) as well as a mobile coil (107) are glued to the lower part of the structure. A protective cover (111) is then attached.

Description

MICRO-SPEAKER AND MANUFACTURING METHOD OF THE SAME DESCRIPTION OF THE INVENTION The present invention relates to a micro-loudspeaker and a method for manufacturing it, in which a magnet, a stock, an upper and a terminal part are unified during the formation of a frame for shorten the process for the formation of a magnetic circuit and the terminal part, furthermore a fixing recess is formed in a lower edge of the frame, and a protective cover is formed having a fixing step to be fixed in the recess to shorten significantly the process of forming protective cover, whereby the frame and the protective cover are made to fit firmly together. Figure 1 illustrates a generally known conical speaker. As shown in this drawing, the loudspeaker includes: a magnetic circuit 70 having an upper plate 77 for generating magnetic fluxes, the upper plate 77 is stacked on the upper part of the magnet 73 and a cylinder head 75, and the cylinder head 75 accommodates the magnet 73; a vibration system 80 that includes a coil 84 inserted into a space and having a moving coil 82 to generate magnetic fluxes by supplying an electric current to the moving coil 82, and the system 80 further includes a shock absorber 86, a vibration plate 88, a dust insulating cap and a edge 85 for generating vibrations when reacting to the magnetic fluxes of the magnetic circuit 70; and a main body 90 that includes; a frame 91 for securing the magnetic circuit 70 and the vibration system 80; a seal 93 for securing one end of the vibration plate 88 to the frame 91; and a terminal board 95 disposed on the frame 91 to provide power to the moving coil of the vibration system 80. As shown in Figure 2, such a micro loudspeaker (15 mm speaker) is manufactured in the following manner. That is, during the formation of a U-shaped frame 51, an insert injection molding is made to integrally form a stock 52. (First the stock 52 with protuberances 63 are installed in the center of the inner bottom of the frame 51 , and then, a molding resin is injected around the cylinder head 52). In this way, the frame 51 and the stock 52 are integrally formed, and cured. Under this condition, a recess is formed on one side of the frame 51 to receive a terminal part. Then, a PCB 60 is joined with a contact 61 in the recess which has been formed in the frame 51. In addition, the stock has a diameter of 9 mm, and inside the stock 52, an upper plate 54 and a stack are stacked. magnet 53, maintaining a space within the internal diameter of the cylinder head 52.

The upper plate 54 with a diameter of 6.8 mm and the magnet 53 with a diameter of 6.5 mm are bonded together using 0.0005 g ± 20% of an adhesion material. The magnet 53 and the cylinder head 52 are joined together using 0.001 g ± 20% of an adhesion material. Then they are pressed and dried, so that the assurance operation is completed. The adhesion material for coupling the magnet 53 and the upper plate 54 usually cures quickly, and therefore, exact positioning is difficult. That is to say, the adhesive that cures fast has no impact on the resistance and the rubber bond has no resistance to heat. Therefore, they are not suitable, and therefore, harloc glue is used which meets the requirements mentioned above and has a fast drying property. A DB 57 adhesion material is then sprayed onto the bottom edge of a vibration plate 56 having a moving coil 55 within the space. Then the vibration plate 56 is attached to the inner part of the frame. In addition, the bonding material DB 57 is also sprayed on the upper part of the vibration plate 56, and then, a cover 58 is attached to the upper part of the vibration plate 56. Then a pressure and drying is performed, so that the assurance operation is completed. The mobile coil 55 is then electrically connected to a contact 61 of a PCB 60, whereby the micro-loudspeaker is completed. In this conventional micro loudspeaker, if power is supplied from the PCB 60 to the moving coil 55, the vibration plate 56 moves up and down due to the flow direction of the cylinder head 52 and the upper plate 54 (which are magnetized by the magnet 53), and due to the electrical current of the moving coil 55. Accordingly, the vibration plate 56 on which the moving coil 55 is attached is vibrated, and in this way, sounds are generated due to the pressure difference as against the external air. In addition, the cover 58 having an air flow passage 59 for protecting the internal components of the frame 51 is attached to the upper part of the vibration plate 56. However, in the conventional micro loudspeaker as described above, it has to be attached a separate PCB 60 to the side of the frame 51 to supply signals to the loudspeaker, and therefore, the manufacturing process steps are increased. In addition, when the magnet 53 and the upper plate are joined to the cylinder head 52 while maintaining a space, a dilution is made with a different adhesion material, and therefore, the operation becomes difficult. In addition, accurate dilution becomes difficult, and therefore the reliability of the bond becomes worse.

In addition, the magnetic circuit is formed by the spraying of the adhesion material, the dilution of the adhesion material, the pressure and drying and the like. Therefore, the number of process steps is increased, and furthermore, during the rotation of the components to make the dilution it becomes difficult to precise centering. In this way, the central defects with occurrence of products of frequency defects are frequent. In addition, during the spraying of the adhesion material, the adhesion material is filtered inside, and therefore, the space defects become numerous. In addition, the cover 58 that is secured by being inserted into the frame 51 is secured by the adhesion material 57 that is sprayed on the vibration plate 56. Therefore, if the spraying of the adhesion material 57 is excessive, a split resonance. In addition, the cover 58 has to be held in the upper part of the frame 51 until the curing of the adhesion material, and therefore, the number of the process steps is increased. The present invention is proposed to solve the above described disadvantages of the conventional technique. It is therefore an object of the present invention to provide a loudspeaker and a method for manufacturing it, in which a magnet, a cylinder head, a top plate and a terminal part are unified during the formation of a frame to shorten the process for In addition, a magnetic circuit and the terminal part are formed, as well as preventing spraying of the adhesion material (as well as coupling the frame and firm protective cover) to avoid split resonances, and any loosening movements of the protective cover. they avoid due to their securing to the frame to eliminate a separate cover securing step during the curing of the adhesion material. In achieving the above object, the micro loudspeaker according to the invention includes: a top plate having a through hole in its center; a magnet installed in its center coaxially with the through hole of the upper plate; a cylinder head having a U-shape for receiving the upper plate and the magnet with a space formed between an inner diameter of the cylinder head and the external diameters of the upper plate and the magnet to form a magnetic circuit; and having a through hole in its center coaxially with the through holes of the upper plate and the magnet; a frame formed around the cylinder head, and having a substantially perpendicular securing protrusion projecting upwards from a lower part of the frame to pass through the through holes and secure the magnetic circuit; a vibration plate with its lower edge portion attached to an inner lower part of the frame using an adhesion material; a moving coil attached to the bottom of the vibration plate and inserted into the space of the cylinder head; and a terminal part installed on one side of the frame and connected to the voice coil to supply external signals to the voice coil. In another aspect of the present invention, the method for manufacturing the micro loudspeaker according to the present invention includes the steps of: forming through holes in a top plate, a magnet and a head to form a magnetic circuit; forming a terminal part by connecting one end of a moving coil to a terminal part, the terminal part being disposable by cutting a notch part; forming a frame by injecting a molding resin into the through holes of the magnetic circuit and around the stock and the terminal part after installing the terminal part on one side of the stock, to unify the magnetic circuit and the terminal part; attaching a lower edge portion of a vibration plate to an inner bottom side of the frame using an adhesive material to make ends of the moving coil extending out of the frame, securing a protective cover to an outer side of the frame close to the frame; connect the mobile coil by welding ends of the voice coil to the end pieces; and forming a ground terminal to make the terminal ground projection down one side of the terminal part of the terminal part. BRIEF DESCRIPTION OF THE DRAWINGS The above object and other advantages of the present invention will become apparent upon describing in detail the preferred embodiment of the present invention with reference to the accompanying drawings in which: Figure 1 schematically illustrates the general conical speaker; Figure 2 is a schematic sectional view of the conventional micro loudspeaker; Figures 3A, 3B and 3C illustrate the coupled state of the micro loudspeaker according to the present invention; Figures 4A and 4B schematically illustrate the junction state of the terminal part of Figure 3; Figures 5a, 5B and 5C illustrate the coupled state of another embodiment of the micro-loudspeaker according to the present invention; Figures 6A and 6B illustrate a critical portion showing the installed state of the terminal part of Figure 5; Figure 7 schematically illustrates the manufacturing process of the loudspeaker according to the present invention; Figure 8 is a sectional view showing the manufacturing process for the micro loudspeaker according to the present invention; Figures 9A and 9B are sectional views showing the coupling process for the magnetic circuit of the micro loudspeaker according to the present invention; and Figure 10 illustrates schematically the terminal part of the micro loudspeaker according to the present invention. Figures 3A, 3B and 3C illustrate the coupled state of the loudspeaker according to the present invention. Figures 4A and 4B schematically illustrate the state of attachment of the terminal portion of Figure 3. The present invention includes a frame 105, a vibration plate 108 and an end portion 140, the vibration plate 108 is installed within the frame 105 A magnetic circuit 150 includes an upper plate 101, a magnet 102, and a cylinder head 103, and these elements 101, 102, and 103 respectively have a through hole 112 with the same diameter. A securing protrusion 170 projects upwardly from the bottom of the frame 105 to pass through the through holes 112 of the elements 101, 102 and 103. The securing protrusion 170 is injection molded using a non-magnetic material. Under the vibration plate 108 which is installed within the frame 105, a moving coil 107 is disposed, with its guide line extending to the outside of the frame 105. The lower edge of the vibration plate 108 joins to the inner bottom of the frame 105 when using an adhesion material DB 109. In addition, a round recess 106 is formed around the outer bottom edge of the frame 105, by fixing a fixing step 110 of the protective cover 111 made of a material of plastic. further, a terminal locking recess 141 is formed in the lower edge of the frame 105 to fix the terminal part 140. Alternatively, the protective cover 111 of a high permeability metal is made, and is provided with a caulking portion 160 to be fixed to the fixing recess 106. The terminal part 140 is fixed to the terminal locking recess 141 which is connected through an elastic connector 142 to one end of the voice coil 107, and which is attached to a circuit board 145 using a bonding material 109. The first embodiment of the present invention constituted as above will now be described as to its action and effects. With reference to Figures 3 and 4, descriptions will be made for the case where the frame 105 is made of a non-magnetic resin around the magnetic circuit 150 which generates magnetic fluxes through the cylinder head 103 and the upper plate 101. There is a securing boss 170 passing through the through holes of the head 103 and the top plate 101. In this case, the injected molding resin is filled in the through holes 112 of the top plate 101, the magnet 102 and the stock 103 to be cured in the securing protrusion 170. This is formed through a single process step in which the other elements are formed simultaneously. The securing protrusion 170 has an expanded portion for supporting the upper plate 101, the magnet 102 and the yoke 103, and preventing said elements from separating. The moving coil 107 is disposed under the vibration plate 108 (which is installed within the frame 105), and is also disposed within the space between the upper plate 101 and the wall of the cylinder head 103. As shown in Figures 4A and 4B, the ends of the moving coil 107 are connected to an elastic connector 142 of the terminal part 140 or to a circuit board 143. In this way the vibration plate 108 is vibrated due to the electric current flowing through the 107 voice coil.

In addition, the protective cover 111 is installed in such a way that the fixing step 110 of the protective cover 111 is fixed to the fixing recess 106 of the frame 105. In this way, any intrusion of foreign materials is avoided. Alternatively, the protective cover 111 can be made of a high permeability metal, and in this case, the protective cover 111 is attached to the frame 105 through the caulking portion 160. Meanwhile, Figures 5A, 5B and 5C illustrate the coupled state of another embodiment of the loudspeaker according to the present invention. Figures 6A and 6B illustrate a critical portion showing the installed state of the terminal portion of Figure 5. In this embodiment, the micro-loudspeaker includes a frame 105 and a vibration plate 108 that is installed within the frame 105. The frame 105 which is the main body of the micro loudspeaker accommodates a magnetic circuit 150 which includes an upper plate 101, a magnet 102 and a cylinder head 103. These three elements each have a through hole 112. The magnetic circuit 150 and a terminal part 140 are formed simultaneously when the injection molding of the frame 105 is done. The terminal part 140 includes a terminal part 204 that is disposably installed (to be cut into a notch portion 213) on one side of the cylinder head 103 of the magnetic circuit 150. Under the plate of vibration 108 which is installed within the frame 105, a moving coil 107 is disposed, with its front line extending to the outside of the frame 105. The part bottom edge of the vibration plate 108 is attached to the inner bottom of the frame 105 using an adhesion material DB 109. In addition, a round fixing recess 106 is formed around the outer bottom edge of the frame 105, to fix a stage 1110 of the protective cover 111 made of a plastic material. Alternatively, the protective cover 111 is made of a high permeability metal, and is provided with a caulking portion 160 to be fixed to the fixing recess 106. A contact protrusion 214 is formed under the lower part of the end piece 204 of the end portion 140 applying a caulking or riveting process, to secure a spring 215. This second embodiment of the present invention will now be described in terms of its action and effects. As shown in Figures 5 and 6, the magnetic circuit 150 is formed to generate magnetic fluxes and the terminal portion 140 for supplying an electrical current to the moving coil together with the frame 105 upon application of an injection molding process. Under this condition, the molding resin is injected into the holes of the upper plate 101, the magnet 102 and the cylinder head 103, and to surround the terminal part 140 to make these elements unified. In this way, the plurality of process steps for securing the components of the magnetic circuit 150 and the terminal part 140 are simplified in a single step. In this molding process, the securing protrusion 170 is formed, and the securing protrusion 170 passes through the through holes 112 of the upper plate 101 and the magnet 102. In addition, the securing protrusion 170 has an expanded portion. In addition, the moving coil 107 is disposed under the vibration plate 108 which is attached to the inner lower part of the frame 105. In addition, the moving coil is disposed in the space formed around it. of the cylinder head 103 and the upper plate 101. Furthermore, as shown in Figures 5A, 5B and 5C, the moving coil 107 is connected to the terminal part 140 which is formed in the lower part of the frame 105 in a unified form. If electrical current is supplied through the terminal part 140, then the vibration plate 108 is vibrated due to the interactions between the electrical current of the moving coil 107 and the magnetic fluxes of the magnetic circuit 150., the protective cover 111 which is made of a plastic material is fixed to the frame 105 when fixing the fixing step 110 of the protective cover 111 to the fixing recess 106 of the frame 105. In this way, any foreign material is prevented from entering the frame 105. Alternatively, the protective cover 111 of a metal can be made, and in this case, the protective cover 111 is attached to the frame 105 when fixing a caulking portion (which is formed by perforation or the like) to the fixing recess 106. of the frame 105. In this case, the terminal part 140 is formed in such a way that the lower part of the end piece 204, a contact protrusion 214 is formed by a riveting (formed through cut or perforated). A spring is fixed 215 having a diameter smaller than that of the contact protrusion 214 to the contact protrusion 214. In this way the spring 215 is firmly fixed to the contact protrusion 214 to form an elastic contact of the micro loudspeaker of the present invention. Alternatively, the spring 215 is made to have a diameter equal to that of the contact protrusion 214, and the spring 215 is fixed to the contact protrusion 214. Then the end of the contact protrusion 214 is bent to secure the spring 215 to form an elastic contact of the micro speaker of the present invention. Figure 7 schematically illustrates the manufacturing process for the loudspeaker according to the present invention. Figure 8 is a sectional view showing the manufacturing process for the micro loudspeaker according to the present invention. Figures 9A and 9B are sectional views showing the coupling process of the magnetic circuit of the micro loudspeaker according to the present invention. Figure 10 illustrates schematically the terminal part of the micro loudspeaker according to the present invention. In the present invention, a micro loudspeaker with a size of 15 mm is manufactured including a magnetic circuit 350 which in turn includes a magnet 302 with a diameter of 6.5 mm, a top plate 301 with a diameter of 6.8 mm, and a cylinder head 303 with a diameter of 9.0 mm. The method for manufacturing the micro loudspeaker according to the present invention includes the steps of: setting through holes in a top plate 301, a magnet 302 and a head 303 to form a magnetic circuit 350, the through holes having a same diameter of 1.8-2.2 mm in a magnetic circuit 350, and the magnetic circuit 350 including the upper plate 301, the magnet 302 and the cylinder head 303; forming a terminal part 340 by connecting one end of a moving coil to a terminal part 304, the terminal part 304 that is disposable along a notch portion 313; forming a frame 305 by injecting a molding resin into the through holes of the magnetic circuit 350 and around the cylinder head 303 and the terminal part 340 then installing the terminal part 340 on one side of the cylinder head, to unify the magnetic circuit 350 and the terminal part 340; attaching an inner bottom portion of a vibration plate 308 to an inner bottom portion of the frame 305 using an adhesion material 309 for making ends of the moving coil 307 extended to an outer side of the frame 305 close to the frame 305; connecting the mobile coil 307 by welding one end of the mobile coil 307 to one side of the terminal part 304; and forming a ground terminal 315 (in the form of a spring) to cause the ground terminal 315 to project down from one side of the terminal part of the terminal part 340. This manufacturing method will be described in further detail below. As shown in Figure 7, when the frame 305 is formed, a non-magnetic molding resin is injected and cured, and in this way the magnetic circuit 302 consisting of the top plate 301, the magnet 302 and the cylinder head 303. The upper plate 301, the magnet 302 and the cylinder head 303 have a through hole respectively, and then the magnetic circuit is placed on a mold.

The end piece 304 of the end portion 340 has a notch portion 313, and a side portion is inserted between the notch portion 313 in the frame 305, while the other portion between the notch portion 313 is made to project to the outer part of the frame 305. In order to produce a plurality of the frames 305 and the magnetic circuits 350 by a single process, the plurality of the terminal parts 304 of the terminal parts 340 are connected to a connecting piece 365 and are arranged correspondingly to the magnetic circuits 350. Accordingly, by producing the terminal parts 304 by a single process, a plurality of the terminal pieces 304 are connected to each other via the connecting piece 365. After completion of the formation of the frames 305, the connection piece 365 is cut off to the notch portions 313. After a molding resin is injected into the through holes 312 of the magnetic circuit 350 and around the upper plate 301, the magnet 302 and the cylinder head 303, and around a portion of the terminal part 304 of the terminal part 340. It is injected the molding resin at a pressure of 65-75 Kg / cm2 at a temperature of 220-240 ° C, and cure for 25-45 seconds. In this way, the upper plate 301, the magnet 302 and the cylinder head 303 of the magnetic circuit 350 together with the frame 305 are unified by a single process. In addition, the terminal part 304 is also integrally formed on one side of the frame 305. Under this condition, the diameter of the through holes 312 of the magnetic circuit is 1.8-2.2 mm. The through holes 312 all have the same diameter, so that the molding resin can be gently injected into the through holes 312 of the upper plate 301 (with a diameter of 6.8 mm), the magnet 302 (with a diameter 6.5 mm) and cylinder head 303 (with a diameter of 9. 0 mm). If the through holes 312 have a diameter of less than 1.8 mm, then the injection of the molding resin will be difficult, whereas if the through holes 312 have a diameter of more than 2.2 mm, then the damage often occurs to the magnet 302 due to the injection pressure of the molding resin. If the molding temperature is below 220 ° C, then the melting of the resin is not completed, and therefore, the flow of the molding resin is not so smooth as to increase the load. On the other hand, if the molding temperature is above 240 ° C, although the flow is very smooth, high temperature heat causes damage to the speaker components. Further, if the molding pressure is below 65 Kg / cm2, then the adhesion of the molding resin is not perfect, whereas if the molding pressure is above 75 Kg / cm2, then the magnet 302 is damaged by the Molding resin pressure. As shown in Figure 9A, a groove is made in the upper end of the through hole 312 of the upper plate 301, such that the upper plate 301, the magnet 302 and the yoke 303 can be unifiedly supported. In this way the molding resin that is injected into the through holes does not need to be projected above the top plate 301. Alternatively, the through holes 312 of the magnetic circuit 350 are formed as shown in Figure 9B, and the resin The molding is filled into the through holes 312 also as shown in Figure 9B. In this case, the molding resin partially covers the upper part of the upper plate, and presses the upper plate 301, the magnet 302 and the cylinder head 303, in such a way that the upper plate 301 and the cylinder head 303 can be firmly secured to the head. Also in this case, a plurality of vertical channels 317 are formed in each of the through holes 312 of the upper plate 301, the magnet 302 and the female 303, in such a way that the rotations of the upper plate 301 , the magnet 302 and the cylinder head 302 can be avoided.

When a plurality of the terminal parts 340 is manufactured by a single process, a notch portion 313 is formed in each of the terminal pieces 304 which are integrally connected to a connecting piece 365. After the completion of the molding, they are cut the notch portions 313. Under this condition, the upper part of the cylinder head 303 is made even with the internal stage of the frame 305, while the upper plate 301, the magnet 302 and the cylinder head 303 are secured securely to the frame 305 by the molding resin which is introduced into the through holes 312. Then the moving coil 307 of the vibration plate 308 is inserted into the space formed between the wall of the cylinder head 303 and the upper silver 301 and the magnet 302. The The lower edge portion of the vibration plate 308 is attached to the internal stage of the frame 305 using an adhesion material 309. The mobile coil 307 is then connected to the end piece 304. As shown in Figures 7 and 8, fi the protective cover 311 to the frame 305 using the adhesion material 309. That is, the fixing step 310 of the protective cover 311 is fixed to the fixing recess 306 of the frame 305, whereby the protective cover 311 is fixed to the frame 305. Alternatively, the protective cover 311 of a metal is made, and is fixed to the frame 305 by fixing two or more caulking portions (formed by perforation or the like) to the fixing recess of the frame 305. Furthermore, when the protective cover 311 to the frame 305, the adhesion material 309 is applied both to the upper part of the frame 305 and to the fixing recess 306 of the frame 305. In this way a separate drying process is not required. The contact protrusion 314 of the end piece 304 integrally formed with the frame 305 is formed integrally with the end piece 304 using a rivet which is formed by a caulking or cutting process. A ground terminal 315 in the form of a spring with a smaller diameter is fixed by pressure to the contact protrusion 314, whereby a spring contact of the micro loudspeaker according to the present invention is formed. Alternatively, the spring 315 is made to have a diameter equal to that of the contact protrusion 314, and the spring 315 is fixed to the contact protrusion 314. The end of the contact protrusion 314 is then bent to secure the spring 315 to form a contact spring of the micro speaker of the present invention. In addition, the end piece 304 is provided with one or more of the contact protuberances 344 and one or more of the contact recesses 345. In this way during the molding of the frame 305, the contact protuberances 344 and the recesses of contact 345 in the frame, and therefore, the terminal piece 304 is firmly fixed in the frame 305. Furthermore, as shown in Figure 9, a contact piece is fixed around the magnet 302, such that the magnet 302 can be avoided from being damaged during the injection of the molding resin. The thickness of the contact piece 370 must be such that the external diameter of the contact piece 370 must be smaller than that of the upper plate 301. In this way the injection molding speed is promoted, so that the magnet 302 is prevented from being damaged. According to the present invention, as described above, when the frame is molded, the top plate, the magnet and the cylinder head are unified simultaneously by a single process, so the stages are reduced of manufacturing process. In addition, the coupling of the protective cover to the frame is firm, and a used envelope of the adhesion material is avoided to avoid the occurrence of split resonances. In addition, the protective cover is fixed to the frame in such a way that a separate adhesion material curing process is not required. In addition, the terminal part of the terminal part is integrally formed, and therefore, no separate securing step or curving step is required. In addition, the through holes in the magnetic circuit are formed, and a molding resin is filled in the through holes. Therefore, the respective components of the magnetic circuit are precisely positioned, and therefore, the centered defects of the magnetic circuit are avoided. In addition, the intrusion of the molding resin into the space between the cylinder head wall and the circumferences of the upper plate and the magnet is avoided to avoid the resonance defects. In the foregoing, the present invention is described based on the specific preferred embodiments and drawings, but these should be apparent to those skilled in the art that various changes and modifications may be added without departing from the spirit and scope of the present invention that they are defined in the appended claims.

Claims (28)

1. CLAIMS 1. A micro loudspeaker characterized in that it comprises: an upper plate 101 having a through hole 112 at its center; a magnet 102 installed under the top plate 101, and having a through hole 112 at its center coaxially with the through hole 112 of the top plate 101; a cylinder head 103 having a U-shape for receiving the upper plate 101 and the magnet 102, with a space formed between an inner diameter of the cylinder head 103 and external diameters of the upper plate 101 and the magnet 102 to form a magnetic circuit 150 , and having a through hole 112 at its center coaxially with the through holes 112 of the upper plate 101 and the magnet 102; "a surrounding frame 105 formed around the stock 103, and having a substantially perpendicular bead protrusion 170 projecting upwardly from the bottom of the frame 105 to pass through the through holes 112 and to secure the circuit magnetic 150, a vibration plate 108 with its lower edge portion attached to the inner bottom of the frame 105 when using an adhesion material 109, a moving coil 107 attached to the bottom of the vibration plate 108 and inserted into a head space 103; and a terminal part 140 installed on one side of the frame 105 and connected to the moving coil 107 for supplying external signals to the moving coil 107.
2. 2. The micro loudspeaker according to claim 1, characterized in that the holes in step 112 of the magnetic circuit 150 have the same diameter 3.
3. The micro loudspeaker according to claim 1, characterized in that the frame 105 unified with the magnetic circuit 150 has a terminal locking recess 141 for fixing the terminal part 140.
4. The loudspeaker according to claim 3, characterized in that the terminal part 140 secured to the frame 105 has a terminal locking recess 141 for fixing an elastic connector 142 using an adhesion material 109.
5. 5. The micro loudspeaker according to claim 3, characterized in that the end portion 140 secured to the frame 105 has a terminal attachment recess 141 when fixing a circuit board 143 using an adhesion material.
6. The micro loudspeaker according to claim 1, characterized in that the frame 105 unified with the magnetic circuit 150 has a fixing recess 106 at its lower edge, for fixing a protective cover 111 when fixing a fixing stage 110 of the cover protector 111 in the fixing recess 106.
7. The micro-loudspeaker according to claim 1, characterized in that the frame 105 unified with the magnetic circuit 150 has a fixing recess 106 at its lower edge, for fixing a metal protective cover 111 to the fixing a caulking part 160 of the protective cover 111 in the fixing recess 106.
8. 8. The micro-loudspeaker according to claim 1, characterized in that the magnetic circuit 150 comprises the upper plate 101, the magnet 102 and the cylinder head 103, each of them having the through hole 112, and the terminal part 140 consisting of a conductive terminal part 204 on one side of the basin is formed. 105, the end piece 204 being separated in a notch 213 from a connector piece 265.
9. 9. The compliance loudspeaker according to claim 8, characterized in that the end portion 140 formed in the frame 105 has a contact protrusion 214 in its terminal part 204.
10. The micro loudspeaker according to claim 8, characterized in that the contact protrusion 214 integrally formed in the end piece 204 engages a spring 215 to form a spring contact.
11. A method for manufacturing a loudspeaker, characterized in that it comprises the steps of: forming through holes in a top plate, a magnet and a head to form a magnetic circuit (step orifice formation step); forming a terminal part by connecting one end of a moving coil to a terminal part, the terminal part being separated into a notch part (terminal part forming step); forming a frame by injecting a molding resin into the through holes of the magnetic circuit and to surround the cylinder head and the terminal part after installing the terminal part on one side of the cylinder head, to unify the magnetic circuit and the terminal part (stage frame formation); attaching a lower edge portion of a vibration plate to an inner lower part of the frame using an adhesion material to make the ends of the moving coil extended to an outer side of the frame (vibration plate joining stage); securing a protective cover to an outer side of the frame close to the frame (step of securing a protective cover); connecting the moving coil by welding one end of the moving coil to one side of the terminal part (step d connection of the moving coil); and forming a ground terminal to make the ground terminal project downward from one side d of the terminal part of the terminal part (ground terminal d formation stage).
12. 12. The method according to claim 11, characterized in that in the stage of formation of passage orifice to form the through holes in the magnetic circuit, a groove is made at a higher edge of the through hole of the upper plate.
13. 13. The method according to claim 12, characterized in that the grooving is carried out at an acute angle relative to the through hole of the upper plate.
14. 14. The method according to claim 12, characterized in that in the stage of formation of pitch orifice to form the through holes of the magnetic circuit consisting of the upper plate, the magnet and the cylinder head, the through holes are formed in centers of the upper plate, the magnet and the butt.
15. 15. The method according to claim 11, characterized in that in the step orifice formation step to form the magnetic circuit passage holes consisting of the top plate, the magnet and the cylinder head, the through holes are formed with a diameter of 1.8-2.2 mm.
16. The method according to claim 11, characterized in that in the step of forming a through hole to form the through holes of the magnetic circuit consisting of the upper plate, the magnet and the cylinder head, a plurality of channels are formed vertical around the circumference of the through holes to avoid rotation of the upper plate, the magnet and the cylinder head.
17. The method according to claim 11, characterized in that in the step of forming the terminal part to connect one end of the moving coil to the end piece (the end piece that separates in the notch), a plurality of parts terminals is connected to a connecting piece to be cut along the notches.
18. The method according to any of claims 11 and 17, characterized in that in the step of forming the terminal part to connect one end of the moving coil to the end piece (the terminal piece that is separated in a notch), a portion of the end piece on one side of the notch is unified to the frame, and the other portion of the end piece on another side of the notch is exposed.
19. 19. The method according to claim 11, characterized in that in the step of forming the terminal part to connect one end of the moving coil to the end piece (the terminal piece that separates into a notch), one or more contact projections and one or more recesses in the terminal part.
20. The method according to claim 11, characterized in that the step of forming the terminal part to connect one end of the moving coil to the end piece (the terminal piece that separates into a notch), forms a protrusion of contact in a lower part of the terminal piece through a caulking process.
21. 21. The method according to the claim 11, characterized in that in the step of forming the end portion to connect one end of the moving coil to the end piece (the end piece that is separated in a notch), a contact protrusion is formed on a lower side of the part terminal through the process of drilling or grooving.
22. 22. The method according to claim 11, characterized in that in the step of forming the frame to form the frame by unifying the terminal part and the magnetic circuit by injecting a molding resin into the through holes of the magnetic circuit and to external sides of the magnetic circuit. the cylinder head and the terminal part after forming the terminal part on one side of the cylinder head, the molding resin injected in this manner covers a portion of an upper part of the upper plate.
23. 23. The method according to claim 11, characterized in that in the step of forming the frame to form the frame by unifying the terminal part and the magnetic circuit by injecting a molding resin into the through holes of the magnetic circuit and to external sides of the cylinder head and the terminal part after forming the terminal part on one side of the cylinder head, a non-magnetic molding resin is injected at a pressure of 65-75 Kg / cm2.
24. 24. The method of compliance with the claim 11, characterized in that in the step of forming the frame to form the frame by unifying the terminal part and the magnetic circuit by injecting a molding resin into the through holes of the magnetic circuit and to external sides of the head and the end part after forming the terminal part on one side of the cylinder head, a contact piece is fixed around the magnet.
25. 25. The method according to claim 11, characterized in that the contact piece fixed around the magnet has a smaller external diameter than the upper plate.
26. 26. The method according to claim 11, characterized in that in the step of securing the protective cover, a fixing recess is formed around a lower edge of the frame, to receive a protective metal cover through the caulking, the Caulking that is formed by a perforation process.
27. 27. The method according to claim 11, characterized in that in the stage of ground terminal formation, a contact protrusion (formed by a caulking process) is formed to be attached to a spring. The method according to claim 11, characterized in that in the step of forming the ground terminal, a contact protrusion (formed by a rivet forming process) is formed to be fixed to a spring and to fix by Curved the spring.