JP4354350B2 - Small speaker and method for manufacturing the same - Google Patents

Description

  The present invention relates to a speaker used in various audio equipment and a method for manufacturing the same.

  For small speakers used in mobile communication devices such as mobile phones, market demands for further miniaturization, higher sound pressure, higher input resistance, and higher productivity are becoming more and more noticeable year by year. Under such market requirements, we have developed a new structure for the speaker structure of small speakers used in these electronic devices, and the manufacturing method of this new structure speaker. It is necessary to establish it.

  The conventional method for manufacturing this type of speaker is based on the manufacturing process diagram shown in FIG. Further, sectional views of the speaker in each step are shown in FIGS. 7 and 8, and a finished product of the speaker is shown in FIG.

  A conventional speaker of this type is mainly of a type in which a diaphragm and an edge are integrated to form a single sheet. Therefore, this type of speaker manufacturing method has been manufactured by a manufacturing process as shown in FIG.

  First, when the frame 6 was injection-molded with a resin material, the yoke 3 was also molded while being inserted together (a). At this time, the inner periphery of the rim portion of the frame 6 and the inner periphery of the yoke 3 are dimensionally controlled, and positioned in a concentric manner without being eccentric, and injection molded.

  Next, in the magnetic circuit assembling process, the magnet 1 and the upper plate 2 are bonded to the yoke 3 integrated with the frame 6 (b). At this time, in order to accurately configure the size of the magnetic gap 5 constituted by the yoke 3 and the upper plate 2, the gaps were joined by adhesion using a gap gauge (c).

  Next, the voice coil 8 was bonded to the diaphragm 7 composed of a single sheet, in which the diaphragm and the edge were integrated, without being decentered (d). With respect to the method of adhesive bonding without eccentricity, the diaphragm portion and the edge portion of the diaphragm 7 are formed in a concentric shape with high accuracy, and the outer shape of the vibration plate is also drawn out in a concentric shape with high accuracy. It was necessary.

  The voice coil 8 is bonded to the boundary between the diaphragm portion and the edge portion of the diaphragm 7 by bonding without being eccentric with the outer shape of the diaphragm 7. As this method, a manufacturing method using a method in which the inner diameter of the voice coil 8 and the outer shape of the diaphragm 7 are dimensionally regulated with a jig and is bonded and bonded with high accuracy without being eccentric.

  Next, an assembled product in which the outer shape of the diaphragm 7 and the inner diameter of the voice coil 8 are adhesively bonded with high precision without being eccentric is attached to the frame 6 while the outer shape of the diaphragm 7 is regulated by the inner diameter of the edge portion of the frame 6. (E).

  By adopting the above manufacturing method, a speaker configuration as shown in FIG. 9 in which the voice coil 8 is fitted into the magnetic gap 5 without being eccentric can be obtained.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2002-152895 A

  In the above-described speaker configuration, it is preferable to use the above-described speaker manufacturing method from the viewpoint of improving accuracy and productivity.

  However, in order to satisfy the above market demand, the above speaker configuration has already reached its limit. Therefore, it is necessary to develop a new speaker structure and establish a method for manufacturing the new speaker structure.

  Therefore, for the development of a new speaker structure, the outer diameter of the speaker is reduced while maintaining a large voice coil, large magnet, and large edge width in order to achieve further miniaturization, higher sound pressure, and higher input resistance. It is configured to do. In this configuration, the diaphragm is divided into a central part having a function of a diaphragm and an edge of an outer peripheral part that secures vertical amplitude, and has a two-body structure.

  By adopting this configuration, the crossover portion can be removed from the outside diameter of the speaker by providing a crossover portion and adhesively bonding the center portion having the function of the diaphragm and the edge of the outer peripheral portion ensuring the vertical amplitude. Can be small. Therefore, it is possible to secure a large voice coil, a large magnet, and a large edge width while satisfying the miniaturization of the speaker, and to realize high sound pressure and high input resistance.

  However, manufacturing a speaker that can secure mass productivity of a speaker having a two-piece configuration in which the diaphragm of a small speaker is divided into a central part having a function of a diaphragm and an edge of an outer peripheral part that ensures vertical amplitude in this way. The method has the problem that it does not exist.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object of the present invention is to provide an excellent speaker manufacturing method capable of securing mass productivity of a small speaker having a two-piece diaphragm.

In order to solve the above problems, the present invention includes a step of positioning a bonded product of a diaphragm and a voice coil and a frame with a positioning jig inserted from the back, and fixing the diaphragm and the frame with an edge. Aligning the combined product and the frame with the above, and extracting the positioning jig inserted from the back, and exchanging the magnetic circuit assembled in a separate process with the extracted positioning jig insert coupling for Bei a step Ete, a central portion having the function of the diaphragm, is divided into an outer peripheral portion of the edge to secure the upper and lower amplitude to a two-body structure, by adhesive bonding by providing crossover portion, treble This is a method for manufacturing a small speaker that ensures high pressure, high input resistance, and high precision mass productivity .

  With this manufacturing method, it is possible to secure mass productivity of a speaker that is a two-body diaphragm divided into a central part having a diaphragm function and an edge of an outer peripheral part that secures vertical amplitude.

In the manufacturing method of the speaker of the present invention, it is divided into a central part having a function of a diaphragm and an edge of an outer peripheral part to ensure vertical amplitude, and a crossover part is provided and adhesively bonded. This is a manufacturing method that can ensure the mass productivity of a two-body diaphragm. With this manufacturing method, a two-body vibration that can secure a large voice coil, a large magnet, a large edge width, and achieve high sound pressure and high input resistance while satisfying the miniaturization of the speaker. It is possible to establish a stable manufacturing method with high accuracy of a plate-type small speaker.

  As described above, the present invention can provide an excellent speaker manufacturing method capable of achieving both a reduction in size of a speaker, high sound pressure, and high input resistance, and its industrial value is very large. is there.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
Hereinafter, the first and second aspects of the present invention will be described with reference to the first embodiment.

  FIG. 1 is a manufacturing process diagram showing a method for manufacturing a small speaker having a two-body diaphragm according to an embodiment of the present invention. In addition, cross-sectional views of the speaker in each process are shown in FIGS. 2 to 4, and a completed speaker is shown in FIG. 5.

  1 to 5 will be described. First, the magnet 21 and the upper plate 22 are bonded to the yoke 23 by bonding (a). At this time, in order to accurately configure the size of the magnetic gap 25 composed of the yoke 23 and the upper plate 22, it is adhesively bonded using a gap gauge to assemble the magnetic circuit 24 (b).

  Next, a voice coil 28 is coupled to a diaphragm 27 obtained by press-molding PEN, which is a resin sheet material, to form a coupled product of the diaphragm and the voice coil (c). Further, a frame 26 made of a resin material is obtained by injection molding (d).

  Then, the combined product of the diaphragm 27 and the voice coil 28 and the frame 26 are positioned by inserting a jig from the back (e). Here, the positioning jig regulates positioning of at least the inner diameter of the diaphragm 27 or a combined product of the diaphragm 27 and the voice coil 28 and the inner diameter of the frame 26. When a part of the diaphragm 27 is a bobbin of the voice coil 28, the inner diameter of the diaphragm 27 is restricted, and when the part is not a bobbin, the inner diameter of the voice coil 28 is regulated. By adopting this configuration, the diaphragm inner diameter and voice coil inner diameter, which are originally finished with high accuracy, together with the inner diameter of the frame 26 are used as a support for positioning regulation, so that an adhesive bond with less eccentricity and high accuracy can be obtained. Can do.

Next, the positioned diaphragm 27 and voice coil 28 combined with the diaphragm 27 and the frame 26 are bonded and bonded by an edge 29 with a crossover portion (f). In this way, by bonding with the edge 29, the outer diameter of the edge 29 and the inner diameter of the voice coil 28 can be bonded and bonded with high accuracy without being eccentrically concentrically, and this state can be maintained.

  Next, the positioning jig inserted from the back is removed (g). Then, in place of the extracted positioning jig, the magnetic circuit 24 assembled in the previous step is inserted and coupled (h).

  As described above, the finished product of the speaker shown in FIG. 5 can be obtained. Further, if necessary, a protector may be provided so as to cover the diaphragm 27.

  By using the above manufacturing method, it is possible to manufacture a speaker that can ensure a large voice coil, a large magnet, and a large edge width while satisfying the downsizing of the speaker.

  As described above, a speaker manufacturing method that can secure mass productivity of a speaker having a two-piece configuration in which a diaphragm of a small speaker is divided into a central part having a function of a diaphragm and an edge of an outer peripheral part for ensuring vertical amplitude. Can be realized. Therefore, the manufacture of a two-body diaphragm type small speaker capable of realizing high sound pressure and high input resistance can be established as a highly accurate and stable manufacturing method with high productivity.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the second embodiment.

  The drawings will be described with reference to FIG. 5 used in the first embodiment. The invention according to claim 3 of the present invention is a speaker manufactured by the speaker manufacturing method described in the first embodiment.

  In other words, the speaker is manufactured by a manufacturing method of a small speaker having a two-body diaphragm including a diaphragm coupled with a voice coil and an edge. As shown in FIG. 5, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to constitute an internal magnet type magnetic circuit 24. A frame 26 is coupled to the yoke 23 of the magnetic circuit 24. The outer periphery of the edge 29 is bonded to the peripheral portion of the frame 26, and the inner periphery of the edge 29 is coupled to the diaphragm 27. A voice coil 28 is coupled to the outer periphery of the diaphragm 27, and the voice coil 28 is configured to fit into the magnetic gap 25 of the magnetic circuit 24.

  Here, the coupling portion of the edge 29 with the diaphragm 27 is provided on the inner circumference side of the coupling position of the voice coil 28 on the outer circumference of the diaphragm 27, and has a crossover portion between the diaphragm 27 and the edge 29. It is a thing. The crossover portion is configured so as to ensure the crossover portion even if the bonding portion of the edge 29 to the diaphragm 27 is removed.

  With this configuration, by providing the crossover portion between the diaphragm 27 and the edge 29 excluding the portion where the edge 29 is bonded to the diaphragm 27, the outer dimensions of the coupling portion between the diaphragm 27 and the voice coil 28 are reduced. Without having to make the magnet 21 small. Further, the speaker can be reduced in size without reducing the size of the edge 29. That is, by providing a crossover portion between the diaphragm 27 and the edge 29, it is possible to reduce the speaker external dimensions that are the same as the crossover portion.

  With the above configuration, even if the speaker is reduced in size, it is not necessary to reduce the size of the magnet 21 and a decrease in the sound pressure level of the speaker can be eliminated. Further, it is not necessary to reduce the size of the edge 29, the amplitude stroke of the vibration system can be secured, and the deterioration of the input resistance characteristic of the speaker can be eliminated. Therefore, it is possible to reduce the size of the speaker while ensuring the sound pressure level and input resistance characteristics of the speaker.

  According to the speaker manufacturing method of the present invention, the diaphragm of a small speaker is divided into a central part having the function of a diaphragm and an edge of an outer peripheral part to ensure vertical amplitude. The present invention can be applied to a method for manufacturing a speaker used for various audio equipment to be secured.

Manufacturing process diagram of speaker in one embodiment of the present invention Sectional drawing which shows each manufacturing process of the speaker in one embodiment of this invention Sectional drawing which shows each manufacturing process of the speaker in one embodiment of this invention Sectional drawing which shows each manufacturing process of the speaker in one embodiment of this invention Sectional drawing of the speaker manufactured by the manufacturing method of the speaker in one embodiment of this invention Manufacturing process diagram of conventional speaker Sectional drawing which shows each manufacturing process of the conventional speaker Sectional drawing which shows each manufacturing process of the conventional speaker Sectional view of a speaker manufactured by a conventional speaker manufacturing method

Explanation of symbols

21 Magnet 22 Upper plate 23 Yoke 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 Diaphragm 28 Voice coil 29 Edge

Claims (3)

A method of manufacturing a speaker in which a diaphragm and an edge are configured separately, wherein a combination of a diaphragm and a voice coil and a frame are positioned by a positioning jig inserted from the back, The bonded product diaphragm and the frame are fixed to each other by an edge, and the bonded product and the frame are positioned and joined, and the positioning jig inserted from the back surface is removed, and in a separate process. and a step of coupling by inserting in exchange for the sampling has been positioning jigs magnetic circuit assembled Te Bei Ete, a central portion having the function of the diaphragm, the edge of the outer peripheral portion to secure the upper and lower amplitude A small speaker manufacturing method that ensures high sound pressure, high input resistance, and high-accuracy mass-productivity by forming a two-body structure and adhesively bonding with a crossover portion . 2. The method for manufacturing a small speaker according to claim 1, wherein the positioning jig regulates positioning of an inner diameter of a combined product of the diaphragm and the voice coil and an inner diameter of the frame. Claim 1 or small speaker manufactured by the manufacturing method of a small speaker of claim 2, wherein.

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