JP4416003B2 - Speaker manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a thin type speaker.

  Since electronic devices such as portable devices are required to be thin, a speaker built in the main body is also required to be thin.

In order to reduce the thickness of the speaker, it is natural to reduce the size of the magnet for forming the magnetic circuit. However, if the magnet is made smaller, the magnetic force becomes smaller, and as a result, audio output is also reduced. Since it becomes small, the magnet cannot actually be made very small (for example, such a conventional technique is described in Patent Document 1 below).
JP 2005-51283 A

  In order to solve such a problem of miniaturization of magnets, it has been studied to try to cope with miniaturization by dividing the magnets and arranging them in an optimal place.

  However, when trying to arrange a plurality of magnetized magnets, it is difficult to properly arrange the plurality of magnets in a predetermined portion due to the attractive force or repulsive force of the plurality of magnets, and the productivity is poor. Become.

  Therefore, the present invention aims to increase productivity.

  In order to achieve this object, the present invention provides first and second plate magnets arranged in a horizontal direction at a predetermined interval on one surface of the first plate, and the first and second plate shapes. A third plate magnet arranged with a magnetic gap formed between the magnets and the inner ends of the first and second plate magnets, a voice coil arranged in the magnetic gap, and this voice A diaphragm coupled to a coil, wherein the first and second plate magnets have magnetic poles at least at their inner ends, and the third plate magnet has magnetic poles at both ends in the plate thickness direction. The third plate-shaped magnet is arranged on the second plate after magnetization, and then the second plate and the first plate are opposed to each other. By bringing them closer, the third gap is formed with a magnetic gap formed between the inner ends of the first and second plate magnets. It is to place the Jo magnets.

  As described above, in the present invention, the third plate-shaped magnet is disposed on the second plate body after magnetization, and then the second plate body and the first plate body are brought close to each other in an opposing state, The third plate magnet is arranged with a magnetic gap formed between the inner ends of the first and second plate magnets.

  That is, since the third plate magnet is magnetized, if it is arranged between the first and second plate magnets, the magnetic attractive force with the first and second plate magnets, or Due to the repulsive force, as a result, it is very difficult to arrange the third plate magnet in a predetermined portion between the first and second plate magnets, resulting in low productivity.

  Therefore, in the present invention, as described above, the third plate magnet is disposed on the entire surface of the second plate after magnetization, and then the second plate and the first plate are brought close to each other in an opposing state. The third plate-like magnet is arranged in a state where a magnetic gap is formed between the inner ends of the first and second plate-like magnets. According to this, the third plate-like magnet is arranged. Since the magnet is arranged on the entire surface of the second plate, even if it receives a magnetic attractive force or a repulsive force with the first and second plate magnets, it can be easily arranged at a predetermined portion. , Become productive.

  Hereinafter, an embodiment of the present invention will be described using a mobile phone as an example of an electronic device with reference to the accompanying drawings.

  In FIG. 1, reference numeral 1 denotes a main body, and a lid 2 is coupled to the main body 1 so as to be freely opened and closed. When viewed from the back side in FIG. 1, the main body 1 is provided with an operation button (not shown) like a general mobile phone, and the lid 2 has a liquid crystal display (not shown). Is provided.

  Further, two covers 3 are provided on the outer surface side of the main body 1 as shown in FIG. 1, and the speaker 4 shown in FIGS. 2 to 4 is mounted in the main body 1 on the back side of these covers 3. .

  As shown in FIGS. 2 to 4, the speaker 4 is formed of a surface-side plate (first plate) 5 formed of stainless steel 301 that is a non-magnetic material and a cold-rolled steel plate that is a magnetic material. Between the plate (second plate) 6 and the plate 6 side toward the plate 5, a neodymium plate magnet 7, a diaphragm 8 formed of a PEI resin film, a copper wire, etc. A voice coil 9, a ring 10 formed of a cold-rolled steel plate, which is a magnetic material, and two plate magnets 11 and 12 made of neodymium are sequentially arranged.

  A part of the surface of the plate 5 and the outer peripheral side of each part are covered with a resin frame 13 as shown in FIGS.

  As shown in FIGS. 2 to 4, the plate 6 has an oval shape, and a rectangular plate-like magnet 7 is attached to an adhesive (7 a in FIG. 5) on the rectangular fixing portion 6 </ b> A in the longitudinal central axis portion. ) And rectangular openings 6B are formed on both sides of the fixed portion 6A.

  Further, the outer periphery of the diaphragm 8 is placed on the outer periphery of the plate 6, and the ring 10 is placed on the outer periphery of the diaphragm 8.

  Further, at the portion of the upper surface of the diaphragm 8 facing the opening 6B of the plate 6, the two plate magnets 11 and 12 are bonded and fixed to the lower surface of the plate 5 with an adhesive (5b in FIG. 5). Has been.

  In addition, the part between the plate-shaped magnets 11 and 12 installation part of the plate 5 becomes the sound emission opening part 5a, and this sound emission opening part 5a is covered with the cover 3 as mentioned above.

  An oval voice coil 9 is fixed to the upper surface of the diaphragm 8 at a portion corresponding to the outer periphery of the plate magnet 7.

  In the state constructed as described above, the two plate magnets 11 and 12 made of neodymium are magnetized with the N-pole on the inner end side in the longitudinal direction and the S-pole on the outer end side as shown in FIG. ing.

  Further, as shown in FIG. 5, the neodymium plate-like magnet 7 is magnetized such that the surface side in the thickness direction is an S pole and the lower surface side in the thickness direction is an N pole.

  As a result, as shown in FIGS. 2 and 5, the magnetic flux emitted from the N pole inside each of the two plate magnets 11 and 12 made of neodymium (in FIG. 5, one plate is used in order to avoid the complexity of the drawing. (Only the magnetic flux from the magnet 11 is shown) travels inward substantially horizontally, crosses the voice coil 9 in a substantially orthogonal state, and then enters the south pole on the upper surface of the plate magnet 7 ( The plate-like magnets 11 and 12 and the plate-like magnet 7 are described as being arranged in a horizontal or substantially horizontal state. However, the substantially horizontal state means the plate-like magnets 11 and 12 and the plate-like magnet 7. 5 includes a state in which the thickness direction partially overlaps in the horizontal direction, or a state in which the both do not overlap in the thickness direction but partially overlap in the horizontal direction as shown in FIG. It is important to move the voice coil 9 so as to be substantially perpendicular to the voice coil 9. The state in which a slight width is set.).

  Thereafter, the magnetic flux emitted from the N pole on the lower surface of the plate magnet 7 travels through the rectangular fixed portion 6A of the plate 6 as shown in FIG. Next, after this ring 10 advances, for example, by a quarter turn, it enters the outer peripheral south pole of the plate magnets 11 and 12 fixed to the inner periphery of the ring 10 as shown in FIG. Become.

  The magnetic flux flows as it is to form a magnetic circuit. In this magnetic circuit, the gap between the inner N poles of the plate magnets 11 and 12 and the upper surface S pole of the plate magnet 7 forms a magnetic gap. Is given an electromagnetic field driving force, whereby vibration is transmitted to the diaphragm 8 to which the voice coil 9 is fixed, and sound output is generated. Then, the sound is emitted from the sound emission opening 5a to the outside of the main body 1 in FIG.

  Here, the progression of the magnetic flux in the magnetic gap will be described again.

  As shown in FIG. 5, the magnetic flux emitted from the N pole inside each of the plate magnets 11 and 12 shown in FIGS. 2 and 5 travels substantially inward in the magnetic gap, and substantially passes through the voice coil 9. Crossing in an orthogonal state is very important for increasing the electromagnetic field driving force, and is a significant feature in the present embodiment.

  In the present embodiment, the reason why the magnetic flux travels substantially inward in the magnetic gap and crosses the voice coil 9 in a substantially orthogonal state will be considered.

  Generally speaking, the magnetic flux emitted from the N pole of the plate magnets 11 and 12 tends to travel obliquely to the S pole on the upper surface of the plate magnet 7 that is short in distance (in this case, the magnetic flux is a voice coil). 9), the magnetic flux is actually lifted by the repulsive force by receiving the repulsion of the N pole on the lower surface of the plate magnet 7, and as a result, in the present embodiment, It is considered that the magnetic flux travels substantially inward in the magnetic gap and crosses the voice coil 9 in a substantially orthogonal state.

  In the present embodiment, since the plate magnets 11 and 12 and the plate magnet 7 are provided on both sides of the magnetic gap as described above, the so-called magnetic force is increased, and as a result, the sound output by the diaphragm 8 is also large. It can be.

  Further, since the plate-like magnets 11, 12, and 7 for increasing the magnetic force are literally plate-like and thin themselves, as a result, the overall shape can be made very thin.

  Next, a manufacturing method for the constituent parts of the plate magnets 11, 12, and 7 in the present embodiment will be described.

  First, as shown in FIG. 6, the plate-like magnets 11 and 12 invert the plate 5, and in that state, are bonded and fixed to the upper surface (the lower surface side in the state of FIG. 5 before inversion) with an adhesive (5b in FIG. 5).

  At this time, since the plate magnets 11 and 12 are not yet magnetized, no magnetic attractive force or repulsive force is generated when the plate magnets 11 and 12 are installed on the plate 5. The plate-like magnets 11 and 12 can be easily arranged and fixed to the plate 5 by an adhesive (5b in FIG. 5).

  Furthermore, since the plate-like magnets 11 and 12 are not magnetized, the magnetic material is not attracted inadvertently during storage, and management is easy. Furthermore, if the plate magnets 11 and 12 are not magnetized in this way, they can be arranged on the plate 5 without worrying about their polarities, and this also provides good productivity.

  Next, an integrated product of the plate 5, the ring 10, the plate magnets 11, 12 and the frame 13 shown in FIG. 6 is installed in the magnetizing device 14 shown in FIGS. 7 and 8. The end side is magnetized to the N pole and the outer end side is magnetized to the S pole.

  In the magnetizing device 14, three magnetizing yokes 16, 17 and 18 are arranged upright at a predetermined interval in a case 15.

  The three magnetizing yokes 16, 17, and 18 are wound with coils 16a, 17a, and 18a, but the coil 16a and the coils 17a and 18a are wound in the opposite direction so that the coil 16a When energizing the coils 17a and 18a, the upper part of the magnetizing yoke 16 is magnetized to the N pole, and the upper part of the magnetizing yokes 17 and 18 is magnetized to the S pole.

  The magnetization yokes 16, 17, 18, the coil 16 a, and the coils 17 a, 18 a are covered with the resin body 19 in the case 15, but only the upper part of the magnetization yokes 16, 17, 18 is on the resin body 19. Protruding.

  A holder 20 is set on the upper surface of the case 15 above the case 15.

  The holder 20 has a square planar shape as shown in FIG. 8, and as shown in FIG. 8, the opening 21 into which the upper end portions of the magnetizing yokes 16, 17, 18 enter in the X direction. Is provided.

  A mounting table 22 is provided in the Y direction orthogonal to the opening 21, and the plate 5, the ring 10, the plate magnets 11 and 12, and the frame 13 shown in FIG. 6 are integrated on the mounting table 22. Both ends in the longitudinal direction are installed as shown in FIG.

  In this state, as shown in FIG. 9, the upper end of the magnetizing yoke 16 enters from the sound emitting opening 5 a of the plate 5 shown in FIGS. 2 and 6 and approaches or contacts the inside of the plate magnets 11 and 12. In addition, the magnetizing yokes 17 and 18 are close to the outside of the plate magnets 11 and 12 outside the frame 13.

  In the state of FIG. 9, when a magnetizing current is passed through the coil 16a and the coils 17a and 18a, the upper part of the magnetizing yoke 16 is magnetized to the N pole and the upper part of the magnetizing yokes 17 and 18 is magnetized to the S pole as described above. Thus, the inside of the plate magnets 11 and 12 is magnetized to the N pole and the outside is magnetized to the S pole.

  At this time, since the plate magnets 11 and 12 are bonded and fixed to the plate 5 with an adhesive (5b in FIG. 5) as described above, even if both the inner portions of the plate magnets 11 and 12 become N poles, It will not peel off from the plate 5 due to the repulsive force.

  Next, the assembly of the plate 5, the ring 10, the plate magnets 11 and 12 and the frame 13, the vibration plate 8 and the plate 6 will be described.

  Prior to this assembly, a voice coil 9 is integrated with the diaphragm 8, and a rectangular plate-like magnet 7 is attached to the plate 6 with a rectangular fixing portion 6A by an adhesive (7a in FIG. 5). It is fixed and integrated.

  First, in this state, as shown in FIG. 10, the integrated product of the plate 5, the ring 10, the plate magnets 11 and 12, and the frame 13 is placed on the base 23 with the plate 5 side facing down.

  The base 23 is made of a magnetic material such as iron, and a protrusion 23 a that protrudes into the sound emission opening 5 a of the plate 5 is integrally formed on the upper surface of the base 23.

  Next, the diaphragm 8 is installed on the ring 10, and then the lower end of the assembly jig 24 is placed on the frame 13 as shown in FIG.

  In the assembly jig 24, a movable body 25 formed of a magnetic material such as iron is disposed so as to be movable up and down. A concave portion corresponding to the plate magnet 7 is provided at the lower end of the movable body 25. 25a is formed.

  At the lower end of the movable body 25, the plate 6 is arranged with the plate magnet 7 on the lower side. Before the plate magnet 7 is bonded and fixed to the lower surface of the plate 6 with an adhesive (7a in FIG. 5), as shown in FIG. 5, the plate 6 side is magnetized with an N pole and the opposite side is magnetized with an S pole. Therefore, the plate 6 is attracted to the lower end of the movable body 25 as shown in FIG.

  Next, when the movable body 25 is lowered from the state of FIG. 10, the plate 6 is separated from the lower end of the movable body 25 just before the lower surface of the plate 6 comes into contact with the upper surface of the diaphragm 8, and as shown in FIG. Move to the top side of the.

  This is because the magnetic attractive force by the plate magnet 7 is stronger on the protrusion 23a side of the base body 23 than on the movable body 25 side.

  That is, in order to move the plate 6 due to such a difference in magnetic attraction force, the base 23 is formed with a protrusion 23a and the movable body 25 is formed with a recess 25a (for example, the recess 25a of the movable body 25). By making the volume of the protrusion 23a larger than the volume of the protrusion 23a, as described above, the magnetic attractive force by the plate magnet 7 is stronger on the protrusion 23a side of the base body 23 than on the movable body 25 side. did.).

  Further, when the plate 6 is lowered in this way, the plate magnet 7 having the N pole on the plate 6 side and the S pole on the opposite side has plate magnets 11 and 12 whose inner sides are N poles. However, such a displacement does not occur due to the restraint in the horizontal direction by the inner surface (constraint wall surface) of the assembly jig 24, and finally the force is exerted on the plate magnet 11 or 12 side. Are arranged at appropriate positions as shown in FIG.

  Then, with the plate 6 moving away from the lower end of the movable body 25 and moving to the upper surface side of the diaphragm 8 as shown in FIG. 11, the assembly jig 24 and the movable body 25 are raised, and then the plate 6 is moved. Bonding and fixing to the frame 13 with an adhesive 26 completes the assembly.

  As described above, the present invention provides the first and second plate magnets arranged in the horizontal direction at a predetermined interval on one surface of the first plate body, and between the first and second plate magnets. A third plate magnet disposed with a magnetic gap formed between the inner ends of the first and second plate magnets, a voice coil disposed in the magnetic gap, and a voice coil coupled thereto A speaker having a configuration in which the first and second plate magnets have magnetic poles at least at their inner ends, and the third plate magnet has magnetic poles at both ends in the plate thickness direction. The third plate magnet is disposed on one surface of the second plate after magnetization, and then the second plate and the first plate are brought close to each other in a facing state. The third plate magnet is disposed in a state where a magnetic gap is formed between the inner ends of the first and second plate magnets. Than is.

  That is, since the third plate magnet is magnetized, if it is arranged between the first and second plate magnets, the magnetic attractive force with the first and second plate magnets, Alternatively, as a result of receiving the repulsive force, it is very difficult to dispose the third plate magnet at a predetermined portion between the first and second plate magnets, resulting in low productivity.

  Therefore, in the present invention, as described above, the third plate magnet is disposed on the entire surface of the second plate after magnetization, and then the second plate and the first plate are brought close to each other in an opposing state. The third plate-like magnet is arranged in a state where a magnetic gap is formed between the inner ends of the first and second plate-like magnets. According to this, the third plate-like magnet is arranged. Since the magnet is arranged on the entire surface of the second plate, even if it receives a magnetic attractive force or a repulsive force with the first and second plate magnets, it can be easily arranged at a predetermined portion. , Become productive.

  As a result, a thin speaker can be easily obtained, which is very easy to use for a portable device such as a cellular phone.

The perspective view which applied one embodiment of the present invention to a cellular phone 1 is an exploded perspective view of a speaker according to an embodiment of the present invention. Cross-sectional view of the speaker in the long side direction Cross section of the speaker in the short side direction Enlarged sectional view of the speaker Cross-sectional view of the speaker plate Sectional view of the speaker manufacturing equipment Plan view of the speaker manufacturing equipment Sectional view of the speaker manufacturing equipment Sectional view of the speaker manufacturing equipment Sectional view of the speaker manufacturing equipment

Explanation of symbols

5 plate (first plate)
5a Sound emission opening 6 Plate (second plate)
7 Plate-shaped magnet 8 Diaphragm 9 Voice coil 11, 12 Plate-shaped magnet 13 Frame 14 Magnetizing device 15 Case 16, 17, 18 Magnetized yoke 19 Resin body 20 Holder 21 Opening 22 Mounting base 23 Base 23 a Projection 24 Assembly jig 25 Movable body 25a recess

Claims (9)

A first plate and a second plate magnet arranged in a horizontal direction at a predetermined interval on one surface of the first plate body, and a first plate and a second plate between the first plate magnet and the second plate magnet, respectively. A third plate magnet disposed in a state where a magnetic gap is formed between the inner end of the magnet and a voice coil disposed in the magnetic gap, and a diaphragm coupled to the voice coil. The first and second plate magnets have a magnetic pole at least at the inner end thereof, and the third plate magnet is a method of manufacturing a speaker having a magnetic pole at both ends in the plate thickness direction, The third plate magnet is disposed on the second plate body after magnetization, and then the first and second plates are brought close to each other by bringing the second plate body and the first plate body close to each other. A speaker manufacturing method in which a third plate magnet is disposed in a state where a magnetic gap is formed between the inner end of the magnet. The first plate body has a sound emission opening in a portion between the first and second plate magnet installation portions, and the diaphragm is exposed to the sound emission opening, and the first plate of the vibration plate is arranged. The method for manufacturing a speaker according to claim 1, wherein a third plate-like magnet is arranged on the side opposite to the second plate-like magnet. The method for manufacturing a speaker according to claim 1 or 2, wherein the first, second, and third plate-shaped magnets are each rectangular, and the first to third plate-shaped magnets are opposed to the long sides. . 4. The method of manufacturing a speaker according to claim 3, wherein the voice coil has a substantially elliptical planar shape, and long sides on both sides of the substantially elliptical voice coil are arranged in a magnetic gap. The opposing side end of the first and second plate magnets is an N pole, and the side surfaces of the first and second plate magnets of the third plate magnet are S poles. The manufacturing method of the speaker as described in one. The speaker manufacturing method according to claim 1, wherein the first and second plate magnets are magnetized after being fixed to the first plate body. A first plate body is provided on the upper surface of the base body having a protrusion on the upper surface. The first plate body has first and second plate magnets on the upper surface side, and the protrusion of the base body enters the sound emitting opening. The second plate is held by the lower surface of the movable body in the assembly jig arranged above the upper surface of the base body with the third plate-shaped magnet on the lower surface side, and then the movable body is lowered. The speaker manufacturing method according to any one of claims 2 to 6, wherein the third plate magnet is disposed between the first and second plate magnets. The speaker manufacturing method according to claim 7, wherein a constraining wall surface that constrains movement of the second plate in the horizontal direction is provided on an inner surface of the assembly jig. The speaker manufacturing method according to claim 7 or 8, wherein a concave portion is provided on the lower surface of the movable body.

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