JP2010154443A - Magnetic circuit for loudspeaker, loudspeaker device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic circuit for a loudspeaker, which can house a loudspeaker device in a specified space that portable electronic equipment such as a cellular phone has when the magnetic circuit for the loudspeaker is packaged in the portable electronic equipment. <P>SOLUTION: The magnetic circuit 1 for a loudspeaker includes at least an inner magnet 12, a yoke 11 and a fixing member 16. In the magnetic circuit 1 for the loudspeaker, the fixing member 16 is engaged with the yoke 11 in a state in which the inner magnet 12 is housed, so that the inner magnet 12 is fixed to the yoke 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention has a magnetic circuit for a speaker suitable for use in a small speaker device mounted on a portable electronic device such as a mobile phone, a portable radio, or a PDA (Personal Digital Assistants), and the magnetic circuit for a speaker. The present invention relates to a speaker device and an electronic device including the speaker device.

  2. Description of the Related Art Conventional speaker devices include one in which a magnetic circuit unit including a diaphragm having a voice coil fixed thereto, a yoke, a magnet fixed to the yoke, and a top plate fixed to the magnet is fixed to a frame. In this speaker device, a through hole is provided in the central portion of the yoke, magnet, and top plate, and a support shaft standing upright from the frame is inserted into the through hole, and the head of the support shaft is caulked (for example, Patent Documents). 1).

JP 2003-289596 A (claim 1, [0011], [0014] to [0017], FIGS. 1 to 3)

In the conventional speaker device described above, since the bottom of the frame needs to be disposed below the bottom of the yoke, the thickness of the speaker device becomes relatively large, and the prescribed electronic device such as a mobile phone has It becomes difficult to accommodate the speaker device in the space.
The present invention has been made in view of the above-described circumstances, and an example of an object is to solve the above-described problems, and a speaker magnetic circuit and a speaker that can solve these problems An object is to provide an apparatus and an electronic device.

  In order to solve the above-described problem, a magnetic circuit for a speaker according to the invention of claim 1 includes at least a magnet, a yoke, and a fixing member, and the yoke includes the yoke in a state where the fixing member accommodates the magnet. By engaging with the magnet, the magnet is fixed to the yoke.

  A speaker device according to a twelfth aspect of the present invention includes the speaker magnetic circuit according to the first aspect, a frame that supports the speaker magnetic circuit, and a vibrating body that is supported by the frame. The vibrating body includes an edge portion, a vibrating portion, and a voice coil.

  According to a thirteenth aspect of the present invention, an electronic apparatus includes the speaker device according to the twelfth aspect.

The best mode for carrying out the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a schematic cross-sectional view showing a configuration of a speaker device to which a speaker magnetic circuit 1 according to Embodiment 1 of the present invention is applied. FIG. 2 shows a state in which a vibrating body 3 is removed from the speaker device shown in FIG. It is the schematic sectional drawing cut | disconnected by the part (refer FIG. 3) different from FIG. 1 among structures. 3 is a perspective view of the speaker device shown in FIG. 2 with the outer plate 15 removed, and FIG. 4 is a rear view showing the configuration of the speaker device shown in FIG. 1 is a cross-sectional view taken along line AA in a state where the vibrating body 3 and the outer plate 15 are attached to the speaker device shown in FIG. 3, and FIG. 2 is a cross-sectional view taken along line BB in FIG.

The speaker device according to the first embodiment includes a speaker magnetic circuit 1, a frame 2, and a vibrating body 3. The speaker magnetic circuit 1 is an inner magnet type and an outer magnet type (hereinafter referred to as “inner magnet type”) in which an inner magnet 12 and an outer magnet 13 are sandwiched by a yoke 11, an inner plate 14, and an outer plate 15. The inner plate 14 and the inner magnet 12 are fixed to the yoke 11 by a fixing member 16. In addition, although the example which employ | adopts the internal-magnet-type speaker magnetic circuit 1 is shown in this Embodiment 1, it is not limited to this, The outer-magnet type | mold which arrange | positions a magnet outside the voice coil mentioned later A magnetic circuit for a speaker and an internal magnetic type magnetic circuit for a speaker in which a magnet is disposed only inside the voice coil may be adopted.
In the first embodiment, an example is shown in which the inner magnet 12 and the outer magnet 13 are magnetized in the thickness direction, but the present invention is not limited to this. For example, a direction intersecting the thickness direction, for example, A so-called “radial magnet” magnetized in the horizontal direction may be used. When a radial magnet is used, the inner plate 14 and the outer plate 15 do not have to be used, so the speaker magnetic circuit 1 has a yoke 11, an inner magnet 12 and an outer magnet 13.

  The yoke 11 is made of a magnetic material such as pure iron, oxygen-free steel, or silicon steel. As shown in FIG. 5, the yoke 11 has a generally rectangular plane shape and is chamfered at four corners. FIG. 5 is a rear view showing the configuration of the yoke 11 constituting the speaker device shown in FIG. Through holes 11e and 11g each having a substantially rectangular shape are formed in the center of the two opposite sides 11a and 11c of the yoke 11 and in the vicinity thereof. On the other hand, through holes 11f and 11h each having a substantially rectangular shape are formed in the center of the two opposite sides 11b and 11d of the yoke 11 and at positions where the distance between the side 11b and the side 11d is substantially divided into three. It is installed. The through holes 11e, 11f, 11g, and 11h all have substantially the same rectangular shape and have substantially the same dimensions.

  The inner magnet 12 and the outer magnet 13 are made of, for example, a permanent magnet such as a rare earth (eg, neodymium), samarium / cobalt, alnico, or ferrite magnet. The inner magnet 12 has a substantially rectangular shape. On the other hand, the outer magnet 13 has a substantially rectangular ring shape. All four corners of the outer periphery of the inner magnet 12 and the outer magnet 13 are chamfered. In addition, the four corners of the inner periphery of the outer magnet 13 are also chamfered. The outer diameter of the outer magnet 13 is substantially the same as or slightly larger than the outer diameter of the yoke 11.

  The inner plate 14 and the outer plate 15 are made of a magnetic material such as pure iron, oxygen-free steel, or silicon steel, for example. The planar shape of the inner plate 14 is substantially rectangular. On the other hand, the planar shape of the outer plate 15 has a substantially rectangular ring shape. Although not shown in the drawings, the four corners of the outer periphery of each of the inner plate 14 and the outer plate 15 are chamfered. Further, although not shown, chamfering is also performed on the four corners of the inner periphery of the outer plate 15. The outer diameter of the outer plate 15 is substantially the same as or slightly smaller than the outer diameter of the yoke 11. The chamfering of the outer peripheral four corners of the inner plate 14 and the chamfering of the inner peripheral four corners of the outer plate 15 are both necessary to maintain a predetermined gap (clearance) in order to avoid contact with the voice coil support portion 22 described later. Has been. The inner diameter of the outer plate 15 is substantially the same as or slightly smaller than the inner diameter of the outer magnet 13.

  The inner magnet 12 and the inner plate 14 are accommodated in the accommodating portion 17 that constitutes the fixing member 16 so that the central axes in the thickness direction of the inner magnet 12 and the inner plate 14 substantially overlap each other. The fixing member 16 is made of, for example, a high conductivity material such as copper, aluminum, or galvanized steel. As shown in FIG. 6, the fixed member 16 has a substantially rectangular plane shape and is chamfered at four corners of the upper outer periphery.

  The fixing member 16 is configured by integrally forming an upper plate portion 16a, a rectangular ring portion 16b, and hanging portions 16c, 16d, 16e, and 16f. The upper plate portion 16a is provided with an opening portion 16aa having a substantially rectangular shape. A rectangular ring portion 16b having a substantially rectangular ring shape is formed on the outer peripheral edge of the upper plate portion 16a. Hanging portions 16c, 16d, 16e, and 16f are formed at substantially the center of the four sides of the rectangular ring portion 16b, respectively. When the fixing member 16 is not used, the drooping portions 16c, 16d, 16e, and 16f are not bent, and are substantially flush with each side of the corresponding angular ring portion 16b up to the respective distal ends 16ca, 16da, 16ea, and 16fa. It is formed so as to be located above.

  In order to fix the inner plate 14 and the inner magnet 12 to the yoke 11 using the fixing member 16, first, the fixing member 16 is configured in a state where the inner plate 14 is stacked on the upper side and the inner magnet 12 is on the lower side. The upper plate 16a is accommodated in the fixing member 16 so that the upper surface of the inner plate 14 is in contact with the lower surface of the upper plate portion 16a. Next, the tips 16ca, 16da, 16ea, and 16fa of the hanging parts 16c, 16d, 16e, and 16f of the fixing member 16 in which the inner plate 14 and the inner magnet 12 are accommodated are correspondingly formed in the yoke 11. The inner magnet 12 is inserted into the through holes 11e, 11f, 11g, and 11h, and the lower surface of the inner magnet 12 is brought into contact with the upper surface of the yoke 11. And as shown in FIG. 4, each front-end | tip 16ca, 16da, 16ea, and 16fa of hanging part 16c, 16d, 16e, and 16f is bent toward the lower surface (bottom part) center 11j of the yoke 11. As shown in FIG. As a result, the tips 16ca, 16da, 16ea and 16fa of the hanging parts 16c, 16d, 16e and 16f constituting the fixing member 16 engage with the bottom of the yoke 11, and the inner plate 14 and the inner magnet 12 are fixed to the yoke 11. Is done. The fixing member 16 used as described above is composed of the accommodating portion 17 in which the inner magnet 12 and the inner plate 14 are accommodated, and the engaging portion 18 that engages with the bottom portion of the yoke 11. it can.

  Note that the tips 16ca, 16da, 16ea, and 16fa of the hanging portions 16c, 16d, 16e, and 16f are not limited to bend all toward the lower surface (bottom) center 11j of the yoke 11, but the tips 16ca, 16da, 16ea And all or part of 16fa may be bent away from the lower surface center 11j of the yoke 11. However, the former is more advantageous in that the occupied area at the bottom of the yoke 11 is smaller than the latter. As the fixing strength, since the material and manufacturing method of the fixing member 16 are related, it cannot be said that the former is generally stronger than the latter.

  Here, as a fixing method for fixing the inner magnet 12 and the inner plate 14 to the yoke 11, a fixing method corresponding to “engagement” in which a plurality of components are engaged is used, but is not limited thereto. As a fixing method for fixing the inner magnet 12 and the inner plate 14 to the yoke 11, for example, “locking” in which a plurality of components are engaged and stopped, and a plurality of components are adjusted so as not to be separated. Fixing methods corresponding to “joining”, “joining” meaning that a plurality of components are joined together, and “fitting” meaning that a plurality of components having the same shape are fitted may be used.

In short, when the inner magnet 12 or the inner plate 14 is fixed to the yoke 11, no adhesive is used, and at least the thickness of the speaker magnetic circuit 1 in the direction parallel to the sound radiation direction of the speaker device is not increased. Any fixing method may be used as long as it is a method. The term “engagement” in the claims does not include the concept of “engagement” in the original meaning, “locking” and “fitting” as described above, and adhesion using an adhesive. The meanings of “bonding” and “joining” are also included. These can also be collectively referred to as “mechanical fixation”.
In addition, in order to improve the joining force of the yoke 11 and the fixing member 16, well-known techniques, such as an adhesive agent and welding, can be used.

  An outer magnet 13 and an outer plate 15 are sequentially fixed by an adhesive or the like on the upper surface of the yoke 11 and on the peripheral portion 11m. The speaker magnetic circuit 1 assembled as described above has an outer peripheral surface, that is, an outer peripheral surface of the outer plate 15, an outer peripheral surface of the outer magnet 13, and an outer peripheral surface of the yoke 11 attached to the inner peripheral surface of the frame 2. It is accommodated in the frame 2 by being fixed by, for example. In the speaker magnetic circuit 1, a magnetic gap is formed between the outer peripheral portion of the inner plate 14 accommodated in the fixing member 16 and the inner peripheral portion of the outer plate 15. In the magnetic gap, a substantially uniform magnetic flux density distribution is formed over the entire circumference.

  The frame 2 has a substantially rectangular shape with a hollow overall shape. The frame 2 is made of, for example, a ferrous metal, a non-ferrous metal or an alloy thereof, a synthetic resin, or the like. Examples of the iron-based metal include pure iron, oxygen-free steel, and silicon steel. Examples of the non-ferrous metal include aluminum, magnesium, and zinc. Examples of synthetic resins include thermoplastic resins such as olefins such as polypropylene (PP), ABS (acrylonitrile, butadiene, styrene), and polyethylene terephthalate (PET), or the thermoplastic resins described above, and glass as a reinforcing filler. There are those obtained by adding fibers or fibrillated thermotropic liquid crystal polyester resins. The frame 2 is formed by, for example, drawing a ferrous metal, die casting a non-ferrous metal or an alloy thereof, or injection molding a synthetic resin.

The vibrating body 3 includes a diaphragm 21 and a voice coil 22. The diaphragm 21 includes a first vibration part 31, a voice coil support part (voice coil bobbin) 32, a second vibration part 33, and an edge 34. The diaphragm 21 has a substantially rectangular planar shape.
In the first embodiment, the voice coil support portion 32 is formed in a flat shape, and the upper end portion of the voice coil 22 is joined to the voice coil support portion 32 with an adhesive or the like. However, the present invention is not limited to this, and the voice coil support portion is formed in a shape that can accommodate the voice coil 22, that is, formed in a convex shape (for example, a U shape) toward the opposite side to the acoustic radiation direction, The voice coil 22 may be arranged on the upper surface side of the part.

  Examples of the material of the diaphragm 21 include paper, a woven fabric using fibers, a knitted fabric using fibers, a nonwoven fabric, a woven fabric using fibers, a resin such as a phenolic resin or a silicone resin, or these resins. Examples include a material impregnated with a solution composed of an organic solvent, a metal material, a synthetic resin, an acrylic foam, and a hybrid material composed of a synthetic resin and a metal. Examples of the metal material include aluminum, titanium, duralumin, beryllium, magnesium, and alloys thereof. Examples of the synthetic resin include polypropylene, polyethylene, polystyrene, polyethylene terephthalate, polyethylene naphthalate, polymethyl methacrylate, polycarbonate, polyarylate, epoxy resin, polysulfone, polyurethane having a urethane bond, and rubber.

  As for the longitudinal cross-sectional shape of the 1st vibration part 31, a center part protrudes in a substantially trapezoid shape on the back side (opposite side with respect to an acoustic radiation direction) of a speaker apparatus, and an outer peripheral part is on the surface side (acoustic radiation direction) of a speaker apparatus. It has a shape that protrudes in a substantially trapezoidal shape. However, the present invention is not limited to this, and the vertical cross-sectional shape of the first vibrating portion 31 may be formed in a flat plate shape or a curved shape. A voice coil support portion 32 is integrally formed on the outer peripheral portion of the first vibrating portion 31. The planar shape of the voice coil support part 32 has a substantially square ring shape. The voice coil 22 is wound around the lower surface of the voice coil support portion 32 a predetermined number of times, and the molded voice coil 22 is fixed with an adhesive or the like. The voice coil 22 is loosely inserted in a magnetic gap formed between the outer periphery of the inner plate 14 of the speaker magnetic circuit 1 and the inner periphery of the outer plate 15.

  A second vibrating portion 33 is formed integrally with the outer periphery of the voice coil support portion 32. The vertical cross-sectional shape of the second vibrating portion 33 has a shape in which the central portion protrudes in a substantially trapezoidal shape on the surface side (acoustic radiation direction) of the speaker device. However, the present invention is not limited to this, and the vertical cross-sectional shape of the second vibrating portion 33 may be formed in a flat plate shape or a curved shape. An edge 34 is integrally formed on the outer peripheral portion of the second vibrating portion 33. The edge 34 has a substantially roll shape in which the planar shape has a substantially rectangular ring shape and the longitudinal cross-sectional shape protrudes to the surface side (acoustic radiation direction) of the speaker device. The edge 34 has appropriate compliance (rigidity) and has no air permeability. The vertical cross-sectional shape of the outer peripheral portion of the edge 34 has a flat shape. The upper surface of the outer peripheral portion of the edge 34 is fixed to the upper portion of the frame 2 through the baffle 23. The edge 34 and the baffle 23, and the baffle 23 and the upper portion of the frame 2 are fixed by an adhesive or the like. The planar shape of the baffle 23 has a substantially square ring shape.

  As described above, according to the first embodiment of the present invention, in the state where the accommodating portion 17 of the fixing member 16 accommodates the inner plate 14 and the inner magnet 12, the engaging portion 18 of the fixing member 16 is located on the bottom portion of the yoke 11. By engaging, the inner plate 14 and the inner magnet 12 are fixed to the yoke 11 without using an adhesive. Therefore, even when the inner magnet 12 is the same size as the inner plate 14, the adhesive protrudes from the joint surface between the inner plate 14 and the inner magnet 12, and the protruding adhesive is a speaker device such as the voice coil 22. It is possible to suppress the possibility of affecting the performance of the speaker device, such as generating abnormal noise, by contacting or adhering to these components. In addition, since no adhesive is used, in the manufacturing process of the speaker device, there is no need to provide an adhesive drying device or drying time compared to the case where an adhesive is used, and accordingly, the equipment can be configured at a low cost, The working environment is improved and the working efficiency can be improved.

  In addition, according to the first embodiment of the present invention, components such as the inner plate 14 and the inner magnet 12 are particularly reduced in a miniaturized speaker device such as a speaker device mounted on a portable electronic device such as a mobile phone. Even if it is small, it is possible to obtain a sufficient fixing strength because it is firmly fixed to the yoke 11 using the fixing member 16 without fixing each component using an adhesive.

  Furthermore, according to the first embodiment of the present invention, for example, the inner plate 14 having a substantially rectangular shape is manufactured by pressing a magnetic material such as iron, so that a so-called “burr” is formed on the outer peripheral portion of the inner plate 14. Even when the “sagging” is formed, the inner plate 14 is accommodated in the accommodating part 17 of the fixing member 16, so that “burrs” and “sagging” formed on the outer peripheral part of the inner plate 14 are also obtained. "Can be prevented from coming into contact with the voice coil 22 and generating abnormal noise. In addition, the amplitude of the voice coil 22, particularly the amplitude to the back side of the speaker device (the side opposite to the acoustic radiation direction) can be sufficiently secured.

  Moreover, according to Embodiment 1 of this invention, the fixing member 16 is comprised from high electrical conductivity materials, such as copper, aluminum, galvanized steel, for example, and has covered most of the surfaces of the inner plate 14. That is, the fixing member 16 also has a so-called short ring function. For this reason, it is possible to suppress the occurrence of distortion due to the nonlinearity of the magnetic permeability of the magnetic material constituting the speaker magnetic circuit 1 (this is referred to as “current distortion”), in particular, second-order harmonic distortion. Thereby, the fall of the acoustic characteristic of a speaker apparatus, especially the characteristic of a high frequency area | region can be improved.

  Furthermore, according to Embodiment 1 of the present invention, unlike the above-described conventional speaker device, it is not necessary to dispose the bottom of the frame below the bottom of the yoke, so that the thickness of the speaker device is made relatively thin. be able to. For this reason, a speaker apparatus can be accommodated comparatively easily in the specified space which portable electronic devices, such as a mobile phone, have.

  Further, according to the first embodiment of the present invention, since the opening 16aa is formed in the upper plate portion 16a constituting the fixing member 16, the first vibrating portion 31 is prevented from coming into contact with the fixing member 16. In addition, the overall height of the diaphragm 21 including the first vibrating portion 31 can be made relatively large while being matched with a specified height of a portable electronic device such as a mobile phone.

Furthermore, according to the first embodiment of the present invention, the through holes 11e, 11f, 11g, and 11h drilled in the yoke 11 can be used as vent holes. Therefore, the through-holes 11e, 11f, by adjusting the size of 11g and 11h, and the like can be adjusted minimum resonance frequency f ₀ of the speaker device by controlling the back pressure of the speaker device, thereby improving the acoustic characteristics of the speaker device be able to. Further, the temperature in the speaker magnetic circuit can be relatively lowered, and the speaker device can be driven stably over a long period of time.

Embodiment 2. FIG.
FIG. 7 is a schematic cross-sectional view showing the configuration of the speaker device to which the speaker magnetic circuit 41 according to Embodiment 2 of the present invention is applied, with the vibrating body removed, and FIG. 8 is the configuration of the speaker device shown in FIG. FIG. 9 is a rear view showing the configuration of the yoke 43 constituting the speaker device shown in FIG. 7, and FIG. 10 is a perspective view showing the configuration of the fixing member 42 constituting the speaker device shown in FIG. 7 to 10, portions corresponding to the respective portions in FIGS. 1 to 6 are denoted by the same reference numerals, and description thereof is omitted.

The speaker device shown in FIGS. 7 and 8 is different from the speaker device shown in FIGS. 1 to 4 in that a speaker magnetic circuit 41 is newly provided in place of the speaker magnetic circuit 1. The speaker magnetic circuit 41 is an inner magnet type in which an inner magnet 12 and an outer magnet 13 are sandwiched by a yoke 43, an inner plate 14 (not shown) and an outer plate 15, and the inner plate 14 and the inner magnet 12 are fixed members. 42 is fixed to the yoke 43.
In addition, although the example which employ | adopts the internal-magnet-type speaker magnetic circuit 41 is shown in this Embodiment 2, it is not limited to this, The outer-magnet type | mold which arrange | positions a magnet outside a voice coil mentioned later A magnetic circuit for a speaker and an internal magnetic type magnetic circuit for a speaker in which a magnet is disposed only inside the voice coil may be adopted.
In the second embodiment, an example is shown in which the inner magnet 12 and the outer magnet 13 are magnetized in the thickness direction, but the present invention is not limited to this. For example, a direction intersecting the thickness direction, for example, A so-called “radial magnet” magnetized in the horizontal direction may be used. When a radial magnet is used, the inner plate 14 and the outer plate 15 do not have to be used, so that the speaker magnetic circuit 41 includes the yoke 43, the inner magnet 12, and the outer magnet 13.

  The yoke 43 is made of the same material as the yoke 11 described above, for example. First, the yoke 43 is the same as the yoke 11 in that the overall shape of the plane of the yoke 43 is substantially rectangular and the four corners are chamfered. Further, the through holes 43e, 43f, 43g, and 43h all have substantially the same rectangular shape and have substantially the same dimensions.

  Next, the yoke 43 shown in FIG. 9 is different from the yoke 11 shown in FIG. 5 as follows. That is, in FIG. 5, the through holes 11 e, 11 f, 11 g and 11 h are all drilled at parallel positions from the respective centers of the corresponding four sides 11 a, 11 b, 11 c and 11 d of the yoke 11. On the other hand, in FIG. 9, the through holes 43 e and 43 g are formed in parallel positions from the center of the corresponding two sides 43 a and 43 c of the yoke 43, but the through holes 43 f and 43 h are formed in the yoke 43. The corresponding two sides 43b and 43d are formed by being slightly shifted from the center to the left and right from the center.

  The fixing member 42 is made of, for example, the same material as the above-described fixing member 16. First, as shown in FIG. 10, the fixing member 42 has the above-described fixing member 16 (FIG. 6) with respect to the fact that the overall shape of the plane is substantially rectangular and that the upper outer peripheral four corners are chamfered. See). In addition, the fixing member 42 is configured by integrally forming an upper plate portion 42a, a rectangular ring portion 42b, and hanging portions 42c, 42d, 42e, and 42f (see FIG. 5). ). Further, the upper plate portion 42a is similar to the fixing member 16 (see FIG. 6) in that a substantially rectangular opening 42aa is formed.

  Next, the difference between the fixing member 42 shown in FIG. 10 and the fixing member 16 shown in FIG. 6 is as follows. That is, in FIG. 6, the hanging parts 16c, 16d, 16e, and 16f are connected to substantially the center of the four sides of the corresponding angular ring part 16b. The hanging portions 16c, 16d, 16e, and 16f are formed to have the same width up to the connecting portions with the corresponding four sides of the angular ring portion 16b and the respective tips 16ca, 16da, 16ea, and 16fa.

  On the other hand, in FIG. 10, the drooping portions 42c and 42e are connected to substantially the center of the two sides of the corresponding angular ring portion 42b, but the drooping portions 42d and 42f are two of the corresponding angular ring portion 42b. It is connected slightly off the approximate center of the side. In the example of FIG. 10, the drooping portion 42d is connected to the left side in the drawing slightly shifted from the approximate center of the side of the corresponding angular ring portion 42b, whereas the drooping portion 42f is connected to the corresponding angular ring portion 42b. It is connected with a slight shift from the approximate center of the side to the right side in the figure. That is, the inner surfaces of the hanging portions 42c and 42e are opposed to each other, whereas the hanging portions 42d and 42f are opposed to only a part of the inner surface. The positional relationship between the hanging portions 42c and 42e is opposed to the positional relationship between the through holes 43f and 43h in the yoke 43 described above.

  Next, the hanging portions 42c, 42d, 42e, and 42f are positioned at the same width at positions 42ca, 42da, 42ea, and 42fa from the connecting portion with the four sides of the corresponding square ring portion 42b to approximately two-thirds of the total length. Is formed. However, in the hanging portions 42c, 42d, 42e, and 42f, the widths from the respective positions 42ca, 42da, 42ea, and 42fa to the respective tips 42cb, 42db, 42eb, and 42fb are formed narrow so as not to interfere with each other. It can be said that the fixing member 42 described above includes a housing portion 44 in which the inner magnet 12 and the inner plate 14 (not shown) are housed, and an engaging portion 45 that engages with the bottom portion of the yoke 43. . The method for assembling the speaker magnetic circuit 41 is substantially the same as the method for assembling the speaker magnetic circuit 1 in the first embodiment.

  Thus, according to the second embodiment of the present invention, the position of the engaging portion 45 where the fixing member 42 engages with the yoke 43 is removed from the lower surface center 43j of the yoke 43, and the length of the engaging portion 45 is increased. Secured. 4 to 6 in the first embodiment described above, the through hole 11f, the through hole 11h, the hanging part 16d, and the hanging part 16f are all at the center line in the longitudinal direction of the yoke 11 and the fixing member 16. On the other hand, in the example of FIGS. 8 to 10, the through hole 11 f and the through hole 11 h, and the hanging part 16 d and the hanging part 16 f are all centered on the lower surface center 43 j of the yoke 43 and the fixing member 42. Is point-symmetric. Thus, the speaker magnetic circuit 41 according to the second embodiment of the present invention ensures a large contact area between the yoke 43 and the fixing member 42 as compared with the speaker magnetic circuit 1 according to the first embodiment described above. Therefore, the fixing strength can be increased accordingly.

Embodiment 3 FIG.
FIG. 11 is a schematic cross-sectional view showing the configuration of the speaker device to which the speaker magnetic circuit 51 according to Embodiment 3 of the present invention is applied, with the vibrating body removed, and FIG. 12 shows the configuration of the speaker device shown in FIG. FIG. FIG. 13 is a perspective view showing the configuration of the fixing member 52 constituting the speaker device shown in FIG. 11 to 13, parts corresponding to those in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof is omitted.

The speaker device shown in FIGS. 11 and 12 is different from the speaker device shown in FIGS. 1 to 4 in that a speaker magnetic circuit 51 is newly provided in place of the speaker magnetic circuit 1. The speaker magnetic circuit 51 is an inner magnet type in which an inner magnet 12 and an outer magnet 13 are sandwiched between a yoke 11, an inner plate 14 and an outer plate 15, and the inner plate 14 and the inner magnet 12 are fixed to the yoke 11 by a fixing member 52. It is fixed to.
In the third embodiment, an example in which the inner-magnet-type speaker magnetic circuit 51 is employed is shown. A magnetic circuit for a speaker and an internal magnetic type magnetic circuit for a speaker in which a magnet is disposed only inside the voice coil may be adopted.
In the third embodiment, an example is shown in which the inner magnet 12 and the outer magnet 13 are magnetized in the thickness direction, but the present invention is not limited to this. For example, a direction intersecting the thickness direction, for example, A so-called “radial magnet” magnetized in the horizontal direction may be used. When a radial magnet is used, the inner plate 14 and the outer plate 15 do not have to be used, so the speaker magnetic circuit 51 includes the yoke 11, the inner magnet 12, and the outer magnet 13.

  The fixing member 52 is made of the same material as the above-described fixing members 16 and 42, for example. As shown in FIG. 13, the fixing member 52 has a substantially cross-shaped planar shape. The fixing member 52 is configured by integrally forming an upper plate portion 52a and hanging portions 52b, 52c, 52d, and 52e. The upper plate portion 52a is formed by integrally forming a central portion 52aa having a substantially rectangular shape and projecting portions 52ab, 52ac, 52ad, and 52ae projecting from the four sides of the central portion 52aa in a substantially horizontal direction.

  The overhang portion 52ab and the overhang portion 52ac are opposed to each other with the central portion 52aa interposed therebetween, and the overhang portion 52ad and the overhang portion 52ae are opposed to each other with the central portion 52aa interposed therebetween. The lengths of the overhang portion 52ab and the overhang portion 52ac are substantially the same, and the lengths of the overhang portion 52ad and the overhang portion 52ae are substantially the same. In the example of FIG. 13, the lengths of the overhang portion 52ab and the overhang portion 52ac are approximately four times the respective lengths of the overhang portion 52ad and the overhang portion 52ae.

  A hanging part 52b is formed at one end of the projecting part 52ab opposite to the connection part with the central part 52aa, and a hanging part 52d is formed at one end of the projecting part 52ac opposite to the connection part with the central part 52aa. Is formed. Similarly, a hanging portion 52c is formed at one end of the overhanging portion 52ad opposite to the connection portion with the central portion 52aa, and an end of the overhanging portion 52ae opposite to the connection portion with the central portion 52aa is formed at the one end. A hanging portion 52e is formed.

  When the fixing member 52 is not used, the hanging portions 52b, 52c, 52d, and 52e are not bent, and the corresponding protruding portions 52ab, 52ac, 52ad, and 52ae are extended to the respective ends 52ba, 52ca, 52da, and 52ea. It is formed so as to be located on substantially the same plane as each end. The hanging portions 52b, 52c, 52d and 52e are formed to have the same width up to the connecting portions with the respective ends of the corresponding overhanging portions 52ab, 52ac, 52ad and 52ae and the respective tips 52ba, 52ca, 52da and 52ea. . It can be said that the fixing member 52 described above includes a housing portion 53 in which the inner magnet 12 and the inner plate 14 are housed, and an engaging portion 54 that engages with the bottom portion of the yoke 11. The method for assembling the speaker magnetic circuit 51 is substantially the same as the method for assembling the speaker magnetic circuit 1 in the first embodiment.

  As described above, according to the third embodiment of the present invention, similar to the speaker magnetic circuit 1 and the speaker device having the speaker magnetic circuit 1 according to the first embodiment, the working efficiency is improved and the fixing is sufficiently performed. Obtaining strength, suppressing the generation of abnormal noise, ensuring sufficient amplitude to the back side of the speaker device (opposite to the sound radiation direction), acoustic characteristics of the speaker device, particularly high Compare the drop in characteristics in the frequency domain, relatively easily accommodate the speaker device in a specified space of a portable electronic device such as a mobile phone, and compare the overall height of the diaphragm 21 including the first vibrating portion 31 It is possible to increase the target size, to improve the acoustic characteristics of the speaker device, to relatively lower the temperature in the magnetic circuit, and to drive the speaker device stably over a long period of time. Further, according to the third embodiment of the present invention, since the fixing member 52 can be made of a minimum necessary material, the speaker magnetic circuit 51 can be reduced in weight.

Embodiment 4 FIG.
FIG. 14 is a schematic cross-sectional view showing the configuration of the speaker device to which the speaker magnetic circuit 61 according to Embodiment 4 of the present invention is applied, with the vibrating body removed, and FIG. 15 shows the configuration of the speaker device shown in FIG. FIG. 14 and 15, the same reference numerals are given to portions corresponding to the respective portions in FIGS. 11 and 12, and the description thereof is omitted.

The speaker device shown in FIGS. 14 and 15 is different from the speaker device shown in FIGS. 11 and 12 in that a speaker magnetic circuit 61 is newly provided in place of the speaker magnetic circuit 51. The speaker magnetic circuit 61 is an inner magnet type in which the inner magnet 12 and the outer magnet 13 are sandwiched between the yoke 62, the inner plate 14 and the outer plate 15, and the inner plate 14 and the inner magnet 12 are connected to the yoke 62 by the fixing member 52. It is fixed to.
In addition, although the example which employ | adopts the internal-magnet-type speaker magnetic circuit 61 is shown in this Embodiment 4, it is not limited to this, The outer-magnet type | mold which arrange | positions a magnet outside a voice coil mentioned later A magnetic circuit for a speaker and an internal magnetic type magnetic circuit for a speaker in which a magnet is disposed only inside the voice coil may be adopted.
In the fourth embodiment, the inner magnet 12 and the outer magnet 13 are magnetized in the thickness direction. However, the present invention is not limited to this, and the direction intersecting the thickness direction, for example, A so-called “radial magnet” magnetized in the horizontal direction may be used. When a radial magnet is used, the inner plate 14 and the outer plate 15 do not have to be used. Therefore, the speaker magnetic circuit 61 includes the yoke 62, the inner magnet 12, and the outer magnet 13.

  The yoke 62 is made of the same material as the yokes 11 and 43 described above, for example. First, in the yoke 62, the point that the overall shape of the plane has a substantially rectangular shape, the point that the four corners are chamfered, and the through holes 62e, 62f, 62g, and 62h all have a substantially identical rectangular shape. The same dimensions as the yokes 11 and 43 are the same. The positional relationship between the through holes 62e, 62f, 62g, and 62h in the yoke 62 is the same as the positional relationship between the through holes 11e, 11f, 11g, and 11h in the yoke 11.

  Next, the yoke 62 shown in FIG. 14 is different from the yoke 11 shown in FIG. 11 as follows. That is, in FIG. 11, the bottom of the yoke 11 forms the same plane, whereas in FIG. 14, the bent portions of the hanging portions 52b, 52c, 52d and 52e constituting the fixing member 52 are inserted. Recessed portions 62i, 62j, 62k and 62m are formed. The method for assembling the speaker magnetic circuit 61 is substantially the same as the method for assembling the speaker magnetic circuit 1 in the first embodiment.

  As described above, according to the fourth embodiment of the present invention, as in the speaker magnetic circuit 51 and the speaker device having the speaker magnetic circuit 51 according to the third embodiment, the working efficiency is improved and the fixing is sufficiently performed. Obtaining strength, suppressing the generation of abnormal noise, ensuring sufficient amplitude to the back side of the speaker device (opposite to the sound radiation direction), acoustic characteristics of the speaker device, particularly high Compare the drop in characteristics in the frequency domain, relatively easily accommodate the speaker device in a specified space of a portable electronic device such as a mobile phone, and compare the overall height of the diaphragm 21 including the first vibrating portion 31 Increase the sound characteristics of the speaker device, improve the acoustic characteristics of the speaker device, relatively lower the temperature in the magnetic circuit, and drive the speaker device stably over a long period of time. . Further, according to the fourth embodiment of the present invention, the bent portions of the hanging portions 52b, 52c, 52d and 52e constituting the engaging portion 54 are inserted into the recesses 62i, 62j, 62k and 62m. Compared to the third embodiment, the thickness of the speaker magnetic circuit 61 can be reduced by the thickness of the engaging portion 54 of the fixing member 52. Since the thickness of the speaker magnetic circuit 61 can be reduced, the speaker device can be reduced and the speaker device can be accommodated in a prescribed space.

Embodiment 5 FIG.
The speaker devices according to the first to fourth embodiments described above are used by being mounted on a portable electronic device such as a mobile phone, a portable radio, or a PDA. For example, a mobile phone is roughly configured from a display synthesis circuit, an antenna, a communication unit, an MPU, a storage unit, an operation unit, a transmission / reception unit, a display unit, and the like. The display composition circuit synthesizes still or moving image data supplied from the MPU and information in the mobile phone such as battery remaining amount information and antenna sensitivity information, and displays the combined information on the display unit. The communication unit receives a radio telephone signal transmitted from the base station via an antenna, demodulates it into a voice signal, still image data, moving image data, communication data, or a control signal and supplies it to the MPU. In addition, the communication unit modulates a voice signal, still image data, moving image data, communication data, or control signal supplied from the MPU into a radio telephone signal and transmits it to the base station via an antenna.

  The MPU executes various programs stored in the storage unit to control each unit of the mobile phone, and uses a control signal supplied from the communication unit for processing inside the MPU. In addition, the MPU processes the audio signal supplied from the communication unit and supplies it to the transmission / reception unit, and also processes the audio signal supplied from the transmission / reception unit to supply to the communication unit. Further, the MPU processes still image data and moving image data supplied from the communication unit and supplies them to the display composition circuit, and also processes still image data and moving image data supplied from the camera unit to the communication unit. Supply. The storage unit stores various programs executed by the MPU and various data such as a telephone number of a destination set by the user operating the operation unit.

  The operation unit includes a numeric keypad used for inputting the telephone number of the other party, various buttons for instructing call permission, call termination, display switching, correction of the current date, and the like. The transmission / reception unit includes the speaker device and the microphone according to any one of the first to fourth embodiments. The transmission / reception unit emits sound from the speaker device based on the sound signal supplied from the MPU, and supplies the sound signal converted from the sound by the microphone to the MPU, so that it is used for communication with the other party. . The display unit includes a display and a drive circuit for driving them. Thus, according to Embodiment 5 of the present invention, the speaker device can be accommodated in a prescribed space of the mobile phone.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention.
In addition, each of the above-described embodiments can divert each other's technology as long as there is no particular contradiction or problem in its purpose and configuration.

It is a schematic sectional drawing which shows the structure of the speaker apparatus to which the magnetic circuit for speakers concerning Embodiment 1 of this invention is applied. It is the schematic sectional drawing cut | disconnected by the part different from FIG. 1 among the structures in the state which removed the vibrating body in the speaker apparatus shown in FIG. It is a perspective view in the state which removed the outer plate in the speaker apparatus shown in FIG. It is a rear view which shows the structure of the speaker apparatus shown in FIG. It is a rear view which shows the structure of the yoke which comprises the speaker apparatus shown in FIG. It is a perspective view which shows the structure of the fixing member which comprises the speaker apparatus shown in FIG. It is a schematic sectional drawing which shows the structure in the state which removed the vibrating body in the speaker apparatus to which the magnetic circuit for speakers concerning Embodiment 2 of this invention is applied. It is a rear view which shows the structure of the speaker apparatus shown in FIG. It is a top view which shows the structure of the yoke which comprises the speaker apparatus shown in FIG. It is a perspective view which shows the structure of the fixing member which comprises the speaker apparatus shown in FIG. It is a schematic sectional drawing which shows the structure in the state which removed the vibrating body in the speaker apparatus to which the magnetic circuit for speakers concerning Embodiment 3 of this invention is applied. It is a rear view which shows the structure of the speaker apparatus shown in FIG. It is a perspective view which shows the structure of the fixing member 52 which comprises the speaker apparatus shown in FIG. It is a schematic sectional drawing which shows the structure in the state which removed the vibrating body in the speaker apparatus to which the magnetic circuit for speakers which concerns on Embodiment 4 of this invention is applied. It is a rear view which shows the structure of the speaker apparatus shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,41,51,61 ... Magnetic circuit for speakers, 2 ... Frame, 2a ... Upper surface, 3 ... Vibrating body, 11, 43, 62 ... Yoke, 11a, 11b, 11c, 11d, 43a, 43b, 43c, 43d, 62a, 62b, 62c, 62d,..., Sides, 11e, 11f, 11g, 11h, 43e, 43f, 43g, 43h, 62e, 62f, 62g, 62h, through holes, 11j, 43j, lower surface (bottom) center, 11m,. Peripheral part, 12 ... inner magnet, 13 ... outer magnet, 14 ... inner plate, 15 ... outer plate, 16, 42, 52 ... fixing member, 16a, 42a, 52a ... upper plate part, 16aa, 42aa ... opening, 16b , 42b ... angular ring portion, 16c, 16d, 16e, 16f, 42c, 42d, 42e, 42f, 52b, 52c, 52d, 52e ... hanging portion, 16ca, 16da, 16 a, 16fa, 42cb, 42db, 42eb, 42fb, 52ba, 52ca, 52da, 52ea ... tip, 17, 44, 53 ... receiving part, 18, 45, 54 ... engaging part, 21 ... diaphragm, 22 ... voice coil , 23 ... baffle, 31 ... first vibration part, 32 ... voice coil support part (voice coil bobbin), 33 ... second vibration part, 34 ... edge, 42ca, 42da, 42ea, 42fa ... position, 52aa ... center part, 52ab , 52ac, 52ad, 52ae ... overhang, 62i, 62j, 62k, 62m ... recess

Claims (13)

At least a magnet, a yoke, and a fixing member;
The speaker magnetic circuit, wherein the magnet is fixed to the yoke by engaging the yoke in a state where the fixing member accommodates the magnet. The fixing member includes an engaging portion;
The magnetic circuit for a speaker according to claim 1, wherein the engaging portion is inserted into an opening formed in the yoke, bent, and engaged with the yoke. The magnetic circuit for a speaker according to claim 2, wherein the fixing member includes a housing portion that houses the magnet. The magnetic circuit for a speaker according to claim 3, wherein an opening is formed in a surface on the acoustic radiation side of the housing portion. The speaker magnetic circuit according to claim 4, wherein the opening formed in the yoke communicates with the outside. The magnetic circuit for a speaker according to claim 5, wherein the engaging portion extends from an end portion of the housing portion toward the inside of the housing portion. The magnetic circuit for a speaker according to claim 5, wherein the engaging portion extends toward the inside of the yoke and supports the bottom of the yoke. The end of the engaging portion is arranged so as to be point-symmetric with respect to the center of the yoke on the surface opposite to the surface of the yoke where the magnet is fixed. The speaker magnetic circuit according to claim 7. The bottom portion of the yoke supported by the engaging portion has a recess formed on a surface opposite to a surface of the yoke on which the magnet is fixed. Magnetic circuit for speakers. The speaker magnetic circuit according to claim 9, wherein the fixing member is made of a high conductivity material. The speaker magnetic circuit according to claim 1, wherein a plate is stacked on the magnet. The speaker magnetic circuit according to claim 1;
A frame that supports the speaker magnetic circuit;
A vibrating body supported by the frame,
The vibration body includes an edge portion, a vibration portion, and a voice coil. An electronic apparatus comprising the speaker device according to claim 12.

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