JP2011239248A - Speaker edge material, speaker edge using the same, speaker diaphragm using this, and speaker, electronic apparatus, apparatus using this - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a conventional foam rubber edge for a speaker is hard to reduce the cost because it has low-productivity, and a thermoplastic elastomer edge is hard to form a shallow portion because it is easily deformed.SOLUTION: Fine particles of mica having an average grain diameter of 40 μm or less and a foaming agent are added to a thermoplastic elastomer to form a speaker edge material. Injection formation of the speaker edge material provides an edge shape thereof to thereby obtain an elastomer edge having a small forming shrinkage ratio. Reduced inner stress by the injection formation and strain-free formation allows the formation of a shallower portion. The speaker edge material, a speaker edge using this material, and a speaker diaphragm using this speaker edge can achieve high quality and high reliability in terms of improved linearity, reduced weight, high internal loss, excellent durability, easy manufacturing with reduced variation, and excellent waterproof performance.

Description

  The present invention relates to an edge material for speakers, an edge for speakers, a diaphragm for speakers, a speaker, an electronic device, and an apparatus used for various kinds of audio equipment and video equipment including in-vehicle use.

  The edge for the speaker supports the outer periphery of the diaphragm and holds it in the correct position, and also moves freely and flexibly following the movement of the diaphragm, and plays a role of braking this against lateral shake. .

  The required performances are good linearity, light weight, high internal loss, excellent durability, easy manufacturing, little variation, and low cost.

  In recent years, waterproofness has become one of the important characteristics, mainly for in-vehicle use.

  Various materials are used as edges to meet these required properties.

  For example, a natural fiber or synthetic fiber woven fabric coated with a relatively soft and high internal loss material such as rubber or acrylic, and further impregnated with a thermosetting resin for hardness control as required There is a cloth edge obtained by thermoforming the material into a predetermined shape.

  This cloth edge is lightweight, has little variation, and is inexpensive. However, in recent automotive applications, waterproofing is required, and since the thermosetting resin is impregnated, the internal loss is reduced and distortion is likely to occur.

  Further, there is a foamed urethane edge obtained by thermoforming a foamed urethane sheet into a predetermined shape.

  This foamed urethane edge has better linearity and better vibration damping than the fabric edge described above, but it has the disadvantages that it is weak in weather resistance, has a large quality variation, and is inferior in reliability. ing.

  In addition, with vulcanized rubber edges, vulcanized rubber is flexible and excellent in vibration control, heat resistance and waterproofing, but it has the disadvantage that it takes a long time to vulcanize and the molding cycle is long. There is a problem that the cost cannot be reduced.

  Furthermore, since the rubber edge is heavy, using it increases the weight of the vibration system, which also reduces the efficiency of the speaker. Therefore, recently, vulcanized foamed rubber edges are also frequently used to reduce the weight of the rubber edge. Has been.

  On the other hand, as an alternative material for this vulcanized rubber, many edges using a thermoplastic elastomer that can be formed into a sheet or injection have been developed.

  For example, Patent Document 1, Patent Document 2, Patent Document 3 and Patent Document 4 are known as prior art document information relating to the invention of this application.

Japanese Patent Laid-Open No. 2003-037889 JP 2001-103595 A JP 2003-78998 A JP-A-7-131888

  As mentioned above, one of the edge materials that maintain a good balance between the requirements required for the edge and high reliability is the foamed rubber edge, but this foamed rubber edge is also molded because it requires vulcanization time in the molding process. Since the cycle is long, the degree of contamination of the mold is severe, and the production energy is high, the production efficiency is not good, and there is a problem that the cost cannot be reduced.

  In mass production, in order to improve productivity and reduce costs, it is necessary to increase the number of molds used in the molding process, resulting in variations in requirements for thin walls and high dimensional accuracy. It had the quality problem of being easy to do.

  The present invention solves the above-mentioned problems, has good linearity required for edge materials, is lightweight, has high internal loss, has excellent durability, is easy to manufacture, has little variation, and has excellent waterproof performance. An object of the present invention is to provide a speaker edge material, a speaker edge, and a speaker diaphragm having high performance.

  In order to achieve the above object, the present invention is an edge material for a speaker for forming a shape by injection molding, and a fine mica having an average particle size of 40 μm or less and a foaming agent are added to a thermoplastic elastomer. The speaker edge material.

  With this configuration, an elastomer with a small molding shrinkage rate can be obtained, the internal stress due to injection molding can be relieved, and molding can be performed without leaving any distortion, so that deformation and warpage of the molded product can be suppressed, and thinner molding can be achieved. Therefore, it is possible to obtain a speaker edge material with high performance, light weight, high internal loss, excellent durability, easy manufacturing, little variation, and excellent waterproof performance.

  As described above, according to the present invention, an elastomer having a small molding shrinkage rate can be obtained, the internal stress due to injection molding can be relieved and molding can be performed without leaving any distortion, so that deformation and warpage of the molded product can be suppressed, and thinner molding can be performed. Therefore, it is possible to provide a speaker edge material with high performance that has good linearity, light weight, high internal loss, excellent durability, easy manufacturing, little variation, and excellent waterproof performance.

  Therefore, this configuration makes it possible to obtain an elastomer edge for speakers with a low molding shrinkage rate, so that the internal stress during integral molding by injection molding can be relaxed and molding can be performed without leaving any distortion, so deformation and warpage of the molded product can be suppressed. , The degree of freedom of the shape is increased and the thin-wall molding can be performed.

  Moreover, since it is injection molding, a dimensional system is high and productivity can be improved.

  In addition, even when a large number of pieces are taken to improve productivity, there is no large molding variation like vulcanized rubber, and mold contamination is reduced.

  In addition, since the runner portion of the molded product can be recycled, it is environmentally friendly, the material utilization rate is improved, and the cost can be reduced.

  Furthermore, the occurrence of rolling can be suppressed, and the quality can be improved and the characteristics can be improved.

External view of speaker edge material according to an embodiment of the present invention Sectional perspective view which shows a part of speaker edge in one embodiment of this invention Sectional drawing of the diaphragm for speakers in one embodiment of this invention Sectional drawing of the speaker in one embodiment of this invention The figure which shows the frequency characteristic of the speaker in one embodiment of this invention The figure which shows the frequency characteristic of the conventional speaker 1 is an external view of an electronic device according to an embodiment of the present invention. Sectional drawing of the apparatus in one embodiment of this invention

  Embodiments of the present invention will be described below.

(Embodiment 1)
Hereinafter, the present invention will be described using the first embodiment.

  FIG. 1 is an external view of a speaker edge material according to an embodiment of the present invention, and FIG. 2 is a cross-sectional perspective view showing a part of the speaker edge according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the speaker diaphragm according to the embodiment of the present invention.

  As shown in FIG. 1, the speaker edge material 29A is composed of fine mica 29a having an average particle size of 40 μm or less, a foaming agent 29b, and a thermoplastic elastomer 29c.

  Here, the mica 29a not only improves the heat resistance of the edge material, but also improves the dimensional stability by suppressing molding shrinkage, and can improve the vibration damping property by increasing the internal loss of the material itself, and improve the accuracy. At the same time, it becomes an edge material capable of obtaining a high-performance edge.

  Further, since oil such as wax contained in the thermoplastic elastomer 29c can be prevented from bleeding out to the surface, high quality and high reliability can be realized.

  The effect of the above-mentioned mica addition is better as the average particle size of mica is smaller. Fine mica of 40 μm or less is desirable.

  The foaming agent 29b has a role of foaming the thermoplastic elastomer 29c to improve weight reduction and internal loss and promote fluidity, and can eliminate short shots and sink marks of the molded product.

  Further, the mica 29a desirably has an average particle diameter of 10 μm or less, and desirably has a smaller particle diameter as it is thin-walled.

  Further, when the average particle diameter of the mica 29a is smaller than 1 μm, the effect can be further exhibited.

  Next, the mixing ratio of mica 29a is preferably 20% by weight or more and 50% by weight or less.

  Here, if the mixing ratio of mica 29a is less than 20% by weight, the effect cannot be exhibited effectively.

  Further, if the mixing ratio of mica 29a exceeds 50% by weight, the flowability of the edge material is lowered and it becomes difficult to form a thin wall, and the elongation of the edge material necessary for the vertical amplitude may not be secured. is there.

  Further, the speaker edge material 29A may include a bamboo material.

  By including the bamboo material, the elastic modulus and internal loss are increased, the sound quality can be improved, and the material strength can be increased at the same time, so that high reliability can be realized.

  Here, the bamboo material may be any of bamboo fiber, bamboo powder, bamboo charcoal powder, or plant opal extracted from bamboo leaves, but it is desirable to use them properly according to the required characteristics.

  Bamboo fiber may be bamboo pulp in the form of pulp, and the elastic modulus can be improved by mixing.

  Here, bamboo fiber simply refers to the entire fiber made of bamboo material, and bamboo or pulp that is obtained by chemically or mechanically loosening bamboo material is called fiber. Also included are suspensions and cardboard.

  Bamboo fiber and bamboo pulp desirably have an average fiber length of 1 mm or less.

  If the average fiber length of bamboo fiber or bamboo pulp is 1 mm or less, it is sufficiently beaten, high dispersibility can be obtained during molding, high productivity can be realized, and sufficient reinforcing effect can be obtained.

  If the average fiber length of bamboo fiber and bamboo pulp is longer than 1 mm, it takes time to disperse the elastomer and the productivity is lowered.

  It is desirable to make bamboo fiber and bamboo pulp finer to a microfibril state with an average fiber diameter of 10 μm or less.

  Bamboo fiber and bamboo pulp can be refined to a microfibril state with an average fiber diameter of 10 μm or less, thereby strengthening the bond with mica 29a, improving the elastic modulus, and improving the tensile strength.

  Furthermore, it is generally known that rubber materials such as elastomers are inversely proportional to the tensile strength and tensile elongation properties, but by adding microfibrillar bamboo fiber or bamboo pulp, the tensile strength of the elastomer is maintained while maintaining the tensile strength. It is possible to improve the tensile properties or improve the tensile strength while maintaining the tensile elongation properties.

  On the other hand, when bamboo fiber and bamboo pulp have an average fiber diameter of 10 μm or more, the force to strengthen the bond with mica 29a tends to be insufficient.

  When the amount of these bamboo fibers increases, the fluidity decreases, and thin wall molding becomes difficult.

  Therefore, in order to increase the bamboo content, bamboo powder may be used in order to give the bamboo supple and tough properties.

  Bamboo powder has better fluidity than bamboo fiber and can therefore increase the amount of bamboo mixed.

  Bamboo charcoal powder may be used, and by carbonizing, the bamboo material itself becomes hard and the elastic modulus and internal loss are improved, so that the sound quality can be further improved.

  In addition, bamboo charcoal powder can achieve a high-quality black-colored appearance without using a colorant, and can improve design.

  Further, plant opal of silicon dioxide component extracted from bamboo leaves may be used.

  Plant opal extracted from bamboo leaves can improve the elastic modulus, and since it is a silicon dioxide compound, it also has good binding properties with mica 29a.

  The plant opal extracted from these bamboo powder, bamboo charcoal powder, and bamboo leaves preferably has an average particle size of 50 μm or less.

  Particularly desirable is an average particle size of 10 μm or more and 50 μm or less.

  When the average particle size is larger than 50 μm, the elastic modulus cannot be improved effectively, and furthermore, high connectivity with the mica 29a cannot be exhibited effectively.

  In addition, when the average particle size is 10 μm or less, the plant opal has a particulate shape, and thus the effect of improving the flexural modulus cannot be exhibited.

  Furthermore, the mixing ratio of the bamboo material is preferably 5% by weight or more and 30% by weight or less.

  If the mixing ratio of the bamboo material is 5% by weight or more and 30% by weight or less, it is possible to effectively improve the sound quality by improving the elastic modulus and the internal loss and further improve the high material strength.

  And when bamboo material is less than 5 weight%, there is too little addition amount and an effect hardly appears.

  Further, when the bamboo material is more than 30% by weight, it becomes difficult to form a thin wall due to a decrease in fluidity, and the degree of freedom in shape is reduced.

  A compatibilizer may also be included.

  The compatibilizing agent can improve the compatibility between the thermoplastic elastomer 29c and the mica 29a, and can further improve performance such as dimensional stability and vibration damping.

  As the hard segment of the thermoplastic elastomer 29c, any of olefin type, styrene type, aramid type and the like may be used.

  Here, the hard segment refers to a hard layer portion of a thermoplastic elastomer.

  Here, the case where the hard segment of the thermoplastic elastomer 29c is an olefin type will be described.

  When a silane compound having a methacryloxy group is used as the compatibilizer, the effect is more exhibited.

  Typical silane compounds having a methacryloxy group include 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, and 3-methacryloxypropyltriethoxysilane.

  In addition, silane compounds having different functional groups such as vinyltrimethoxysilane, vinyltriethoxysilane, 3-mercaptopropylmethyldimethoxysilane, and 3-mercaptopropyltrimethoxysilane may be used.

  If the hard segment of the thermoplastic elastomer 29c is styrene, 3-mercaptopropylmethyldimethoxysilane and 3-mercaptopropyltrimethoxysilane are desirable, but bis (triethoxysilylpropyl) tetrasulfide also exhibits a great effect.

  Even when the hard segment of the thermoplastic elastomer 29c is styrene, it is not limited to the above, but N-2 (aminoethyl) 3-aminopropylmethyldimethoxysilane, N-2 (aminoethyl) 3-aminopropyltrimethoxysilane, N-2 (aminoethyl) 3-aminopropyltriethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane may be used.

  When the hard segment of the thermoplastic elastomer 29C is an aramid type, 2- (3,4 epoxy cyclohexyl) ethyltrimethoxysilane, 3-gridoxypropyltrimethoxysilane, 3-gridoxypropylmethyldiethoxysilane, 3- Gridoxypropyltriethoxysilane, 3-triethoxysilyl-N- (1,3 dimethyl-butylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, etc. are also effective. is there.

  Next, the speaker diaphragm 29 in which the above-described speaker edge material 29A is formed into the speaker edge 29B and the diaphragm main body 27 is coupled will be described.

  The speaker edge 29B is formed by injection molding the above-described speaker edge material 29A.

  By injection molding, production efficiency can be improved, and even complex edge shapes can be molded without causing stress distortion during molding, linearity is good, accuracy is high, Edges with little variation can be easily obtained.

  At this time, the speaker edge 29B may be formed by injection molding of the speaker edge 29B alone, and then combined with the diaphragm main body, or the speaker edge 29B and the diaphragm main body may be integrally formed and combined at the same time. You may do it.

  By integrally molding and joining the speaker edge 29B and the diaphragm main body at the same time, no adhesive is required, and the production efficiency can be further improved.

  Further, the diaphragm main body can be integrally formed of paper or resin, and no adhesive is required.

  When the diaphragm main body is made of paper, the degree of freedom in designing sound quality and frequency characteristics can be expanded.

  On the other hand, when the diaphragm main body is made of resin, water resistance and moisture resistance can be improved, and productivity can also be improved.

  In addition, the diaphragm main body made of paper includes bamboo fibers, so that the clear sound quality that is bright and crisp can be realized by the toughness of the bamboo fibers.

  Furthermore, the bamboo fiber added to the edge material is more rigid and supple than the fiber made of softwood, so that deformation and warping of the diaphragm can be eliminated even if the injection speed is increased when forming the thin wall of the edge.

  On the other hand, the diaphragm main body made of resin is desirably made of polypropylene for weight reduction and heat resistance, and may further include bamboo fiber as a reinforcing material.

  And it is desirable that polypropylene is 50 weight% or more.

  If polypropylene is 50% by weight or more, the affinity between the edge material and the diaphragm main body material is increased, and the bond strength with the edge can be further strengthened.

  Further, the resin of the diaphragm main body may further contain plant-derived polylactic acid.

  The mixing amount of plant-derived polylactic acid is preferably 5% by weight or more and 30% by weight or less.

  Particularly preferably, the content is 25% by weight or more and 30% by weight or less.

  Biomass resin in which the polylactic acid derived from plants exceeds 25% by weight is more environmentally friendly.

  The reason for this is that plant-derived polylactic acid is made from carbon dioxide in the atmosphere, and even if burned, the amount of carbon dioxide in the atmosphere does not increase, leading to global warming prevention. This is because the effect of improving the environment is increased.

  If the plant-derived polylactic acid is less than 5% by weight, the flexural modulus cannot be improved by polylactic acid, and the effect cannot be exhibited.

  As described above, the present invention provides a speaker edge formed by injection molding a speaker edge material formed by adding fine mica having an average particle size of 40 μm or less to a thermoplastic elastomer and a foaming agent. A diaphragm for a speaker is configured by coupling with a diaphragm main body.

  With this configuration, it is not necessary to use an adhesive, and it is possible to provide a speaker diaphragm with high quality and high productivity with high dimensional accuracy and suppressed rolling.

  In addition, in the past, most edge materials have to be bonded with an adhesive when bonded to the diaphragm, and the adhesive is limited by the material of the adherend and the heat resistance, so there is also a sound quality effect. This is not a problem, but it is not necessary to use an adhesive in the present invention, so this problem can be solved.

  Conventionally, there has been a possibility of causing deterioration in properties and quality due to rolling due to variations in the application of the adhesive, but in the present invention, it is not necessary to use an adhesive, so this problem can also be solved.

  Furthermore, in the past, in the case of a resin diaphragm, there was a disadvantage that a lot of man-hours such as a primer application step was required before bonding, but in the present invention it is not necessary to use an adhesive, so this problem Can also be resolved.

  Therefore, the present invention provides an elastomer with a small molding shrinkage rate, relieves internal stress due to injection molding, and can be molded without leaving any distortion, so that deformation and warpage of the molded product can be suppressed, and thinner molding can be achieved. The edge material for a speaker having high performance such as good linearity, light weight, high internal loss, excellent durability, easy manufacture, little variation, and excellent waterproof performance can be obtained.

  The addition of reinforcing materials not only improves reliability such as heat resistance, but also has a role of increasing internal loss, so internal loss is larger than conventional thermoplastic elastomers, resulting in superior characteristics and low productivity. A speaker edge material can be obtained.

  Therefore, this configuration makes it possible to obtain an elastomer edge for speakers with a low molding shrinkage rate, so that the internal stress during integral molding by injection molding can be relaxed and molding can be performed without leaving any distortion, so deformation and warpage of the molded product can be suppressed. , The degree of freedom of the shape is increased and the thin-wall molding can be performed.

  Moreover, since it is injection molding, a dimensional system is high and productivity can be improved.

  In addition, even when a large number of pieces are taken to improve productivity, there is no large molding variation like vulcanized rubber, and mold contamination is reduced.

  In addition, since the runner portion of the molded product can be recycled, it is environmentally friendly, the material utilization rate is improved, and the cost can be reduced.

  In addition, since no adhesive is required to manufacture the diaphragm, it is inexpensive including man-hour reduction, and it is possible to suppress the occurrence of rolling due to variations in adhesive application and misalignment. Since it is high and has a high degree of freedom in shape, it is possible to provide an excellent speaker diaphragm capable of achieving high quality stability, improving characteristics, and increasing the degree of freedom in setting characteristics.

(Embodiment 2)
Hereinafter, the present invention will be described using the second embodiment.

  FIG. 4 shows a cross-sectional view of a speaker according to an embodiment of the present invention.

  As shown in FIG. 4, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to form an inner magnet type magnetic circuit 24.

  A frame 26 is coupled to the yoke 23 of the magnetic circuit 24.

  The outer periphery of the diaphragm main body 27 of the present invention is bonded to the peripheral edge of the frame 26 via an edge 29B.

  One end of the voice coil 28 is coupled to the central portion of the diaphragm body 27 and the opposite end is coupled so as to fit into the magnetic gap 25 of the magnetic circuit 24.

  FIG. 5 shows the frequency characteristics of the speaker of the present invention, and FIG. 6 shows the frequency characteristics of the conventional speaker.

  In the speaker of the present invention, the sound pressure is reduced in the peak dip in the middle and high range, and also in the distortion, and it can be seen that the speaker has more excellent characteristics.

  In the above, the speaker having the inner magnet type magnetic circuit 24 has been described. However, the present invention is not limited to this, and the present invention may be applied to a speaker having an outer magnet type magnetic circuit.

(Embodiment 3)
Hereinafter, the present invention will be described using the third embodiment.

  FIG. 7 shows an external view of an audio minicomponent system which is an electronic apparatus according to an embodiment of the present invention.

  The speaker 30 is incorporated in an enclosure 41 to constitute a speaker system.

  The amplifier 42 includes an amplification circuit for an electric signal input to the speaker system.

  An operation unit 43 such as a player outputs a source input to the amplifier 42.

  As described above, the audio mini-component system 44, which is an electronic device, includes the amplifier 42, the operation unit 43, and the speaker system.

  The amplifier 42, the operation unit 43, and the enclosure 41 are main body units of the mini component system 44.

  That is, the speaker 30 is attached to the main body of the mini component system 44.

  The voice coil of the speaker 30 is supplied with power from the amplifier 42 of the main body and emits sound from the diaphragm.

  With this configuration, it is possible to obtain a mini component system 44 that can produce low-distortion sound and good characteristics that could not be realized in the past, and that can produce characteristics with high accuracy, and can stabilize quality and reliability.

  In addition, although the audio | voice minicomponent system 44 was demonstrated as an application to the apparatus of the speaker 30, it is not limited to this.

  It can also be applied to portable portable audio equipment.

  Furthermore, it can be widely applied and deployed in video equipment such as liquid crystal televisions and plasma display televisions, information communication equipment such as mobile phones, and electronic equipment such as computer-related equipment.

(Embodiment 4)
Hereinafter, the present invention will be described using the fourth embodiment.

  FIG. 8 shows a cross-sectional view of an automobile 50 which is an apparatus according to an embodiment of the present invention.

  As shown in FIG. 8, the automobile 30 is configured by incorporating the speaker 30 of the present invention into a rear tray or a front panel and using it as a part of car navigation or car audio.

  By adopting this configuration, a device such as an automobile that has the speaker 30 mounted thereon and can achieve low-distortion sound and good characteristics that take advantage of the characteristics of the speaker 30, and further stabilize the quality and reliability. Can be realized.

  INDUSTRIAL APPLICABILITY The present invention is useful for a speaker that requires low distortion sound and good characteristics, as well as stabilization of quality and reliability and high productivity.

21 magnet 22 upper plate 23 yoke 24 magnetic circuit 25 magnetic gap 26 frame 27 diaphragm main body 28 voice coil 29 diaphragm 29A edge material 29B edge 29a mica 29b foaming agent 29c elastomer 30 speaker 41 enclosure 42 amplifier 43 operation part 44 mini component system 50 Car

Claims (23)

A speaker edge material for forming a shape by injection molding, wherein the speaker edge material comprises a thermoplastic elastomer added with fine mica having an average particle size of 40 μm or less and a foaming agent. For edge material. The speaker edge material according to claim 1, wherein the mica has an average particle size of 10 μm or less. The speaker edge material according to claim 1, wherein the mica has an average particle diameter of 1 μm or less. The speaker edge material according to claim 1, wherein the mixing ratio of mica is 20 wt% or more and 50 wt% or less. The speaker edge material according to claim 1, further comprising a bamboo material. The speaker edge material according to claim 5, wherein the mixing ratio of the bamboo material is 5 wt% or more and 30 wt% or less. The speaker edge material according to claim 5, wherein the bamboo material is at least one of bamboo fiber and bamboo pulp. The edge material for speaker according to claim 7, wherein the bamboo fiber and bamboo pulp have an average fiber length of 1 mm or less. The edge material for loudspeakers according to claim 7, wherein the bamboo fiber and bamboo pulp are made fine to a microfibril state with an average fiber diameter of 10 µm or less. 6. The speaker edge material according to claim 5, wherein the bamboo material is at least one of bamboo powder, bamboo charcoal powder, and plant opal of a silicon dioxide component extracted from bamboo leaves. The edge material for speakers according to claim 10, wherein the plant opal of the silicon dioxide component extracted from bamboo powder, bamboo charcoal powder, and bamboo leaves has an average particle size of 10 µm or more and 50 µm or less. The speaker edge material according to claim 1, further comprising a compatibilizer. The edge material for a speaker according to claim 12, wherein the compatibilizing agent is a silane compound having a methacryloxy group. A speaker edge formed by injection molding the speaker edge material according to any one of claims 1 to 13. The speaker diaphragm which combined the edge for speakers of Claim 14, and the diaphragm main body. The speaker diaphragm according to claim 15, wherein the speaker edge and the diaphragm main body are integrally formed at the same time. The speaker diaphragm according to claim 15, wherein the diaphragm body is made of a material made of paper or resin. The speaker diaphragm according to claim 17, wherein the diaphragm made of paper includes bamboo fiber. The diaphragm for a speaker according to claim 17, wherein the diaphragm made of resin contains 50% by weight or more of polypropylene and bamboo material as a reinforcing material. 18. The speaker diaphragm according to claim 17, wherein the resin diaphragm includes 50% by weight or more of polypropylene and 5% by weight or more and 30% by weight or less of a plant-derived polylactic acid resin. A magnetic circuit, a frame coupled to the magnetic circuit, a loudspeaker diaphragm according to claim 15 coupled to an outer periphery of the frame, and a part of the diaphragm coupled to the loudspeaker diaphragm. A speaker comprising: a voice coil disposed within a range of action of magnetic flux generated from a magnetic circuit. An electronic device equipped with the speaker according to claim 21. An apparatus comprising the speaker according to claim 21 as a moving means.

Images