WO2010004717A1 - スピーカ用振動板、スピーカ、スピーカを用いた電子機器および移動装置 - Google Patents
スピーカ用振動板、スピーカ、スピーカを用いた電子機器および移動装置 Download PDFInfo
- Publication number
- WO2010004717A1 WO2010004717A1 PCT/JP2009/003121 JP2009003121W WO2010004717A1 WO 2010004717 A1 WO2010004717 A1 WO 2010004717A1 JP 2009003121 W JP2009003121 W JP 2009003121W WO 2010004717 A1 WO2010004717 A1 WO 2010004717A1
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- WIPO (PCT)
- Prior art keywords
- speaker
- diaphragm
- bamboo fiber
- polylactic acid
- binder
- Prior art date
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3418—Loud speakers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
- C08L3/02—Starch; Degradation products thereof, e.g. dextrin
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
- H04R2231/001—Moulding aspects of diaphragm or surround
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/021—Diaphragms comprising cellulose-like materials, e.g. wood, paper, linen
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/025—Diaphragms comprising polymeric materials
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/029—Diaphragms comprising fibres
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
Definitions
- the present invention relates to a speaker diaphragm used in various audio equipment and video equipment, a speaker using the same, an electronic device such as an audio set and a television set, and a moving device.
- polylactic acid which is a plant-derived resin
- the speed of sound C (m / s) is often used as a material characteristic required for the diaphragm of a speaker.
- Patent Literature 1 is known as literature information of these prior arts.
- the speaker diaphragm of the present invention is formed by injection molding a material in which polylactic acid, bamboo fiber, and a natural binder are combined.
- the speaker of the present invention includes a magnetic circuit, a frame, a diaphragm, and a voice coil, and the diaphragm is composed of polylactic acid, bamboo fiber, and a natural binder.
- the above configuration improves the compatibility between polylactic acid and bamboo fiber, facilitates bonding, and increases rigidity. As a result, it is possible to obtain a loudspeaker diaphragm having a practically sufficient sound speed and to reduce the environmental load.
- FIG. 1 is a cross-sectional view of a speaker diaphragm according to Embodiment 1 of the present invention.
- FIG. 2 is a plan view of the speaker diaphragm in the first exemplary embodiment of the present invention.
- FIG. 3 is an enlarged cross-sectional view of the speaker diaphragm according to Embodiment 1 of the present invention.
- FIG. 4 is a cross-sectional view of the speaker according to Embodiment 2 of the present invention.
- FIG. 5 is an external view of an audio electronic device according to Embodiment 3 of the present invention.
- FIG. 6 is a cross-sectional view of the moving device according to Embodiment 4 of the present invention.
- FIG. 1 is a cross-sectional view of a speaker diaphragm according to Embodiment 1 of the present invention.
- FIG. 2 is a plan view of the speaker diaphragm in the first exemplary embodiment of the present invention.
- FIG. 3 is an enlarged cross-sectional view of the speaker diaphragm according to Embodiment 1 of the present invention.
- the diaphragm 1 uses polylactic acid 1A as a base resin.
- the diaphragm 1 is configured by injection molding a material in which bamboo fibers 1B and a binder 1C are uniformly dispersed in the polylactic acid 1A.
- Polylactic acid 1A is composed of plant materials. Specifically, it is composed of a polymer synthesized by polymerizing L-lactic acid obtained by fermenting starch extracted from plants such as corn, potatoes, beets and sugarcane as a monomer. Polylactic acid 1A has a high flexural modulus, but is characterized by low impact resistance and heat resistance.
- the first reason for using bamboo fiber 1B is that it is hard and supple, and therefore has an effect of improving the elastic modulus and an effect of improving internal loss.
- bamboo fiber 1B has a large deodorizing effect and has no odor peculiar to plant fibers, so that it can be used in a wide range of in-vehicle speakers and indoor audio sets.
- the third reason for using bamboo fiber 1B is not only the effect of adjusting the physical properties to improve sound quality, but also the vegetation is increased and the environmental load can be reduced.
- the term “vegetability” as used herein refers to the weight percent of a material made of plant raw material, and is the total weight percent of polylactic acid 1A, bamboo fiber 1B and binder 1C contained in diaphragm 1.
- the fiber length of bamboo fiber 1B is preferably 0.2 mm or more and 5 mm or less.
- the fiber length of the bamboo fiber 1B is shorter than 0.2 mm, the effect of the bamboo fiber 1B cannot be obtained efficiently and the high elastic modulus is lowered.
- the fiber length of the bamboo fiber 1B is longer than 5 mm, the appearance is impaired when the diaphragm 1 is thinned. Therefore, in order to obtain a high-performance and high-quality diaphragm 1, it is preferable to select a bamboo fiber 1B having a fiber length of 0.2 mm or more and 5 mm or less.
- the weight of the bamboo fiber 1B in the total weight of the diaphragm 1 is preferably 5% by weight or more and 55% by weight or less, more preferably 10% by weight or more and 30% by weight or less.
- the weight of the bamboo fiber 1B is smaller than 5% by weight of the total weight of the diaphragm 1, the above-described effect by using the bamboo fiber 1B does not appear remarkably. Further, when the weight of the bamboo fiber 1B is greater than 55% by weight of the total weight of the diaphragm 1, it is difficult to uniformly disperse the bamboo fiber 1B in the polylactic acid 1A that is the base resin.
- the weight of the bamboo fiber 1B is 30% by weight or more of the total weight of the diaphragm 1
- the fluidity of the polylactic acid 1A as the base resin is low, so that the diaphragm having a surface thickness of 0.3 mm or less by injection molding. It becomes difficult to obtain 1.
- the bamboo fiber 1B further includes bamboo fiber refined to a microfibril state with an average fiber diameter of 10 ⁇ m or less.
- bamboo fiber 1B refined to the microfibril state is included in diaphragm 1, the entanglement of bamboo fiber 1B becomes stronger, and the strength is improved. Therefore, the elastic modulus is also improved, and higher sound quality can be realized.
- a fiber having a large aspect ratio (L / D), which is a ratio between the fiber length L and the fiber diameter D, is highly elastic, and the bamboo fiber 1B that has been refined to a microfibril state has a large aspect ratio, so a high elastic modulus can be expected.
- L / D which is a ratio between the fiber length L and the fiber diameter D
- the bamboo fiber 1B that has been refined to a microfibril state has a large aspect ratio, so a high elastic modulus can be expected.
- the bamboo fiber 1B partially refined to a microfibril state is included in the diaphragm 1, there is an effect that the bond between the fibers of the bamboo fiber 1B is strengthened, and these are synergistically highly elastic. Become a rate.
- bamboo powder may be used for a part or all of the bamboo fiber 1B.
- the disadvantages described above when the weight of the bamboo fiber 1B contained in the diaphragm 1 exceeds 30% by weight is reduced by using bamboo powder.
- the total weight of bamboo fiber 1B and bamboo powder which are not powdery is 55% by weight or less of the total weight of diaphragm 1, diaphragm 1 can be easily injection molded.
- the plant degree here refers to the total weight percent of plant raw material resin made from corn and other plant fibers such as bamboo fiber 1B, and how much carbon dioxide, a greenhouse gas without using petroleum-derived materials, is emitted. This is one measure of whether or not it can be reduced.
- the elastic modulus can be further improved by adding a carbonized material.
- a carbonized material In particular, when bamboo charcoal is used, the elastic modulus can be increased without lowering the plantiness.
- bamboo charcoal usually serves as a carbon pigment used in the black-colored diaphragm 1 and can not only improve sound quality but also have a high-quality appearance.
- bamboo charcoal refers to a granular material that is crushed after bamboo material is cut to an appropriate size and carbonized at a high temperature of about 800 ° C.
- the binder 1C is composed of a natural binder.
- a natural binder is a binder manufactured from a raw material of natural origin, and is a binder that is biodegradable and does not burden the environment when buried in the ground.
- the reason why the natural binder is used is the same natural material as the polylactic acid 1A and bamboo fiber 1B of the plant material that is the adherend, so the affinity, dispersibility and phase with the polylactic acid 1A and bamboo fiber 1B are the same. This is because the solubility is good. For this reason, interaction can be expected at the time of bonding between the polylactic acid 1A and the bamboo fiber 1B, and a strong adhesive force can be obtained. Therefore, the natural binder has excellent fixability to the bamboo fiber 1B.
- starch-based binders are suitable as the binder 1C used in this embodiment.
- the starch-based binder is a granular, powdery material and has thermoplasticity.
- the glass transition temperature of the starch-based binder is 85 ° C to 130 ° C.
- the starch-based binder means a binder composed of raw starch, chemically modified starch, and physically modified starch.
- the starch is composed of at least one of potato, corn, wheat, tapioca and the like.
- the starch-based binder constituting the binder 1C is at least one of oxidized starch, cationized starch, phosphate esterified starch, etherified starch, potato starch, tapioca starch, wheat starch, and corn starch. Consists of.
- the weight of the starch binder 1C with respect to the total weight of the diaphragm 1 is preferably 0.5% by weight or more and 20% by weight or less. If the weight of the starch-based binder 1C is less than 0.5% by weight, it is difficult to adhere to the polylactic acid 1A or the bamboo fiber 1B even if the starch-based binder 1C is used. Further, when the weight of the starch-based binder 1C is greater than 20% by weight, a solidified and hardened portion is generated, and thus the mixture with the polylactic acid 1A and the bamboo fiber 1B is not uniformly dispersed.
- Polylactic acid 1A, bamboo fiber 1B and binder 1C are blended at a blending ratio of 80% by weight of polylactic acid 1A, 15% by weight of bamboo fiber 1B, and 5% by weight of starch-based binder 1C. Is melt-kneaded to produce resin pellets.
- the resin pellets are injection molded at a molding temperature of 200 ° C. to obtain a diaphragm 1 for a speaker having a 16 cm diameter.
- the specific gravity of the diaphragm 1 is measured, the specific gravity is about 1.15.
- the sound speed is measured by extracting a sample having a size of 32 mm ⁇ 5 mm which is a part of the diaphragm 1, the sound speed is about 2000 m / s.
- the content of bamboo fiber 1B is 10 to 30% by weight
- the starch binder is 1 to 10% by weight
- the content of polylactic acid 1A is the remaining blending ratio.
- the remaining blending ratio is in the range of 60 wt% to 89 wt%
- the total weight% is 100 wt%
- the weight% is the content of bamboo fiber 1B
- the weight is the content of binder 1C.
- the specific gravity of the diaphragm 1 is in the range of 1.10 or more and 1.18 or less
- the sound speed of the diaphragm 1 is 1800 m / s or more, which is a practically sufficient sound speed.
- a loudspeaker diaphragm 1 including a petroleum-derived polypropylene and capable of obtaining a sufficient sound speed with polypropylene is shown as a comparative example.
- the polylactic acid 1A content is 25% by weight
- the bamboo fiber 1B content is 25% by weight
- the starch binder 1C content is 5% by weight
- the polypropylene content is 45% by weight. Kneading to produce resin pellets.
- the resin pellets are injection molded at a molding temperature of 200 ° C. to obtain a diaphragm 1 for a speaker having a 16 cm diameter.
- the specific gravity of the diaphragm 1 is measured, the specific gravity is about 1.16.
- a sound speed is measured by extracting a sample having a size of 32 mm ⁇ 5 mm, which is a part of the diaphragm 1, the sound speed is about 1900 m / s.
- the diaphragm 1 of the example has a high plant degree and reduces the environmental load, and is substantially equivalent to the diaphragm 1 derived from petroleum of the comparative example and exhibits a sufficient sound speed of 1800 m / s or more.
- a diaphragm for a speaker is formed by injection molding a composite material of polylactic acid, which is a plant material, bamboo fiber, and a natural binder.
- polylactic acid which is a plant material, bamboo fiber, and a natural binder.
- FIG. 4 is a cross-sectional view of the speaker according to Embodiment 2 of the present invention. Note that the description of the same configuration as that of Embodiment 1 is omitted.
- a magnetized magnet 2 is sandwiched between an upper plate 3 and a yoke 4 to form an inner magnet type magnetic circuit 5.
- a frame 7 is coupled to the yoke 4 of the magnetic circuit 5.
- the outer periphery of the diaphragm 1 is bonded to the peripheral edge of the frame 7 via an edge 9.
- the diaphragm 1 is composed of polylactic acid, bamboo fiber, and a natural binder.
- one end of the voice coil 8 is coupled to the central portion of the diaphragm 1 and the other end is coupled so as to fit into the magnetic gap 6 of the magnetic circuit 5 to constitute a speaker.
- the speaker having the inner magnetic type magnetic circuit 5 has been described.
- the present invention is not limited to this and may be applied to a speaker having an outer magnetic type magnetic circuit.
- FIG. 5 is an external view of an audio electronic device according to Embodiment 3 of the present invention. Note that a description of the same configurations as those of the above-described embodiments is omitted.
- the speaker 10 is incorporated in the enclosure 11 to constitute a speaker system 21.
- the diaphragm 1 of the speaker 10 is composed of polylactic acid, bamboo fiber, and a natural binder.
- the amplifier 12 includes an amplification circuit for an electric signal input to the speaker system 21.
- An operation unit 13 such as a player outputs a source input to the amplifier 12.
- the audio electronic device 14 includes an amplifier 12, an operation unit 13, and a speaker system 21.
- the amplifier 12, the operation unit 13, and the enclosure 11 are the main body of the audio electronic device 14. That is, the speaker 10 is attached to the main body of the audio electronic device 14.
- the voice coil 8 of the speaker 10 is driven by the amplifier 12 of the main body, and the diaphragm 1 emits sound. With this configuration, it is possible to obtain an electronic device for audio 14 that has a low environmental load that could not be realized in the past, and that enables high quality with high sound quality.
- the audio electronic device 14 that is stationary is described, but the present invention is not limited to this. It can also be applied to portable portable audio devices and game devices. 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.
- FIG. 6 is a cross-sectional view of the moving device according to the fourth embodiment of the present invention.
- the mobile device in FIG. 6 uses a car as a specific example. Note that a description of the same configurations as those of the above-described embodiments is omitted.
- a vehicle 15 is configured in which the speaker 10 is incorporated in a rear tray or a front panel and used as a part of car navigation or car audio sound output.
- the diaphragm 1 of the speaker 10 is composed of polylactic acid, bamboo fiber, and a natural binder.
- the car navigation outputs information related to the traveling of the automobile 15 from the speaker 10.
- the car audio outputs an audio signal from the speaker 10.
- the automobile 15 is described as an example of the moving device.
- the present invention can be widely applied to a moving device including at least a moving means and incorporating a speaker 10 such as a motorcycle such as a motorcycle and a train running on a rail.
- a moving device including at least a moving means and incorporating a speaker 10 such as a motorcycle such as a motorcycle and a train running on a rail.
- a speaker 10 such as a motorcycle such as a motorcycle and a train running on a rail.
- the example which formed the diaphragm for speakers of this invention by injection molding was demonstrated, it is not limited to this, It can implement also by other methods, such as press molding.
- the speaker diaphragm, the speaker, the electronic device, and the moving device of the present invention can be applied to an electronic device such as an audiovisual device or an information communication device that requires a high sound quality speaker and further to a moving device such as an automobile. Applicable.
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Abstract
Description
図1は本発明の実施の形態1におけるスピーカ用振動板の断面図である。図2は本発明の実施の形態1におけるスピーカ用振動板の平面図である。図3は本発明の実施の形態1におけるスピーカ用振動板の断面拡大図である。
ポリ乳酸1Aの含有量を80重量%、竹繊維1Bの含有量を15重量%、デンプン系のバインダ1Cの含有量を5重量%の配合比率で、ポリ乳酸1Aと竹繊維1Bとバインダ1Cとを溶融混練して樹脂ペレットを作製する。樹脂ペレットを200℃の成形温度で射出成形し、16cm口径のスピーカ用の振動板1を得る。この振動板1の比重を測定すると、比重は約1.15である。また、振動板1の一部である32mm×5mmの大きさの試料を抽出して音速を測定すると、音速は約2000m/sである。
石油由来のポリプロピレンを含み、ポリプロピレンによって十分な音速が得られるスピーカ用の振動板1を比較例として示す。
以下、本発明の実施の形態2のスピーカについて、図4を用いて説明する。図4は、本発明の実施の形態2におけるスピーカの断面図である。なお、実施の形態1と同様の構成については説明を省略する。
以下、本発明の実施の形態3の電子機器について、図5を用いて説明する。図5は、本発明の実施の形態3におけるオーディオ用の電子機器の外観図である。なお、前述した各実施の形態と同様の構成については説明を省略する。
以下、実施の形態4の移動装置について、図6を用いて説明する。図6は本発明の実施の形態4における移動装置の断面図である。図6の移動装置は、具体的な一例として自動車を用いている。なお、前述した各実施の形態と同様の構成については説明を省略する。
1A ポリ乳酸
1B 竹繊維
1C バインダ
2 マグネット
3 上部プレート
4 ヨーク
5 磁気回路
6 磁気ギャップ
7 フレーム
8 ボイスコイル
9 エッジ
10 スピーカ
11 エンクロジャー
12 アンプ
13 操作部
14 オーディオ用の電子機器
15 自動車
Claims (16)
- 少なくともポリ乳酸と、竹繊維と、天然系のバインダとからなるスピーカ用振動板。
- 前記ポリ乳酸と、前記竹繊維と、前記天然系のバインダとを複合化し、射出成形した請求項1に記載のスピーカ用振動板。
- 前記天然系のバインダは、デンプン系のバインダである
請求項1に記載のスピーカ用振動板。 - 前記竹繊維の含有量を10~30重量%、前記デンプン系のバインダの含有量を1~10重量%、前記ポリ乳酸の含有量を残りの重量%とした
請求項3に記載のスピーカ用振動板。 - 前記竹繊維は、ミクロフィブリル状態まで微細化された
請求項1に記載のスピーカ用振動板。 - 前記ポリ乳酸と、前記竹繊維と、前記天然系のバインダとが均一に分散された
請求項1に記載のスピーカ用振動板。 - 比重が1.10以上1.18以下である
請求項1に記載のスピーカ用振動板。 - 磁気回路と、
前記磁気回路に結合されたフレームと、
前記フレームの外周部に結合された振動板と、
前記振動板に結合され、前記磁気回路の磁気ギャップに配置されたボイスコイルとを備えたスピーカであって、
前記振動板は、少なくともポリ乳酸と、竹繊維と、天然系のバインダとからなる
スピーカ。 - 前記ポリ乳酸と、前記竹繊維と、前記天然系のバインダとを複合化し、射出成形した振動板を備えた請求項8に記載のスピーカ。
- 前記天然系のバインダは、デンプン系のバインダである
請求項8に記載のスピーカ。 - 前記竹繊維の含有量を10~30重量%、前記デンプン系のバインダの含有量を1~10重量%、前記ポリ乳酸の含有量を残りの重量%とした
請求項10に記載のスピーカ。 - 前記竹繊維は、ミクロフィブリル状態まで微細化された
請求項8に記載のスピーカ。 - 前記ポリ乳酸と、前記竹繊維と、前記天然系のバインダとは均一に分散された
請求項8に記載のスピーカ。 - 前記振動板の比重が1.10以上1.18以下である
請求項8に記載のスピーカ。 - スピーカと、前記スピーカを駆動する増幅回路とを備えた電子機器であって、
前記スピーカは、磁気回路と、前記磁気回路に結合されたフレームと、前記フレームの外周部に結合された振動板と、前記振動板に結合され前記磁気回路の磁気ギャップに配置されたボイスコイルとを有し、
前記振動板は、少なくともポリ乳酸と、竹繊維と、天然系のバインダとから構成された
電子機器。 - スピーカと、前記スピーカを駆動する増幅回路と、移動手段とを備えた移動装置であって、
前記スピーカは、磁気回路と、前記磁気回路に結合されたフレームと、前記フレームの外周部に結合された振動板と、前記振動板に結合され前記磁気回路の磁気ギャップに配置されたボイスコイルとを有し、
前記振動板は、少なくともポリ乳酸と、竹繊維と、天然系のバインダとから構成された
移動装置。
Priority Applications (2)
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US12/866,928 US9008349B2 (en) | 2008-07-07 | 2009-07-06 | Speaker diaphragm, speaker, and electronic equipment and mobile device using the speaker |
CN200980110503.1A CN101981947B (zh) | 2008-07-07 | 2009-07-06 | 扬声器用振动膜、扬声器、使用了扬声器的电子设备及移动装置 |
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JP2008-176545 | 2008-07-07 | ||
JP2008176545A JP5470761B2 (ja) | 2008-07-07 | 2008-07-07 | スピーカ用振動板およびこれを用いたスピーカならびにこのスピーカを用いた電子機器および装置と、前記スピーカ用振動板の製造方法 |
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WO2010004717A1 true WO2010004717A1 (ja) | 2010-01-14 |
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PCT/JP2009/003121 WO2010004717A1 (ja) | 2008-07-07 | 2009-07-06 | スピーカ用振動板、スピーカ、スピーカを用いた電子機器および移動装置 |
Country Status (4)
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US (1) | US9008349B2 (ja) |
JP (1) | JP5470761B2 (ja) |
CN (1) | CN101981947B (ja) |
WO (1) | WO2010004717A1 (ja) |
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CN105453589A (zh) * | 2013-08-01 | 2016-03-30 | 松下知识产权经营株式会社 | 扬声器用振动板、扬声器、以及电子设备、移动体装置 |
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Publication number | Publication date |
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US9008349B2 (en) | 2015-04-14 |
CN101981947B (zh) | 2015-05-13 |
JP5470761B2 (ja) | 2014-04-16 |
US20110007922A1 (en) | 2011-01-13 |
CN101981947A (zh) | 2011-02-23 |
JP2010016736A (ja) | 2010-01-21 |
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