WO2012137369A1 - マイクロスピーカ用振動板エッジ材、マイクロスピーカ用振動板、マイクロスピーカ、および電子機器 - Google Patents
マイクロスピーカ用振動板エッジ材、マイクロスピーカ用振動板、マイクロスピーカ、および電子機器 Download PDFInfo
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- WO2012137369A1 WO2012137369A1 PCT/JP2011/069940 JP2011069940W WO2012137369A1 WO 2012137369 A1 WO2012137369 A1 WO 2012137369A1 JP 2011069940 W JP2011069940 W JP 2011069940W WO 2012137369 A1 WO2012137369 A1 WO 2012137369A1
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- diaphragm
- speaker
- edge material
- micro speaker
- micro
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
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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
- H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
- H04R7/125—Non-planar diaphragms or cones comprising a plurality of sections or layers comprising a plurality of superposed layers in contact
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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
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
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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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
Definitions
- the present invention relates to a diaphragm edge material technology of a micro speaker for an electro-acoustic converter used in an electronic device such as a mobile phone, a portable audio device, or a laptop computer, and in particular, heat resistance, cold resistance, moisture resistance.
- Microspeaker diaphragm edge material excellent in moldability, high internal loss, etc. microspeaker diaphragm using the microspeaker diaphragm edge material, microspeaker, and mobile phone using the microspeaker
- the present invention relates to portable acoustic devices or electronic devices such as notebook computers.
- edge materials that also serve as diaphragms for microspeakers used in small electronic devices such as mobile phones as described above are polyimide (PI), polyamide imide (PAI), polyphenylene sulfide (PPS).
- PI polyimide
- PAI polyamide imide
- PPS polyphenylene sulfide
- PES polyphenylene sulfide Resin
- PEI Polyetherimide
- PEN Polyethylene Naphthalate
- PET Polyethylene Terephthalate
- PEEK Polyether Ether Ketone
- PEEK Poly Ether Ether Ketone
- a general speaker diaphragm also referred to as cone paper
- a vibrating body outside One-piece molded products that are inseparably responsible for both functions of the edge portion located around the circumference are the mainstream.
- a speaker diaphragm in which a resin film such as polyimide (PI) or polyamideimide (PAI) is integrally formed in a dome shape is disclosed in, for example, Japanese Patent Application Laid-Open No. 2003-289594 “Speaker diaphragm, polyamide resin and polyimide resin used therefor” (Patent Document 1).
- PI polyimide
- PAI polyamideimide
- FIG. 6, 7, and 8 are a perspective view of a mobile phone disclosed in Patent Document 1, a configuration example of a diaphragm, and a structural diagram of a speaker.
- FIG. 6 1 is a mobile phone, 2 (4) is a speaker unit, and 3 is a microphone unit (receiver speaker).
- FIG. 7 shows an overall view of a diaphragm molded from a polyamideimide (PAI) resin film (or polyimide (PI) resin film).
- PAI polyamideimide
- PI polyimide
- 3 is a diaphragm
- 3a is a dome part (body) of the diaphragm
- 3b is a recessed fitting part of the diaphragm
- 3c is a peripheral part (edge) of the diaphragm
- 3d is an external pasting part of the diaphragm
- FIG. 8 is a diagram showing the structure of the speaker unit incorporating the diaphragm 3 shown in FIG.
- 3 is a diaphragm
- 3a is a dome part (body) of the diaphragm
- 3b is a recessed fitting part of the diaphragm
- 3c is a peripheral part (edge) of the diaphragm
- 3d is an external pasting part of the diaphragm
- 5 is a voice coil
- 7a is an upper magnetic pole plate of the speaker
- 7b is a lower magnetic pole plate of the speaker
- 8 is a magnetic gap
- 9 is an external terminal of the speaker
- Reference numeral 10 denotes a gasket
- 14 denotes a speaker magnet
- 15 denotes a speaker magnetic circuit
- 17 denotes a frame
- 26 denotes a protector.
- thin film engineering plastics such as polyamideimide (PAI) (or polyimide (PI)) are used as the diaphragm to reduce the weight and weight of the diaphragm.
- PAI polyamideimide
- PI polyimide
- the required sensitivity tends to be limited, for example, the lower limit frequency is insufficient and the sound quality becomes stiff.
- a material with high Young's modulus hardness is suitable for reproducing sound that is accurately transmitted in the air without leaving excessive vibrations of each frequency mainly transmitted from the voice coil. ing.
- the edge part is positioned on the outer periphery of the vibration part body and is fixed to the frame. Therefore, the edge part mainly has a large internal loss that absorbs vibrations from the diaphragm efficiently and quickly, and a flexible damper function such as rubber. Material is suitable.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2004-312085 “Speaker diaphragm and speaker using the same” (Patent Document 2) describes a minimum diaphragm frequency (Fo) in a speaker diaphragm. ), An elastomer layer is provided on one or both sides of a polyimide resin substrate for the purpose of wide frequency characteristics and high sound quality, and Japanese Patent No. 3996075 “Speaker diaphragm film” ( Patent Document 3) discloses one in which a resin coating layer is provided on one side or both sides of a polyetherimide film substrate.
- An important role of the edge material of the diaphragm for a micro speaker is to suppress the divided vibration from the diaphragm and stabilize the frequency characteristics. Therefore, a function for efficiently attenuating dynamic vibration is required. In addition, a characteristic of high Young's modulus is also required in order to transmit vibration from the coil.
- general-purpose materials such as PAI, PI, and PEI disclosed in each patent document have durability against high heat and strong vibration transmitted from the voice coil as the speaker power increases and the sound quality increases. It was not sufficient, and there were problems such as tearing and breakage over time.
- the object of the present invention is a diaphragm edge material for a micro speaker that is particularly excellent in heat resistance, cold resistance, moisture resistance, moldability, bending resistance, vibration resistance, high internal loss, etc.
- the diaphragm edge material for a micro speaker according to the present invention has a polyether etherketone (PEEK) on one surface of an intermediate layer having a high damping effect, and a polyetheretherketone (PEEK) on the other surface.
- PEEK polyether etherketone
- PEEK polyetheretherketone
- PEEK polyetherimide
- the constraining layer on both sides of the intermediate layer is PEEK, and the thickness of the constraining layer is in the range of 2.0 ⁇ m to 20.0 ⁇ m.
- the thickness of the intermediate layer is also in the range of 5.0 ⁇ m to 50.0 ⁇ m.
- the intermediate layer is also characterized by comprising an acrylic or butyl low hardness agent.
- the hardness of the intermediate layer is characterized by being Shore A60 or less.
- a diaphragm for a microspeaker according to the present invention is characterized by using the above-described diaphragm edge material for a microspeaker.
- a diaphragm dome (body part) formed of a highly elastic material
- a peripheral edge portion (edge portion) of a diaphragm formed by the ring-shaped microspeaker diaphragm edge material of the ring shape and an outer peripheral portion of the high elastic material and the ring-shaped microspeaker diaphragm edge material of the microspeaker
- the inner peripheral part is integrated in a superimposed positional relationship, or the highly elastic material that forms the dome part (body part) of the diaphragm, and the dome part (body part) and peripheral part (edge part) of the diaphragm
- the micro speaker according to the present invention is characterized by using the above diaphragm for a micro speaker, and the electronic device according to the present invention is characterized by incorporating the micro speaker.
- the diaphragm edge material for a microspeaker of the present invention is excellent in heat resistance, cold resistance, moisture resistance, moldability, bending resistance, vibration resistance, high internal loss, etc. by adopting the above configuration.
- this micro speaker diaphragm edge material into a micro speaker diaphragm or a micro speaker, or by incorporating the micro speaker into an electronic device such as a mobile phone, a portable audio device, or a notebook computer, An excellent diaphragm for a micro speaker, a micro speaker, and an electronic device can be realized.
- FIG. 5 is a structural diagram of a micro speaker using the diaphragm edge material for the micro speaker of FIG. 4. It is a perspective view of the mobile phone in a prior art. It is a figure which shows the diaphragm in a prior art. It is a structural diagram of a speaker in the prior art. It is a graph which shows the relationship between the thickness of a constrained layer, and the minimum frequency.
- the diaphragm edge material for microspeakers needs to dissipate energy as much as possible during one period of dynamic vibration not only in terms of improving the breaking strength under high heat resistance, but also in terms of acoustic characteristics.
- the diaphragm edge material is characterized in that an adhesive layer having a high damping effect is used as an appropriate material that efficiently disperses and attenuates, and constraining layers are provided on both surfaces. This method is called constrained layer damping treatment, and requires a sufficiently high physical property of the constraining layer for an adhesive layer having a high damping effect.
- the intermediate adhesive layer (damping layer) and the two surface constraining layers are deformed independently of each other, and the damping layer is subjected to a large shear strain.
- the damping effect per unit weight of the damping material is much larger than the unconstrained layer damping effect, and a large damping effect can be obtained with the addition of a thin damping layer, so it is suitable for micro speaker diaphragm edge materials that require lightweight high power Is preferred.
- an acrylic or butyl adhesive having a low hardness is used for the intermediate damping layer, and a polyetheretherketone (PEEK) having high rigidity, heat resistance, and bending resistance is used for both surface constraining layers.
- PEEK polyetheretherketone
- Environmentally friendly [RoHS Directive Restriction 6 Substances (Lead, Cadmium, Mercury, Hexavalent Chromium, PBB, PBDE) not contained]
- a diaphragm edge material for a microspeaker having a high Young's modulus is obtained, and is particularly suitable when applied to a speaker of an electronic device such as a mobile phone, a portable acoustic device, or a notebook computer.
- Example 1 A diaphragm edge material for a micro speaker according to the present invention will be described.
- a diaphragm edge material 30 for a microspeaker according to the present invention includes a constrained layer (thickness) made of PEEK from both sides of an intermediate layer (thickness 5 ⁇ m to 50 ⁇ m) 31 made of acrylic or butyl low hardness agent. (2 ⁇ m to 20 ⁇ m) 32, 33.
- FIG. 9A is a graph showing the relationship between the thickness of the constraining layers 32 and 33 and the minimum frequency of the microspeaker.
- the horizontal axis of the graph is the lowest value (hereinafter referred to as the lowest frequency (Hz)) of the frequency output from the microspeaker using the above-described microspeaker diaphragm edge material 30, and the vertical axis is the constraining layer 32,
- the PEEK as 33 has a single thickness ( ⁇ m).
- the minimum frequency is set to 2.0 ⁇ m, 3.5 ⁇ m, 5.0 ⁇ m, 7.0 ⁇ m, 10.0 ⁇ m, 15.0 ⁇ m, and 20.0 ⁇ m for the thicknesses of the constraining layers 32 and 33, respectively. It was measured.
- the minimum frequency increases as the thickness of the constraining layers 32 and 33 increases and depends on the thickness change of the constraining layers 32 and 33. It can also be seen that the lowest frequency is 100 Hz when the thickness of the constraining layers 32 and 33 is 2.0 ⁇ m, and 2000 Hz when the thickness of the constraining layers 32 and 33 is 20.0 ⁇ m.
- the minimum frequency of the micro speaker in this embodiment is set to be 100 Hz or more.
- the thickness of the constraining layers 32 and 33 needs to be 2.0 ⁇ m or less, but the constraining layers 32 and 33 are 2.0 ⁇ m. This is because the possibility of breakage such as tearing is increased by making the thickness further thinner.
- the minimum frequency of the microspeaker in the present embodiment is set to be 2000 Hz or less. This is because if the minimum frequency is 2000 Hz or higher, only the sound in the high frequency range of 2000 Hz or higher is reproduced, and the sound in the low frequency range of 2000 Hz or lower becomes difficult to be reproduced, impairing the performance as a speaker. From the above, the thickness range of PEEK consisting of the constraining layers 32 and 33 is suitably 2.0 ⁇ m to 20.0 ⁇ m.
- the optimum range of the thickness of the intermediate layer 31 is determined by the relationship between the thickness of the intermediate layer 31 and the internal loss of the diaphragm.
- the internal loss is an index generally indicating the difficulty of sound, and the higher the internal loss, the less the reverberation is generated inside the speaker.
- the internal loss increases as the thickness of the intermediate layer 31 increases, and depends on the thickness change of the intermediate layer 31. For this reason, the internal loss increases as the thickness of the intermediate layer 31 is increased, and a speaker with less reverberation can be obtained.
- the thickness of the intermediate layer 31 increases, so that the moldability is impaired, and the thickness balance of the constraining layers 32 and 33 is lost when the microspeaker diaphragm edge material 30 is used. .
- the thickness of the intermediate layer 31 is required to obtain a higher internal loss while ensuring the minimum moldability, and the thickness range of the intermediate layer 31 in this embodiment is for a micro speaker. Taking this into consideration, the thickness is set to 5.0 ⁇ m to 50.0 ⁇ m.
- FIG. 9B is a table showing an example of a usage example of the diaphragm edge material 30 for a micro speaker.
- the combination when the thickness of the intermediate layer 31 is in the range of 5.0 ⁇ m to 50.0 ⁇ m and the thickness of the constraining layers 32 and 33 is in the range of 2.0 ⁇ m to 20.0 ⁇ m will be outlined.
- the use example 1 is a diaphragm edge material 30 for a micro speaker used in, for example, an earphone or the like, and the thicknesses of the A-surface constraining layer 32 and the B-surface constraining layer 33 are 2.0 ⁇ m, respectively. is there.
- the range of the thickness of the intermediate layer 31 at this time is set to 5.0 ⁇ m to 11.0 ⁇ m, and the thickness of the diaphragm edge material 30 for microspeaker (the total of the intermediate layer 31 and the constraining layers 32 and 33) is It is 9.0 ⁇ m to 15.0 ⁇ m.
- Use Example 4 is a diaphragm edge material 30 for a micro speaker used in, for example, a notebook personal computer, and the thicknesses of the A-side constraining layer 32 and the B-side constraining layer 33 are 10.0 ⁇ m, respectively. .
- the range of the thickness of the intermediate layer 31 at this time is set to 10.0 ⁇ m to 30.0 ⁇ m, and the thickness of the diaphragm edge material 30 for microspeaker (the total of the intermediate layer 31 and the constraining layers 32 and 33) is 30.0 ⁇ m to 50.0 ⁇ m. As described above, the thicknesses of the intermediate layer 31 and the constraining layers 32 and 33 are appropriately determined according to the type and application of the speaker.
- the hardness of the intermediate layer 31 is set so that the value when measured with a Shore (type) A durometer is A60 or less.
- the Shore (type) A durometer is a test machine for measuring the hardness of a substance, and a push needle is pushed into the surface of the object to be measured and deformed, and the amount of deformation (depth during pushing) ) (JIS K 6253).
- JIS K 6253 the amount of deformation (depth during pushing) )
- the diaphragm edge material for a microspeaker according to the present invention is formed by first forming PEEK having the chemical structural formula shown in FIG. 2A into a sheet shape, and from both sides of the intermediate layer made of acrylic or butyl low hardness agent. Manufactured by sandwiching and molding with a hot press. As a result, as shown in FIG. 1, a diaphragm edge material for a microspeaker composed of three layers of an intermediate layer 31 made of an acrylic or butyl low hardness agent and surface constraining layers 32 and 33 made of PEEK layers on both sides thereof. 30 is obtained.
- the thus produced diaphragm edge member 30 for microspeakers has excellent characteristics such as heat resistance, cold resistance, moisture resistance, moldability, and high internal loss as compared with the conventional one.
- the acrylic or butyl low hardness agent 31 forming the intermediate layer is an adhesive layer having a high damping effect, and PEEK forming the surface constraining layers 32 and 33 on both sides is not only high in rigidity and bending resistance but also strong in breaking strength. As shown in the comparison diagram shown in FIG. 2B, it is a material having a high heat resistance and a wide continuous use temperature range as compared with other materials. It is suitable as a material for diaphragm edges for microspeakers with excellent loss.
- PEEK is polyetheretherketone
- PTEF is fluorocarbon polymers
- PPS is polyphenylene sulfide (Polyphenylene Sulfide Resin)
- PEI is polyetherimide
- PAR is polyarylate
- Polyarylate and PEN are polyethylene naphthalate
- PET is polyethylene terephthalate.
- FIG. 10 is a table comparing the physical property values of the constraining layers 32 and 33 and the diaphragm edge material 30 for a micro speaker.
- the single constraining layers 32 and 33 are PEEK having a thickness of 5.0 ⁇ m, and the maximum point stress, the maximum point strain and the elastic modulus of the constraining layers 32 and 33 are 95. 5N / mm 2, is 35.6% and 3279.3N / mm 2.
- the diaphragm edge material 30 for a micro speaker has a three-layer structure in which the thickness of the intermediate layer 31 is 15.0 ⁇ m and the thickness of the constraining layers 32 and 33 made of PEEK is 5.0 ⁇ m.
- the maximum point stress, the maximum point strain, and the elastic modulus of the speaker diaphragm edge member 30 are 30.0 N / mm 2 , 98.5%, and 999.0 N / mm 2 , respectively.
- the “maximum point stress” is the maximum value of the force generated inside the object per unit area, and the smaller the maximum point stress number, the higher the flexibility.
- the “maximum point strain” is a rate of change when an external force is applied to the object, and indicates that the larger the maximum point strain number, the higher the breakage resistance.
- elastic modulus also called Young's modulus, is a value representing the ratio between stress and strain, and indicates that a smaller elastic modulus number is softer.
- the maximum point stress and elastic modulus of the diaphragm edge material 30 for a micro speaker having a three-layer structure is significantly lower than that of PEEK as the constraining layers 32 and 33.
- This fact is considered to be based on the fact that the intermediate layer 31 is made of acrylic or butyl low hardness and the hardness is Shore A60 or less.
- the maximum point strain is significantly higher in the diaphragm edge material 30 for a micro speaker having a three-layer structure than in PEEK as the constraining layers 32 and 33. This fact is based on the structure in which the intermediate layer 31 is sandwiched between the constraining layers 32 and 33 made of PEEK having high rigidity.
- the diaphragm edge material 30 for microspeakers has a three-layer structure sandwiched between the constraining layers 32 and 33 from both surfaces of the intermediate layer 31, so that it has extremely high flexibility, elasticity, bending resistance, damage resistance, and the like. It was confirmed to have excellent properties.
- test condition temperature 90 (°C)
- Frequency 100 (Hz)
- Test method The microspeaker diaphragm 300 was formed using the microspeaker diaphragm edge member 30, and the time until the microspeaker diaphragm edge member 30 was damaged was measured under the above temperature and frequency conditions. .
- the diaphragm edge material 30 for the microspeaker according to the embodiment is formed of three layers by using an acrylic low hardness agent for the intermediate layer 31 and providing PEEK as the constraining layers 32 and 33 on both surfaces of the intermediate layer 31.
- the diaphragm edge material for a micro speaker according to Comparative Example 1 has a three-layer structure by using an acrylic low hardness agent for the intermediate layer 31 and providing PEI as the constraining layers 32 and 33.
- the diaphragm edge material for microspeakers according to Comparative Example 2 has a three-layer structure by using an acrylic low hardness agent for the intermediate layer 31 and providing PAR as the constraining layers 32 and 33.
- the microspeaker diaphragm edge member 30 according to the example has a time until failure of 125 hours.
- the diaphragm edge materials for microspeakers according to Comparative Example 1 and Comparative Example 2 have 26 hours and 31 hours until breakage, respectively.
- the diaphragm edge material 30 for the microspeaker according to the example has dramatically improved the time until breakage than the diaphragm edge material 30 for the microspeaker according to the first and second comparative examples. I understand that. This is due to the fact that the constraining layers 32 and 33 made of PEEK have excellent heat resistance and bending resistance compared to PEI and PAR.
- the constraining layers 32 and 33 PEEK having high rigidity, heat resistance, and bending resistance, it has excellent heat resistance and cold resistance, and has formability, bending resistance, vibration resistance, and flexibility. It was confirmed that the diaphragm edge material 30 for a micro speaker was obtained.
- Example 2 Embodiments of a microspeaker diaphragm using the microspeaker diaphragm edge material having excellent characteristics described above and a microspeaker incorporating the same will be described below with reference to the drawings.
- 3A and 3B are views for explaining an example of a diaphragm using the diaphragm edge material for a micro speaker according to the present invention.
- 20 is a highly elastic material (paper, engineering plastic film, or light metal sheet such as aluminum or magnesium), and 30 has the structure described in Example 1 and uses a PEEK layer as a surface constraining layer. It is a diaphragm edge material for a micro speaker.
- the diaphragm edge material 30 for the microspeaker in the present embodiment has a ring shape, and is integrally molded after being aligned so that the outer peripheral portion thereof overlaps the inner peripheral portion of the highly elastic material 20.
- the highly elastic material 20 mainly forms the dome portion or body portion of the diaphragm, and the diaphragm edge material 30 for the microspeaker is aligned and integrated so as to mainly form the peripheral edge or edge portion of the diaphragm. Molded and attached to a microspeaker.
- At least one of the highly elastic material 20 and the diaphragm edge material 30 for the microspeaker is provided with an adhesive function in advance (adhesive material may be applied, or characteristics of a material that causes an adhesive action during integral molding may be used).
- adhesive material may be applied, or characteristics of a material that causes an adhesive action during integral molding may be used.
- the highly elastic material 20 and the diaphragm member 30 for microspeaker are bonded and molded to produce a diaphragm for microspeaker with a free edge specification.
- FIG. 3B is a configuration diagram in the case where the diaphragm edge material 30 for a micro speaker produced by simultaneous molding as described above is attached to a voice coil of the micro speaker.
- FIG. 3B shows an example in which the diaphragm edge material 30 for microspeaker is placed on the highly elastic material 20, but conversely, the diaphragm edge material 30 for microspeaker is made of a highly elastic material as shown in FIG. 3C. It is also possible to be below 20.
- FIG. 3B or FIG. 3C is a matter determined in consideration of the structure of the micro speaker. Needless to say, the shape of the molding in the case of integral molding should be an optimum shape according to that.
- FIG. 4A and 4B are diagrams showing another example of the diaphragm according to the present invention.
- 20 is a highly elastic material (paper, engineering plastic film, or light metal sheet such as aluminum or magnesium)
- 30 is a diaphragm edge material for a micro speaker
- the high elastic material 20 is used for a micro speaker.
- the highly elastic material 20 is aligned on the sheet of the diaphragm edge member 30 so as to be positioned at the position of the diaphragm dome, that is, the body (usually the center), and integrally molded.
- the highly elastic material 20 forms the dome portion, that is, the body portion of the diaphragm
- the diaphragm edge material 30 for the microspeaker includes both the dome portion, that is, the body portion of the diaphragm, and the peripheral portion, that is, the edge portion of the diaphragm. Will be formed.
- the dome portion of the diaphragm is formed by a portion where the high elastic material 20 and the diaphragm edge material 30 for the micro speaker overlap, and the peripheral edge portion of the diaphragm is formed only by the diaphragm edge material 30 for the micro speaker.
- At least one of the highly elastic material 20 and the diaphragm edge member 30 for microspeakers is provided with an adhesive function in advance (adhesive material may be applied, or the characteristics of the material that causes an adhesive action during integral molding are utilized.
- adhesive material may be applied, or the characteristics of the material that causes an adhesive action during integral molding are utilized.
- the high elastic material 20 and the diaphragm edge material 30 for microspeaker are bonded and integrally molded, and a diaphragm for microspeaker is manufactured with a free edge specification.
- FIG. 4B and FIG. 5 are diagrams showing a micro speaker diaphragm manufactured as described above and a micro speaker using the micro speaker diaphragm.
- reference numeral 300 denotes a microspeaker diaphragm produced by bonding and molding the highly elastic material 20 and the above-described microspeaker diaphragm edge member 30 as described in FIG. 1, and 30a is a dome portion of the diaphragm. (Body), 30b is a recessed fitting part of the diaphragm, 30c is a peripheral part (edge) of the diaphragm, and 30d is an external sticking part of the diaphragm.
- the dome portion (body) 30a of the diaphragm is formed by laminating the highly elastic material 20 and the diaphragm edge material 30 for the micro speaker, and the peripheral edge (edge) 30c of the diaphragm and the external pasting portion 30d of the diaphragm are It is formed only with the diaphragm edge material 30 for microspeakers.
- Reference numeral 5 denotes a speaker voice coil.
- the microspeaker diaphragm edge member 30 is attached so that the sheet side is in contact with the voice coil 5.
- FIG. 5 is a diagram showing the structure of the speaker unit incorporating the diaphragm 300 shown in FIG. 4B.
- 30 is a diaphragm edge material for a micro speaker
- 30a is a dome portion (body) of the diaphragm
- 30b is a concave fitting portion of the diaphragm
- 30c is a peripheral edge (edge) of the diaphragm
- 30d is a diaphragm.
- 4 is a speaker using a diaphragm (corresponding to the speaker 2 in FIG.
- FIG. 5 is a voice coil
- 7a is an upper magnetic pole plate of the speaker
- 7b is a lower magnetic pole plate of the speaker
- 8 is a magnetic gap
- 9 is External terminals of the speaker
- 10 is a gasket
- 14 is a speaker magnet
- 15 is a magnetic circuit of the speaker
- 17 is a frame
- 26 is a protector.
- FIG. 5 is different from FIG. 8 in the portion of the diaphragm, and has the same configuration as FIG. 8 except for the diaphragm.
- the diaphragm edge material for a micro speaker according to the present invention is excellent in heat resistance, cold resistance, moisture resistance, moldability, high internal loss, and the like, and is an electronic device such as a mobile phone, a portable acoustic device, or a laptop computer. It can also be used as an edge material for microspeakers for electro-acoustic converters in all electronic devices that require speakers.
- Mobile phone 2 Speaker using diaphragm 20: High elastic material (paper, engineering plastic film, Or light metal sheets such as aluminum and magnesum) 30: Diaphragm edge material for microspeakers 31: Intermediate layer (acrylic or butyl low hardness agent) 32, 33: Constrained layer (PEEK; Polyether etherketone: Polyetheretherketone) 3a, 30a: Dome part (body) of diaphragm 3b, 30b: concave fitting portion of diaphragm 3c, 30c: peripheral edge (edge) of diaphragm 3d, 30d: External pasting part of diaphragm 300: Diaphragm 4: Micro speaker using diaphragm 5: Voice coil 7a: Upper magnetic pole plate of speaker 7b: Lower magnetic pole plate of speaker 8: Magnetic gap 9: Outside of speaker Terminal 10: Gasket 14: Speaker magnet 15: Speaker magnetic circuit 17: Frame 26: Protector
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Abstract
Description
図7は、ポリアミドイミド(PAI)樹脂フィルム(またはポリイミド(PI)樹脂フィルム)で成型された振動板の全体図を示す。同図において、3は振動板、3aは振動板のドーム部(ボディ)、3bは振動板の凹嵌部、3cは振動板の周縁部(エッジ)、3dは振動板の外部貼付け部、5はスピーカのボイスコイルである。
マイクロスピーカ用振動板エッジ材は、高耐熱下での破損強度改善のみならず、音響特性の上でも動的振動1周期間にエネルギをできるだけ消散させる必要があり、そのため、本発明のマイクロスピーカ用振動板エッジ材においては、効率良く分散減衰する適材としてダンピング効果の高い粘着層を用い両表面に拘束層を設けたことを特徴とするものである。この方法は拘束層ダンピング処理(constrained layer damping treatment)と呼ばれ、ダンピング効果の高い粘着層に対し拘束層剛性は十分に高い物性が要求される。
(実施例1)
本発明に係るマイクロスピーカ用振動板エッジ材について説明する。
本発明に係るマイクロスピーカ用振動板エッジ材30は、図1に示すように、アクリルまたはブチル低硬度剤からなる中間層(厚さ5μm~50μm)31の両側からPEEKからなる拘束層(厚さ2μm~20μm)32,33で挟んだ構造を有している。
グラフの横軸は、上述のマイクロスピーカ用振動板エッジ材30を用いたマイクロスピーカが出力する周波数の最低値(以下、最低周波数(Hz)とする)であり、縦軸は、拘束層32,33としてのPEEK単一の厚さ(μm)である。なお、最低周波数は、拘束層32,33の厚さを2.0μm、3.5μm、5.0μm、7.0μm、10.0μm、15.0μm及び20.0μmとし、上記厚さごとにそれぞれ測定した。
同図に示すように、使用例1は、例えばイヤホン等に用いられるマイクロスピーカ用振動板エッジ材30であって、A面拘束層32及びB面拘束層33の厚さがそれぞれ2.0μmである。このときの中間層31の厚さの範囲は、5.0μmから11.0μmに設定され、マイクロスピーカ用振動板エッジ材30(中間層31と拘束層32,33の合計)の厚さは、9.0μmから15.0μmである。
また、使用例4は、例えばノート型のパーソナルコンピュータ等に用いられるマイクロスピーカ用振動板エッジ材30であって、A面拘束層32及びB面拘束層33の厚さがそれぞれ10.0μmである。このときの中間層31の厚さの範囲は、10.0μmから30.0μmに設定され、マイクロスピーカ用振動板エッジ材30(中間層31と拘束層32,33の合計)の厚さは、30.0μmから50.0μmである。
以上のように、中間層31及び拘束層32,33の厚さは、スピーカの種類や用途に応じて適宜決定される。
また、マイクロスピーカ用振動板エッジ材30は、中間層31の厚さが15.0μm、PEEKからなる拘束層32,33の厚さがいずれも5.0μmの三層構造であって、当該マイクロスピーカ用振動板エッジ材30の最大点応力、最大点歪及び弾性率は、それぞれ30.0N/mm2、98.5%及び999.0N/mm2である。
なお、「最大点応力」とは、単位面積あたりの物体内部に生ずる力の最大値であり、最大点応力の数字が小さい方がより柔軟性が高いことを示す。また、「最大点歪」とは、物体に外力を加えたときの変化割合であり、最大点歪の数字が大きい方がより耐破損性が高いことを示す。さらに、「弾性率」とは、ヤング率とも言い、応力と歪との比を表わす値であって、弾性率の数字が小さい方がより軟らかいことを示す。
また、最大点歪は、拘束層32,33としてのPEEKよりも、三層構造としたマイクロスピーカ用振動板エッジ材30の方が、大幅に高くなることが分かる。当該事実は、中間層31の両面から剛性の高いPEEKからなる拘束層32,33により挟んだ構造としたことに基づくものである。
以上より、マイクロスピーカ用振動板エッジ材30は、中間層31の両面から拘束層32,33により挟んだ三層構造とすることによって、柔軟性や弾性、耐屈曲性や耐破損性等に極めて優れた特性を有することが確認された。
試験条件
温 度:90(℃)
周 波 数:100(Hz)
試験方法:マイクロスピーカ用振動板エッジ材30を用いて、マイクロスピーカ用振動板300を形成し、上記温度及び周波数の条件下、マイクロスピーカ用振動板エッジ材30が破損するまでの時間を計測した。
これに対し、比較例1に係るマイクロスピーカ用振動板エッジ材は、中間層31にアクリル低硬度剤を用い、拘束層32,33としてのPEIを設けて三層構造とした。また、比較例2に係るマイクロスピーカ用振動板エッジ材は、中間層31にアクリル低硬度剤を用い、拘束層32,33としてのPARを設けて三層構造とした。
このように、実施例に係るマイクロスピーカ用振動板エッジ材30は、比較例1及び比較例2に係るマイクロスピーカ用振動板エッジ材30よりも破損するまでの時間が飛躍的に向上していることが分かる。これは、PEEKからなる拘束層32,33が、PEI及びPARよりも極めて耐熱性に優れ、耐屈曲性を有することに起因している。
以上の結果から、拘束層32,33を剛性,耐熱性,耐屈曲性の高いPEEKとすることにより、耐熱性,耐寒性に優れ、成形性、耐屈曲性,耐振動性,柔軟性を有するマイクロスピーカ用振動板エッジ材30が得られることが確認された。
以下、上述した優れた特性を有するマイクロスピーカ用振動板エッジ材を用いたマイクロスピーカ用振動板とそれを組み込んだマイクロスピーカの実施例を、図面を用いて説明する。
図4Aにおいて、20は高弾性材料(紙,エンジニアリングプラスティックフィルム,あるいはアルミニューム,マグネシューム等の軽金属シート)であり、30はマイクロスピーカ用振動板エッジ材であり、高弾性材料20を、マイクロスピーカ用振動板エッジ材30のシート上に高弾性材料20が振動板のドーム部すなわちボディ部の位置(通常は中央部)になるように位置合わせして一体成型する。
2:振動板を使用したスピーカ
20:高弾性の材料(紙,エンジニアリングプラスティックフィルム,
あるいはアルミニューム,マグネシューム等の軽金属シート)
30:マイクロスピーカ用振動板エッジ材
31:中間層(アクリルまたはブチル低硬度剤)
32,33:拘束層(PEEK;Polyether etherketone:
ポリエーテルエーテルケトン)
3a,30a:振動板のドーム部(ボディ)
3b,30b:振動板の凹嵌部
3c,30c:振動板の周縁部(エッジ)
3d,30d:振動板の外部貼付け部
300:振動板
4:振動板を使用したマイクロスピーカ
5:ボイスコイル
7a:スピーカの上部磁極板
7b:スピーカの下部磁極板
8:磁気空隙
9:スピーカの外部端子
10:ガスケット
14:スピーカのマグネット
15:スピーカの磁気回路
17:フレーム
26:プロテクター
Claims (10)
- ダンピング効果の高い中間層の一方の面にポリエーテルエーテルケトン(PEEK;Polyether etherketone)を、他方の面にポリエーテルエーテルケトン(PEEK;Polyether etherketone)あるいはポリエーテルイミド(PEI;Polyetherimide)を拘束層として設けたことを特徴とするマイクロスピーカ用振動板エッジ材。
- 前記中間層の両面の拘束層をPEEKとし、
前記拘束層の厚さを、2.0μmから20.0μmの範囲としたことを特徴とする請求項1記載のマイクロスピーカ用振動板エッジ材。 - 前記中間層の厚さを、5.0μmから50.0μmの範囲としたことを特徴とする請求項1または請求項2記載のマイクロスピーカ用振動板エッジ材。
- 前記中間層は、アクリルまたはブチル低硬度剤からなることを特徴とする請求項1乃至請求項3いずれかに記載のマイクロスピーカ用振動板エッジ材。
- 前記中間層の硬度を、ショアA60以下としたことを特徴とする請求項1乃至請求項4いずれかに記載のマイクロスピーカ用振動板エッジ材。
- 請求項1乃至請求項5いずれかに記載のマイクロスピーカ用振動板エッジ材を用いたことを特徴とするマイクロスピーカ用振動板。
- 高弾性材料によって形成される振動板のドーム部(ボディ部)と、
リング形状の請求項1乃至請求項5に記載のマイクロスピーカ用振動板エッジ材によって形成される振動板の周縁部(エッジ部)とを有し、
前記高弾性材料の外周部分と前記リング形状のマイクロスピーカ用振動板エッジ材の内周部分を重ね合せた位置関係で一体化したことを特徴とする請求項6に記載のマイクロスピーカ用振動板。 - 振動板のドーム部(ボディ部)を形成する高弾性材料と、
振動板のドーム部(ボディ部)および周縁部(エッジ部)を形成するシート状の請求項1乃至請求項5に記載のマイクロスピーカ用振動板エッジ材を備え、
前記高弾性材料が振動板のドーム部(ボディ部)に位置するように前記シート状のマイクロスピーカ用振動板エッジ材と重ね合わせて一体化したことを特徴とする請求項6に記載のマイクロスピーカ用振動板。 - 請求項6乃至請求項8のいずれかに記載のマイクロスピーカ用振動板を用いたことを特徴とするマイクロスピーカ。
- 請求項9に記載のマイクロスピーカを組み込んだことを特徴とする電子機器。
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JP2013508719A JPWO2012137369A1 (ja) | 2011-04-08 | 2011-09-01 | マイクロスピーカ用振動板エッジ材、マイクロスピーカ用振動板、マイクロスピーカ、および電子機器 |
US14/110,321 US20140072163A1 (en) | 2011-04-08 | 2011-09-01 | Microspeaker diaphragm edge member, microspeaker diaphragm, microspeaker, and electronic device |
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JP2016171555A (ja) * | 2014-07-09 | 2016-09-23 | パナソニックIpマネジメント株式会社 | スピーカ用振動板、スピーカ、装置、及びスピーカ用振動板の製造方法 |
JP2020065274A (ja) * | 2019-12-23 | 2020-04-23 | 信越ポリマー株式会社 | スピーカの振動板用フィルム |
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