EP4068803A1 - Akustische vibrationsplatte und verfahren für die herstellung einer akustischen vibrationsplatte - Google Patents

Akustische vibrationsplatte und verfahren für die herstellung einer akustischen vibrationsplatte Download PDF

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Publication number
EP4068803A1
EP4068803A1 EP20892453.0A EP20892453A EP4068803A1 EP 4068803 A1 EP4068803 A1 EP 4068803A1 EP 20892453 A EP20892453 A EP 20892453A EP 4068803 A1 EP4068803 A1 EP 4068803A1
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EP
European Patent Office
Prior art keywords
thermoplastic resin
acoustic diaphragm
resin film
metal foil
thermal expansion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20892453.0A
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English (en)
French (fr)
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EP4068803A4 (de
Inventor
Junya Kasahara
Eisuke Tachibana
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ube Exsymo Co Ltd
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Ube Exsymo Co Ltd
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Publication date
Application filed by Ube Exsymo Co Ltd filed Critical Ube Exsymo Co Ltd
Publication of EP4068803A1 publication Critical patent/EP4068803A1/de
Publication of EP4068803A4 publication Critical patent/EP4068803A4/de
Pending legal-status Critical Current

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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
    • 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
    • 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
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
    • 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
    • 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
    • H04R2307/027—Diaphragms comprising metallic materials
    • 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

Definitions

  • the present invention relates to an acoustic diaphragm and a method for manufacturing an acoustic diaphragm.
  • a known acoustic diaphragm for use with an audio device such as a speaker or a sonar sensor includes a laminate in which a metal foil and a thermoplastic resin are laminated.
  • Patent Literature 1 discloses an acoustic diaphragm that is obtained by laminating and thermocompression-bonding an aluminum foil and a cast unoriented thermoplastic resin film.
  • Examples of the cast unoriented thermoplastic resin film used in Patent Literature 1 include a polyurethane-based thermoplastic resin film, a polyamide-based thermoplastic resin film, and a polyester-based thermoplastic resin film.
  • Patent Literature 1 Japanese Patent No. 3911935
  • the acoustic diaphragm of Patent Literature 1 is manufactured through a lamination process in which an aluminum foil and a cast unoriented thermoplastic resin film placed one upon the other are heated to a temperature near the melting temperature of the cast unoriented thermoplastic resin film, and the cast unoriented thermoplastic resin film is pressure-bonded to the aluminum foil.
  • the aluminum foil and the cast unoriented thermoplastic resin film of the acoustic diaphragm have different coefficients of thermal expansion.
  • Warping of the acoustic diaphragm adversely affects workability when shaping the acoustic diaphragm into the form of a speaker or the like.
  • one objective of the present invention is to provide an acoustic diaphragm that resists warping.
  • An acoustic diaphragm that solves the above problem includes a metal foil and a thermoplastic resin film laminated on the metal foil.
  • the thermoplastic resin film has a ratio of a coefficient of linear thermal expansion in a thickness-wise direction to a smaller one of a coefficient of linear thermal expansion in an MD-direction and a coefficient of linear thermal expansion in a TD-direction that is between 3.0 and 10.0.
  • a total weight per unit area of the metal foil and the thermoplastic resin film is between 45 g/m 2 and 150 g/m 2 .
  • the metal foil may have a specific gravity of between 1.7 and 5.0.
  • a difference between a coefficient of linear thermal expansion of the metal foil and the smaller one of the coefficient of linear thermal expansion in the MD-direction and the coefficient of linear thermal expansion in the TD-direction of the thermoplastic resin film may be between 0 ppm/K and 15 ppm/K.
  • the coefficient of linear thermal expansion of the metal foil may be between 5.0 ppm/K and 35 ppm/K.
  • the smaller one of the coefficient of linear thermal expansion in the MD-direction and the coefficient of linear thermal expansion in the TD-direction may be between 10 ppm/K and 50 ppm/K.
  • thermoplastic resin film may include at least one polyimide film adjoining the metal foil.
  • a method for manufacturing an acoustic diaphragm that solves the above problem includes a lamination process that thermocompression-bonds the metal foil and the thermoplastic resin film.
  • the acoustic diaphragm in accordance with the present invention resists warping.
  • an acoustic diaphragm 10 is a laminate of a sheet-like metal foil 11 and a thermoplastic resin film 12 that is disposed on one side of the sheet-like metal foil 11.
  • the acoustic diaphragm 10 is used in an audio device as a transducer for acoustic oscillation.
  • the acoustic diaphragm 10 is used in an audio device such as a speaker, a sonar sensor, and a microphone.
  • Examples of the metal forming the metal foil 11 include aluminum, titanium, magnesium, copper, and an alloy combining two or more of the above metals. In these metals, a metal having a specific gravity of between 1.7 and 5.0 is preferred, and a metal having a specific gravity of between 2.4 and 4.9 is further preferred. This improves the sound quality when the acoustic diaphragm 10 is applied to a speaker.
  • the metal foil 11 has a coefficient of linear thermal expansion CTEM of, for example, between 5.0 ppm/K and 35 ppm/K, more preferably between 7.0 ppm/K and 30 ppm/K, and further preferably between 8.0 ppm/K and 28 ppm/K.
  • CTEM coefficient of linear thermal expansion
  • the metal foil 11 has a thickness of, for example, between 10 ⁇ m and 50 ⁇ m, and more preferably between 14 ⁇ m and 35 ⁇ m.
  • the weight per unit area of the metal foil 11 is, for example, between 27 g/m 2 and 130 g/m 2 , and more preferably between 37 g/m 2 and 90 g/m 2 .
  • thermoplastic resin film 12 examples include a polyimide film such as a multilayer aromatic polyimide film or a single-layer polyimide film, a polyetherimide film, a polyester film (including liquid crystal film), a polyamide film (including aramid film), a vinyl ester film, a thermoplastic fluorine resin film, a polyetherketone film (including polyetheretherketone film), a polyphenylsulfone film, and the like.
  • a multilayer aromatic polyimide film includes a layer of polyimide that has a thermocompression bonding property disposed on both sides of an aromatic polyimide film that does not have a pressure-bonding property.
  • thermoplastic resin film 12 For example, a commercially available product such as UPILEX VT TM manufactured by UBE INDUSTRIES, LTD. can be used. Japanese Laid-Open Patent Publication No. 2001-270033 discloses examples of such multilayer aromatic polyimide film. Among them, a polyimide film is particularly preferably used as the thermoplastic resin film 12.
  • the thermoplastic resin film 12 may include another component such as an additive.
  • the thermoplastic resin film 12 may be a resin having voids such as a foamed body.
  • the thermoplastic resin film 12 may have a structure combined with a non-thermoplastic resin film as long as the thermoplastic resin film 12 is adherable to the metal foil 11 without impairing the audio characteristics and the effects of the invention.
  • the thermoplastic resin film 12 may have a multilayer structure in which the thermoplastic resin film 12 is adhered to one side or both sides of the non-thermoplastic resin film.
  • the thermoplastic resin film 12 may have a sea-island structure in which the thermoplastic resin film 12 forms a sea component and the non-thermoplastic resin film forms an island component.
  • the thermoplastic resin film 12 has a ratio CTEZ/CTEX of between 3.0 and 10.0.
  • the ratio CTEZ/CTEX is a ratio of a coefficient of linear thermal expansion CTEZ in a thickness-wise direction to a coefficient of linear thermal expansion CTEX of the smaller one of the coefficient of linear thermal expansion in an MD-direction and the coefficient of linear thermal expansion in a TD-direction. Further, it is preferred that the ratio CTEZ/CTEX be between 4.0 and 9.5, and more preferably between 5.0 and 9.0.
  • the ratio CTEZ/CTEX When the ratio CTEZ/CTEX is 3.0 or greater, molecules in the thermoplastic resin film 12 are oriented in a planar direction at a specific level or greater. This limits warping of the acoustic diaphragm 10. Also, when the ratio CTEZ/CTEX is 10.0 or less, the thermoplastic resin film 12 will be stretchable in the planar direction without lowering resistance against shearing in the planar direction. This improves the workability of the acoustic diaphragm 10. For example, the acoustic diaphragm 10 can easily be drawn into a predetermined shape such as the shape of a dome.
  • the coefficient of linear thermal expansion CTEX of the thermoplastic resin film 12 is, for example, between 10 ppm/K and 50 ppm/K, more preferably between 12 ppm/K and 43 ppm/K, and further preferably between 14 ppm/K and 35 ppm/K.
  • the coefficient of linear thermal expansion CTEX is set within the above-described ranges, the thermoplastic resin film 12 is stretchable in the planar direction so that the workability of the acoustic diaphragm 10 is improved.
  • the thermoplastic resin film 12 has a thickness of, for example, between 12 ⁇ m and 90 ⁇ m, and more preferably between 16 ⁇ m and 75 ⁇ m.
  • the thermoplastic resin film 12 has a weight per unit area of, for example, between 18 g/m 2 and 120 g/m 2 , and more preferably between 22 /m 2 and 100 g/m 2 .
  • the difference CTEX-M (absolute difference) between the coefficient of linear thermal expansion CTEX of the thermoplastic resin film 12 and the coefficient of linear thermal expansion CTEM of the metal foil 11 is between 0 ppm/K and 15 ppm/K, and more preferably between 0 ppm/K and 12 ppm/K.
  • the difference CTEX-M is set within the above-described ranges, warping of the acoustic diaphragm 10 is effectively limited.
  • the acoustic diaphragm 10 has a thickness of, for example, between 22 ⁇ m and 100 ⁇ m, and more preferably between 25 ⁇ m and 85 ⁇ m.
  • the weight per unit area of the acoustic diaphragm 10 is between 45 g/m 2 and 150 g/m 2 , and preferably between 45 g/m 2 and 130 g/m 2 .
  • the weight per unit area of the acoustic diaphragm 10 is set within the above-described ranges, warping of the acoustic diaphragm 10 is limited. Also, when the weight per unit area of the acoustic diaphragm 10 is 150 g/m 2 or less, the sound pressure will not be reduced by the weight.
  • the acoustic diaphragm 10 When the weight per unit area of the acoustic diaphragm 10 is 45 g/m 2 or greater, the acoustic diaphragm 10 becomes more rigid so that the acoustic diaphragm 10 can easily obtain a self-supporting property even when used in an audio device such as a large speaker.
  • the acoustic diaphragm 10 has a resin ratio, or the volume percent of the thermoplastic resin film 12 to the total volume of the metal foil 11 and the thermoplastic resin film 12, that is 60% or less, and more preferably 40% or less.
  • a resin ratio or the volume percent of the thermoplastic resin film 12 to the total volume of the metal foil 11 and the thermoplastic resin film 12, that is 60% or less, and more preferably 40% or less.
  • the thermoplastic resin film 12 is set within the above-described ranges of the resin ratio, warping of the acoustic diaphragm 10 is effectively limited.
  • the acoustic diaphragm 10 is applied to a speaker, the acoustic diaphragm 10 can achieve both the reduction of warping and the improvement of the sound quality at a high level.
  • the lower limit of the resin ratio of the thermoplastic resin film 12 is, for example, 10%.
  • the adhesion strength between the metal foil 11 and the thermoplastic resin film 12 in the acoustic diaphragm 10 is, for example, 0.4 N/mm or greater. This avoids delamination of the acoustic diaphragm 10 when shaped into a predetermined form.
  • internal loss tan ⁇ of the acoustic diaphragm 10 is between 0.02 and 0.08. This improves the sound quality in high-frequency and low-frequency ranges when the acoustic diaphragm 10 is applied to a speaker.
  • the acoustic diaphragm 10 is shaped into a predetermined form such as a flat plate shape or a dome-like shape depending on the intended use and used in an audio device.
  • the acoustic diaphragm 10 is manufactured through, for example, a lamination process in which the metal foil 11 and the thermoplastic resin film 12 are placed one upon the other and thermocompression-bonded.
  • the method used for the thermocompression-bonding in the lamination process is not limited and may be, for example, a known method using a roller-type lamination apparatus, a double belt press machine, or the like.
  • the present embodiment has the following advantages.
  • This method allows for manufacture of the acoustic diaphragm 10 that resists warping.
  • the present embodiment may be modified as follows.
  • the present embodiment and the following modifications can be combined as long as the combined modifications remain technically consistent with each other.
  • the number of layers of the metal foil 11 forming the acoustic diaphragm 10 is not limited to one. Alternatively, the acoustic diaphragm 10 may include two or more layers of the metal foil 11.
  • Fig. 2 shows an example in which the acoustic diaphragm 10 includes a first metal foil 11a, the thermoplastic resin film 12, and a second metal foil 11b that are laminated in order from one side in a lamination direction. That is, the thermoplastic resin film 12 is located between the first metal foil 11a and the second metal foil 11b. In this case, warping in the acoustic diaphragm 10 is significantly limited.
  • the acoustic diaphragm 10 may have a part where the metal foils 11 are successively laminated without an intervening layer in the lamination direction.
  • the metal foils 11 may all be the same or different.
  • the number of layers of the thermoplastic resin film 12 forming the acoustic diaphragm 10 is not limited to one.
  • the acoustic diaphragm 10 may include two or more layers of the thermoplastic resin film 12.
  • Fig. 3 shows an example in which the acoustic diaphragm 10 includes a first thermoplastic resin film 12a, the metal foil 11, and a second thermoplastic resin film 12b that are laminated in order from one side in a lamination direction. That is, the first thermoplastic resin film 12a and the second thermoplastic resin film 12b are laminated on the two sides of the metal foil 11, respectively. In this case, warping in the acoustic diaphragm 10 is significantly limited.
  • the acoustic diaphragm 10 may include a part where the thermoplastic resin films 12 are successively laminated without an intervening layer in the lamination direction.
  • the thermoplastic resin films 12 may all be the same or different.
  • thermoplastic resin film 12 When two or more thermoplastic resin films 12 are included, it is preferred that at least one thermoplastic resin film 12 that is in contact with the metal foil 11 be a polyimide film. In this case, the above-mentioned advantage (7) is obtained.
  • the acoustic diaphragm 10 may include another layer, such as a protection layer, other than the metal foil 11 and the thermoplastic resin film 12.
  • CTE-difference the difference between the coefficient of linear thermal expansion CTEX of the thermoplastic resin film and the coefficient of linear thermal expansion CTEM of the metal foil in the acoustic diaphragm.
  • Example 1 An acoustic diaphragm of Example 1 was obtained by laminating and thermocompression-bonding an aluminum foil AL (type: 1N30) having a thickness of 20 ⁇ m and a polyimide film PI (UPILEX VT manufactured by UBE INDUSTRIES, LTD.) having a thickness of 25 ⁇ m with a double belt press machine.
  • Table 1 shows the specific gravity and the coefficient of linear thermal expansion CTEM of the metal foil and the coefficients of linear thermal expansion CTEX, CTEZ and the weight per unit area of the thermoplastic resin film, which were used in the acoustic diaphragm of Example 1.
  • Table 2 shows CTE-difference, weight per unit area, and resin ratio of the acoustic diaphragm of Example 1.
  • Samples were cut out from the thermoplastic resin film and preprocessed by heating at 300°C for thirty minutes.
  • the heat-processed samples were set in a thermal mechanical analysis (TMA) apparatus (TMA-Q400 manufactured by TA Instruments), and the temperature was increased at a rate of 10°C /min to measure the thermal expansion amount from 50°C to 200°C and calculate the coefficient of linear thermal expansion.
  • TMA thermal mechanical analysis
  • the samples were collected from two locations on the thermoplastic resin film in MD-direction and TD-direction, and the smaller measurement value of the two samples was defined as the coefficient of linear thermal expansion CTEX.
  • thermoplastic resin film A sample was cut out from the thermoplastic resin film and set on a thermal dilatometer that uses laser interferometry (laser thermal dilatometer L1X-1 manufactured by ULVAC-RIKO). Preprocessing of the samples was performed by increasing the temperature to 300°C, holding the temperature for five minutes, and then lowering the temperature to room temperature. Subsequently, the temperature was increased at a rate of 2°C /min to measure the thermal expansion amount from 50°C to 200°C and calculate the coefficient of linear thermal expansion CTEZ.
  • laser interferometry laser interferometry
  • Samples were cut out from the metal foil and preprocessed by heating at 300°C for thirty minutes.
  • the heat-treated samples were set on a thermal mechanical analysis (TMA) apparatus (TMA-Q400 manufactured by TA Instruments), and the temperature was increased at a rate of 10°C /min to measure the thermal expansion amount from 50°C to 200°C and calculate the coefficient of linear thermal expansion.
  • TMA thermal mechanical analysis
  • the samples were collected from two locations on the metal foil in MD-direction and TD-direction, and the smaller measurement value of the two samples was defined as the coefficient of linear thermal expansion CTEM.
  • An aluminum foil AL (5052) having a thickness of 20 ⁇ m was used as the metal foil. Otherwise, the conditions were the same as Example 1.
  • a titanium foil having a thickness of 20 ⁇ m was used as the metal foil.
  • a polyimide foil PI having a thickness of 12.5 ⁇ m was used as the thermoplastic resin film. Otherwise, the conditions were the same as Example 1.
  • An aluminum foil AL (1N30) having a thickness of 30 ⁇ m was used as an acoustic diaphragm of Comparative Example 1.
  • An aluminum foil AL (5052) having a thickness of 30 ⁇ m was used as an acoustic diaphragm of Comparative Example 2.
  • a titanium foil having a thickness of 20 ⁇ m was used as an acoustic diaphragm of Comparative Example 3.
  • a titanium foil having a thickness of 25 ⁇ m was used as an acoustic diaphragm of Comparative Example 4.
  • a magnesium alloy foil (AZ31B) having a thickness of 44 ⁇ m was used as an acoustic diaphragm of Comparative Example 5.
  • thermoplastic resin film was formed by stacking a first polyimide film PI (UPILEX VT manufactured by UBE INDUSTRIES, LTD.) having a thickness of 25 ⁇ m and a second polyimide film PI (UPILEX VT manufactured by UBE INDUSTRIES, LTD.) having a thickness of 50 ⁇ m, in this order, and thermocompression-bonding them using a double belt press machine.
  • the thermoplastic resin film thus obtained was used as an acoustic diaphragm of Comparative Example 6.
  • Table 1 the numerical values in the columns headed "Thermoplastic Resin Film” were obtained from the thermoplastic resin films after the thermocompression-bonding.
  • the ratio CTEZ/CTEX for the coefficient of linear thermal expansion CTEZ of the first polyimide film PI was 5.3
  • CTEZ/CTEX for the coefficient of linear thermal expansion CTEZ of the second polyimide film PI was 6.1.
  • thermoplastic resin film was formed by stacking an aluminum foil AL (1N30) having a thickness of 20 ⁇ m, a first polyimide film PI having a thickness of 25 ⁇ m, and a second polyimide film PI having a thickness of 50 ⁇ m, in this order, and thermocompression-bonding them using a double belt press machine.
  • the thermoplastic resin film thus obtained was used as an acoustic diaphragm of Comparative Example 7.
  • Example 1 An aluminum foil AL (1N30) having a thickness of 6 ⁇ m was used as the metal foil, and a polyimide film PI having a thickness of 12.5 ⁇ m was used as the thermoplastic resin film. Otherwise, the conditions were the same as Example 1.
  • thermoplastic resin film having a thickness of 25 ⁇ m was used as the thermoplastic resin film. Otherwise, the conditions were the same as Example 1.
  • Warping in the acoustic diaphragm of each example and comparative example was evaluated.
  • a sample having a size of 10 cm in length ⁇ 10 cm in width was cut out from the acoustic diaphragm of each example and comparative example and left to rest under the environment of 23°C and 65%RH for at least twenty-four hours to allow the sample to warp. Then, the warped sample was set on a level bench top such that the inwardly curved surface faces the upward direction. The raised height of the sample was measured at the most raised part of the sample from the bench top to evaluate warping in the acoustic diaphragm using the following indices. The results are shown in Table 2.
  • the acoustic diaphragm of examples and comparative examples each underwent ten operations in which the sheet-like acoustic diaphragm was processed with a die to be dome-shaped. The number of processing defects that occurred during the ten operations was counted to evaluate the workability of the acoustic diaphragm using the following indices. The results are shown in Table 2.
  • Speakers were produced by attaching a voice coil to the back surface of the acoustic diaphragm of each example and comparative example, which was dome-shaped and had a diameter of 34 mm.
  • Five panelists listened to the sounds output from the produced speakers and evaluated the sound quality of the acoustic diaphragm using the following indices. The results are shown in Table 2. The sound quality evaluation was omitted for the acoustic diaphragm that could not be processed.
  • Strips of sample having the size of 1 cm in width ⁇ 20 cm in length were prepared for MD-direction and TD-direction from the acoustic diaphragm of each of the examples and Comparative Examples 7 to 9. Then, the adhesiveness was evaluated using the 90°-delamination method as described in JIS C 6471. Evaluation was conducted three times in MD-direction and TD-direction, and the smallest value of the results was defined as the adhesiveness in the diaphragm.
  • the temperature was held at -50°C for ten minutes and then the temperature was increased to 150°C in two hours. Then, the temperature was held at 150°C for ten minutes and then decreased to -50°C in two hours. This cycle was repeated 3000 times.
  • the evaluation results of the sound quality, adhesiveness, and long-term reliability indicate that the acoustic diaphragm of Examples 1 to 3 are applicable as an acoustic diaphragm for a speaker. Although the details are not described, frequency characteristics measured for the acoustic diaphragm of Examples 1 to 3 indicated that a desirable sound pressure reproduction performance was obtained throughout all frequencies.
  • thermoplastic resin film A polyimide foil PI having a thickness of 12.5 ⁇ m was used as the thermoplastic resin film. Otherwise, the conditions were the same as Example 1.
  • Example 1 An aluminum foil AL (1N30) having a thickness of 12 ⁇ m was used as the metal foil, and a polyimide film PI having a thickness of 12.5 ⁇ m was used as the thermoplastic resin film. Otherwise, the conditions were the same as Example 1.
  • thermoplastic resin film A polyimide foil PI having a thickness of 50 ⁇ m was used as the thermoplastic resin film. Otherwise, the conditions were the same as Example 1.
  • An acoustic diaphragm of Example 7 was obtained by laminating and thermocompression-bonding a polyimide film PI having a thickness of 12.5 ⁇ m on both sides of an aluminum foil AL (1N30) having a thickness of 20 ⁇ m with a double belt press machine.
  • An acoustic diaphragm of Example 8 was obtained by laminating and thermocompression-bonding an aluminum foil AL (1N30) having a thickness of 12 ⁇ m on both sides of a polyimide film PI having a thickness of 25 ⁇ m with a double belt press machine.
  • the results of Examples 1 and 4 to 6 indicate that when the resin rate is smaller, warping is limited and the sound quality is improved. In particular, when the resin rate is 60% or less, warping is limited and the sound quality is improved highly effectively. When the resin rate is 40% or less, the sound quality is further improved.
  • Examples 7 to 8 indicate that when the acoustic diaphragm has a laminated structure in which the metal foil is sandwiched between the thermoplastic resin films or a laminated structure in which the thermoplastic resin film is sandwiched between metal foils, warping is significantly limited.
  • the present invention is easily processed into a dome-shaped speaker using a die and is thus suitably utilized as a diaphragm for an active speaker or as a support for a voice coil. Also, the audio characteristics of the present invention are satisfactory. Accordingly, the present invention can be desirably utilized as a diaphragm for a flat surface speaker, a headphone, an earphone, and the like.
  • thermoplastic resin film 12a) first thermoplastic resin film, 12b) second thermoplastic resin film.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Laminated Bodies (AREA)
EP20892453.0A 2019-11-26 2020-11-13 Akustische vibrationsplatte und verfahren für die herstellung einer akustischen vibrationsplatte Pending EP4068803A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019213495A JP7383464B2 (ja) 2019-11-26 2019-11-26 音響振動板、及び音響振動板の製造方法
PCT/JP2020/042412 WO2021106628A1 (ja) 2019-11-26 2020-11-13 音響振動板、及び音響振動板の製造方法

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EP4068803A1 true EP4068803A1 (de) 2022-10-05
EP4068803A4 EP4068803A4 (de) 2023-12-20

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EP (1) EP4068803A4 (de)
JP (1) JP7383464B2 (de)
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001270033A (ja) 2000-03-28 2001-10-02 Ube Ind Ltd フレキシブル金属箔積層体の製造法
JP3911935B2 (ja) 1999-11-19 2007-05-09 松下電器産業株式会社 スピーカ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5336096Y2 (de) * 1972-08-15 1978-09-04
JPS5558698A (en) * 1978-10-25 1980-05-01 Toshiba Corp Speaker diaphragm
JP2001313993A (ja) 2000-04-28 2001-11-09 Fujitsu Ten Ltd 薄形平板スピーカの振動板
JP4756393B2 (ja) * 2008-05-28 2011-08-24 オンキヨー株式会社 スピーカー振動板およびこれを用いた動電型スピーカー
CN103747959B (zh) * 2011-08-09 2016-02-17 宇部爱科喜模株式会社 层叠体制造装置及层叠体的制造方法
JP2017189894A (ja) * 2016-04-12 2017-10-19 宇部エクシモ株式会社 金属積層体及び金属成形体

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3911935B2 (ja) 1999-11-19 2007-05-09 松下電器産業株式会社 スピーカ
JP2001270033A (ja) 2000-03-28 2001-10-02 Ube Ind Ltd フレキシブル金属箔積層体の製造法

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JP7383464B2 (ja) 2023-11-20
WO2021106628A1 (ja) 2021-06-03
EP4068803A4 (de) 2023-12-20
JP2021087067A (ja) 2021-06-03

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