WO2021106628A1 - Plaque de vibration acoustique et procédé de fabrication d'une plaque de vibration acoustique - Google Patents

Plaque de vibration acoustique et procédé de fabrication d'une plaque de vibration acoustique Download PDF

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Publication number
WO2021106628A1
WO2021106628A1 PCT/JP2020/042412 JP2020042412W WO2021106628A1 WO 2021106628 A1 WO2021106628 A1 WO 2021106628A1 JP 2020042412 W JP2020042412 W JP 2020042412W WO 2021106628 A1 WO2021106628 A1 WO 2021106628A1
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WIPO (PCT)
Prior art keywords
thermoplastic resin
resin film
metal foil
linear expansion
acoustic diaphragm
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PCT/JP2020/042412
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English (en)
Japanese (ja)
Inventor
純也 笠原
橘　英輔
Original Assignee
宇部エクシモ株式会社
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Application filed by 宇部エクシモ株式会社 filed Critical 宇部エクシモ株式会社
Priority to CN202080081492.5A priority Critical patent/CN114731470A/zh
Priority to EP20892453.0A priority patent/EP4068803A4/fr
Publication of WO2021106628A1 publication Critical patent/WO2021106628A1/fr

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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 the acoustic diaphragm.
  • acoustic diaphragm used for acoustic equipment such as a speaker and a sonar sensor
  • a laminate in which a metal foil and a thermoplastic resin film are laminated is known.
  • Patent Document 1 discloses an acoustic diaphragm obtained by thermocompression bonding an aluminum metal foil and a non-stretched thermoplastic resin film laminated.
  • the non-stretched thermoplastic resin film a polyurethane-based thermoplastic resin film, a polyamide-based thermoplastic resin film, and a polyester-based thermoplastic resin film are used.
  • the aluminum metal foil and the non-stretched thermoplastic resin film are superposed and heated to near the melting temperature of the non-stretched thermoplastic resin film to heat the non-stretched thermoplastic resin film.
  • a laminating process is performed in which the thermoplastic resin film is pressure-bonded to the aluminum metal foil. Since the aluminum metal foil and the non-stretched thermoplastic resin film constituting the acoustic diaphragm have different coefficients of thermal expansion, the acoustic diaphragm obtained through the laminating step causes a large warp. The warp of the acoustic diaphragm causes a decrease in workability when the acoustic diaphragm is processed into a speaker shape or the like.
  • the present invention was made in view of such circumstances, and the purpose thereof is to provide an acoustic diaphragm that is less likely to warp.
  • the acoustic vibrating plate for solving the above problems includes a metal foil and a thermoplastic resin film laminated on the metal foil, and the thermoplastic resin film has a linear expansion coefficient in the MD direction and a linear expansion coefficient in the TD direction.
  • the ratio of the linear expansion coefficient in the thickness direction to the smaller linear expansion coefficient is 3.0 or more and 10.0 or less, and the total texture of the metal foil and the thermoplastic resin film is 45 g / m 2 or more and 150 g. It is less than / m 2.
  • the metal leaf may have a specific gravity of 1.7 or more and 5.0 or less.
  • the difference between the smaller linear expansion coefficient of the linear expansion coefficient in the MD direction and the linear expansion coefficient in the TD direction of the thermoplastic resin film and the linear expansion coefficient of the metal foil is 0 ppm / It may be K or more and 15 ppm / K or less.
  • the coefficient of linear expansion of the metal foil may be 5.0 ppm / K or more and 35 ppm / K or less.
  • the smaller linear expansion coefficient of the linear expansion coefficient in the MD direction and the linear expansion coefficient in the TD direction of the thermoplastic resin film may be 10 ppm / K or more and 50 ppm / K or less.
  • thermoplastic resin film may include at least one polyimide film adjacent to the metal leaf.
  • a method for manufacturing an acoustic diaphragm that solves the above problems includes a laminating step of thermocompression bonding the metal foil and the thermoplastic resin film.
  • the warp that occurs in the acoustic diaphragm can be suppressed.
  • Sectional drawing of the acoustic diaphragm of embodiment Cross-sectional view of the acoustic diaphragm of the modified example. Sectional drawing of the acoustic diaphragm of another modified example.
  • the acoustic diaphragm 10 is a laminated body including a sheet-shaped metal foil 11 and a thermoplastic resin film 12 laminated on one side of the sheet-shaped metal foil 11.
  • the acoustic diaphragm 10 is applied as a conversion member for acoustic vibration in an acoustic device.
  • Examples of the acoustic device to which the acoustic diaphragm 10 is applied include a speaker, a sonar sensor, and a microphone.
  • Metal leaf examples of the metal constituting the metal foil 11 include aluminum, titanium, magnesium, copper, and an alloy composed of any combination of two or more of these. Among these metals, the metal having a specific gravity of 1.7 or more and 5.0 or less is preferable, and a metal having a specific gravity of 2.4 or more and 4.9 or less is more preferable. In this case, the sound quality is improved when the acoustic diaphragm 10 is applied to the speaker.
  • the coefficient of linear expansion CTEM of the metal foil 11 is, for example, preferably 5.0 ppm / K or more and 35 ppm / K or less, more preferably 7.0 ppm / K or more and 30 ppm / K or less, and 8.0 ppm / K or less. It is more preferably 28 ppm / K or less.
  • the thickness of the metal foil 11 is, for example, preferably 10 ⁇ m or more and 50 ⁇ m or less, and more preferably 14 ⁇ m or more and 35 ⁇ m or less.
  • the basis weight of the metal foil 11 is, for example, preferably 27 g / m 2 or more and 130 g / m 2 or less, and more preferably 37 g / m 2 or more and 90 g / m 2 or less.
  • thermoplastic resin film 12 examples include a polyimide film such as a multilayer aromatic polyimide film and a single-layer polyimide film, a polyetherimide film, a polyester film (including a liquid crystal film), a polyamide film (including an aramid film), and the like. Examples thereof include vinyl ester films, fluoroplastic resin films, polyether ketone films (including polyether ether ketone films), and polyphenyl sulfone films.
  • the multilayer aromatic polyimide film has a polyimide layer having thermocompression bonding properties formed on both sides of a non-bonding aromatic polyimide film.
  • Upirex VT trade name
  • Commercially available products can be used.
  • Such a multilayer aromatic polyimide film is described in, for example, Japanese Patent Application Laid-Open No. 2001-27033.
  • the thermoplastic resin film 12 is particularly preferably a polyimide film.
  • thermoplastic resin film 12 may contain other components such as additives.
  • the thermoplastic resin film 12 may have voids inside the resin such as a foam.
  • the thermoplastic resin film 12 may have a structure combined with the non-thermoplastic resin film as long as it can be adhered to the metal foil 11 and does not impair the effects and acoustic characteristics of the invention.
  • it 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, or the thermoplastic resin film 12 is a sea component and the non-thermoplastic resin film is an island component. It may have a sea-island structure.
  • the ratio of the linear expansion coefficient CTEZ in the thickness direction to the linear expansion coefficient CTEX which is the smaller of the linear expansion coefficient in the MD direction and the linear expansion coefficient in the TD direction, is 3.0 or more and 10 It is less than or equal to 0.0.
  • the ratio CTEZ / CTEX is preferably 4.0 or more and 9.5 or less, and more preferably 5.0 or more and 9.0 or less.
  • a ratio CTEZ / CTEX of 3.0 or more means that the molecules in the thermoplastic resin film 12 are oriented in the plane direction above a specific level, which causes warpage in the acoustic diaphragm 10. Can be suppressed. Further, when the ratio CTEZ / CTEX is 10.0 or less, it is possible to suppress a decrease in durability of the thermoplastic resin film 12 against shearing in the surface direction, and the extensibility in the surface direction is ensured. As a result, the workability when processing the acoustic diaphragm 10 is improved. For example, the acoustic diaphragm 10 can be easily drawn into a predetermined shape such as a dome shape.
  • the coefficient of linear expansion CTEX of the thermoplastic resin film 12 is, for example, preferably 10 ppm / K or more and 50 ppm / K or less, more preferably 12 ppm / K or more and 43 ppm / K or less, and 14 ppm / K or more and 35 ppm / K or more. The following is more preferable.
  • the coefficient of linear expansion CTEX By setting the coefficient of linear expansion CTEX to the above range, the extensibility in the surface direction is ensured, and the workability when processing the acoustic diaphragm 10 is improved.
  • the thickness of the thermoplastic resin film 12 is, for example, preferably 12 ⁇ m or more and 90 ⁇ m or less, and more preferably 16 ⁇ m or more and 75 ⁇ m or less.
  • the basis weight of the thermoplastic resin film 12 is, for example, preferably 18 g / m 2 or more and 120 g / m 2 or less, and more preferably 22 / m 2 or more and 100 g / m 2 or less.
  • the difference CTEX-M (absolute difference) between the coefficient of linear expansion CTEX of the thermoplastic resin film 12 and the coefficient of linear expansion CTEM of the metal foil 11 is preferably 0 ppm / K or more and 15 ppm / K or less. More preferably, it is 0 ppm / K or more and 12 ppm / K or less.
  • the thickness of the acoustic diaphragm 10 is, for example, preferably 22 ⁇ m or more and 100 ⁇ m or less, and more preferably 25 ⁇ m or more and 85 ⁇ m or less.
  • the total texture of the acoustic diaphragm 10, that is, the metal foil 11 and the thermoplastic resin film 12 shall be 45 g / m 2 or more and 150 g / m 2 or less, and 45 g / m 2 or more and 130 g / m 2 or less. Is preferable.
  • the basis weight of the acoustic diaphragm 10 it is possible to suppress the warp that occurs in the acoustic diaphragm 10. Further, when the basis weight of the acoustic diaphragm 10 is 150 g / m 2 or less, it is possible to suppress a decrease in sound pressure due to an increase in weight.
  • the acoustic diaphragm 10 has a grain size of 45 g / m 2 or more, the rigidity of the acoustic diaphragm 10 is improved, and it is easy to secure self-support even when used for an acoustic device such as a large-sized speaker. Become.
  • the resin ratio of the acoustic diaphragm 10, that is, the volume ratio of the thermoplastic resin film 12 to the total volume of the metal foil 11 and the thermoplastic resin film 12 is preferably 60% or less, preferably 40% or less. Is more preferable.
  • the resin ratio of the thermoplastic resin film 12 is preferably 60% or less, preferably 40% or less. Is more preferable.
  • the adhesive strength between the metal foil 11 and the thermoplastic resin film 12 in the acoustic diaphragm 10 is preferably 0.4 N / mm or more, for example. In this case, it is possible to suppress the occurrence of peeling when the acoustic diaphragm 10 is processed into a predetermined shape.
  • the acoustic diaphragm 10 preferably has an internal loss tan ⁇ of 0.02 or more and 0.08 or less. In this case, when the acoustic diaphragm 10 is applied to the speaker, the sound quality in the high frequency range and the sound quality in the low frequency range are improved.
  • the acoustic diaphragm 10 is processed into a predetermined shape such as a flat plate shape or a dome shape according to its use, and is applied to an acoustic device.
  • the acoustic diaphragm 10 can be manufactured, for example, by undergoing a laminating step in which a metal foil 11 and a thermoplastic resin film 12 are laminated and thermocompression bonded.
  • the specific method of thermocompression bonding in the laminating step is not particularly limited, and for example, a known method such as a method using a roll laminating device and a method using a double belt press device can be used.
  • the acoustic diaphragm 10 includes a metal foil 11 and a thermoplastic resin film 12 laminated on the metal foil 11.
  • the ratio of the linear expansion coefficient CTEZ in the thickness direction to the linear expansion coefficient CTEX of the thermoplastic resin film 12 CTEZ / CTEX is 3.0 or more and 10.0 or less.
  • the total basis weight of the metal foil 11 and the thermoplastic resin film 12 is 45 g / m 2 or more and 150 g / m 2 or less.
  • the warp generated in the acoustic diaphragm 10 can be suppressed.
  • the workability when processing the acoustic diaphragm 10 is improved.
  • the metal leaf 11 has a specific gravity of 1.7 or more and 5.0 or less.
  • the sound quality is improved when the acoustic diaphragm 10 is applied to the speaker.
  • the effect of suppressing the warp generated in the acoustic diaphragm 10 can be obtained more remarkably.
  • the coefficient of linear expansion CTEM of the metal foil 11 is 5.0 ppm / K or more and 35 ppm / K or less.
  • the coefficient of linear expansion CTEX of the thermoplastic resin film 12 is 10 ppm / K or more and 50 ppm / K or less.
  • the workability when processing the acoustic diaphragm 10 is improved by ensuring the extensibility in the surface direction.
  • the resin ratio of the acoustic diaphragm 10 is 40% or less.
  • the effect of suppressing the warp generated in the acoustic diaphragm 10 can be obtained more remarkably. Further, when the acoustic diaphragm 10 is applied to the speaker, the sound quality is further improved.
  • the thermoplastic resin film 12 is a polyimide film.
  • the effect of suppressing the warp generated in the acoustic diaphragm 10 can be obtained more remarkably.
  • the method for manufacturing the acoustic diaphragm 10 includes a laminating step in which the metal foil 11 and the thermoplastic resin film 12 are thermocompression bonded.
  • the acoustic diaphragm 10 that is less likely to warp can be manufactured.
  • the number of layers of the metal foil 11 constituting the acoustic diaphragm 10 is not limited to one layer, and may be an acoustic diaphragm 10 including two or more layers of metal foil 11.
  • the first metal foil 11a, the thermoplastic resin film 12, and the second metal foil 11b are laminated in this order from one side in the stacking direction. That is, the thermoplastic resin film 12 is laminated so as to be located between the first metal foil 11a and the second metal foil 11b. In this case, the effect of suppressing the warp generated in the acoustic diaphragm 10 can be obtained more remarkably.
  • the acoustic diaphragm 10 may have a portion in which the metal foils 11 are continuously laminated in the stacking direction.
  • the plurality of metal foils 11 may all be the same metal foil, or may be different metal foils.
  • the number of layers of the thermoplastic resin film 12 constituting the acoustic diaphragm 10 is not limited to one layer, and the acoustic diaphragm 10 including two or more layers of the thermoplastic resin film 12 may be used.
  • the first thermoplastic resin film 12a, the metal foil 11, and the second thermoplastic resin film 12b are laminated in this order from one side in the stacking direction. That is, the first thermoplastic resin film 12a and the second thermoplastic resin film 12b are laminated on both sides of the metal foil 11. In this case, the effect of suppressing the warp generated in the acoustic diaphragm 10 can be obtained more remarkably.
  • the acoustic diaphragm 10 may have a portion in which the thermoplastic resin films 12 are continuously laminated in the stacking direction.
  • the plurality of thermoplastic resin films 12 may all be the same thermoplastic resin film, or may be different thermoplastic resin films.
  • thermoplastic resin films 12 When a plurality of thermoplastic resin films 12 are provided, it is preferable that at least one thermoplastic resin film 12 in contact with the metal foil 11 is a polyimide film. In this case, the effect of (7) above can be obtained.
  • the acoustic diaphragm 10 may further include a metal foil 11 such as a protective layer and other layers other than the thermoplastic resin film 12.
  • thermoplastic resin film The acoustic diaphragm in which the volume ratio of the thermoplastic resin film to the total volume of the metal foil and the thermoplastic resin film is 40% or less.
  • thermoplastic resin film is laminated between the first metal foil and the second metal foil.
  • CTE difference the difference between the coefficient of linear expansion CTEX of the thermoplastic resin film in the acoustic diaphragm and the coefficient of linear expansion CTEM of the metal foil.
  • Example 1 The sound of Example 1 is obtained by laminating and thermocompression bonding an aluminum foil AL (material: 1N30) having a thickness of 20 ⁇ m and a polyimide film PI (UPIREX VT manufactured by Ube Industries, Ltd.) having a thickness of 25 ⁇ m using a double belt press device. Obtained a diaphragm.
  • Table 1 shows the specific gravity and coefficient of linear expansion CTEM of the metal foil used for the acoustic diaphragm of Example 1, and the coefficients of linear expansion CTEX, CTEZ and grain of the thermoplastic resin film.
  • Table 2 shows the CTE difference, basis weight, and resin ratio of the acoustic diaphragm of Example 1.
  • the sample cut out from the thermoplastic resin film was heat-treated at 300 ° C. for 30 minutes as a pretreatment.
  • the heat-treated sample is set in a TMA (Thermal Mechanical Analysis) device (TMA-Q400 manufactured by TA Instruments), and the amount of thermal expansion of 50 ° C to 200 ° C is increased while raising the temperature at a heating rate of 10 ° C / min. It was measured and the coefficient of linear expansion was determined. Samples were taken from two locations in the MD direction and TD direction of the thermoplastic resin film, and the smaller of the measured values of the two samples was defined as the coefficient of linear expansion CTEX.
  • the sample cut out from the metal foil was heat-treated at 300 ° C. for 30 minutes as a pretreatment.
  • the heat-treated sample is set in a TMA (Thermal Mechanical Analysis) device (TMA-Q400 manufactured by TA Instruments), and the amount of thermal expansion of 50 ° C to 200 ° C is increased while raising the temperature at a heating rate of 10 ° C / min. It was measured and the coefficient of linear expansion was determined. Samples were collected from two locations in the MD direction and TD direction of the metal foil, and the smaller of the measured values of the two samples was defined as the coefficient of linear expansion CTEM.
  • Example 2 As the metal foil, an aluminum foil AL (5052) having a thickness of 20 ⁇ m was used. Other points are the same as in the first embodiment.
  • Example 3 As the metal foil, a titanium foil having a thickness of 20 ⁇ m was used. As the thermoplastic resin film, a polyimide film PI having a thickness of 12.5 ⁇ m was used. Other points are the same as in the first embodiment.
  • Comparative Example 1 An aluminum foil AL (1N30) having a thickness of 30 ⁇ m was used as the acoustic diaphragm of Comparative Example 1.
  • Comparative Example 2 An aluminum foil AL (5052) having a thickness of 30 ⁇ m was used as the acoustic diaphragm of Comparative Example 2.
  • Comparative Example 3 A titanium foil having a thickness of 20 ⁇ m was used as the acoustic diaphragm of Comparative Example 3.
  • Comparative Example 4 A titanium foil having a thickness of 25 ⁇ m was used as the acoustic diaphragm of Comparative Example 4.
  • Comparative Example 5 A magnesium alloy foil (AZ31B) having a thickness of 44 ⁇ m was used as the acoustic diaphragm of Comparative Example 5.
  • thermoplastic resin film column of Table 1 is a numerical value of the thermoplastic resin film after thermocompression bonding.
  • the ratio CTEZ / CTEX of the linear expansion coefficient CTEZ of the first polyimide film PI is 5.3
  • CTEZ / CTEX of the linear expansion coefficient CTEZ of the second polyimide film PI is 6.1.
  • Comparative Example 7 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 are laminated and heated in the above order using a double belt press device.
  • the crimped thermoplastic resin film was used as the acoustic vibrating plate of Comparative Example 7.
  • thermoplastic resin film (Comparative Example 8) 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. Other points are the same as in the first embodiment.
  • thermoplastic resin film a polyethylene terephthalate film PET having a thickness of 25 ⁇ m was used. Other points are the same as in the first embodiment.
  • a sample cut out from the acoustic diaphragm of each Example and each Comparative Example to a size of 10 cm in length ⁇ 10 cm in width is allowed to stand in an environment of 23 ° C. and 65% RH for 24 hours or more, and then the concave surface in the generated warp is on the upper side. It was placed on a horizontal table like this. The height of the part that was most lifted from the table in the sample was measured, and the warp of the acoustic diaphragm was evaluated according to the following criteria. The results are shown in Table 2.
  • the lifting height is less than 2 mm.
  • the lifting height is 2 mm or more and less than 5 mm.
  • the lifting height is 5 mm or more and less than 10 mm.
  • the floating height is 10 mm or more, or the sample is curled into a tubular shape.
  • the acoustic diaphragm could be easily set in the mold, and no processing defects occurred.
  • a speaker was produced by adhering a voice coil to the back surface of the acoustic diaphragm of each of the examples and comparative examples processed into a dome shape having a diameter of 34 mm.
  • the sound output from the produced speaker was listened to by five panelists, and the sound quality of the acoustic diaphragm was evaluated according to the following criteria. The results are shown in Table 2. For the acoustic diaphragm that could not be processed, the evaluation of sound quality is omitted.
  • the number of panelists judged to have favorable sound quality is 2 or less.
  • a strip sample with a width of 1 cm and a length of 20 cm was prepared from the acoustic diaphragms of Examples and Comparative Examples 7 to 9 in the MD direction and the TD direction, and the adhesion was improved by the 90 ° peeling method described in JIS C 6471. evaluated. Of the results of evaluation three times in each of the MD direction and the TD direction, the minimum value was taken as the adhesion of the diaphragm.
  • Heat cycle test conditions Hold at -50 ° C for 10 minutes, then raise to 150 ° C in 2 hours, hold at 150 ° C for 10 minutes, and then lower to -50 ° C in 2 hours. This cycle is set to 1, and 3000 cycles are repeated.
  • the acoustic diaphragms of Comparative Examples 1 to 6 composed of only one of the metal foil and the thermoplastic resin film did not warp, but the metal foil and the thermoplastic resin film were laminated.
  • the acoustic diaphragms of Comparative Examples 7 to 9 are greatly warped. When the acoustic diaphragms of Comparative Examples 7 to 9 were processed, the workability was poor or the processing itself was impossible.
  • the ratio CTEZ / CTEX of the linear expansion coefficient CTEZ of the thermoplastic resin film is 3.0 or more and 10.0 or less, and the total of the textures.
  • the acoustic diaphragms of Examples 1 to 3 having a value of 45 g / m 2 or more and 150 g / m 2 or less did not cause a large warp. Then, the acoustic diaphragms of Examples 1 to 3 could be easily processed without causing processing defects.
  • the acoustic diaphragms of Examples 1 to 3 can be applied as acoustic diaphragms for speakers. Although details are omitted, when the frequency characteristics of the acoustic diaphragms of Examples 1 to 3 were measured, good sound pressure reproducibility was shown over all frequencies.
  • ⁇ Test 2> As shown in Table 3, acoustic diaphragms of Examples 4 to 8 having different thicknesses and arrangements of the metal foil and the thermoplastic resin film were prepared, and various evaluations were performed in the same manner as in Test 1. The results are shown in Table 4.
  • thermoplastic resin film a polyimide film PI having a thickness of 12.5 ⁇ m was used. Other points are the same as in the first embodiment.
  • Example 5 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. Other points are the same as in the first embodiment.
  • thermoplastic resin film a polyimide film PI having a thickness of 50 ⁇ m was used. Other points are the same as in the first embodiment.
  • Example 7 Using a double belt press device, the same polyimide film PI having a thickness of 12.5 ⁇ m was laminated and thermocompression bonded on both sides of an aluminum foil AL (1N30) having a thickness of 20 ⁇ m to obtain an acoustic diaphragm of Example 7.
  • Example 8 Using a double belt press device, the same aluminum foil AL (1N30) having a thickness of 12 ⁇ m was laminated and thermocompression bonded on both sides of a polyimide film PI having a thickness of 25 ⁇ m to obtain an acoustic diaphragm of Example 8.
  • the effect of suppressing warpage can be obtained by forming an acoustic vibration plate having 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 the metal foils. It can be seen that it is obtained more prominently.
  • the present invention can be easily processed into a dome-shaped speaker using a mold, it can be suitably used as a diaphragm for an active speaker or a support for a voice coil. Further, since the acoustic characteristics are good, it can be suitably used for a diaphragm for a flat speaker, a diaphragm for headphones, a diaphragm for earphones, and the like.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
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  • Multimedia (AREA)
  • Manufacturing & Machinery (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne une plaque de vibration acoustique 10, qui est pourvue d'une feuille métallique 11 et d'un film de résine thermoplastique 12 stratifié sur la feuille métallique 11. Le rapport d'un coefficient linéaire de dilatation CTEZ dans la direction de l'épaisseur à un coefficient linéaire de dilatation CTEX du film de résine thermoplastique 12, ou CTEZ/CTEX, est de 3,0 à 10,0 inclus. Le total des poids de base de la feuille métallique 11 et du film de résine thermoplastique 12 est de 45 g/m2 à 150 g/m2 inclus.
PCT/JP2020/042412 2019-11-26 2020-11-13 Plaque de vibration acoustique et procédé de fabrication d'une plaque de vibration acoustique WO2021106628A1 (fr)

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CN202080081492.5A CN114731470A (zh) 2019-11-26 2020-11-13 声学振动板及声学振动板的制造方法
EP20892453.0A EP4068803A4 (fr) 2019-11-26 2020-11-13 Plaque de vibration acoustique et procédé de fabrication d'une plaque de vibration acoustique

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JP2019-213495 2019-11-26
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

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JPS4953731U (fr) * 1972-08-15 1974-05-13
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
JP2001313993A (ja) * 2000-04-28 2001-11-09 Fujitsu Ten Ltd 薄形平板スピーカの振動板
JP2010011436A (ja) * 2008-05-28 2010-01-14 Onkyo Corp 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

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