WO2019209062A1 - Membrane - Google Patents

Membrane Download PDF

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Publication number
WO2019209062A1
WO2019209062A1 PCT/KR2019/005042 KR2019005042W WO2019209062A1 WO 2019209062 A1 WO2019209062 A1 WO 2019209062A1 KR 2019005042 W KR2019005042 W KR 2019005042W WO 2019209062 A1 WO2019209062 A1 WO 2019209062A1
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WO
WIPO (PCT)
Prior art keywords
diaphragm
support surface
protrusion
central
reinforcement
Prior art date
Application number
PCT/KR2019/005042
Other languages
English (en)
Korean (ko)
Inventor
박래범
Original Assignee
(주) 파켐코리아
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by (주) 파켐코리아 filed Critical (주) 파켐코리아
Publication of WO2019209062A1 publication Critical patent/WO2019209062A1/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
    • 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

Definitions

  • the present invention relates to a diaphragm, and more particularly, to a diaphragm capable of minimizing frequency distortion by increasing the rigidity of the diaphragm.
  • a speaker or earphone is a force coil when a current-carrying conductor is placed in a magnetic field, and according to Fleming's left-hand law, a voice coil exists between voids to convert electromagnetic energy into mechanical vibration energy. It is made by principle.
  • a dynamic driver is a principle in which electrical energy is converted into mechanical vibration by Fleming's left-hand law, which is applied when a current is applied to an electrical circuit (eg, a voice coil) disposed in a constant magnetic field.
  • the voice coil When an electrical signal including a peak pressure of an acoustic signal including several frequencies is applied to the voice coil, the voice coil generates mechanical vibration energy according to the strength of the current and the magnitude of the frequency. The vibration is transmitted to the diaphragm attached to the voice coil so that a sound pressure that the ear can recognize is generated in the diaphragm.
  • the voice coil is generally disposed at a position spaced apart from the outer periphery of the permanent magnet by using the permanent magnet.
  • the voice coil is wound a predetermined number of times.
  • an electric signal including a sound signal peak pressure of a predetermined frequency band is applied to the voice coil, the voice coil is vibrated in a direction perpendicular to the winding direction.
  • the diaphragm is usually manufactured using a synthetic resin film.
  • the diaphragm of such a synthetic resin film has a limitation in reproducing the bass, and uses a synthetic resin film and makes it thin in order to improve the quality of the bass reproduction.
  • the thinner the material the physical stiffness and elasticity are bound to have a threshold that collapses the structure of the diaphragm. That is, when the vibration proceeds, physical division vibration or distortion occurs in the diaphragm. As a result, unintended harmonics are formed and phase shifts are generated for each part, which results in an increase in total housing distortion (THD) and peaks and dips in specific frequency bands, thereby degrading acoustic characteristics. Because it is.
  • TDD total housing distortion
  • the problem to be solved by the present invention is to provide a diaphragm having a certain stiffness and elasticity even when using a thin synthetic resin film.
  • the diaphragm according to an embodiment of the present invention includes a diaphragm portion including a central portion and a surround portion disposed to surround the central portion; And a reinforcing part coupled to one surface of the central part, wherein the reinforcing part includes a support surface for supporting the reinforcing part; And one or more protrusions protruding from the support surface.
  • the central portion may be formed to protrude with a predetermined curvature, and the one or more protrusions may protrude in the protruding direction of the central portion from the support surface.
  • An upper surface of the at least one protrusion may be coupled to one surface of the central portion.
  • the voice coil unit may be coupled to the reinforcement unit, and a groove formed by the one or more protrusions may be disposed between the voice coil unit and the reinforcement unit so that air inside the voice coil unit is discharged to the outside.
  • a predetermined gap is formed between the central portion and the reinforcement portion, and the gap may be sealed with the outside to fill air therein.
  • the one or more protrusions may be provided in plurality, and the plurality of protrusions may be spaced apart from each other to protrude from the support surface.
  • the planes of the plurality of protrusions may be formed in a circular or polygonal shape or a shape in which several shapes are combined.
  • the central portion may be formed to protrude with a predetermined curvature, and the upper surface curvature of the one or more protrusions may have a curvature at least partially equal to the curvature of the central portion.
  • the reinforcing portion over the center portion and the surround portion of the diaphragm portion, even if the diaphragm is manufactured using a thin synthetic resin film, there is an effect that can maximize the rigidity and elasticity of the diaphragm.
  • the reinforcement can also reinforce the weak stiffness of the diaphragm center to the maximum with minimal increase in mass due to the plurality of protrusions and support surfaces spaced apart from the central part.
  • the rigidity of the diaphragm may be compensated for.
  • a voice coil can be combined with a reinforcement part or a center part. Accordingly, it is possible to adjust the inner diameter of the voice coil and the size of the magnetic circuit, thereby controlling the performance including the dynamic driver output and sensitivity.
  • FIG. 1 is a perspective view showing the upper surface of the diaphragm according to an embodiment of the present invention.
  • FIG. 2 is an exploded perspective view of the reinforcing part separated from the drawing of FIG. 1 to explain the coupling relationship between the diaphragm part and the reinforcing part according to an exemplary embodiment of the present invention.
  • FIG 3 is a perspective view showing the bottom surface of the diaphragm according to an embodiment of the present invention.
  • FIG. 4 is an exploded perspective view of the reinforcing part separated from the drawing of FIG. 3 to explain the reinforcing part of the diaphragm according to the exemplary embodiment of the present invention.
  • FIG. 5 is a view showing a cross section of the diaphragm according to an embodiment of the present invention.
  • FIG. 6 is a view showing that the voice coil unit is coupled to the diaphragm according to an embodiment of the present invention.
  • FIG. 7 is an exploded perspective view of the voice coil unit separated from the diagram of FIG. 7 to describe the voice coil unit coupled to the diaphragm according to the exemplary embodiment of the present invention.
  • FIG. 8 is a diagram illustrating region A of FIG. 6.
  • FIG. 9 is a view for explaining various examples for explaining the coupling relationship of the diaphragm according to an embodiment of the present invention.
  • FIG. 1 is a perspective view showing the upper surface of the diaphragm according to an embodiment of the present invention
  • Figure 2 is a reinforcement in the Figure of Figure 1 to explain the coupling relationship between the diaphragm portion and the reinforcement portion according to an embodiment of the present invention The exploded perspective view which separated the part.
  • Figure 3 is a perspective view showing the lower surface of the diaphragm according to an embodiment of the present invention
  • Figure 4 is separated from the reinforcement in the Figure of Figure 3 to explain the reinforcement of the diaphragm according to an embodiment of the present invention Exploded perspective view.
  • FIGS. 3 and 4 illustrate a state in which the diaphragm 100 illustrated in FIGS. 1 and 2 is rotated 180 degrees in the vertical direction. Accordingly, the upper surface described with reference to FIGS. 1 and 2 can be described as the lower surface when the FIGS. 3 and 4 are described.
  • the diaphragm 110 is provided to reproduce sound.
  • the diaphragm 110 is installed in a frame included in a speaker or earphone, and as shown, a surround part disposed around the central part 112 to surround the central part 112 and the central part 112 disposed at the center ( 114).
  • central portion 112 and the surround portion 114 includes a connecting portion 116 connecting the central portion 112 and the surround portion 114, the surround portion 114 for mounting the diaphragm 100 in a frame or the like. It may further include a mounting portion 118 disposed to surround.
  • the central portion 112 may have a shape of a dome that protrudes to have a predetermined curvature.
  • the upper portion of the sphere may have a cut shape.
  • a description will be given of the center portion 112 is formed in the shape of a dome, the center portion 112 may be formed in the shape of a cone, if necessary, in addition to other shapes may be formed.
  • the surround portion 114 is disposed to surround the central portion 112 and may have a shape of a dome protruding to have a predetermined curvature.
  • the upper portion of the donut shape may have a cut shape. Can be.
  • the surround portion 114 has a dome shape of a predetermined shape, but various bends or patterns may be formed in the auxiliary dome as necessary.
  • the center part 112 and the surround part 114 may be made of the same material, and if necessary, the material of the surround part 114 may be made of a different material from that of the center part 112.
  • the central portion 112 and the surround portion 114 may each be made of a synthetic resin film, and, if necessary, may be made of pulp such as paper, impregnated fiber, multiple laminated (layered) film, bio cellulose, graphite, or the like. have.
  • the height of the central portion 112 and the surround portion 114 protruding upward may be the same, but the height of the central portion 112 and the surround portion 114 may be different from each other.
  • the reinforcement part 120 is coupled to the lower portion of the diaphragm portion 110, and specifically to the lower portion of the central portion 112. In the present embodiment, only the reinforcement portion is described below coupled to the lower portion of the diaphragm portion, but the reinforcement portion may be coupled to the upper portion of the diaphragm portion as necessary.
  • the reinforcement part 120 may have a shape in which a part of a sphere is cut, such as the shape of the center part 112, and the support surface 122, the binding surface 124, the central protrusion 126, and the auxiliary protrusion 128 may be formed. It may include.
  • the reinforcement portion 120 may be made of the same material as the diaphragm portion 110, a thin synthetic resin film, pulp, such as paper, impregnated fibers, multi-layer (layered) film, bio cellulose as necessary And graphite or the like.
  • the support surface 122 includes first to third support surfaces 122a, 122b, and 122c.
  • the first support part 122a may have a curvature similar to that of the center part 112 and may be formed in a shape in which a portion of the sphere is cut.
  • the first support surface 122a is formed to have a curvature in the same direction as the center portion 112.
  • the support surface 122 may be made of a thin synthetic resin film.
  • the second support surface 122b is disposed outside to surround the first support surface 122a and extends from the first support surface 122a.
  • the second support surface 122b may be formed in a plane parallel to the horizontal plane, and may be formed in a predetermined width.
  • the first support surface 122a may be formed in the shape of a dome protruding upward from the second support surface 122b.
  • the third support surface 122c is disposed outside to surround the second support surface 122b and extends from the second support surface 122b.
  • the third support surface 122c may be formed in a shape inclined upwardly outward from the second support surface 122b and may have a predetermined width.
  • the third support surface 122c may have a cross-sectional shape in a curved shape, but is not limited thereto and may be formed in a straight line.
  • the cross-sectional shape of the first support surface 122a and the third support surface 122c with respect to the second support surface 122b may be formed in a straight line or a curve inclined upward.
  • the central protrusion 126 and the auxiliary protrusion 128 are each integrally formed on the support surface 122. As will be described in detail later, the central protrusion 126 and the secondary protrusion 128 are formed in a continuous surface on the support surface 122.
  • the central protrusion 126 may be disposed in the center of the first support surface 122a of the reinforcement part 120, and may be formed to protrude from the first support surface 122a in a shape such as a circular column. have. In this case, the central protrusion 126 may have a shape protruding in the same direction as the direction in which the first support surface 122a protrudes.
  • the shape of the central protrusion 126 is described as having a circular columnar shape, but may be formed in various shapes as necessary.
  • the planar shape of the diaphragm 110 is described as being circular, the planar shape of the central protrusion 126 is formed to correspond to the circular shape. Accordingly, when the shape of the diaphragm 110 is formed in a square shape or the like, the shape of the central protrusion 126 may also vary accordingly.
  • the auxiliary protrusion 128 is disposed around the central protrusion 126, and as shown in the drawing, a plurality of auxiliary protrusions 128 may be formed on the first support surface 122a.
  • the outer auxiliary protrusion 129 disposed on the outermost side of the plurality of auxiliary protrusions 128 may be formed over the first to third support surfaces 122a, 122b, and 122c, as shown. Accordingly, the remaining auxiliary protrusions 128 except for the outer auxiliary protrusion 129 may be disposed on the first support surface 112a.
  • the shape of the auxiliary protrusion 128 may have a shape of an approximately polygonal column, and for example, may be formed in the shape of a hexagonal pillar. At this time, the shape of the auxiliary protrusion 128 may be formed so that the side is a round shape, even if formed in the shape of a polygonal pillar.
  • the auxiliary protrusion 128 may have a shape protruding in the direction in which the first support surface 122a protrudes, like the central protrusion 126.
  • the plurality of auxiliary protrusions 128 may be disposed around the central protrusion 126 to surround the central protrusion 126, and may be spaced apart from the central protrusion 126 by a predetermined distance. In addition, the plurality of auxiliary protrusions 128 may be spaced apart from each other by a predetermined distance.
  • outer auxiliary protrusion 129 adjacent to the binding surface 124 of the plurality of auxiliary protrusions 128 may have a curved shape in which the bottom surface of the polygonal shape extends to the binding surface 124.
  • the plurality of auxiliary protrusions 128 are arranged in a shape surrounding the center around the central protrusion 126 disposed in the center of the reinforcement part 120, and the size becomes larger as the distance from the central protrusion 126 is disposed. Can be. That is, the size of the auxiliary protrusion 128 disposed close to the central protrusion 126 may be smaller than the size of the auxiliary protrusion 128 disposed far from the central protrusion 126. Accordingly, more auxiliary protrusions 128 may be disposed in the reinforcement part 120.
  • the height of the central protrusion 126 and the auxiliary protrusion 128 may be relatively smaller than the width of the central protrusion 126 or the auxiliary protrusion 128 in plan view. Accordingly, even if the distance between the central protrusion 126 or the auxiliary protrusion 128 is narrowed due to the vibration of the central portion 112, interference such as hitting between the central protrusion 126 and the plurality of auxiliary protrusions 128 does not occur. Can be.
  • the side surfaces forming the central protrusion 126 and the plurality of auxiliary protrusions 128 may be vertically formed in the horizontal plane, respectively.
  • the support surface 122 is formed to have a curved surface, such as the central portion 112
  • the sides of the central protrusion 126 and the sides of the plurality of auxiliary protrusions 128 are perpendicular to the support surface 122. It may not be formed so as to have a predetermined angle. Accordingly, the central protrusion 126 and the plurality of auxiliary protrusions 128 may maintain a constant distance from each other.
  • the present invention is not limited thereto, and the central protrusion 126 and the plurality of auxiliary protrusions 128 may protrude in a direction perpendicular to the support surface 122.
  • the reinforcement part 120 may be separately manufactured and coupled to the diaphragm part 110.
  • the upper surface of the reinforcement portion 120 may be coupled to the lower surface of the central portion 112.
  • the reinforcement part 120 and the center part 112 may be bonded through an adhesive or the like, or may be bonded through thermal bonding as necessary.
  • the centers which are respectively the upper surfaces of the central protrusion 126 and the auxiliary protrusion 128 protruding from the support surface 122 of the reinforcement portion 120.
  • the protrusion coupling surface 126a and the auxiliary protrusion coupling surface 128a may be brought into contact with the bottom surface of the central portion 112.
  • a binding surface 124 disposed to surround the support surface 122 may be coupled to the connection portion 116.
  • the shape of the central portion 112 may be prevented by the reinforcement 120 due to an external force. That is, as described above, the central protrusion 126 and the auxiliary protrusion 128 are formed so as to protrude in the direction in which the first support surface 122a protrudes, respectively, in the direction in which the first support surface 122a protrudes. It is possible to prevent the shape from being deformed in the opposite direction.
  • the central protrusion 126 and the plurality of auxiliary protrusions 128 formed on the reinforcement part 120 may be integrally formed with the support surface 122, as shown, and the central protrusion 126 and the plurality of auxiliary protrusions.
  • the protrusion 128 protrudes in the upper direction of the support surface 122 by pressing a portion of the support surface 122 (in this case, the upper direction of the support surface 122 means the direction in which the support surface 122 protrudes.) Can be formed.
  • the reinforcement part 120 may be formed of one sheet of synthetic resin film, and the center protrusion 126 and the plurality of auxiliary protrusions 128 may have grooves H formed on the rear surface of the protruding direction, respectively.
  • the central protrusion 126 and the auxiliary protrusion 128 are formed extending from the support surface 122, so that the central protrusion located far from the support surface 122 when the central portion 112 is vibrated.
  • the spaced apart distances of the bottom of the 126 and the sub-projection 128 can be widened.
  • the reinforcement part 120 is relatively larger than the diaphragm part 110. It may have a light weight, and when the central portion 112 is vibrated, the influence of the weight of the reinforcement portion 120 may be minimized.
  • FIG. 5 is a view showing a cross section of the diaphragm according to an embodiment of the present invention.
  • FIG. 5 is a cross-sectional view of the diaphragm 100 by cutting the diaphragm 100 shown in FIG. 1 in a vertical direction.
  • the reinforcement portion 120 is coupled to the central portion 112.
  • a groove H may be formed at a lower portion of the central protrusion 126 and the auxiliary protrusion 128 included in the reinforcement part 120.
  • a gap between the reinforcement part 120 and the center part 112 is provided as the central protrusion part 126 and the plurality of auxiliary protrusion parts 128 are spaced apart from each other. (G) is formed.
  • the gap G formed as described above when the reinforcing portion 120 is coupled to the central portion 112, the upper surface of the central projection engaging surface 126a and the auxiliary projection 128, which is the upper surface of the central projection 126.
  • the auxiliary auxiliary protrusion engaging surface 128a is brought into contact with the bottom surface of the central part 112, and the binding surface 124 is brought into surface contact with the connecting part 116, the reinforcing part 120 and the central part 112 are separated. It is formed by forming an enclosed space with the outside. Since a predetermined air is included in the gap G thus formed, the rigidity of the diaphragm 110 may be more maximized by the air included in the gap G.
  • FIG. 6 is a view illustrating a voice coil unit coupled to a diaphragm according to an embodiment of the present invention
  • FIG. 7 illustrates a voice coil unit coupled to a diaphragm according to an embodiment of the present invention. It is an exploded perspective view which isolate
  • separated the voice coil part from a figure. 8 is a diagram illustrating region A of FIG. 6.
  • the voice coil unit 130 may be coupled to the diaphragm 100 according to the present embodiment.
  • the voice coil unit 130 will be described to include bobbins 132 and coils 134.
  • the bobbin 132 may be omitted as necessary.
  • the bobbin 132 may be formed in the shape of a tube having a circular cross section, and the coil 134 is disposed in a state wound around the outer circumferential surface of the bobbin 132.
  • the voice coil part 130 is coupled to the reinforcement part 120 in this embodiment.
  • the support surface 122 of the reinforcement part 120 includes first to third support surfaces 122a, 122b, and 122c, and the second support surface will be described with reference to FIGS. 6 and 7.
  • 122b protrudes upward, and the first and third support surfaces 122a and 122c are formed in a downward direction from the second support surface 122b.
  • the second support surface 122b may be formed as a flat surface such as a horizontal plane. Accordingly, the bobbin 132 of the voice coil unit 130 is coupled to the second support surface 122b.
  • the voice coil unit 130 when the voice coil unit 130 is coupled to the reinforcement unit 120, as shown in FIG. 6, the inside and the outside of the voice coil unit 130 may be spaced by the voice coil unit 130. Are separated. Accordingly, when the diaphragm 100 is moved by the current applied to the voice coil unit 130, it may not be easy for air inside the voice coil unit 130 to be properly discharged to the outside. Air may be discharged between the voice coil part 130 and the reinforcement part 120 by the groove H formed while the 129 is formed.
  • the diaphragm 100 when the diaphragm 100 is vibrated while the voice coil unit 130 is coupled to the reinforcement unit 120, heat generated from the voice coil unit 130 may be easily discharged to the outside together with air. have.
  • the flow of air can be easily flowed, it is possible to smooth the vibration movement of the diaphragm 100 to improve the response speed of the diaphragm 100.
  • FIG. 9 is a view for explaining various examples for explaining the coupling relationship of the diaphragm according to an embodiment of the present invention.
  • FIG 9 (a) is a view showing that the diaphragm 110 and the reinforcement portion 120 of the diaphragm 100 according to the present embodiment is coupled, to illustrate that the diaphragm 110 and the reinforcement to be coupled
  • the unit 120 is spaced apart from the drawing.
  • the connecting portion 116 of the diaphragm 110 and the binding surface 124 of the reinforcement 120 are coupled.
  • the size of the connecting portion 116 and the binding surface 124 may be the same.
  • protrusions formed in the reinforcement part 120 are coupled to the diaphragm part 110.
  • FIG. 9 is a view showing that the binding surface 124 of the reinforcing portion 120 is larger than the connecting portion 116 of the diaphragm 110 in another embodiment.
  • the binding surface 124 of the reinforcement part 120 may have a size that may be applied to the connection surface 116 of the diaphragm part 110 and a part of the surround part 114. Accordingly, the binding surface 124 of the reinforcement part 120 may be coupled over the connection part 116 and the surround part 114 of the diaphragm part 110.
  • Figure 9 (c) is a view for explaining a coupling relationship with the reinforcement portion 120 when the center portion 112 and the surround portion 114 of the diaphragm 110 is manufactured separately in another embodiment. to be.
  • the central portion 112 may have a connection portion 116 disposed outside, and the surround portion 114 may have a separate connection portion disposed inside thereof. Accordingly, the central portion 112, the surround portion 114, and the reinforcement portion 120 are disposed in the upper portion in the lower portion, and the connection portion 116 of the central portion 112 and the connection portion and reinforcement portion 120 of the surround portion 114 are arranged.
  • the binding surface 124 of may be coupled in sequence.
  • the diaphragm 100 has been described.
  • the diaphragm 100 may be applied to speakers, earphones, or headphones, and may be used regardless of the size of the diaphragm 100.
  • the center part 112 and the surround part 114 included in the diaphragm 110 may be integrally formed, but may be manufactured separately and then coupled to each other as necessary.
  • the reinforcement part 120 has been described as being coupled to the lower part of the diaphragm part 110, but the reinforcement part 120 may be formed in the diaphragm part 110. It may be coupled to the top.
  • the central protrusion 126 and the plurality of auxiliary protrusions 128 formed on the reinforcement part 120 are supported in a lower direction opposite to the direction in which the first support surface 122a of the reinforcement part 120 protrudes, respectively. Protruding from the surface 122 may be formed.
  • the top surface of the central protrusion 126 and the plurality of auxiliary protrusions 128 may be coupled in surface contact with the upper surface of the central portion 112.
  • center portion 114 surround portion
  • connection portion 118 mounting portion
  • support surface 122a first support surface
  • center protrusion 126a center protrusion engagement surface

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

La présente invention concerne une membrane. Selon un mode de réalisation de la présente invention, cette membrane comprend : une partie membrane comprenant une partie centrale et une partie périphérique disposée de manière à entourer la partie centrale ; et une partie de renfort reliée à une surface de la partie centrale, cette partie de renfort comprenant une surface de support, destinée à supporter la partie de renfort, et au moins une partie saillante faisant saillie par rapport à la surface de support. Selon la présente invention, la partie de renfort peut être formée partiellement à travers la partie centrale et la partie périphérique de la partie membrane de telle sorte que la résistance et l'élasticité de la membrane soient accrues au maximum même lorsque la membrane est fabriquée au moyen d'un film mince de résine synthétique.
PCT/KR2019/005042 2018-04-26 2019-04-26 Membrane WO2019209062A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2018-0048638 2018-04-26
KR1020180048638A KR101948826B1 (ko) 2018-04-26 2018-04-26 진동판

Publications (1)

Publication Number Publication Date
WO2019209062A1 true WO2019209062A1 (fr) 2019-10-31

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS615094U (ja) * 1984-05-18 1986-01-13 シャープ株式会社 スピ−カ用振動板
JP3561954B2 (ja) * 1994-07-05 2004-09-08 松下電器産業株式会社 ダイナミックマイクロホン用振動板
US20060070796A1 (en) * 2002-11-21 2006-04-06 Koninklijke Philips Electronics N.V. Electroacoustic transducer comprising a memberane with a middle area comprising stiffening grooves
KR100824436B1 (ko) * 2007-12-26 2008-04-23 주식회사 예일전자 전자음향변환기의 진동판 및 그 진동판을 갖는전자음향변환기
US20140241567A1 (en) * 2013-02-25 2014-08-28 Apple Inc. Audio speaker with sandwich-structured composite diaphragm

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011071682A (ja) * 2009-09-25 2011-04-07 Hosiden Corp スピーカ用振動板およびスピーカ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS615094U (ja) * 1984-05-18 1986-01-13 シャープ株式会社 スピ−カ用振動板
JP3561954B2 (ja) * 1994-07-05 2004-09-08 松下電器産業株式会社 ダイナミックマイクロホン用振動板
US20060070796A1 (en) * 2002-11-21 2006-04-06 Koninklijke Philips Electronics N.V. Electroacoustic transducer comprising a memberane with a middle area comprising stiffening grooves
KR100824436B1 (ko) * 2007-12-26 2008-04-23 주식회사 예일전자 전자음향변환기의 진동판 및 그 진동판을 갖는전자음향변환기
US20140241567A1 (en) * 2013-02-25 2014-08-28 Apple Inc. Audio speaker with sandwich-structured composite diaphragm

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