Metallic Material Patents (Class 181/168)
  • Patent number: 9402134
    Abstract: A stiffened diaphragm manufacturing method and the manufactured diaphragm using same are provided. The manufacturing method includes the steps of: applying a hot glue layer to a side of a stiffened plate; putting a base layer on the hot glue layer, and then heating and adhering the base layer and the stiffened plate together; and performing a pressing process on the base layer and the stiffened plate to form a diaphragm having a central portion and a surround portion. The stiffened plate is coated uniformly with the hot glue layer and then put on the base layer to undergo heating and adhesion; hence, an oversupply or undersupply of a glue will be unlikely to happen. Furthermore, the manufacturing process is simple and attains high-strength adhesion between the stiffened plate and the base layer.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: July 26, 2016
    Assignee: MERRY ELECTRONICS (SUZHOU) CO., LTD.
    Inventors: Chen-Mao Yang, Ching-Lan Lin, Po-Yu Chen, Yi-Lin Hsieh, Feng-Min Lai
  • Patent number: 9324315
    Abstract: The present invention relates to a type of vibrating membrane for speakers comprising the vibrating membrane body which comprises: A bottom layer used to reinforce the low frequency, a surface disposed on the said bottom layer, a composite metal layer used to ensure vibration uniformity, and a composite platy layer used for HF compensation disposed between the said bottom layer and the said composite metal layer. A type of speaker with the structure of the said vibrating membrane is also disclosed in the invention.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: April 26, 2016
    Assignee: INNOVATION SOUND TECHNOLOGY CO., LTD.
    Inventor: Shunming Yuen
  • Publication number: 20150075900
    Abstract: The present invention relates to a type of vibrating membrane for speakers comprising the vibrating membrane body which comprises: A bottom layer used to reinforce the low frequency, a surface disposed on the said bottom layer, a composite metal layer used to ensure vibration uniformity, and a composite platy layer used for HF compensation disposed between the said bottom layer and the said composite metal layer. A type of speaker with the structure of the said vibrating membrane is also disclosed in the invention.
    Type: Application
    Filed: June 4, 2012
    Publication date: March 19, 2015
    Inventor: Shunming Yuen
  • Patent number: 8903118
    Abstract: The present invention provides a dome diaphragm having high strength wholly and uniformly while maintaining a small thickness of a dome portion. A diaphragm 1 according to the present invention is a dome diaphragm including a dome portion 2. The dome portion 2 is divided into a plurality of small portions 4, and a ridge portion 7 is formed at a boundary of the small portions 4. In accordance with this configuration, the ridge portions 7 exist over the entire dome portion 2, and the ridge portions 7 can serve as frames for reinforcing the dome portion 2.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: December 2, 2014
    Assignee: TOA Corporation
    Inventors: Takeshi Fujita, Hiroshi Kubota
  • Patent number: 8863890
    Abstract: The invention relates to a speaker dome comprising: a polycrystalline diamond dome body formed of a material of high stiffness with a Young's modulus greater than 50 GPa and having respective inner and outer surfaces; and a coating on at least one side of the dome body, wherein the coating comprises an optically refractive metal compound layer which is semi-transparent and which forms one or more colors via interference of reflected light from front and rear surfaces of the layer. The invention also relates to a diamond component comprising: a diamond body; and a coating on at least one side of the diamond body, wherein the coating comprises at least two layers including a first layer bonded to the at least one side of the diamond body and a second layer disposed over the first layer, the second layer being an optically refractive metal compound coating which is semi-transparent and which forms one or more colors via interference of reflected light from front and rear surfaces of the second layer.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: October 21, 2014
    Assignee: Element Six Limited
    Inventors: Paul Nicholas Inglis, John Robert Brandon, Neil Perkins
  • Publication number: 20140158456
    Abstract: The invention relates to a speaker dome comprising: a polycrystalline diamond dome body formed of a material of high stiffness with a Young's modulus greater than 50 GPa and having respective inner and outer surfaces; and a coating on at least one side of the dome body, wherein the coating comprises an optically refractive metal compound layer which is semi-transparent and which forms one or more colours via interference of reflected light from front and rear surfaces of the layer. The invention also relates to a diamond component comprising: a diamond body; and a coating on at least one side of the diamond body; wherein the coating comprises at-least two layers including a first layer bonded to the at least one side of the diamond body and a second layer disposed over the first layer, the second layer being an optically refractive metal compound coating which is semi-transparent and which forms one or more colours via interference of reflected light from front and rear surfaces of the second layer.
    Type: Application
    Filed: February 7, 2012
    Publication date: June 12, 2014
    Applicant: ELEMENT SIX LIMITED
    Inventors: Paul Nicholas Inglis, John Robert Brandon, Neil Perkins
  • Patent number: 8718317
    Abstract: An electromagnetic device includes a housing, a planar coil disposed inside the housing, and a magnetic diaphragm disposed inside the housing, wherein the plane of the planar coil is substantially in parallel with the plane of the magnetic diaphragm, wherein the planar coil is separated from the magnetic diaphragm, and wherein the magnetic diaphragm is moveable in the presence of an exterior pressure.
    Type: Grant
    Filed: May 19, 2011
    Date of Patent: May 6, 2014
    Inventor: Zonghan Wu
  • Patent number: 8340341
    Abstract: A rigid three-dimensional component such as a speaker dome is formed of diamond, preferably fabricated to net shape by CVD diamond synthesis, and includes a coating on one or more major surfaces thereof. The coating is designed to enhance the performance and/or to alter the appearance of the component. In particular, the coating is designed to act as a damping medium and/or provide aesthetic qualities to the component.
    Type: Grant
    Filed: January 12, 2006
    Date of Patent: December 25, 2012
    Assignee: Element Six Limited
    Inventors: Neil Perkins, Charles Simon James Pickles, Christopher John Howard Wort, Geoffrey Alan Scarsbrook
  • Patent number: 8262824
    Abstract: A method for manufacturing electret diaphragms is provided. First, a dielectric film is attached to a frame by an adhesive material and a fastening element grips the peripheral area of the dielectric film on the frame. Afterward, the dielectric film is subjected to a metal sputtering process to form a conductive material layer thereon. Finally, the dielectric film is subjected to a polarizing process thereby forming an electret diaphragm.
    Type: Grant
    Filed: October 23, 2009
    Date of Patent: September 11, 2012
    Assignee: HTC Corporation
    Inventor: Fang Ching Lee
  • Patent number: 8235168
    Abstract: A speaker diaphragm is configured by a compound mixed with resin and bamboo fiber. The diaphragm satisfying the advantage of the bamboo fiber of high sound quality and a large degree of freedom in the setting of the characteristic value of the diaphragm and the advantage of the diaphragm made of a resin with improved humidity resistance reliability and strength, excellent external appearance, and enhanced productivity and dimension stability is obtained.
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: August 7, 2012
    Assignee: Panasonic Corporation
    Inventors: Yoshimichi Kajihara, Shinya Mizone, Kazuyoshi Mimura, Takashi Sabato, Kazuaki Nishimura
  • Patent number: 8230966
    Abstract: A speaker diaphragm is configured by a compound mixed with resin and bamboo fiber. The diaphragm satisfying the advantage of the bamboo fiber of high sound quality and a large degree of freedom in the setting of the characteristic value of the diaphragm and the advantage of the diaphragm made of a resin with improved humidity resistance reliability and strength, excellent external appearance, and enhanced productivity and dimension stability is obtained.
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: July 31, 2012
    Assignee: Panasonic Corporation
    Inventors: Yoshimichi Kajihara, Shinya Mizone, Kazuyoshi Mimura, Takashi Sabato, Kazuaki Nishimura
  • Patent number: 8177021
    Abstract: A speaker diaphragm is configured by a compound mixed with resin and bamboo fiber. The diaphragm satisfying the advantage of the bamboo fiber of high sound quality and a large degree of freedom in the setting of the characteristic value of the diaphragm and the advantage of the diaphragm made of a resin with improved humidity resistance reliability and strength, excellent external appearance, and enhanced productivity and dimension stability is obtained.
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: May 15, 2012
    Assignee: Panasonic Corporation
    Inventors: Yoshimichi Kajihara, Shinya Mizone, Kazuyoshi Mimura, Takashi Sabato, Kazuaki Nishimura
  • Patent number: 8122996
    Abstract: A speaker diaphragm is configured by a compound mixed with resin and bamboo fiber. The diaphragm satisfying the advantage of the bamboo fiber of high sound quality and a large degree of freedom in the setting of the characteristic value of the diaphragm and the advantage of the diaphragm made of a resin with improved humidity resistance reliability and strength, excellent external appearance, and enhanced productivity and dimension stability is obtained.
    Type: Grant
    Filed: December 20, 2007
    Date of Patent: February 28, 2012
    Assignee: Panasonic Corporation
    Inventors: Yoshimichi Kajihara, Shinya Mizone, Kazuyoshi Mimura, Takashi Sabato, Kazuaki Nishimura
  • Patent number: 7878297
    Abstract: A loudspeaker for acoustic enclosure, in particular a tweeter or a medium-frequency loudspeaker, which consists of a spherical diaphragm with direct radiation, with a front side that is concave in relation to the spool, and onto which is attached at a certain level, for example at mid-height or approximately at mid-height, the moving spool so as to achieve an optimal mechanical coupling capable of reproducing frequencies lower than 1 kHz with a high efficiency. Material such as pure beryllium or a Be/Al alloy or similar alloys is used to make the diaphragm. Loudspeakers of the tweeter or medium type, especially for very high-fidelity acoustic enclosures.
    Type: Grant
    Filed: February 4, 2009
    Date of Patent: February 1, 2011
    Assignee: Focal-JMLAB (S.A.)
    Inventors: Dominc Baker, Jacques Mahul
  • Publication number: 20100296687
    Abstract: The present invention provides a dome diaphragm having high strength wholly and uniformly while maintaining a small thickness of a dome portion. A diaphragm 1 according to the present invention is a dome diaphragm including a dome portion 2. The dome portion 2 is divided into a plurality of small portions 4, and a ridge portion 7 is formed at a boundary of the small portions 4. In accordance with this configuration, the ridge portions 7 exist over the entire dome portion 2, and the ridge portions 7 can serve as frames for reinforcing the dome portion 2.
    Type: Application
    Filed: March 5, 2008
    Publication date: November 25, 2010
    Applicant: TOA Corporation
    Inventors: Takeshi Fujita, Hiroshi Kubota
  • Publication number: 20100092023
    Abstract: A diaphragm for a speaker includes two portions. The first portion is made of metallic material for producing a high frequency tone. The second portion is made of a non-metallic material for producing a low frequency tone. The first portion is joined at a first peripheral edge to a voice coil while a second peripheral edge is joined at a first peripheral edge of the second portion to form the diaphragm.
    Type: Application
    Filed: January 12, 2007
    Publication date: April 15, 2010
    Applicant: SAMSON TECHNOLOGIES CORPORATION
    Inventors: Douglas Bryant, Michael A. Ketchell
  • Publication number: 20090304225
    Abstract: The present invention provides a dome-shaped diaphragm fabricated based on a film base of polyethylene terephthalate resin film. The diaphragm includes a first vibrating part of a dome shape or a flat shape, and a second vibrating part of an annular shape. The second vibrating part includes a peripheral portion of the film base provided around a central portion of the film base. The first vibrating part includes the central portion of the film base, a thermosensitive adhesive resin film, provided on the central portion, and a fiber sheet made of a woven fabric using carbon fiber or an embossed nonwoven fabric. The fiber sheet is layered over the central portion with the thermosensitive adhesive resin film interposed therebetween.
    Type: Application
    Filed: May 12, 2009
    Publication date: December 10, 2009
    Applicant: HOSIDEN CORPORATION
    Inventors: Tomohiko KAMIMURA, Hideo Yuasa, Masahito Ikeda
  • Publication number: 20090200101
    Abstract: A loudspeaker for acoustic enclosure, in particular a tweeter or a medium-frequency loudspeaker, which consists of a spherical diaphragm with direct radiation, with a front side that is concave in relation to the spool, and onto which is attached at a certain level, for example at mid-height or approximately at mid-height, the moving spool so as to achieve an optimal mechanical coupling capable of reproducing frequencies lower than 1 kHz with a high efficiency. Material such as pure beryllium or a Be/Al alloy or similar alloys is used to make the diaphragm. Loudspeakers of the tweeter or medium type, especially for very high-fidelity acoustic enclosures.
    Type: Application
    Filed: February 4, 2009
    Publication date: August 13, 2009
    Applicant: FOCAL-JMLAB (S.A.)
    Inventors: Dominc Baker, Jacques Mahul
  • Patent number: 7467686
    Abstract: On one surface of a piece of wooden sheet, a cloth or paper is adhered to make an adhered sheet. An approximately V-shaped notch is provided on the adhered sheet, the adhered sheet is wetted to be softened, and a lubricant which acts to keep water is impregnated thereinto. Edge portions of the notch are overlapped, and the adhered sheet is tentatively molded in an approximately horn shape by a first hot press molding. The adhered sheet is then dried, impregnated with thermosetting resin, and half-dried. The adhered sheet is subject to a second hot press molding. A moisture-proof agent is applied on the adhered sheet, a center hole for a voice coil and periphery are removed to make a speaker diaphragm having a predetermined dimension and shape.
    Type: Grant
    Filed: February 17, 2004
    Date of Patent: December 23, 2008
    Assignee: Victor Company of Japan, Limited
    Inventors: Satoshi Imamura, Takeshi Hirano, Tomoaki Ogata, Toshikatsu Kuwahata
  • Patent number: 7280668
    Abstract: This invention provides a method of manufacturing speaker diaphragm for a loudspeaker that has a composite material formed of two layers of ceramic material separated by a light metal substrate and where the core is formed by stamping a sheet of standard gauge aluminum to form a speaker core and then deep anodizing the core to obtain a ceramic layer of alumina on each surface (Al2O3) that is at least about 1 mil. thick. The invention further provides for a loudspeaker diaphragm, where the diaphragm is a composite material formed of at least two layers of ceramic material having a metal substrate therebetween and where the thickness of the metal substrate is no more than 86% of the thickness of the composite material.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: October 9, 2007
    Assignee: Harman International Industries, Incorporated
    Inventors: Allan O. Devantier, An D. Nguyen
  • Patent number: 6929092
    Abstract: A speaker diaphragm that has a high heat-radiation efficiency. The speaker diaphragm includes a diaphragm main body made from a resin, and a metallic plate adhered to a major acoustic surface of the diaphragm main body adjacent a voice coil bobbin. The voice coil bobbin is attached to the diaphragm man body.
    Type: Grant
    Filed: October 10, 2001
    Date of Patent: August 16, 2005
    Assignees: Pioneer Corporation, Tohoku Pioneer Corporation
    Inventors: Yasuhisa Abe, Takashi Suzuki, Koji Matsumoto, Koji Takayama
  • Patent number: 6920230
    Abstract: An electromagnetic transducer includes: a first diaphragm; a second diaphragm provided in a central portion of the first diaphragm, the second diaphragm comprising a magnetic material having a first opening in a central portion thereof; a yoke disposed so as to oppose the first diaphragm; a center pole disposed between the yoke and the first diaphragm, wherein the center pole has a shape which allows insertion into the first opening; a coil disposed so as to surround the center pole; and a first magnet disposed so as to surround the coil.
    Type: Grant
    Filed: April 16, 2001
    Date of Patent: July 19, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Sawako Usuki, Shuji Saiki
  • Patent number: 6814181
    Abstract: There is provided an electrically conductive damper device for a speaker in which local bending is reduced and break-downs of material of the damper and metallic wires incorporated in the damper are prevented, by additionally providing one or more sheets of damper fabric as a reinforcing damper 142 and by bonding it to a main damper 141 by way of various kinds of resin, in order to reinforce a neck portion of the electrically conductive damper. Further, properties of the damper can be adjusted by varying an outer diameter of the reinforcing damper 142, or by selecting the resin to be employed as an adhesive.
    Type: Grant
    Filed: October 22, 2001
    Date of Patent: November 9, 2004
    Assignees: Pioneer Corporation, Tohoku Pioneer Corporation
    Inventors: Yasuhisa Abe, Koji Matsumoto, Koji Takayama, Hiroyuki Tomiyama
  • Patent number: 6804371
    Abstract: A speaker includes a housing having a diffusion opening provided with a laser vibration diaphragm. The laser vibration diaphragm has reflective spatial patterns, so that the speaker may present multiple-image variations under different rays of light, thereby enhancing a viewing effect and aesthetic quality of the speaker. Thus, the laser vibration diaphragm may produce spatial variations by the difference of incident angles of the light, thereby obtaining a viewable strong sensation to the people, and thereby enhancing the viewing effect and aesthetic quality of the speaker.
    Type: Grant
    Filed: August 13, 2002
    Date of Patent: October 12, 2004
    Inventors: Mu-Sheng Liu, Long-Zheng Zhu, Ta-Yan Peng
  • Patent number: 6658326
    Abstract: A noise reduction system reduces noise associated with an input signal provided to a control system, while substantially minimizing the adverse affect on the responsiveness and stability of the control system. The noise reduction system includes a processor, a memory subsystem and processor executable code. The processor executable code causes the processor to perform a number of steps. Initially, the processor determines an input signal level of an input signal at an input of a noise reduction system. Next, the processor determines an output signal level of an output signal at an output of the noise reduction system. The processor then determines a magnitude of a difference signal which is the difference between the input signal level and the output signal level. When the magnitude of the difference signal is less than a predetermined noise limit, the input signal is provided to an input of a control system.
    Type: Grant
    Filed: February 22, 2001
    Date of Patent: December 2, 2003
    Assignee: Delphi Technologies, Inc.
    Inventor: David J. Trapasso
  • Patent number: 6634456
    Abstract: A kind of vibrating diaphragm of false speaker structure which includes a center piece with integrated formation directly on a larger outer diameter surface layer body, a connected suspended edge provided at the side way of the surface layer body in circle, and the hardness of the center piece is greater than the surface layer body and a gap reserved at the separation of the formation of the surface layer body and the suspended edge; with this provision, it provides aesthetic and consistence in appearance to the vibrating diaphragm formation, and save the adhesion of the suspended edge and the center piece which reduce the process and lower cost and make the center piece embedded with the product firmly without loosen, meeting various test condition and prolong the service life of the structure in practice.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: October 21, 2003
    Assignee: Meiloon Industrial Co., Ltd.
    Inventor: Jack Peng
  • Patent number: 6394224
    Abstract: A speaker structure having a supporting base with a magnetic circuit in a lower portion, a sound cylinder with a tube with wires on one end, which one end is placed in the magnetic circuit and the other end is higher than the supporting base. A vibration diaphragm having a round concave shape covers the top of the sound cylinder. A flexible free end fixture with a wave transmission in the middle section has one end connected to the supporting base and the other end directly connected to the tube of the sound cylinder. Thus favorable movement flexibility is achieved by the adhesion of the free end fixture at the lateral side of the sound cylinder. The space above the sound cylinder is vacant to independently install a vibration diaphragm with an enlarged area to effectively enhance the output of sound pressure.
    Type: Grant
    Filed: March 30, 2000
    Date of Patent: May 28, 2002
    Inventor: Chun-I Liu
  • Publication number: 20020046900
    Abstract: A speaker diaphragm that has a high heat-radiation efficiency. The speaker diaphragm includes a diaphragm main body made from a resin, and a metallic plate adhered to a major acoustic surface of the diaphragm main body adjacent a voice coil bobbin. The voice coil bobbin is attached to the diaphragm man body.
    Type: Application
    Filed: October 10, 2001
    Publication date: April 25, 2002
    Applicant: Pioneer Corporation and Tohoku Pioneer Corporation
    Inventors: Yasuhisa Abe, Takashi Suzuki, Koji Matsumoto, Koji Takayama
  • Patent number: 6364966
    Abstract: A method for manufacturing an acoustic vibration plate includes molding titanium metal into a shape of an acoustic vibration plate in order to obtain a titanium vibration plate, and performing a heat treatment on the titanium vibration plate by a ceramic-formation step, thereby to change entirely the titanium vibration plate into titanium oxide.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: April 2, 2002
    Assignee: Sony Corporation
    Inventors: Yoshio Ohashi, Masaru Uryu
  • Patent number: 6327372
    Abstract: A speaker diaphragm for a loudspeaker that has a composite material formed of two layers of ceramic material separated by a light metal substrate with the percentage ratio of the thickness of the ceramic layers to the light metal substrate being in the range of from about 10% to 45% for each ceramic layer and a corresponding 80% to 10% for the lightweight metal substrate.
    Type: Grant
    Filed: January 5, 1999
    Date of Patent: December 4, 2001
    Assignee: Harman International Industries Incorporated
    Inventors: Allan O. Devantier, An D. Nguyen
  • Patent number: 6275598
    Abstract: The invention presents a sound reproduction device which operates in accordance with the flexural wave principle. Such devices have in common that a panel 10 is provided in which flexural waves are produced by a drive arrangement 16. The drive arrangements 16 in the state of the art are connected to one of the surfaces of the panel 10 and are held by a support structure which functions as a countersupport. Such support structures either hinder the propagation of the flexural waves along the surface of the panel 10 and/or lead to an increase in the constructed depth of such a sound reproduction device. To avoid these disadvantages of the state of the art, the drive system 16 is located in a cutout 15 of the panel 10.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: August 14, 2001
    Assignee: Harman Electronic Systems GmbH
    Inventors: Wolfgang Bachmann, Gerhard Krump, Hans-J├╝rgen Regl
  • Patent number: 5796054
    Abstract: A loudspeaker diaphragm is provided as an injection molded material including 50 to 80 weight % of a matrix resin of polyolefins and 20 to 50 weight % of flaky mica having an average aspect ratio of more than 10 and including at least 3 weight % or more of pearl mica. The matrix resin of polyolefins includes respective flakes of the flaky mica orientated in parallel to thereby improve the acoustic characteristics and concurrently the design appearance of the diaphragm. The design appearance of the diaphragm can have bright colors and a pearly luster.
    Type: Grant
    Filed: April 9, 1997
    Date of Patent: August 18, 1998
    Assignees: Foster Electric Co., Ltd., Nihon Koken Kogyo Co., Shiseido Co., Ltd.
    Inventors: Fumiteru Shingu, Kiyotaka Miyashita, Kouichi Ogawa, Akira Kose, Asa Kimura
  • Patent number: 5406038
    Abstract: Briefly, according to the invention, there is provided a shielded speaker. The speaker (10) has a diaphragm (18) coated with a metal layer (28). The coated diaphragm prevents the transmission of unwanted electromagnetic or radio frequency radiation from the front side (22) of the speaker to the rear side (24) of the speaker. In an alternate embodiment of the invention, a shielded electronic device is provided. The device consists of a housing (40) that has an opening (42) for a speaker (10) and a shielding means (44) contained within the housing. The speaker has a diaphragm coated with a metal layer. Disposed within the housing is an electronic device that is susceptible to or emits electromagnetic radiation. The electronic device (46) is coupled to the speaker and the speaker is mounted in the housing such that the metal layer is electrically coupled (48) to the shielding means.
    Type: Grant
    Filed: January 31, 1994
    Date of Patent: April 11, 1995
    Assignee: Motorola, Inc.
    Inventors: David E. Reiff, Mac W. Branan
  • Patent number: 5251188
    Abstract: A sonic transducer (10) includes an elongated diaphragm (12) secured to a base (14) by a clamping member (16). The shapes of the surfaces (26, 30) by which the base (14) and clamping element (16) engage the diaphragm (12) are different at the end regions (28) from what they are in the side regions (32). The result is a more-rigid clamping at the ends than at the sides, which causes the lengthwise and widthwise stiffnesses of the diaphragm to be more nearly equal and thus the sound production from various regions of the diaphragm to be more nearly in phase than they would be if the clamping were uniform.
    Type: Grant
    Filed: April 13, 1992
    Date of Patent: October 5, 1993
    Assignee: Recurrent Solutions Limited Partnership
    Inventors: Natan E. Parsons, Joel S. Novak
  • Patent number: 5135582
    Abstract: The present invention is directed to a method for producing a diaphragm for highly brittle metals used in loudspeakers, comprising a step of making a laminated plate by stacking a plate of superplastic material on a plate of highly brittle metal. The laminated plate is arranged on a mould, and the laminated plate is heated to a predetermined range of temperatures, determined according to the highly brittle metal. Subsequently, the laminated plate is deformed by pressuring the laminated plate in the mould, at the range of temperatures. Thus, a diaphragm can be formed from a plate of highly brittle metals, without causing brittle fracture or generating internal or surface defects.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: August 4, 1992
    Assignee: Yamaha Corporation
    Inventors: Osamu Mochizuki, Toshiharu Hoshi
  • Patent number: 5080743
    Abstract: A process for preparing a wholly carbonaceous integrated diaphragm for acoustic equipment use comprises blending under application of high shearing force a mixture of one or more kinds of organic high polymeric substances carbonizable on baking and powder of graphite with crystals high elastic modulus developed therein; extrusion-molding the uniformly blended and dispersed mixture through a profile extrusion die to give a core material with orientation along the direction of the extrusion and to be cut to a desired form; independently blending and sheeting under application of high shearing force the mixture with the organic powder oriented to high degree parallel to the direction of the surface of the sheet and further passing the sheet through a calendering roll to give a skin material in the form of a film or sheet; bonding said skin material on both sides of the core material by the use of such organic liquid composition that provides high yield of carbon residue on baking and then baking the resulting un
    Type: Grant
    Filed: January 16, 1990
    Date of Patent: January 14, 1992
    Assignee: Mitsubishi Pencil Co., Ltd.
    Inventor: Hideo Odajima
  • Patent number: 4726443
    Abstract: A diaphragm using a metal material applied with anodic oxide films, in which said metal material contains one of lead compounds, inorganic metal compounds and phosphor compounds at least to a portion in the micropores of the anodic oxide film.
    Type: Grant
    Filed: October 3, 1985
    Date of Patent: February 23, 1988
    Assignee: Sony Corporation and Fujikura Ltd.
    Inventors: Masana Ugaji, Shinichi Watanabe, Hiroyuki Sogawa, Nobuo Fuke, Masatsugu Maejima, Koichi Saruwatari
  • Patent number: 4713277
    Abstract: A foamed metal which has an apparent specific gravity of from 0.2 to 0.8 and comprises an aggregate of polygonal closed cells of from 2 to 10 mm in average diameter. The foamed metal is not only light in weight, free of directionality and structurally strong but also excellent in sound-absorbing and electromagnetic shielding properties, and is useful as constructional, structural or functional material. A method for producing the foamed material comprises adding calcium as a thickening agent to molten aluminum or alloy thereof in an amount of from 0.2 to 8% by weight, followed by agitating to adjust the viscosity of the melet, then adding from 1 to 3% by weight of powdered titanium hydride as a foaming agent to the melt, and agitating the melt to effect foaming.
    Type: Grant
    Filed: July 18, 1986
    Date of Patent: December 15, 1987
    Assignees: Agency of Industrial Science and Technology, Shinko Kosen Kogyo Kabushiki Kaisha
    Inventors: Shigeru Akiyama, Hidetoshi Ueno, Koji Imagawa, Akira Kitahara, Sumio Nagata, Kazuo Morimoto, Tooru Nishikawa, Masao Itoh
  • Patent number: 4709392
    Abstract: A dome speaker comprising a dome-shaped diaphragm formed of a highly rigid material such as titanium or a titanium alloy, and having at least one elongated cut-out portion which varies the rigidity of the diaphragm and prevents a dip in the anti-resonance frequency range and a peak in the high resonance frequency range of the dome speaker. The speaker also includes a voice coil bobbin connected to the diaphragm. Preferably, the diaphragm includes two elongated cut-out portions in parallel relation to each other and with a center portion of the diaphragm interposed therebetween. A reinforcing rib may be integrally formed at an end of each cut-out portion. The cut-out portion may be covered either by a peripheral member made of a soft material or by a loss stopper formed of a viscoelastic material.
    Type: Grant
    Filed: February 28, 1985
    Date of Patent: November 24, 1987
    Assignee: Onkyo Kabushiki Kaisha
    Inventors: Toshiji Kato, Tatsuya Omori
  • Patent number: 4655316
    Abstract: An acoustic diaphragm is made of metallic sheet material forming a raised pattern of the material and unraised sectors of the material. The diaphragm is of the dome-shaped variety. The raised pattern incorporates sets of raised strip elements. There is a set of such elements extending radially from the vicinity of the apex. There is a set extending along areas of the sheet material between the radially extending elements, this second set including pairs of strip elements which intersect one another along such areas. There is also a set of circumferentially extending raised strip elements. The form of the radially extending elements changes along their lengths; for example, they rise to levels which vary along their lengths.
    Type: Grant
    Filed: March 13, 1985
    Date of Patent: April 7, 1987
    Assignee: JBL Incorporated
    Inventor: Fancher M. Murray
  • Patent number: 4518443
    Abstract: An acoustic diaphragm formed of beryllium or an alloy composed mainly of beryllium. Said diaphragm has a crystal structure having its plane (1120) preferentially orientated in parallel with the surface of the diaphragm.
    Type: Grant
    Filed: May 20, 1983
    Date of Patent: May 21, 1985
    Assignee: Pioneer Electronic Corporation
    Inventors: Shinichi Yokozeki, Masami Kimura, Tsunehiro Tsukagoshi
  • Patent number: 4512435
    Abstract: The present invention is directed to a diaphragm for loudspeakers which is integrally constructed through the combination of a core material being formed as a disc-shaped solid construction through the independent or series of combination of a plurality of flat-plate pieces and disc-shaped skin materials each being approximately equal in diameter on the top face and the bottom face of disc-shaped core material, the core material and skin materials being made of either boron or beryllium, thus resulting in the higher efficiency, wider zone and lower distortion of the loudspeakers.
    Type: Grant
    Filed: March 16, 1983
    Date of Patent: April 23, 1985
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroshi Takeuchi, Yoshiaki Maruno
  • Patent number: 4484383
    Abstract: A multi-layer block to be developed into a disk having a honeycomb construction is initially developed into a columnar block, and then the bottom of the columnar block is radially developed for obtaining a core of a speaker diaphragm. A suitable circular thin layer is attached to the top and bottom of the core to complete a diaphragm. The columnar block may be developed by means of a cone-shaped tool into a truncated cone, and this truncated cone may be further developed into a flat disk by applying a force to the top thereof. Since the forces on development are applied to the block uniformly, the density of hexagonal sections of the honeycomb construction is uniform throughout the entire circumference of the core providing superior speaker characteristics.
    Type: Grant
    Filed: June 21, 1982
    Date of Patent: November 27, 1984
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Takewa, Katsuaki Satoh, Seiichi Ishikawa
  • Patent number: 4470479
    Abstract: A speaker diaphragm of the present invention is prepared in a manner such that a boron layer is formed on one face of a dome-shaped metal foil by means of a physical vapor deposition method such as ion-plating, cathode sputtering, vacuum evaporation or the like, when necessary the metal foil is thinned by etching, and then, if necessary, another boron layer is formed on the other face of the metal foil. Alternatively, a metal layer is formed on the surface of the boron layer. The resultant speaker diaphragm is light in weight and high in modulus and also has appropriate internal mechanical resistance against vibration, thereby providing a speaker of high efficiency and satisfactory characteristics.
    Type: Grant
    Filed: December 28, 1979
    Date of Patent: September 11, 1984
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hideaki Inoue, Hiroshi Takeuchi, Hidetsugu Kawabata, Keizo Ishiwatari
  • Patent number: 4461930
    Abstract: An acoustic transducer having a honeycomb-type diaphragm material, which transducer comprises a piezoelectric element and a driving element supported within a housing frame and acoustically attached by a coupling means to a honeycomb-type diaphragm, flat sheet material having a high stiffness-to-weight ratio, to provide an acoustic transducer having an efficient, well-dispersed, frequency response of shallow design and improved heat conductivity.
    Type: Grant
    Filed: September 23, 1982
    Date of Patent: July 24, 1984
    Assignee: Pioneer Speaker Components, Inc.
    Inventors: Louis Melillo, Tsutomu Haga, Iwao Sashida
  • Patent number: 4351411
    Abstract: A speaker device which comprises a diaphragm made of synthetic resin. The diaphragm is formed by injection molding and is plated with metal on both surfaces thereof for enhancing the rigidity against bending. The diaphragm is capable of vibrating as a whole, without making a wavy movement in the axial direction as if the entirety were a rigid matter, with a result of producing a loud and clear sound without any distortion or strain.
    Type: Grant
    Filed: May 27, 1980
    Date of Patent: September 28, 1982
    Inventor: Kenzo Inoue
  • Patent number: 4344503
    Abstract: A diaphragm for electro-acoustic transducer which, as a component member, utilizes a layer of ceramics material, by which the E/.rho. ratio of the diaphragm can be increased, leading to an elevated resonance frequency of the diaphragm, whereby the limit frequency for reproducting of high-pitch sound can be shifted high, thus making it possible to widen the range of piston motion of the diaphragm, and to thereby improve its frequency characteristic. Also, a diaphragm utilizing a composite board formed by lamination of a layer of ceramics material and a layer of light-weight metal eliminates the fragility of diaphragm would entail when the diaphragm utilizes a single layer of a ceramics material alone, and thus the handling of the diaphragm is facilitated.
    Type: Grant
    Filed: January 23, 1981
    Date of Patent: August 17, 1982
    Assignee: Nippon Gakki Seizo Kabushiki Kaisha
    Inventors: Akira Nakamura, Takao Nakaya
  • Patent number: 4315557
    Abstract: A diaphragm for electro-acoustic transducer comprising a core member of honeycomb structure made of either a thin film of a metal or a high molecular material, and a skin member bonded to at least one side of this honeycomb core structure and being prepared by the use of aromatic polyamide fibers having a high tensile strength, a high Young's modulus and a high Young's modulus-to-weight ratio and reinforced by a thermo-setting resin. Such diaphragm has a high Young's modulus, an improved mechanical strength and a wide frequency range of piston motion, and presents reduced distortion throughout a wide frequency range, and has a superior transition characteristic, whereby a good sound reproduction characteristic is obtained.
    Type: Grant
    Filed: May 29, 1980
    Date of Patent: February 16, 1982
    Assignee: Nippon Gakki Seizo Kabushiki Kaisha
    Inventors: Takao Nakaya, Akira Nakamura
  • Patent number: 4254184
    Abstract: A vibrating member made of a thin metal plate and adapted to be used in an acoustic transducer such as a loudspeaker or microphone is diffused at least partially with an inorganic substance to improve the acoustic characteristics thereof, particularly the high frequency range.
    Type: Grant
    Filed: May 28, 1976
    Date of Patent: March 3, 1981
    Assignee: Pioneer Electronic Corporation
    Inventors: Tsunehiro Tsukagoshi, Shin-ichi Suzuki, Hitomi Ogino
  • Patent number: 4216271
    Abstract: A composite diaphragm for a speaker comprises a boron layer formed on a metal foil such as titanium foil, in which a layer of a low melting point metal such as aluminum or magnesium is interposed between the metal foil and the boron layer to provide high rigidity, high elasticity and high bonding strength between the metal foil and the boron layer.
    Type: Grant
    Filed: November 3, 1977
    Date of Patent: August 5, 1980
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroshi Takeuchi, Hideaki Inoue, Hidetsugu Kawabata, Keizo Ishiwatari