EP0610001A2 - Lautsprecher - Google Patents

Lautsprecher Download PDF

Info

Publication number
EP0610001A2
EP0610001A2 EP94300426A EP94300426A EP0610001A2 EP 0610001 A2 EP0610001 A2 EP 0610001A2 EP 94300426 A EP94300426 A EP 94300426A EP 94300426 A EP94300426 A EP 94300426A EP 0610001 A2 EP0610001 A2 EP 0610001A2
Authority
EP
European Patent Office
Prior art keywords
diaphragm
bobbin
loudspeaker
voice coil
cellulose
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94300426A
Other languages
English (en)
French (fr)
Other versions
EP0610001B1 (de
EP0610001A3 (de
Inventor
Jun C/O Sony Corporation Kishigami
Masaru C/O Sony Corporation Uryu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of EP0610001A2 publication Critical patent/EP0610001A2/de
Publication of EP0610001A3 publication Critical patent/EP0610001A3/de
Application granted granted Critical
Publication of EP0610001B1 publication Critical patent/EP0610001B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • H04R7/125—Non-planar diaphragms or cones comprising a plurality of sections or layers comprising a plurality of superposed layers in contact

Definitions

  • the present invention relates to a loudspeaker. More particularly, the present invention relates to a loudspeaker having a diaphragm and a bobbin carrying a voice coil wound thereon.
  • the driving coil is magnetically connected to a magnetic circuit including a magnet and magnetic components and is placed in a uniform magnetic field. Consequently, if the current according to acoustic signals, such as voice signals, is allowed to flow through the driving coil, the bobbin is set into oscillations which are transmitted to the diaphragm for outputting the reproduced sound based on the acoustic signals.
  • the conical-shaped diaphragm for mid-to low-frequency sounds and the hemispherical-shaped dome diaphragm for high-frequency sound are commonly employed.
  • the diaphragm for low-frequency sound is mainly formed of paper, high molecular weight polymers such as polypropyline or polyethylene terephthalate or aluminum, while the diaphragm for high-frequency sound is mainly formed of paper, films of high molecular weight polymers such as polypropyline or polyethylene terephthalate cloths, or metallic materials.
  • the diaphragm is connected to a voice coil bobbin wound with the driving coil or voice coil.
  • the cone-shaped diaphragm has the apex of the cone as an opening to which the bobbin is bonded with an adhesive.
  • the dome-shaped diaphragm has an opening at a lower area of the hemisphere to which the bobbin is bonded with an adhesive.
  • the voice coil bobbin is usually formed of paper or aluminum.
  • the voice coil bobbin is driven into oscillations by changes in the acoustic current flowing through the driving coil. These oscillation are transmitted to the diaphragm.
  • the bobbin material is preferably lightweight and of higher toughness.
  • the voice coil bobbin is usually formed of paper or aluminum. If the bobbin is formed of paper, having the Young's modulus on the order of 1.5 to 2 (GPa) and being of low toughness, it is impossible to transmit the oscillations satisfactorily to the diaphragm. If the bobbin is formed of aluminum, the eddy current is generated in the voice coil bobbin due to electrical conductivity of the material to interfere with high fidelity reproduction.
  • the metal including aluminum or the high molecular material has a higher value of Q such that sufficient acoustic properties cannot be realized.
  • a loudspeaker having a diaphragm, a bobbin, a voice coil and a magnetic circuit.
  • the bobbin is connected to the diaphragm and is formed of cellulose produced by culturing bacteria.
  • the voice coil is mounted on the bobbin and a magnetic circuit is arranged for facing the voice coil.
  • a loudspeaker including a diaphragm, a voice coil and a magnetic circuit.
  • the diaphragm has a diaphragm proper and a bobbin.
  • the diaphragm proper and the bobbin are formed as one unit from cellulose produced by bacterial cultivation.
  • the voice coil is wound on the bobbin and the magnetic circuit is arranged facing the coil.
  • a plate member is also secured to the diaphragm proper.
  • the bobbin wound by the voice coil is formed of cellulose produced by bacterial cultivation
  • the bobbin is lightweight and improved in toughness, while having a lower Q value and a lower electrical conductivity.
  • the driving force of the diaphragm produced in the bobbin may be satisfactorily transmitted to the diaphragm, while the unusual sound proper to the bobbin material becomes less liable to be produced.
  • the loudspeaker may be provided which exhibits satisfactory acoustic characteristics from the low-frequency sound range up to the high-frequency sound range and high fidelity in sound reproduction.
  • Fig. 1 is a schematic cross-sectional view showing a loudspeaker according to a first embodiment of the present invention.
  • Fig. 2 is a cross-sectional view showing the structure of a diaphragm of a loudspeaker according to a second embodiment of the present invention.
  • Fig. 3 is a cross-sectional view showing the structure of a diaphragm of a loudspeaker according to a third embodiment of the present invention.
  • Fig. 4 is a cross-sectional view showing the structure of a diaphragm of a loudspeaker according to a fourth embodiment of the present invention.
  • Fig. 5 is a cross-sectional view showing the structure of a diaphragm of a loudspeaker according to a fifth embodiment of the present invention.
  • Fig. 6 is a cross-sectional view showing the structure of a diaphragm of a loudspeaker according to a sixth embodiment of the present invention.
  • Fig. 7 is a cross-sectional view showing the structure of a diaphragm of a loudspeaker according to a seventh embodiment of the present invention.
  • Fig. 8 is a cross-sectional view showing the structure of a diaphragm of a loudspeaker according to a seventh embodiment of the present invention.
  • Fig. 1 shows, in a schematic cross-sectional view, a loudspeaker having a cone-type diaphragm according to a first embodiment of the present invention.
  • the loudspeaker according to the first embodiment includes a conical-shaped diaphragm 1 having an opening la at an apex, a voice coil bobbin 3 which is a cylinder dimensioned to be fitted in the opening la and a voice coil 4 as a driving coil wound on the bobbin 3.
  • the diaphragm 1 and the bobbin 3 are bonded to each other at 1b and 3a such as with an adhesive.
  • the voice coil 4 is magnetically coupled to a magnetic circuit 2 and placed in a uniform magnetic field, so that, when the current based on acoustic signals is caused to flow in the voice coil 4, the voice coil bobbin 3 is excited into vibrations. As a result thereof, the vibrations of the bobbin 3 are transmitted to the diaphragm 1 for outputting the reproduced sound based on the acoustic signals.
  • the diaphragm 1 has its other end lc bonded at 5a to an edge member 4, and is connected via the edge member 5 to a frame 6.
  • a damper 7 is mounted between the magnetic circuit 2 and an upper portion of the voice coil bobbin 3 or the bonded portion of the diaphragm 1 to the voice coil bobbin 3.
  • the diaphragm 1 and the bobbin 3 are supported by the damper 7 and the edge member 3 for being oscillated in a vertical direction in Fig. 1.
  • the diaphragm 1 is formed of paper, high molecular material or aluminum
  • the voice coil bobbin 3 is formed of bacterial cellulose produced by culturing bacteria.
  • the bacterial cellulose is formed by highly crystalline ⁇ -cellulose and, because of its extremely high surface orientation characteristics, exhibits extremely high toughness. It is also tenuous, being 0.02 to 0.04 ( ⁇ m) in thickness. While differing with the manufacture methods, the Young's modulus of the bacterial cellulose is not less than 5 to 20 (GPa). Besides, the bacterial cellulose has a sharpness of resonance Q on the same order as that of paper.
  • the bacteria capable of producing the bacterial cellulose may be typified by acetic acid bacteria.
  • these bacteria include Acetobacter aceti, Acetobacter xylinum, Acetobacter rancens, Sarcina ventriculi, Bacterium xyloides, Acetobacter pasteurianus, Agrobacterium tumefacien and further the genus Pseudomonas and the genus Rhizobium.
  • the bacterial cellulose may be produced by a method of generating a thickened material of a certain thickness in an interface between air and the culture medium, or by aerated and agitated culturing.
  • U.S. Patent No. 4, 742, 164 As for the bacterial cellulose, reference is had to U.S. Patent No. 4, 742, 164.
  • the magnetic circuit 2 is made up of a yoke 2a having a center pole 2b, a permanent magnet 2c and a plate 2d, as shown in Fig. 1.
  • the upper end of the center pole 2b is introduced into the opening la.
  • an assembly of the bobbin 3 and the voice coil 4 is inserted into the gap defined between the center pole 2b and the plate 2d.
  • the voice coil 4 is positioned in a DC magnetic field of the magnetic circuit 2 and the alternating current based on the acoustic signals is supplied to the coil 4 to generate a driving force whereby the bobbin 3 is moved to and from in the oscillating direction, that is towards above and below in Fig. 1, as described above.
  • the frame 6 has its lower end secured to the upper surface of the plate 2d, while the damper 7 has its one end fastened to the frame 6, which in turn is secured to the plate 2d such as with an adhesive or set screws.
  • the voice coil bobbin is produced from the cellulose produced by the above mentioned bacteria in the following manner.
  • the cellulose as produced is processed into a liquid suspension in readiness for paper-making-like process.
  • the cellulose in the state of liquid suspension is processed by a paper-making-like process into a sheet-like member.
  • the sheet-like member containing the moisture, is dried and pressed with a heated press.
  • the sheet-like member, thus pressed and dried, is severed to bobbin blanks each having a suitable size.
  • the bobbin blanks as severed are wound on a cylindrical-shaped winding jig into a tubular form. With the bobbin blanks thus wound on the winding jig, a lead wire having an adhesive coated thereon is wound on the bobbin blanks.
  • junction areas of the as-severed bobbin blanks are bonded with an adhesive or the like.
  • the resulting assembly is heated and dried in this situation.
  • the adhesive coated on the surface of the lead wire is cured to bond the turns of the lead wire to one another while bonding the bobbin blanks to the lead wire.
  • the winding jig is extracted to complete the voice coil bobbin.
  • the above constitution of the loudspeaker may be applied to a loudspeaker having a dome-shaped diaphragm as shown in Fig. 2.
  • the loudspeaker of the present second embodiment includes a semi-circular diaphragm 11, having an opening 11a, a voice coil bobbin 13 which is a cylindrical-shaped member dimensioned to be fitted into the opening 11a and a voice coil 14 as a driving coil wound on the voice coil bobbin 13.
  • the diaphragm 11 is bonded to the bobbin 13 at llb and 13a to each other such as with an adhesive.
  • the operating state of the loudspeaker is the same as described in connection with the preceding first embodiment.
  • the diaphragm 11 is bonded at 15a to a damper 15 on a bonding surface llc thereof opposite to its surface having the bonded portion llb.
  • the damper 15 in turn is bonded to a stationary portion of the loudspeaker.
  • the diaphragm 11 is formed of paper, a film of a high molecular material, cloth or a metal material, while the coil bobbin 13 is formed of bacterial cellulose, as in the preceding first embodiment.
  • the voice coil bobbin was formed from bacterial cellulose and its characteristics were evaluated. Thus it was found that the formed product had a Young's modulus on the order of 10 (GPa) which is about five times that of paper commonly employed as the diaphragm material. The formed product also had the acuteness of resonance Q equal to 30 which is about one-tenth of that of aluminum commonly employed for the ordinary diaphragm. Since the loudspeaker of the present embodiment is higher in toughness and lower in the acuteness of resonance Q than the loudspeaker employing a voice coil bobbin formed of usual materials, such as paper or aluminum, it exhibits satisfactory acoustic characteristics and sound reproducibility of high fidelity over a broad range of frequency from the low-frequency range up to a high-frequency range.
  • the adhesive exhibits the toughness which is markedly different from that of the diaphragm or the voice coil bobbin. Since the oscillations of the voice coil bobbin are transmitted via the adhesive to the diaphragm, there is a risk that the oscillations cannot be transmitted correctly to the diaphragm, thus placing limitations in improving the fidelity in sound reproduction.
  • Figs. 3 and 4 illustrate the embodiments of the loudspeaker in which the diaphragm is formed as one with the voice coil bobbin.
  • Fig. 3 shows the third embodiment in which a cone type diaphragm is employed.
  • the loudspeaker of the present third embodiment includes a diaphragm 21 having the shape of a cone an apex of which is opened and extended in the form of a cylinder to form a cylindrical-shaped portion 21a, and a voice coil 23 as a driving coil wound about the cylindrical portion 21a.
  • the operation of the loudspeaker is the same as that of the previously described embodiments, that is, the cylindrical portion 21a, corresponding to the voice coil bobbin, is oscillated by changes caused in the acoustic current flowing in the driving coil 23.
  • the oscillations produced in the cylindrical-shaped portion 2la are transmitted to a cone-shaped vibrating portion 21b corresponding to the diaphragm for outputting the reproduced sound based on the acoustic signals.
  • the diaphragm 21 similarly to the previously described embodiments, similarly to the previously described embodiments, the diaphragm 21 has its other end bonded to an edge member 25 at 21a and 25a such as with an adhesive.
  • the diaphragm 21 of the present third embodiment is formed of bacterial cellulose.
  • the diaphragm and the cylindrical portion are formed as one from the bacterial cellulose, there is no portion from the diaphragm up to the cylindrical portion as the voice coil bobbin which is markedly different in toughness, so that the oscillations produced in the cylindrical portion may be transmitted more accurately to the diaphragm.
  • the dome type diaphragm may also be formed in the above-described manner.
  • the loudspeaker employing such diaphragm is shown in Fig. 4.
  • the loudspeaker of the present fourth embodiment comprises a diaphragm 31 in the form of a hemisphere an opening end of which is extended apart in the form of a cylinder to form a cylindrical portion 31a, and a voice coil 33 as a driving coil wound on the cylindrical portion 31a corresponding to the voice coil bobbin.
  • the operation of the loudspeaker according to the present fourth embodiment is the same as that of the preceding embodiments.
  • the diaphragm 31 is bonded to a damper 35 at 31c and 35c such as with an adhesive and is secured via the damper 35 to a stationary part of the loudspeaker, not shown.
  • the diaphragm 31 is formed of bacterial cellulose.
  • the loudspeaker having the dome-shaped diaphragm formed as one with the diaphragm from the bacterial cellulose may be suitably employed as a speaker for reproducing the high-frequency sound.
  • the loudspeaker including the diaphragm and the voice coil bobbin formed as one with each other is produced in the following manner.
  • the process up to the step of forming a sheet-like member from the cellulose produced by bacteria is the same as the process for producing the voice coil bobbin as described above and hence the corresponding description is not made herein for clarity.
  • the sheet-like member is placed on a carrier and the resulting sheet-like member / carrier unit is introduced into a cavity defined between convex and concave mold halves of a dome-shaped flash mold so as to be pressed by the flash mold and heated.
  • the concave mold half is formed of a high water permeability material permitting high water drainage and water contents are sucked by a vacuum pump simultaneously with drainage by the press.
  • the sheet-like member is molded after the shape of the mold.
  • the mold cavity defined between the convex and concave mold halves is so set as to conform to the cross-sectional shape of the diaphragm integrated to the bobbin in order to permit the cone or dome-shaped diaphragm to be molded integrally with the voice coil bobbin, as shown in Figs. 3 and 4. Since the bottom portion of the voice coil bobbin of the molded mass produced by the mold halves still remains solid, this bottom portion is machined for forming an opening therein. A winding jig is then introduced via the opening in the same manner as described previously in connection with the preparation of the voice coil bobbin.
  • a lead wire is placed around the portion which will prove to be the voice coil bobbin of the molded mass.
  • a diaphragm-voice coil bobbin assembly including the diaphragm molded as one with the portion of the molded mass which will prove to be the voice coil bobbin as shown in Figs. 3 and 4 is produced.
  • the foregoing description has been made of a one-layer diaphragm.
  • the loudspeaker having a multi-layer diaphragm of increased thickness such as the loudspeaker for mid- and low-frequency sounds, according to further embodiments of the present invention, is hereinafter explained.
  • each of the loudspeakers shown in Figs. 5 and 6 includes a diaphragm 41 having the shape of a cone an apex of which is opened and extended in the form of a cylinder to form a cylindrical portion 41a and a driving coil 43 wound on the cylindrical portion 41a.
  • the operation of the loudspeakers is the same as described above.
  • a second diaphragm material 46 is laminated on the outer wall of a conical portion 41b of the diaphragm 41.
  • the sixth embodiment shown in Fig.
  • a second diaphragm material 46 is laminated on the inner wall of the conical portion 41b of the diaphragm 41.
  • the diaphragm 41 in each of the fifth and sixth embodiments is formed of bacterial cellulose.
  • any of commonly employed diaphragm materials including paper, films of high molecular materials, mica or high strength fibers, such as carbon fibers or aromatic polyamides, may be employed. Of these diaphragm materials, paper exhibits satisfactory bonding properties with respect to the bacterial cellulose and hence is most preferred.
  • the outer edge of the diaphragm 41 is bonded to an edge member 45 which in turn is bonded to a frame, not shown. As a result thereof, the diaphragm 41 is supported for free oscillations by a stationary portion of the loudspeaker.
  • the second diaphragm 46 of paper may be provided on the conical portion 41b of the diaphragm 41 with the aid of an adhesive, as described above.
  • the second diaphragm may also be deposited by a method similar to the paper-making method.
  • the second diaphragm 46 of paper is formed in a cone shape as shown in Figs. 5 and 6 by the process similar to the paper-making process.
  • the second diaphragm 46 thus produced is transferred into a mold of a larger depth and the diaphragm 41 of bacterial cellulose is formed on the second diaphragm 46 by the process similar to the paper-making process.
  • the conical portion 41b of the diaphragm 41 is bonded to the second diaphragm 46 by the hydrogen bond.
  • the diaphragm may be increased in thickness by providing the second diaphragm 46 on the conical portion 41b of the diaphragm 41. Since the high-frequency range of frequency characteristics of the loudspeaker is extended in proportion to the cube of the diaphragm thickness, the diaphragm of an increased thickness is required for the mid to low-frequency sound.
  • the diaphragm shown in Figs. 5 or 6 not only the diaphragm 41 is increased in thickness by the provision of the second diaphragm 46 but also the high-frequency range of the frequency characteristics may be extended further by employing bacterial cellulose as the material for the diaphragm 41. Although it may be contemplated to produce a diaphragm of increased thickness using the bacterial cellulose, this method is not preferred because the paper-making-like process represents a time-consuming operation.
  • the properties required of the second diaphragm 46 include high longitudinal wave propagating velocity and a lower Q value. If paper is used as the material for the second diaphragm 46, the characteristics of the loudspeakers for the mid to low-frequency sound may be improved as compared to the case of employing the high strength fibers or mica because the second diaphragm 46 formed of paper may be bonded more satisfactorily to the first diaphragm 41 by the hydrogen bond. Besides, the second diaphragm 46 formed of paper is desirable in view of production costs.
  • Each of the loudspeakers shown in Figs. 7 and 8 includes a diaphragm 51 having the shape of a hemisphere the lower portion of which is opened and extended in the form of a cylinder to form a cylindrical portion 51a and a voice coil 53 as a driving coil wound on the cylindrical portion 51a.
  • the operation of the loudspeakers is the same as described above in connection with the second and fourth embodiments.
  • a second diaphragm material 56 is laminated on the inner wall of a hemispherical portion 51b of the diaphragm 51.
  • the eighth embodiment shown in Fig.
  • a second diaphragm material 56 is laminated on the outer wall of the hemispherical portion 51b of the diaphragm 51.
  • the diaphragm 51 in each of the fifth and sixth embodiments is formed of bacterial cellulose. Since the dome diaphragm is suited to a loudspeaker for the high-frequency sound, the second diaphragm 46 is preferably formed of metal materials, such as Ti or Al.
  • the diaphragm 51 is bonded to an edge member 45 which in turn is bonded to a stationary portion of the loudspeaker, not shown. As a result thereof, the diaphragm 51 is supported for free oscillations by the loudspeaker.
  • the high-frequency range of the frequency characteristics of the loudspeaker may be extended by virtue of the metallic material of the second diaphragm 46.
  • the acute peak of resonance generated in the high-frequency range of the frequency characteristics due to the use of the metallic material of the second diaphragm 46 may be alleviated by the use of the bacterial cellulose as the diaphragm material. If the loudspeaker shown in Figs.
  • a loudspeaker having satisfactory response characteristics may be realized because the rise time responsive to input signals is faster than with the use of materials other than the bacterial cellulose on account of the reduced weight of the diaphragm 51 itself and also because attenuation of the oscillations on sound interruption is incurred more quickly on account of the lower value of Q of the bacterial cellulose constituting the diaphragm 51.
  • the present invention may also be applied to a loudspeaker in which the diaphragm is bonded to the coil bobbin with an adhesive.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP19940300426 1993-01-29 1994-01-20 Lautsprecher Expired - Lifetime EP0610001B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP34330/93 1993-01-29
JP3433093 1993-01-29
JP3433093 1993-01-29

Publications (3)

Publication Number Publication Date
EP0610001A2 true EP0610001A2 (de) 1994-08-10
EP0610001A3 EP0610001A3 (de) 1995-01-18
EP0610001B1 EP0610001B1 (de) 2001-09-26

Family

ID=12411148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940300426 Expired - Lifetime EP0610001B1 (de) 1993-01-29 1994-01-20 Lautsprecher

Country Status (2)

Country Link
EP (1) EP0610001B1 (de)
DE (1) DE69428384T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110505564A (zh) * 2019-07-08 2019-11-26 惠州迪芬尼声学科技股份有限公司 一种音膜组装治具及其组装方法
US10708495B2 (en) 2017-06-06 2020-07-07 Yuyao Hengzheng Metal Ware Co., Ltd. Universal police loudspeaker

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3098880B1 (de) 2015-05-27 2019-02-27 Samsung Electronics Co., Ltd. Separator mit mikrobieller cellulose, verfahren zur herstellung des separators und verwendung des separators
CN107257530A (zh) * 2017-06-06 2017-10-17 余姚德诚科技咨询有限公司 智能化警车喇叭

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2933630A1 (de) * 1978-08-18 1980-02-28 Sony Corp Elektroakustischer wandler
DE3416674A1 (de) * 1983-05-10 1984-11-15 N.V. Philips' Gloeilampenfabrieken, Eindhoven Elektroakustischer wandler mit einer luftdurchlaessigen membran
EP0256743A2 (de) * 1986-08-04 1988-02-24 Matsushita Electric Industrial Co., Ltd. Membran für Lautsprecher
EP0457474A2 (de) * 1990-05-18 1991-11-21 Sony Corporation Verfahren zur Herstellung einer akustichen Membran

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2933630A1 (de) * 1978-08-18 1980-02-28 Sony Corp Elektroakustischer wandler
DE3416674A1 (de) * 1983-05-10 1984-11-15 N.V. Philips' Gloeilampenfabrieken, Eindhoven Elektroakustischer wandler mit einer luftdurchlaessigen membran
EP0256743A2 (de) * 1986-08-04 1988-02-24 Matsushita Electric Industrial Co., Ltd. Membran für Lautsprecher
EP0457474A2 (de) * 1990-05-18 1991-11-21 Sony Corporation Verfahren zur Herstellung einer akustichen Membran

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10708495B2 (en) 2017-06-06 2020-07-07 Yuyao Hengzheng Metal Ware Co., Ltd. Universal police loudspeaker
CN110505564A (zh) * 2019-07-08 2019-11-26 惠州迪芬尼声学科技股份有限公司 一种音膜组装治具及其组装方法

Also Published As

Publication number Publication date
EP0610001B1 (de) 2001-09-26
DE69428384D1 (de) 2001-10-31
EP0610001A3 (de) 1995-01-18
DE69428384T2 (de) 2002-06-13

Similar Documents

Publication Publication Date Title
CA1201798A (en) Electro-acoustic transducer having a diaphragm comprising a layer of polymethacrylimide foam
WO2003101148A1 (fr) Haut-parleur a bague de renforcement du diaphragme
EP1322136A2 (de) Plattenförmiger Schallabstrahler mit befestigtem Anreger und biegsamer Sicke
JP4148211B2 (ja) スピーカ装置
JP4363801B2 (ja) 圧電スピーカ
US6578661B2 (en) Speaker apparatus
EP0610001B1 (de) Lautsprecher
JPH1013988A (ja) スピーカ装置
JP3185510B2 (ja) スピーカー装置
US4803242A (en) Diaphragm for loudspeakers
GB2359213A (en) Elliptical dome loudspeaker
JP2005026920A (ja) スピーカ振動板およびスピーカ装置
CN101754075A (zh) 扬声器改良结构
WO2022000577A1 (zh) 扬声器
CN2513313Y (zh) 采用组合式振膜的动圈式扬声器
JPS643437B2 (de)
JPH09187094A (ja) スピーカ装置
CN108366322A (zh) 双磁路双音膜喇叭
CN221263972U (zh) 全频带双面扬声装置
CN208754549U (zh) 一种扬声器振动膜
CN2072300U (zh) 面驱动平板式扬声器
CN110677788B (zh) 一种发声模组及电子设备
JPH10164691A (ja) スピーカ
JP2004023297A (ja) コイルボビン及び導電性１ターンリング並びにスピーカ装置
CN111629311A (zh) 一种新型动圈式扬声器及制作方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19950623

17Q First examination report despatched

Effective date: 19980224

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 69428384

Country of ref document: DE

Date of ref document: 20011031

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20020110

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20020123

Year of fee payment: 9

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20020227

Year of fee payment: 9

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030801

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030930

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST