EP0062600A1 - Haut-parleur électrodynamique pour fréquences sonores basses et moyennes - Google Patents

Haut-parleur électrodynamique pour fréquences sonores basses et moyennes Download PDF

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Publication number
EP0062600A1
EP0062600A1 EP82710017A EP82710017A EP0062600A1 EP 0062600 A1 EP0062600 A1 EP 0062600A1 EP 82710017 A EP82710017 A EP 82710017A EP 82710017 A EP82710017 A EP 82710017A EP 0062600 A1 EP0062600 A1 EP 0062600A1
Authority
EP
European Patent Office
Prior art keywords
membrane
loudspeaker according
plates
membranes
loudspeaker
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
EP82710017A
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German (de)
English (en)
Other versions
EP0062600B1 (fr
Inventor
Siegfried Dr. Klein
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.)
Individual
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Individual
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 Individual filed Critical Individual
Priority to AT82710017T priority Critical patent/ATE14062T1/de
Publication of EP0062600A1 publication Critical patent/EP0062600A1/fr
Application granted granted Critical
Publication of EP0062600B1 publication Critical patent/EP0062600B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/227—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  using transducers reproducing the same frequency band

Definitions

  • the invention relates to an electrodynamic loudspeaker for low and medium sound frequencies with a movable membrane and with a voice coil connected to this membrane, which is arranged in the area of an air gap of a magnet arrangement with permanent magnets and through which a current can flow. This is the electrical signal that is to be converted into audible sound.
  • the membrane In the known loudspeaker of this type, the membrane is either funnel-shaped or dome-shaped or dome-shaped. If it is vibrated, it emits sound in one preferred direction. It follows that for a good stereophonic or quadrophone sound reproduction, the known loudspeakers must be aligned in such a way that the sound waves emitted by them converge at a point or a listening area in which the listener should be. This leads to disadvantages and limitations, firstly with regard to the positioning possibilities of the loudspeakers, secondly with regard to the number of listeners who can be at the preferred listening location and thirdly in cooperation with other loudspeakers, in particular tweeters.
  • the known loudspeakers have to be accommodated in boxes which are designed, for example, as a closed box or as a bass reflex box and, if necessary, have carefully thought-out acoustic shields or attenuators in order to avoid an acoustic short circuit with the sound waves emitted from the rear of the membrane.
  • the known loudspeaker arrangements in boxes are therefore often bulky and their price also lies relatively high because of the box.
  • the total acoustic power of a loudspeaker is proportional to the radiating surface, the square of the deflection of the membrane (elongation) and the square of the frequency.
  • the membrane essentially acts like a piston, the radiating surface of which is proportional to the square of the diameter of the circle which the outer edge of the membrane describes. Accordingly, the amplitude of the membrane movement (elongation) must be large at low sound frequencies and for a given diameter of the membrane in order to achieve a high acoustic switching power.
  • the object of the present invention is to avoid the disadvantages of the known loudspeakers and to provide an electrodynamic loudspeaker of the type mentioned at the outset which emits essentially in all directions and, for a predetermined diameter of the membrane, makes it possible to achieve a significantly greater acoustic switching power than the known speakers with the same paths of the membrane, or a smaller diaphragm stroke than the known speakers with the same acoustic sound power required.
  • An acoustic short circuit is excluded according to the invention because the sound pressure fluctuations emanating from the rear sides of the two membranes cannot reach the outside, but rather remain within the closed body, where they can be absorbed by suitable material.
  • the two transmission parts advantageously have the Form of a hollow spherical shell, which is attached with its highest point to the voice coil and with its circular edge to the associated membrane.
  • Such a loudspeaker behaves like a pulsating ball when excited by an applied electrical signal and sends the sound waves practically without a preferred direction evenly in all directions.
  • the radiating surface of this loudspeaker is essentially the same as the surface of the sphere formed by the two membranes. Therefore, for a given diameter, the total acoustic power of the loudspeaker according to the invention is approximately four times as high as that of a loudspeaker with a funnel membrane with the same movement strokes of the compared membranes.
  • the membrane of the loudspeaker according to the invention compared to a funnel membrane of a known loudspeaker is sufficient to obtain the same acoustic sound power.
  • the diaphragms of the loudspeaker according to the invention despite their relatively large diameter, have a high mechanical rigidity due to their shape.
  • the loudspeaker according to the invention can simply be suspended using a suitable fastening device, for example hanging from an arm or a console, or can be carried by a frame.
  • the loudspeaker shown in FIG. 1 has two substantially hemispherical membranes 1, 2, which are each connected to voice coils 3, 4.
  • Each voice coil 3, 4 is a section of a total of two drive units 5, 6, which are fastened in the middle region of a support part 7 in the form of a disk.
  • the two drive units 5, 6 are identical to one another and constructed in a known manner.
  • Each drive unit 5, 6 has a core 8 made of soft iron, an annular permanent magnet 9 which is arranged concentrically with the core 8, a yoke 10 made of soft iron which is connected to the core 8 and is in contact with a surface of the magnet 9, and an annular pole piece 11 made of soft iron, which is connected to the other surface of the magnet 9 and forms an annular gap with the free end region of the core 8, in which the voice coil 3, 4 can move axially.
  • Each of the two voice coils 3 and 4 is wound and fixed in a known manner, for example by gluing on a dimensionally stable, cylindrical grind Coil carrier 12.
  • a centering ring of conventional design hereinafter referred to as spider 13, ensures the hold and centering of the coil carrier 12 and the voice coils 3 and 4 within the air gap, ensuring that these two parts 3, 4 and 12 are free and can move in the axial direction in the air gap.
  • the 1 is composed of two parallel plates 14 and 15, each in the form of a disc. These are held at a distance from one another via webs 16. As can be seen from Fig. 2, the webs have an elongated shape and run radially between the two plates 14, 15, which they stiffen at the same time.
  • the plates 14, 15 can be made of a plastic or a non-magnetic metal. Other materials are possible.
  • the webs 16 are integrally connected to the plates 14 and 15, however, they can also be glued to one or both plates 14, 15. The two plates 14, 15 are connected by gluing to the free surfaces of the webs 16.
  • Each of the two plates 14, 15 has in its central region and on the outer side a circular recess 17 or 18, into which the magnet arrangement 8 to 11 of the drive unit 5 or 6 is inserted and glued.
  • the two drive units 5, 6 are exactly centered with respect to the respectively associated plate 14 or 15, and they are also located on the same axis with one another.
  • the voice coils 3, 4 are coaxial with each other.
  • each of the two plates 14, 15 has an edge-shaped, circular projection 19 or 20, which is integrally connected to the plate 14, 15, but can also be a separate part. In the latter case, it is glued to the outer surface of the plate 14 or 15 along the outer edge thereof.
  • two Support rings 21, 22 By gluing are two Support rings 21, 22 called beads below, connected on the one hand to the outer edge of each of the two membranes 1 and 2 and on the other hand to the projections 19 and 20 of the plates 14 and 15, respectively. They center the two membranes 1, 2 with respect to the plates 14, 15 and the drive units 5, 6, which are supported by the plates 14, 15.
  • the two beads 21, 22 correspond to the beads of conventional loudspeakers, they allow the respective diaphragm 1 or 2 to move as freely as possible in the axial direction (F, G).
  • the membranes 1 and 2 should be as light as possible so that they represent the lowest possible inert mass. On the other hand, they must be as stiff as possible so that they do not deform during their movement, i.e. they cannot be excited to vibrate naturally.
  • the membranes 1 and 2 are made in a known manner from cardboard by the conventional methods or from a cotton-silk fabric which is impregnated with a lacquer, for example nitrocellulose lacquer. In practical trials, it was found that the membranes 1, 2 produced in this way have excellent rigidity despite relatively large dimensions (the diameter of the two membranes was 20 cm in each case). This excellent rigidity is also due to its spherical shell shape.
  • Each of the two membranes 1, 2 is connected to an associated coil support 12 via a rigid transmission part 23 or 24.
  • Each of these two transmission parts 23, 24 runs into them at a right angle and in an area which is sufficiently distant from the apex of the associated membrane 1, 2.
  • the membrane 1 or 2 moves in one piece and dimensionally stable, without being under the action of the driving forces that affect it support part 23 and 24 and by the axial encounters in the direction F, G of the voice coil 3 and 4 are deformed.
  • the transmission parts 23 and 24 are connected in areas to the associated membrane 1 and 2, which lie on a cone jacket with a cone angle alpha of 6o to 9o degrees.
  • the transmission parts 23 and 24 must be as light as possible in order to represent the lowest possible inert mass. On the other hand, they should be as stiff as possible in order not to deform and to be able to transmit the movements of the voice coils 3 and 4 to the two membranes 1 and 2 without loss.
  • the transmission parts 23, 24 are made of a rigid plastic, and they can also be made of cardboard.
  • the transmission parts 23, 24 in a preferred embodiment have a spherical shell shape, which gives them a high degree of rigidity.
  • each of the two transmission parts 23, 24 is firmly connected in its apex region to the free edges of the respectively associated coil carrier 12 and with its circular edge to the respectively associated membrane 1, 2. This connection of the transmission parts with the coil carrier and the membranes 1 and 2 takes place in the preferred embodiment by gluing.
  • the diameter of the spherical shell-shaped transmission parts 23, 24 is lo cm in the exemplary embodiment.
  • the two membranes 1 and 2 behave like a pulsating or breathing ball when the voice coils 3 and 4 are excited by an electrical signal to be converted into sound waves.
  • the two voice coils 3 and 4 are electrically connected so that the two diaphragms 1 and 2 are symmetrical in two opposite directions swing to the center plane of the support member 7 in the form of a disc.
  • the directions of movement are indicated by the arrows F and G in Fig. 1 for the case that both membranes 1 and 2 move away from the support member 7.
  • Measures are provided to balance the internal pressure in the ball formed by the two membranes 1 and 2 with the external pressure.
  • circular openings 25 and 26 are provided in one and the other plates 14 and 15 and in areas located between the webs 16 in the exemplary embodiment. This creates a connection between the air volume located between the membrane 1 and the plate 14 and between the membrane 2 and the plate 15 with the space between the two plates 14 and 15. This space is in turn in connection with the outside atmosphere, that is to say the environment around the ball formed from the two membranes 1 and 2, as a result of which the desired pressure equalization is achieved.
  • a sealing ring 27 is provided for the atmospheric pressure compensation between the two plates 14 and 15 in the edge region of these two plates 14 and 15.
  • it can be made of an elastic foam material or an air-permeable plastic.
  • a labyrinth seal has also proven to be very advantageous.
  • plugs 28 made of an elastic foam material or of an air-permeable plastic are arranged in the openings 25 and 26 of the plates 14 and 15, respectively. Around To avoid reflections from the outwardly facing side surfaces of the two plates 14 and 15, these surfaces are covered with a suitable absorbent material (not shown).
  • FIG. 1 and 2 has at least one of the two plates 14 and 15, or advantageously have both plates 14 and 15.
  • Mounting flanges 29 and 3 0, which, as Fig. 1 shows, disposed opposite to and with a hole for the Attachment of the speaker are provided on a (not shown) bracket. It is also possible to hang it on a suitable supporting part.
  • FIG. 3 shows a second exemplary embodiment of the loudspeaker.
  • the same reference numerals have been used for the same parts.
  • the difference between this second exemplary embodiment according to FIG. 3 and the first exemplary embodiment is that the two drive units 5 and 6 are connected to form a coherent double drive unit 5, 6.
  • the two cores 8 hang together in one piece with a plate 31 which serves as a yoke.
  • the cores 8 and the yoke 31 are made of soft iron.
  • Two ring-shaped magnets 9 of suitable polarity are fastened on both sides of the yoke 31.
  • the support part 7 is formed by a single, disk-like plate 32 and has a central opening 33.
  • This plate 32 has a recess 17 which is concentric with the central opening 33 and into which an annular collar 34 can be inserted, which is an integral part of the yoke 31.
  • the dipple drive unit 5, 6 is inserted into the central opening 33 Collar 34 engages in recess 17 and is glued into it.
  • the double drive unit 5, 6 is aligned symmetrically to the central plane of the plate 32.
  • Two edge-side projections 19 and 2o are integrally connected to the plate 32, they can also be designed as a separate part and glued to the plate 32.
  • Openings 25 are provided in the plate 32 for the pressure equalization described above between the two sides of the support part 7, these openings 15 are in turn covered by plugs 28 made of an elastic foam material or of an air-permeable plastic.
  • Through holes are provided in the two projections 19, 2o, for example in the region of the fastening flange 29, for the atmospheric pressure equalization between the air volume inside the ball formed by the two membranes 1 and 2 and the outside world. It is advantageous to provide radial ribs or webs similar to the webs 16 according to FIG. 2 on at least one side surface of the plate 32 and between the openings 25, as a result of which the plate 32 is stiffened. It is also very advantageous to cover both side surfaces of the plate 32 with a sound-absorbing material.
  • the two voice coils 3 and 4 move in opposite directions when an electrical signal to be converted into sound waves flows through them. Their movements are passed on to the two membranes 1 and 2 via the transmission parts 23, 24, as a result of which they move back and forth and the electrical signal is thus converted into sound pressure fluctuations.
  • the two membranes 1 and 2 vibrate in opposite directions, ie in opposite phase along the axial direction G, F of the two voice coils 3 and 4, it can be seen that the radiation intensity of the invention according speaker in the direction of arrow F and arrow G (Fig. l) is substantially the same as in a direction at right angles to this. In other words, the loudspeaker according to the invention radiates uniformly (isotropically) in practically all directions.
  • the volume enclosed between these parts 1, 23 and 2, 24 can be of a very light, sound-absorbing type Material to be filled out.
  • the transmission parts 23 and 24 can have the same radius as the membranes 1 and 2 to which they are connected and can be glued to them not only linearly along their circular arc-shaped edge, but on the whole of a spherical partial area around the central area to stiffen the membrane 1 or 2. In the latter case, the transmission of the mechanical forces takes place via the respective coil carrier 12, which is now much longer than described above and also has a much larger diameter, that is to say is in turn part of the transmission part 23, 24. However, larger drive units 5, 6 are required.
  • an essential feature of the invention is that the drive units 5, 6 are located within the balls formed by the membranes 1, 2.
  • the membranes 1, 2. instead of spherical membranes in the form of rotating paraboloids, etc. are also possible.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
EP82710017A 1981-04-01 1982-03-30 Haut-parleur électrodynamique pour fréquences sonores basses et moyennes Expired EP0062600B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82710017T ATE14062T1 (de) 1981-04-01 1982-03-30 Elektrodynamischer lautsprecher fuer tiefe und mittlere tonfrequenzen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8106510A FR2503516B1 (fr) 1981-04-01 1981-04-01 Haut-parleur electrodynamique omnidirectionnel pour les frequences basses et medium du spectre sonore
FR8106510 1981-04-01

Publications (2)

Publication Number Publication Date
EP0062600A1 true EP0062600A1 (fr) 1982-10-13
EP0062600B1 EP0062600B1 (fr) 1985-06-26

Family

ID=9256858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82710017A Expired EP0062600B1 (fr) 1981-04-01 1982-03-30 Haut-parleur électrodynamique pour fréquences sonores basses et moyennes

Country Status (6)

Country Link
US (1) US4472605A (fr)
EP (1) EP0062600B1 (fr)
JP (1) JPS5840997A (fr)
AT (1) ATE14062T1 (fr)
DE (1) DE3264396D1 (fr)
FR (1) FR2503516B1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4635287A (en) * 1983-10-19 1987-01-06 Mutsuo Hirano Audio-frequency electromechanical vibrator
USRE32785E (en) * 1983-10-19 1988-11-15 Sanden Corporation Audio-frequency electromechanical vibrator
GB2222745A (en) * 1988-09-13 1990-03-14 Colin George Purves Suppressed air-resonance loudspeaker enclosure
WO1996012382A1 (fr) * 1992-12-23 1996-04-25 Grodinsky Robert M Haut-parleurs a faible distorsion
EP0782370A3 (fr) * 1995-12-14 2006-05-24 Murata Manufacturing Co., Ltd. Haut-parleur pour rayonner des ondes sonores dans toutes les directions rélativement à une surface support du haut-parleur

Families Citing this family (44)

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DE3405635A1 (de) * 1984-02-17 1985-08-22 Rainer J. 5000 Köln Haas Elektrodynamischer lautsprecher mit rundum-schallabstrahlung
DK156454C (da) * 1985-01-03 1990-01-15 Johan Peter Lyngdorf Hoejttalerenhed med mere end en bas/mellemtone-hoejttaler
US4756382A (en) * 1987-03-02 1988-07-12 Hudson Iii Joseph L Loudspeaker having enhanced response at bass frequencies
WO1989003160A1 (fr) * 1987-10-02 1989-04-06 Lineaum Corporation Dispositif de centrage pour membrane de haut-parleur
US5119431A (en) * 1987-12-28 1992-06-02 Hamby William H Efficiency loudspeaker
US4903308A (en) * 1988-02-10 1990-02-20 Linaeum Corporation Audio transducer with controlled flexibility diaphragm
US5198624A (en) * 1988-02-10 1993-03-30 Linaeum Corporation Audio transducer with controlled flexibility diaphragm
US5323466A (en) * 1990-04-25 1994-06-21 Ford Motor Company Tandem transducer magnet structure
US5319165A (en) * 1990-04-25 1994-06-07 Ford Motor Company Dual bandpass secondary source
US5337364A (en) * 1990-11-28 1994-08-09 Canadian Bionic Research Inc. Communication device for transmitting audio information to a user
US5249237A (en) * 1991-05-31 1993-09-28 Linaeum Corporation Audio transducer improvements
US5230021A (en) * 1991-05-31 1993-07-20 Linaeum Corporation Audio transducer improvements
US5526441A (en) * 1991-11-15 1996-06-11 Codnia; Basilio Full range convex electrodynamic loudspeaker
US5231826A (en) * 1992-07-01 1993-08-03 Ford New Holland, Inc. Wing extension for windrow inverters
US5553147A (en) * 1993-05-11 1996-09-03 One Inc. Stereophonic reproduction method and apparatus
US5701358A (en) * 1994-07-05 1997-12-23 Larsen; John T. Isobaric loudspeaker
US5644109A (en) * 1995-05-30 1997-07-01 Newman; Ottis G. Speaker enclosure
DE19821862A1 (de) * 1998-05-15 1999-11-18 Nokia Deutschland Gmbh Schallwiedergabeanordnung
RU2150181C1 (ru) * 1998-09-10 2000-05-27 Волегов Виктор Евгеньевич Электроакустический преобразователь
RU2140727C1 (ru) * 1998-09-10 1999-10-27 Волегов Виктор Евгеньевич Электроакустический преобразователь волегова в.е.
US6047077A (en) * 1998-09-29 2000-04-04 Larsen; John T. Bipolar speaker
US6816598B1 (en) 1999-09-23 2004-11-09 Tierry R. Budge Multiple driver, resonantly-coupled loudspeaker
US6931140B2 (en) * 2001-09-11 2005-08-16 Sonionkirk A/S Electro-acoustic transducer with two diaphragms
ATE414394T1 (de) * 2002-01-25 2008-11-15 Sonion Horsens As Flexible membran mit integrierter spule
GB2411311A (en) * 2004-02-17 2005-08-24 Jazz Hipster Corp Push pull unit speakers with low distortion
JP4573591B2 (ja) * 2004-07-21 2010-11-04 パイオニア株式会社 スピーカーユニット及びその製造方法、並びにスピーカー装置
US20060196723A1 (en) * 2005-03-03 2006-09-07 White Fred I Balloon speaker asembly
US20080008346A1 (en) * 2006-07-06 2008-01-10 Pt. Hartono Istana Teknologi Dynamic reflection 4pi steradian omni directional tweeter
US8135162B2 (en) * 2007-11-14 2012-03-13 Harman International Industries, Incorporated Multiple magnet loudspeaker
US7787645B2 (en) 2007-11-30 2010-08-31 Clair Brothers Audio Systems Inc. Loudspeaker-transducer array
CN102577435A (zh) * 2009-10-15 2012-07-11 日本先锋公司 扬声器装置
GB2515098B (en) * 2013-06-14 2016-02-03 Jaguar Land Rover Ltd Speaker device
JP6265421B2 (ja) * 2014-03-20 2018-01-24 国立大学法人九州工業大学 重低音スピーカ
CN106851457B (zh) * 2017-03-01 2019-10-29 歌尔科技有限公司 喇叭及耳塞式耳机
JP2019125836A (ja) * 2018-01-12 2019-07-25 パイオニア株式会社 磁気回路
US10631096B1 (en) 2019-03-07 2020-04-21 Apple Inc. Force cancelling transducer
CN110996227B (zh) 2019-11-22 2021-05-28 歌尔科技有限公司 扬声器以及音箱设备
US20210219045A1 (en) * 2020-01-13 2021-07-15 Robert John Schunck Bass Augmentation Speaker System
CN112019969B (zh) * 2020-09-22 2023-02-24 王德生 全向扬声器
US11570547B2 (en) 2021-06-09 2023-01-31 Apple Inc. Vibration and force cancelling transducer assembly
US11564033B2 (en) 2021-06-09 2023-01-24 Apple Inc. Vibration and force cancelling transducer assembly having a passive radiator
EP4161096B1 (fr) * 2021-09-30 2025-05-28 Harman Becker Automotive Systems GmbH Haut-parleur
JP7266331B1 (ja) * 2022-01-28 2023-04-28 ウエタックス株式会社 スピーカ
CN218103384U (zh) * 2022-07-07 2022-12-20 李世煌 一种球形音箱

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Publication number Priority date Publication date Assignee Title
FR1146757A (fr) * 1956-02-03 1957-11-14 Haut-parleur fonctionnant en piston
DE1040604B (de) * 1955-03-04 1958-10-09 Johannes Simon Kugellautsprecher
US3393764A (en) * 1966-12-27 1968-07-23 Curtiss R. Schafer Loudspeaker systems
US3456755A (en) * 1963-07-29 1969-07-22 John Walker Hydraulic loudspeakers

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* Cited by examiner, † Cited by third party
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JPS606157B2 (ja) * 1977-07-25 1985-02-15 ソニー株式会社 スピ−カ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1040604B (de) * 1955-03-04 1958-10-09 Johannes Simon Kugellautsprecher
FR1146757A (fr) * 1956-02-03 1957-11-14 Haut-parleur fonctionnant en piston
US3456755A (en) * 1963-07-29 1969-07-22 John Walker Hydraulic loudspeakers
US3393764A (en) * 1966-12-27 1968-07-23 Curtiss R. Schafer Loudspeaker systems

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4635287A (en) * 1983-10-19 1987-01-06 Mutsuo Hirano Audio-frequency electromechanical vibrator
USRE32785E (en) * 1983-10-19 1988-11-15 Sanden Corporation Audio-frequency electromechanical vibrator
GB2222745A (en) * 1988-09-13 1990-03-14 Colin George Purves Suppressed air-resonance loudspeaker enclosure
GB2222745B (en) * 1988-09-13 1993-05-05 Colin George Purves Suppressed air resonance loudspeaker enclosure
WO1996012382A1 (fr) * 1992-12-23 1996-04-25 Grodinsky Robert M Haut-parleurs a faible distorsion
EP0782370A3 (fr) * 1995-12-14 2006-05-24 Murata Manufacturing Co., Ltd. Haut-parleur pour rayonner des ondes sonores dans toutes les directions rélativement à une surface support du haut-parleur

Also Published As

Publication number Publication date
FR2503516B1 (fr) 1986-02-07
US4472605A (en) 1984-09-18
EP0062600B1 (fr) 1985-06-26
JPS5840997A (ja) 1983-03-10
FR2503516A1 (fr) 1982-10-08
ATE14062T1 (de) 1985-07-15
DE3264396D1 (en) 1985-08-01

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