EP0284051A1 - Luftdicht geschlossenes Lautsprechergehäuse - Google Patents

Luftdicht geschlossenes Lautsprechergehäuse Download PDF

Info

Publication number
EP0284051A1
EP0284051A1 EP88104667A EP88104667A EP0284051A1 EP 0284051 A1 EP0284051 A1 EP 0284051A1 EP 88104667 A EP88104667 A EP 88104667A EP 88104667 A EP88104667 A EP 88104667A EP 0284051 A1 EP0284051 A1 EP 0284051A1
Authority
EP
European Patent Office
Prior art keywords
housing
membrane
passive
passive membrane
air volume
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.)
Withdrawn
Application number
EP88104667A
Other languages
German (de)
English (en)
French (fr)
Inventor
Friedemann Dr.-Ing. Meggl
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
Original Assignee
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
Publication of EP0284051A1 publication Critical patent/EP0284051A1/de
Withdrawn legal-status Critical Current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
    • 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 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; 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 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/283—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm
    • H04R1/2834—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm for loudspeaker transducers

Definitions

  • the invention is a closed loudspeaker housing in which, in addition to active electromechanical transducers, one or more passive membranes for amplifying the sound radiation are installed, which are set in motion by the pressure fluctuations inside the housing and are driven as freely and with as little damping as possible.
  • Conventional passive diaphragms are built like electrodynamic loudspeakers, but without a voice coil / magnet drive system.
  • Conventional individual parts of electrodynamic loudspeakers such as membranes, beading centering spiders and loudspeaker cages are used for their manufacture.
  • Their membranes are made of stiff, but as light as possible material and vibrate like a piston without deforming.
  • the bass-enhancing effect is limited to a relatively small frequency range and is achieved through an additional resonance. This leads to a louder but not always clean bass reproduction.
  • the development goal for loudspeakers is deep bass reproduction with good efficiency in small housing dimensions.
  • the cutoff frequency, efficiency and volume are linked.
  • the aim is to achieve a damping factor of 0.7 for the mass / spring system of the active diaphragm, which is perceived as optimal in terms of sound.
  • Horn systems require sound channel dimensions that correspond to the 4th part of the wavelength of the lowest emitted frequency. They cannot be reduced in size and audibly produce typical discolouration and a strong directivity.
  • the invention has for its object to provide speaker cabinets that allow deep, clean bass reproduction with small dimensions.
  • one or more passive air-impermeable membranes for sound radiation are installed in the loudspeaker housing, which are excited to vibrate in the housing as a result of the pressure fluctuations generated by the active membrane of the transducer, and are designed so that they are connected to the spring force of the enclosed air volume and its own internal spring force, which counteracts deformation, can form as many resonances as possible in the largest possible frequency range.
  • the passive membrane must also be designed so that it is impermeable to air.
  • the broadband radiation of the passive membrane also significantly improves the acoustic adaptation of the active membrane to the radiation field, which leads to a clean and impulse-true sound image.
  • the entire rear wall of the loudspeaker housing 1 consists of a flat, elastic membrane 2, e.g. made of rubber or silicone. It is caused by pressure fluctuations in the housing 1, generated by the active membrane of the transducer 4, vibrated, which should be as low-damping and uninhibited len.
  • the thickness of the membrane and its material properties essentially determined the lowest resonance frequency. The thickness is typically a few millimeters.
  • the geometric shape of the clamping profile of the passive membrane 2 has an influence on the frequency position of the individual vibration modes. It can be designed to adjust the frequency response and bandwidth.
  • FIG. 2 shows a further embodiment of the passive membrane 2, which is composed of elements of different mass and elasticity due to its composition. In this way, the desired characteristic of the vibration modes can be set very easily.
  • the membrane is made up of heavy and rigid mass elements 5 and elastic connecting elements 6.
  • the application of the measure according to the invention is particularly suitable for housing shapes which do not allow standing waves to arise in the interior, such as cylindrical shape, spherical shape, hemispherical shape, etc.
  • Figure 3 shows a particularly inexpensive construction of a cabinet speaker using the cylinder shape 9.
  • the transducer is installed asymmetrically on the front side.
  • the rear radial cut surface is covered by the passive membrane 2.
  • Figure 4 shows the invention in a pyramid-shaped housing.
  • the passive membrane 2 either replaces one or more rear walls or the floor area.
  • the passive membrane 2 can therefore be attached to all sides of a loudspeaker housing. Several membranes can also be provided. It is also possible to attach a passive membrane to the remaining surface of the front. A symmetrical arrangement in such a way that two diaphragms swing in push-pull compensates for the forces introduced by the diaphragms into the housing.
  • All such inner housings must have at least one elastic wall 2 in order to vary their volume as a function of pressure.
  • the area of the passive membrane (s) is chosen to be larger than the area of the active membrane of the transducer.
  • the passive membrane is also heavier than the active membrane of the converter.
  • All boundary surfaces of the loudspeaker housing can be equipped with a passive membrane.
  • the passive membrane is preferably flat, but can also have a non-planar shape adapted to the shape of the housing.
  • the shape of the passive membrane can be stretched over fixed mechanical support points or support lines.
  • the formation of the resonance distribution can be favored in that the passive membrane consists of a combination of elastic and less elastic, or solid elements, the focal points of which are within the membrane plane.
  • the passive membrane has location-dependent mechanical properties over the surface, the distribution function of the mechanical properties preferably having geometric symmetry properties.
  • the lowest resonance frequency of the passive membrane is approximately one octave below the resonance frequency of the active transducer when the passive membrane is held.
  • additional masses are attached to the membrane on the passive membrane via spring elements.
  • a geometrical outer contour enables as many vibration modes as possible.
  • Earth points are attached to the passive membrane.
  • the passive membrane is designed and arranged so that the vibra tion of the passive membrane can be as undamped and uninhibited as possible.
  • a plurality of passive membranes can be arranged in a loudspeaker housing in such a way that they touch the enclosed and external air volume.
  • passive diaphragms In the case of two identically constructed passive diaphragms, these are arranged in such a way that they move in a push-pull manner and compensate for the forces introduced into the housing as a result of diaphragm movement.
  • the housing can be equipped with a full range converter, but it can also house a multi-way speaker system.
  • Two or more transducers can be acoustically connected in series in such a way that the force of their diaphragms added up to the enclosed and external air volume.
  • transducers can be installed in such a way that their membranes touch the enclosed and external air volume.
  • An advantageous material for the passive membrane is silicone with a low Shore hardness. Additional weights can be incorporated into the passive membrane. Homogeneous thickness and formation of the passive membrane are advantageous. Bass reproduction can be influenced if the passive membrane is pre-stressed.
  • the speaker cabinet can be divided into two or more chambers that have openings smaller than the diaphragm diameter . of the largest converter in terms of area, are interconnected.
  • the passive membrane is opposed by a solid wall in the housing, which is provided with one or more openings, which make acoustic contact with the active transducer.
  • the passive membrane covers a radial cut surface and is the active transducer built into this cut surface or in the opposite housing wall.
  • the transducer can be outside the center of the radial cutting surface
  • the loudspeaker diaphragm is dimensioned such that the restoring force of the passive diaphragm is mainly applied from the spring force of the enclosed air volume.
  • the passive membrane has a thickness of at least one millimeter. That is e.g. trained round.
  • the loudspeaker housing is preferably made of plastic. There is no material in the loudspeaker housing for damping cavity vibrations.

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP88104667A 1987-03-25 1988-03-23 Luftdicht geschlossenes Lautsprechergehäuse Withdrawn EP0284051A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873709700 DE3709700A1 (de) 1987-03-25 1987-03-25 Lautsprechergehaeuse
DE3709700 1987-03-25

Publications (1)

Publication Number Publication Date
EP0284051A1 true EP0284051A1 (de) 1988-09-28

Family

ID=6323887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104667A Withdrawn EP0284051A1 (de) 1987-03-25 1988-03-23 Luftdicht geschlossenes Lautsprechergehäuse

Country Status (4)

Country Link
EP (1) EP0284051A1 (enrdf_load_stackoverflow)
KR (1) KR890700996A (enrdf_load_stackoverflow)
DE (1) DE3709700A1 (enrdf_load_stackoverflow)
WO (1) WO1988007802A1 (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4426995A1 (de) * 1994-07-20 1996-01-25 Helmut Kremer Permanent-Dynamischer Lautsprecher mit zylindrischer Abstrahlung
EP1345469A1 (en) * 2002-03-15 2003-09-17 Matsushita Electric Industrial Co., Ltd. Loudspeaker system
EP0991295A3 (en) * 1998-09-28 2006-07-19 Murata Manufacturing Co., Ltd. Speaker and speaker device
EP1942699A1 (en) * 2007-01-04 2008-07-09 Global Target Enterprise INC. Film-type audio output apparatus
AU2007200405B2 (en) * 2006-12-21 2010-03-25 Global Target Enterprise Inc Film-type audio output apparatus
WO2022053165A1 (de) * 2020-09-14 2022-03-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Mems-bauelement, hearable, mems-pumpe, lautsprecher und verfahren zum ansteuern eines mems-bauelements

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU634773B2 (en) * 1989-05-08 1993-03-04 Basil Arif Spheroidin dna isolate and recombinant entomopoxvirus expression vectors
DE102015205658B4 (de) * 2015-03-27 2017-03-16 Matthias Hommel Lautsprecher
CN209462592U (zh) * 2018-12-17 2019-10-01 歌尔科技有限公司 声学装置和电子设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE706137C (de) * 1934-02-17 1941-05-19 Rca Corp Lautsprecheranordnung
US2713396A (en) * 1950-05-24 1955-07-19 Ernest A Tavares Novel, small, extended low frequency response, loudspeaker enclosure
DE1074651B (de) * 1956-03-08 1960-02-04 Deutsche Post Betnebslaboratorium fur Rundfunk und Fernsehen Ber Im Adlershof Anordnung zur Er zielung der Erweiterung des Frequenz bereiches in Richtung der tieferen Frc quenzen bei akustischen Strahlern
US4168762A (en) * 1978-01-13 1979-09-25 Amanita Sound, Inc. Loudspeaker enclosure
US4284844A (en) * 1979-05-07 1981-08-18 Belles Research Corp. Loudspeaker system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3727719A (en) * 1969-06-19 1973-04-17 S Yando Sound reproducing system
DE2218496C3 (de) * 1972-04-17 1983-12-08 Hans-Joachim 3300 Braunschweig Gieger Gehäuselautsprecher
DE3102870A1 (de) * 1981-01-29 1982-08-19 Hans-Joachim 3300 Braunschweig Gieger Gehaeuselautsprecher

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE706137C (de) * 1934-02-17 1941-05-19 Rca Corp Lautsprecheranordnung
US2713396A (en) * 1950-05-24 1955-07-19 Ernest A Tavares Novel, small, extended low frequency response, loudspeaker enclosure
DE1074651B (de) * 1956-03-08 1960-02-04 Deutsche Post Betnebslaboratorium fur Rundfunk und Fernsehen Ber Im Adlershof Anordnung zur Er zielung der Erweiterung des Frequenz bereiches in Richtung der tieferen Frc quenzen bei akustischen Strahlern
US4168762A (en) * 1978-01-13 1979-09-25 Amanita Sound, Inc. Loudspeaker enclosure
US4284844A (en) * 1979-05-07 1981-08-18 Belles Research Corp. Loudspeaker system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4426995A1 (de) * 1994-07-20 1996-01-25 Helmut Kremer Permanent-Dynamischer Lautsprecher mit zylindrischer Abstrahlung
DE4426995C2 (de) * 1994-07-20 1999-07-29 Helmut Kremer Permanent-Dynamischer Lautsprecher mit zylindrischer Abstrahlung
EP0991295A3 (en) * 1998-09-28 2006-07-19 Murata Manufacturing Co., Ltd. Speaker and speaker device
EP1345469A1 (en) * 2002-03-15 2003-09-17 Matsushita Electric Industrial Co., Ltd. Loudspeaker system
US7212648B2 (en) 2002-03-15 2007-05-01 Matsushita Electric Industrial Co., Ltd. Loudspeaker system in which a diaphragm panel is driven by an electromechanical acoustic converter
CN100377620C (zh) * 2002-03-15 2008-03-26 松下电器产业株式会社 扬声器系统
AU2007200405B2 (en) * 2006-12-21 2010-03-25 Global Target Enterprise Inc Film-type audio output apparatus
EP1942699A1 (en) * 2007-01-04 2008-07-09 Global Target Enterprise INC. Film-type audio output apparatus
WO2022053165A1 (de) * 2020-09-14 2022-03-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Mems-bauelement, hearable, mems-pumpe, lautsprecher und verfahren zum ansteuern eines mems-bauelements
TWI848234B (zh) * 2020-09-14 2024-07-11 弗勞恩霍夫爾協會 Ｍｅｍｓ裝置

Also Published As

Publication number Publication date
DE3709700A1 (de) 1988-10-13
DE3709700C2 (enrdf_load_stackoverflow) 1989-10-05
WO1988007802A1 (en) 1988-10-06
KR890700996A (ko) 1989-04-28

Similar Documents

Publication Publication Date Title
EP2396973B1 (de) Flachlautsprecher
EP1120994B1 (de) Flachlautsprecheranordnung
DE60308659T2 (de) Lautsprecher
DE3531325A1 (de) Piezoelektrische schwingkoerper und mit denselben ausgestatteter lautsprecher
DE2815051A1 (de) Kopfhoerer in geschlossener bauweise
US5374124A (en) Multi-compound isobarik loudspeaker system
DE2536439A1 (de) Lautsprechersystem
GB2477020A (en) Autoaugmented speaker bass reflex port is compliantly mounted to speaker baffle
DE3010313C2 (de) Richtmikrophon
EP0284051A1 (de) Luftdicht geschlossenes Lautsprechergehäuse
DE60132357T2 (de) Lautsprecher
EP1236375A2 (de) Flachlautsprecheranordnung für tieftonwiedergabe
DE3138566A1 (de) Lautsprecher, insbesondere hochtonlautsprecher
EP1410680B1 (de) Plattenlautsprecher
EP0896497B1 (de) Tonwiedergabeanordnung
DE102015104478A1 (de) Flachlautsprecher
DE102012025422B4 (de) Vorrichtung zur Resonanzminimierung von Gehäusen
DE102008013627B4 (de) Lautsprecher
DE102010025058B4 (de) Flaches Panel-Lautsprechersystem
EP1119219A2 (de) Elektrisch-akustischer Miniaturwandler
EP1600034B1 (de) Lautsprecherbox
DE19859046A1 (de) Tiefton-Membranlautsprecher
DE2701080A1 (de) Umlaufend ausgebildetes schallwiedergabesystem mit hornartigem charakter
DE8704406U1 (de) Lautsprechergehäuse
DE4335087A1 (de) Verfahren und Wandler zum Wandeln der mechanischen Schwingung eines Treibers in ein akustisches Signal

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: A1

Designated state(s): ES GR

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19890329