EP1142445B1 - Haut-parleur a membrane de graves - Google Patents

Haut-parleur a membrane de graves Download PDF

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Publication number
EP1142445B1
EP1142445B1 EP99967891A EP99967891A EP1142445B1 EP 1142445 B1 EP1142445 B1 EP 1142445B1 EP 99967891 A EP99967891 A EP 99967891A EP 99967891 A EP99967891 A EP 99967891A EP 1142445 B1 EP1142445 B1 EP 1142445B1
Authority
EP
European Patent Office
Prior art keywords
diaphragm
type bass
bass loudspeaker
opening
housing
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.)
Expired - Lifetime
Application number
EP99967891A
Other languages
German (de)
English (en)
Other versions
EP1142445A2 (fr
Inventor
Norbert Schäfer
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.)
Zuern Joachim
Original Assignee
Zuern Joachim
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 Zuern Joachim filed Critical Zuern Joachim
Publication of EP1142445A2 publication Critical patent/EP1142445A2/fr
Application granted granted Critical
Publication of EP1142445B1 publication Critical patent/EP1142445B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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; 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
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2819—Enclosures comprising vibrating or resonating arrangements of the bass reflex type for loudspeaker transducers
    • 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
    • H04R7/04—Plane diaphragms

Definitions

  • the invention relates to a low-frequency diaphragm speaker Conversion of electrical to acoustic signals.
  • the invention relates to a low-frequency diaphragm speaker with a converter of electrical in mechanical vibrations connected to a membrane, which converts the mechanical vibrations into sound.
  • the housing In a known, often used in practice Low-frequency membrane speaker with a generator of electromagnetic Vibrations connected to a membrane, which the electromagnetic vibrations in sound converted, the housing is a closed airtight Box, with the help of which the back-emitted wavefront the membrane is prevented from using the Front of the membrane radiated meet. at In these closed housings, the air in the housing brakes the Forward and backward movement of the membrane, thereby increasing the resonance frequency of the speaker system. ever smaller the air volume of a closed housing, the higher the spring action of the enclosed air and thus the resonance frequency.
  • a disadvantage of the well-known low-frequency diaphragm speakers is that a good sound or a good reproduction over a large frequency range and especially in the range very small Frequencies, i.e. in the low frequency range, only with large membranes can be generated, because only with these it is possible to create deep To produce sounds.
  • the large membrane becomes one relatively small housing built in, low tones are not emitted because the air cushion on the back of the Membrane slows the movement of the membrane. For this reason the housing of the low-frequency diaphragm speaker must be very be chosen large volume.
  • Another known low-frequency diaphragm speaker has a loudspeaker base body that is enclosed by a closed Housing is surrounded, which on its back pressure equalization openings contains (DE 19601217 C1, EP-0456416 A2). These openings reduce the air cushion stiffness of the membrane and facilitate membrane work through pressure equalization, so the case is a bit smaller for good playback can be chosen as when fully closed Housings.
  • these low-frequency diaphragm speakers low tones are not emitted because the opening in the Range of low frequencies to the rear sound opposed to low air resistance. For this reason the system works in the lower frequency range as if no housing available, i.e. the rear sound extinguishes the sound on the front of the membrane in the area of this low notes.
  • a precisely defined opening in the housing connected with tunnels or channels or a passive membrane leaves the rear Sound to the outside.
  • the opening acts as a pure pressure compensation opening or in certain frequency ranges as Sound amplifiers.
  • the rear sound extinguishes the front sound in certain frequency ranges not more, but reinforces the same.
  • not only vibratable Objects, but also air-filled cavities Have resonance.
  • Known low-frequency diaphragm speakers are special efficient in its resonance range. In the event of a response they are Vibrations of the amplifier, i.e. the vibrations of the enforcing system and the vibrations of the coil and so that the membrane is in phase with normal stroke. The Amplifiers and the restoring force of the membrane act in the same direction. The area around the resonance frequency is consequently reproduced very loudly.
  • the resonance frequency the well-known low-frequency diaphragm speaker is in Working range of the speaker, and thus between 15 Hz and 200 Hz. A lifelike reproduction of tones in The resonance frequency range is without additional means not possible with it. To the resonance range too control, is known to try this Resonance area with elaborate electronic aids to monitor.
  • Sensors and circuits are used, that recognize and report the position of the membrane, so that with suitable electronic control circuits Volume of the resonance frequency range can be regulated can.
  • Known sensors are capacitive or inductive Displacement sensors or light barriers, in which for example a the wedge attached to the membrane.
  • a low-frequency diaphragm loudspeaker according to the preamble of claim 1 is for example, known from US-A-3767005. Additional low-frequency diaphragm speakers are from US-A-4481662 and GB-A-2206262 known.
  • the object of the invention is to provide the best possible low-frequency diaphragm speaker specify.
  • the low-frequency membrane speaker according to the invention Claim 1 has the advantage that the tones of the bass range especially between 30 Hz and the lower hearing limit of 16 Hz not extinguished, but as pure sinusoidal Sounds can be played. Because the resonance frequency completely outside the working area of the speaker is a volume distortion, as in the state of the Technology in the field of resonance frequency is inevitable locked out. The midrange or treble range located resonance frequency allows the entire Low frequency range corresponding to the electrical supply Signal to be transmitted almost error-free.
  • the basic body which acts as a very small housing, is reduced the air cushion size on the back of the membrane.
  • the resonance frequency of the system is advantageously increased. It is particularly favorable to increase the size of the base body choose that the resonance frequency is still in the transmission range of the system, but above the work area lies.
  • the sound from the rear is also advantageous the membrane directly the small opening in the base body or feed in the housing in relation to The sound-emitting membrane acts as a very small membrane. So the sound pressure with the small stroke becomes the desired one Useful sound emitting membrane on the small, rear Opening transformed into noise, which with a large stroke and high speed of movement emerges from the opening and noticeable as an acoustically not disturbing air flow makes. It was found that the volume of this at the Air leakage approx.
  • the low-frequency membrane speaker according to the invention which is the resonance frequency from the work area removed, monitoring is advantageously of the resonance range is not required. costly electronic monitoring circuits can omitted.
  • the low-frequency diaphragm speaker according to the invention characterized in that it is upstream
  • a linear amplifier across the entire working range Represents impedance without significant deviation.
  • the Reinforcement is real, almost without imaginary part, because the Impedance of the coil only above the working area affects, i.e. the speaker provides for the amplifier approximately represents a purely ohmic load much simpler amplifier technology possible, because a electronically very complex technology to compensate for Voltage and resistance fluctuations can be eliminated.
  • the low-frequency diaphragm speaker becomes an open body used, which is inserted into a small housing.
  • the opening is integrated in the housing.
  • the Operation of this embodiment of the low-frequency diaphragm speaker otherwise corresponds to the above mentioned.
  • the design of the low-frequency diaphragm speaker with housing can simplify Opening to be formed by a cutting gap.
  • the Cutting edge is preferably made of metal, but can also be made of an easy to manufacture plastic molded part or made of other suitable materials and will be manufactured with the housing e.g. by screwing, jamming etc. connected. It is particularly advantageous that through this Training if necessary a fine adjustment after the Assembly of the low-frequency diaphragm speaker is possible.
  • the cutting edge allows the depth of the opening desirable to keep small.
  • the opening in a thin-walled sheet for example, for example, hole or slot.
  • a further embodiment of the low-frequency diaphragm loudspeaker is also provided before, this opening as conical or opening gradually decreasing from the inside to the outside to be provided in the housing or base body, which on the Inside of the case has a large area and to the outside towards an opening with a very small area.
  • the efficiency of the low-frequency diaphragm speaker can also a layer of insulation in front of the rear wall of the speaker can be set.
  • the loudspeaker can be manufactured be manufactured particularly easily if that Housing at the end of the assembly with an elbow is closed off in a cutting leg-ending, that avoids the opening.
  • the layer of insulation can entire rear area in the housing before opening to complete. However, it is also possible to use insulation material in front of the opening and / or on the rear wall of the housing to arrange.
  • the low-frequency diaphragm speaker 1 has a housing-like Base body 2 and one lying on its front side, very much bendable suspended plate membrane 3 with a vibration drive 4 located on its rear side operate.
  • a permanent magnet 6 provided at the back of the base plate 5, opposite this, completely non-contact.
  • a bottom plate 7 At the back of the permanent magnet 6 is attached a bottom plate 7, the circumference of which is greater than the outer circumference of the permanent magnet 6.
  • a ring or rectangular Sheath 8 arranged between the protruding bottom plate 7 and the base plate 5 is as Magnetic flux conductor around the magnet 6 a ring or rectangular Sheath 8 arranged.
  • Connecting parts 9, 16 attached a housing 10 such that its front edges 11 in one plane with the front 12 close off the plate membrane 3 or slightly above protrude.
  • this space 18 is in suitably, e.g. by gluing, using an angle piece 20 one of its two legs 21 on the rear wall 13 attached.
  • the second leg 22 of the angle piece 20 closes the housing 10 except for a small gap 23, which forms an opening, with the leg 22 on it Inside towards the opening 23 in a long, flat Sloping 24 runs out.
  • Fig. 2 is a low-frequency diaphragm speaker 1.2 shown, the eight speakers according to FIG. 1 in is composed of a block. From its the housing (10.2) represent the basic body is the upper side wall 14 and the side wall 15.2 detect. The side wall 15.2 is made up of eight side walls 15 1 assembled. In the side wall 15.2 are according to the number of individual speakers 1.1 eight slots 23 are present.
  • the low-frequency diaphragm speaker 1.2 has a height 27 of 1692 mm (millimeters), one Width 28 of 222 mm and a depth 29 of preferably between 30 and 100 mm, in this case 70 mm.
  • the membrane area is 97% (percent) of Front of the woofer diaphragm speaker 1.2.
  • This Front of the speaker covering the baffle of the Loudspeaker consists of 100% loudspeaker chassis.
  • Insulating material 26.3 is in this embodiment only before Step-like, tapered, gap-shaped Opening 23.3 arranged. Insulation material 26 respectively 26.3 can also on the inside of the rear wall 13 and on the side wall 14.3 opposite opening 23.3 be arranged.
  • Insulation material 26 respectively 26.3 can also on the inside of the rear wall 13 and on the side wall 14.3 opposite opening 23.3 be arranged.
  • U-shaped connecting parts 9, 16 according to FIG. 1 have been replaced through appropriately profiled side walls 15.3, 14.3.
  • the opening 23.3 has a length 30 of a little less than 210 mm.
  • the system dimension 31 of the individual is 210 mm Speaker 1.1 in a block of eight speakers composite speakers 1.2. Touch this way the individual slot-shaped openings 23.3 do not each other.
  • the inner width 32 of the step stepped opening 23.3 is present Example case 18 mm.
  • the front width, visible from the outside 34 of this opening 23.3 is between 5 and 15 mm, in present example 8 mm.
  • the front step thickness 36 is 2 mm.
  • the side wall 15.3 has an overall thickness 38 of 5 mm. Such a thin one from here Example of aluminum existing side wall is in the Low-frequency diaphragm speakers 1.1, 1.2, 1.3 possible because the Eigen-resonance frequencies above the working frequencies of the Bass speaker.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Multimedia (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Claims (14)

  1. Haut-parleur à membrane de graves (1), comprenant
    un boítier (10), dont les parois de boítier (13, 14, 15) entourent un volume (25) qui est réalisé sur la face arrière de la membrane (3), et
    au moins un orifice (23) dans une surface, qui délimite le volume, des parois de boítier (13, 14, 15),
       caractérisé en ce que
    le volume (25) est si réduit que la fréquence de résonance du haut-parleur à membrane de graves, à laquelle l'amplificateur et la force de rappel de la membrane (3) agissent dans la même direction, se situe au-dessus de 200 Hz, en particulier au-dessus de 1000 Hz et se trouve donc dans la gamme de fréquences d'un haut-parleur de médiums ou d'aiguës, et
    l'orifice (23) est réalisé pour être très petit, de sorte qu'à chaque fréquence du haut-parleur à membrane de graves, de l'air sort du volume avec une grande vitesse d'air qui n'est pas gênante sur le plan acoustique.
  2. Haut-parleur à membrane de graves (1) selon la revendication 1, caractérisé en ce que le boítier du haut-parleur à membrane de graves (1) est réalisé par le corps de base (2) du haut-parleur à membrane de graves (1).
  3. Haut-parleur à membrane de graves (1) selon la revendication 1, caractérisé en ce que le boítier (10) qui entoure le volume (25) contient le corps de base (2) du haut-parleur à membrane de graves (1).
  4. Haut-parleur à membrane de graves (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'orifice (23) est une fente.
  5. Haut-parleur à membrane de graves (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'orifice (23) est formé par une rainure ou un jeu de coupe qui se réduit vers l'extérieur de façon graduée ou conique.
  6. Haut-parleur à membrane de graves (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'orifice (23) se trouve dans une pièce de boítier très mince.
  7. Haut-parleur à membrane de graves (1) selon la revendication 6, caractérisé en ce que la pièce de boítier mince est une tôle d'aluminium.
  8. Haut-parleur à membrane de graves (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'orifice (23) se compose d'un alésage s'étendant de façon conique qui présente un grand rayon sur la face intérieure de la pièce de boítier et débouche vers l'extérieur sur un passage d'un rayon très petit.
  9. Haut-parleur à membrane de graves (1) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins la pièce de boítier (20), qui dégage l'orifice (23) est fabriquée en métal.
  10. Haut-parleur à membrane de graves selon l'une quelconque des revendications précédentes, caractérisé en ce que plusieurs, en particulier huit, haut-parleurs à membrane de graves (1.1) sont assemblés en un bloc.
  11. Haut-parleur à membrane de graves (1.2) selon la revendication 10, caractérisé en ce que le bloc possède un seul boítier (10.2).
  12. Haut-parleur à membrane de graves selon la revendication 10 ou 11, caractérisé en ce que le bloc a une profondeur (30) de 30 à 100 mm, en particulier de 70 mm.
  13. Haut-parleur à membrane de graves (1.2) selon l'une quelconque des revendications 10 ou 12, caractérisé en ce que le bloc composé de huit haut-parleurs à membrane de graves (1.1) a une hauteur (27) d'environ 1692 mm, une largeur (28) d'environ 222 mm et une profondeur (29) d'environ 70 mm.
  14. Haut-parleur à membrane de graves (1 ; 1.2) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un isolant (26 ; 26.3) est présent dans le volume (25 ; 25.3), et dans celui-ci au moins devant l'orifice (23 ; 23.3).
EP99967891A 1998-12-21 1999-12-21 Haut-parleur a membrane de graves Expired - Lifetime EP1142445B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19859046 1998-12-21
DE19859046A DE19859046A1 (de) 1998-12-21 1998-12-21 Tiefton-Membranlautsprecher
PCT/DE1999/004073 WO2000038474A2 (fr) 1998-12-21 1999-12-21 Haut-parleur a membrane de graves

Publications (2)

Publication Number Publication Date
EP1142445A2 EP1142445A2 (fr) 2001-10-10
EP1142445B1 true EP1142445B1 (fr) 2002-10-23

Family

ID=7891979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99967891A Expired - Lifetime EP1142445B1 (fr) 1998-12-21 1999-12-21 Haut-parleur a membrane de graves

Country Status (10)

Country Link
US (1) US20020012439A1 (fr)
EP (1) EP1142445B1 (fr)
JP (1) JP2003508937A (fr)
AT (1) ATE226781T1 (fr)
AU (1) AU2428700A (fr)
DE (3) DE19859046A1 (fr)
DK (1) DK1142445T3 (fr)
ES (1) ES2186434T3 (fr)
PT (1) PT1142445E (fr)
WO (1) WO2000038474A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7702114B2 (en) * 2003-09-16 2010-04-20 Koninklijke Philips Electronics N.V. High efficiency audio transducer
US7801320B2 (en) * 2006-03-09 2010-09-21 Nokia Corporation Sound sponge for loudspeakers
JP4811367B2 (ja) * 2007-07-24 2011-11-09 ソニー株式会社 振動材、音声出力装置
JP5188839B2 (ja) * 2008-02-28 2013-04-24 株式会社ジャムコ フラットパネルスピーカー
US9301043B2 (en) * 2013-05-01 2016-03-29 Harman International Industries, Inc. Sealed speaker system having a pressure vent

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AR192576A1 (es) * 1971-06-16 1973-02-28 Bertagni J Un diafragma para altoparlantes planos para acentuar las bajas frecuencias y cambiar el timbre y el color de sonido
US4481662A (en) * 1982-01-07 1984-11-06 Long Edward M Method and apparatus for operating a loudspeaker below resonant frequency
US4872527A (en) * 1987-05-30 1989-10-10 Samsung Electronics Co., Ltd. Speaker system
US4792978A (en) * 1987-08-28 1988-12-20 Marquiss Stanley L Planar loudspeaker system
JP2653219B2 (ja) * 1990-05-11 1997-09-17 松下電器産業株式会社 スピーカシステム
DE19601217C1 (de) * 1996-01-15 1997-07-24 Mark Iv Audio Deutschland Gmbh Baßreflexbox

Also Published As

Publication number Publication date
ES2186434T3 (es) 2003-05-01
AU2428700A (en) 2000-07-12
ATE226781T1 (de) 2002-11-15
WO2000038474A2 (fr) 2000-06-29
DE19859046A1 (de) 2000-07-20
PT1142445E (pt) 2003-03-31
JP2003508937A (ja) 2003-03-04
WO2000038474A3 (fr) 2000-11-23
DE19982826D2 (de) 2002-01-03
US20020012439A1 (en) 2002-01-31
DK1142445T3 (da) 2003-02-24
DE59903210D1 (de) 2002-11-28
EP1142445A2 (fr) 2001-10-10

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