EP1646263A2 - Coaxial loudspeaker with waveform diaphragm - Google Patents
Coaxial loudspeaker with waveform diaphragm Download PDFInfo
- Publication number
- EP1646263A2 EP1646263A2 EP05020885A EP05020885A EP1646263A2 EP 1646263 A2 EP1646263 A2 EP 1646263A2 EP 05020885 A EP05020885 A EP 05020885A EP 05020885 A EP05020885 A EP 05020885A EP 1646263 A2 EP1646263 A2 EP 1646263A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- coaxial loudspeaker
- loudspeaker according
- membrane
- slots
- 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
Links
- 239000012528 membrane Substances 0.000 claims abstract description 31
- 229910052779 Neodymium Inorganic materials 0.000 claims description 13
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical group [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 13
- 238000013016 damping Methods 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910000583 Nd alloy Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
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
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
-
- 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
- H04R9/025—Magnetic circuit
Definitions
- the invention relates to a coaxial loudspeaker with wave-shaped membrane according to the preamble of the main claim.
- a coaxial loudspeaker two loudspeakers of different frequency ranges, e.g. a so-called “midrange” and a “tweeter” combined.
- Tweeters with a meandering folded membrane according to the air-motion principle are known for example from the utility model DE-U1 73 22 245. There, however, a connecting member for a direct coupling via an attached to a centering rod is required, which is expensive and increases the overall length.
- the slots are open in the front panel in the field of sound radiation and are arranged at right angles to the direction of the folds of the membrane film, a tonal very balanced reproduction is achieved because the overall linearity is significantly improved.
- the entire unit is installed due to a square mounting plate in a rotated by 90 ° about the longitudinal axis position to be optimally used both in horizontal and vertical speakers can, in particular, to be able to use the substantially horizontal defined broad-angle radiation characteristic with horizontally extending slots ,
- neodymium plate instead of, for example, neodymium rods, a significant improvement in the pulse fidelity can be achieved by increasing the bandwidth to now 50 kHz.
- the sensitivity is increased in a preferred embodiment to over 90 dB / W / m in efficiency.
- Bundlingungshackes still another sound conduction can be provided via a high or a midrange.
- the slots have approximately a 5mm wide and 25mm long length parallel to each other in the central region of the front panel.
- a damping plate is also provided, which exceeds the membrane membrane in dimension and this protects against direct contact with the neodymium plate, which extends the life, but also for larger deflections causes the sound fidelity.
- the neodymium plate is finally held in a Magnethaltering spaced from a lower pole plate, wherein a sleeve which forms the wall of the closed chamber encloses the individual parts to the front panel.
- the membrane sheet is held by a film retaining ring.
- a front plate 16 with screw holes and five slots 26 is shown, below which a film retaining ring is present, which has in its interior a recess corresponding to the dimensions of the underlying rectangular wavy meandering membrane film 12.
- a sound guide plate 32 and the diaphragm unit for the midrange 30 can be arranged in front of the front panel.
- Reference numeral 36 shows a basket unit for the coaxial structure of the speaker. Within this is the voice coil of the midrange system 34, which is glued to the diaphragm 30 of the midrange. It is important that the centers of the sound-producing, used as a tweeter wavy membrane sheet 12 and another membrane unit 30 in front of the back chamber of the used as a midrange oscillating system horizontally and vertically on a plane.
- the magnetic system belonging to the middle system consists of the parts 38a-d arranged in front of the wave-shaped corrugated sheet metal folded or corrugated membrane sheet 12.
- the designated by reference numeral 38 a ring is preferably made of a neodymium alloy (NdFeB) or at least soft iron.
- the associated front plate 26 is located in front of the membrane film 12.
- a damping plate which exceeds the dimensions of both the associated neodymium plate 40 and the membrane foil 12, and is designated by reference numeral 14.
- Numeral 10 is an iron pole core (see also Fig. 2), and 20 is a sleeve surrounding the magnet system as a whole.
- a magnet retaining ring 22 provided with a recess for the neodymium pole and a bearing edge for the damping plate 14, and a bottom pole plate 24 is finally shown together with solder lugs 46 in the lower part of the drawing.
- Reference numeral 42 denotes a cover cap for the mid-tone unit into which, in particular, the fourth part of the magnet system, an iron ring 38d, fits.
- Reference numeral 44 denotes a sealing ring.
- the entire system forms a ready-to-install, separately sealed mounting unit to cover the frequency range from 400 Hz to 50 kHz.
- Fig. 2 are in a representation of only the magnetic structure (without coils, etc.), the two magnetic gaps, namely the midrange, located in the drawing with horizontally extending field lines gap 28 between pole core 38b and pole plate 38c, and the tweeter gap 18 (with vertical field lines in the drawing between the neodymium magnetic plate 40 and front panel 16).
- the plane offset is chosen to be very small at 7 mm, so that successful in conjunction with the preferably in the width-length ratio of 1: 5 parallel to each other provided five slots in a too large offset resulting phasing is avoided. Due to the closed design of the invention Koaxiallaut Anlageners is a Provision a separate mid-tone chamber in a loudspeaker receiving speaker loudspeaker superfluous.
- the coaxial loudspeaker according to the invention in addition to the wavy membrane sheet 12 in front of a closed, rear chamber for at least one high-energy permanent magnet a plate-shaped, axially magnetized magnetic element 10 and a front plate, are arranged in the slots in front of the membrane sheet 12, that the generated sound exit well At the same time, the membrane film is well mechanically protected in the tightest of spaces.
- the rectangular membrane film allows the greatest possible passage of sound while avoiding a symmetry effect that could affect the sound passage.
- the individual slots should therefore also end rounded.
- a right-angle neodymium plate 10 should be selected and between neodymium plate 10 and membrane sheet 12, a damping plate 14 are provided, one of the wall of the closed chamber forming sleeve 20 enclosed magnetic retaining ring 22 for spaced from a lower pole plate 24 storage of the magnetic element 10 is used.
- the magnetically "soft" elements 38d, 38c are then both components of a flat panel midrange assembly and an air-motion tweeter assembly.
Landscapes
- 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)
- Diaphragms For Electromechanical Transducers (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
Description
Die Erfindung betrifft einen Koaxiallautsprecher mit wellenförmiger Membran nach dem Oberbegriff des Hauptanspruches. In einem Koaxiallautsprecher werden zwei Lautsprecher verschiedener Frequenzbereiche, z.B. ein sog. "Mitteltöner" und ein "Hochtöner" zusammengefaßt.The invention relates to a coaxial loudspeaker with wave-shaped membrane according to the preamble of the main claim. In a coaxial loudspeaker, two loudspeakers of different frequency ranges, e.g. a so-called "midrange" and a "tweeter" combined.
Hochtonlautsprecher mit mäanderförmig gefalteter Membran nach dem air-motion Prinzip sind dabei beispielsweise aus dem Gebrauchsmuster DE-U1 73 22 245 bekannt. Dort jedoch ist ein Verbindungsglied für eine direkte Ankupplung über eine an einer Zentriermembran ansetzende Stange erforderlich, was aufwendig ist und die Baulänge vergrößert.Tweeters with a meandering folded membrane according to the air-motion principle are known for example from the utility model DE-U1 73 22 245. There, however, a connecting member for a direct coupling via an attached to a centering rod is required, which is expensive and increases the overall length.
Vorliegend soll jedoch ein kompakter Aufbau in einem Koaxiallautsprecher erreicht werden. Weiter sollen die akustischen Eigenschaften insbesondere hinsichtlich Frequenzgang und Wirkungsgrad verbessert werden.In the present case, however, a compact design in a coaxial speaker is to be achieved. Next, the acoustic properties are to be improved in particular in terms of frequency response and efficiency.
Erfindungsgemäß wird dies durch einen Koaxiallautsprecher mit den Merkmalen des Hauptanspruchs gelöst. Die Unteransprüche geben vorteilhafte Ausführungen wieder. Es wird insbesondere vorgeschlagen, eine axial magnetisierte Magnetplatte zu verwenden, über der eine wellenförmige Membran angeordnet ist, wobei eine geschlossene rückseitige Kammer gebildet wird und eine frontseitige Platte vor der Membranfolie vorgesehen wird.This is achieved by a coaxial loudspeaker with the features of the main claim. The dependent claims give advantageous embodiments again. In particular, it is proposed to use an axially magnetized magnetic plate over which a wave-shaped membrane is disposed, forming a closed back chamber and providing a front plate in front of the membrane sheet.
Durch diese konstruktiven Verbesserungen wird eine deutliche Erweiterung des Übertragungsbereiches mit einer Wirkungsgraderhöhung von 3dB bis hinauf zu 50 kHz erreicht. Bisherige Konstruktionen mit rückseitig geschlossener Kammer waren dagegen stets auf einen Übertragungsbereich von bis zu 28 kHz eingeschränkt. Dies ist für Hifi-Anforderungen nicht befriedigend.Through these design improvements, a significant extension of the transmission range is achieved with an increase in efficiency of 3dB up to 50 kHz. On the other hand, previous designs with chamber closed on the back were always restricted to a transmission range of up to 28 kHz. This is not satisfactory for hi-fi requirements.
Dadurch, dass die Schlitze in der Frontplatte im Bereich der Schallabstrahlung geöffnet sind und rechtwinklig zur Richtung der Falten der Membranfolie angeordnet sind, wird eine tonal sehr ausgewogene Wiedergabe erreicht, weil die Gesamtlinearität deutlich verbessert ist. Die gesamte Einheit ist aufgrund einer quadratischen Montageplatte auch in einer um 90° um die Längsachse gedrehten Position einbaubar, um sowohl in liegenden wie stehenden Lautsprechern optimal eingesetzt werden zu können, insbesondere, die im wesentlichen horizontale definiert breitwinklige Abstrahlcharakteristik bei horizontal verlaufenden Schlitzen nutzen zu können.The fact that the slots are open in the front panel in the field of sound radiation and are arranged at right angles to the direction of the folds of the membrane film, a tonal very balanced reproduction is achieved because the overall linearity is significantly improved. The entire unit is installed due to a square mounting plate in a rotated by 90 ° about the longitudinal axis position to be optimally used both in horizontal and vertical speakers can, in particular, to be able to use the substantially horizontal defined broad-angle radiation characteristic with horizontally extending slots ,
Durch die Verwendung einer Neodymplatte anstelle beispielsweise von Neodymstäben lässt sich eine deutliche Verbesserung der Impulstreue durch die Erhöhung der Bandbreite auf nunmehr 50 kHz erreichen. Die Kennempfindlichkeit wird in einer bevorzugten Ausführungsform auf über 90 dB/W/m im Wirkungsgrad erhöht. Zur Erhöhung des Bündelungsmaßes kann noch eine weitere Schallführung über einen Hoch- oder auch einen Mitteltöner vorgesehen werden.By using a neodymium plate instead of, for example, neodymium rods, a significant improvement in the pulse fidelity can be achieved by increasing the bandwidth to now 50 kHz. The sensitivity is increased in a preferred embodiment to over 90 dB / W / m in efficiency. To increase the Bundlingungsmaßes still another sound conduction can be provided via a high or a midrange.
Vorteilhaft ist hierbei dann, daß die Schlitze ca. eine 5mm große Breite und 25mm große Länge parallel zueinander im mittleren Bereich der Frontplatte aufweisen.It is advantageous in this case that the slots have approximately a 5mm wide and 25mm long length parallel to each other in the central region of the front panel.
Zwischen Neodymplatte und Membranfolie wird zusätzlich eine Dämpfungsplatte vorgesehen, die in den Abmessung die Membranfolie übersteigt und diese vor direktem Kontakt mit der Neodymplatte schützt, was die Lebensdauer verlängert, aber auch bei größeren Auslenkungen die Schalltreue bewirkt.Between neodymium plate and membrane film, a damping plate is also provided, which exceeds the membrane membrane in dimension and this protects against direct contact with the neodymium plate, which extends the life, but also for larger deflections causes the sound fidelity.
Die Neodymplatte wird schließlich in einem Magnethaltering beanstandet von einer unteren Polplatte gehalten, wobei eine Hülse, die die Wandung der geschlossenen Kammer bildet, die einzelnen Teile bis auf die Frontplatte umschließt. In ähnlicher Weise wird die Membranfolie durch einen Folienhaltering gehalten.The neodymium plate is finally held in a Magnethaltering spaced from a lower pole plate, wherein a sleeve which forms the wall of the closed chamber encloses the individual parts to the front panel. Similarly, the membrane sheet is held by a film retaining ring.
Weitere Vorteile und Merkmale der Erfindung ergeben sich aus nachfolgender Beschreibung eines bevorzugten Ausführungsbeispiels anhand der beigefügten Zeichnung. Dabei zeigt :
- Fig.1
- in Explosionsdarstellung die einzelnen Elemente des Hochtonlautsprechers,
- Fig. 2
- eine Schnittansicht des Magnetsystems, und
- Fig. 3
- die Frontansicht, geprägt durch die Schlitze in der Frontplatte.
- Fig.1
- exploded view of the individual elements of the tweeter,
- Fig. 2
- a sectional view of the magnet system, and
- Fig. 3
- the front view, marked by the slots in the front panel.
Von oben beginnend ist eine Frontplatte 16 mit Schraubbohrungen und fünf Schlitzen 26 dargestellt, unterhalb derer ein Folienhaltering vorhanden ist, der in seinem Inneren eine Aussparung entsprechend den Dimensionen der darunterliegenden rechtwinkligen, wellenförmig mäandernd ausgebildeten Membranfolie 12 besitzt.Starting from the top, a
Vor der Frontplatte kann in einer bevorzugten Ausführungsform eine Schallführungsplatte 32 und die Membraneinheit für den Mitteltöner 30 angeordnet werden. Bezugszeichen 36 zeigt eine Korbeinheit für den koaxialen Aufbau des Lautsprechers. Innerhalb dieser befindet sich die Schwingspule des Mitteltonsystems 34, die mit der Membran 30 des Mitteltöners verklebt ist. Wichtig ist dabei, daß die Mittelpunkte der schallerzeugenden, als Hochtöner genutzten wellenförmigen Membranfolie 12 und eine weitere Membraneinheit 30 vor der rückseitigen Kammer des als Mitteltöner genutzten Schwingsystems horizontal und vertikal auf einer Ebene liegen.In front of the front panel, in a preferred embodiment, a
Das zum Mitteltonsytem gehörige Magnetsystem besteht dabei aus den vor der wellenförmig nach Art eines Wellblechs gefalteten oder gewellten Membranfolie 12 angeordneten Teilen 38a-d. Der mit Bezugszeichen 38 a bezeichnete Ring wird bevorzugt aus einer Neodym-Legierung (NdFeB) oder wenigstens Weicheisen gefertigt.The magnetic system belonging to the middle system consists of the parts 38a-d arranged in front of the wave-shaped corrugated sheet metal folded or
Dagegen ist das zum Hochtöner gehörige Magnetsystem aus den Teilen 24, 10; 40 hinter der gewellten Membranfolie 12 angeordnet. Die zugehörige Frontplatte 26 befindet sich vor der Membranfolie 12.In contrast, the tweeter belonging to the magnetic system of the
Dazwischen ist weiter eine Dämpfungsplatte, die die Ausmessungen sowohl der zugehörigen Neodymplatte 40, wie der Membranfolie 12 übersteigt, vorgesehen und mit Bezugszeichen 14 bezeichnet. Mit Bezugszeichen 10 ist ein Eisenpolkern (siehe auch Fig. 2), mit Bezugszeichen 20 eine Hülse, die das Magnetsystem insgesamt umgibt.In between, there is further provided a damping plate, which exceeds the dimensions of both the associated
Weiter sind dargestellt : ein Magnethaltering 22, der mit einer Aussparung für den Neodympolkem und einem Auflagerand für die Dämpfungsplatte 14 versehen ist, und eine untere Polplatte 24 schließlich ist zusammen mit Lötösen 46 im unteren Teil der Zeichnung dargestellt.Also shown are a
Bezugszeichen 42 bezeichnet eine Abdeckkappe für die Mitteltoneinheit, in die insbesondere das vierte Teil des Magnetsystems, ein Eisenring 38d, einpaßt. Bezugszeichen 44 bezeichnet einen Dichtungsring.
Das gesamte System bildet eine einbaufertige, jeweils separat abgedichtete Montageeinheit zur Überdeckung des Frequenzbereichs von 400 Hz bis 50 kHz.The entire system forms a ready-to-install, separately sealed mounting unit to cover the frequency range from 400 Hz to 50 kHz.
In Fig. 2 sind in einer Darstellung nur des Magnetaufbaus (ohne Spulen etc.) die beiden Magnetspalte, nämlich der des Mitteltöners, ein in der Zeichnung mit horizontal verlaufenden Feldlinien befindlicher Spalt 28 zwischen Polkern 38b und Polplatte 38c, und der Hochtönerspalt 18 (mit vertikalen Feldlinien in der Zeichnung zwischen der Neodym-Magnetplatte 40 und Frontplatte 16) dargestellt.In Fig. 2 are in a representation of only the magnetic structure (without coils, etc.), the two magnetic gaps, namely the midrange, located in the drawing with horizontally extending
Der Ebenenversatz ist mit 7 mm sehr klein gewählt, so daß erfolgreich im Zusammenspiel mit den bevorzugt im Breite-Länge Verhältnis von 1 : 5 parallel zueinander vorgesehenen fünf schlitzen ein bei zu großem Versatz entstehendes Phasing vermieden wird. Durch die geschlossene Bauart des erfindungsgemäßen Koaxiallautsprechers wird eine Vorsehung einer separaten Mitteltonkammer in einem den Lautsprecher aufnehmenden Lautsprecherchassis überflüssig.The plane offset is chosen to be very small at 7 mm, so that successful in conjunction with the preferably in the width-length ratio of 1: 5 parallel to each other provided five slots in a too large offset resulting phasing is avoided. Due to the closed design of the invention Koaxiallautsprechers is a Provision a separate mid-tone chamber in a loudspeaker receiving speaker loudspeaker superfluous.
Damit weist der erfindungsgemäße Koaxiallautsprecher neben der wellenförmigen Membranfolie 12 vor einer geschlossenen, rückseitigen Kammer für mindestens einen energiereichen Dauermagneten ein plattenförmiges, axial magnetisiertes Magnetelement 10 und eine Frontplatte auf, in der Schlitze so vor der Membranfolie 12 angeordnet sind, daß der erzeugte Schall gut austreten kann, gleichzeitig die Membranfolie auf engstem Raum gut mechanisch geschützt ist.Thus, the coaxial loudspeaker according to the invention in addition to the
Dabei sind die Mittelpunkte der schallerzeugenden, als Hochtöner genutzten wellenförmigen Membranfolie 12 und der weiteren Membraneinheit 30 vor der rückseitigen Kammer des als Mitteltöner genutzten Schwingsystems horizontal und vertikal auf einer Ebene gelegt und die Schlitze in der Frontplatte 16 im Bereich der Schallabstrahlung rechtwinklig zur Richtung der Falten der Membranfolie 12 angeordnet.The centers of the sound-producing, used as a tweeter
Durch fünf Schlitze 26 mit einem Breite - Länge Verhältnis von 1:5 parallel zueinander in einem rechteckigen Bereich wird der rechteckigen Membranfolie größtmöglicher Schalldurchtritt ermöglicht und gleichzeitig ein Symmetrie-Effekt, der sich auf den Schallgang auswirken könnte, vermieden. Die einzelnen Schlitze sollten deshalb auch abgerundet enden.By means of five
Als Magnetelement sollte eine rechtwinklige Neodymplatte 10 gewählt werden und zwischen Neodymplatte 10 und Membranfolie 12 eine Dämpfungsplatte 14 vorgesehen werden, wobei ein von einer die Wandung der geschlossenen Kammer bildenden Hülse 20 umschlossener Magnethaltering 22 zur von einer unteren Polplatte 24 beabstandeten Lagerung des Magnetelements 10 dient. Die magnetisch "weichen" Elemente 38d, 38c sind dann sowohl Bestandteile einer Flachmembran-Mitteltöner-Anordnung als auch eines Air-Motion-Hochtöner-Aufbaus.As a magnetic element, a right-
Claims (9)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE202004015635U DE202004015635U1 (en) | 2004-10-07 | 2004-10-07 | Coaxial speaker with wave-shaped membrane |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1646263A2 true EP1646263A2 (en) | 2006-04-12 |
| EP1646263A3 EP1646263A3 (en) | 2008-08-13 |
| EP1646263B1 EP1646263B1 (en) | 2010-07-21 |
Family
ID=33495497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05020885A Not-in-force EP1646263B1 (en) | 2004-10-07 | 2005-09-26 | Coaxial loudspeaker with waveform diaphragm |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1646263B1 (en) |
| AT (1) | ATE475271T1 (en) |
| DE (2) | DE202004015635U1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2180721A1 (en) | 2008-10-21 | 2010-04-28 | Lautsprecher Teufel GmbH | Flat membrane loudspeaker |
| ES2640322T3 (en) | 2012-05-09 | 2017-11-02 | Christensen Audio, Llc | Wide range and wide angle speaker transducer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5575398A (en) | 1978-12-04 | 1980-06-06 | Victor Co Of Japan Ltd | Electro-acoustic converter possessing folding diaphragm |
| US20040047478A1 (en) | 2002-09-09 | 2004-03-11 | Christopher Combest | Coaxial speaker with step-down ledge to eliminate sound wave distortions and time delay |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3636278A (en) * | 1969-02-19 | 1972-01-18 | Heil Scient Lab Inc | Acoustic transducer with a diaphragm forming a plurality of adjacent narrow air spaces open only at one side with the open sides of adjacent air spaces alternatingly facing in opposite directions |
| US4056697A (en) * | 1976-09-03 | 1977-11-01 | Oskar Heil | Movable diaphragm connector method flexible hinge diaphragm surround and electro-acoustic transducer with folded diaphragm with intermediate flexible portions |
| JPS587757Y2 (en) * | 1978-02-25 | 1983-02-10 | 澤藤 正 | Planar drive electric-acoustic mutual converter |
| AUPO832797A0 (en) * | 1997-07-30 | 1997-08-28 | Alsop, Glen | Electro-acoustic transducer |
| JPH11275678A (en) * | 1998-03-25 | 1999-10-08 | Sony Corp | Loudspeaker device |
| DE20207154U1 (en) * | 2002-05-07 | 2002-09-19 | Gerkinsmeyer, Norman, 89231 Neu-Ulm | Magnet system and driver |
-
2004
- 2004-10-07 DE DE202004015635U patent/DE202004015635U1/en not_active Expired - Lifetime
-
2005
- 2005-09-26 DE DE502005009938T patent/DE502005009938D1/en active Active
- 2005-09-26 EP EP05020885A patent/EP1646263B1/en not_active Not-in-force
- 2005-09-26 AT AT05020885T patent/ATE475271T1/en active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5575398A (en) | 1978-12-04 | 1980-06-06 | Victor Co Of Japan Ltd | Electro-acoustic converter possessing folding diaphragm |
| US20040047478A1 (en) | 2002-09-09 | 2004-03-11 | Christopher Combest | Coaxial speaker with step-down ledge to eliminate sound wave distortions and time delay |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1646263A3 (en) | 2008-08-13 |
| DE502005009938D1 (en) | 2010-09-02 |
| DE202004015635U1 (en) | 2004-12-02 |
| EP1646263B1 (en) | 2010-07-21 |
| ATE475271T1 (en) | 2010-08-15 |
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