EP3381199B1 - Electrodynamic sound transducer - Google Patents

Electrodynamic sound transducer Download PDF

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Publication number
EP3381199B1
EP3381199B1 EP16798793.2A EP16798793A EP3381199B1 EP 3381199 B1 EP3381199 B1 EP 3381199B1 EP 16798793 A EP16798793 A EP 16798793A EP 3381199 B1 EP3381199 B1 EP 3381199B1
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EP
European Patent Office
Prior art keywords
membrane
sound transducer
resonator
electrodynamic sound
opening
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EP16798793.2A
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German (de)
French (fr)
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EP3381199A1 (en
Inventor
Markus Kuhr
Kornelia Kaddig
Maik Schäfer
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Sonova Consumer Hearing GmbH
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Sonova Consumer Hearing GmbH
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Publication of EP3381199A1 publication Critical patent/EP3381199A1/en
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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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • 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
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1058—Manufacture or assembly
    • H04R1/1075—Mountings of transducers in earphones or headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • 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
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • 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
    • 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
    • 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
    • H04R1/2811—Enclosures comprising vibrating or resonating arrangements 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
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication

Definitions

  • the present invention relates to an electrodynamic sound transducer.
  • US 8,731,231 B2 shows an electrodynamic sound transducer.
  • the dynamic sound transducer has a chassis, a membrane with two beads, a voice coil and a magnet system.
  • the membrane has a hole in the middle.
  • a standing wave can arise between the sound-emitting electro-acoustic playback transducer and a head plane.
  • the frequency of this standing wave depends on the distance between the electroacoustic playback transducer and the head plane.
  • the frequency of the standing wave in circumaural headphones is typically between 5kHz - 8kHz. Since these frequencies are in the audible frequency range, the audio signal can be distorted.
  • WO 02/054826 A1 shows an electrodynamic sound transducer with a chassis, a membrane, a voice coil, a magnet system and a resonator.
  • the resonator has a first end with an opening at an ear-side end of the sound transducer and a second end at a side remote from the ear, and a volume between the first and second ends.
  • DE 10 2007 005 620 A1 shows a dynamic sound transducer with a chassis, a membrane, a voice coil, a magnet system and a resonator.
  • US 5,459,290A shows an electrodynamic sound transducer with a chassis, a membrane, a voice coil and a magnet system.
  • an angled alignment of the electrodynamic sound transducer is proposed.
  • U.S. 2005/238197 A1 shows an electrodynamic sound transducer with a chassis, a membrane, a voice coil, a magnet system and a resonator.
  • an electrodynamic sound transducer is provided with a chassis, a diaphragm with a hole in the middle of the diaphragm, a voice coil, a magnet system and a resonator which is arranged in the hole in the middle of the diaphragm.
  • the resonator has a first end with an opening at the ear end of the electrodynamic sound transducer and a second end at a non-aural side of the electrodynamic sound transducer and a volume between the first and second ends. The second end is closed.
  • a resonator is formed by the constriction at the first end of the resonator and by the volume located behind it.
  • the resonator can be designed as an acoustic absorption circuit or as a Helmholtz resonator.
  • the first end with the opening of the resonator is in a plane of the membrane.
  • the invention relates to the idea of providing an electrodynamic sound transducer with a chassis, a membrane with two beads, a voice coil and a magnet system.
  • the membrane does not have a dome, so that a hole is provided in the middle of the membrane.
  • a (selective) resonator for example in the form of an acoustic absorption circuit or a Helmholtz resonator, is provided in this area.
  • This resonator is dimensioned in such a way that the resonant frequency coincides with the standing wave.
  • this resonator is provided at the point where a calotte is usually provided.
  • the resonator has an opening on a side facing the ear and a volume located behind it.
  • the opening can be provided, for example, in the membrane plane.
  • the dynamic sound transducer has a chassis 130, a membrane 110 with two beads 110a, 110b, a voice coil 120 and a magnet system 140.
  • the membrane 110 has a hole 150 in the center.
  • the membrane 110 has an outer membrane pad 111 and an inner membrane pad 112 and a passage or hole 150 .
  • a first bead 110a is provided between the outer membrane support 111 and the coil seat 122, and a second bead 110b is provided between the coil seat 122 and the inner membrane support 112.
  • the dynamic sound transducer has a chassis 130, a membrane 110 with two beads 110a, 110b, a voice coil 120 and a magnet system 140.
  • the membrane 110 has two beads but no cap, ie a hole 150 is provided in the middle of the membrane.
  • the membrane system has an outer membrane pad 111 and an inner membrane pad 112 and a passage or hole 150 .
  • a first bead 110a is provided between the outer membrane support 111 and the coil seat 122, and a second bead 110b is provided between the coil seat 122 and the inner membrane support 112.
  • An electrodynamic sound transducer is thus provided with two beads 110a, 110b, but without a cap.
  • the two beads 110a, 110b are attached inside and outside to the chassis 130 of the dynamic converter.
  • a coil 120 for driving the Diaphragm 110 is provided on coil seat 122 between outer and inner beads 110a, 110b.
  • the membrane 110 is optionally stiff, which can be achieved by a corresponding contour of the membrane 110.
  • the membrane 110 can also optionally become softer towards the edge regions, ie the membrane supports 111, 112.
  • the dynamic sound transducer has a ring radiator with a vapor-coated foil (Duofol) in order to reduce the resonant frequency.
  • a broadband converter can thus be provided, which can be used in open headphones, for example.
  • a resonator 200 can be provided with a first end 210 with an opening 211, an opposite second end 230 and a volume 220 therebetween.
  • the opening 211 can be made smaller than the hole 150 in the membrane 110 .
  • the diameter of the opening 211 can be smaller than the diameter of the hole 150 .
  • the membrane 110 of the dynamic sound transducer can be vapour-deposited. Due to the increased circumference of the membrane 110, vibration modes can propagate more poorly. A uniform amplitude and frequency response can thus be obtained.
  • the chassis 130 may be circular or annular in shape.
  • the chassis 130 may have an inner end 132 and an outer end 131, each of which may be circular in shape.
  • the inner end 132 surrounds the hole 150 and receives the inner diaphragm pad 112 .
  • Outer end 131 receives outer membrane pad 111 .
  • the diaphragm 110 is thus attached to the inner and outer ends 132, 131 of the chassis 130.
  • the dynamic sound transducer has a chassis 130, a membrane 110 with two beads 110a, 110b, and a voice coil 120 Magnet system 140 and a hole 150 in the membrane, on which a cap is usually provided.
  • the membrane 110 according to the second exemplary embodiment is thus configured as a membrane without a dome.
  • a resonator 200 is provided in the region of the hole 150 (and within the inner end 132) in the region of the hole 150 (and within the inner end 132) .
  • the resonator 200 has a first end 210 with an opening 211 , a second end 230 and a volume 220 .
  • the first end 210 is provided at an ear-side end of the electrodynamic sound transducer and has an opening 211 .
  • the second end 230 is designed closed.
  • the opening 211 can be made smaller than the hole 150 .
  • the resonator 200 can be designed as an acoustic absorption circuit or as a Helmholtz resonator.
  • the opening 210 of the resonator 200 is located in the transducer axis and is arranged on the side of the transducer facing the ear.
  • the first end 210 is provided with the opening 211 in the membrane plane.
  • a volume 220 is formed between the first and second ends 210 , 230 and is only open through the opening 211 .
  • a sound velocity maximum occurs at the opening 211, as a result of which energy is withdrawn from the sound field which is generated by the electrodynamic sound transducer.
  • FIG 4 shows a first frequency response A of a transducer without the resonator and a second frequency response B for an electrodynamic sound transducer with a resonator according to the invention. Furthermore, in 4 a frequency response of the difference between the first and second frequency response A, B is shown. Thus, the effect of the resonator in particular can be seen well in the illustration below.
  • an acoustic resistance can be provided in or at the opening 211 of the resonator 200 for combating.
  • the chassis has an inner circular end and an outer circular end to which the diaphragm is attached.
  • An (acoustic) resonator affects the sound at a specific frequency or a specific frequency range.
  • the resonator can have a capacitive acoustic element and an inductive acoustic element.
  • the resonator may be configured as a single volume cavity resonator with a single opening to the ear canal.
  • an oscillatable membrane can be provided in or on the opening 211 of the resonator.
  • the sound transducer has a ring radiator.
  • the ring radiator comprises the chassis 130 with an inner open circular end 132 and an outer circular end 131, and a vibratable diaphragm 110 with a hole 150 in the center, inner and outer beads 110b, 110a and a coil seat 122.
  • the membrane 110 is held or attached to the inner and outer ends 132, 131 of the chassis.
  • a resonator 200 is provided within the inner open circular end 132 of the chassis 130 and within the hole 150.
  • the resonator can work as an absorber.
  • a resonator according to the invention is an oscillatable system whose components are tuned to a specific frequency (natural frequency) or frequency range so that the resonator oscillates when excited at this frequency or this frequency range.
  • the acoustic resonator according to the invention has a closed or partially open air volume. The elasticity of the air in a cavity, together with the mass inertia of the air, leads to certain resonance frequencies.
  • the Helmholtz resonator is a partially open cavity resonator.
  • the invention also relates to an earphone with a sound converter as described above.

Description

Die vorliegende Erfindung betrifft einen elektrodynamischen Schallwandler.The present invention relates to an electrodynamic sound transducer.

US 8,731,231 B2 zeigt einen elektrodynamischen Schallwandler. Der dynamische Schallwandler weist ein Chassis, eine Membran mit zwei Sicken, eine Schwingspule sowie ein Magnetsystem auf. Die Membran weist ein Loch in der Mitte auf. US 8,731,231 B2 shows an electrodynamic sound transducer. The dynamic sound transducer has a chassis, a membrane with two beads, a voice coil and a magnet system. The membrane has a hole in the middle.

Bei der Verwendung von Kopfhörern kann sich zwischen dem schallabstrahlenden elektroakustischen Wiedergabewandler und einer Kopfebene eine stehende Welle entstehen. Die Frequenz dieser stehenden Welle hängt von dem Abstand zwischen dem elektroakustischen Wiedergabewandler und der Kopfebene ab. Die Frequenz der stehenden Welle ist bei ohrumschließenden Kopfhörern typischerweise zwischen 5kHz - 8kHz. Da sich diese Frequenzen in dem hörbaren Frequenzbereich befinden, kann es hier zu einer Verfälschung des Audiosignals kommen.When using headphones, a standing wave can arise between the sound-emitting electro-acoustic playback transducer and a head plane. The frequency of this standing wave depends on the distance between the electroacoustic playback transducer and the head plane. The frequency of the standing wave in circumaural headphones is typically between 5kHz - 8kHz. Since these frequencies are in the audible frequency range, the audio signal can be distorted.

In der prioritätsbegründenden deutschen Patentanmeldung hat das Deutsche Patent- und Markenamt die folgenden Dokumente recherchiert: DE 10 2007 005 620 A1, WIKIPEDIA: Hohlraumresonator; 10. Sept. 2015 ; URL: de.wikipedia.org/w/index.php?; title=Hohlraum-resonator&oldid=145; 891576 und CH 400 239 A .The German Patent and Trademark Office has researched the following documents in the German patent application on which priority is based: DE 10 2007 005 620 A1, WIKIPEDIA: cavity resonator; 10 Sep 2015 ; URL: de.wikipedia.org/w/index.php?; title=Cavity-Resonator&oldid=145; 891576 and CH 400 239 A .

WO 02/054826 A1 zeigt einen elektrodynamischen Schallwandler mit einem Chassis, einer Membran, einer Schwingspule, einem Magnetsystem und einem Resonator. Der Resonator weist ein erstes Ende mit einer Öffnung an einem ohrseitigen Ende des Schallwandlers und ein zweites Ende an einer ohrabgewandten Seite sowie ein Volumen zwischen dem ersten und zweiten Ende auf. WO 02/054826 A1 shows an electrodynamic sound transducer with a chassis, a membrane, a voice coil, a magnet system and a resonator. The resonator has a first end with an opening at an ear-side end of the sound transducer and a second end at a side remote from the ear, and a volume between the first and second ends.

DE 10 2007 005 620 A1 zeigt einen dynamischen Schallwandler mit einem Chassis, einer Membran, einer Schwingspule, einem Magnetsystem und einem Resonator. DE 10 2007 005 620 A1 shows a dynamic sound transducer with a chassis, a membrane, a voice coil, a magnet system and a resonator.

US 5,459,290 A zeigt einen elektrodynamischen Schallwandler mit einem Chassis, einer Membran, einer Schwingspule und einem Magnetsystem. Insbesondere wird eine angewinkelte Ausrichtung des elektrodynamischen Schallwandlers vorgeschlagen. US 5,459,290A shows an electrodynamic sound transducer with a chassis, a membrane, a voice coil and a magnet system. In particular, an angled alignment of the electrodynamic sound transducer is proposed.

US 2005/238197 A1 zeigt einen elektrodynamischen Schallwandler mit einem Chassis, einer Membran, einer Schwingspule, einem Magnetsystem und einem Resonator. U.S. 2005/238197 A1 shows an electrodynamic sound transducer with a chassis, a membrane, a voice coil, a magnet system and a resonator.

Es ist eine Aufgabe der vorliegenden Erfindung, einen elektrodynamischen Schallwandler vorzusehen, welcher eine Verfälschung des wiederzugebenen Audiosignals verringert.It is an object of the present invention to provide an electrodynamic sound transducer which reduces corruption of the audio signal to be reproduced.

Diese Aufgabe wird durch einen elektrodynamischen Schallwandler nach Anspruch 1 gelöst.This object is achieved by an electrodynamic sound transducer according to claim 1.

Somit wird ein elektrodynamischer Schallwandler mit einem Chassis, einer Membran mit einem Loch in der Mitte der Membran, einer Schwingspule, einem Magnetsystem und einem Resonator vorgesehen, welcher in dem Loch in der Mitte der Membran angeordnet ist. Der Resonator weist ein erstes Ende mit einer Öffnung an dem ohrseitigen Ende des elektrodynamischen Schallwandlers und ein zweites Ende an einer ohrabgewandten Seite des elektrodynamischen Schallwandlers sowie ein Volumen zwischen dem ersten und zweiten Ende auf. Das zweite Ende ist geschlossen ausgestaltet. Durch die Verengung an dem ersten Ende des Resonators sowie durch das sich dahinter befindliche Volumen wird ein Resonator gebildet. Der Resonator kann als ein akustischer Saugkreis oder als ein Helmholtz-Resonator ausgestaltet sein.Thus, an electrodynamic sound transducer is provided with a chassis, a diaphragm with a hole in the middle of the diaphragm, a voice coil, a magnet system and a resonator which is arranged in the hole in the middle of the diaphragm. The resonator has a first end with an opening at the ear end of the electrodynamic sound transducer and a second end at a non-aural side of the electrodynamic sound transducer and a volume between the first and second ends. The second end is closed. A resonator is formed by the constriction at the first end of the resonator and by the volume located behind it. The resonator can be designed as an acoustic absorption circuit or as a Helmholtz resonator.

Gemäß einem weiteren Aspekt der vorliegenden Erfindung ist das erste Ende mit der Öffnung des Resonators in einer Ebene der Membran.According to a further aspect of the present invention, the first end with the opening of the resonator is in a plane of the membrane.

Die Erfindung betrifft den Gedanken, einen elektrodynamischen Schallwandler mit einem Chassis, einer Membran mit zwei Sicken, einer Schwingspule und einem Magnetsystem vorzusehen. Die Membran weist keine Kalotte auf, so dass ein Loch in der Mitte der Membran vorgesehen ist. In diesem Bereich wird erfindungsgemäß ein (selektiver) Resonator, beispielsweise in Form eines akustischen Saugkreises oder eines Helmholtz-Resonators, vorgesehen. Dieser Resonator ist derart dimensioniert, dass die Resonanzfrequenz mit der stehenden Welle zusammenfällt. Somit ist dieser Resonator an der Stelle vorgesehen, wo üblicherweise eine Kalotte vorgesehen ist.The invention relates to the idea of providing an electrodynamic sound transducer with a chassis, a membrane with two beads, a voice coil and a magnet system. The membrane does not have a dome, so that a hole is provided in the middle of the membrane. According to the invention, a (selective) resonator, for example in the form of an acoustic absorption circuit or a Helmholtz resonator, is provided in this area. This resonator is dimensioned in such a way that the resonant frequency coincides with the standing wave. Thus, this resonator is provided at the point where a calotte is usually provided.

Gemäß einem Aspekt der vorliegenden Erfindung weist der Resonator an einer Ohr zugewandten Seite eine Öffnung und ein sich dahinter befindliches Volumen auf. Die Öffnung kann beispielsweise in der Membranebene vorgesehen sein.According to one aspect of the present invention, the resonator has an opening on a side facing the ear and a volume located behind it. The opening can be provided, for example, in the membrane plane.

Weitere Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Further configurations of the invention are the subject matter of the dependent claims.

Vorteile und Ausführungsbeispiele der Erfindung werden nachstehend unter Bezugnahme auf die Zeichnung näher erläutert.

Fig. 1
zeigt eine perspektivische Ansicht eines elektrodynamischen Schall-wandlers gemäß einem ersten Ausführungsbeispiel,
Fig. 2
zeigt eine schematische Schnittansicht eines elektrodynamischen Schallwandlers gemäß dem ersten Ausführungsbeispiel,
Fig. 3
zeigt eine perspektivische Schnittansicht eines elektrodynamischen Schallwandlers gemäß einem zweiten Ausführungsbeispiels, und
Fig. 4
zeigt einen Frequenzgang eines elektrodynamischen Schallwandlers mit und ohne dem erfindungsgemäßen Resonator.
Advantages and exemplary embodiments of the invention are explained in more detail below with reference to the drawing.
1
shows a perspective view of an electrodynamic sound transducer according to a first embodiment,
2
shows a schematic sectional view of an electrodynamic sound transducer according to the first embodiment,
3
shows a perspective sectional view of an electrodynamic sound transducer according to a second embodiment, and
4
shows a frequency response of an electrodynamic sound transducer with and without the resonator according to the invention.

Fig. 1 zeigt eine perspektivische Ansicht eines elektrodynamischen Schallwandlers gemäß eines ersten Ausführungsbeispiel. Der dynamische Schallwandler weist ein Chassis 130, eine Membran 110 mit zwei Sicken 110a, 110b, eine Schwingspule 120 sowie ein Magnetsystem 140 auf. Die Membran 110 weist ein Loch 150 in der Mitte auf. Die Membran 110 weist eine äußere Membranauflage 111 und eine innere Membranauflage 112 sowie einen Durchgang bzw. ein Loch 150 auf. Zwischen der äußeren Membranauflage 111 und dem Spulensitz 122 ist eine erste Sicke 110a und zwischen dem Spulensitz 122 und der inneren Membranauflage 112 ist eine zweite Sicke 110b vorgesehen. 1 shows a perspective view of an electrodynamic sound transducer according to a first embodiment. The dynamic sound transducer has a chassis 130, a membrane 110 with two beads 110a, 110b, a voice coil 120 and a magnet system 140. The membrane 110 has a hole 150 in the center. The membrane 110 has an outer membrane pad 111 and an inner membrane pad 112 and a passage or hole 150 . A first bead 110a is provided between the outer membrane support 111 and the coil seat 122, and a second bead 110b is provided between the coil seat 122 and the inner membrane support 112.

Fig. 2 zeigt eine Schnittansicht eines dynamischen Schallwandlers gemäß einem ersten Ausführungsbeispiel. Der dynamische Schallwandler weist ein Chassis 130, eine Membran 110 mit zwei Sicken 110a, 110b, eine Schwingspule 120 sowie ein Magnetsystem 140 auf. Die Membran 110 weist dabei zwei Sicken, jedoch keine Kalotte auf, d.h. in der Mitte der Membran ist ein Loch 150 vorgesehen. 2 shows a sectional view of a dynamic sound transducer according to a first embodiment. The dynamic sound transducer has a chassis 130, a membrane 110 with two beads 110a, 110b, a voice coil 120 and a magnet system 140. The membrane 110 has two beads but no cap, ie a hole 150 is provided in the middle of the membrane.

Das Membransystem weist eine äußere Membranauflage 111 und eine innere Membranauflage 112 sowie einen Durchgang bzw. ein Loch 150 auf. Zwischen der äußeren Membranauflage 111 und dem Spulensitz 122 ist eine erste Sicke 110a und zwischen dem Spulensitz 122 und der inneren Membranauflage 112 ist eine zweite Sicke 110b vorgesehen.The membrane system has an outer membrane pad 111 and an inner membrane pad 112 and a passage or hole 150 . A first bead 110a is provided between the outer membrane support 111 and the coil seat 122, and a second bead 110b is provided between the coil seat 122 and the inner membrane support 112.

Somit wird ein elektrodynamischer Schallwandler mit zwei Sicken 110a, 110b, jedoch ohne Kalotte vorzusehen. Die beiden Sicken 110a, 110b werden dabei innen und außen am Chassis 130 des dynamischen Wandlers befestigt. Eine Spule 120 zum Antrieb der Membran 110 wird am Spulensitz 122 zwischen der äußeren und inneren Sicke 110a, 110b vorgesehen. In dem Bereich der Membran, wo die Spule angeordnet ist, d. h. am Spulensitz 122, ist die Membran 110 optional steif ausgeführt, was durch eine entsprechende Kontur der Membran 110 erreicht werden kann. Die Membran 110 kann ferner optional zu den Randbereichen, d. h. den Membranauflagen 111, 112, hin weicher werden.An electrodynamic sound transducer is thus provided with two beads 110a, 110b, but without a cap. The two beads 110a, 110b are attached inside and outside to the chassis 130 of the dynamic converter. A coil 120 for driving the Diaphragm 110 is provided on coil seat 122 between outer and inner beads 110a, 110b. In the area of the membrane where the coil is arranged, ie on the coil seat 122, the membrane 110 is optionally stiff, which can be achieved by a corresponding contour of the membrane 110. The membrane 110 can also optionally become softer towards the edge regions, ie the membrane supports 111, 112.

Der dynamische Schallwandler gemäß einem ersten Ausführungsbeispiel weist einen Ringradiator mit einer bedampften Folie (Duofol) auf, um die Resonanzfrequenz zu reduzieren. Somit kann ein Breitbandwandler vorgesehen werden, welcher beispielsweise in einem offenen Kopfhörer verwendet werden kann.The dynamic sound transducer according to a first exemplary embodiment has a ring radiator with a vapor-coated foil (Duofol) in order to reduce the resonant frequency. A broadband converter can thus be provided, which can be used in open headphones, for example.

Im Bereich des Lochs 150 kann ein Resonator 200 mit einem ersten Ende 210 mit einer Öffnung 211, einem gegenüberliegenden zweiten Ende 230 und einem Volumen 220 dazwischen vorgesehen sein.In the area of the hole 150, a resonator 200 can be provided with a first end 210 with an opening 211, an opposite second end 230 and a volume 220 therebetween.

Optional kann die Öffnung 211 kleiner als das Loch 150 in der Membran 110 ausgestaltet sein. Optional kann der Durchmesser der Öffnung 211 kleiner als der Durchmesser des Loches 150 sein.Optionally, the opening 211 can be made smaller than the hole 150 in the membrane 110 . Optionally, the diameter of the opening 211 can be smaller than the diameter of the hole 150 .

Die Membran 110 des dynamischen Schallwandlers kann bedampft werden. Durch den vergrößerten Umfang der Membran 110 können Schwingungsmoden sich schlechter ausbreiten. Somit kann ein gleichmäßiger Amplituden- und Frequenzgang erhalten werden.The membrane 110 of the dynamic sound transducer can be vapour-deposited. Due to the increased circumference of the membrane 110, vibration modes can propagate more poorly. A uniform amplitude and frequency response can thus be obtained.

Das Chassis 130 kann kreisförmig oder ringförmig ausgestaltet sein. Das Chassis 130 kann ein inneres Ende 132 und eine äußeres Ende 131 aufweisen, welche jeweils kreisförmig ausgestaltet sein können. Das innere Ende 132 umgibt das Loch 150 und nimmt die innere Membranauflage 112 auf. Das äußere Ende 131 nimmt die äußere Membranauflage 111 auf. Die Membran 110 ist somit an dem inneren und dem äußeren Ende 132, 131 des Chassis 130 befestigt. In der Mitte, d.h. innerhalb des inneren Endes 132 und des Loches 150 wird der Resonator 200 vorgesehen.The chassis 130 may be circular or annular in shape. The chassis 130 may have an inner end 132 and an outer end 131, each of which may be circular in shape. The inner end 132 surrounds the hole 150 and receives the inner diaphragm pad 112 . Outer end 131 receives outer membrane pad 111 . The diaphragm 110 is thus attached to the inner and outer ends 132, 131 of the chassis 130. FIG. In the middle, i.e. inside the inner end 132 and the hole 150, the resonator 200 is provided.

Fig. 3 zeigt eine perspektivische Schnittansicht eines elektrondynamischen Schallwandlers gemäß einem zweiten Ausführungsbeispiel. Der dynamische Schallwandler weist ein Chassis 130, eine Membran 110 mit zwei Sicken 110a, 110b, eine Schwingspule 120, ein Magnetsystem 140 und ein Loch 150 in der Membran auf, an welcher üblicherweise eine Kalotte vorgesehen ist. 3 shows a perspective sectional view of an electrodynamic sound transducer according to a second embodiment. The dynamic sound transducer has a chassis 130, a membrane 110 with two beads 110a, 110b, and a voice coil 120 Magnet system 140 and a hole 150 in the membrane, on which a cap is usually provided.

Die Membran 110 gemäß dem zweiten Ausführungsbeispiel ist somit als eine kalottenlose Membran ausgestaltet. In dem Bereich des Loches 150 (und innerhalb des inneren Endes 132) ist ein Resonator 200 vorgesehen. Der Resonator 200 weist ein erstes Ende 210 mit einer Öffnung 211, ein zweites Ende 230 sowie ein Volumen 220 auf. Das erste Ende 210 ist an einem ohrseitigen Ende des elektrodynamischen Schallwandlers vorgesehen und weist eine Öffnung 211 auf. Das zweite Ende 230 ist verschlossen ausgestaltet. Die Öffnung 211 kann kleiner als das Loch 150 ausgestaltet sein.The membrane 110 according to the second exemplary embodiment is thus configured as a membrane without a dome. In the region of the hole 150 (and within the inner end 132) a resonator 200 is provided. The resonator 200 has a first end 210 with an opening 211 , a second end 230 and a volume 220 . The first end 210 is provided at an ear-side end of the electrodynamic sound transducer and has an opening 211 . The second end 230 is designed closed. The opening 211 can be made smaller than the hole 150 .

Der Resonator 200 gemäß der Erfindung kann als ein akustischer Saugkreis oder als ein Helmholtz-Resonator ausgestaltet sein. Die Öffnung 210 des Resonators 200 befindet sich gemäß der Erfindung in der Wandlerachse und ist an der ohrzugewandten Seite des Wandlers angeordnet.The resonator 200 according to the invention can be designed as an acoustic absorption circuit or as a Helmholtz resonator. According to the invention, the opening 210 of the resonator 200 is located in the transducer axis and is arranged on the side of the transducer facing the ear.

Gemäß der Erfindung ist das erste Ende 210 mit der Öffnung 211 in der Membranebene vorgesehen. Zwischen dem ersten und zweiten Ende 210, 230 ist ein Volumen 220 ausgebildet, welches nur durch die Öffnung 211 geöffnet ist.According to the invention, the first end 210 is provided with the opening 211 in the membrane plane. A volume 220 is formed between the first and second ends 210 , 230 and is only open through the opening 211 .

Bei der Resonanzfrequenz des Resonators entsteht an der Öffnung 211 ein Schallschnellemaximum, durch das dem Schallfeld, welches durch den elektrodynamischen Schallwandler erzeugt wird, Energie entzogen wird.At the resonant frequency of the resonator, a sound velocity maximum occurs at the opening 211, as a result of which energy is withdrawn from the sound field which is generated by the electrodynamic sound transducer.

In Fig. 4 ist ein erster Frequenzgang A eines Wandlers ohne den Resonator und ein zweiter Frequenzgang B für einen elektrodynamischen Schallwandler mit einem erfindungsgemäßen Resonator dargestellt. Ferner ist in Fig. 4 ein Frequenzgang der Differenz zwischen dem ersten und zweiten Frequenzgang A, B dargestellt. Somit ist in der unteren Darstellung insbesondere die Wirkung des Resonators gut zu sehen.In 4 shows a first frequency response A of a transducer without the resonator and a second frequency response B for an electrodynamic sound transducer with a resonator according to the invention. Furthermore, in 4 a frequency response of the difference between the first and second frequency response A, B is shown. Thus, the effect of the resonator in particular can be seen well in the illustration below.

Optional kann in oder an der Öffnung 211 des Resonators 200 zur Bekämpfung ein akustischer Widerstand vorgesehen werden.Optionally, an acoustic resistance can be provided in or at the opening 211 of the resonator 200 for combating.

Gemäß einem Aspekt der Erfindung weist das Chassis ein inneres kreisförmiges Ende und eine äußeres kreisförmiges Ende auf, an welchen die Membran befestigt ist.According to one aspect of the invention, the chassis has an inner circular end and an outer circular end to which the diaphragm is attached.

Ein (akustischer) Resonator gemäß der Erfindung beeinflusst den Schall bei einer bestimmten Frequenz oder einem bestimmten Frequenzbereich. Der Resonator kann ein kapazitives akustisches Element und eine induktives akustisches Element aufweisen. Gemäß einem Aspekt der Erfindung kann der Resonator als ein Hohlraumresonator mit einem Volumen mit einer einzigen Öffnung zum Ohrkanal hin ausgestaltet sein.An (acoustic) resonator according to the invention affects the sound at a specific frequency or a specific frequency range. The resonator can have a capacitive acoustic element and an inductive acoustic element. In accordance with one aspect of the invention, the resonator may be configured as a single volume cavity resonator with a single opening to the ear canal.

Optional kann eine schwingungsfähige Membran in oder an der Öffnung 211 des Resonators vorgesehen sein.Optionally, an oscillatable membrane can be provided in or on the opening 211 of the resonator.

Gemäß einem Aspekt der Erfindung weist der Schallwandler einen Ringradiator auf. Der Ringradiator weist das Chassis 130 mit einem inneren offenen kreisförmigen Ende 132 und einem äußeren kreisförmigen Ende 131, und eine schwingfähige Membran 110 mit einem Loch 150 in der Mitte, einer inneren und einer äußeren Sicke 110b, 110a und einem Spulensitz 122 auf. Die Membran 110 ist an dem inneren und äußeren Ende 132, 131 des Chassis gehalten oder befestigt. Innerhalb des inneren offenen kreisförmigen Endes 132 des Chassis 130 und innerhalb des Loches 150 ist ein Resonator 200 vorgesehen.According to one aspect of the invention, the sound transducer has a ring radiator. The ring radiator comprises the chassis 130 with an inner open circular end 132 and an outer circular end 131, and a vibratable diaphragm 110 with a hole 150 in the center, inner and outer beads 110b, 110a and a coil seat 122. The membrane 110 is held or attached to the inner and outer ends 132, 131 of the chassis. Within the inner open circular end 132 of the chassis 130 and within the hole 150, a resonator 200 is provided.

Der Resonator kann als Absorber arbeiten.The resonator can work as an absorber.

Ein Resonator gemäß der Erfindung ist ein schwingfähiges System, dessen Komponenten auf eine bestimmte Frequenz (Eigenfrequenz) oder Frequenzbereich abgestimmt sind, dass der Resonator bei Anregung mit dieser Frequenz oder dieses Frequenzbereiches ausschwingt. Der akustische Resonator gemäß der Erfindung weist ein abgeschlossenes oder teilweise offenes Luftvolumen auf. Die Elastizität der Luft in einem Hohlraum führt zusammen mit der Massenträgheit der Luft zu bestimmten Resonanzfrequenzen. Der Helmholtz-Resonator ist ein teilweise offener Hohlraumresonator.A resonator according to the invention is an oscillatable system whose components are tuned to a specific frequency (natural frequency) or frequency range so that the resonator oscillates when excited at this frequency or this frequency range. The acoustic resonator according to the invention has a closed or partially open air volume. The elasticity of the air in a cavity, together with the mass inertia of the air, leads to certain resonance frequencies. The Helmholtz resonator is a partially open cavity resonator.

Die Erfindung betrifft ebenfalls einen Hörer mit einem oben beschriebenen Schallwandler.The invention also relates to an earphone with a sound converter as described above.

Claims (6)

  1. Electrodynamic sound transducer for headphones, having
    a chassis (130) with an inner open end (132) and an outer end (131),
    a membrane (110) with a hole (150) in a center of the membrane (110) and a bobbin (122), wherein the membrane (110) is fixed at the inner open end (132) and at the outer end (131),
    a coil (120), which is coupled to the membrane at the bobbin (122),
    a magnet system (140) and
    a resonator (200), which is arranged within the inner open end (132) of the chassis (130) and in the hole (150) in the center of the membrane (110),
    wherein the resonator (200) has a first end (210) with an opening (211) at an ear side end of the electrodynamic sound transducer and a second end (230) at an end of the electrodynamic sound transducer away from the ear, and a volume (220) between the first and second end (210,230),
    wherein the second end (230) is closed,
    wherein the resonator (200) is dimensioned such that a resonance frequency matches a standing wave generated between the sound emitting electrodynamic sound transducer and a head plane of a user,
    wherein the standing wave has a frequency between 5 kHz and 8 kHz.
  2. Electrodynamic sound transducer according to claim 1,
    wherein the opening (211) is smaller than the hole (150) in the center of the membrane (110).
  3. Electrodynamic sound transducer according to claim 1,
    wherein the resonator (200) is an acoustic suction circuit or a Helmholtz resonator.
  4. Electrodynamic sound transducer according to claim 2 or 3,
    wherein the first end (210) with the opening (211) is in a plane of the membrane (110).
  5. Electrodynamic sound transducer according to one of the claims 1 through 4,
    wherein an acoustic resistance member is provided in the opening (211).
  6. Receiver, with an electrodynamic sound transducer according to one of the claims 1 through 5.
EP16798793.2A 2015-11-27 2016-11-23 Electrodynamic sound transducer Active EP3381199B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015120637.4A DE102015120637A1 (en) 2015-11-27 2015-11-27 Electrodynamic transducer
PCT/EP2016/078559 WO2017089401A1 (en) 2015-11-27 2016-11-23 Electrodynamic sound transducer

Publications (2)

Publication Number Publication Date
EP3381199A1 EP3381199A1 (en) 2018-10-03
EP3381199B1 true EP3381199B1 (en) 2022-07-06

Family

ID=57389461

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Application Number Title Priority Date Filing Date
EP16798793.2A Active EP3381199B1 (en) 2015-11-27 2016-11-23 Electrodynamic sound transducer

Country Status (5)

Country Link
US (1) US10721567B2 (en)
EP (1) EP3381199B1 (en)
CN (1) CN108293160B (en)
DE (1) DE102015120637A1 (en)
WO (1) WO2017089401A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL255013A (en) * 1959-08-21
JP3057731B2 (en) 1990-08-21 2000-07-04 ソニー株式会社 Electroacoustic transducer and sound reproduction system
CN2217861Y (en) 1994-04-16 1996-01-17 家电宝实业有限公司 Phase-reversal loudspeaking device
EP1356708B1 (en) 2001-01-04 2005-08-17 Danish Sound Technology A/S Double-dome speaker
US7031488B2 (en) 2004-04-23 2006-04-18 Sun Technique Electric Co., Ltd. Super tweeter
DE102007005620B4 (en) * 2007-01-31 2011-05-05 Sennheiser Electronic Gmbh & Co. Kg Dynamic sound transducer, earpiece and headset
WO2011047435A1 (en) * 2009-10-23 2011-04-28 Tubrick Technologies Pty Ltd Loudspeaker assembly and system

Also Published As

Publication number Publication date
CN108293160A (en) 2018-07-17
WO2017089401A1 (en) 2017-06-01
CN108293160B (en) 2020-04-03
EP3381199A1 (en) 2018-10-03
DE102015120637A1 (en) 2017-06-14
US20180332401A1 (en) 2018-11-15
US10721567B2 (en) 2020-07-21

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