EP1039777A2 - Small microphone - Google Patents

Small microphone Download PDF

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Publication number
EP1039777A2
EP1039777A2 EP00890091A EP00890091A EP1039777A2 EP 1039777 A2 EP1039777 A2 EP 1039777A2 EP 00890091 A EP00890091 A EP 00890091A EP 00890091 A EP00890091 A EP 00890091A EP 1039777 A2 EP1039777 A2 EP 1039777A2
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EP
European Patent Office
Prior art keywords
microphone
membrane
microphone according
component
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00890091A
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German (de)
French (fr)
Other versions
EP1039777A3 (en
EP1039777B1 (en
Inventor
Hugo Dr. Lenhard-Backhaus
Richard Pribyl
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AKG Acoustics GmbH
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AKG Acoustics GmbH
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Filing date
Publication date
Application filed by AKG Acoustics GmbH filed Critical AKG Acoustics GmbH
Publication of EP1039777A2 publication Critical patent/EP1039777A2/en
Publication of EP1039777A3 publication Critical patent/EP1039777A3/en
Application granted granted Critical
Publication of EP1039777B1 publication Critical patent/EP1039777B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/023—Transducers incorporated in garment, rucksacks or the like

Definitions

  • the invention relates to small and very small microphones that on clothing or often even directly on the body, for example in the hair. These microphones usually have one, but more rarely two or more membranes on, mostly via recess in the jacket of the cylindrical Microphones are sitting. With this design between a face plate and a base plate and the jacket with the openings that are covered by the membranes an inner cavity created for the acoustic Properties of the microphone is necessary and essential.
  • A is preferred as the component with high acoustic impedance Pressure compensation tube with an inner diameter in the Range of about 70 ⁇ m and a length of 3 to 4 mm, but it is also conceivable to kind of stubble out open pore foam or the like to use if also preferred the tube from an acoustic point of view becomes.
  • the limp closing membrane only has to be impermeable to moisture and be as weak as possible, i.e. without Preload must be designed and installed and only serves to separate the compensation volume from the environment and protect.
  • the ones usual in the field of electroacoustics used materials so for that limp membrane for example polycarbonate, polyurethane, Rubber or elastomers, but also metal foils and for that Tubes of corrosion-resistant materials such as Nickel silver, corrosion-resistant steel (Nirosta) or plastic.
  • the invention is shown schematically in the drawing. The only figure shows an axial section through a greatly enlarged microphone according to the invention.
  • the size of the microphone should point this out be that its length L is about 7 mm and largest diameter D is about 4.5 mm.
  • a Pressure equalization tube 4 arranged, according to his Dimensions and its material have a high acoustic Has impedance so that it acts as a low pass filter. This ensures that the vibrations of the membranes 33 ', which transmit in the audible frequency range are too high-frequency to be noticeable pulsating flow of air from the inner cavity 7 through the tube 4 to an equalizing cavity 8 cause.
  • the compensation cavity 8 is in the embodiment shown through a recess in the front panel 9 of the Housing 2 is formed and is by a limp protective membrane 6 sealed off from the environment.
  • a limp protective membrane 6 sealed off from the environment.
  • an annular one Component 10 provided on the end plate 9, the preferably also as a fastener for the flap protective membrane 6 is used.
  • the pressure compensation tube 4 is preferably by means of a Insulator 5 held in the end plate 9, so to be vibration-free and acoustically neutral and the acoustic properties of the microphone as little as possible to influence.
  • the invention is of course not based on the illustrated Embodiment limited, but can be modified in various ways. So it can solution according to the invention also in microphones with only one Membrane is used, no tube has to be used but, as mentioned above, can be a other component with high acoustic impedance can be used, where appropriate also a combination of such a for example sponge-like component and one shorter tubes can be used.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

A small microphone (1) which can be worn on clothing or on the body comprises a base plate (2) and a top plate (9), and an intermediate mantle (3) with an opening which is covered by a membrane (3'). The microphone has an inner hollow chamber (7) connected to an equalization chamber (8) via a high acoustic impedance component. The equalization chamber is sealed by a loose membrane (6).

Description

Die Erfindung betrifft kleine und kleinste Mikrophone, die an der Kleidung oder oft sogar direkt am Körper, beispielsweise im Haar, getragen werden. Diese Mikrophone weisen zumeist eine, seltener aber zwei oder mehr Membranen auf, die zumeist über Ausnehmung im Mantel des zylinderförmigen Mikrophons sitzen. Durch diese Bauweise wird zwischen einer Stirn- und einer Bodenplatte und dem Mantel mit den Öffnungen, die von den Membranen abgedeckt werden, ein innerer Hohlraum geschaffen, der für die akustischen Eigenschaften des Mikrophons notwendig und wesentlich ist.The invention relates to small and very small microphones that on clothing or often even directly on the body, for example in the hair. These microphones usually have one, but more rarely two or more membranes on, mostly via recess in the jacket of the cylindrical Microphones are sitting. With this design between a face plate and a base plate and the jacket with the openings that are covered by the membranes an inner cavity created for the acoustic Properties of the microphone is necessary and essential.

Wesentlich für diesen inneren Hohlraum ist es, einen Druck aufzuweisen, der möglichst genau dem statischen Umgebungsdruck entspricht, um die Membranen in der Ruhelage in einer vorbestimmten und genau definierten Lage und in einem ebenso definierten Spannungszustand zu halten.What is essential for this inner cavity is a pressure to show the static environmental pressure as precisely as possible corresponds to the membranes at rest in a predetermined and precisely defined position and in maintain an equally defined state of tension.

Um dieses Ziel zu erreichen, hat man bisher meistens im Bereich der Membranenhalterung, oder auch in den Membranen direkt, kleine Öffnungen vorgesehen, durch die ein solcher Druckausgleich erfolgen konnte.In order to achieve this goal, one has mostly in the Area of the membrane holder, or also in the membranes directly, small openings are provided through which such Pressure equalization could take place.

Durch die speziellen Verwendungen, denen diese Mikrophone unterworfen werden, kommt es aber immer wieder dazu, daß Feuchtigkeit durch diese Öffnungen in den inneren Hohlraum gelangt und dort kondensiert und zu Problemen für die Membrane und die anderen Bauteile führt. Man muß dabei ja bedenken, daß diese Mikrophone, beispielsweise während Gesangsauftritten oder Theater- oder Musicalvorführungen von den Schauspielern direkt auf der Haut oder im Haar getragen werden, sodaß sie diesbezüglich weit stärkeren Anfechtungen ausgesetzt sind als übliche Mikrophone. Man erkennt dies auch daran, daß die durchschnittliche Lebensdauer derartiger Mikrophone im Theaterbetrieb bei kaum einem Monat liegt, wodurch auch ein starkes wirtschaftliches Interesse daran gegeben ist, diese Probleme zu lösen.Due to the special uses that these microphones subject, it always happens that Moisture through these openings in the inner cavity reached and condensed there and problems for the membrane and leads the other components. You have to do it keep in mind that these microphones, for example during Singing performances or theater or musical performances by the actors directly on the skin or in the hair are worn so that they are much stronger in this regard Challenges are more common than usual microphones. Man this also recognizes that the average lifespan such microphones in theater operations at hardly one month, which also makes it a strong economic There is interest in solving these problems.

Es ist dabei zu bedenken, daß sowohl die Länge als auch der Durchmesser des fertig montierten Mikrophones nur wenige Millimeter beträgt.It should be borne in mind that both the length and the diameter of the fully assembled microphone only is a few millimeters.

Dies bezweckt die vorliegende Erfindung und schlägt zu diesem Zwecke vor, den inneren Hohlraum mittels eines Bauteiles hoher akustischer Impedanz mit einem Ausgleichshohlraum zu verbinden, der gegenüber der Umgebung durch eine schlappe Membran feuchtigkeitsdicht abgeschlossen ist.This is the purpose of the present invention and strikes this purpose, the inner cavity by means of a component high acoustic impedance with a compensation cavity to connect that through to the environment a limp membrane sealed moisture-proof is.

Durch diese Maßnahme erreicht man einen vollständigen Abschluß des Mikrophoninneren nach außen. Weiters erreicht man durch den Bauteil mit hoher akustischer Impedanz, der im vorliegenden Fall ähnlich wie ein Tiefpassfilter arbeitet, daß die akustischen Eigenschaften des inneren Hohlraumes und damit des gesamten Mikrophons sich nicht ändern, da bei den im Betrieb aufzunehmenden Frequenzen durch die hohe Impedanz des Verbindungsbauteiles dieser Bauteil wie eine geschlossene Wand wirkt.This measure leads to a complete one Termination of the inside of the microphone. Achieved further one through the component with high acoustic impedance, the works similarly to a low-pass filter in the present case, that the acoustic properties of the inner cavity and therefore the entire microphone itself change because of the frequencies to be recorded during operation due to the high impedance of the connecting component Component looks like a closed wall.

Schließlich erreicht man durch das Ausgleichsvolumen und die schlappe Membran, daß der Umgebungsdruck diese Membrane so weit deformiert, daß im Inneren des Mikrophons stets der statische Umgebungsdruck herrscht.Finally, through the equalization volume and the limp membrane that the ambient pressure this membrane deformed so far that inside the microphone the static ambient pressure always prevails.

Als Bauteil hoher akustischer Impedanz wird bevorzugt ein Druckausgleichsröhrchen mit einem Innendurchmesser im Bereich von etwa 70 um und einer Länge von 3 bis 4 mm verwendet, doch ist es auch denkbar, eine Art Stoppel aus offenporigem Schaumstoff oder ähnlichem zu verwenden, wenn auch das Röhrchen vom akustischen Standpunkt her bevorzugt wird. A is preferred as the component with high acoustic impedance Pressure compensation tube with an inner diameter in the Range of about 70 µm and a length of 3 to 4 mm, but it is also conceivable to kind of stubble out open pore foam or the like to use if also preferred the tube from an acoustic point of view becomes.

Die schlappe Abschlußmembran muß eigentlich nur feuchtigkeitsundurchlässig und möglichst schlapp sein, d.h. ohne Vorspannung ausgebildet und eingebaut sein und dient nur dazu, das Ausgleichsvolumen gegenüber der Umgebung abzutrennen und zu schützen.The limp closing membrane only has to be impermeable to moisture and be as weak as possible, i.e. without Preload must be designed and installed and only serves to separate the compensation volume from the environment and protect.

Es können für die erfindungsgemäß verwendeten neuen Bauteile, die im Gebiet der Elektroakustik üblichen bisher verwendeten Materialien verwendet werden, so für die schlappe Membran beispielsweise Polycarbonat, Polyurethan, Gummi oder Elastomere, aber auch Metallfolien und für das Röhrchen korrosionsbeständige Materialien wie z.Bsp. Neusilber, korrosionsbeständigen Stahl (Nirosta) oder Kunststoff.For the new components used according to the invention, the ones usual in the field of electroacoustics used materials, so for that limp membrane for example polycarbonate, polyurethane, Rubber or elastomers, but also metal foils and for that Tubes of corrosion-resistant materials such as Nickel silver, corrosion-resistant steel (Nirosta) or plastic.

Der Aufbau des Mikrophons ist in der Zeichnung nur soweit dargestellt und wird im folgenden nur soweit beschrieben, wie es für das Verständnis der Erfindung notwendig ist. Die anderen, dem Stand der Technik entsprechenden Bauteile sind dem Fachmann bekannt und bedürfen daher keiner Erläuterung.The structure of the microphone is only so far in the drawing is shown and is only described as far below, as is necessary for understanding the invention. The other state-of-the-art components are known to the person skilled in the art and therefore do not require any explanation.

In der Zeichnung ist die Erfindung schematisch dargestellt. Die einzige Figur zeigt einen Axialschnitt durch ein stark vergrößertes erfindungsgemäßes Mikrophon. Zur lIlustrierung der Größe des Mikrophons soll darauf hingewiesen werden, daß seine Länge L etwa 7 mm und sein größter Durchmesser D etwa 4,5 mm beträgt.The invention is shown schematically in the drawing. The only figure shows an axial section through a greatly enlarged microphone according to the invention. For Illustration of the size of the microphone should point this out be that its length L is about 7 mm and largest diameter D is about 4.5 mm.

Wie aus der Zeichnung ersichtlich ist, besteht eines einer Gesamtheit mit 1 bezeichnetes Mikrophon im wesentlichen aus einem Gehäuse 2 und zwei Membranen 33'. Diese Membranen sind am Umfang von Öffnungen im Gehäuse dicht montiert, sodaß ein innerer Hohlraum 7 gebildet wird, der allseits entweder von den Membranen 33' oder dem Gehäuse 1 umhüllt ist. As can be seen from the drawing, there is one Entire microphone designated with 1 essentially from a housing 2 and two membranes 33 '. These membranes are tightly mounted on the circumference of openings in the housing, so that an inner cavity 7 is formed which either side of the diaphragms 33 'or the housing 1 is enveloped.

Erfindungsgemäß ist nun, beim dargestellten Ausführungsbeispiel in der Stirnfläche 9 des Gehäuses 2, ein Druckausgleichröhrchen 4 angeordnet, das zufolge seiner Abmessungen und seines Materials eine hohe akustische Impedanz aufweist, sodaß es als Tiefpassfilter wirkt. Dadurch wird sichergestellt, daß die Schwingungen der Membranen 33', die ja im hörbaren Frequenzbereich übertragen werden sollen, zu hochfrequent sind, um eine merkliche pulsierende Strömung von Luft aus dem inneren Hohlraum 7 durch das Röhrchen 4 zu einem Ausgleichshohlraum 8 zu bewirken.According to the invention is now, in the illustrated embodiment in the end face 9 of the housing 2, a Pressure equalization tube 4 arranged, according to his Dimensions and its material have a high acoustic Has impedance so that it acts as a low pass filter. This ensures that the vibrations of the membranes 33 ', which transmit in the audible frequency range are too high-frequency to be noticeable pulsating flow of air from the inner cavity 7 through the tube 4 to an equalizing cavity 8 cause.

Der Ausgleichshohlraum 8, wird im gezeigten Ausführungsbeispiel durch eine Vertiefung in der Frontplatte 9 des Gehäuses 2 gebildet und ist durch eine schlappe Schutzmembran 6 gegenüber der Umgebung dicht abgeschlossen. Um die Schutzmembran 6 mechanisch zu schützen ist ein ringförmiger Bauteil 10 auf der Stirnplatte 9 vorgesehen, der bevorzugterweise auch als Befestigungsmittel für die schlappe Schutzmembran 6 dient.The compensation cavity 8 is in the embodiment shown through a recess in the front panel 9 of the Housing 2 is formed and is by a limp protective membrane 6 sealed off from the environment. To the Protecting the protective membrane 6 mechanically is an annular one Component 10 provided on the end plate 9, the preferably also as a fastener for the flap protective membrane 6 is used.

Das Druckausgleichröhrchen 4 wird bevorzugt mittels eines Isolators 5 in der Stirnplatte 9 gehalten, um so schwingungstechnisch und akustisch neutral zu sein und die akustischen Eigenschaften des Mikrophons möglichst wenig zu beeinflussen.The pressure compensation tube 4 is preferably by means of a Insulator 5 held in the end plate 9, so to be vibration-free and acoustically neutral and the acoustic properties of the microphone as little as possible to influence.

Wenn nun in der Umgebung 11 des Mikrophons eine Änderung des Luftdrucks erfolgt, so deformiert sich die schlappe Schutzmembran 6 analog dazu, beispielsweise bei einer Erhöhung des Luftdruckes deformiert sie sich in Richtung zum inneren Hohlraum 7 hin, solange, bis durch die Verkleinerung des gesamten Volumens des inneren Hohlraums 7 und des Ausgleichvolumens 8 wieder Gleichgewicht herrscht. If there is a change in the vicinity 11 of the microphone the air pressure occurs, the slag deforms Protective membrane 6 analogously to this, for example in the case of a Increasing the air pressure deforms them in the direction towards the inner cavity 7 until the reduction of the total volume of the inner cavity 7 and the compensating volume 8 there is equilibrium again.

Da die schlappe Schutzmembran 6 einer solchen Deformation möglichst keinen elastischen Widerstand entgegensetzt, erfolgt dieser Druckausgleich im wesentlichen ohne die eigentlichen Membranen 33' zu deformieren oder ihre Vorspannung zu ändern.Because the limp protective membrane 6 of such a deformation as far as possible no elastic resistance occurs this pressure equalization essentially without the actual membranes 33 'to deform or their bias to change.

Auf diese Weise erreicht man die eingangs genannten Ziele und schafft ein Mikrophon, bei dem ein Feuchtigkeitszutritt ohne Zerstörung oder zumindest Beschädigung eines Bauteils praktisch ausgeschlossen ist.In this way you can achieve the goals mentioned at the beginning and creates a microphone where moisture can enter without destroying or at least damaging one Component is practically excluded.

Die Erfindung ist selbstverständlich nicht auf das dargestellte Ausführungsbeispiel beschränkt, sondern kann verschiedentlich abgewandelt werden. So kann die erfindungsgemäße Lösung auch bei Mikrophonen mit nur einer Membran angewandt werden, es muß kein Röhrchen verwendet werden, sondern es kann, wie weiter oben erwähnt, ein anderer Bauteil hoher akustischer Impedanz verwendet werden, wobei gegebenenfalls auch eine Kombination eines solchen, beispielsweise schwammartigen Bauteils und eines kürzeren Röhrchens verwendet werden kann.The invention is of course not based on the illustrated Embodiment limited, but can be modified in various ways. So it can solution according to the invention also in microphones with only one Membrane is used, no tube has to be used but, as mentioned above, can be a other component with high acoustic impedance can be used, where appropriate also a combination of such a for example sponge-like component and one shorter tubes can be used.

Schließlich ist es auch nicht notwendig, das Ausgleichsvolumen 8 auf der Stirnseite des Mikrophons anzuordnen, es ist auch denkbar, dies auf der Seite des Sockels des Mikrophons anzuordnen, wenn es gelingt an dieser Stelle, an der ja auch die elektrischen Signalleitungen geführt werden, genügend Raum zur Verfügung zu stellen. Wenn dies gelingt, wäre eine solche Anordnung im Sockelbereich wegen der mechanisch geschützteren Lage durchaus anzustreben.After all, it is also not necessary to have the compensation volume 8 to arrange on the front of the microphone, it is also conceivable, this on the side of the base of the To arrange microphones, if you succeed at this point, on which the electrical signal lines are also routed to provide enough space. If this such an arrangement in the base area would be successful to strive for the more mechanically protected location.

Claims (7)

Klein-Mikrophon (1), das an der Kleidung oder direkt am Körper, beispielsweise im Haar, getragen wird, mit einer Stirnplatte (9) und einer Bodenplatte (2) und einem dazwischen angeordneten Mantel (3) mit zumindest einer Öffnung, die von jeweils einer Membran (3',3") abgedeckt wird, wodurch im Inneren des Mikrophons ein innerer Hohlraum (7) geschaffen wird, dadurch gekennzeichnet, daß der innere Hohlraum (7) mittels eines Bauteiles hoher akustischer Impedanz mit einem Ausgleichshohlraum (8) verbunden ist, der gegenüber der Umgebung (11) durch eine schlappe Membran (6) feuchtigkeitsdicht abgeschlossen ist.Small microphone (1) on clothing or directly on Body, for example in the hair, is worn with a End plate (9) and a base plate (2) and one in between arranged casing (3) with at least one opening, which is covered by a membrane (3 ', 3 "), whereby an internal cavity (7) inside the microphone is created, characterized in that the inner Cavity (7) by means of a component high acoustic Impedance is connected to a compensation cavity (8), the opposite of the environment (11) by a limp membrane (6) moisture-proof is complete. Mikrophon nach Anspruch 1, dadurch gekennzeichnet, daß der Bauteil hoher akustischer Impedanz ein Röhrchen (4) ist.Microphone according to claim 1, characterized in that the component with high acoustic impedance a tube (4) is. Mikrophon nach Anspruch 2, dadurch gekennzeichnet, daß das Röhrchen (4) einen Innendurchmesser von etwa 70 µm und einer Länge von 3 bis 4 mm aufweist.Microphone according to claim 2, characterized in that the tube (4) has an inner diameter of about 70 microns and has a length of 3 to 4 mm. Mikrophon nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß das Röhrchen (4) aus nicht-korrodierenden Materialien wie rostfreiem Stahl, Neusilber oder Kunststoff besteht.Microphone according to claim 2 or 3, characterized characterized in that the tube (4) made of non-corrosive Materials such as stainless steel, nickel silver or Plastic is made. Mikrophon nach Anspruch 1, dadurch gekennzeichnet, daß der Bauteil hoher akustischer Impedanz aus offenporigem Schaumstoff besteht.Microphone according to claim 1, characterized in that the component with high acoustic impedance made of open-pore There is foam. Mikrophon nach Anspruch 1, dadurch gekennzeichnet, daß die schlappe Membran (6) aus Polycarbonat, Polyurethan, Gummi oder Elastomer oder einer Metallfolie besteht. Microphone according to claim 1, characterized in that the limp membrane (6) made of polycarbonate, polyurethane, Rubber or elastomer or a metal foil. Mikrophon nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß die schlappe Membran (6) durch einen Ring (10) an der Stirnplatte (9) befestigt ist.Microphone according to one of the preceding claims, characterized in that the limp membrane (6) through a ring (10) is attached to the end plate (9).
EP00890091A 1999-03-23 2000-03-22 Small microphone Expired - Lifetime EP1039777B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT54599 1999-03-23
AT0054599A AT407322B (en) 1999-03-23 1999-03-23 SMALL MICROPHONE

Publications (3)

Publication Number Publication Date
EP1039777A2 true EP1039777A2 (en) 2000-09-27
EP1039777A3 EP1039777A3 (en) 2007-05-02
EP1039777B1 EP1039777B1 (en) 2010-11-24

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ID=3493448

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Application Number Title Priority Date Filing Date
EP00890091A Expired - Lifetime EP1039777B1 (en) 1999-03-23 2000-03-22 Small microphone

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US (1) US6351543B1 (en)
EP (1) EP1039777B1 (en)
JP (1) JP4154108B2 (en)
AT (2) AT407322B (en)
DE (1) DE50016034D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1998591B1 (en) * 2007-05-29 2018-04-04 Harris Corporation Submersible loudspeaker assembly

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Publication number Priority date Publication date Assignee Title
US7043035B2 (en) * 1999-12-09 2006-05-09 Sonionmicrotronic Nederland B.V. Miniature microphone
DE60303189T2 (en) * 2003-09-11 2006-08-24 Akg Acoustics Gmbh Dynamic electroacoustic transducer, especially small speaker
EP1694094A1 (en) * 2005-02-18 2006-08-23 AKG Acoustics GmbH Membrane for a dynamic converter
DE102012013392A1 (en) 2012-07-05 2014-01-09 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Electric horn device for a vehicle and vehicle
JP6192048B2 (en) * 2014-01-28 2017-09-06 株式会社オーディオテクニカ Capacitor headphone unit and capacitor headphone

Citations (3)

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Publication number Priority date Publication date Assignee Title
US2868894A (en) * 1955-09-14 1959-01-13 Theodore J Schultz Miniature condenser microphone
WO1997001258A1 (en) * 1995-06-23 1997-01-09 Microtronic A/S Micromechanical microphone
GB2324222A (en) * 1997-04-11 1998-10-14 Sennheiser Electronic Sweat-proof capacitor microphone

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Publication number Priority date Publication date Assignee Title
US5272758A (en) * 1991-09-09 1993-12-21 Hosiden Corporation Electret condenser microphone unit
US5673330A (en) * 1995-11-08 1997-09-30 Chang; Ching-Lu Microphone transducer with noise reducing member
JP3192100B2 (en) * 1996-11-08 2001-07-23 株式会社オーディオテクニカ Microphone
US5781644A (en) * 1997-06-20 1998-07-14 Chang; Ching-Lu Pick-up device for a microphone
JP4106119B2 (en) * 1997-12-26 2008-06-25 株式会社オーディオテクニカ Dynamic microphone

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2868894A (en) * 1955-09-14 1959-01-13 Theodore J Schultz Miniature condenser microphone
WO1997001258A1 (en) * 1995-06-23 1997-01-09 Microtronic A/S Micromechanical microphone
GB2324222A (en) * 1997-04-11 1998-10-14 Sennheiser Electronic Sweat-proof capacitor microphone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1998591B1 (en) * 2007-05-29 2018-04-04 Harris Corporation Submersible loudspeaker assembly

Also Published As

Publication number Publication date
EP1039777A3 (en) 2007-05-02
ATE489814T1 (en) 2010-12-15
JP4154108B2 (en) 2008-09-24
DE50016034D1 (en) 2011-01-05
JP2000287288A (en) 2000-10-13
US6351543B1 (en) 2002-02-26
ATA54599A (en) 2000-06-15
AT407322B (en) 2001-02-26
EP1039777B1 (en) 2010-11-24

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