Optical microphone has a mirror surface only partially over the membrane to reduce the membrane mass for increased sensitivity and pliability without loss of recording quality

The optical microphone has a transmitting lightwave conductor (1) coupled to a light source (14). An opto-electrical converter (19) is coupled to the receiver lightwave conductor (2). The light waves are reflected from a membrane (3) with a mirror surface (3a). The mass of the membrane (3) is reduce...

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Bibliographic Details
Main Authors HIBBING, MANFRED, GORELIK, VLADIMIR, NIEHOFF, WOLFGANG
Format Patent
LanguageEnglish
German
Published 17.02.2000
Edition7
Subjects
DEAF-AID SETS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS
PUBLIC ADDRESS SYSTEMS
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Summary:The optical microphone has a transmitting lightwave conductor (1) coupled to a light source (14). An opto-electrical converter (19) is coupled to the receiver lightwave conductor (2). The light waves are reflected from a membrane (3) with a mirror surface (3a). The mass of the membrane (3) is reduced by locating the mirror surface (3a) only partially where the light strikes the membrane, to increase the membrane pliability and sensitivity at the same threshold frequency. Die Erfindung betrifft ein optisches Mikrofon mit einem an eine Lichtquelle (14) gekoppelten Sende-Lichtwellenleiter (1), einem an einen optoelektrischen Wandler (19) gekoppelten Empfangs-Lichtwellenleiter (2) und mindestens einer Membran (3) mit einer Spiegelfläche (3a). Um bei gleicher Grenzfrequenz die Nachgiebigkeit der Membran und damit die Empfindlichkeit vergrößern zu können, wird die Masse der Membran (3) dadurch verringert, daß sie nur partiell im Auftreffbereich des Lichts mit einer Spiegelfläche (3a) versehen ist.
Bibliography:Application Number: DE1998135947