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1. EP2239961 - Backplate for microphone

Office
European Patent Office
Application Number 09157442
Application Date 06.04.2009
Publication Number 2239961
Publication Date 13.10.2010
Publication Kind A1
IPC
H04R 19/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
19Electrostatic transducers
B81C 1/00
BPERFORMING OPERATIONS; TRANSPORTING
81MICROSTRUCTURAL TECHNOLOGY
CPROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
1Manufacture or treatment of devices or systems in or on a substrate
H04R 31/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
31Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
CPC
H04R 19/005
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
19Electrostatic transducers
005using semiconductor materials
H04R 31/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
31Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
H04R 2499/11
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
2499Aspects covered by H04R or H04S not otherwise provided for in their subgroups
10General applications
11Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
Y10T 29/49005
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
29Metal working
49Method of mechanical manufacture
49002Electrical device making
49005Acoustic transducer
Y10T 29/49575
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
29Metal working
49Method of mechanical manufacture
4957Sound device making
49575including diaphragm or support therefor
Applicants NXP BV
Inventors VAN DER AVOORT CAS
JANSMAN ANDREAS BERNARDUS MARIA
LANGEREIS GEERT
VAN LIPPEN TWAN
SUY HILCO
Designated States
Priority Data 09157442 06.04.2009 EP
Title
(DE) Rückplatte für ein Mikrofon
(EN) Backplate for microphone
(FR) Plaque arrière pour microphone
Abstract
(EN) A microphone has a membrane (20) mounted to vibrate in response to pressure fluctuations, a backplate (30) facing the membrane and being more rigid than the membrane, and circuitry (95) for sensing the vibrations relative to the backplate, the backplate being prestressed and having a geometry such that a response of the backplate to structure borne vibration matches a corresponding response of the membrane. This can help reduce or minimize relative movement between these surfaces caused by structure borne vibration and hence improve the signal-to-noise ratio of the microphone. The geometry can be a hub and spoke arrangement.
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