EP1246502A1 - Microphone - Google Patents

Microphone Download PDF

Info

Publication number
EP1246502A1
EP1246502A1 EP01303026A EP01303026A EP1246502A1 EP 1246502 A1 EP1246502 A1 EP 1246502A1 EP 01303026 A EP01303026 A EP 01303026A EP 01303026 A EP01303026 A EP 01303026A EP 1246502 A1 EP1246502 A1 EP 1246502A1
Authority
EP
European Patent Office
Prior art keywords
membrane
microphone
aluminum
membrane frame
modulus
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.)
Withdrawn
Application number
EP01303026A
Other languages
German (de)
French (fr)
Inventor
Masahiko c/o Nippon Ceramic Co. Ltd. Moriguchi
Tetsuro c/o Nippon Ceramic Co. Ltd. Inoue
Alexander c/o Phone-Or Ltd. Paritsky
Alexander c/o Phone Or Ltd. Kots
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Phone Or Ltd
Original Assignee
Phone Or Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Phone Or Ltd filed Critical Phone Or Ltd
Priority to EP01303026A priority Critical patent/EP1246502A1/en
Publication of EP1246502A1 publication Critical patent/EP1246502A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/008—Transducers other than those covered by groups H04R9/00 - H04R21/00 using optical signals for detecting or generating sound

Definitions

  • the present invention relates to a microphone to be used as a small microphone in car phones and cellular phones, and for detecting intruders by utilizing the pressure change caused by an intruder.
  • an aluminum membrane is used as the vibrating body of a microphone.
  • This membrane is affixed to a membrane frame, which is provided with a ring-shaped or square hole, with an adhesive.
  • the membrane is caused to vibrate by external sound, pressure change, etc., and this vibration is detected electrically or optically.
  • Japanese Patent Application No. 10-107427 is an example of a microphone that optically detects vibrations.
  • the membrane frame is made of aluminum, which is also used as the material for the membrane. Space between the membrane and vibration detector is set to approximately 25 micrometers in order to reduce air resistance. Further, an air escape is provided to the air detector in order to increase the membrane vibration amplitude. The air escape is positioned from the inner circle of the membrane frame to the inside of the microphone.
  • the aforementioned Japanese Patent Application No. 10-107427 has a problem that the microphone output would change due to change in ambient temperature or in humidity, or heat. Stress is inflicted on the membrane frame when the detector expands or contracts due to the change in ambient temperature or in humidity. The inflicted stress is not even, but rather distributed, due to the existence of the air escape. Similarly, the heat generated during the soldering process upon manufacturing microphones will not transmit evenly to the membrane frame due to the air escape, resulting in heat distribution. Such stress distribution and heat distribution will generate distortion in the membrane frame, and generate a slack or tension in the membrane, and the output of a microphone will vary.
  • a material having a larger Young's modulus and a smaller thermal expansion coefficient than those of aluminum is used as the material for the membrane frame.
  • the amount of distortion to the membrane frame will be small even if there is stress distribution or heat distribution in the membrane frame. As a result, the slack or tension in the membrane will also be reduced.
  • the slack or tension on the membrane caused by change in ambient temperature or in humidity, or heat can be reduced, thereby stabilizing the microphone output.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

Provided is a microphone with a stable output employing an aluminum membrane and having an air escape provided to the vibration detector. Specifically, the material used as the membrane frame material has a larger Young's modulus and a smaller thermal expansion coefficient than those of aluminum. Thereby, even if stress distribution or heat distribution is inflicted on the membrane frame, the slack or tension in the membrane will be reduced and the microphone output is stabilized.

Description

    BACKGROUND OF THE INVENTION 1. Field of the Invention
  • The present invention relates to a microphone to be used as a small microphone in car phones and cellular phones, and for detecting intruders by utilizing the pressure change caused by an intruder.
    • 2. Description of the Related Art
  • Typically, an aluminum membrane is used as the vibrating body of a microphone. This membrane is affixed to a membrane frame, which is provided with a ring-shaped or square hole, with an adhesive. The membrane is caused to vibrate by external sound, pressure change, etc., and this vibration is detected electrically or optically. Japanese Patent Application No. 10-107427 is an example of a microphone that optically detects vibrations. The membrane frame is made of aluminum, which is also used as the material for the membrane. Space between the membrane and vibration detector is set to approximately 25 micrometers in order to reduce air resistance. Further, an air escape is provided to the air detector in order to increase the membrane vibration amplitude. The air escape is positioned from the inner circle of the membrane frame to the inside of the microphone.
  • The aforementioned Japanese Patent Application No. 10-107427 has a problem that the microphone output would change due to change in ambient temperature or in humidity, or heat. Stress is inflicted on the membrane frame when the detector expands or contracts due to the change in ambient temperature or in humidity. The inflicted stress is not even, but rather distributed, due to the existence of the air escape. Similarly, the heat generated during the soldering process upon manufacturing microphones will not transmit evenly to the membrane frame due to the air escape, resulting in heat distribution. Such stress distribution and heat distribution will generate distortion in the membrane frame, and generate a slack or tension in the membrane, and the output of a microphone will vary.
    • SUMMARY OF THE INVENTION
  • According to the present invention, a material having a larger Young's modulus and a smaller thermal expansion coefficient than those of aluminum is used as the material for the membrane frame.
    • DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • By using a material having a larger Young's modulus and a smaller thermal expansion coefficient than those of aluminum as the material for the membrane frame, the amount of distortion to the membrane frame will be small even if there is stress distribution or heat distribution in the membrane frame. As a result, the slack or tension in the membrane will also be reduced.
  • Steel has a Young's modulus of 20×1010 Pa and a thermal expansion coefficient of 11×10-6 /°C, whereas aluminum has a Young's modulus of 7×1010 Pa and a thermal expansion coefficient of 23×10-6 /°C. Thereby, if stress distribution or heat distribution is inflicted on the membrane frame, the amount of distortion is small when steel is used. The above is just one example, and other materials may be used so far as such materials satisfy the conditions of having a larger Young's modulus and a smaller thermal expansion coefficient than those of aluminum in order to decrease the amount of distortion and reduce the slack or tension caused to the membrane.
  • According to the present invention, the slack or tension on the membrane caused by change in ambient temperature or in humidity, or heat can be reduced, thereby stabilizing the microphone output.

Claims (1)

  1. A microphone employing an aluminum membrane and having an air escape provided to a vibration detector, wherein the material used as the membrane frame has a larger Young's modulus and a smaller thermal expansion coefficient than those of aluminum.
EP01303026A 2001-03-30 2001-03-30 Microphone Withdrawn EP1246502A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01303026A EP1246502A1 (en) 2001-03-30 2001-03-30 Microphone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01303026A EP1246502A1 (en) 2001-03-30 2001-03-30 Microphone

Publications (1)

Publication Number Publication Date
EP1246502A1 true EP1246502A1 (en) 2002-10-02

Family

ID=8181852

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01303026A Withdrawn EP1246502A1 (en) 2001-03-30 2001-03-30 Microphone

Country Status (1)

Country Link
EP (1) EP1246502A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI505723B (en) * 2009-12-29 2015-10-21 Bse Co Ltd Mems microphone and manufacturing method of the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5717300A (en) * 1980-07-04 1982-01-28 Victor Co Of Japan Ltd Diaphragm plate for dynamic type electro-acoustic converter
JPS59138198A (en) * 1983-01-26 1984-08-08 Murata Mfg Co Ltd Highly elastic diaphragm for speaker
US4926696A (en) * 1986-11-19 1990-05-22 Massachusetts Institute Of Technology Optical micropressure transducer
US5854846A (en) * 1996-09-06 1998-12-29 Northrop Grumman Corporation Wafer fabricated electroacoustic transducer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5717300A (en) * 1980-07-04 1982-01-28 Victor Co Of Japan Ltd Diaphragm plate for dynamic type electro-acoustic converter
JPS59138198A (en) * 1983-01-26 1984-08-08 Murata Mfg Co Ltd Highly elastic diaphragm for speaker
US4926696A (en) * 1986-11-19 1990-05-22 Massachusetts Institute Of Technology Optical micropressure transducer
US5854846A (en) * 1996-09-06 1998-12-29 Northrop Grumman Corporation Wafer fabricated electroacoustic transducer

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 081 (E - 107) 19 May 1982 (1982-05-19) *
PATENT ABSTRACTS OF JAPAN vol. 008, no. 268 (E - 283) 7 December 1984 (1984-12-07) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI505723B (en) * 2009-12-29 2015-10-21 Bse Co Ltd Mems microphone and manufacturing method of the same

Similar Documents

Publication Publication Date Title
CN211930820U (en) Vibration sensor and audio device
US20110272769A1 (en) Mems microphone package and packaging method
US9247331B2 (en) Temperature compensated microphone
CN108513241A (en) Vibrating sensor and audio frequency apparatus
WO2010013603A1 (en) Microphone unit and cellular phone provided with same
JP2008532371A (en) MEMS microphone
US5570428A (en) Transducer assembly
WO2022089299A1 (en) Bone voiceprint sensor module and electronic device
CN113709643B (en) Vibration pickup unit, bone voiceprint sensor and electronic equipment
CN111147992A (en) A dustproof construction and MEMS microphone packaging structure for MEMS device
KR101871578B1 (en) nonflammables speaker of piezoelectricity type
CN112565995A (en) Sensor chip, bone voiceprint sensor and electronic device
US8340341B2 (en) Coated speaker dome
US8229142B2 (en) Devices and systems including transducers
US20020051553A1 (en) Microphone
CN108696812B (en) Optical fiber grating microphone
EP1246502A1 (en) Microphone
US9674605B2 (en) Loudspeaker with pressure compensation element
US11743656B2 (en) Multi-stage structure-borne sound and vibration sensor
JP3690937B2 (en) Piezoelectric speaker
EP4095496A1 (en) Structure-borne sound and vibration sensor
KR100737728B1 (en) Packaging structure of mems microphone and construction method thereof
JPS6315125A (en) Acceleration sensor
US6016704A (en) Electromechanic transducer with integrated pressure sensor
CN107211219A (en) Non-ignitable piezoelectric speaker

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

RIN1 Information on inventor provided before grant (corrected)

Inventor name: INOUE, TETSURO, C/O NIPPON CERAMIC CO. LTD.

Inventor name: KOTS, ALEXANDER, C/O PHONE OR LTD.

Inventor name: PARITSKY, ALEXANDER, C/O PHONE-OR LTD.

Inventor name: MORIGUCHI, MASAHIKO, C/O NIPPON CERAMIC CO. LTD.

AKX Designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20030403