EP1189482A1 - Membran eines optischen Mikrophons bzw. Sensors - Google Patents

Membran eines optischen Mikrophons bzw. Sensors Download PDF

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Publication number
EP1189482A1
EP1189482A1 EP01302813A EP01302813A EP1189482A1 EP 1189482 A1 EP1189482 A1 EP 1189482A1 EP 01302813 A EP01302813 A EP 01302813A EP 01302813 A EP01302813 A EP 01302813A EP 1189482 A1 EP1189482 A1 EP 1189482A1
Authority
EP
European Patent Office
Prior art keywords
membrane
film
ripples
sensor
optical microphone
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Withdrawn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
EP01302813A
Other languages
English (en)
French (fr)
Inventor
Alexander Paritsky
Alexander 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
Publication of EP1189482A1 publication Critical patent/EP1189482A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed

Definitions

  • the present invention relates to microphones and sensors, and more particularly, to membranes for optical microphone/sensors.
  • Optical microphone/sensors of the type according to the present invention consist of a source of light transmitted through a light guide for illuminating a membrane moving under acoustic pressure or otherwise, the membrane reflecting light impinging thereon into a light guide leading to a photo detector for transforming the reflected light energy into electrical signals.
  • the membrane is one of the main elements of the microphone/sensor. It constitutes an interface between the two different media of acoustics and light. It makes a connection between sound and light, and the better this connection is, the better are the results, and the better and more reliable is the microphone/sensor over a wide range of environmental conditions.
  • Another way to produce a membrane which is reliable at different conditions of temperature is to use a membrane having a specific regulating spring, usually at its periphery.
  • the spring compensates for all changes in the membrane's size and tension resulting from changes in temperature. This method is used in dynamic microphones, in load speakers, and recently also in silicon microphones.
  • the invention therefore provides a membrane for an optical microphone/sensor, comprising a film of a selected thickness, having crinkles forming ripples on at least one of its surfaces, the depths and pitches of said ripples being in the order of the thickness of said film.
  • Fig. 1 a cross-section of the membrane 2 as mounted on a ring 4.
  • the membrane is made of a metal, e.g., aluminum, nickel or titanium, film stretched over and attached to the ring 4 made of the same metallic material.
  • the thickness T of the film may be from 0.1-10 ⁇ , or even less.
  • Fig. 2 illustrates an enlarged portion of membrane 2 in cross-section
  • Fig. 3 shows a magnified, microsopic photograph of the surface of such a membrane.
  • the surface of membrane 2 is crinkled, having random ripples 6.
  • the depths D and pitches P of the ripples 6 are in the order of the range of membrane thickness T .
  • the crinkled surface of the membrane functions as a two-dimensional, random spring, and easily compensates for temperature-affected changes in membrane size. At the same time, the production of the membrane is simple and of low cost.
  • the sizes of the ripples, their depth and their pitch have to be in the same order of range as the membrane thickness T .
  • the size of the random ripples has to be smaller than the light spot impinging on the membrane, so as to prevent the undesirable modulation of the intensity of the light reflected by the random ripples of the membrane surface.
  • the ripple size of 0.1-10 ⁇ will neither essentially change nor modulate the intensity of the reflected light.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
EP01302813A 2000-09-14 2001-03-27 Membran eines optischen Mikrophons bzw. Sensors Withdrawn EP1189482A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL13845900A IL138459A0 (en) 2000-09-14 2000-09-14 Membranes for optical microphone/sensors
IL13845900 2000-09-14

Publications (1)

Publication Number Publication Date
EP1189482A1 true EP1189482A1 (de) 2002-03-20

Family

ID=11074628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01302813A Withdrawn EP1189482A1 (de) 2000-09-14 2001-03-27 Membran eines optischen Mikrophons bzw. Sensors

Country Status (3)

Country Link
EP (1) EP1189482A1 (de)
JP (1) JP2002159095A (de)
IL (1) IL138459A0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1668955A2 (de) * 2003-09-08 2006-06-14 John M. Norton Audio lautsprecher
US10356533B2 (en) 2015-04-09 2019-07-16 Sintef Tto As Speech recognition

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3953752B2 (ja) * 2001-06-19 2007-08-08 株式会社ケンウッド 光音響変換装置の振動板構造

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB749551A (en) * 1953-11-18 1956-05-30 Eric Lionel Hutchings Improvements in or relating to expansible devices having at least one diaphragm-like member
US3247927A (en) * 1960-07-29 1966-04-26 Int Standard Electric Corp Electro-acoustic transducers
JPS55162700A (en) * 1979-06-05 1980-12-18 Matsushita Electric Ind Co Ltd Optical microphone
GB2086586A (en) * 1980-10-27 1982-05-12 Setra Systems Inc Diaphragms for transducers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB749551A (en) * 1953-11-18 1956-05-30 Eric Lionel Hutchings Improvements in or relating to expansible devices having at least one diaphragm-like member
US3247927A (en) * 1960-07-29 1966-04-26 Int Standard Electric Corp Electro-acoustic transducers
JPS55162700A (en) * 1979-06-05 1980-12-18 Matsushita Electric Ind Co Ltd Optical microphone
GB2086586A (en) * 1980-10-27 1982-05-12 Setra Systems Inc Diaphragms for transducers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 040 (E - 049) 17 March 1981 (1981-03-17) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1668955A2 (de) * 2003-09-08 2006-06-14 John M. Norton Audio lautsprecher
EP1668955A4 (de) * 2003-09-08 2007-10-31 John M Norton Audio lautsprecher
US10356533B2 (en) 2015-04-09 2019-07-16 Sintef Tto As Speech recognition

Also Published As

Publication number Publication date
JP2002159095A (ja) 2002-05-31
IL138459A0 (en) 2001-10-31

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