US3654402A - Transducer for converting acoustic vibrations into electrical oscillations, and vice versa, in the form of a diaphragm coated with at least one layer of a piezo-electric material - Google Patents

Transducer for converting acoustic vibrations into electrical oscillations, and vice versa, in the form of a diaphragm coated with at least one layer of a piezo-electric material Download PDF

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Publication number
US3654402A
US3654402A US861028A US3654402DA US3654402A US 3654402 A US3654402 A US 3654402A US 861028 A US861028 A US 861028A US 3654402D A US3654402D A US 3654402DA US 3654402 A US3654402 A US 3654402A
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US
United States
Prior art keywords
diaphragm
transducer
damping member
layer
flat
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.)
Expired - Lifetime
Application number
US861028A
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English (en)
Inventor
Jan Roos
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US Philips Corp
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US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3654402A publication Critical patent/US3654402A/en
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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
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
    • G06V30/10—Character recognition
    • G06V30/18—Extraction of features or characteristics of the image
    • G06V30/1801—Detecting partial patterns, e.g. edges or contours, or configurations, e.g. loops, corners, strokes or intersections
    • G06V30/18067—Detecting partial patterns, e.g. edges or contours, or configurations, e.g. loops, corners, strokes or intersections by mapping characteristic values of the pattern into a parameter space, e.g. Hough transformation
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
    • G06V30/40—Document-oriented image-based pattern recognition
    • G06V30/42—Document-oriented image-based pattern recognition based on the type of document
    • G06V30/424—Postal images, e.g. labels or addresses on parcels or postal envelopes
    • 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
    • H04R7/26—Damping by means acting directly on free portion of diaphragm or cone

Definitions

  • a microphone that includes a housing in which a flexible diaphragm comprising at least one layer of piezoelectric material is secured by means of a resilient ring surrounding the periphery of the diaphragm.
  • a flat disc composed of an acoustic damping material is mounted directly on the center of the diaphragm by means of an adhesive substance.
  • the present invention relates to a microphone provided with a transducer for convening acoustic vibrations into electric oscillations in the fonn of a diaphragm coated with at least one layer of a piezo-electric material and a damping member for the vibrating plate.
  • the damping member is a magnetic member which forms part of a magnetic securing device, i.e. a magnet external to the transducer attracts the transducer inside the microphone casing and at the same time secures it.
  • the invention is characterized in that the clamping member is provided directly on the diaphragm. Compared with the known microphone this provides the advantage that the damping member is independent of the device for securing the diaphragm. Preferably the damping member is located at the area of the largest deflection of the diaphragm resulting in optimum damping thereof.
  • An embodiment of the invention is characterized in that at least part of the damping member is flat and that the member is secured throughout the area of this flat part.
  • a modification of this embodiment has a damping member which comprises a disc composed of a synthetic material having a high acoustic damping coefficient, preferably butyl rubber, which is provided flat on the diaphragm.
  • the securing may simply be effected by means of an adhesive.
  • Another modification is characterized in that the component secured to the diaphragm is provided with several lugs which extend parallel to the diaphragm.
  • damping is caused by the volume displacement of the air in the gaps between the lugs and the diaphragm. Heavier damping is obtained by shaping the lugs so that together they form a dishshaped edge. This dampping can be further increased by providing the edges with corrugations.
  • FIG. 1 is a cross-sectional view of a piezo-electric diaphragm provided with damping in accordance with the invention
  • FIG. 2 is a plan view thereof
  • FIG. 3 is a cross-sectional view of another embodiment of the invention.
  • FIGS. 4 and 5 show plan views of the embodiment of FIG. 3 provided with lug-shaped and dish-shaped damping members, respectively.
  • FIG. 1 shows part of a microphone in which a transducer 1, which comprises two piezo-electric layers 2 and 3 each provided with an electrode 4 deposited from vapor, is clamped in a fixed part of a microphone casing 6 by means of a resilient ring made of Araldite.
  • a disc of butyl rubber 10 is cemented centrally of the diaphragm 1.
  • the damping member 10 comprises a central portion 11 which is secured to the diaphragm 1 by means of an adhesive 12.
  • the damping elements of the damping member 10 are constituted by wing-shaped edge 13, which may take the form of lugs 14 (FIG. 4) or may be continuous and shaped in the form of a dish (FIG. 5).
  • the dish-shaped edge may be provided with corrugations.
  • the material used preferably is brass sheet.
  • a microphone comprising, a housing, a transducer for convetting acoustic vibrations into electric oscillations mounted within said housing, said transducer comprising a flexible diaphragm comprising at least one layer of piezoelectric material having an area of maximum deflection, and a damping member directly mounted on the diaphragm at said area of maximum deflection thereof at least a part of the damping member being flat and being secured to the diaphragm throughout said flat area, said damping member further comprising several lugs which extend from said flat part substantially parallel to and spaced apart from the diaphragm.
  • a microphone comprising,
  • a transducer for converting acoustic vibrations into electric oscillations mounted within said housing, said transducer comprising a flexible diaphragm comprising at least one layer of piezoelectric material having an area of maximum deflection, and a damping member directly mounted on the diaphragm at said area of maximum deflection thereof, at least a part of the damping member being flat and being secured to the diaphragm throughout said flat area, said damping member further comprising a peripheral portion extending from said flat part to form a dish-shaped edge that is spaced apart from the diaphragm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Artificial Intelligence (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
US861028A 1968-09-30 1969-09-25 Transducer for converting acoustic vibrations into electrical oscillations, and vice versa, in the form of a diaphragm coated with at least one layer of a piezo-electric material Expired - Lifetime US3654402A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6813996A NL6813996A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1968-09-30 1968-09-30

Publications (1)

Publication Number Publication Date
US3654402A true US3654402A (en) 1972-04-04

Family

ID=19804802

Family Applications (1)

Application Number Title Priority Date Filing Date
US861028A Expired - Lifetime US3654402A (en) 1968-09-30 1969-09-25 Transducer for converting acoustic vibrations into electrical oscillations, and vice versa, in the form of a diaphragm coated with at least one layer of a piezo-electric material

Country Status (6)

Country Link
US (1) US3654402A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AT (1) AT316669B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE1948932A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2019236A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1245030A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL6813996A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777192A (en) * 1970-10-08 1973-12-04 Dynamics Corp Massa Div A method for adjusting the resonant frequency and motional electrical impedance of a vibrating diaphragm electroacoustic transducer
US3786202A (en) * 1972-04-10 1974-01-15 Motorola Inc Acoustic transducer including piezoelectric driving element
US3937991A (en) * 1970-03-09 1976-02-10 Fred M. Dellorfano, Jr. And Donald P. Massa, Trustees Of The Stoneleigh Trust Electroacoustic transducers of the bilaminar flexural vibrating type and method for manufacturing same
US3997804A (en) * 1974-02-18 1976-12-14 Pioneer Electronic Corporation Mounting for flexible diaphragm piezoelectric transducer
EP0107843A1 (en) * 1982-10-28 1984-05-09 Masao Konomi Acceleration vibration detector
GB2180346A (en) * 1985-07-27 1987-03-25 Tapeimp Ltd Inertia sensitive device
US4949194A (en) * 1988-02-26 1990-08-14 Quest Technology Corporation Ceramic support arm for movably positioning transducers
EP0871345A1 (en) * 1997-04-03 1998-10-14 Sonitron, naamloze Vennootschap Element for reproducing and/or recording sound
BE1011559A4 (nl) * 1997-11-20 1999-10-05 Sonitron Naamloze Vennootschap Element voor het weergeven en/of opnemen van geluid.
US11297416B2 (en) * 2020-01-17 2022-04-05 Shenzhen Shokz Co., Ltd. Microphone and electronic device having the same
RU2793179C1 (ru) * 2020-01-17 2023-03-29 Шэньчжэнь Шокз Ко., Лтд. Микрофон и электронное устройство с микрофоном

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4156156A (en) * 1977-08-18 1979-05-22 P. R. Mallory & Co. Inc. Method for reducing the resonant frequency of a piezoelectric transducer
DE2831362A1 (de) * 1978-07-17 1980-01-31 Siemens Ag Elektroakustischer wandler
DE3005708C2 (de) * 1980-02-15 1984-08-30 Siemens AG, 1000 Berlin und 8000 München Wandlerplatte für piezoelektrische Wandler
FR2536622B1 (fr) * 1982-11-19 1986-03-07 Thomson Csf Hydrophone de vitesse

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2105010A (en) * 1933-02-25 1938-01-11 Brush Dev Co Piezoelectric device
US2207539A (en) * 1939-07-26 1940-07-09 Brush Dev Co Piezoelectric apparatus
US2967957A (en) * 1957-09-17 1961-01-10 Massa Frank Electroacoustic transducer
US3002179A (en) * 1952-09-03 1961-09-26 Donald W Kuester Low frequency hydrophone
US3104336A (en) * 1953-03-19 1963-09-17 Wilbur T Harris Hollow conical electromechanical transducer for use in air
US3311761A (en) * 1963-12-26 1967-03-28 Schloss Fred Transducer mounting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2105010A (en) * 1933-02-25 1938-01-11 Brush Dev Co Piezoelectric device
US2207539A (en) * 1939-07-26 1940-07-09 Brush Dev Co Piezoelectric apparatus
US3002179A (en) * 1952-09-03 1961-09-26 Donald W Kuester Low frequency hydrophone
US3104336A (en) * 1953-03-19 1963-09-17 Wilbur T Harris Hollow conical electromechanical transducer for use in air
US2967957A (en) * 1957-09-17 1961-01-10 Massa Frank Electroacoustic transducer
US3311761A (en) * 1963-12-26 1967-03-28 Schloss Fred Transducer mounting

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Harris, Handbook of Noise Control, 1957 pp. 13 21 22. *

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937991A (en) * 1970-03-09 1976-02-10 Fred M. Dellorfano, Jr. And Donald P. Massa, Trustees Of The Stoneleigh Trust Electroacoustic transducers of the bilaminar flexural vibrating type and method for manufacturing same
US3777192A (en) * 1970-10-08 1973-12-04 Dynamics Corp Massa Div A method for adjusting the resonant frequency and motional electrical impedance of a vibrating diaphragm electroacoustic transducer
US3786202A (en) * 1972-04-10 1974-01-15 Motorola Inc Acoustic transducer including piezoelectric driving element
US3997804A (en) * 1974-02-18 1976-12-14 Pioneer Electronic Corporation Mounting for flexible diaphragm piezoelectric transducer
EP0107843A1 (en) * 1982-10-28 1984-05-09 Masao Konomi Acceleration vibration detector
GB2180346A (en) * 1985-07-27 1987-03-25 Tapeimp Ltd Inertia sensitive device
EP0210816A3 (en) * 1985-07-27 1988-03-23 Tapeimp Limited Inertia sensitive device
GB2180346B (en) * 1985-07-27 1989-08-02 Tapeimp Ltd Inertia sensitive device
US4949194A (en) * 1988-02-26 1990-08-14 Quest Technology Corporation Ceramic support arm for movably positioning transducers
EP0871345A1 (en) * 1997-04-03 1998-10-14 Sonitron, naamloze Vennootschap Element for reproducing and/or recording sound
BE1011085A4 (nl) * 1997-04-03 1999-04-06 Sonitron Naamloze Vennootschap Element voor het weergeven en/of opnemen van geluid.
BE1011559A4 (nl) * 1997-11-20 1999-10-05 Sonitron Naamloze Vennootschap Element voor het weergeven en/of opnemen van geluid.
US11297416B2 (en) * 2020-01-17 2022-04-05 Shenzhen Shokz Co., Ltd. Microphone and electronic device having the same
US20220174401A1 (en) * 2020-01-17 2022-06-02 Shenzhen Shokz Co., Ltd. Microphone and electronic device having the same
RU2793179C1 (ru) * 2020-01-17 2023-03-29 Шэньчжэнь Шокз Ко., Лтд. Микрофон и электронное устройство с микрофоном
US11671746B2 (en) * 2020-01-17 2023-06-06 Shenzhen Shokz Co., Ltd. Microphone and electronic device having the same
US12015894B2 (en) 2020-01-17 2024-06-18 Shenzhen Shokz Co., Ltd. Microphone and electronic device having the same

Also Published As

Publication number Publication date
DE1948932A1 (de) 1970-04-09
FR2019236A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1970-06-26
GB1245030A (en) 1971-09-02
NL6813996A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1970-04-01
AT316669B (de) 1974-07-25

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