US2231159A - Piezoelectric device - Google Patents

Piezoelectric device Download PDF

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Publication number
US2231159A
US2231159A US176781A US17678137A US2231159A US 2231159 A US2231159 A US 2231159A US 176781 A US176781 A US 176781A US 17678137 A US17678137 A US 17678137A US 2231159 A US2231159 A US 2231159A
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United States
Prior art keywords
rubber
piezoelectric device
tensions
electric
subjected
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Expired - Lifetime
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US176781A
Inventor
Gerlach Erwin
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Telefunken AG
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Telefunken AG
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Publication date
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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
    • H04R17/02—Microphones
    • H04R17/025—Microphones using a piezoelectric polymer
    • 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
    • H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S528/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S528/931—Physical treatment of natural rubber or natural rubber containing material or chemical treatment of non-rubber portion thereof, e.g. extraction of rubber from milk weed

Definitions

  • This invention relates to a new sound device, more especially to a microphone.
  • the piezoelectric action is increased by causing the rubber solution to freeze in an electricalneld. Itis alsopossibletovulcaniaetherubesberinanelectricalfleld. 'Inerubbermassis caused to harden between plates to which evenage is applied.
  • the accompanylni flaure illustrates a microphone as example embodyins the idea of the in vention.
  • the microphone body I exposed to I acoustic oscillations consists of rubber, the voltare produced being derived by means of the electrodes 2.
  • a thin metal layer 3 is preferably applied to the rubber piece and a thin metal foil is to be placed between the electrodes and the rubber piece.
  • the method of producinz an element which 15 when subjected to mechanical stresses will provide electrical tensions and vice versa which includes the steps of, freezing a rubber solution to obtain solid rubber, and subjectin: said solution to an electrical ileld durina said freeains process to to so orient therubbermolecules astoenhancethe ability of said element to provide electrical tension when subjected to mechanical stresses and vice versa.

Description

Feb. 11, 1941. E. GERLACH I 2,231,159
PIEZOELEC'TRIC DEVICE Filed Nov. 2'7, 1937 INVENTOR [kW/N Gil/16H BY W ATTORNEY Patented Feb. 11, 1941 UNITED STATES.
2,231,159 rmzomnc'mlc nsvlca Application November 21. 1m, Serial No. 176,781
In Germany December 12, 1938 1 Claim. (Cl. 111-321) This invention relates to a new sound device, more especially to a microphone. A
As is known, certain crystals reveal a piezoelectriceflect, i. e. electric tensions are produced a when they are subjected to a compression or tension and, vice versa, deformations of the crystal occur when applying thereto electric tensions.
Now, it was found that also rubber placed between two electrodes produces considerable electric ten- 10 sions, if mechanical oscillations such as, for instance, acoustic oscillations act upon the rubber piece such that the oscillations produce tension stresses or compression stresses in the rubber piece. The electric tensions evidently are caused I l by effects that are similar to the piezoelectric actions of the crystals so that presumably a certain orientation of the rubber molecules takes place durins the manufacturing process of the rubber, for instance. at the rolling of the. plate 20 from natural rubber.
In accordance with a further feature of the invention, the piezoelectric action is increased by causing the rubber solution to freeze in an electricalneld. Itisalsopossibletovulcaniaetherubesberinanelectricalfleld. 'Inerubbermassis caused to harden between plates to which evenage is applied.
The accompanylni flaure illustrates a microphone as example embodyins the idea of the in vention. The microphone body I exposed to I acoustic oscillations consists of rubber, the voltare produced being derived by means of the electrodes 2. In order to assure apossibly favorable picking up of this voltage, a thin metal layer 3 is preferably applied to the rubber piece and a thin metal foil is to be placed between the electrodes and the rubber piece.
What is claimed is:
The method of producinz an element which 15 when subjected to mechanical stresses will provide electrical tensions and vice versa which includes the steps of, freezing a rubber solution to obtain solid rubber, and subiectin: said solution to an electrical ileld durina said freeains process to to so orient therubbermolecules astoenhancethe ability of said element to provide electrical tension when subjected to mechanical stresses and vice versa. I
g ER.WIN GERLACH.
US176781A 1936-12-12 1937-11-27 Piezoelectric device Expired - Lifetime US2231159A (en)

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DE2231159X 1936-12-12

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2796467A (en) * 1951-12-12 1957-06-18 Bell Telephone Labor Inc Directional transducer
US3801839A (en) * 1971-12-03 1974-04-02 Rion Co Mechanical to electrical transducer device
JPS4984798A (en) * 1972-12-22 1974-08-14
US4378721A (en) * 1978-07-20 1983-04-05 Kabushiki Kaisha Kawai Seisakusho Pickup apparatus for an electric string type instrument
US20020080984A1 (en) * 2000-07-13 2002-06-27 Amercian Technology Corporation Electrostatic loudspeaker with a distributed filter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2796467A (en) * 1951-12-12 1957-06-18 Bell Telephone Labor Inc Directional transducer
US3801839A (en) * 1971-12-03 1974-04-02 Rion Co Mechanical to electrical transducer device
JPS4984798A (en) * 1972-12-22 1974-08-14
JPS5326799B2 (en) * 1972-12-22 1978-08-04
US4378721A (en) * 1978-07-20 1983-04-05 Kabushiki Kaisha Kawai Seisakusho Pickup apparatus for an electric string type instrument
US20020080984A1 (en) * 2000-07-13 2002-06-27 Amercian Technology Corporation Electrostatic loudspeaker with a distributed filter
US6760455B2 (en) * 2000-07-13 2004-07-06 American Technology Corporation Electrostatic loudspeaker with a distributed filter

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