US3798392A - Electroacoustic transducer - Google Patents

Electroacoustic transducer Download PDF

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Publication number
US3798392A
US3798392A US00245105A US3798392DA US3798392A US 3798392 A US3798392 A US 3798392A US 00245105 A US00245105 A US 00245105A US 3798392D A US3798392D A US 3798392DA US 3798392 A US3798392 A US 3798392A
Authority
US
United States
Prior art keywords
disc
shaped member
diaphragm
electroacoustic transducer
storage structure
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
US00245105A
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English (en)
Inventor
E Martin
F Beil
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens Corp
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 Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3798392A publication Critical patent/US3798392A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for microphones
    • 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
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery

Definitions

  • the invention described herein relates to an electroacoustic transducer of the type having a diaphragm strained to curvature.
  • the diaphragm is gripped at its edge regions with a single or multiple storage structure of elastic material.
  • the diaphragm contains in the transmission frequency band of the transducer, along with the resonant peak corresponding to the basic oscillation of the diaphragm, at least one resonant peak corresponding to a subharmonic oscillation of the diaphragm with an oscillation nodal line in the free portion of the diaphragm, in particular that one corresponding to the first subharmonic oscillation.
  • Transducers of this type are generally used in telephones.
  • An object of the invention is to provide a means for correcting the oscillation condition of the diaphragm within the framework of the above mentioned frequency band in a simple manner, i.e., to adjust it such that a specific condition corresponding to the respective requirements is achieved.
  • the storage structure serving to fasten and grip the diaphragm adjoins an annular surface on at least one side of the diaphragm.
  • the inside diameter of the annular surface is larger than the inside diameter of the storage structure.
  • the fastening of the diaphragm can be influenced such that the frequency band of the transducer exhibits the desired characteristics.
  • the fastening relationships can be regulated by the choice of the inside diameter of the support surface, such that with unchanged storage structure and unchanged diaphragm, very different oscillation conditions of the diaphragm can be set up. This yields the possibility of obtaining different oscillation conditions through possible corrections of the frequency of operation, which are adapted to the application at hand.
  • the annular surface can be formed by a replaceable body placed in the transducer housing.
  • the transducer prefferably to form the annular surface from a flange-like extension of a body which is essentially disc-shaped and placed'parallel to the diaphragm. Such an arrangement permits further adjustment of the oscillation condition to be achieved in a simplemanner.
  • the disc-shaped body can also contain at least one cavity, which is connected with the rear space of the diaphragm over at least one opening, whereby a Helmholtz resonator is formed.
  • FIG. 1 is a side sectional view of a piezo-electric microphone in which the storage structure for the diaphragm adjoins an annular surface, in accordance with the invention.
  • FIGS. 2 and 3 are side sectional views of two different variations of disc-shaped bodies, whose annular support surfaces are formed by a ring shaped flangelike extension of a disc.
  • the piezo-electric microphone shown in FIG. 1 has as its active element a diaphragm 2 provided with piezo-ceramic layer 1, which is held in a ring shaped elastic storage structure 3 of silicon rubber. Together with another ring 4 surrounding this storage structure 3, the components 3 and 4 adjoin a disc-shaped body 6 provided with a flange-like extension 5, which body has formed therein two openings 7 and 8.
  • the disc 6 provided with flange-like extension 5 is made of insulating material.
  • the flange-like member 5 forms an annular surface on which the elements 3 and 4 can rest.
  • the arrangement shown thus is surrounded by a covering 9 and a housing 10, which extends into an insulating body 11 at its lower end. The insulating body 11 is penetrated by a center contact.
  • the electrical connections have not been included in the drawing for the sake of clarity, but conventional electrical connections are used.
  • An essential characteristic of the invention is that the inside diameter pl'of the elastic storage structure is always smaller than the inside diameter p2 of the flangelike, annular extension 5 of the disc 6.
  • the oscillation condition of the diaphragm can be influenced in substantial measure, so that one can adjust the frequency of operation of the transducer, according to the requirements. Such adjustment can be made simply by inserting another body 6 having an extension 5 of different inner diameter.
  • F IG. 2 shows another version of a disc 13 with flan gelike extension 14, which has an inside diameter'p2.
  • a cavity 15 is formed in the disc body, and this cavity is connected with the diaphragm rear space over an opening 16, so that a Helmholtz resonator is formed.
  • a cavity 18 is placed in the disc 17 of FIG. 3, which here is connected withthe space surrounding it by two openings 19 and 20 through the opposite surfaces of the disc.
  • an electroacoustic transducer structure having a diaphragm stressed by bending and gripped at its edge portions by agenerally ring-shaped storage structure constructed from elastic material, said diaphragm having a resonant peak at the desired frequency of operation of the transducerand at least one resonantpeak corresponding to a subharmonic of the frequency of operation with an isoillation nodal line in the free portion of the diaphragm, the improvement comprising:
  • said annular surface having an inner diameter greater than the inner diameter of said storage structure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Multimedia (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
US00245105A 1971-04-23 1972-04-18 Electroacoustic transducer Expired - Lifetime US3798392A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2119911A DE2119911B2 (de) 1971-04-23 1971-04-23 Elektroakustischer Wandler, insbe sondere Mikrofon fur Fernsprechanlagen

Publications (1)

Publication Number Publication Date
US3798392A true US3798392A (en) 1974-03-19

Family

ID=5805699

Family Applications (1)

Application Number Title Priority Date Filing Date
US00245105A Expired - Lifetime US3798392A (en) 1971-04-23 1972-04-18 Electroacoustic transducer

Country Status (10)

Country Link
US (1) US3798392A (enrdf_load_stackoverflow)
BE (1) BE782498R (enrdf_load_stackoverflow)
BG (1) BG20417A4 (enrdf_load_stackoverflow)
DE (1) DE2119911B2 (enrdf_load_stackoverflow)
FR (1) FR2134023B2 (enrdf_load_stackoverflow)
GB (1) GB1350023A (enrdf_load_stackoverflow)
IT (1) IT1018506B (enrdf_load_stackoverflow)
LU (1) LU65209A1 (enrdf_load_stackoverflow)
SE (1) SE367752B (enrdf_load_stackoverflow)
ZA (1) ZA722575B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005278A (en) * 1974-09-16 1977-01-25 Akg Akustische U. Kino-Gerate Gesellschaft M.B.H. Headphone
EP0025955A1 (de) * 1979-09-19 1981-04-01 Siemens Aktiengesellschaft Piezoelektrischer Tonrufwandler
CN104718768A (zh) * 2012-10-15 2015-06-17 Nec卡西欧移动通信株式会社 电声换能器及其制造方法和使用电声换能器的电子设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4337640A (en) 1979-04-10 1982-07-06 Nissan Motor Co., Ltd. Knocking sensor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1757938A (en) * 1925-04-13 1930-05-06 Harvey C Hayes Acoustic instrument
US2921993A (en) * 1955-10-04 1960-01-19 Electro Voice Pressure gradient noise canceling microphone
US3206558A (en) * 1961-09-22 1965-09-14 Erie Technological Prod Inc Microphone
DE1226647B (de) * 1965-03-22 1966-10-13 Siemens Ag Elektroakustischer Wandler
DE1961217A1 (de) * 1969-12-05 1971-06-16 Siemens Ag Elektroakustischer Wandler,insbesondere Mikrofon fuer Fernsprechanlagen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE88657C (enrdf_load_stackoverflow) *
FR1084139A (fr) * 1952-10-06 1955-01-17 Microphone à condensateur pour réception directionnelle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1757938A (en) * 1925-04-13 1930-05-06 Harvey C Hayes Acoustic instrument
US2921993A (en) * 1955-10-04 1960-01-19 Electro Voice Pressure gradient noise canceling microphone
US3206558A (en) * 1961-09-22 1965-09-14 Erie Technological Prod Inc Microphone
DE1226647B (de) * 1965-03-22 1966-10-13 Siemens Ag Elektroakustischer Wandler
DE1961217A1 (de) * 1969-12-05 1971-06-16 Siemens Ag Elektroakustischer Wandler,insbesondere Mikrofon fuer Fernsprechanlagen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005278A (en) * 1974-09-16 1977-01-25 Akg Akustische U. Kino-Gerate Gesellschaft M.B.H. Headphone
EP0025955A1 (de) * 1979-09-19 1981-04-01 Siemens Aktiengesellschaft Piezoelektrischer Tonrufwandler
CN104718768A (zh) * 2012-10-15 2015-06-17 Nec卡西欧移动通信株式会社 电声换能器及其制造方法和使用电声换能器的电子设备
EP2908552A4 (en) * 2012-10-15 2016-06-08 Nec Corp ELECTRIC ACOUSTIC CONVERTER, MANUFACTURING METHOD AND ELECTRONIC DEVICE THEREFOR
CN104718768B (zh) * 2012-10-15 2017-08-25 日本电气株式会社 电声换能器及其制造方法和使用电声换能器的电子设备

Also Published As

Publication number Publication date
LU65209A1 (enrdf_load_stackoverflow) 1972-07-13
IT1018506B (it) 1977-10-20
DE2119911A1 (de) 1972-11-02
ZA722575B (en) 1973-01-31
FR2134023B2 (enrdf_load_stackoverflow) 1978-03-03
BG20417A4 (bg) 1975-11-05
FR2134023A2 (enrdf_load_stackoverflow) 1972-12-01
DE2119911B2 (de) 1973-11-15
GB1350023A (en) 1974-04-18
SE367752B (enrdf_load_stackoverflow) 1974-06-04
BE782498R (fr) 1972-10-23

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