EP0007036A1 - Transducteur électroacoustique - Google Patents

Transducteur électroacoustique Download PDF

Info

Publication number
EP0007036A1
EP0007036A1 EP79102142A EP79102142A EP0007036A1 EP 0007036 A1 EP0007036 A1 EP 0007036A1 EP 79102142 A EP79102142 A EP 79102142A EP 79102142 A EP79102142 A EP 79102142A EP 0007036 A1 EP0007036 A1 EP 0007036A1
Authority
EP
European Patent Office
Prior art keywords
transducer
plate
converter
oscillation
sensitivity
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Withdrawn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
EP79102142A
Other languages
German (de)
English (en)
Inventor
Konrad Dr. Walliser
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
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Publication of EP0007036A1 publication Critical patent/EP0007036A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Definitions

  • the invention relates to an electroacoustic transducer with a transducer plate, which is clamped at its edge area with the aid of bearing bodies and is provided with a piezoelectric layer.
  • transducers In the frequency response of transducers, in particular transducers with a piezoelectric layer provided transducer plate, undesirable increases in sensitivity mostly occur due to harmonics of the transducer membrane used. This applies in particular to the fourth-order partial oscillation, which is characterized by a circle of nodes within the oscillating surface.
  • the transducer element is tuned so that the basic resonance is within the transmission range of 200-4000 Hz.
  • the greatest increase in sensitivity in the basic resonance can then be easiest reduced by a damped absorption resonator coupled to the transducer element.
  • higher-order partial vibrations also fall within the transmission range.
  • the second and third partial oscillations which would normally lead to drops in the frequency response, are largely avoided by the converter being constructed as symmetrically as possible.
  • the fourth partial oscillation an undesirable increase occurs in the frequency response, whereby the danger of whistling when installing such transducers in a handset of a telephone is undesirably increased.
  • the converter plate is reinforced from 230 ⁇ m to 290 ⁇ m.
  • the resonance frequency of the fourth partial vibration is shifted from 4.1 kHz to 5.2 kHz.
  • the frequency of the basic resonance is thus somewhat higher, namely at 1400 Hz instead of 1200 Hz. This shift in the increase can be easily corrected by a slight change in the coupling in the sound field.
  • the converter plate is covered with a plastic layer. This dampens the fourth partial vibration in particular.
  • a layer of 50 .mu.m causes the increase in the fourth partial oscillation to be reduced by approximately 3 dB.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
EP79102142A 1978-07-17 1979-06-27 Transducteur électroacoustique Withdrawn EP0007036A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19782831362 DE2831362A1 (de) 1978-07-17 1978-07-17 Elektroakustischer wandler
DE2831362 1978-07-17

Publications (1)

Publication Number Publication Date
EP0007036A1 true EP0007036A1 (fr) 1980-01-23

Family

ID=6044593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79102142A Withdrawn EP0007036A1 (fr) 1978-07-17 1979-06-27 Transducteur électroacoustique

Country Status (8)

Country Link
EP (1) EP0007036A1 (fr)
JP (1) JPS5516594A (fr)
AR (1) AR228018A1 (fr)
AU (1) AU4893079A (fr)
BR (1) BR7904528A (fr)
DE (1) DE2831362A1 (fr)
GB (1) GB2025732A (fr)
ZA (1) ZA793578B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0034730A1 (fr) * 1980-02-15 1981-09-02 Siemens Aktiengesellschaft Plaque de transducteur pour transducteurs piézo-électriques

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS582322A (ja) * 1981-06-30 1983-01-07 Nitto Electric Ind Co Ltd 半導体封止用エポキシ樹脂組成物

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1299724B (de) * 1966-10-21 1969-07-24 Siemens Ag Mikrophonkapsel mit einem piezoelektrischen Wandlerelement und einem Transistorverstaerker
DE1948932A1 (de) * 1968-09-30 1970-04-09 Philips Nv Wandler zur Umwandlung von akustischen Schwingungen in elektrische Schwingungen und umgekehrt in Form einer Schwingplatte mit mindestens einer Schicht aus piezoelektrischem Material
US3746898A (en) * 1971-10-18 1973-07-17 Bell Telephone Labor Inc Electroacoustic transducer having improved transducing element supporting means
DE2318027A1 (de) * 1972-04-10 1973-11-08 Motorola Inc Akustischer wandler mit einem piezoelektrischen treiber
US3846650A (en) * 1970-10-08 1974-11-05 Dynamics Corp Massa Div Electroacoustic transducer of the vibratile diaphragm type with controlled uniformity of performance characteristics and method for controlling uniformity

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1299724B (de) * 1966-10-21 1969-07-24 Siemens Ag Mikrophonkapsel mit einem piezoelektrischen Wandlerelement und einem Transistorverstaerker
DE1948932A1 (de) * 1968-09-30 1970-04-09 Philips Nv Wandler zur Umwandlung von akustischen Schwingungen in elektrische Schwingungen und umgekehrt in Form einer Schwingplatte mit mindestens einer Schicht aus piezoelektrischem Material
US3846650A (en) * 1970-10-08 1974-11-05 Dynamics Corp Massa Div Electroacoustic transducer of the vibratile diaphragm type with controlled uniformity of performance characteristics and method for controlling uniformity
US3746898A (en) * 1971-10-18 1973-07-17 Bell Telephone Labor Inc Electroacoustic transducer having improved transducing element supporting means
DE2318027A1 (de) * 1972-04-10 1973-11-08 Motorola Inc Akustischer wandler mit einem piezoelektrischen treiber

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JOURNAL OF THE AUDIO ENGINEERING SOCIETY, Vol. 17, April 1969, Nr. 2, Seiten 174,175 New York, U.S.A. J. ROOS UND J. KOORNEEF: "Thin Bilaminar Piezodisks Uses as Microphone and Telephone Membranes" * Seite 174, linke Spalte, Zeile 1 - Seite 175, linke Spalte, Zeile 23; figuren 1,2 * *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0034730A1 (fr) * 1980-02-15 1981-09-02 Siemens Aktiengesellschaft Plaque de transducteur pour transducteurs piézo-électriques
EP0034730B1 (fr) * 1980-02-15 1984-12-05 Siemens Aktiengesellschaft Plaque de transducteur pour transducteurs piézo-électriques

Also Published As

Publication number Publication date
AR228018A1 (es) 1983-01-14
ZA793578B (en) 1980-06-25
BR7904528A (pt) 1980-04-08
GB2025732A (en) 1980-01-23
DE2831362A1 (de) 1980-01-31
JPS5516594A (en) 1980-02-05
AU4893079A (en) 1980-01-24

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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

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AK Designated contracting states

Designated state(s): AT CH DE FR IT NL SE

17P Request for examination filed
STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19811111

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WALLISER, KONRAD, DR.