EP0085194A1 - Transducteur électro-acoustique - Google Patents

Transducteur électro-acoustique Download PDF

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Publication number
EP0085194A1
EP0085194A1 EP82200060A EP82200060A EP0085194A1 EP 0085194 A1 EP0085194 A1 EP 0085194A1 EP 82200060 A EP82200060 A EP 82200060A EP 82200060 A EP82200060 A EP 82200060A EP 0085194 A1 EP0085194 A1 EP 0085194A1
Authority
EP
European Patent Office
Prior art keywords
electro
wall
acoustical
comprised
aperture
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Withdrawn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
EP82200060A
Other languages
German (de)
English (en)
Inventor
Hugo R. Michiels
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP82200060A priority Critical patent/EP0085194A1/fr
Priority to JP58007185A priority patent/JPS58130699A/ja
Publication of EP0085194A1 publication Critical patent/EP0085194A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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 
    • H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for telephonic receivers

Definitions

  • the present invention relates to an electro-acoustical converter with a closed vibration space, one wall.of which is formed by a vibrating plate consisting of a metallic diaphragm clamped at its peripheral edge, on which diaphragm is fixed a disk made of a piezo-electric material.
  • Such an electro-acoustical converter is well known in engineering and the invention has in view to provide a suchlike converter with a nearly flat sound intensity/frequency characteristic in the range of the lower frequencies from about 800 Hz to about 4000 Hz.
  • this objective is attained through the fact that this vibrating plate is acoustically coupled with an acoustical filter which is formed by at least two successive chambers that are communicating via at least one first aperture in an intermediate wall, the first of these chambers of this vibration space being separated by this vibrating plate and the second of these chambers communicating with the ambient air via at least one second aperture in an outside wall.
  • the acoustical filter ameliorates the acoustical adaption between the vibration space and ambient air, whereby the aforesaid lower frequency range is reproduced more strongly and about uniformly.
  • This converter comprises a cylindrical housing B with a diameter D and length L and provided with a vibration space TR with the length L 1 and with an acoustical filter AF, acoustically coupled therewith, with the length L 2 + L 3 .
  • This filter comprises two successive chambers K 1 and K 2 with the respective lengths L 2 and L 3 .
  • the ratios and are respectively comprised between 4 and 10; 10 and 60; and 9 and 30.
  • the vibration chamber TR is completely closed and separated from the filter chamber K 1 by a vibrating plate TP.
  • This vibrating plate TP consists of a circular metal diaphragm M which at its circumferential edge is fixed to the housing B and which, in its central zone, is firmly assembled, for instance by means of glue, with a circular disk S which is made of a piezo-electric material, for instance piezo-electric ceramics.
  • the disk S is connected with two electric connecting cables E 1 and E 2 .
  • the metal of this diaphragm has a modulus of elasticity comprised between 6,5. 1 0 3 N/mm 2 and 210 . 1 0 3 N/mm 2 and its density is comprised between 1,5.10 kg/m and 10.10 3 kg / m 3 .
  • the thickness of this diaphragm M is comprised between 0,5 and 1,2 times the thickness of the disk S and the diameter of this disk is comprised between 0,3 and 0,9 times the diameter of the diaphragm M.
  • the filter chamber K 1 with a volume V 1 communicates with the filter chamber K 2 with a volume V 2 via a circular aperture O 1 with a diameter D 1 in a intermediate wall TW with a tickness d l , the product d 1 .D 1 being comprised between 2 mm2 and 1 2 mm2.
  • the filter chamber K 2 communicates with the ambient air via a multiplicity of circular apertures as are 0 2 and 0 3 , in the outer wall BW with a tickness d l .
  • These apertures have respectively diameters D 2 and D 3 and the product of the sum of the diameters of all the apertures, that is to say D 2 + D 3 + ..., and the thickness d 2 is comprised between 10 mm 2 and 20 mm2.
  • the intermediate wall TW and outer wall BW are both made of a vibration damping plastic material, for instance polyamide, in order that these walls should not form parasi- tary sources of vibration.
  • the sound intensity/frequency characteristic is being ameliorated.
  • the own frequency of the mechanical system is being heightened.
  • the frequency range extending between the first and second resonance frequencies of the vibrating plate TP is, however, being reproduced too weakly.
  • this filter extending within the frequency band that extends between the aforesaid first and second frequencies has an impedance-transforming action, whereby the adaption between the vibrating plate and air becomes ameliorated. Furthermore, this filter acts as a low pass filter, the tipping over frequency being chosen so that the higher frequency band is being strongly weakened. This is a consequence of the values chosen of the aforesaid ratios , and , thicknesses d 1 and d 2 and products D 1 .d 1 and (D 2 +D 3 +.d 2 .
  • the equivalent electric diagram of the acoustical filter is shown in figure 2 and comprises :

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)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
EP82200060A 1982-01-19 1982-01-19 Transducteur électro-acoustique Withdrawn EP0085194A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP82200060A EP0085194A1 (fr) 1982-01-19 1982-01-19 Transducteur électro-acoustique
JP58007185A JPS58130699A (ja) 1982-01-19 1983-01-19 電気音響変換器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82200060A EP0085194A1 (fr) 1982-01-19 1982-01-19 Transducteur électro-acoustique

Publications (1)

Publication Number Publication Date
EP0085194A1 true EP0085194A1 (fr) 1983-08-10

Family

ID=8189453

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82200060A Withdrawn EP0085194A1 (fr) 1982-01-19 1982-01-19 Transducteur électro-acoustique

Country Status (2)

Country Link
EP (1) EP0085194A1 (fr)
JP (1) JPS58130699A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4607145A (en) * 1983-03-07 1986-08-19 Thomson-Csf Electroacoustic transducer with a piezoelectric diaphragm
FR2587870A1 (fr) * 1985-09-24 1987-03-27 Elkron France Haut-parleur a chambre de compression et sirene d'alarme equipee d'un tel haut-parleur
EP0239307A2 (fr) * 1986-03-24 1987-09-30 Alcatel N.V. Avertisseur en miniature à double cavité
US4979219A (en) * 1989-03-14 1990-12-18 Lin Kuang Yao Piezoelectric speakers
CN104952438A (zh) * 2015-07-10 2015-09-30 常州汇森电子有限公司 具有扩音信号增强效果的蜂鸣器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63278490A (ja) * 1987-05-08 1988-11-16 Matsushita Electric Ind Co Ltd 動電型ユニット

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006371A (en) * 1973-03-19 1977-02-01 Whitewater Electronics, Inc. Electroacoustical transducer comprising piezoelectric element
GB2025734A (en) * 1978-07-17 1980-01-23 Siemens Ag Electro-acoustictransducer
DE3007773A1 (de) * 1980-02-29 1981-09-17 Siemens AG, 1000 Berlin und 8000 München Elektroakustischer wandler

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006371A (en) * 1973-03-19 1977-02-01 Whitewater Electronics, Inc. Electroacoustical transducer comprising piezoelectric element
GB2025734A (en) * 1978-07-17 1980-01-23 Siemens Ag Electro-acoustictransducer
DE3007773A1 (de) * 1980-02-29 1981-09-17 Siemens AG, 1000 Berlin und 8000 München Elektroakustischer wandler

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4607145A (en) * 1983-03-07 1986-08-19 Thomson-Csf Electroacoustic transducer with a piezoelectric diaphragm
FR2587870A1 (fr) * 1985-09-24 1987-03-27 Elkron France Haut-parleur a chambre de compression et sirene d'alarme equipee d'un tel haut-parleur
EP0239307A2 (fr) * 1986-03-24 1987-09-30 Alcatel N.V. Avertisseur en miniature à double cavité
EP0239307A3 (en) * 1986-03-24 1988-04-06 Alcatel N.V. Miniature dual cavity ringer
US4979219A (en) * 1989-03-14 1990-12-18 Lin Kuang Yao Piezoelectric speakers
CN104952438A (zh) * 2015-07-10 2015-09-30 常州汇森电子有限公司 具有扩音信号增强效果的蜂鸣器

Also Published As

Publication number Publication date
JPS58130699A (ja) 1983-08-04

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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 BE CH DE FR GB IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19840411