JPS57188200A - Electret capacitor type transducer - Google Patents

Electret capacitor type transducer

Info

Publication number
JPS57188200A
JPS57188200A JP7260981A JP7260981A JPS57188200A JP S57188200 A JPS57188200 A JP S57188200A JP 7260981 A JP7260981 A JP 7260981A JP 7260981 A JP7260981 A JP 7260981A JP S57188200 A JPS57188200 A JP S57188200A
Authority
JP
Japan
Prior art keywords
electret
fixed pole
distortion
sound pressure
smaller
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.)
Granted
Application number
JP7260981A
Other languages
Japanese (ja)
Other versions
JPS6239880B2 (en
Inventor
Hiroto Wada
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP7260981A priority Critical patent/JPS57188200A/en
Publication of JPS57188200A publication Critical patent/JPS57188200A/en
Publication of JPS6239880B2 publication Critical patent/JPS6239880B2/ja
Granted 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
    • H04R19/00—Electrostatic transducers
    • H04R19/01—Electrostatic transducers characterised by the use of electrets

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

PURPOSE:To improve the distortion characteristics and sensitivity, by forming electric charges at the back side of an electret of an electret capacitor type transducer with a distribution that the center is smaller than the circumference. CONSTITUTION:On an electrode fixed pole 21 of a microphone of back electret type, a moving pole 24 having a specified gap with a spacer 22 and suspended with a support ring 23 is opposingly provided, and a back electrode of an electret fixed pole 21 is connected to an output terminal OUT via an impedance conversion circuit having a field effect transistor FET21, etc. The electret fixed pole 21 has radial or lattice unevenness (small electric charge at rough part and large electric charge for dense part) for example, so that the electric charges at the center M are smaller than those at both ends. Thus, correct static balance is taken at no sound pressure, and no distortion is caused at any half wave with a sound pressure, allowing to achieve low distortion factor and high fidelity.
JP7260981A 1981-05-14 1981-05-14 Electret capacitor type transducer Granted JPS57188200A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7260981A JPS57188200A (en) 1981-05-14 1981-05-14 Electret capacitor type transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7260981A JPS57188200A (en) 1981-05-14 1981-05-14 Electret capacitor type transducer

Publications (2)

Publication Number Publication Date
JPS57188200A true JPS57188200A (en) 1982-11-19
JPS6239880B2 JPS6239880B2 (en) 1987-08-25

Family

ID=13494300

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7260981A Granted JPS57188200A (en) 1981-05-14 1981-05-14 Electret capacitor type transducer

Country Status (1)

Country Link
JP (1) JPS57188200A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009290638A (en) * 2008-05-30 2009-12-10 Audio Technica Corp Diaphragm for capacitor microphone and method of manufacturing the same, and capacitor microphone

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0226486U (en) * 1988-08-03 1990-02-21

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009290638A (en) * 2008-05-30 2009-12-10 Audio Technica Corp Diaphragm for capacitor microphone and method of manufacturing the same, and capacitor microphone

Also Published As

Publication number Publication date
JPS6239880B2 (en) 1987-08-25

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