JPS55104199A - Acoustic converter of electromagnetic type - Google Patents

Acoustic converter of electromagnetic type

Info

Publication number
JPS55104199A
JPS55104199A JP1123779A JP1123779A JPS55104199A JP S55104199 A JPS55104199 A JP S55104199A JP 1123779 A JP1123779 A JP 1123779A JP 1123779 A JP1123779 A JP 1123779A JP S55104199 A JPS55104199 A JP S55104199A
Authority
JP
Japan
Prior art keywords
iron core
coil
vibration plate
electromagnet
sound pressure
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.)
Pending
Application number
JP1123779A
Other languages
Japanese (ja)
Inventor
Setsuo Furuse
Yuji Migaki
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.)
TDK Corp
Original Assignee
TDK 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 TDK Corp filed Critical TDK Corp
Priority to JP1123779A priority Critical patent/JPS55104199A/en
Publication of JPS55104199A publication Critical patent/JPS55104199A/en
Pending 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
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet

Landscapes

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

Abstract

PURPOSE:To obtain the acoustic converter of simple construction and constant quality, by driving the electromagnet with AC current of lower frequency than the natural resonant frequency of the vibration plate and reducing the width of sound pressure to the change to air gap. CONSTITUTION:At the bottom of the case 1 of inner cylinder made of non-magnetic metal material, the step 1a of ring shape widening the inner circumference is formed, and further, in the step 1a, the printed board 2 and the washer 5 having the iron core 4 with the coil 3 are inserted and bonded with laminated state, and cylindrical permanent magnet 6 is located so that the electromagnet consisting of the coil 3 and the iron core 4 can be enclosed. Further, at the upper opening of the case 1, the vibration plate 7 is mounted to the tip 4a of the iron core 4 and the upper end 6a of the magnet 6 via respectively air gaps G1 and G2. Further, the electromagnet consisting of the coil 3 and the iron core 4 is driven with the AC current having lower frequency than the natural frequency of the vibration plate 7 to reduce the sound pressure variation width due to the changes in the air gaps G1 and G2.
JP1123779A 1979-02-02 1979-02-02 Acoustic converter of electromagnetic type Pending JPS55104199A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1123779A JPS55104199A (en) 1979-02-02 1979-02-02 Acoustic converter of electromagnetic type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1123779A JPS55104199A (en) 1979-02-02 1979-02-02 Acoustic converter of electromagnetic type

Publications (1)

Publication Number Publication Date
JPS55104199A true JPS55104199A (en) 1980-08-09

Family

ID=11772320

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1123779A Pending JPS55104199A (en) 1979-02-02 1979-02-02 Acoustic converter of electromagnetic type

Country Status (1)

Country Link
JP (1) JPS55104199A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2476872C1 (en) * 2011-09-09 2013-02-27 Закрытое акционерное общество "Ультракрафт" Ultrasonic testing method of metallurgical products with electromagnetic acoustic transducers on air cushion, and device for its implementation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2476872C1 (en) * 2011-09-09 2013-02-27 Закрытое акционерное общество "Ультракрафт" Ultrasonic testing method of metallurgical products with electromagnetic acoustic transducers on air cushion, and device for its implementation

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