JPS5723398A - External magnetic type magnetic circuit of dynamic loudspeaker - Google Patents

External magnetic type magnetic circuit of dynamic loudspeaker

Info

Publication number
JPS5723398A
JPS5723398A JP9746680A JP9746680A JPS5723398A JP S5723398 A JPS5723398 A JP S5723398A JP 9746680 A JP9746680 A JP 9746680A JP 9746680 A JP9746680 A JP 9746680A JP S5723398 A JPS5723398 A JP S5723398A
Authority
JP
Japan
Prior art keywords
diameter
back plate
permeance
magnetic flux
center pole
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
JP9746680A
Other languages
Japanese (ja)
Inventor
Tatsuo Saito
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic 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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP9746680A priority Critical patent/JPS5723398A/en
Publication of JPS5723398A publication Critical patent/JPS5723398A/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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/022—Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

PURPOSE:To decrease a back plate material, and reduce a leakage magnetic flux from its circumferential margin, by determining the thickness of a back plate having an optional diameter which is larger than the diameter of a root part of a center pole, by a specific equation. CONSTITUTION:A magnetic flux density Bm is derived from an intersection point of a straight line based on a coefficient of permeance of a ringlike magnet having the inside diameter Di and the outside diameter D0, and a demagnetizing curve which is determined by a magnetic material. In this regard, the whole permeance of a magnetic circuit, and the sum of leakage permeance are made PT and SIGMAPi, respectively. A pole yoke 10 is constituted of a back plate 10 having a magnetic flux density By, and a center pole 10b which has stood up from this center part. In this case, the thickness of the back plate 10a having an optional diameter D1 which is larger than the diameter Dp of a root part of the center pole 10b is given by the equation -I.
JP9746680A 1980-07-18 1980-07-18 External magnetic type magnetic circuit of dynamic loudspeaker Pending JPS5723398A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9746680A JPS5723398A (en) 1980-07-18 1980-07-18 External magnetic type magnetic circuit of dynamic loudspeaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9746680A JPS5723398A (en) 1980-07-18 1980-07-18 External magnetic type magnetic circuit of dynamic loudspeaker

Publications (1)

Publication Number Publication Date
JPS5723398A true JPS5723398A (en) 1982-02-06

Family

ID=14193070

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9746680A Pending JPS5723398A (en) 1980-07-18 1980-07-18 External magnetic type magnetic circuit of dynamic loudspeaker

Country Status (1)

Country Link
JP (1) JPS5723398A (en)

Similar Documents

Publication Publication Date Title
US3651283A (en) Loudspeaker having elongated rectangular moving coil
ES8104889A1 (en) Electroacoustic transducer for hearing aids
JPS5277718A (en) Electromagnetic type electroacoustic transducer
FR2365267A1 (en) Ear-piece for deaf people - has moulding with coil and magnetic disc fitted to hammer by grips through drum
GB1095915A (en) Improvements in or relating to flowmeters
JPS5723398A (en) External magnetic type magnetic circuit of dynamic loudspeaker
ES270258U (en) Moving coil transducer
JPS5723397A (en) External magnetic type magnetic circuit of dynamic loudspeaker
JPS57165761A (en) Transducer for electro-magnetic ultrasonic wave
JPS579197A (en) Speaker
JPS56161796A (en) Speaker system of passive radiator system
JPS56132094A (en) Speaker
JPS56132095A (en) Speaker
JPS5325419A (en) Speaker
JPS567593A (en) Magnetic circuit for flat diaphragm speaker
JPS5492316A (en) Electromagnetic type electro-acoustic transducer
JPS5299764A (en) Magnetic field type electron lens
JPS5267608A (en) Membrane head for magnetic recording
JPS567596A (en) Speaker unit with coaxial type flat diaphragm
JPS549650A (en) Moving-coil type instrument of pointer transverse travel system
JPS57144000A (en) Acoustic transducer
JPS5880999A (en) Loud speaker
JPS5723396A (en) Field system device
JPS5321799A (en) Assembly fixture for permanent magnet
SU129237A1 (en) The method of adjustment of the electromagnetic system of electroacoustic transducers