GB407998A - Improvements in or relating to permanent magnets - Google Patents

Improvements in or relating to permanent magnets

Info

Publication number
GB407998A
GB407998A GB2710632A GB2710632A GB407998A GB 407998 A GB407998 A GB 407998A GB 2710632 A GB2710632 A GB 2710632A GB 2710632 A GB2710632 A GB 2710632A GB 407998 A GB407998 A GB 407998A
Authority
GB
United Kingdom
Prior art keywords
magnet
piece
portions
pole
gap
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.)
Expired
Application number
GB2710632A
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.)
FREDERIC WILLIAM TETLEY
Swift Levick Magnets Ltd
Original Assignee
FREDERIC WILLIAM TETLEY
Swift Levick and Sons 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 FREDERIC WILLIAM TETLEY, Swift Levick and Sons Ltd filed Critical FREDERIC WILLIAM TETLEY
Priority to GB2710632A priority Critical patent/GB407998A/en
Publication of GB407998A publication Critical patent/GB407998A/en
Expired 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
    • H04R2209/024—Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/006—Interconnection of transducer parts

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Road Signs Or Road Markings (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

407,998. Sound reproducing and transmitting devices. SWIFT, LEVICK, & SONS, Ltd., HORSBURGH, G. D. L., and TETLEY, F. W., Clarence Steel Works, Sheffield. Sept. 29, 1932, No. 27106. [Class 40 (iv).] A magnet with a narrow air-gap, such as is employed in sound reproducing or transmitting apparatus, is provided with a pole-piece of two or more portions separate from the body of the magnet, so that by suitable choice of the shape and materials of the portions of the pole-piece the flux-density in the air-gap can be regulated without altering the body of the magnet. The Figure shows a magnet with a body formed of a bar 5 with upturned ends 6, 7 and a mild steel plate 8 forming the outer pole-piece. The inner polepiece is formed of two portions 11, 12 secured to each other and to the body of the magnet by a screw 13. The portion 12 may be made of mild steel or soft iron and the portion 11 of magnet steel. The portion 11 may be rectangular to give a greater surface of contact with the body of the magnet.
GB2710632A 1932-09-29 1932-09-29 Improvements in or relating to permanent magnets Expired GB407998A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2710632A GB407998A (en) 1932-09-29 1932-09-29 Improvements in or relating to permanent magnets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2710632A GB407998A (en) 1932-09-29 1932-09-29 Improvements in or relating to permanent magnets

Publications (1)

Publication Number Publication Date
GB407998A true GB407998A (en) 1934-03-29

Family

ID=10254279

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2710632A Expired GB407998A (en) 1932-09-29 1932-09-29 Improvements in or relating to permanent magnets

Country Status (1)

Country Link
GB (1) GB407998A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4412104A (en) * 1978-11-24 1983-10-25 Hitachi Metals, Ltd. Rectangular magnetic circuit for speaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4412104A (en) * 1978-11-24 1983-10-25 Hitachi Metals, Ltd. Rectangular magnetic circuit for speaker

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