GB708773A - Improvements in or relating to sound recording apparatus - Google Patents

Improvements in or relating to sound recording apparatus

Info

Publication number
GB708773A
GB708773A GB768552A GB768552A GB708773A GB 708773 A GB708773 A GB 708773A GB 768552 A GB768552 A GB 768552A GB 768552 A GB768552 A GB 768552A GB 708773 A GB708773 A GB 708773A
Authority
GB
United Kingdom
Prior art keywords
former
core
carries
pole pieces
relating
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
GB768552A
Inventor
William Joseph O'brien
Patrick Bernard Cooper
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.)
Decca Record Co Ltd
Original Assignee
Decca Record 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 Decca Record Co Ltd filed Critical Decca Record Co Ltd
Priority to GB768552A priority Critical patent/GB708773A/en
Publication of GB708773A publication Critical patent/GB708773A/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
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/046—Construction

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Magnetic Heads (AREA)

Abstract

708,773. Phonographic recorders. DECCA RECORD CO., Ltd. Feb. 4, 1953 [March 25, 1952], No. 7685/52. Class 40 (4) The moving coil 18 of a sound recorder for lateral-cut records is mounted for oscillatory movement between a ferro-magnetic core 15 and magnet pole pieces 10, 11 by torsionallyresilient members 20, 21, the coil being carried by a light alloy former 17 containing a viscous damping fluid which fills the gap between the former and the core. A narrowed portion 19 of the former carries a cutting stylus (not shown). The pole pieces and their spacers 12, 13 are secured to a brass plate 14 which carries a cylindrical brass support 16 for the ferromagnetic core.
GB768552A 1952-03-25 1952-03-25 Improvements in or relating to sound recording apparatus Expired GB708773A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB768552A GB708773A (en) 1952-03-25 1952-03-25 Improvements in or relating to sound recording apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB768552A GB708773A (en) 1952-03-25 1952-03-25 Improvements in or relating to sound recording apparatus

Publications (1)

Publication Number Publication Date
GB708773A true GB708773A (en) 1954-05-12

Family

ID=9837829

Family Applications (1)

Application Number Title Priority Date Filing Date
GB768552A Expired GB708773A (en) 1952-03-25 1952-03-25 Improvements in or relating to sound recording apparatus

Country Status (1)

Country Link
GB (1) GB708773A (en)

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