GB263484A - Loud speaker - Google Patents

Loud speaker

Info

Publication number
GB263484A
GB263484A GB28283/26A GB2828326A GB263484A GB 263484 A GB263484 A GB 263484A GB 28283/26 A GB28283/26 A GB 28283/26A GB 2828326 A GB2828326 A GB 2828326A GB 263484 A GB263484 A GB 263484A
Authority
GB
United Kingdom
Prior art keywords
pole
shoe
piece
reed
magnet
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
GB28283/26A
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.)
HOPKINS CORP
Original Assignee
HOPKINS 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 HOPKINS CORP filed Critical HOPKINS CORP
Publication of GB263484A publication Critical patent/GB263484A/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
    • H04R11/00—Transducers of moving-armature or moving-core type

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)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

263,484. Hopkins Corporation, (Assignees of Hopkins, M. C.). Dec. 22, 1925, [Convention date]. Magnetic instruments. - An electromagnetic movement for a loud-speaker has an armature comprising a number of laminations spaced apart by iron inserts. As shown the movement comprises a permanent magnet 9, a polarized reed 21, and a speech coil 34 surrounding an adjustable pole-shoe 39. The reed comprises four steel leaves 21, a soft iron element 24 at the free end, and iron spacing washers 22, 23 at both ends. The reed is attached to a pole-piece 18 of the magnet by a bolt 20, and the free end is connected to the centre of a large conical diaphragm by a rod 26. To the other end of the magnet is attached a bracket-like pole-shoe 14 having a tapped hole in which is screwed a transverse pole-piece 39 passing through the speech coil. The pole-shoe is slotted through the tapped hole and the two fingers thus produced are squeezed together to give a frictional grip on the tapped portion of the polepiece. The end of the pole-piece is formed with intersecting slots to reduce eddy currents. Specifications 263,477, 263,478, and 263,481 are referred to.
GB28283/26A 1925-12-22 1926-04-13 Loud speaker Expired GB263484A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77030A US1730508A (en) 1925-12-22 1925-12-22 Loud-speaker

Publications (1)

Publication Number Publication Date
GB263484A true GB263484A (en) 1927-07-13

Family

ID=22135683

Family Applications (2)

Application Number Title Priority Date Filing Date
GB28283/26A Expired GB263484A (en) 1925-12-22 1926-04-13 Loud speaker
GB9733/26A Expired GB263478A (en) 1925-12-22 1926-04-13 Loud speakers

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB9733/26A Expired GB263478A (en) 1925-12-22 1926-04-13 Loud speakers

Country Status (2)

Country Link
US (1) US1730508A (en)
GB (2) GB263484A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104105039A (en) * 2014-08-12 2014-10-15 胡达广 High-efficiency broadband loudspeaker

Also Published As

Publication number Publication date
US1730508A (en) 1929-10-08
GB263478A (en) 1927-06-02

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