GB263478A - Loud speakers - Google Patents

Loud speakers

Info

Publication number
GB263478A
GB263478A GB9733/26A GB973326A GB263478A GB 263478 A GB263478 A GB 263478A GB 9733/26 A GB9733/26 A GB 9733/26A GB 973326 A GB973326 A GB 973326A GB 263478 A GB263478 A GB 263478A
Authority
GB
United Kingdom
Prior art keywords
pole
piece
carried
armature
speech coil
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
GB9733/26A
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 GB263478A publication Critical patent/GB263478A/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)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

263,478. Hopkins Corporation, (Assignees of Hopkins, M. C.). Dec. 22, 1925, [Convention date]. Loud-speakers; magnetic instruments. - An electromagnetic movement for a loud-speaker comprises the combination of a speech coil 34, a permanent magnet 9, a pole-piece 14 carried by one pole of the magnet and supporting the speech coil, a pole shoe 39 passing through the polepiece and speech coil. a pole-piece 18 carried by the other pole of the magnet and a polarized armature 21 carried by the second pole-piece. The pole shoe 39 is formed with intersecting slots to reduce eddy currents and has a screwed portion 40 engaging a tapped hole in the pole-piece 14 so that the air gap can be adjusted. To form a friction-tight fit, the pole-piece is slotted through the tapped hole, as shown in Fig. 11, and the two fingers thus produced are squeezed together. As shown, the armature comprises a number of leaves 21 spaced apart at both ends by iron inserts. The armature is connected to a conical diaphragm by a rod 26. Specifications 263,477, 263,481, and 263,484 are referred to.
GB9733/26A 1925-12-22 1926-04-13 Loud speakers Expired GB263478A (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
GB263478A true GB263478A (en) 1927-06-02

Family

ID=22135683

Family Applications (2)

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

Family Applications After (1)

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

Country Status (2)

Country Link
US (1) US1730508A (en)
GB (2) GB263478A (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
GB263484A (en) 1927-07-13
US1730508A (en) 1929-10-08

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