GB253487A - Electrical sound reproducing instrument - Google Patents

Electrical sound reproducing instrument

Info

Publication number
GB253487A
GB253487A GB9730/26A GB973026A GB253487A GB 253487 A GB253487 A GB 253487A GB 9730/26 A GB9730/26 A GB 9730/26A GB 973026 A GB973026 A GB 973026A GB 253487 A GB253487 A GB 253487A
Authority
GB
United Kingdom
Prior art keywords
pole
reed
diaphragm
pieces
permanent 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
GB9730/26A
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 GB253487A publication Critical patent/GB253487A/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
    • 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
    • H04R11/02—Loudspeakers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

253,487. Hopkins Corporation, Assignees of Hopkins, M. C.). June 11, 1925, [Convention date]. Magnetic instruments ; loudspeakers ; diaphragms. - An electromagnetic device for operating the diaphragm of a loud-speaker or the like comprises a polarized reed projecting from a face plate on one pole a permanent magnet, a speech winding associated with the other pole for actuating the reed and means for connecting an intermediate point of the reed to the diaphragm. As shown in Figs. 3 and 4, angle irons 10. 11 are attached to the two poles of a permanent magnet 9, one angle iron 11 carrying the reed 18 and the other 10 a bifurcated pole shoe 12. Two adjustable pole-pieces 16, 17 are mounted in the pole shoe and surrounding the pole-pieces are speech windings 14. 15 mounted on insulating material 13. The reed 18 projects into the gap between the pole-pieces 16, 17, and an intermediate point of the reed is connected to the centre of the diaphragm 4 by a rod 19. In a modification, Fig. 14, the reed 43 is carried by a resilient plate 42 carried by a shoe 37 mounted on one pole of the permanent magnet 33. A suitable diaphragm is a large paper cone having a slotted flat rim which forms the subject-matter of Specification 252,685, and the whole apparatus is mounted in a flat casing having perforated back and front covers. Specification 253,080 is referred to.
GB9730/26A 1925-06-11 1926-04-13 Electrical sound reproducing instrument Expired GB253487A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US36562A US1630010A (en) 1925-06-11 1925-06-11 Electrical translating device

Publications (1)

Publication Number Publication Date
GB253487A true GB253487A (en) 1927-07-13

Family

ID=21889284

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9730/26A Expired GB253487A (en) 1925-06-11 1926-04-13 Electrical sound reproducing instrument

Country Status (3)

Country Link
US (1) US1630010A (en)
FR (1) FR616420A (en)
GB (1) GB253487A (en)

Also Published As

Publication number Publication date
FR616420A (en) 1927-02-02
US1630010A (en) 1927-05-24

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