GB252685A - Cone type loud speaker - Google Patents

Cone type loud speaker

Info

Publication number
GB252685A
GB252685A GB9728/26A GB972826A GB252685A GB 252685 A GB252685 A GB 252685A GB 9728/26 A GB9728/26 A GB 9728/26A GB 972826 A GB972826 A GB 972826A GB 252685 A GB252685 A GB 252685A
Authority
GB
United Kingdom
Prior art keywords
edge
diaphragm
hopkins
loud
limb
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
GB9728/26A
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 GB252685A publication Critical patent/GB252685A/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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

252,685. Hopkins Corporation, (Assignees of Hopkins, M. C.). June 1, 1925, [Convention date]. Loud - speakers; diaphragms. - A loud-speaker has a large conical diaphragm of light weight and made of stiff fibrous material, is iormed near its edge with one or more reverse bends forming a comparatively narrow flexible rim, by which it is mounted. As shown in Fig. 2, the conical diaphragm 1 has one reverse bend 2 forming a rim which is cemented along its edge to a circular metal frame 3. The edge of the frame is bent over to cover and protect the edge of the diaphragm. In the construction shown in Fig. 1, there are three bends 2 ... 2<11>. A suitable material for the diaphragm is a wellaged, long fibred, brittle paper. The supporting frame 3, which is carried by a post 6 secured to a base piece 7, is formed with a central aperture in which the electrical movement is secured and with a number of openings 10 ... 12 for the emission of sound. The electrical movement, comprising a polarized reed 23 projecting from one limb of a permanent magnet 13 into the gap on a bifurcated pole-piece on the other limb, forms the subject-matter of Specification 253,080.
GB9728/26A 1925-06-01 1926-04-13 Cone type loud speaker Expired GB252685A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US34255A US1630008A (en) 1925-06-01 1925-06-01 Cone-type loud speaker

Publications (1)

Publication Number Publication Date
GB252685A true GB252685A (en) 1927-06-02

Family

ID=21875256

Family Applications (2)

Application Number Title Priority Date Filing Date
GB28790/26A Expired GB261426A (en) 1925-06-01 1926-04-13 Cone type loud speaker
GB9728/26A Expired GB252685A (en) 1925-06-01 1926-04-13 Cone type loud speaker

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB28790/26A Expired GB261426A (en) 1925-06-01 1926-04-13 Cone type loud speaker

Country Status (6)

Country Link
US (1) US1630008A (en)
BE (1) BE334366A (en)
DE (1) DE551526C (en)
FR (1) FR616148A (en)
GB (2) GB261426A (en)
NL (1) NL21057C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2810447A (en) * 1955-05-31 1957-10-22 Ford Motor Co Rear seat speaker
US5418337A (en) * 1993-05-28 1995-05-23 Bose Corporation Loudspeaker driver surrounding

Also Published As

Publication number Publication date
US1630008A (en) 1927-05-24
GB261426A (en) 1927-04-21
BE334366A (en)
NL21057C (en)
DE551526C (en) 1932-06-02
FR616148A (en) 1927-01-24

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