GB306839A - Improvements in loud speakers - Google Patents

Improvements in loud speakers

Info

Publication number
GB306839A
GB306839A GB6139/29A GB613929A GB306839A GB 306839 A GB306839 A GB 306839A GB 6139/29 A GB6139/29 A GB 6139/29A GB 613929 A GB613929 A GB 613929A GB 306839 A GB306839 A GB 306839A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
coil
loud
annulus
periphery
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
GB6139/29A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB306839A publication Critical patent/GB306839A/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
    • H04R9/041—Centering
    • H04R9/042—Centering by pressurised air

Abstract

306,839. Beyer, E. Feb. 25, 1928, [Convention date]. Void [Published under Sect. 91 of the Acts]. Loud-speakers; diaphragms.-In a loud-speaker of the large diaphragm type, the coil or other drive is placed where the forces opposing motion, viz., air-pressure and restoring force due to mounting, are greatest.. The coil 13. Figs. 1, 3, wound on the cylinder 12 is fixed to the edge of the diaphragm 1, which may be conical, spherical, hyperbolic, parabolic or of similar form, and is immersed in an annular gap 17 between the pole-pieces of a pot-magnet energized by winding 11. The diaphragm is suspended by a resilient band 3, Fig. 2, threaded through eyelets 4 and 5 attached to a stiffening annulus 2 and wooden rings 6 some distance from its periphery, the gap being closed by an annulus 7 of flexible material, not under tension. In a modification the centre of the diaphragm is supported in addition to the periphery, and driven by a separate coil and magnet system.
GB6139/29A 1928-02-25 1929-02-25 Improvements in loud speakers Expired GB306839A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE306839X 1928-02-25

Publications (1)

Publication Number Publication Date
GB306839A true GB306839A (en) 1929-05-30

Family

ID=6121236

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6139/29A Expired GB306839A (en) 1928-02-25 1929-02-25 Improvements in loud speakers

Country Status (1)

Country Link
GB (1) GB306839A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2478642A (en) * 1946-10-09 1949-08-09 John J Root Combined moving coil loudspeaker and transformer
US3046362A (en) * 1956-11-06 1962-07-24 Stanley F White Speaker
US4165448A (en) * 1978-03-31 1979-08-21 Haruo Ishikawa Loudspeaker with improved voice coil support

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2478642A (en) * 1946-10-09 1949-08-09 John J Root Combined moving coil loudspeaker and transformer
US3046362A (en) * 1956-11-06 1962-07-24 Stanley F White Speaker
US4165448A (en) * 1978-03-31 1979-08-21 Haruo Ishikawa Loudspeaker with improved voice coil support

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