GB240425A - - Google Patents

Info

Publication number
GB240425A
GB240425A GB21500/25A GB2150025A GB240425A GB 240425 A GB240425 A GB 240425A GB 21500/25 A GB21500/25 A GB 21500/25A GB 2150025 A GB2150025 A GB 2150025A GB 240425 A GB240425 A GB 240425A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
coil
loud
shoes
connections
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
GB21500/25A
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 GB240425A publication Critical patent/GB240425A/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
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture

Abstract

240,425. Bothe, O. Sept. 26, 1924, [Convention date]. Loud-speakers; magnetic instruments; diaphragms.-In a loud-speaker in which a diaphragm 19 arranged to move always parallel to itself carries a coil 21 in the field of a magnet,. the current variations supplied to the coil 21 are superposed upon direct current so that the diaphragm always experiences a pull in one direction, which pull is counterbalanced by the elasticity of the air beneath the diaphragm. The size of the air space and the strength of the direct current are chosen so that the reduction of amplitude due to the damping of the air space falls with increase of frequency in the same degree as the impedance of the coil rises. The central conical portion of the diaphragm is formed of two thicknesses of celluloid or bakelitized paper with a softer layer such as tissue paper between them. The natural frequency of the diaphragm is preferably below the audible range. The wires 22, 23 leading to the coil 21 are secured to the shoes 24, 25 on the underside of the diaphragm rim 17 so that the connections are not disturbed when the diaphragm is removed. Connections are led from the shoes, 24, 25 to terminals 32. The whole instrument may be placed in a casing 33, across the aperture in which is a perforated plate 35.
GB21500/25A 1924-09-26 1925-08-27 Expired GB240425A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE240425X 1924-09-26

Publications (1)

Publication Number Publication Date
GB240425A true GB240425A (en) 1926-04-15

Family

ID=5905999

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21500/25A Expired GB240425A (en) 1924-09-26 1925-08-27

Country Status (1)

Country Link
GB (1) GB240425A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122314A (en) * 1976-12-23 1978-10-24 Sony Corporation Loudspeaker having a laminate diaphragm of three layers
US4205205A (en) * 1978-06-12 1980-05-27 Babbco, Ltd. Dynamic loudspeaker having magnetic assembly adhesively bonded within a surrounding basket

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122314A (en) * 1976-12-23 1978-10-24 Sony Corporation Loudspeaker having a laminate diaphragm of three layers
US4205205A (en) * 1978-06-12 1980-05-27 Babbco, Ltd. Dynamic loudspeaker having magnetic assembly adhesively bonded within a surrounding basket

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