GB284343A - Improvements in or connected with souud reproducing devices - Google Patents

Improvements in or connected with souud reproducing devices

Info

Publication number
GB284343A
GB284343A GB2706/28A GB270628A GB284343A GB 284343 A GB284343 A GB 284343A GB 2706/28 A GB2706/28 A GB 2706/28A GB 270628 A GB270628 A GB 270628A GB 284343 A GB284343 A GB 284343A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
loud
conical member
forest
speakers
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
GB2706/28A
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.)
FOREST PHONOFILMS Ltd DE
Original Assignee
FOREST PHONOFILMS Ltd DE
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 FOREST PHONOFILMS Ltd DE filed Critical FOREST PHONOFILMS Ltd DE
Publication of GB284343A publication Critical patent/GB284343A/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
    • H04R7/04—Plane diaphragms
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

284,343. De Forest Phonofilms, Ltd., (Assignees of Forest, L. de). Jan. 29, 1927, [Convention date]. Loud-speakers; diaphragms. - A loud-speaker adapted to reproduce more faithfully the lower and higher frequencies of the audible range comprises a conical member 7 resiliently supported on arms 9 by a flexible ring 12 and connected by a truncated conical member 13 to a flat diaphragm 15, which is supported at the edge by a member 18 provided with a ring or projections 17 adapted to tension the diaphragm to any desired degree. The conical member carries a coil 5 lying in the circular air gap of an electromagnet 2. The diaphragm 15 is made of flexible material such as parchment, sheepskin, woven fabric, or thin metal, e.g. aluminium, and may have a circular, rectangular, or polygonal outline. The cone 7 may be made of paper and may be built up in concentric sections. To secure satisfactory reproduction over the entire audible range a number of loud-speakers may be used simultaneously. The Specification as open to inspection under Sect. 91 (3) (a) states that the diaphragm 15 may be made of the material known under the registered Trade Mark " Duralumin." This subjectmatter does not appear in the Specification as accepted.
GB2706/28A 1927-01-29 1928-01-27 Improvements in or connected with souud reproducing devices Expired GB284343A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US164582A US1827283A (en) 1927-01-29 1927-01-29 Sound reproducer

Publications (1)

Publication Number Publication Date
GB284343A true GB284343A (en) 1928-09-27

Family

ID=22595142

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2706/28A Expired GB284343A (en) 1927-01-29 1928-01-27 Improvements in or connected with souud reproducing devices

Country Status (2)

Country Link
US (1) US1827283A (en)
GB (1) GB284343A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1341581A (en) * 1962-09-11 1963-11-02 Electronique & Automatisme Sa Rotating electric machine with flat annular air gap
DE2236374C3 (en) * 1972-07-25 1975-01-16 Josef Wilhelm 8725 Arnstein Manger Electroacoustic transducer system
US4511768A (en) * 1982-10-29 1985-04-16 Motorola, Inc. Mounting arrangement for altering a microphone's frequency response
US5123053A (en) * 1990-07-11 1992-06-16 Harman International Industries, Incorporated Loudspeaker suspension

Also Published As

Publication number Publication date
US1827283A (en) 1931-10-13

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