FR666922A - Improvements to hearing devices - Google Patents

Improvements to hearing devices

Info

Publication number
FR666922A
FR666922A FR666922DA FR666922A FR 666922 A FR666922 A FR 666922A FR 666922D A FR666922D A FR 666922DA FR 666922 A FR666922 A FR 666922A
Authority
FR
France
Prior art keywords
hearing devices
hearing
devices
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
Other languages
French (fr)
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
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
Priority claimed from GB1086027A external-priority patent/GB294285A/en
Application filed by Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Application granted granted Critical
Publication of FR666922A publication Critical patent/FR666922A/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
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • 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
    • H04R9/045—Mounting

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
FR666922D 1927-04-22 1929-01-04 Improvements to hearing devices Expired FR666922A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1086027A GB294285A (en) 1928-01-07 1927-04-22 Improvements in or relating to electro-acoustic devices
GB60228A GB309226A (en) 1928-01-07 1928-01-07 Improvements in or relating to acoustic devices

Publications (1)

Publication Number Publication Date
FR666922A true FR666922A (en) 1929-10-08

Family

ID=26236054

Family Applications (2)

Application Number Title Priority Date Filing Date
FR653092D Expired FR653092A (en) 1927-04-22 1928-04-19 Improvements to hearing devices
FR666922D Expired FR666922A (en) 1927-04-22 1929-01-04 Improvements to hearing devices

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR653092D Expired FR653092A (en) 1927-04-22 1928-04-19 Improvements to hearing devices

Country Status (4)

Country Link
US (2) US2002189A (en)
BE (2) BE357157A (en)
FR (2) FR653092A (en)
NL (1) NL28724C (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469773A (en) * 1934-06-04 1949-05-10 Jensen Mfg Company Loud-speaker diaphragm support member
US2513171A (en) * 1948-11-26 1950-06-27 Fauthal A Hassan Loud-speaker diaphragm with stiffening struts
GB698695A (en) * 1951-01-11 1953-10-21 Lustraphone Ltd Improvements in or relating to microphones
US4239943A (en) * 1977-11-17 1980-12-16 Cerwin Vega, Inc. Adjustable dual spider for a loudspeaker
US4373607A (en) * 1979-08-03 1983-02-15 Miller Charles D Loudspeaker cone stiffeners
US5123053A (en) * 1990-07-11 1992-06-16 Harman International Industries, Incorporated Loudspeaker suspension
US6611604B1 (en) 1999-10-22 2003-08-26 Stillwater Designs & Audio, Inc. Ultra low frequency transducer and loud speaker comprising same

Also Published As

Publication number Publication date
FR653092A (en) 1929-03-15
BE357157A (en)
BE350724A (en)
US2002190A (en) 1935-05-21
NL28724C (en)
US2002189A (en) 1935-05-21

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