FR669581A - Improvements to acoustic devices - Google Patents

Improvements to acoustic devices

Info

Publication number
FR669581A
FR669581A FR669581DA FR669581A FR 669581 A FR669581 A FR 669581A FR 669581D A FR669581D A FR 669581DA FR 669581 A FR669581 A FR 669581A
Authority
FR
France
Prior art keywords
acoustic devices
acoustic
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.)
Electrical Research Products Inc
Original Assignee
Electrical Research Products Inc
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 Electrical Research Products Inc filed Critical Electrical Research Products Inc
Application granted granted Critical
Publication of FR669581A publication Critical patent/FR669581A/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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
FR669581D 1928-03-31 1929-02-13 Improvements to acoustic devices Expired FR669581A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US266147A US1925659A (en) 1928-03-31 1928-03-31 Acoustic device

Publications (1)

Publication Number Publication Date
FR669581A true FR669581A (en) 1929-11-18

Family

ID=23013372

Family Applications (1)

Application Number Title Priority Date Filing Date
FR669581D Expired FR669581A (en) 1928-03-31 1929-02-13 Improvements to acoustic devices

Country Status (4)

Country Link
US (1) US1925659A (en)
DE (1) DE525850C (en)
FR (1) FR669581A (en)
GB (1) GB308776A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1132833B (en) * 1959-02-16 1962-07-05 Zoellner & Co Bell for acoustic signal devices

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512323A (en) * 1946-09-09 1950-06-20 Radio Frequency Lab Inc Reentrant diaphragm with central closure member
US2548235A (en) * 1947-03-13 1951-04-10 Rca Corp Transformerless audio output system
DE836808C (en) * 1950-05-07 1952-04-17 Friedrich Skwarczynski Loudspeaker membrane for distortion-free reproduction of a wide frequency band with uniform radiation and scattering in the room as well as suppression of the middle frequency range
US2835832A (en) * 1954-05-03 1958-05-20 Calidyne Company Inc Vibration generating apparatus
DE971442C (en) * 1954-08-29 1959-01-29 Standard Elek K Lorenz Ag Dynamic speaker
US3076520A (en) * 1959-05-21 1963-02-05 Claude C Farwell Loud speaker
US8540049B2 (en) 2010-12-23 2013-09-24 Bose Corporation Acoustic diaphragm suspending

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1132833B (en) * 1959-02-16 1962-07-05 Zoellner & Co Bell for acoustic signal devices

Also Published As

Publication number Publication date
GB308776A (en) 1930-04-23
US1925659A (en) 1933-09-05
DE525850C (en) 1931-05-29

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