GB310759A - Improvements relating to electro-magnetic acoustic devices - Google Patents

Improvements relating to electro-magnetic acoustic devices

Info

Publication number
GB310759A
GB310759A GB32252/27A GB3225227A GB310759A GB 310759 A GB310759 A GB 310759A GB 32252/27 A GB32252/27 A GB 32252/27A GB 3225227 A GB3225227 A GB 3225227A GB 310759 A GB310759 A GB 310759A
Authority
GB
United Kingdom
Prior art keywords
reflector
ring
polepiece
annular
diaphragm
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
GB32252/27A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 to BE356544D priority Critical patent/BE356544A/fr
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB32252/27A priority patent/GB310759A/en
Priority to FR36325D priority patent/FR36325E/en
Publication of GB310759A publication Critical patent/GB310759A/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
    • H04R9/025—Magnetic circuit
    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/02—Loudspeakers
    • 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
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • 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
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
    • 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
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
    • 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
    • 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
    • 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
    • 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
    • H04R9/063—Loudspeakers using a plurality of acoustic drivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Electromechanical Clocks (AREA)

Abstract

310,759. British Thomson-Kouston Co., Ltd., and Young, A. P. Nov. 30, 1927. Loud - speakers; magnetic instruments. - The moving coil 3 is connected to the diaphragm 2 by a pivotally mounted rod or lever 1, which may be formed integrally with a transverse spindle carried in adjustable bearings. One polepiece 8 extends into the jaws of the other 9, as shown in Fig. 3. In a modification the pole-piece 8 is circular in section, the two arms of the polepiece 9 being curved so as to form an annular gap. The conical diaphragm may be supported from an annular ring (Fig. 4, not shown) secured to the flared edge of a reflector, the space between the ring and the reflector forming an annular opening through which the reflected sound waves issue. The ring acts to some extent as a baflle, as described in Specifications 231,421 and 245,796. The Provisional Specification states that the reflector may be made of the material known under the registered Trade Mark " Fabrolite," and that the pivotal axis of the coil may be vertical. Specification 203,652 also is referred to.
GB32252/27A 1925-01-09 1927-11-30 Improvements relating to electro-magnetic acoustic devices Expired GB310759A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE356544D BE356544A (en) 1925-01-09
GB32252/27A GB310759A (en) 1925-01-09 1927-11-30 Improvements relating to electro-magnetic acoustic devices
FR36325D FR36325E (en) 1925-01-09 1928-11-29 Improvements to sound-producing devices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1483A US1707617A (en) 1925-01-09 1925-01-09 Sound-reproducing apparatus
GB32252/27A GB310759A (en) 1925-01-09 1927-11-30 Improvements relating to electro-magnetic acoustic devices

Publications (1)

Publication Number Publication Date
GB310759A true GB310759A (en) 1929-04-30

Family

ID=21696234

Family Applications (2)

Application Number Title Priority Date Filing Date
GB704/26A Expired GB245796A (en) 1925-01-09 1926-01-09 Sound-reproducing apparatus such as loud-speakers
GB32252/27A Expired GB310759A (en) 1925-01-09 1927-11-30 Improvements relating to electro-magnetic acoustic devices

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB704/26A Expired GB245796A (en) 1925-01-09 1926-01-09 Sound-reproducing apparatus such as loud-speakers

Country Status (5)

Country Link
US (1) US1707617A (en)
BE (2) BE331748A (en)
DE (1) DE548195C (en)
FR (9) FR610959A (en)
GB (2) GB245796A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8295537B2 (en) 2010-03-31 2012-10-23 Bose Corporation Loudspeaker moment and torque balancing
US8295536B2 (en) 2010-03-31 2012-10-23 Bose Corporation Moving magnet levered loudspeaker
US9055370B2 (en) 2012-08-31 2015-06-09 Bose Corporation Vibration-reducing passive radiators

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2498825A (en) * 1943-09-15 1950-02-28 Hartford Nat Bank & Trust Comp Moving coil transducer and enclosure
US2547565A (en) * 1946-09-26 1951-04-03 Wright Zimmerman Inc Speaker having a tubular pot
US6639994B1 (en) 2000-08-16 2003-10-28 Jl Audio, Inc. Loudspeaker having adjustable motor strength
FR2851115B1 (en) * 2003-02-10 2008-01-25 Patrick Hoffmann ACOUSTIC TRANSDUCER GENERATING SOUND RADIATION BY COMPRESSION AND EXPANSION OF AIR MASS SITUATED BETWEEN A MOBILE MEMBRANE AND A FIXED SURFACE OR BETWEEN TWO MOBILE MEMBRANES
CN102026067B (en) * 2011-01-12 2013-07-24 常州声泰龙电子音响有限公司 Loudspeaker and vibration part thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8295537B2 (en) 2010-03-31 2012-10-23 Bose Corporation Loudspeaker moment and torque balancing
US8295536B2 (en) 2010-03-31 2012-10-23 Bose Corporation Moving magnet levered loudspeaker
US9055370B2 (en) 2012-08-31 2015-06-09 Bose Corporation Vibration-reducing passive radiators

Also Published As

Publication number Publication date
FR46228E (en) 1936-04-02
FR36705E (en) 1930-09-03
FR43759E (en) 1934-08-29
US1707617A (en) 1929-04-02
FR35605E (en) 1930-03-26
BE356544A (en)
BE331748A (en)
FR43362E (en) 1934-05-11
FR610959A (en) 1926-08-17
DE548195C (en) 1932-04-08
FR37086E (en) 1930-10-15
FR36325E (en) 1930-05-08
FR37084E (en) 1930-10-15
GB245796A (en) 1927-04-11

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