GB469286A - Improvements in or relating to loud speakers - Google Patents

Improvements in or relating to loud speakers

Info

Publication number
GB469286A
GB469286A GB23644/36A GB2364436A GB469286A GB 469286 A GB469286 A GB 469286A GB 23644/36 A GB23644/36 A GB 23644/36A GB 2364436 A GB2364436 A GB 2364436A GB 469286 A GB469286 A GB 469286A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
horn
apertures
magnet system
adjacent
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
GB23644/36A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB469286A publication Critical patent/GB469286A/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
    • 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

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

469,286. Loud-speakers. STANDARD TELEPHONES & CABLES, Ltd. Aug. 28, 1936, No. 23644. Convention date, Feb. 29. [Class 40 (iv)] A loud-speaker comprises a large diaphragm and a small diaphragm operated by a magnet system and a horn with its throat adjacent the smaller diaphragm and its mouth adjacent the central portion of the large diaphragm which is provided with apertures for the passage of sound waves from the smaller diaphragm. The magnet system for the larger diaphragm 20 comprises a channelled ring 14 of magnetic material to which a polepiece 13 is secured to form an air gap 19 in which an edge-wound coil 32 is located. The diaphragm has a central dome-shaped portion 21, a flat annular portion 22 which is clamped to the polepiece 13, and an intermediate arched portion 23 which is formed with apertures 29 and slots 30 covered on both sides by strips 31 of rubber. A circular portion of the diaphragm 20 adjacent the mouth of the horn 43 is formed with apertures 27 covered by a screen 28 of silk or metallic gauze. The magnet system for the smaller diaphragm 47 is supported by arms 57 and comprises magnetic members 36, 37 forming a gap 41 for a coil 56 attached to the diaphragm 47 at the junction between its domed central portion and an annular flange by which it is attached to the member 36. The space beneath the diaphragm 47 is connected to the throat of the horn by passages 55 in a plug member 54.
GB23644/36A 1936-02-29 1936-08-28 Improvements in or relating to loud speakers Expired GB469286A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US66400A US2107757A (en) 1936-02-29 1936-02-29 Acoustic device

Publications (1)

Publication Number Publication Date
GB469286A true GB469286A (en) 1937-07-22

Family

ID=22069276

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23644/36A Expired GB469286A (en) 1936-02-29 1936-08-28 Improvements in or relating to loud speakers

Country Status (2)

Country Link
US (1) US2107757A (en)
GB (1) GB469286A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250658A (en) * 1990-12-07 1992-06-10 Canon Res Ct Europe Ltd Loudspeaker
EP0782370A3 (en) * 1995-12-14 2006-05-24 Murata Manufacturing Co., Ltd. Speaker for radiating sound waves in all directions relative to a speaker-supporting surface

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2440439A (en) * 1942-07-04 1948-04-27 Permoflux Corp Permanent magnet electrodynamic transducer
US2907837A (en) * 1956-09-18 1959-10-06 Brami Joseph Sound reproducing system
US3026958A (en) * 1957-11-25 1962-03-27 Hawley Products Co Acoustical diaphragm
US3032138A (en) * 1957-11-25 1962-05-01 Hawley Products Co Acoustical devices
US3093711A (en) * 1961-01-25 1963-06-11 Frank A Comerci Testing microphones
DE1165668B (en) * 1961-06-19 1964-03-19 Deutsche Post Rundfunk Sound absorption arrangement for loudspeaker groups
GB1048602A (en) * 1964-01-30 1966-11-16 Emi Ltd Improvements relating to moving coil loudspeakers and the like
US3852529A (en) * 1973-01-10 1974-12-03 Motorola Inc Acoustic horn
JPS547783Y2 (en) * 1977-01-29 1979-04-11
US4310065A (en) * 1979-05-11 1982-01-12 Chromalloy Electronics Corporation Radial horn
GB2055012B (en) * 1979-06-30 1984-01-04 Pioneer Electronic Corp Coaxial planar diaphragm loudspeaker system
US4619342A (en) * 1979-07-16 1986-10-28 Cerwin-Vega, Inc. Multiple sound transducer system utilizing an acoustic filter to reduce distortion
US4718517A (en) * 1986-02-27 1988-01-12 Electro-Voice, Inc. Loudspeaker and acoustic transformer therefor
AU6176394A (en) * 1993-02-25 1994-09-14 Ralph D. Heinz Multiple-driver single horn loudspeaker
US6411718B1 (en) 1999-04-28 2002-06-25 Sound Physics Labs, Inc. Sound reproduction employing unity summation aperture loudspeakers
US7392880B2 (en) * 2002-04-02 2008-07-01 Gibson Guitar Corp. Dual range horn with acoustic crossover
JP5759641B1 (en) * 2014-10-24 2015-08-05 太陽誘電株式会社 Electroacoustic transducer and electronic device
US9686615B2 (en) * 2014-10-24 2017-06-20 Taiyo Yuden Co., Ltd. Electroacoustic converter and electronic device
US11290795B2 (en) * 2019-05-17 2022-03-29 Bose Corporation Coaxial loudspeakers with perforated waveguide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250658A (en) * 1990-12-07 1992-06-10 Canon Res Ct Europe Ltd Loudspeaker
EP0782370A3 (en) * 1995-12-14 2006-05-24 Murata Manufacturing Co., Ltd. Speaker for radiating sound waves in all directions relative to a speaker-supporting surface

Also Published As

Publication number Publication date
US2107757A (en) 1938-02-08

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