GB275571A - Acoustic devices, such as loud speakers - Google Patents

Acoustic devices, such as loud speakers

Info

Publication number
GB275571A
GB275571A GB15795/27A GB1579527A GB275571A GB 275571 A GB275571 A GB 275571A GB 15795/27 A GB15795/27 A GB 15795/27A GB 1579527 A GB1579527 A GB 1579527A GB 275571 A GB275571 A GB 275571A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
sound
plug
passages
secured
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
GB15795/27A
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.)
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22427925&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=GB275571(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Electrical Research Products Inc filed Critical Electrical Research Products Inc
Publication of GB275571A publication Critical patent/GB275571A/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 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
    • 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
    • H04R7/127—Non-planar diaphragms or cones dome-shaped
    • 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

Landscapes

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

Abstract

275,571. Electrical Research Products, Inc., (Assignees of Wente, E. C.). Aug. 4, 1926, [Convention date]. Loud-speakers; magnetic instruments; diaphragms. - An acoustic device, such as a loudspeaker, comprises a sound chamber, a diaphragm therefor and a plug in the chamber, a substantial portion of the diaphragm being stiffened so as to vibrate as a piston and the base of the plug being in close face to face relation with the stiffened portion of the diaphragm but less closely spaced at its periphery near the sound outlet passage. The diaphragm, plug and chamber are preferably so shaped and arranged that converging sound passages are formed leading from the centre of the diaphragm and from its peripheral portion, respectively, to a common sound passage. The cross sectional areas of these converging sound passages increase as the common sound passage is approached and are such that substantially equal volume displacements occur in each of these passages in response to the displacement of the diaphragm. In the construction of loud-speaker shown, a metallic plug 23 in the form of a spherical sector is secured by lugs 24 and screws 25 in a housing 20, which is suitably shaped internally, the radius of the plug being slightly smaller than that of the dish-shaped central portion 17 of the diaphragm. The outer portion of the diaphragm is formed with a corrugated portion 18 and flat portion 19, which is clamped between the housing 20 and the portion 15 of the electromagnetic structure. The converging sound passages from the central and peripheral portions of the diaphragm respectively meet the common sound passage at the throat of the exponentially tapered horn 26. A coil 14 is secured to the periphery of the stiff central portion 17 of the diaphragm by means of a strip 30 of stiffened fabric material or thin light-weight metal. The ends of the coil 14 are positioned along corrugations in the flexible portion 18 of the diaphragm and secured to screws 31, 32 electrically connected to terminals 33, 34. The electromagnet comprises a hollow annular core 10, winding 11 and annular pole pieces 12, 13, the top portion 15 being detachable to permit assembling of the winding 11 on the core structure. The space at the mid-portion of the core 10 is closed at each end by wire gauze members 27, 28 and a sound absorbing material 29. Specification 275,567 is referred to.
GB15795/27A 1926-08-04 1927-06-14 Acoustic devices, such as loud speakers Expired GB275571A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US127023A US1707545A (en) 1926-08-04 1926-08-04 Acoustic device

Publications (1)

Publication Number Publication Date
GB275571A true GB275571A (en) 1928-07-12

Family

ID=22427925

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15795/27A Expired GB275571A (en) 1926-08-04 1927-06-14 Acoustic devices, such as loud speakers

Country Status (6)

Country Link
US (1) US1707545A (en)
BE (1) BE344484A (en)
DE (1) DE540540C (en)
FR (1) FR636818A (en)
GB (1) GB275571A (en)
NL (1) NL22539C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6950530B2 (en) 2002-01-31 2005-09-27 Martin Audio Limited Directional loudspeaker unit

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE968466C (en) * 1952-02-23 1958-02-20 Siemens Ag Pressure chamber loudspeaker, especially with a dome membrane
US4157741A (en) * 1978-08-16 1979-06-12 Goldwater Alan J Phase plug
US4310065A (en) * 1979-05-11 1982-01-12 Chromalloy Electronics Corporation Radial horn
US4718517A (en) * 1986-02-27 1988-01-12 Electro-Voice, Inc. Loudspeaker and acoustic transformer therefor
US4882562A (en) * 1986-03-11 1989-11-21 Turbosound Limited Adaptor for coupling plural compression drivers to a common horn
US20060034475A1 (en) * 2004-08-16 2006-02-16 Geddes Earl R Compression driver plug
KR101192910B1 (en) 2008-08-14 2012-10-18 하만인터내셔날인더스트리스인코포레이티드 Phase plug and acoustic lens for direct radiating loudspeaker
FR2955445B1 (en) 2010-01-15 2013-06-07 Phl Audio ELECTRODYNAMIC TRANSDUCER WITH DOME AND INTERNAL SUSPENSION
FR2955446B1 (en) 2010-01-15 2015-06-05 Phl Audio ELECTRODYNAMIC TRANSDUCER WITH DOME AND FLOATING SUSPENSION
FR2955444B1 (en) 2010-01-15 2012-08-03 Phl Audio COAXIAL SPEAKER SYSTEM WITH COMPRESSION CHAMBER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6950530B2 (en) 2002-01-31 2005-09-27 Martin Audio Limited Directional loudspeaker unit

Also Published As

Publication number Publication date
DE540540C (en) 1932-01-09
BE344484A (en)
NL22539C (en)
US1707545A (en) 1929-04-02
FR636818A (en) 1928-04-17

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