US2071828A - Loudspeaker, sound reproducing instrument, and the like - Google Patents

Loudspeaker, sound reproducing instrument, and the like Download PDF

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Publication number
US2071828A
US2071828A US748474A US74847434A US2071828A US 2071828 A US2071828 A US 2071828A US 748474 A US748474 A US 748474A US 74847434 A US74847434 A US 74847434A US 2071828 A US2071828 A US 2071828A
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US
United States
Prior art keywords
cone
diaphragm
cones
loudspeaker
sound reproducing
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 - Lifetime
Application number
US748474A
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English (en)
Inventor
Glen Robert Rodger
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.)
GLEN S PATENTS AND HOLDINGS IN
GLEN'S PATENTS AND HOLDINGS Inc
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GLEN S PATENTS AND HOLDINGS IN
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Filing date
Publication date
Application filed by GLEN S PATENTS AND HOLDINGS IN filed Critical GLEN S PATENTS AND HOLDINGS IN
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Publication of US2071828A publication Critical patent/US2071828A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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

Definitions

  • This invention relates to improvements in loud speakers, sound reproducing instruments, and the like, which are of the kind having a ,diaphragrn that is vibrated by an electrical driving unit.
  • the object of the invention is generally to improve the tone quality of such instruments.
  • a loud speaker or the like is provided with a pair m of diaphragms, one of which is driven by a driving unit, while the second diaphragm is spaced away from the first diaphragm and unconnected thereto, but is driven from the first solely by the vibration and/or compression of the air in the space between the two diaphragms.
  • the pair of diaphrag'ms may be either of the same diameter or of different diameters, the
  • Fig. 1 is a sectional elevation of a loud speaker according to the invention with the casing and auxiliary parts removed; and 30 Fig. 2 is an enlarged sectional elevation of the apices of the cones.
  • the loud speaker shown has a permanent magnet ll) of known form with .an
  • a driven cone l8 shown as considerably larger than the driving cone I3, is secured to a suitable supporting ring IQ, for example, one of 45 aluminum, that is carried on a spider 20, which in turn engages the permanent magnet Ill through a base ring 2
  • a suitable supporting ring IQ for example, one of 45 aluminum, that is carried on a spider 20, which in turn engages the permanent magnet Ill through a base ring 2
  • cones may be of any suitable material, for example, the smaller cone may be of spun aluminum, while the larger cone may be of papier mache impregnated or dressed with a suitable stiffening or loading substance, such as a mixture comprising fish glue, bitumen, pumice, gypsum, or the like.
  • a suitable stiffening or loading substance such as a mixture comprising fish glue, bitumen, pumice, gypsum, or the like.
  • the actuating force is transmitted from the driving cone I3 to the driven cone I8 solely by way of acoustic vibrations in the intervening air gap.
  • the air gap is proportioned to produce this effect to substantially a maximum extent, as it is found that by this arrangement the penetration of the sound emitted is greatly increased and intensified, efiective reproduction over a relatively wide range of frequencies being thereby obtained, while at the same time the volume of sound produced is not diminished as compared with loud speakers of known construction.
  • the cone I8 is considerably larger than the cone Hi, In one embodiment, that has been found successful, the diameter of the cone I8 is about 14% inches and the diameter of the cone I3 is from 4 to 6 inches. The distance between the two cones, measured normal to their surfaces, is 3/64ths of an inch.
  • cones of relatively small angles may be used. Also, it will be understood that, while a coaxial arrangement of the cones has certain advantages, this is not a necessary arrangement, nor is the spacing of the cones necessarily uniform or confined to one employing parallel cones; a degree of divergence from the parallel arrangement may be employed so long as the second cone is driven by the first through air vibrations.
  • the driving unit of the loud speaker forms no part of the present invention; any suitable unit may be employed to this end.
  • the invention may be applied to any purpose to which loud speakers are usually put, such as radio reception and reproduction of gramophone records, but has particular application to acoustical apparatus for public address systems, for places of public concourse, entertainment, and the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US748474A 1934-06-19 1934-10-16 Loudspeaker, sound reproducing instrument, and the like Expired - Lifetime US2071828A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18184/34A GB440041A (en) 1934-06-19 1934-06-19 Improvements in or relating to loud-speakers and the like

Publications (1)

Publication Number Publication Date
US2071828A true US2071828A (en) 1937-02-23

Family

ID=10108101

Family Applications (1)

Application Number Title Priority Date Filing Date
US748474A Expired - Lifetime US2071828A (en) 1934-06-19 1934-10-16 Loudspeaker, sound reproducing instrument, and the like

Country Status (3)

Country Link
US (1) US2071828A (fr)
FR (1) FR791384A (fr)
GB (1) GB440041A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2840178A (en) * 1954-01-20 1958-06-24 Tesla Np Device for the reproduction of sound
US4159472A (en) * 1976-07-13 1979-06-26 Kabushiki Kaisha Daini Seikosha Electronic buzzer
US4508941A (en) * 1981-11-27 1985-04-02 Community Light & Sound Inc. Voice coil centering and suspension for vented pole piece
US5323469A (en) * 1991-07-31 1994-06-21 Nokia (Deutschland) Gmbh Conical loudspeaker having a conical stabilizing element joined between an underside of a speaker membrane and an outside surface of a speaker moving coil carrier
US6496590B2 (en) 2000-12-08 2002-12-17 Jl Audio, Inc. Loudspeaker with improved diaphragm
US6963652B1 (en) 2003-04-18 2005-11-08 James M Colombo Low frequency generator
US20100092023A1 (en) * 2007-01-12 2010-04-15 Samson Technologies Corporation Speaker motor and speaker
USD864913S1 (en) * 2017-08-08 2019-10-29 Pioneer Corporation Speaker for automobile

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2840178A (en) * 1954-01-20 1958-06-24 Tesla Np Device for the reproduction of sound
US4159472A (en) * 1976-07-13 1979-06-26 Kabushiki Kaisha Daini Seikosha Electronic buzzer
US4508941A (en) * 1981-11-27 1985-04-02 Community Light & Sound Inc. Voice coil centering and suspension for vented pole piece
US5323469A (en) * 1991-07-31 1994-06-21 Nokia (Deutschland) Gmbh Conical loudspeaker having a conical stabilizing element joined between an underside of a speaker membrane and an outside surface of a speaker moving coil carrier
US6496590B2 (en) 2000-12-08 2002-12-17 Jl Audio, Inc. Loudspeaker with improved diaphragm
US6963652B1 (en) 2003-04-18 2005-11-08 James M Colombo Low frequency generator
US20100092023A1 (en) * 2007-01-12 2010-04-15 Samson Technologies Corporation Speaker motor and speaker
US8175321B2 (en) 2007-01-12 2012-05-08 Samson Technologies Corporation Speaker motor and speaker
USD864913S1 (en) * 2017-08-08 2019-10-29 Pioneer Corporation Speaker for automobile

Also Published As

Publication number Publication date
GB440041A (en) 1935-12-19
FR791384A (fr) 1935-12-10

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