US2002189A - Acoustic device - Google Patents

Acoustic device Download PDF

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Publication number
US2002189A
US2002189A US270683A US27068328A US2002189A US 2002189 A US2002189 A US 2002189A US 270683 A US270683 A US 270683A US 27068328 A US27068328 A US 27068328A US 2002189 A US2002189 A US 2002189A
Authority
US
United States
Prior art keywords
diaphragm
cone
supporting
conical
acoustic device
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
US270683A
Other languages
English (en)
Inventor
Round Henry Joseph
Rust Noel Meyer
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.)
RCA Corp
Original Assignee
RCA Corp
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 claimed from GB1086027A external-priority patent/GB294285A/en
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2002189A publication Critical patent/US2002189A/en
Anticipated expiration legal-status Critical
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; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • 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

Definitions

  • This invention relates to acoustic devices, and more particularly to loud speakers, microphones, gramophones and the like, of the kind provided with large area conical or similar diaphragms.
  • the conical or similar diaphragm of an acoustic device is supported upon a central shaft by means of a plurality of spiders of paper or other suitable material.
  • Figure 1 shows in front elevation one form of construction
  • Figure 2 shows a sectional side elevation of the modification shown in Figure 1
  • Figure 3 shows the small supporting spider 8 embodied in the construction shown in Figures 1 and 2.
  • l is a conical diaphragm of paper or the like, having a stiffening peripheral ring 2 at its larger end and carrying at its smaller end an annular coil 3, whereby it is impulsed.
  • the coil 3 is supplied with currents of acoustic frequency, and is adapted to project into a ring-shaped magnetic air gap 4 between concentric pole pieces 5, 6 ( Figure 2).
  • the diaphragm l is supported upon a central shaft I, by means of two paper spiders 8, 9, of different sizes.
  • the spiders 8, 9, are secured at their circumferences to the inner face of the diaphragm and are coaxially mounted upon and secured to the central shaft 1 which passes, as shown, through holes in the centres of the said spiders.
  • the shaft I is adapted to be screwed or otherwise fixed to any convenient part of the magnetic structure, for example, the pole piece 5, as shown in Figure 2, and in this way the diaphragm and supports are therefore rendered readily detachable.
  • An acoustic device comprising a conical diaphragm, operating means associated with said diaphragm, and means positioned within said diaphragm and circumferentially engaging an intermediate portion thereof for supporting said diaphragm.
  • a sound reproducer comprising a conical diaphragm, driving means associated with said conical diaphragm, and supporting means located entirely within and encompassed by said conical diaphragm, said supporting means comprising the sole support for said diaphragm.
  • a sound reproducer of the electrodynamic type comprising a conical diaphragm, a driving coil connected to said diaphragm, a magnet system for cooperating with said driving coil, said magnet system comprising pole pieces forming an annular air gap, a member secured to the central pole piece of said pole pieces and extending into said diaphragm, and a plurality of spiders positioned on said member and engaging said diaphragm.
  • a conical diaphragm and means connected to said diaphragm between the apex and the base thereof for supporting said diaphragm, said means consisting of a rod positioned within said diaphragm and at least one spider member supported by said rod and having an annular contact within said diaphragm.
  • a sound reproducer of the electro-dynamic type comprising a conical diaphragm, a driving coil connected to said diaphragm, a magnet system for co-operating with said driving coil, said magnet system comprising a central pole piece and an outer pole piece spaced therefrom, a member removably secured to said central pole piece and extending outwardly therefrom within said diaphragm and a plurality of spiders positioned on said member and engaging said diaphragm to form the sole support therefor, said member, spiders and diaphragm forming a unit adapted to be readily removed from said sound reproducer.
  • An acoustic device including a conical diaphragm, stationary supporting structure spaced from a portion of said diaphragm which is remote from its periphery, and a thin, flat, flexible member connected between said stationary supporting structure and said diaphragm, said member comprising a body having an annular portion, a portion to be connected with said stationary supporting structure, and a plurality of radial arms extending between said annular portion and the portion to be connected with the stationary structure.
  • a conical diaphragm a supporting rod extending into said diaphragm, and a pair of fiat spider members positioned on said rod for supporting said diaphragm.
  • a cone tympanum for a reproducer comprising a cone, a support for the cone near the apex end thereof, and means for supporting the cone near the base from the inside of the cone.
  • a cone tympanum for a reproducer comprising a truncated cone, a supporting member disposed along the axis of the cone, and connections from the inside of the cone at points near the apex and base ends to the centrally disposed supporting member.
  • a direct current coil a core serving as one pole of an electromagnet, a casing serving as a second pole of said magnet, the two poles being arranged to form a circular magnetic gap, a cone supporting a movable coil disposed in said gap, an extension frem said core pole piece, and a pair of flexible connections between the inside of the cone and said pole piece extension, one of said connections being near the apex end of the cone, and the other end of said connections being near the base end of the cone.
  • a projecting magnetic pole a coil surrounding said pole, a conical diaphragm attached at its apex to said coil, a flexible planiform member secured across the base of said diaphragm, allowing substantially unitary movement or" said diaphragm and a strut mounted on said pole and secured to said member.
  • a diaphragm comprising a cone, a flexible planiform member secured across the base of said cone, allowing sub stantially unitary movement of said cone, the stiffness of said member varying thereacross, and
  • a diaphragm com prising a cone, a flexible planiform member secured across the base of said cone, allowing substantially unitary movement of said cone, the stiffness of said member increasing toward the center thereof, and a support attached at the center of said member.
  • a diaphragm comprising a cone, a flexible supporting member extending across the base of said cone, allowing substantially unitary movement of said cone, and a rigid supporting member attached to said flexible supporting member adjacent its central portion, the stiffness of said flexible supporting member being greatest adjacent its attachment to said cone and said rigid supporting member.
  • An acoustic device including a conical diaphragm, a driving coil secured to said diaphragm at the apex portion thereof, stationary supporting structure spaced from a portion of said diaphragm which is remote from its periphery,
  • said means for'centering and supporting said driving coil comprising a thin, flat, flexible member connected between said stationary supporting structureand said diaphragm, said member comprising a body having an annular portion secured to said diaphragm in the vicinity of said driving coil but spaced therefrom, a portion connected to said stationary supporting structure, and a plurality of arms extending between said annular portion and the portion connected to the'stationa'ry structure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US270683A 1927-04-22 1928-04-17 Acoustic device Expired - Lifetime US2002189A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1086027A GB294285A (en) 1928-01-07 1927-04-22 Improvements in or relating to electro-acoustic devices
GB60228A GB309226A (en) 1928-01-07 1928-01-07 Improvements in or relating to acoustic devices

Publications (1)

Publication Number Publication Date
US2002189A true US2002189A (en) 1935-05-21

Family

ID=26236054

Family Applications (2)

Application Number Title Priority Date Filing Date
US270683A Expired - Lifetime US2002189A (en) 1927-04-22 1928-04-17 Acoustic device
US329467A Expired - Lifetime US2002190A (en) 1927-04-22 1928-12-31 Acoustic device

Family Applications After (1)

Application Number Title Priority Date Filing Date
US329467A Expired - Lifetime US2002190A (en) 1927-04-22 1928-12-31 Acoustic device

Country Status (4)

Country Link
US (2) US2002189A (xx)
BE (2) BE350724A (xx)
FR (2) FR653092A (xx)
NL (1) NL28724C (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513171A (en) * 1948-11-26 1950-06-27 Fauthal A Hassan Loud-speaker diaphragm with stiffening struts
US2778882A (en) * 1951-01-11 1957-01-22 Lustraphone Ltd Microphones
US4239943A (en) * 1977-11-17 1980-12-16 Cerwin Vega, Inc. Adjustable dual spider for a loudspeaker
US4373607A (en) * 1979-08-03 1983-02-15 Miller Charles D Loudspeaker cone stiffeners
US5123053A (en) * 1990-07-11 1992-06-16 Harman International Industries, Incorporated Loudspeaker suspension

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469773A (en) * 1934-06-04 1949-05-10 Jensen Mfg Company Loud-speaker diaphragm support member
US6611604B1 (en) 1999-10-22 2003-08-26 Stillwater Designs & Audio, Inc. Ultra low frequency transducer and loud speaker comprising same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513171A (en) * 1948-11-26 1950-06-27 Fauthal A Hassan Loud-speaker diaphragm with stiffening struts
US2778882A (en) * 1951-01-11 1957-01-22 Lustraphone Ltd Microphones
US4239943A (en) * 1977-11-17 1980-12-16 Cerwin Vega, Inc. Adjustable dual spider for a loudspeaker
US4373607A (en) * 1979-08-03 1983-02-15 Miller Charles D Loudspeaker cone stiffeners
US5123053A (en) * 1990-07-11 1992-06-16 Harman International Industries, Incorporated Loudspeaker suspension

Also Published As

Publication number Publication date
BE350724A (xx)
FR666922A (fr) 1929-10-08
FR653092A (fr) 1929-03-15
BE357157A (xx)
US2002190A (en) 1935-05-21
NL28724C (xx)

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