US2371951A - Double diaphragm loud-speaker - Google Patents

Double diaphragm loud-speaker Download PDF

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Publication number
US2371951A
US2371951A US471576A US47157643A US2371951A US 2371951 A US2371951 A US 2371951A US 471576 A US471576 A US 471576A US 47157643 A US47157643 A US 47157643A US 2371951 A US2371951 A US 2371951A
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US
United States
Prior art keywords
diaphragm
cone
range
diameter
voice coil
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
US471576A
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English (en)
Inventor
Ellsworth D Cook
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.)
General Electric Co
Original Assignee
General Electric Co
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 BE479149D priority Critical patent/BE479149A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US471576A priority patent/US2371951A/en
Application granted granted Critical
Publication of US2371951A publication Critical patent/US2371951A/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
    • H04R7/02—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

Definitions

  • My invention relates to acoustic devices of'the dynamic type for transmitting signals over both low and high' ranges'of frequencies, particularly to loudspeaker or like devices employing two diaphragms of different size and characteristic for respectively transmitting a low and a high frequency range, and itsprinclpal object is to provide an improved acoustic device ofthe two-diara typ It is well known from experience with developments in the acoustic prior art involving various forms of'dia'phragms, particularly the large diameter cone diaphragms employed in dynamic loudspeakers, that it is diflicult practically, even if not impossible theoretically, so to construct a single diaphragm that it may be forced satisfactorily to-operate over an extremely extended frequency range, such a range for example as one comprising both the high frequency portion and the low frequency portion of the voice range.
  • the loads imposed arepractically prohibitive at high frequencies if it be attempted so to construct the large diameter diaphragm structure which is capable of moving integrally as a piston at low frequencies and especially adapted to transmission of these low frequencies, that it will also be capable of transmitting the high frequencies while moving as a piston.
  • acterlstic of my invention are set forth with parthat of conventionalforms. and an inverted diaphragm of-general cone shape and of approximately' the diameter of the voice coil i rigidly attached thereto.
  • a relatively large diameter cone diaphragm which is of usual form is also connected to the voice coil, but the connection to this large diaphragm is through an elastic coupling.
  • the mass of the cone structure comprising the large diaphragm, and theela'sticity of its coupling to the-voice coil, are so proportioned and arranged that the vibratory mechanical system constituted by the large cone structure is adjusted to respond to the vibratory energy supplied by the voice coil over only the desired low frequency portion of the voice range.
  • the above noted diillculties are overcome and the above noted and other objects attained by the provision of a double diaphragm device of special arrangement, but which in appearance is not extremely dissimilar to the conventional form of cone diaphragm loudspeaker.
  • the diameter of the operating winding or voice coil vided with suitable suspension means comprising a usual flexible ring H which may be secured to a fixed frame element (not shown).
  • a second diaphragm I2 is provided which is of substantially less diameter than that of the diaphragm III, of the order of one-half, for example, and which is mounted in inverted relation with. the latter diaphragm at the smaller end thereof.
  • the diaphragm i2 is fitted like a cap adjacent the outer side of a voice coil'l3 and extending within the larger diaphragm.
  • the diaphragm I2 is of a general cone shape, but while it may be a cone as illustrated, it may also be of somewhat differentinverted positioning of the smaller diaphragm it, whatever be its exact form, resides in the fact that the inverted diaphragm spreads the for the diaphragm is increased somewhat over high frequencies overs somewhat wider solid angle than would be obtained with the conventional placing of a cone diaphragm.
  • the smaller diaphragm I2 is so mounted as to be driven or vibrated directly by the voice coil as by securing the edge it of the latter diaphragm rigidly to the outer end I! of the coil support H.
  • the larger diaphragm Ill is not arranged to be driven or vibrated directly by the voice coil it but through an elastic coupling.
  • the coil I3 and diaphragm ID are preferably operatively associated with each other by means of an elastance elemental) which may be in the form of a ring of pliant material, the sides II and 22 of which are secured respectively to the voice coil support I and to the smaller edge 23 of the diaphragm III, and which comprises a fold of Sylphon bellowsiike form 24.
  • the inner coreor pole piece I! of the magnet system may be provided with an extension piece N of larger diameter, and the central opening in the outer pole piece l8 may be of correspondingly larger diameter to provide the required larger diameter air gap ll.
  • the mass of the low frequency system including the larger cone Ilia prevented from becoming a load on the voice coil II .when the acoustic device is operating on the high frequency portion of the voice range.
  • This mass it will be noted,would become a load on the voice coil if the mass were vibrated over the entire frequency range of the device, and would necessitate either a driving system of much higher power at the high frequencies or might even under the above assumption refuse to vibrate in the as of the order for example of one-half that of of diaphragm Ill.
  • the diameter of diaphragm I! while not especially critical should be such in any case that this diaphragm may have sufficient total radiation resistance to radiate the full amountof high frequency energy required. Otherwise stated, it
  • a truncated cone-shaped diaphragm of relatively large diameter for transmitting a relatively low range offrequencies an operatin winding approximately one-half the larger diameter of said diaphragm, said cone-shaped diaphragm having' a smaller diameter approximately one-half its larger diameter, an inverted diaphragm of approximately the same diameter as said winding connected thereto for transmitting a maximum amount of energy at a relatively high range of frequencies, and a bellows-like elastance element connecting said winding.
  • said first-named diaphragm for preventing the mass of said first-named diaphragm from loading said winding at said high frequency range.
  • said element being constructed and arranged to transmit substantially all the low frequency energy passing from said winding'to said first diaphragm along paths parallel to the central axis of said first diaphragm.

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  • 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)
US471576A 1943-01-07 1943-01-07 Double diaphragm loud-speaker Expired - Lifetime US2371951A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE479149D BE479149A (enrdf_load_stackoverflow) 1943-01-07
US471576A US2371951A (en) 1943-01-07 1943-01-07 Double diaphragm loud-speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US471576A US2371951A (en) 1943-01-07 1943-01-07 Double diaphragm loud-speaker

Publications (1)

Publication Number Publication Date
US2371951A true US2371951A (en) 1945-03-20

Family

ID=23872155

Family Applications (1)

Application Number Title Priority Date Filing Date
US471576A Expired - Lifetime US2371951A (en) 1943-01-07 1943-01-07 Double diaphragm loud-speaker

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US (1) US2371951A (enrdf_load_stackoverflow)
BE (1) BE479149A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565069A (en) * 1946-03-30 1951-08-21 Rola Company Inc Loud-speaker of the double diaphragm type
US2568883A (en) * 1947-03-24 1951-09-25 Altec Lansing Corp Loud-speaker with expanding horn unit
US2590439A (en) * 1948-05-12 1952-03-25 Star Electronics Inc Push-pull resistance type phonograph pickup
US2775653A (en) * 1950-11-16 1956-12-25 Holmberg & Co Moving coil diaphragms for electrodynamic listening apparatus
US3236958A (en) * 1961-04-25 1966-02-22 Electronic Res Associates Inc Loudspeaker system
US3350513A (en) * 1964-06-22 1967-10-31 Alfred H Roberts Cone loudspeakers
FR2595497A1 (fr) * 1986-03-05 1987-09-11 Plastmetal Sa Haut-parleur dynamique pour alarmes
EP0232760A3 (en) * 1986-02-05 1988-10-12 Pfleid-Wohnraumakustik Gmbh Broad band loudspeaker provided with a membrane surface divided into a plurality of parts corresponding to a plurality of frequency bands
USD943551S1 (en) * 2019-05-23 2022-02-15 Tymphany Acoustic Technology (Huizhou) Co., Ltd. Diaphragm for loudspeaker
US11553272B2 (en) 2020-09-30 2023-01-10 Paradigm Electronics Inc. Loudspeaker with mechanical resonance mitigation

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565069A (en) * 1946-03-30 1951-08-21 Rola Company Inc Loud-speaker of the double diaphragm type
US2568883A (en) * 1947-03-24 1951-09-25 Altec Lansing Corp Loud-speaker with expanding horn unit
US2590439A (en) * 1948-05-12 1952-03-25 Star Electronics Inc Push-pull resistance type phonograph pickup
US2775653A (en) * 1950-11-16 1956-12-25 Holmberg & Co Moving coil diaphragms for electrodynamic listening apparatus
US3236958A (en) * 1961-04-25 1966-02-22 Electronic Res Associates Inc Loudspeaker system
US3350513A (en) * 1964-06-22 1967-10-31 Alfred H Roberts Cone loudspeakers
EP0232760A3 (en) * 1986-02-05 1988-10-12 Pfleid-Wohnraumakustik Gmbh Broad band loudspeaker provided with a membrane surface divided into a plurality of parts corresponding to a plurality of frequency bands
FR2595497A1 (fr) * 1986-03-05 1987-09-11 Plastmetal Sa Haut-parleur dynamique pour alarmes
USD943551S1 (en) * 2019-05-23 2022-02-15 Tymphany Acoustic Technology (Huizhou) Co., Ltd. Diaphragm for loudspeaker
US11553272B2 (en) 2020-09-30 2023-01-10 Paradigm Electronics Inc. Loudspeaker with mechanical resonance mitigation

Also Published As

Publication number Publication date
BE479149A (enrdf_load_stackoverflow)

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