US1893049A - Sound producing device - Google Patents

Sound producing device Download PDF

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Publication number
US1893049A
US1893049A US631039A US63103932A US1893049A US 1893049 A US1893049 A US 1893049A US 631039 A US631039 A US 631039A US 63103932 A US63103932 A US 63103932A US 1893049 A US1893049 A US 1893049A
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United States
Prior art keywords
disc
coil
diaphragm
centering
washer
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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
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US631039A
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English (en)
Inventor
Clayton M Boudette
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Individual
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Individual
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Filing date
Publication date
Priority to BE407715D priority Critical patent/BE407715A/xx
Application filed by Individual filed Critical Individual
Priority to US631039A priority patent/US1893049A/en
Application granted granted Critical
Publication of US1893049A publication Critical patent/US1893049A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H04R9/041—Centering

Definitions

  • This invention involves a novel coil-supporting means which, while permitting free 35 longitudinal movement of the voice current coil in the air gap, accurately centers said coil and prevents any transverse movement thereof, thereby eliminating all danger of contact between said coil and the magnet ele- 29 ments.
  • This improved centering device a much narrower air gap can be used than is possible with the coil-centering means heretofore employed and the diaphragm and voice coil are permanently and accurately centered and aligned with respect to the magnetic system.
  • the preferred form of centering device is a washer of thin flexible non-hydroscopic material such as celluloid, qmetal, bakelite, non- 30 porous paper and the like which may be provided with corrugations, either concentric or spiral, or of any other suitable configuration to increase the flexibility thereof longitudinally without unduly reducing the lateral stiffness of the same.
  • the voice-coil supporting-cylinder preferably projects through the central aperture of the centering washer and is cemented to the latter and the apex portion of the diaphragm, if the latter be of the conical type, with the result that the washer acts as a diaphragm-supporting means, as well as a means for centering and aligning the voice coil and diaphragm with respect to the magnetic structure.
  • FIG. 1 is a plan view of a coil-centering washer embodying the present invention
  • Fig. 2 is a section taken on the line 22 of Fig. 1;
  • Fig. 3 is a plan view of another form of centering washer
  • Fig. 4 is a section taken on the line 4-4 of Fig. 2;
  • Fig. 5 is a longitudinal central section of a radio loud speaker provided with the coilcentering diaphragm-supporting washer shown in Fig. 1.
  • 10 is a washer formed of thin flexible non-porous material, such for example, as celluloid and provided with concentric corrugations 11 between the peripheral portion 12 and the cen tral aperture 13.
  • the corrugated portion of the apertured disc or washer between the support for the peripheral portion thereof and said central aperture must have such radial to length as will permit of sufficient longitudinal movement of said disc and the parts thereto attached to effect the faithful reproduction of low notes.
  • the ratio of the diameter of the free or vibrating portion of the disc, i. e., the portion thereof within the inner periphery of said support, to the diameter of said central aperture is 2% to 1, approximately, and the ratio of the radial length of the corrugated portion of said disc to the thickness of the disc is approximately 250 to 1.
  • the radial length of the corrugated portion of the disc is dependent, other things being equal, upon the thickness of the disc, and further, that such radial length for a given range of vibration and given thickness of disc is dependent upon the size and. weight of the cone. For; example, if the thickness of the disc be reduced, the radial length of the corrugated portion thereof also may be diminished, and if the size or weight of the cone be augmented, such radial length may be reduced, and vice versa.
  • the corrugations conveniently may be formed by heating the longitudinal flexibility and lateral stiflness.
  • Fig. 3 the disc is provided with concentric corrugations 14. It will be understood that as the purpose of the corrugations is to increase the flexibility of the washer longitudinally without unduly reducing the lateral stiffness thereof, such corrugations may be of any sha e or configuration that will effect the desi 'result.
  • the electromagnet 15 is provided with a core 16 and pole-piece 17, apertured to receive said core.
  • the voicecurrent coil 18 is wound on the coil-supporting cylinder 19 and is disposed in the air gap between the core and pole-piece.
  • the outer flange 20 of the diaphragm 21, herein shown as a cone, is flexibly supported by the flange 22 of the pan 23 secured to the magnet structure by bolts 24.
  • the lower portion of said pan forms an annular support 25 for the outer peripheral portion of the centering washer which preferably is cemented to said annular support.
  • a thin coating of cement is placed on the coil-supporting cylinder and the latter is then passed through the apex portion of the cone in order to secure these two elements together.
  • the central aperture of the centering washer may be provided w1th a flange 26 inorder to facilitate the cementmg of said washer to the coil-supporting cylinder, which preferably is secured both to the diaphragm and washer. It will be understood of course that this invention is not limited to the particular means disclosed for securing the aforesaid elements together, inasmuch as many alternative means will readily occur to those skilled in the art for accomplishing this purpose.
  • centering washer of the character described herein permits the permanent and accurate centering and aligning of the diaphragm and voice coil with respect to the magnet structure and makes possible a substantial reduction in the radial length of the air gap.
  • the flexibility of the centering washer eflected by the corrugations is such that the voice coil has free and unimpeded movement longitudinally with respect to the air gap while lateral stiffness thereof is not reduced sufficiently to permit any transverse movement of said coil in said gap.
  • a sound-producing device comprising in combination, a cone diaphragm flexibly supported at its base, an actuating coil secured to said diaphragm, a corrugated imperforate coil-centering diaphragm-supporting llt) thereof without unduly reducing the lateral stiffness of the same.
  • a sound-producing device comprising in combination, a cone diaphragm flexibly supported at its base, an actuating coil secured to said diaphragm, a coil-centering diaphragm-supporting disc of thin flexible ma- Lerial provided with concentric corrugations and a support for the peripheral portion of said disc, the corrugated portion of said disc having-sufficient radial length to permit of free longitudinal movement thereof withou unduly reducing the lateral stifl'ness of the same.
  • a sound-producing device com rising in combination, a cone diaphragm exibly supported at its base, an actuating coil secured to said diaphragm, a coil-centering diaphragm-supportlng disc of thin flexible material provided with spiral corrugations, and. a support for the peripheral ortionof said disc, the corrugated portion 0 said disc having sufficient radial length to permit of free longitudinal movement thereof without unduly reducing the lateral stiffness of the same.
  • a corrugated imperforate coil-centering diaphra supporting disc of thin flexible non-hydi' scopic material and a support for the peripheral portion of said disc, the corrugated ment thereof without unduly reducing the lateral stiflness of the same.
  • a sound-producing device com rising in combination, a cone diaphragm flexibly supported at its base, a magnet having a core and a pole-piece, a coil support, an actuating coil carried by said support, said coii bein disposed in the air gap pole-piece and c said core an ort being se cured to said diaphragm, a thin corrugated disc for centering said coil, said disc being of thin flexible material and having a central aperture for receiving said coil support, and a support for the peripheral ortion of said disc, the corrugated portion 0 said disc having suflicient radial length to permit of free longitudinal movement thereof without unduly reducing the lateral stiffness of the same.
  • a sound-producing device com rising in combination, a cone diaphragm exibly supported at its base, a coil support, an actuating coil carried by said support, a corrugated coil-centering disc formed of thin flexible material and provided with a central aperture, a support for the outer peripheral portion of said disc, said coil support passmg through said aperture and being secured to said diaphragm and to said disc, and a magnet having a core and a pole-piece, said coil being disposed in the air-gap between said core and pole-piece and the corrugated portion of said disc having sufiicient radial length to permit of free longitudinal movement thereof without unduly reducing the lateral stiffness of the same.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US631039A 1932-08-30 1932-08-30 Sound producing device Expired - Lifetime US1893049A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE407715D BE407715A (enrdf_load_stackoverflow) 1932-08-30
US631039A US1893049A (en) 1932-08-30 1932-08-30 Sound producing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US631039A US1893049A (en) 1932-08-30 1932-08-30 Sound producing device

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US1893049A true US1893049A (en) 1933-01-03

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US631039A Expired - Lifetime US1893049A (en) 1932-08-30 1932-08-30 Sound producing device

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BE (1) BE407715A (enrdf_load_stackoverflow)

Cited By (4)

* 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
US3247925A (en) * 1962-03-08 1966-04-26 Lord Corp Loudspeaker
US4926486A (en) * 1987-07-17 1990-05-15 Barsumian Bruce R Transducer assembly for automatic message system
US6904154B2 (en) 1995-09-02 2005-06-07 New Transducers Limited Acoustic device

Cited By (8)

* 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
US3247925A (en) * 1962-03-08 1966-04-26 Lord Corp Loudspeaker
US4926486A (en) * 1987-07-17 1990-05-15 Barsumian Bruce R Transducer assembly for automatic message system
US6904154B2 (en) 1995-09-02 2005-06-07 New Transducers Limited Acoustic device
US20050147273A1 (en) * 1995-09-02 2005-07-07 New Transducers Limited Acoustic device
US20060159293A1 (en) * 1995-09-02 2006-07-20 New Transducers Limited Acoustic device
US7158647B2 (en) 1995-09-02 2007-01-02 New Transducers Limited Acoustic device
US7194098B2 (en) 1995-09-02 2007-03-20 New Transducers Limited Acoustic device

Also Published As

Publication number Publication date
BE407715A (enrdf_load_stackoverflow)

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