US1588545A - Electromagnetic driver - Google Patents

Electromagnetic driver Download PDF

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Publication number
US1588545A
US1588545A US71990A US7199025A US1588545A US 1588545 A US1588545 A US 1588545A US 71990 A US71990 A US 71990A US 7199025 A US7199025 A US 7199025A US 1588545 A US1588545 A US 1588545A
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US
United States
Prior art keywords
armature
electromagnetic
sound
band
circular
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
US71990A
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English (en)
Inventor
William H Gerns
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.)
BRANDES LAB Inc
BRANDES LABORATORIES Inc
Original Assignee
BRANDES LAB 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
Priority to NL20311D priority Critical patent/NL20311C/xx
Application filed by BRANDES LAB Inc filed Critical BRANDES LAB Inc
Priority to US71990A priority patent/US1588545A/en
Priority to GB11387/26A priority patent/GB257203A/en
Application granted granted Critical
Publication of US1588545A publication Critical patent/US1588545A/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
    • H04R11/00—Transducers of moving-armature or moving-core type

Definitions

  • My invention relates broadly to the reproduction of sound from electrical vibrations and more particularly to the construction of an electromagnetic driver for sound re- 6 producers.
  • Another object of my invention is to provide a construction of armature for an electromagnetic driver of the double magnetic type where the armature provides means for positively spacing the electromagnetic systems one from another and has the necessary resiliencyimparted thereto by reason of its characteristic-shape with means for taking off the mechanical vibrations from v the armature for driving a sound reproducinn; diaphragm.
  • Still anothe object of my invention is to provide a construction of armature for a double magnetic type of electromagnetic 7 sound reproducer, in which the armature formed from a flat plate of magnetic mate rial armatured in the shape of plurality of sectors vand a semi-circle for imparting a desired degree of resiliency to the armature and providing a proper distribution of magnetic lines therethrough.
  • a further object of my invention is to provide a construction of armature.
  • the armature may be stamped from a fiat sheet of magnetic material with a diametrica-l bridge member, which is subjected to the vibratory action of the electromagnetic system and a radial portion of which is shaped to provide means for deliver-inflthe vibrations thus produced upon a sound reproducing diaphragm.
  • FIG. 1 is an end view, showing the arrangement of parts of the electromagnetic driver;
  • Fi 2 is a cross-sectional view taken throu h tile double magnetic electromagnetie river;
  • Fig. 3 is a cross-sectional view through the driver taken on line 3-3of Fig.
  • Permanent magnets 4 and 5 are mounted adjacent each of the casings l and 2 and have sets of pole pieces 6 and 7 secured thereto.
  • the pole pieces 6 and 7 are provided with electromagnetic windings 8 and 9. by which magnetic forces are imparted to thearinature 10. Alternate attractive and repulsive forces may-be applied to the armature 10, thereby increasing the amplitude of movement of the armature and correspondingly the volume of the reproduced sound.
  • the armature construction forms the particular feature of my invention.
  • the armature is punched from a fiat sheet of magnetic material in such manner asv to provide apertures 3% adjacent the circum-, l ercncc thereof, by which the armature is maintained in position by bolt members 3 and serves as a and 2.
  • the armature 10 is apertured i a plurality of segments, represented at 11 and 12 and in a semi-circular portion. rep're sented at "14.
  • the segments 11 and 12 are substantially quadrant and are positioned on opposite sides of a radial bridge-like portion 15.
  • the segmental apertures 11 and 12 lie "adjacent the semi-circular aperture 14 on opposite sides of the diametrical portion 16., which forms the principal area.
  • tions may be impressed upon a sound reproducing diaphragm with a high degree of efficiency.
  • the construction of the armature in the manner illustrated facilitates manufacture reproducer.
  • an electromagnetic driver a sound reproducing diaphragm, a pair of electromagnetic driving units positioned oppos te each other, an armature positioned between said electromagnetic driving units, said armaturecomprising a Hat sheet of magnetic material apertured in a plurality of segments, one of which circular, .a band extending between each of said segments, one of said bands being d rectly actuated by attractive and repulsive electromagnetic driving units andthe other of said bands being arranged to deliver mechanical vibrations from said armature to said sound reproducing diaphragm.
  • a sound reproducing diaphragm a circular armature member positioned between said drivers, and having a diametrically extending'band across the center thereof arranged to be actuated by attractive and repulsive- )rces from said pole pieces, and a bridgemember disposed between said band, and one side of said circular armature member, e'lwrebv mechanical forces set up in said 21 on the bridge member 15 is such that mechanical v braof the electromagnetic sound
  • the electromagnetic dr ving unit lends itself particularly well as an actu the double is substantially semitending radially ing pole pieces directed toward each other, 7
  • a sound reproducing diapl'iragm a circular arn'iatnre member positioned between said drivers, said circulararmature member comprising a: flat sheet-of magnetic vmaterial apertured in a plurality of segments, with each of said segments separated by bands of relatively different widths, said armature member being arranged to receive mechanical vibrations along' one of saidbands and transfer mechanical vibrations to said sound reproducing diaphragm along another band.
  • I i r 4 in.
  • an electroi'nagnetic soundreproducer the combination of a pair of independentelectromagnetic drivers each having pole pieoes directed toward each other, a sound reprbducing diaphragm, a circular armature member positioned between said drivers, said circular armature member being npertured to form a )air of band members directed at right ang es to each other, with one of said band members extending diametrically across said circular armature member and the other of saidband members extending radially across said circular armature member from said first-mentioned band member, whereby re ulsive and attractive forces set up in said first mentioned band member may be conveyed to said second mentioned band member for actuating said sound reproducing ,diaphragm.
  • a sound reproducing diaphragm a circular armature member positioned between said drivers, said circular armature member being formed into a pair of integral band portions, one disposed at right angles to the other, one of said band members being actuated by said electromagnetic drivers, and the other of said band members being mechanically vibrated from said first mentioned band member.
  • the coinbinationcf a pair ofindependent electromagnetic drivers each having pole pieces directed toward each other, a sound reproducing diaphragm, a circaiar armature member positioned between said drivers,-said circular armature member having a pair of strip like portions disposed at right angles to-cach other, one of said strip like portions being actuated by said electromagnetic drivers, and the other of said strip like portions being arranged to impart mechanical vibrations to said sound'freproducing diaphragm.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Reciprocating Pumps (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US71990A 1925-11-28 1925-11-28 Electromagnetic driver Expired - Lifetime US1588545A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL20311D NL20311C (enrdf_load_stackoverflow) 1925-11-28
US71990A US1588545A (en) 1925-11-28 1925-11-28 Electromagnetic driver
GB11387/26A GB257203A (en) 1925-11-28 1926-04-30 Improvements relating to electromagnetic sound reproducing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US71990A US1588545A (en) 1925-11-28 1925-11-28 Electromagnetic driver

Publications (1)

Publication Number Publication Date
US1588545A true US1588545A (en) 1926-06-15

Family

ID=22104871

Family Applications (1)

Application Number Title Priority Date Filing Date
US71990A Expired - Lifetime US1588545A (en) 1925-11-28 1925-11-28 Electromagnetic driver

Country Status (3)

Country Link
US (1) US1588545A (enrdf_load_stackoverflow)
GB (1) GB257203A (enrdf_load_stackoverflow)
NL (1) NL20311C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
NL20311C (enrdf_load_stackoverflow)
GB257203A (en) 1926-08-26

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