US1777271A - Electromagnetic sound reproducer - Google Patents

Electromagnetic sound reproducer Download PDF

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Publication number
US1777271A
US1777271A US284772A US28477228A US1777271A US 1777271 A US1777271 A US 1777271A US 284772 A US284772 A US 284772A US 28477228 A US28477228 A US 28477228A US 1777271 A US1777271 A US 1777271A
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US
United States
Prior art keywords
armature
electromagnetic
pole pieces
supporting
sound reproducer
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
US284772A
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English (en)
Inventor
Walter C Anderson
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 BE361147D priority Critical patent/BE361147A/xx
Application filed by BRANDES LAB Inc filed Critical BRANDES LAB Inc
Priority to US284772A priority patent/US1777271A/en
Priority to GB1317/29A priority patent/GB313484A/en
Priority to FR676035D priority patent/FR676035A/fr
Application granted granted Critical
Publication of US1777271A publication Critical patent/US1777271A/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

  • Another object of my invention is to provide means for adjusting the position of a pivoted armature between adjacent poles and with an electromagnetic actuating windin for insuring uniformity in operation of Ion speakers produced on a quantity production '29 basis.
  • Still another object of my invention is to provide a construction of loud speaker in which a carrier is provided for supporting the poles of the electromagnetic operating 2 mechanism including a pivoted armature member, with means on the carrier for adjustmg'the position of said armature member within the electromagnetic operatlng mechanism for insuring efficient operation of the sound reproducer.
  • Figure 1 is a plan view of the loud speaker showing the position of the pivoted armature between the pole pieces of the electromagnetic operating mechanism
  • Fig. 2 is a side elevation of the ioud speaker partially broken away and showing the arrangement of the pivoted armature with respect to the electromagnetic operating mechanism
  • Fig. 3 is a plan view showing the parts of the electro magnetic operating mechanism partially in cross-section
  • Fig. 4 is an elevational view through the loud speaker mechanism, with parts shown in cross-section where one of the permanent magnets has been removed to more clearly show the means for shifting the position of the armature between the pole pieces
  • Fig. 5 is an end view of the assembled elcctro magnetic operating mechanism
  • FIG. 6 is a partial cross-sectional view taken throughthe carrier which supports the electromagnetic operating mechanism
  • Fig. 7 is a perspective view of the carrier for the electromagnetic operating mechanism
  • Fig. 8 is a front view of the supporting strap which carries the sound reproducing diaphragm and link which connects with the vibratile armature member
  • Fig. 9 is a cross-sectional view tfih rough the supporting strap illustrated in My invention is directed to a construction of electromagnetic sound reproducer which has been found to be extremely practical and is capable of production on a quantity scale at minimum expense where substantially uniform characteristics may be obtained in large numbers of loud speakers on an extensive production scale.
  • I provide a die casting forming a unitary sup port for both the electromagnetic windings and the armature, where the die casting is so shaped that the support which carries the armature and electromagnetic operating mechanism is angularly shiftable permitting an adjustment after the assembly of the loud speaker mechanism for precisely centering the armature in the air gap between the pole pieces.
  • reference characters 1 and 2 designate permanent magnets forming part of the assembly of the electromagnetic sound reproducer.
  • the permanent magnets are secured on opposite sides of pairs of inwardly directed pole pieces represented at and 6 by means of bolt members 3 and 4 passing through the assembled ma nets and pole pieces.
  • the pole p1eces 5 am 6 have tapered pole faces 7 and 8 directed toward each other and spaced apart by a gap in which is positioned the rockable armature 30.
  • the assembly of the parts of the sound reproducer is mounted upon a suitable supporting chassis by means of angle members which .I have indicated at 9 and 10 as secured to the bolt members 3 and 4 which pass through the permanent magnets and through the sets of pole pieces.
  • the die casting which forms the unitary support for the )arts of the electromagnetic operatin mechanism is shown in perspective View in ig. 7 comprising a longitudinally extendin bar member 12 supported beneath the poTe pieces 5 and 6 by means of screw members 16 and 17.
  • the longitudinally extending bar member 12 is provided with latera ally extending portions 14 and 15, each of which is cut away in steps as represented at 21 and have terminating surfaces and 11.
  • the surface 20 terminates below the plane of the surface 11 and is substantially curved as illustrated in the drawings.
  • the electromagnetic operating mechanism includes bobbins 27 and 31 which have laterally extend ing end flanges 26 and 24, respectively, which are secured on opposite sides of a resilient plate member which forms the mounting means for the armature Within the gap between the pole faces 7 and 8 and within the bobbins 27 and 31. Bv virtue of the re; silient pro erties of the plate 25 the armature 30 is Free to vibrate within the bobbins 27 and 31 with the supporting plate 25 as a pivot or center of rocking motion.
  • the ends of the bobbins at 26 and 24 together with the intermediate resilient plate 25 are secured upon the die casting by means of screws 28 which pass into the laterally extending portion 14 and through the face 11 thereof for anchoring the electromagnetic operating mechanism in position.
  • a metallic spacer block 23 is interposed between the opposite ends of plates 24 25, 26.and the curved surface 2(). Screw members 29 pass through the parallel plates 24, 25, 26 and into the later ally extending portion 15. of the die casting for securing the electromagnetic operating.
  • the armature 30 extends between the pole'faces; 7
  • the curved surface 20 affords means for effecting a rocking movement of block 23 by adjusting the end of screws 29 to shift the armature 7 in the exact central position between the pole faces 7 and 8.
  • lock washers 28 and 29 I provide a mounting strip 18 secured by suitable means 19 to one end of the die casting 12, which strip provides a support for the apex piece 32 which is secured to the conical shaped sound reproducing diaphragm 331
  • a connecting rod 34 extends between the apex piece 32 and the upper end of the armature 30 for transferring vibrations from the armature to the sound reproducing diaphragm.
  • the mounting of the parts of the electromagnetic operating mechanism on the die casting 12 greatly simplifies assembly of the loud speaker.
  • the cntawav portions 21 of the die casting permit the electromagnet 31 to project into the die casting and provides a compact assembly.
  • the pole pieces 5 and 6 are cut away as represented at 35 and 35 so that the pole faces 7 and 8 embrace the electromagnetic windings on opposite sides and provide gaps within which the armature 30 may be vibrated.
  • the amount of actual shift of the armature 30 is generally extremely small but the surface 20 is so shaped that sufficient angular displacement of the armature may be made after assembly of the Hm by Letters Patent of the limited States is as follows:
  • a loud speaker comprising an electromagnetic driving system including a pair of pole pieces, an armature member, a plate mounted in said driving system and sup- 1 porting said armature member, a curved surfor rocking said plate on said curved surface for centering said armature member between said pair of pole pieces.
  • a loud speaker comprising pole pieces directed toward each other, an armature member.
  • polepieces extending between said magnets and directed toward each other, a casting secured between said magnets and supporting an electromagnetic system thereon, an armature member disposed within said electromagnetic system, a plate member extending laterally on said casting and between said magnets, said casting being curved on its supporting surface and means passing through said plate member and through said casting for angularly shifting the position of said armature and centering' said armature between said pole pieces.
  • a loud speaker comprising pole pieces directed toward each other, an electromagnetic system, an armature supporting mem- A ber positionin said armature between said pole pieces and extending normal to the axis of said electromagnetic system, a foundation member, said foundation member having a curved upper surface carrying said armature supporting member, and screw means extending through said supporting member and into said foundation member for selectively rocking said armature supporting member to a position for centering said armature between. said polepieces.
  • Inaloud speaker system a pail-of pole pieces directed toward-each other, an armature memln-nr, located between said pole pieces, a foundation plate member-having a curved top surface, an electromagnetic sys-v tem, supporting means carrying said electromagnetic s stem, and screw means passing through said supporting means for adjustably mounting said supporting means on said ioundation plate member.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US284772A 1928-06-12 1928-06-12 Electromagnetic sound reproducer Expired - Lifetime US1777271A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE361147D BE361147A (enrdf_load_stackoverflow) 1928-06-12
US284772A US1777271A (en) 1928-06-12 1928-06-12 Electromagnetic sound reproducer
GB1317/29A GB313484A (en) 1928-06-12 1929-01-14 Electromagnetic sound reproducer
FR676035D FR676035A (fr) 1928-06-12 1929-06-01 Reproducteur électromagnétique du son

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US284772A US1777271A (en) 1928-06-12 1928-06-12 Electromagnetic sound reproducer

Publications (1)

Publication Number Publication Date
US1777271A true US1777271A (en) 1930-09-30

Family

ID=23091470

Family Applications (1)

Application Number Title Priority Date Filing Date
US284772A Expired - Lifetime US1777271A (en) 1928-06-12 1928-06-12 Electromagnetic sound reproducer

Country Status (4)

Country Link
US (1) US1777271A (enrdf_load_stackoverflow)
BE (1) BE361147A (enrdf_load_stackoverflow)
FR (1) FR676035A (enrdf_load_stackoverflow)
GB (1) GB313484A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
GB313484A (en) 1930-01-30
BE361147A (enrdf_load_stackoverflow)
FR676035A (fr) 1930-02-18

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