US1914191A - Electric sound reproducing apparatus - Google Patents

Electric sound reproducing apparatus Download PDF

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Publication number
US1914191A
US1914191A US549949A US54994931A US1914191A US 1914191 A US1914191 A US 1914191A US 549949 A US549949 A US 549949A US 54994931 A US54994931 A US 54994931A US 1914191 A US1914191 A US 1914191A
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US
United States
Prior art keywords
armature
pole pieces
resilient
resilient member
extending
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
US549949A
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English (en)
Inventor
Leonard B Ault
Thomas F Robinson
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
Application filed by General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US1914191A publication Critical patent/US1914191A/en
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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
    • H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/16—Mounting or connecting stylus to transducer with or without damping means

Definitions

  • the present invention relates to electric sound reproducing apparatus and particularly to the kind of apparatus known as an electrical pick-up in which a stylus vibrated in accordance with the contour of a record of sound waves causes fluctuating electric currents to be produced which are adapted, after suitable amplification, to operate sound producing apparatus.
  • apparatus may be used forthe recording of sound by energizing the apparatus with electric currents corresponding to sound waves and causing the corresponding movement of the stylus to form an impression on a record blank.
  • the invention is an improvement in or modification of the apparatus disclosed in the application for U. S. Letters Patent, Serial No. 271,813, filed April 21, 1926, James W. Kendall. J
  • an electric sound pick-up device having an armature pivotally mounted between the abutting ends of a pair of magnetic pole pieces and having a portion extending at right angles to the pivotal axis thereof,
  • portion 1s adaptedto engage at its end a resilient member subjected to substantially no compressive or frictional force, the resilient member being also mounted upon the pole pieces;
  • the purpose of the resilient member was to assist in centering the armature with respect to the pole pieces without providing any substantial additional damping other than that already applied in the pivotal mounting of the armature between the pole pieces.
  • the present invention is concerned with an improved construction of resilient memher and mounting of the same whereby the resilient member is caused to engage the end of the armature.
  • the resilient member is in the form of a rod or tube of resilient material adapted to engage the end of the armature in such a manner that upon movement of the same a bending movement about its axis is produced in the resilient member as opposed to the compressional stress caused in the resilient member owing to the construction employed in the apparatus disclosed in the above adjustable for the purpose of varying the stress produced in the resilient member by the movement of the armature, whereby the restoring force of the armature may be adjusted.
  • Fig. 1 is an elevation of the improved arrangement according to the invention and Fig. 2 is an exploded View to show more clearly the construction of the armature and of the resilient member.
  • a permanent magnet of horse-shoe shape provided with bipartite pole pieces2 which are arranged to support and partly enclose a coil 8 interposed between the upper and lower extensions of the pole pieces 2-, which extensions cooperate to provide upper and lower air gaps.
  • the armature 4 Passing through the axis of the coil 3 and located in the air gaps is thearmature 4 provided with a transverse shaft 5 which forms the pivotal axis of the armature, the shaft 5 being situated in the air gap formed between the recesses in the lower extensions of the pole pieces 2 where they abut against each other.
  • Resilient-material (not shown) is suitably interposed silient member 8 the air gap formed between the upper cooperating extensions of the pole pieces 2, which are rounded at 7 to receive the armature.
  • the upper end 6 of the armature is thus free to move in the air gap formed between the upper extensions of the pole pieces and is largely centered by resilient material surrounding the shaft 5 being gripped between the lower cooperating extensions of the pole pieces.
  • a resilient member 8 subjected to substantially no initial compressive or'frictional force other than that necessitated by its means of attachment and comprising a rod of resilient material such as rubber which engages the recessed end 6 of the armature, and is held by the screWel clamping member 9 supported by the bridging member 10 fixed to pillars 11 attached to the pole pieces 2.
  • the member 9 has tongued ends which form, in cooperation with the nut 12, a chuck permitting the reto be gripped and held with its upper end stationary.
  • the length of the resilientmember 8 available between the end of the nut 12 and the armature can be ad justed and consequently the restoring force applied to the armature varied.
  • the end of the rod may be secured in a plane tubular clamping member by pressing the clamping member around the resilient rod after its insertion therein.
  • the mounting means above described for resilient rod 8 are so arranged that the 1111- supported portion 15 of this resilient rod extends freely and relatively loosely between the clamping member 9 and the end 6 of the armature and that movement of the armature 4 from its normal position causes a bending movement about its axis to be applied to the resilient member 8 as distinct from the compressive stress involved with the arrangement disclosed in the above-cited application, Serial No. 271,813.
  • the rod 8 may be replaced by a tube or tubelike member of resilient material adapted to fit over the end 6 of the armature with an equivalent result.
  • a sound producer including a pair of pole pieces, an armature mounted to vibrate between said pole pieces, a supporting member, a resilient member having an unsupported portion, the opposite ends of said resilient member being connected respectively rigidly to said supporting member and slidably to an end of said armature in such a manner that said unsupported portion of said resilient member extends between said supporting member and said end of said armature.
  • a sound producer including a pair of pole pieces, an armature mounted to vibrate between said pole pieces, ber, a resilient member extending at right angles to the axis of vibration of said armature from an end of said armature and having an unsupported portion extending between said supporting member and said end of said armature, the opposite ends of said resilient member being connected respectively rigidly to said supporting member and relatively loosely to said end of said armature in such a manner that said unsupported portion of said resilient member is subjected to substantially no compressive or frictional force when said armature is in its mean position with respect to said pole pieces.
  • a sound producer including a pair of pole pieces, an armature mounted to vibrate between said pole pieces, a supporting member, a resilient member having an unsupported portion, the opposite ends of said resilient member being connected respectively rigidly to said supporting member and slidably to an end of said armature, and adjustable means to vary the length of said unsupported portion of said resilient member.
  • a sound reproducer including a pair of pole pieces, an armature pivotally mounted between said pole pieces and having a portion extending at right angles to the pivotal axis of said armature, a relatively long and narrow member of resilient material attached slidably at one end thereof to said extending portion of said armature, said member being so arranged that on movement of said armature about said pivotal axis said member is subjected to a bending stress.
  • a sound reproducer including a pair of pole pieces, an armature pivotally a supporting memected to substantially no compressive or frictional force other than that required for its attachment to said armature and pole pieces when the armature is in the mean position with respect to said pole pieces.
  • a sound reproducer including a pair of pole pieces, an armature pivotally mounted between said pole pieces and having a portion extending at right angles to the pivotal axis of said armature, a member of resilient material, means to attach said extending portion of said armature to said resilient member at one extremity thereof, said resilient member extending substantially in the direction of the axis of said extending portion of said armature, means to attach said resilient member at its other extremity to said pole pieces, said last-named means being so arranged that the length of the free portion of said resilient member extending between said armature and said means for attaching said member to said pole pieces is adjustable.
  • a sound reproducer including a pair of pole pieces, an armature pivotally mounted between said pole pieces and having a portion extending at right angles to the pivotal axis of said armature, a member of resilient material, means to attach said resilient member at one end thereof to said extending portion of said armature at the other end thereof to said pole pieces, sald member extending substantially in the direction of the axis of said extending portion of said armature, said attachment means for said resilient member being so arranged that the free portion of said member between said ends thereof is adjustable.
  • a sound producer including a pair of pole pieces, an armature mounted to vibrate between said pole pieces, stiffening means for said armature, a supporting member, said stiffening means including a relatively long and narrow member of resilient material connected slidably at one end thereof to said armature and at the other end rigidly to said supporting member, said resilient member being subjected only to bending stress on vibration of said armature.
  • a sound producer including a pair of pole pieces, an armature pivotally mounted between said pole pieces and adapted to vibrate therebetween, a supporting member,
  • stilfening means for said armature including a body of resilient material connected slidably at one end thereof to a portion of said armature relatively distant from the pivotal axis thereof, said body being connected rigidly atthe other end thereof to said supporting member, said body being subjected only to bending stress on vibration of said armature, and adjustable means to vary the stiffening effect of said means.
  • a sound producer including a pair of pole'pieces, an armature pivotally mounted between said pole pieces and adapted to vibrate therebetween, stiffening means for said armature including abody of resilient material connected to an end of said armature relatively distant from the pivotal axis thereof, said body of resilient materialhavsaid end of said armature, andadjustable means to vary the length of said unsupport-- ed portion.
  • a sound reproducer includng a pair of pole pieces, an armature pivotally mounted between said pole pieces and having a portion extending at right angles to the pivotal axis of said armature, a member of resilient material, means to attach said extending portion of said armature to said resilient member at one extremity thereof, said resilient member extending substantially in the direction of the axis of said extending portion of said armature, means to attach rigidly said resilient member at its other extremity to said pole pieces, said last-named means being so arranged that the length of the free portion of said resilient member extending between said armature and said means for attaching said member to said pole pieces is adjustable.
  • a sound reproducer including a pair of pole pieces, an armature pivotally mounted between said pole pieces and having a portion extending at right angles to the pivotal axis of said armature, a member of resilient material, means to attach said resilient member at one end thereof to said extending portion of said armature and at the other end thereof rigidly to said pole pieces, said member extending substantially in the direction of the axis of said extending portion of said armature, said attachment means for said resilient member being so arranged that the free portion of said member between said ends thereof is adjustable.
  • a sound producer including a pair of pole pieces, an armature mounted to vibratebetween said pole pieces, a supporting member, stiffening means for said armature including a body of resilient-material extending in a direction substantially coaxial with said armature, said body being attached at one end thereof to said armature and at the other end rigidly to said supporting member, said body having an unsupported poring an unsupported portionextending from member,
  • tion adapted to be subjected only to a bending stress on movement of said armature, and adjustable means to Vary the length of said unsupported portion.
  • a sound producer including a pair of pole pieces, an armature pivotally mounted between said pole pieces and adapted to vibrate therebetween, a supporting member, stiffening means for said armature including a body of resilient material connected at one end thereof to an end of said armature relatively distant from the pivotal axis thereof, said body being connected rigidly at the other end thereof to said supporting said body of resilient material having an unsupported portion extending in a direction substantially coaxial with said armature from said end of said armature and adapted to be subjected only to a bending stress on movement of said armature, and adjustable means to vary the length of said unsupported portion.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Mounting Of Printed Circuit Boards And The Like (AREA)
  • Casings For Electric Apparatus (AREA)
  • Vibration Prevention Devices (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US549949A 1931-02-17 1931-07-10 Electric sound reproducing apparatus Expired - Lifetime US1914191A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB5020/31A GB373158A (en) 1931-02-17 1931-02-17 Improvements relating to apparatus for the electrical reproduction of sound
GB24278/31A GB379100A (en) 1931-02-17 1931-08-28 Improvements relating to apparatus for the electrical reproduction of sound

Publications (1)

Publication Number Publication Date
US1914191A true US1914191A (en) 1933-06-13

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ID=26239533

Family Applications (1)

Application Number Title Priority Date Filing Date
US549949A Expired - Lifetime US1914191A (en) 1931-02-17 1931-07-10 Electric sound reproducing apparatus

Country Status (5)

Country Link
US (1) US1914191A (enrdf_load_stackoverflow)
BE (1) BE386486A (enrdf_load_stackoverflow)
DE (1) DE617320C (enrdf_load_stackoverflow)
FR (1) FR731491A (enrdf_load_stackoverflow)
GB (2) GB373158A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2581511A (en) * 1947-12-31 1952-01-08 Donald J Baker Magnetic phonograph pickup

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2581511A (en) * 1947-12-31 1952-01-08 Donald J Baker Magnetic phonograph pickup

Also Published As

Publication number Publication date
GB379100A (en) 1932-08-25
DE617320C (de) 1935-08-16
FR731491A (fr) 1932-09-03
GB373158A (en) 1932-05-17
BE386486A (enrdf_load_stackoverflow) 1932-03-31

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