US2617894A - Electrodynamic recording device - Google Patents

Electrodynamic recording device Download PDF

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Publication number
US2617894A
US2617894A US1624A US162448A US2617894A US 2617894 A US2617894 A US 2617894A US 1624 A US1624 A US 1624A US 162448 A US162448 A US 162448A US 2617894 A US2617894 A US 2617894A
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US
United States
Prior art keywords
air gaps
recording device
oscillatory system
vertical
horizontal air
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
US1624A
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English (en)
Inventor
Arentzen Holger Christian
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US2617894A publication Critical patent/US2617894A/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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/12—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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits
    • 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
    • H04R9/12—Gramophone pick-ups using a stylus; Recorders using a stylus
    • H04R9/16—Gramophone pick-ups using a stylus; Recorders using a stylus signals recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

Definitions

  • a primary magnetic circuit defining two vertical air gaps
  • a secondary magnetic circuit defining two horizontal air gaps
  • an oscillatory system adapted to support a stylus and including a driving coil disposed in the vertical air gaps, a feedback coil disposed in the horizontal air gaps, and means for providing a substantially horizontal pivotal axis for said oscillatory system intermediate said vertical and horizontal air gaps.
  • a magnetic circuit defining two vertical and two horizontal air gaps, an oscillatory system including a stylus and a driving coil disposed to extend in said vertical air gaps, a feedback coil disposed in said horizontal air gaps, and means forming a substantially horizontal pivotal axis, said pivotal axis substantially coinciding with the center of gravity of said oscillatory system.
  • An electrodynamic recording device comprising a magnetic structure including two vertical and two horizontal air gaps, an oscillatory system including a stylus and holder therefor, a driving coil disposed on said holder and in said vertical air gaps and a feedback coil disposed on said holder and in said horizontal air gaps, a member supporting said oscillatory system in said magnetic structure and comprising a conical body provided with a, pair of grooves extending through said body and defining a resilient strip between two conical portions of said body, and fastening means at either end of said conical body to facilitate connection of said holder with said conical body and of said conical body with said magnetic structure, respectively.
  • an electrodynamic recordingdevice a magnetic structure, an oscillatory system including spaced apart vertical and horizontal air gaps, and supporting means for said oscillatory system and including a holder for a stylus, said supporting means comprising a conical body, said body being provided with two conical discs connected with each other by a relatively short resilient strip therebetween, and fastening means at either end of said conical body to facilitate connection of the latter to said magnetic structure and to said stylus holder, respectively, said resilient strip being disposed at a location between said vertical and horizontal air gaps.
  • an electrodynamic recording device a magnetic structure, an oscillatory system, and supporting means for said oscillatory system, said supporting means comprising a conical body, a
  • An electrodynamic recording device comprising a housing, a magnet within said housing, a first pair of pole pieces, an annular core of ferromagnetic material intermediate said first pair of pole pieces so arranged as to form two substantially vertical airgaps between said pole pieces and said core, a second pair of pole pieces and an annular body of ferromagnetic material so arranged as to form two substantially horizontal air gaps between said second pair of pole pieces and said annular body, an oscillatory system comprising a driving coil disposed in the vertical air gaps and a driven coil disposed in the horizontal air gaps, a holder member for said coils, a support extending into said member and affixed with one end therein and with the other end to a portion of said housing, said support comprising a resilient strip adapted to provide a substantially horizontal pivotal axis for said oscillatory system and being disposed at a level intermediate the levels at which said driving and driven coils are arranged, said strip forming a spring leaf which is substantially stiff and inflexible in all directions except against
  • An electro-dynamic recording device comprising a ferromagnetic core member including a cylindrical portion having a longitudinal'axis, a pair of primary magnetic pole pieces of opposite polarity disposed at opposite sides of said core member and defining two substantially vertical air gaps lengthwise of said core member between it and said primary pole pieces, a pair of secondary magnetic pole pieces axially spaced from said primary magnetic pole pieces and terminating in substantially flat pole faces positioned adjacent said longitudinal axis, a ferromagnetic bridging member having surface portions facing said flat pole faces of said secondary pole pieces so as to define two substantially horizontal air gaps between said surface portions of said bridging member and said flat pole faces, and an oscillatory system mounted for pivotal movement about an axis extending between said primary and secondary pole pieces and perpendicularly to said longitudinal axis, said oscillatory system being adapted to carry a stylus, a driving coil surrounding said cylindrical portion of said core member so as to extend through said substantially vertical air gaps on both sides of said core member, and a feedback coil located in said substantially horizontal
  • An electromagnetic recording device having an axis; comprising magnetic circuit means defining two substantially vertical air gaps in symmetrical positions with respect to a vertical plane and disposed in series in the magnetic path, and further defining two substantially horizontal air gaps in similar symmetrical positions with respect to said axis, said horizontal air gaps being axially spaced from said vertical air gaps and being likewise disposed in series in the magnetic path, and an oscillatory system mounted for pivotal move ment about a horizontal axis in said plane of symmetry and intermediate of said vertical and horizontalv air gaps, said oscillatory system including a stylus, a driving coil arranged to extend within said substantially vertical air gaps, and a feedback. coil arranged to extend within said substantially horizontal air gaps.
  • an electrodynamic recording device a magnetic structure including spaced apart vertical and horizontal air gaps, an oscillatory system including a holder for a stylus, and supporting means for said oscillatory system comprising two conical disks connected with each other by a resilient strip therebetween, and fastening means at either end of said supporting means to facilitate connection of the latter to said magnetic structure an d to siaid stylus holder, respectively,

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
US1624A 1947-01-11 1948-01-10 Electrodynamic recording device Expired - Lifetime US2617894A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK646180X 1947-01-11

Publications (1)

Publication Number Publication Date
US2617894A true US2617894A (en) 1952-11-11

Family

ID=8151990

Family Applications (1)

Application Number Title Priority Date Filing Date
US1624A Expired - Lifetime US2617894A (en) 1947-01-11 1948-01-10 Electrodynamic recording device

Country Status (4)

Country Link
US (1) US2617894A (en(2012))
DE (1) DE823799C (en(2012))
GB (1) GB646180A (en(2012))
NL (1) NL75135C (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3133161A (en) * 1960-01-30 1964-05-12 Neumann Georg Electro-mechanical transducer with negative feedback for the recording and reproduction of sound waves

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1535538A (en) * 1923-01-03 1925-04-28 Western Electric Co Vibratory system
US1803273A (en) * 1929-07-25 1931-04-28 Cleveland Trust Co Phonograph pick-up
US1833070A (en) * 1929-04-15 1931-11-24 Conner Crouse Corp Electromechanical translating device
US1995177A (en) * 1932-12-10 1935-03-19 Rca Corp Electromagnetic pick up device
US2155469A (en) * 1936-05-29 1939-04-25 Rca Corp Signal translating apparatus
US2161489A (en) * 1937-10-07 1939-06-06 Bell Telephone Labor Inc Vibratory system
US2386089A (en) * 1944-03-31 1945-10-02 Philco Radio & Television Corp Phonograph pickup device
US2406597A (en) * 1944-09-07 1946-08-27 Gen Electric Electric pickup
US2410329A (en) * 1944-09-08 1946-10-29 Philco Corp Electrical apparatus
US2461190A (en) * 1945-08-04 1949-02-08 Eastman Kodak Co Adjustable mount for optical elements

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1535538A (en) * 1923-01-03 1925-04-28 Western Electric Co Vibratory system
US1833070A (en) * 1929-04-15 1931-11-24 Conner Crouse Corp Electromechanical translating device
US1803273A (en) * 1929-07-25 1931-04-28 Cleveland Trust Co Phonograph pick-up
US1995177A (en) * 1932-12-10 1935-03-19 Rca Corp Electromagnetic pick up device
US2155469A (en) * 1936-05-29 1939-04-25 Rca Corp Signal translating apparatus
US2161489A (en) * 1937-10-07 1939-06-06 Bell Telephone Labor Inc Vibratory system
US2386089A (en) * 1944-03-31 1945-10-02 Philco Radio & Television Corp Phonograph pickup device
US2406597A (en) * 1944-09-07 1946-08-27 Gen Electric Electric pickup
US2410329A (en) * 1944-09-08 1946-10-29 Philco Corp Electrical apparatus
US2461190A (en) * 1945-08-04 1949-02-08 Eastman Kodak Co Adjustable mount for optical elements

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3133161A (en) * 1960-01-30 1964-05-12 Neumann Georg Electro-mechanical transducer with negative feedback for the recording and reproduction of sound waves

Also Published As

Publication number Publication date
DE823799C (de) 1951-12-06
GB646180A (en) 1950-11-15
NL75135C (en(2012))

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