GB646180A - Improvements in electrodynamic recording devices - Google Patents

Improvements in electrodynamic recording devices

Info

Publication number
GB646180A
GB646180A GB790/48A GB79048A GB646180A GB 646180 A GB646180 A GB 646180A GB 790/48 A GB790/48 A GB 790/48A GB 79048 A GB79048 A GB 79048A GB 646180 A GB646180 A GB 646180A
Authority
GB
United Kingdom
Prior art keywords
coil
polepieces
jan
coils
vertical
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
Application number
GB790/48A
Other languages
English (en)
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.)
ELECTRICAL FONO FILMS CO AS
Original Assignee
ELECTRICAL FONO FILMS CO AS
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 ELECTRICAL FONO FILMS CO AS filed Critical ELECTRICAL FONO FILMS CO AS
Publication of GB646180A publication Critical patent/GB646180A/en
Expired legal-status Critical Current

Links

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

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)
GB790/48A 1947-01-11 1948-01-09 Improvements in electrodynamic recording devices Expired GB646180A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB646180A true GB646180A (en) 1950-11-15

Family

ID=8151990

Family Applications (1)

Application Number Title Priority Date Filing Date
GB790/48A Expired GB646180A (en) 1947-01-11 1948-01-09 Improvements in electrodynamic recording devices

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)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1134527B (de) * 1960-01-30 1962-08-09 Georg Neumann Elektromechanischer Wandler mit Gegenkopplung zur Aufzeichnung und Wiedergabe von Schallschwingungen in Einkomponentenschrift

Family Cites Families (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
NL61306C (en, 2012) * 1937-10-07
US2386089A (en) * 1944-03-31 1945-10-02 Philco Radio & Television Corp Phonograph pickup device
BE473326A (en, 2012) * 1944-09-07
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

Also Published As

Publication number Publication date
US2617894A (en) 1952-11-11
DE823799C (de) 1951-12-06
NL75135C (en, 2012)

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