GB214787A - Improvements in or relating to telephone receivers - Google Patents

Improvements in or relating to telephone receivers

Info

Publication number
GB214787A
GB214787A GB640023A GB640023A GB214787A GB 214787 A GB214787 A GB 214787A GB 640023 A GB640023 A GB 640023A GB 640023 A GB640023 A GB 640023A GB 214787 A GB214787 A GB 214787A
Authority
GB
United Kingdom
Prior art keywords
casing
core
soft iron
fixed
pole
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
GB640023A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB640023A priority Critical patent/GB214787A/en
Publication of GB214787A publication Critical patent/GB214787A/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
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
    • H04R13/02—Telephone receivers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

214,787. Dungey, J. W. March 6, 1923. Magnetic instruments.-In a telephone receiver in which the casing is of magnetized metal and encloses a core and coil winding, the casing A constitutes the sole permanent magnet and a core X or cores of soft iron is directly attached and fixed to the casing, the coil winding C being detained in a fixed position relative to the casing. The ends of the coil are led to insulated terminals F on the casing. The core X may be formed of soft iron wires; or it may be tubular and a central core Z be screw-threaded within the core for adjustment by means of an external nut or lever. The casing may be magnetized with one pole all round the rim against which the diaphragm is clamped and the other pole in the centre to which the soft iron core is fixed.
GB640023A 1923-03-06 1923-03-06 Improvements in or relating to telephone receivers Expired GB214787A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB640023A GB214787A (en) 1923-03-06 1923-03-06 Improvements in or relating to telephone receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB640023A GB214787A (en) 1923-03-06 1923-03-06 Improvements in or relating to telephone receivers

Publications (1)

Publication Number Publication Date
GB214787A true GB214787A (en) 1924-05-01

Family

ID=9813812

Family Applications (1)

Application Number Title Priority Date Filing Date
GB640023A Expired GB214787A (en) 1923-03-06 1923-03-06 Improvements in or relating to telephone receivers

Country Status (1)

Country Link
GB (1) GB214787A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419697A (en) * 1943-11-19 1947-04-29 Hettie Dent Electromagnetic telephone receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419697A (en) * 1943-11-19 1947-04-29 Hettie Dent Electromagnetic telephone receiver

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