GB203974A - Improvements in or relating to electromagnetic receivers - Google Patents

Improvements in or relating to electromagnetic receivers

Info

Publication number
GB203974A
GB203974A GB3463822A GB3463822A GB203974A GB 203974 A GB203974 A GB 203974A GB 3463822 A GB3463822 A GB 3463822A GB 3463822 A GB3463822 A GB 3463822A GB 203974 A GB203974 A GB 203974A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
pole
disc
moved
relating
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
GB3463822A
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.)
SIDNEY REYNEL SMITH
Automatic Telephone Manufacturing Co Ltd
Original Assignee
SIDNEY REYNEL SMITH
Automatic Telephone Manufacturing Co Ltd
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 SIDNEY REYNEL SMITH, Automatic Telephone Manufacturing Co Ltd filed Critical SIDNEY REYNEL SMITH
Priority to GB3463822A priority Critical patent/GB203974A/en
Publication of GB203974A publication Critical patent/GB203974A/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)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

203,974. Automatic Telephone Manufacturing Co., Ltd., and Smith, S. R. Dec. 19, 1922. Magnetic instruments. - An electromagnetic telephone receiver is adjusted by means of a disc 11 of magnetic material which is adapted to be moved in an axial direction nearer to or further from the pole-pieces on the opposite side of the coils to the diaphragm. The permanent magnet 5 is provided with pole-shoes 6, which carry the exciting coils 7 and are fixed to an insulating block 8. The disc 11 is moved within a central hole in the block 8 by means of a screw 12 with a milled head 13, and is held in any position by a spring 14. A coarse adjustment is provided in the form of paper rings which may be fitted between the diaphragm 4 and the case 3 containing the magnet system.
GB3463822A 1922-12-19 1922-12-19 Improvements in or relating to electromagnetic receivers Expired GB203974A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3463822A GB203974A (en) 1922-12-19 1922-12-19 Improvements in or relating to electromagnetic receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3463822A GB203974A (en) 1922-12-19 1922-12-19 Improvements in or relating to electromagnetic receivers

Publications (1)

Publication Number Publication Date
GB203974A true GB203974A (en) 1923-09-20

Family

ID=10368126

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3463822A Expired GB203974A (en) 1922-12-19 1922-12-19 Improvements in or relating to electromagnetic receivers

Country Status (1)

Country Link
GB (1) GB203974A (en)

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