GB677226A - Improvements in or relating to electro-acoustic transducers - Google Patents

Improvements in or relating to electro-acoustic transducers

Info

Publication number
GB677226A
GB677226A GB1620447A GB1620447A GB677226A GB 677226 A GB677226 A GB 677226A GB 1620447 A GB1620447 A GB 1620447A GB 1620447 A GB1620447 A GB 1620447A GB 677226 A GB677226 A GB 677226A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
cheek
june
electro
recess
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
GB1620447A
Inventor
James Samuel Paterson Roberton
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1620447A priority Critical patent/GB677226A/en
Publication of GB677226A publication Critical patent/GB677226A/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for telephonic receivers

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

677,226. Sound reproducing devices. STANDARD TELEPHONES & CABLES, Ltd. June 18, 1948 [June 19, 1947], No. 16204/47. Class 40 (iv). In an electro acoustic transducer in which a space behind the diaphragm is provided to give added acoustic stiffness, the major part of the wall is formed either by the end of the windings of an operating coil or by a cheek of the spool on which the coil is wound. As shown, the upper cheek 4 of a spool surrounding the centre polepiece 3 rests in a recess in a cylindrical permanent magnet 1 and supports a diaphragm 8 on its outer rim. A recess 5 in the cheek 4 forms with the diaphragm a damping cavity, the effect of which can be adjusted by the provision of holes such as 6 covered by woven silk 7. Specifications 481,351 and 677,225 are referred to.
GB1620447A 1947-06-19 1947-06-19 Improvements in or relating to electro-acoustic transducers Expired GB677226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1620447A GB677226A (en) 1947-06-19 1947-06-19 Improvements in or relating to electro-acoustic transducers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1620447A GB677226A (en) 1947-06-19 1947-06-19 Improvements in or relating to electro-acoustic transducers

Publications (1)

Publication Number Publication Date
GB677226A true GB677226A (en) 1952-08-13

Family

ID=10073043

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1620447A Expired GB677226A (en) 1947-06-19 1947-06-19 Improvements in or relating to electro-acoustic transducers

Country Status (1)

Country Link
GB (1) GB677226A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1115766B (en) * 1956-06-09 1961-10-26 Schoeps Dr Ing Karl Sound receiver
CN105972251A (en) * 2016-07-14 2016-09-28 康以宣 Diaphragm for pneumatic three-way valve and pneumatic three-way valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1115766B (en) * 1956-06-09 1961-10-26 Schoeps Dr Ing Karl Sound receiver
CN105972251A (en) * 2016-07-14 2016-09-28 康以宣 Diaphragm for pneumatic three-way valve and pneumatic three-way valve
CN105972251B (en) * 2016-07-14 2018-05-18 康以宣 For the diaphragm and Pneumatic three-way valve of Pneumatic three-way valve

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