GB278469A - Improvements in electro-mechanical vibration translation devices, such as telephone transmitters or receivers - Google Patents

Improvements in electro-mechanical vibration translation devices, such as telephone transmitters or receivers

Info

Publication number
GB278469A
GB278469A GB1845826A GB1845826A GB278469A GB 278469 A GB278469 A GB 278469A GB 1845826 A GB1845826 A GB 1845826A GB 1845826 A GB1845826 A GB 1845826A GB 278469 A GB278469 A GB 278469A
Authority
GB
United Kingdom
Prior art keywords
magnetic
magnetic material
constituted
finely divided
coil
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
GB1845826A
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.)
BRITISH BROADCASTING Co L
Original Assignee
BRITISH BROADCASTING Co L
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 BRITISH BROADCASTING Co L filed Critical BRITISH BROADCASTING Co L
Priority to GB1845826A priority Critical patent/GB278469A/en
Publication of GB278469A publication Critical patent/GB278469A/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

Landscapes

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

Abstract

278,469. West, A. G. D., and British Broadcasting Co., Ltd. July 23, 1926. Magnetic instruments; diaphragms.- A device for converting mechanical vibrations into electrical vibrations and vice versa by electromagnetic induction, more particularly for use as a telephone transmitter, receiver or loudspeaker, comprises a magnetic circuit, a portion of which is constituted by one or more bodies consisting, at least in part, of magnetic material, and supported solely by the magnetic field. In its simplest form, a magnetic air gap is partially bridged by a body in the form of a thin lamina of magnetic material. The body or bodies may be constituted by magnetic material or by non-magnetic material coated with magnetic material. A modified construction is described in which a portion of the magnetic circuit is constituted by finely divided magnetic material substantially unsupported excepting by the magnetic flux. In a further modification, the finely divided material may be supported upon a membrane between a pair of magnet poles so as to be substantially unconstrained in the direction of its vibrational movement. The material may either be attached to the membrane by an adhesive or deposited thereon in colloidal form. In the construction shown in Fig. 1, the electromagnet 1 is excited by a coil 2 and is provided with pole-pieces 3, the air gap between which is bridged by finely divided magnetic material 4, which constitutes a substantially aperiodic diaphragm. The material 4 may be supported on or enclosed in a thin material so that it remains in position when the magnetizing current is interrupted. Pick-up coils may be provided on the magnet limbs or the polarizing coil 2 may serve as the pick-up coil. In a modification, the material 4 is situated in the annular air-gap of a pot-shaped magnet. In order to prevent resonance, the air chamber behind the diaphragm, where this exists, may be provided with apertures communicating with the outside air and damping material, such as cotton wool, may be inserted in the chamber.
GB1845826A 1926-07-23 1926-07-23 Improvements in electro-mechanical vibration translation devices, such as telephone transmitters or receivers Expired GB278469A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1845826A GB278469A (en) 1926-07-23 1926-07-23 Improvements in electro-mechanical vibration translation devices, such as telephone transmitters or receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1845826A GB278469A (en) 1926-07-23 1926-07-23 Improvements in electro-mechanical vibration translation devices, such as telephone transmitters or receivers

Publications (1)

Publication Number Publication Date
GB278469A true GB278469A (en) 1927-10-13

Family

ID=10112771

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1845826A Expired GB278469A (en) 1926-07-23 1926-07-23 Improvements in electro-mechanical vibration translation devices, such as telephone transmitters or receivers

Country Status (1)

Country Link
GB (1) GB278469A (en)

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