GB624566A - Improvements in or relating to electromagnetic vibratory devices - Google Patents

Improvements in or relating to electromagnetic vibratory devices

Info

Publication number
GB624566A
GB624566A GB1873946A GB1873946A GB624566A GB 624566 A GB624566 A GB 624566A GB 1873946 A GB1873946 A GB 1873946A GB 1873946 A GB1873946 A GB 1873946A GB 624566 A GB624566 A GB 624566A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
magnet
polepiece
polepieces
pairs
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
GB1873946A
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
Priority to BE476263D priority Critical patent/BE476263A/xx
Priority to GB11669/46A priority patent/GB606012A/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB15648/47A priority patent/GB677225A/en
Priority to FR61602D priority patent/FR61602E/en
Priority to FR951325D priority patent/FR951325A/en
Priority to US767241A priority patent/US2610259A/en
Priority to ES0179487A priority patent/ES179487A1/en
Priority to GB28856/48A priority patent/GB677235A/en
Publication of GB624566A publication Critical patent/GB624566A/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
    • 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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/06—Telephone receivers
    • 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)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

624,566. Magnetic instruments. STANDARD TELEPHONES & CABLES, Ltd., and ROBERTON, J. S. P. June 21, 1946, No. 18739. [Class 40 (iv)] The magnet system of a transducer is provided with one or more auxiliary polepieces to form an auxiliary gap in order to divert a part of the magnetic flux flowing in the main gap away from the diaphragm or through a different path in the diaphragm. In Fig. 1, the diaphragm 2 lies slightly within one end of an annular permanent magnet 1 between the main polepiece 4, which carries the operating coil 5, and an auxiliary polepiece 6, the latter being apertured for the passage of sound to or from the diaphragm. In Fig. 2, the polepiece 4 stands on a short bar magnet 1 located at the centre of a cup 8 of magnetic material, and the diaphragm 2 is supported by a conical member 7. In Fig. 3, the permanent magnet takes the form of a flat bar or disc 1 polarized from the centre to the ends or circumference, and the diaphragm is supported by an annular member 9. In Figs. 5, 7 (not shown), a bar magnet has two pairs of polepieces attached to it, the pairs being located on either side of the diaphragm. In an analogous arrangement, Fig. 9, the magnet 11 has consequent poles, while in Fig. 11 both pairs of polepieces 12, 13 and 15, 16 are on the same side of the diaphragm. A practical construction of the arrangement of Fig. 1 is described for use as a telephone earpiece, Figs. 12-14 (not shown), the air spaces and holes on the two sides of the diaphragm being dimensioned as described in Specifications 481,740 and 503,676 to provide appropriate acoustic systems. Specification 624,149 also is referred to.
GB1873946A 1946-06-21 1946-06-21 Improvements in or relating to electromagnetic vibratory devices Expired GB624566A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
BE476263D BE476263A (en) 1946-06-21
GB11669/46A GB606012A (en) 1946-06-21 1946-04-16 Improvements in or relating to electro magnetic vibratory devices
GB15648/47A GB677225A (en) 1946-06-21 1947-06-13 Improvements in or relating to electro-acoustic transducers
FR61602D FR61602E (en) 1946-06-21 1947-08-06 Acoustic devices, and in particular telephone receivers
FR951325D FR951325A (en) 1946-06-21 1947-08-06 Acoustic devices and in particular telephone receivers
US767241A US2610259A (en) 1946-06-21 1947-08-07 Electromagnetic vibratory device
ES0179487A ES179487A1 (en) 1946-06-21 1947-08-28 IMPROVEMENTS IN ELECTROMECHANICAL VIBRATORY DEVICES
GB28856/48A GB677235A (en) 1946-06-21 1948-11-05 Improvements in or relating to electro-acoustic transducers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2745348A GB666408A (en) 1948-10-22 1948-10-22 Improvements in or relating to electro-magnetic vibratory devices

Publications (1)

Publication Number Publication Date
GB624566A true GB624566A (en) 1949-06-13

Family

ID=10259833

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1873946A Expired GB624566A (en) 1946-06-21 1946-06-21 Improvements in or relating to electromagnetic vibratory devices
GB2745348A Expired GB666408A (en) 1946-06-21 1948-10-22 Improvements in or relating to electro-magnetic vibratory devices

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB2745348A Expired GB666408A (en) 1946-06-21 1948-10-22 Improvements in or relating to electro-magnetic vibratory devices

Country Status (1)

Country Link
GB (2) GB624566A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE966469C (en) * 1953-01-22 1957-08-08 Telefonbau & Normalzeit Gmbh Electromagnetic switching and / or alarm device

Also Published As

Publication number Publication date
GB666408A (en) 1952-02-13

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