GB1022850A - Electro-acoustic transducer - Google Patents

Electro-acoustic transducer

Info

Publication number
GB1022850A
GB1022850A GB63/65A GB6365A GB1022850A GB 1022850 A GB1022850 A GB 1022850A GB 63/65 A GB63/65 A GB 63/65A GB 6365 A GB6365 A GB 6365A GB 1022850 A GB1022850 A GB 1022850A
Authority
GB
United Kingdom
Prior art keywords
annular
polepiece
jan
glued
parts
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
GB63/65A
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
Publication of GB1022850A publication Critical patent/GB1022850A/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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • 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 
    • H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/10—Telephone receivers

Abstract

1,022,850. Moving coil instruments. STANDARD TELEPHONES & CABLES LTD. Jan. 1, 1965 [Jan. 8, 1964], No. 63/65. Heading H4J. In a moving coil transducer the parts which define the air gap consist of sintered ferromagnetic material. A receiver for use in a telephone instrument has an annular magnet body 1 of Al-Ni-Co alloy or of ferrite. An annular polepiece plate 2 is glued to body 1 and has an annular stud 2a which locates a diaphragm carrier 4. A polepiece 3 has a platelike portion glued to the body 1 and a cylindrical portion fitting inside the body 1. Parts 2 and 3 are of sintered iron. Annular stud 2a reduces losses due to the fringe effects of magnetic lines of force. A resonant cavity 6 improves the frequency response and is formed by the polepiece 3, an air-tight cover plate 7 and a damping filter 8, as described in Specification 1,022,849.
GB63/65A 1964-01-08 1965-01-01 Electro-acoustic transducer Expired GB1022850A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST21526A DE1219521B (en) 1964-01-08 1964-01-08 Electrodynamic converter in telecommunications technology

Publications (1)

Publication Number Publication Date
GB1022850A true GB1022850A (en) 1966-03-16

Family

ID=7459036

Family Applications (1)

Application Number Title Priority Date Filing Date
GB63/65A Expired GB1022850A (en) 1964-01-08 1965-01-01 Electro-acoustic transducer

Country Status (4)

Country Link
US (1) US3296386A (en)
DE (1) DE1219521B (en)
GB (1) GB1022850A (en)
NL (1) NL6500173A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3453400A (en) * 1965-12-08 1969-07-01 Aldo L Coen Field structure for magnetic loudspeaker and methods of manufacture
US3413579A (en) * 1966-03-14 1968-11-26 Westinghouse Electric Corp Magnetic field assembly for electro-mechanical transducers
US3953687A (en) * 1973-11-05 1976-04-27 Carbonneau Industries, Inc. Magnetic structure for moving voice coil loudspeaker
DE2503828C3 (en) * 1975-01-30 1983-04-21 Friedrich Reiner Telefonfabrik Permanent dynamic electroacoustic transducer capsule
US4421956A (en) * 1981-09-29 1983-12-20 Peavey Electronics Corp. Loud speaker with minimized magnetic leakage
US9723410B2 (en) * 2014-07-08 2017-08-01 Harman International Industries, Incorporated Speaker assembly

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675533A (en) * 1951-03-26 1954-04-13 Phillips Petroleum Co Seismometer

Also Published As

Publication number Publication date
NL6500173A (en) 1965-07-09
US3296386A (en) 1967-01-03
DE1219521B (en) 1966-06-23

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