GB1364669A - Electro acoustic transducers - Google Patents

Electro acoustic transducers

Info

Publication number
GB1364669A
GB1364669A GB5993071A GB5993071A GB1364669A GB 1364669 A GB1364669 A GB 1364669A GB 5993071 A GB5993071 A GB 5993071A GB 5993071 A GB5993071 A GB 5993071A GB 1364669 A GB1364669 A GB 1364669A
Authority
GB
United Kingdom
Prior art keywords
armature
permanent magnets
diaphragm
pivoted
magnetic circuit
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
GB5993071A
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 GB5993071A priority Critical patent/GB1364669A/en
Priority to US00308381A priority patent/US3836733A/en
Priority to AU49595/72A priority patent/AU465688B2/en
Priority to IT33100/72A priority patent/IT972504B/en
Priority to ES409986A priority patent/ES409986A1/en
Publication of GB1364669A publication Critical patent/GB1364669A/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
    • H04R11/00—Transducers of moving-armature or moving-core type

Abstract

1364669 Loud-speakers; microphones STANDARD TELEPHONES & CABLES Ltd 14 Dec 1972 [23 Dec 1971] 59930/71 Heading H4J A transducer for use with a microphone, loud-speaker, or telephone earpiece comprises a pivoted elongate armature of magnetically soft material, e.g. ferro-magnetic material, having a permanent magnet attached at one end and situated between the poles of further permanent magnets. The permanent magnets are made of rare-earth cobalt alloys of coercivity of the order of 10,000 oersted, e.g. the magnets may each be a 1 mm. cube of a samarium-cobalt alloy. A first embodiment (Fig. 2) includes a pivoted armature 10 having permanent magnets 11, 12 attached thereto and a coil wound around its magnetically soft portion for supplying a drive current for a diaphragm 13 or for receiving a current caused by the diaphragm being driven. Four further permanent magnets 14-17 are used as the stationary polepieces without the need for the usual soft magnetic circuit. The arrangement of Fig. 3 includes a soft magnetic circuit 20 coupling two permanent magnets. The armature is pivoted at one end and is laminated, the laminations being formed as horns 22-23 directed at the air gaps in the magnetic circuit. In this arrangement the central magnet provides positive stiffness to the armature vibrations, whilst the outer laminµ act like a conventional balanced armature giving negative stiffness. A pick up coil (or drive coil) may be mounted on the armature as shown or on the soft magnetic U-shaped yoke 20. The manner in which the armature is driven by (drives) the diaphragm is not disclosed.
GB5993071A 1971-12-23 1971-12-23 Electro acoustic transducers Expired GB1364669A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB5993071A GB1364669A (en) 1971-12-23 1971-12-23 Electro acoustic transducers
US00308381A US3836733A (en) 1971-12-23 1972-11-21 Electro-acoustic armature transducer
AU49595/72A AU465688B2 (en) 1971-12-23 1972-12-04 Improvements in or relating to electroacoustic transducers
IT33100/72A IT972504B (en) 1971-12-23 1972-12-19 PERFECTION IN ELECTROACOUSTIC TRANSDUCERS
ES409986A ES409986A1 (en) 1971-12-23 1972-12-22 Electro-acoustic armature transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5993071A GB1364669A (en) 1971-12-23 1971-12-23 Electro acoustic transducers

Publications (1)

Publication Number Publication Date
GB1364669A true GB1364669A (en) 1974-08-29

Family

ID=10484678

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5993071A Expired GB1364669A (en) 1971-12-23 1971-12-23 Electro acoustic transducers

Country Status (5)

Country Link
US (1) US3836733A (en)
AU (1) AU465688B2 (en)
ES (1) ES409986A1 (en)
GB (1) GB1364669A (en)
IT (1) IT972504B (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937904A (en) * 1974-08-07 1976-02-10 Hitachi Magnetics Corporation Moving magnet electroacoustic transducer
DK152477C (en) * 1977-03-14 1988-08-01 Burundukov Valentin M ELECTRODYNAMIC TRANSDUCER FOR THE TRANSMISSION OF MECHANICAL VERSIONS TO ELECTRICAL SIGNALS OR vice versa, as well as stereo and monophonic pickup heads and electrodynamic microphones with such a transducer.
GB9222677D0 (en) * 1992-10-29 1992-12-09 Knowles Electronics Co Electroacoustic transducer
US5647013C1 (en) * 1992-10-29 2001-05-08 Knowles Electronics Co Electroacoustic transducer
NL1004669C2 (en) * 1996-12-02 1998-06-03 Microtronic Nederland Bv Transducer.
US6658134B1 (en) 1999-08-16 2003-12-02 Sonionmicrotronic Nederland B.V. Shock improvement for an electroacoustic transducer
US6831538B2 (en) * 2002-04-02 2004-12-14 Bei Sensors And Systems Company, Inc. Linear voice coil actuator as a controllable electromagnetic compression spring
US8295537B2 (en) * 2010-03-31 2012-10-23 Bose Corporation Loudspeaker moment and torque balancing
US8295536B2 (en) * 2010-03-31 2012-10-23 Bose Corporation Moving magnet levered loudspeaker
US9055370B2 (en) 2012-08-31 2015-06-09 Bose Corporation Vibration-reducing passive radiators
US10028062B2 (en) 2013-03-15 2018-07-17 Bose Corporation Driving plural armatures with a common stator
US9357279B2 (en) 2014-03-07 2016-05-31 Bose Corporation Elastomeric torsion bushings for levered loudspeakers
US9601969B2 (en) 2014-03-07 2017-03-21 Bose Corporation Inhibiting rocking of loads driven by plural levers
US9258648B2 (en) 2014-03-07 2016-02-09 Bose Corporation Levered loudspeakers
US9497549B2 (en) 2014-03-07 2016-11-15 Bose Corporation Levered loudspeakers
CN104284279A (en) * 2014-11-03 2015-01-14 常州阿木奇声学科技有限公司 Moving iron trumpet magnetic circuit system
US10154347B2 (en) * 2015-10-23 2018-12-11 Bose Corporation Bushings constrained by compression in levered apparatus
CN108337587B (en) * 2017-01-20 2020-08-14 苏州三色峰电子有限公司 Telephone receiver suitable for automatic assembly and manufacturing method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1559158A (en) * 1923-12-11 1925-10-27 Gen Electric Sound-emitting device
US1761745A (en) * 1927-08-09 1930-06-03 Paramount Famous Lasky Corp Speaker
US2073561A (en) * 1934-08-16 1937-03-09 Mccracken John Sound reproducing means
US3695945A (en) * 1970-04-30 1972-10-03 Gen Electric Method of producing a sintered cobalt-rare earth intermetallic product

Also Published As

Publication number Publication date
US3836733A (en) 1974-09-17
IT972504B (en) 1974-05-31
ES409986A1 (en) 1975-12-01
AU465688B2 (en) 1975-10-02
AU4959572A (en) 1974-06-06

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees