DK118903B - Magnetic system comprising an annular permanent main magnet with an upper pole piece, a lower piece of soft iron pole, a core and one or more auxiliary magnets. - Google Patents

Magnetic system comprising an annular permanent main magnet with an upper pole piece, a lower piece of soft iron pole, a core and one or more auxiliary magnets.

Info

Publication number
DK118903B
DK118903B DK107969AA DK107969A DK118903B DK 118903 B DK118903 B DK 118903B DK 107969A A DK107969A A DK 107969AA DK 107969 A DK107969 A DK 107969A DK 118903 B DK118903 B DK 118903B
Authority
DK
Denmark
Prior art keywords
piece
core
magnetic system
soft iron
main magnet
Prior art date
Application number
DK107969AA
Other languages
Danish (da)
Inventor
W Hofman
Original Assignee
Philips Nv
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 claimed from NL6802907A external-priority patent/NL6802907A/xx
Priority claimed from NL6814825A external-priority patent/NL6814825A/en
Application filed by Philips Nv filed Critical Philips Nv
Publication of DK118903B publication Critical patent/DK118903B/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0273—Magnetic circuits with PM for magnetic field generation
    • H01F7/0289—Transducers, loudspeakers, moving coil arrangements
    • 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
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/022—Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils
DK107969AA 1968-03-01 1969-02-26 Magnetic system comprising an annular permanent main magnet with an upper pole piece, a lower piece of soft iron pole, a core and one or more auxiliary magnets. DK118903B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL6802907A NL6802907A (en) 1968-03-01 1968-03-01
NL6814825A NL6814825A (en) 1968-10-16 1968-10-16 Auxiliary magnet for permanent magnet loudspeaker

Publications (1)

Publication Number Publication Date
DK118903B true DK118903B (en) 1970-10-19

Family

ID=26644303

Family Applications (1)

Application Number Title Priority Date Filing Date
DK107969AA DK118903B (en) 1968-03-01 1969-02-26 Magnetic system comprising an annular permanent main magnet with an upper pole piece, a lower piece of soft iron pole, a core and one or more auxiliary magnets.

Country Status (6)

Country Link
US (1) US3593239A (en)
BE (1) BE729073A (en)
CH (1) CH494459A (en)
DE (1) DE1907969A1 (en)
DK (1) DK118903B (en)
FR (1) FR2003076A1 (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3783311A (en) * 1970-12-19 1974-01-01 Coral Audio Corp Magnetic device for use in acoustic apparatus
FR2137567B1 (en) * 1971-05-07 1977-08-26 Rank Organisation Ltd
US3953687A (en) * 1973-11-05 1976-04-27 Carbonneau Industries, Inc. Magnetic structure for moving voice coil loudspeaker
US4063448A (en) * 1976-08-25 1977-12-20 Agar Instrumentation Inc. Density meter coil assembly
US4187444A (en) * 1978-01-19 1980-02-05 Varian Associates, Inc. Open-circuit magnet structure for cross-field tubes and the like
US4293741A (en) * 1979-06-21 1981-10-06 Digre Clifford B Magnet assembly
JPS59139794A (en) * 1983-01-31 1984-08-10 Ibuki Kogyo Kk Horn speaker eliminating leaked magnetic field
US5075662A (en) * 1989-11-14 1991-12-24 The United States Of America As Represented By The Secretary Of The Army Enhanced magnetic field within enclosed annular cavity
DE29512102U1 (en) * 1995-07-27 1995-10-05 Nokia Deutschland Gmbh Magnet system
US8603017B2 (en) * 2005-03-07 2013-12-10 American Medical Innovations, L.L.C. Vibrational therapy assembly for treating and preventing the onset of deep venous thrombosis
US20080139979A1 (en) * 2005-07-18 2008-06-12 Juvent, Inc. Vibrational therapy assembly adapted for removably mounting to a bed
US20070213179A1 (en) * 2006-03-09 2007-09-13 Juvent, Inc. Mechanical loading apparatus having a signal modulating assembly
WO2008008340A2 (en) * 2006-07-11 2008-01-17 Juvent, Inc. System and method for a low profile vibrating plate
TWI545973B (en) * 2014-01-29 2016-08-11 Merry Electronics Co Ltd External magnetic circuit improved structure

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1076838B (en) * 1956-06-14 1960-03-03 Deutsche Edelstahlwerke Ag Permanent magnet system with central iron core
NL111475C (en) * 1958-10-15

Also Published As

Publication number Publication date
DE1907969A1 (en) 1969-09-25
FR2003076A1 (en) 1969-11-07
US3593239A (en) 1971-07-13
BE729073A (en) 1969-08-27
CH494459A (en) 1970-07-31

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