CH313462A - Device with at least one ferromagnetic part with an initial permeability of at least 500 and a permanent magnet in the form of a thin body - Google Patents

Device with at least one ferromagnetic part with an initial permeability of at least 500 and a permanent magnet in the form of a thin body

Info

Publication number
CH313462A
CH313462A CH313462DA CH313462A CH 313462 A CH313462 A CH 313462A CH 313462D A CH313462D A CH 313462DA CH 313462 A CH313462 A CH 313462A
Authority
CH
Switzerland
Prior art keywords
permanent magnet
initial permeability
thin body
ferromagnetic part
ferromagnetic
Prior art date
Application number
Other languages
German (de)
Inventor
Thomas Van Urk Arend
Rademakers Adriaan
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
Application filed by Philips Nv filed Critical Philips Nv
Publication of CH313462A publication Critical patent/CH313462A/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
    • H01F1/0311—Compounds
    • H01F1/0313—Oxidic compounds
    • H01F1/0315—Ferrites
    • 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
    • H01F7/021—Construction of PM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Hard Magnetic Materials (AREA)
CH313462D 1951-04-23 1951-08-27 Device with at least one ferromagnetic part with an initial permeability of at least 500 and a permanent magnet in the form of a thin body CH313462A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL313462X 1951-04-23

Publications (1)

Publication Number Publication Date
CH313462A true CH313462A (en) 1956-04-15

Family

ID=19783713

Family Applications (1)

Application Number Title Priority Date Filing Date
CH313462D CH313462A (en) 1951-04-23 1951-08-27 Device with at least one ferromagnetic part with an initial permeability of at least 500 and a permanent magnet in the form of a thin body

Country Status (5)

Country Link
US (1) US2698917A (en)
BE (1) BE505468A (en)
CH (1) CH313462A (en)
FR (1) FR1041525A (en)
GB (1) GB708136A (en)

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2778803A (en) * 1953-02-06 1957-01-22 Aerovox Corp Magnetically hard materials
DE1011466B (en) * 1955-06-18 1957-07-04 Philips Patentverwaltung Magnet system for electroacoustic transducers
DE1020098B (en) * 1955-10-03 1957-11-28 Stepper & Co Brake magnet arrangement for a rotor disk, in particular for electricity counters
US2943246A (en) * 1956-02-28 1960-06-28 Howard C Riordan Magnetic detachable holding device
US2920253A (en) * 1956-03-06 1960-01-05 Engineered Products Company Magnetic catch
US2972745A (en) * 1956-04-17 1961-02-21 Hamilton Watch Co Electric wrist watch
US2966106A (en) * 1957-01-05 1960-12-27 Schneider Co Optische Werke Magnetic system for producing arcuate motions
US2923783A (en) * 1957-06-17 1960-02-02 Stanley F White Electro-acoustical transducer
US3095525A (en) * 1958-01-20 1963-06-25 Crucible Steel Co America Permanent magnet assembly
US3090107A (en) * 1958-07-24 1963-05-21 Sylvania Electric Prod Method of making a permanent magnet
US3022398A (en) * 1959-05-15 1962-02-20 Fluidwick Company Inc Electric control device
US3049636A (en) * 1959-06-22 1962-08-14 Chrysler Corp Magnetically driven devices
US3000016A (en) * 1960-03-03 1961-09-19 Stockwell A Ridge Magnetic securing means
DE1172384B (en) * 1960-03-03 1964-06-18 Magnetfab Bonn Gmbh Magnetic flexible layer body
US3034320A (en) * 1960-03-21 1962-05-15 Coro Inc Magnetic earring construction including means to concentrate the magnetic force
US3071939A (en) * 1960-05-27 1963-01-08 Coro Inc Magnetic earring with slidably pivoted clamp members
US3134057A (en) * 1960-07-11 1964-05-19 Sumitomo Metal Ind Magnetic circuit for the deflection of flux leakage
US3140430A (en) * 1960-07-15 1964-07-07 Radio Frequency Lab Inc Standard magnet structure with predetermined air-gap
US3173067A (en) * 1962-03-22 1965-03-09 Westinghouse Electric Corp Temperature-compensated permanent-magnet devices
US3413551A (en) * 1964-06-22 1968-11-26 Westinghouse Electric Corp Induction devices having low side thrust
US3304527A (en) * 1965-04-26 1967-02-14 Ibm Magnetic holding and aligning device
BE755398A (en) * 1969-11-28 1971-02-01 Honeywell Inc MAGNET EXCITATION ARRANGEMENT FOR A MAGNETO-SENSITIVE DEVICE, AND PROCESS FOR ACHIEVING IT
US4077242A (en) * 1976-12-15 1978-03-07 Sedley Bruce S Metal magnetic key
US5125134A (en) * 1985-12-27 1992-06-30 Tamao Morita Magnetic fastener
FR2614656B1 (en) * 1987-04-30 1989-06-16 Comadur Sa MAGNETIC ASSEMBLY DEVICE, PARTICULARLY FOR DENTAL PROSTHESIS
US4857841A (en) * 1987-12-29 1989-08-15 Eaton Corporation Proximity detector employing magneto resistive sensor in the central magnetic field null of a toroidal magnet
JP2561109B2 (en) * 1988-01-27 1996-12-04 株式会社応用技術研究所 Magnetic hook
JPH02105503A (en) * 1988-10-14 1990-04-18 Oyo Gijutsu Kenkyusho:Kk Magnetic tool for latching and locking
JP3161673B2 (en) * 1994-05-30 2001-04-25 松下電器産業株式会社 Magnetic circuit unit for micro speaker and method of manufacturing the same
JPH11275678A (en) * 1998-03-25 1999-10-08 Sony Corp Speaker device
US7372968B2 (en) * 2000-11-08 2008-05-13 New Transducers Limited Loudspeaker driver
US20040005074A1 (en) * 2002-07-08 2004-01-08 Sun Technique Electric Co., Ltd. Hi-fi tweeter
US8358801B2 (en) 2007-02-12 2013-01-22 Robert Katz Magnetic circuit for electrodynamic moving voice coil actuators
US10978230B2 (en) * 2018-11-07 2021-04-13 Livivos Inc. Magnet arrangement for producing a field suitable for NMR in a concave region

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB406086A (en) * 1932-11-03 1934-02-22 Darwins Ltd Improvements in or relating to permanent magnets
FR867783A (en) * 1939-11-24 1941-11-27 Thomson Houston Comp Francaise Improvements to permanent magnets
GB549643A (en) * 1941-05-27 1942-12-01 Standard Telephones Cables Ltd Improvements in or relating to telephone transmitters and receivers

Also Published As

Publication number Publication date
FR1041525A (en) 1953-10-23
US2698917A (en) 1955-01-04
BE505468A (en)
GB708136A (en) 1954-04-28

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