FR2045870A7 - Permanent magnet system for a loudspeaker - Google Patents

Permanent magnet system for a loudspeaker

Info

Publication number
FR2045870A7
FR2045870A7 FR7017572A FR7017572A FR2045870A7 FR 2045870 A7 FR2045870 A7 FR 2045870A7 FR 7017572 A FR7017572 A FR 7017572A FR 7017572 A FR7017572 A FR 7017572A FR 2045870 A7 FR2045870 A7 FR 2045870A7
Authority
FR
France
Prior art keywords
soft iron
magnetic
plate
air gap
loudspeaker
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
FR7017572A
Other languages
French (fr)
Other versions
FR2045870B3 (en
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.)
Deutsche Edelstahlwerke AG
Original Assignee
Deutsche Edelstahlwerke AG
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 Deutsche Edelstahlwerke AG filed Critical Deutsche Edelstahlwerke AG
Application granted granted Critical
Publication of FR2045870A7 publication Critical patent/FR2045870A7/en
Publication of FR2045870B3 publication Critical patent/FR2045870B3/fr
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
    • 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

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

Rod or toroidal axially magnetized permanent and soft iron magnetic components, i.e. base plate or pot, cover and core compose the system. Part plate or ferro-magnetic circuit is in a compact alloyed ferritic steel which can be machined. It has higher electrical resistivity but lower magnetic resistivity than soft iron. Its magnetic saturation is equal to or greater than that required for the air gap induction. The parts near the air gap are of such material i.e. the cover plate and an end plate on the soft iron core. Carbon, silicon, aluminium and chromium are included in the alloy.
FR7017572A 1969-06-06 1970-05-14 Permanent magnet system for a loudspeaker Expired FR2045870A7 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691928638 DE1928638C3 (en) 1969-06-06 1969-06-06 Permanent magnet system for loudspeakers

Publications (2)

Publication Number Publication Date
FR2045870A7 true FR2045870A7 (en) 1971-03-05
FR2045870B3 FR2045870B3 (en) 1973-03-16

Family

ID=5736157

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7017572A Expired FR2045870A7 (en) 1969-06-06 1970-05-14 Permanent magnet system for a loudspeaker

Country Status (6)

Country Link
BE (1) BE750585A (en)
DE (1) DE1928638C3 (en)
ES (1) ES377796A1 (en)
FR (1) FR2045870A7 (en)
NL (1) NL7007916A (en)
NO (1) NO122194B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010047057A1 (en) * 2010-10-05 2012-04-05 Mathias Eß Device for fixing piece-shaped food products e.g. cheeses, to base element i.e. board, for cutting food products, has fixing element guided at or in base element, where insertion direction of fixing element runs parallel to contact surface

Also Published As

Publication number Publication date
ES377796A1 (en) 1972-05-16
FR2045870B3 (en) 1973-03-16
NO122194B (en) 1971-06-01
DE1928638C3 (en) 1974-10-24
NL7007916A (en) 1970-12-08
DE1928638B2 (en) 1974-02-21
DE1928638A1 (en) 1970-12-10
BE750585A (en) 1970-11-03

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Legal Events

Date Code Title Description
ST Notification of lapse