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GB499830A - Improvements in or relating to loud-speaker magnet assemblies - Google Patents

Improvements in or relating to loud-speaker magnet assemblies

Info

Publication number
GB499830A
GB499830A GB20963/37A GB2096337A GB499830A GB 499830 A GB499830 A GB 499830A GB 20963/37 A GB20963/37 A GB 20963/37A GB 2096337 A GB2096337 A GB 2096337A GB 499830 A GB499830 A GB 499830A
Authority
GB
United Kingdom
Prior art keywords
loud
plate
pole
relating
magnet assemblies
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
GB20963/37A
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.)
Robert Bosch AG
Robert Bosch GmbH
Original Assignee
Robert Bosch AG
Robert Bosch GmbH
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 Robert Bosch AG, Robert Bosch GmbH filed Critical Robert Bosch AG
Publication of GB499830A publication Critical patent/GB499830A/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

Landscapes

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

Abstract

499,830. Loud - speakers ; magnets. BOSCH AKT.-GES., R. July 29, 1937, No. 20963. Convention date, Aug. 6, 1936. [Class 40 (iv)] [Also in Group XXXV] In a magnet assembly for a loud-speaker comprising an annular permanent magnet b, the area of the surface between the annular magnet and the outer edge of the air gap f between the centre polepiece d and the outer pole-plate c is of the same order of magnitude as the cross-sectional area of the air gap. The diameter of the polepiece d at a point g immediately below the pole-plate c is less than that of the portion within the gap f. The permanent magnet b, which is secured to the pole-plate c and to a base-plate a by welding at the points e, may have its inner and /or its outer surface tapered.
GB20963/37A 1936-08-06 1937-07-29 Improvements in or relating to loud-speaker magnet assemblies Expired GB499830A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE499830X 1936-08-06

Publications (1)

Publication Number Publication Date
GB499830A true GB499830A (en) 1939-01-30

Family

ID=6545527

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20963/37A Expired GB499830A (en) 1936-08-06 1937-07-29 Improvements in or relating to loud-speaker magnet assemblies

Country Status (2)

Country Link
FR (1) FR825219A (en)
GB (1) GB499830A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5402503A (en) * 1992-10-09 1995-03-28 Nokia Technology Gmbh Light-weight conical loudspeaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5402503A (en) * 1992-10-09 1995-03-28 Nokia Technology Gmbh Light-weight conical loudspeaker

Also Published As

Publication number Publication date
FR825219A (en) 1938-02-25

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