US3129298A - Electro-dynamic conical loudspeaker - Google Patents

Electro-dynamic conical loudspeaker Download PDF

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Publication number
US3129298A
US3129298A US108346A US10834661A US3129298A US 3129298 A US3129298 A US 3129298A US 108346 A US108346 A US 108346A US 10834661 A US10834661 A US 10834661A US 3129298 A US3129298 A US 3129298A
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US
United States
Prior art keywords
magnet
lid plate
plate
loudspeaker
foot plate
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 - Lifetime
Application number
US108346A
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English (en)
Inventor
Hofman Wytze
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3129298A publication Critical patent/US3129298A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • FIG. 1 ELECTRO-DYNAMIC CONICAL LOUDSPEAKER Filed May 8. 1961 3 MAGNETS MAGNETS FIG. 1
  • the invention relates to an electro-dynamic conical loud speaker and has for its object to provide a flatshaped structure thereof, so that the loudspeader can be accommodated in a shallow cabinet.
  • the required depth of the cabinet is determined only or mainly by the size of the loudspeaker in the direction of depth, so that a maximum flatness of the loudspeaker is very important.
  • the loudspeaker comprises an annular magnet and cylindrical core supported on a soft iron foot plate and a soft iron lid plate supported on the annular magnet.
  • the lid plate has a centrol concavity projecting towards the foot plate and constituting, together with the said central core, the air gap.
  • the speaker diaphram or cone is thus completely accommodated in the space circumscribed by the annular magnet and associated foot and lid plate.
  • the core is formed by a permanent magnet, of which the magnetisation direction is opposite that of the adjacent annular magnet, the height of the latter magnet can be reduced, so that an even greater flatness of the loudspeaker is obtained.
  • FIGS. 1 and 2 illustrate cross sectional views of two different embodiments of the invention.
  • a loudspeaker comprising an axially polarized permanent magnet of annular configuration, a soft iron disc shaped foot plate supporting said magnet, a magnetizable core on said foot plate concentric with said magnet, a conical soft iron lid plate supported on said magnet, said lid plate having a central concavity extending toward said foot plate and spaced therefrom, a central aperture in said lid plate defining an air gap with said core a voice coil Within said air gap, a speaker diaphragm sup porting said voice coil, said diaphragm secured to said lid plate and receivable within said central concavity, a second magnet in the space between said foot plate and the adjacent portion of said lid plate having the same polarity as said annular magnet, and means for venting the space between said diaphragm and said lid plate.
  • a loudspeaker according to claim 1 with the addition of a membrane extending from the apex of said diaphragm to the adjacent portion of said lid plate, said membrane defining a shield against entry of dirt into said air gap.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US108346A 1960-05-10 1961-05-08 Electro-dynamic conical loudspeaker Expired - Lifetime US3129298A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL3129298X 1960-05-10

Publications (1)

Publication Number Publication Date
US3129298A true US3129298A (en) 1964-04-14

Family

ID=19877136

Family Applications (1)

Application Number Title Priority Date Filing Date
US108346A Expired - Lifetime US3129298A (en) 1960-05-10 1961-05-08 Electro-dynamic conical loudspeaker

Country Status (3)

Country Link
US (1) US3129298A (de)
DE (1) DE1180416B (de)
NL (2) NL112264C (de)

Cited By (8)

* 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
US5835612A (en) * 1996-02-29 1998-11-10 Sony Corporation Speaker apparatus
US20040105568A1 (en) * 2002-12-03 2004-06-03 Po-Hsiung Lee Speaker with enhanced magnetic flux
US20050220320A1 (en) * 2004-03-30 2005-10-06 Kim Kyung-Tae Speaker for mobile terminals and manufacturing method thereof
US20060165251A1 (en) * 2002-10-10 2006-07-27 New Transducers Limited Magnet assembly for loudspeakers
US20120177246A1 (en) * 2011-01-06 2012-07-12 American Audio Components Inc. Multi-magnet system and speaker using same
US8340336B1 (en) * 2006-01-25 2012-12-25 At&T Mobility Ii Llc Magnetic coupling enhanced speaker assembly
US20140079252A1 (en) * 2011-05-03 2014-03-20 Knowles Electronics Asia Pte.Ltd Loudspeaker with port comprising a particle filter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2085721A (en) * 1932-10-29 1937-06-29 Rca Corp Sound translating device
US2256689A (en) * 1939-06-17 1941-09-23 Quam Nichols Company Air gap shield for loud-speakers
US2498825A (en) * 1943-09-15 1950-02-28 Hartford Nat Bank & Trust Comp Moving coil transducer and enclosure
US2862069A (en) * 1956-02-28 1958-11-25 Roanwell Corp Dynamic transducer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1986656A (en) * 1932-10-20 1935-01-01 Bell Telephone Labor Inc Sealed joint and method of making same
US2186576A (en) * 1936-04-17 1940-01-09 Cinaudagraph Corp Reproducer
FR920048A (fr) * 1946-01-15 1947-03-25 Haut-parleur à encombrement réduit
US2566604A (en) * 1948-03-16 1951-09-04 William C Eaves Electrodynamic loud-speaker assembly
AT168820B (de) * 1950-02-04 1951-08-25 Boris Dipl Ing Koleff Elektroakustischer Wandler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2085721A (en) * 1932-10-29 1937-06-29 Rca Corp Sound translating device
US2256689A (en) * 1939-06-17 1941-09-23 Quam Nichols Company Air gap shield for loud-speakers
US2498825A (en) * 1943-09-15 1950-02-28 Hartford Nat Bank & Trust Comp Moving coil transducer and enclosure
US2862069A (en) * 1956-02-28 1958-11-25 Roanwell Corp Dynamic transducer

Cited By (11)

* 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
US5835612A (en) * 1996-02-29 1998-11-10 Sony Corporation Speaker apparatus
US20060165251A1 (en) * 2002-10-10 2006-07-27 New Transducers Limited Magnet assembly for loudspeakers
US7197155B2 (en) * 2002-10-10 2007-03-27 New Transducers Limited Magnet assembly for loudspeakers
US20040105568A1 (en) * 2002-12-03 2004-06-03 Po-Hsiung Lee Speaker with enhanced magnetic flux
US20050220320A1 (en) * 2004-03-30 2005-10-06 Kim Kyung-Tae Speaker for mobile terminals and manufacturing method thereof
US8340336B1 (en) * 2006-01-25 2012-12-25 At&T Mobility Ii Llc Magnetic coupling enhanced speaker assembly
US20120177246A1 (en) * 2011-01-06 2012-07-12 American Audio Components Inc. Multi-magnet system and speaker using same
US8649550B2 (en) * 2011-01-06 2014-02-11 Aac Acoustic Technologies (Shenzhen) Co., Ltd. Multi-magnet system and speaker using same
US20140079252A1 (en) * 2011-05-03 2014-03-20 Knowles Electronics Asia Pte.Ltd Loudspeaker with port comprising a particle filter
US9137593B2 (en) * 2011-05-03 2015-09-15 Knowles Ipc (M) Sdn. Bhd. Loudspeaker with port comprising a particle filter

Also Published As

Publication number Publication date
NL251440A (de)
NL112264C (de)
DE1180416B (de) 1964-10-29

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