US1808297A - Loud speaker - Google Patents

Loud speaker Download PDF

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Publication number
US1808297A
US1808297A US450128A US45012830A US1808297A US 1808297 A US1808297 A US 1808297A US 450128 A US450128 A US 450128A US 45012830 A US45012830 A US 45012830A US 1808297 A US1808297 A US 1808297A
Authority
US
United States
Prior art keywords
pole piece
diaphragm
annular
coil
central
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
US450128A
Other languages
English (en)
Inventor
Dempster Burgess
John C Koonz
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.)
Philips North America LLC
Original Assignee
Magnavox Co
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 to BE379042D priority Critical patent/BE379042A/xx
Priority to NL32218D priority patent/NL32218C/xx
Application filed by Magnavox Co filed Critical Magnavox Co
Priority to US450128A priority patent/US1808297A/en
Priority to FR715100D priority patent/FR715100A/fr
Priority to GB11145/31A priority patent/GB369030A/en
Application granted granted Critical
Publication of US1808297A publication Critical patent/US1808297A/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
    • 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
    • H04R9/06—Loudspeakers
    • 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

Definitions

  • Fig. 1 is the front view in elevation of a complete speaker
  • Fig. 2 is a vertical sectional view taken through the center of the speaker illustrated in Fig. 1,
  • Fig. 3 is an enlarged sectional view showing a detail of construction where the parts of the magnetic frame structure meet
  • Fig. 4 isan enlarged fragmentary view in section showing a modified form of pole spacing and centering device.
  • FIG. 10 designates a relatively fiat plate-like member of magnetic material having four sectors cut out so as to form inwardly projecting portions or spoke members 11, which merge to form a central support for an inner pole piece 12.
  • the pole piece 12 is shown as projecting inwardly from its supporting members 11.
  • a second frame member of magnetic material designated by the numeral 13 is shown as secured to the plate-like member 10 at its outer edge.
  • This second frame member 13 is illustrated as substantially conical in shape and as having a flattened portion 14 at its apex which projects inwardly toward the projecting or inner end of the central pole piece 12.
  • annular pole piece 15 which in conjunction with the pole piece 12 forms an annular air-gap in which a diaphragm actuating coil 16 may operate.
  • the coil 16 is shown as secured to the apex of a conical diaphragm 17 which is secured at its outer rim by means of a flexible skiver 18 to the frame members 10 and 13 at the point where the latter members are secured to gether.
  • suitable yielding washers 19 of felt or cardboard. These yielding washers 19 are adapted to engage the skiver 18 and permit a relative movement betweenthe frame members 10 and 13 as they are drawn tightly together by the screws 20 to form a tight magnetic fit.
  • a flexible centering means 21 which serves to hold the diaphragm operating coil 16 centrally in the air-gap formed between the same direction.
  • the centering means 21 as shown is mounted upon one side of the annular pole piece 15.
  • pole centering device 22 Secured upon the outer or opposite side of the pole piece 15 we provide a pole centering device 22, which in the embodiment of our invention illustrated in Fig. 2 engages a projection 23 formed upon the end .of the inner pole piece 12.
  • This polo centering device 22 is constructed of a non-magnetic material such as brass or the like and serves to maintain the air-gap between pole pieces 12 and 15 uniform and constant.
  • an energizing coil 24 In order to energize the magnetic structure described above and to provide a suitable flux in the air-gap in which the cone actuating coil 16 operates, we provide an energizing coil 24.
  • This energizing coil 24 is shown as mounted upon the inner pole piece 12 and disposed within the conical diaphragm 17.
  • the coil 24 will be of such shape and so mounted that it will not interfere with the free movement of the coil 17, and will preferably be firmly held upon the inner pole piece in a positive manner by some suitable means.
  • a shoulder 25 upon the pole piece 12 which will serve this function. The provision of the shoulder 25, however, illustrates only one manner of securing the coil 24 in place and it is, therefore, to be understood that the shoulder 25 can be dispensed with where other means of securing the coil 24 in place are provided.
  • the inner pole supports or portions 11 of the annular member 10 are also shown as reduced in width so as to not materially interfere with the propagation of sound waves by the diaphragm 17 when it is actuated.
  • these portions 11 will have suflicient metallic cross-sectional area to carry the necessary flux, we rivet or otherwise secure thereto additional members 26 of magnetic material which, as will be readily seen, increase the magnetic cross-section of the parts at these points.
  • the annular magnetic frame 10 is provided with a rearwardly projecting flange 27, and that the magnetic frame 13 is also provided with a similar flange 28 which extends in
  • the flanges 27 and 28 upon the members 10 and 13, respectively, are preferably formed at slightly different angles upon their respective members so that when the two are drawn together as by a tightening of the screws 20, the two flanges will be drawn into close magnetic contact.
  • the flange 28 is flared outwardly, slightly so that as it is drawn into the flange 27 a tight fit will result.
  • FIG. 4 we have illustrated a modified form of centering means .for the pole piece of our improved speaker.
  • a centering means 29 of non-magnetic material which is so shaped that the projecting end 23, previously described, as provided upon the end of the inner pole piece 12 can be dispensed with.
  • centering means 29 Surrounding the depressed portion 30 the centering means 29 may be said to be bowed outwardly from the air gap so as to bridge the latter and provide a suitable space in which the cone actuating coil 16 may freely move.
  • a screw 31 is shown as passing through the centering means 29 and threaded into the end of pole piece 12.
  • a loud speaker of the moving coil type the combination of, a pair of cooperating frame members of magnetic material, a conical diaphragm held in clamped engagement between said frame members, a central pole piece upon one of saidframe members projecting axially into said diaphragm and through an opening at its apex, an annular pole piece upon the other of said frame members disposed about the end of said central pole piece, a current carrying coil secured to said diaphragm at its apex, and an energizing coil upon said central pole piece disposed within said conical diaphragm, whereby a tral pole piece forming an air gap in which a said actuating coil is disposed, and a member of non-magnetic material secured to said pole pieces and bridging said air gap for holding said polepieces in spaced relation.
  • a magnetic field structure for loud speakers of the moving coil type comprising, a relatively flat annular member of magnetic material having inwardly extending central portions, a central pole piece secured to said central therefrom, a conically shaped frame member of magnetic material cooperatin with said annular member, said latter mem r having an annular pole extremity formed at its apex which surrounds the inner end of said central pole piece, and means carried by said conical shaped frame member engaging the inner end of said central pole piece and adapted to hold said annular pole extremity in spaced relation with the end of said central pole piece.
  • a magnetic field structure for loud speakers of the moving coil type comprising, a relatively flat member of magnetic material having inwardly extending central portions, a central pole piece secured to said central portions and projecting inwardly therefrom, a frame member of magnetic material cooperat ing with said fiat member, said latter member having an annular pole extremity which surropnds the inner end of said central pole piece, and means carried by said frame member engaging the inner end of said central pole piece and adapted to hold said annular pole extremity in spaced relation with the end of said central pole piece.
  • a loud speaker of the electro-dynamic type the combination of, a central pole piece, a disc like annular pole piece extending at right angles to and surrounding one end of said central pole piece and forming an annular gap in which a diaphragm actuatmg coll may operate, a support upon one side of said annular pole piece for holdin said diaphragm actuating coil centrally in t 0 air portions and projecting inwardly

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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)
US450128A 1930-05-06 1930-05-06 Loud speaker Expired - Lifetime US1808297A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE379042D BE379042A (xx) 1930-05-06
NL32218D NL32218C (xx) 1930-05-06
US450128A US1808297A (en) 1930-05-06 1930-05-06 Loud speaker
FR715100D FR715100A (fr) 1930-05-06 1931-04-11 Perfectionnements aux haut-parleurs
GB11145/31A GB369030A (en) 1930-05-06 1931-04-15 Loud speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US450128A US1808297A (en) 1930-05-06 1930-05-06 Loud speaker

Publications (1)

Publication Number Publication Date
US1808297A true US1808297A (en) 1931-06-02

Family

ID=23786874

Family Applications (1)

Application Number Title Priority Date Filing Date
US450128A Expired - Lifetime US1808297A (en) 1930-05-06 1930-05-06 Loud speaker

Country Status (5)

Country Link
US (1) US1808297A (xx)
BE (1) BE379042A (xx)
FR (1) FR715100A (xx)
GB (1) GB369030A (xx)
NL (1) NL32218C (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423037A (en) * 1944-11-03 1947-06-24 Operadio Mfg Co Electrodynamic loud-speaker
US2537723A (en) * 1946-11-22 1951-01-09 Truvox Engineering Company Ltd Electromagnetic transducer
US4317965A (en) * 1979-04-10 1982-03-02 Kabushiki Kaisha Suwa Seikosha Thin miniaturized dynamic-type loudspeaker
WO1991006191A1 (en) * 1989-10-20 1991-05-02 Charles David Lyth Improvements in or relating to loudspeakers
US20020106101A1 (en) * 2001-02-03 2002-08-08 Kh Technology Corporation Loudspeaker assembly
USD733792S1 (en) * 2013-10-07 2015-07-07 Rony Samimrad Guitar
USD767541S1 (en) * 2014-04-23 2016-09-27 Martin Audio Limited Loudspeaker
USD783577S1 (en) * 2015-09-16 2017-04-11 Stillwater Designs And Audio, Inc. Subwoofer
USD788074S1 (en) * 2015-10-09 2017-05-30 Bose Corporation Low profile speaker

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1177210B (de) * 1962-12-14 1964-09-03 Lehner Fernsprech Signal Elektroakustischer Wandler fuer telefonische Zwecke

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423037A (en) * 1944-11-03 1947-06-24 Operadio Mfg Co Electrodynamic loud-speaker
US2537723A (en) * 1946-11-22 1951-01-09 Truvox Engineering Company Ltd Electromagnetic transducer
US4317965A (en) * 1979-04-10 1982-03-02 Kabushiki Kaisha Suwa Seikosha Thin miniaturized dynamic-type loudspeaker
WO1991006191A1 (en) * 1989-10-20 1991-05-02 Charles David Lyth Improvements in or relating to loudspeakers
US5475765A (en) * 1989-10-20 1995-12-12 Lyth; Charles D. Improvements in or relating to loudspeakers
US20020106101A1 (en) * 2001-02-03 2002-08-08 Kh Technology Corporation Loudspeaker assembly
US7016514B2 (en) 2001-02-03 2006-03-21 Kh Technology Corporation Loudspeaker assembly
USD733792S1 (en) * 2013-10-07 2015-07-07 Rony Samimrad Guitar
USD767541S1 (en) * 2014-04-23 2016-09-27 Martin Audio Limited Loudspeaker
USD783577S1 (en) * 2015-09-16 2017-04-11 Stillwater Designs And Audio, Inc. Subwoofer
USD788074S1 (en) * 2015-10-09 2017-05-30 Bose Corporation Low profile speaker

Also Published As

Publication number Publication date
FR715100A (fr) 1931-11-25
NL32218C (xx)
GB369030A (en) 1932-03-17
BE379042A (xx)

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