US3909557A - Vibration dampening mounting system for wire suspended loudspeaker bobbin - Google Patents

Vibration dampening mounting system for wire suspended loudspeaker bobbin Download PDF

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Publication number
US3909557A
US3909557A US370189A US37018973A US3909557A US 3909557 A US3909557 A US 3909557A US 370189 A US370189 A US 370189A US 37018973 A US37018973 A US 37018973A US 3909557 A US3909557 A US 3909557A
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United States
Prior art keywords
bobbin
loudspeaker
wire
periphery
air gap
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
US370189A
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English (en)
Inventor
Shouzo Kinoshita
Shinichi Ishikawa
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.)
Pioneer Corp
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Pioneer Electronic Corp
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Filing date
Publication date
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
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Publication of US3909557A publication Critical patent/US3909557A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
    • 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
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering
    • H04R9/042—Centering by pressurised air

Definitions

  • This invention relates to loudspeakers of the type wherein a voice coil bobbin having a voice coil wound about the bobbin periphery is disposed within a cylindrical air gap formed within the loudspeaker magnetic circuit, and more particularly, to such a loudspeaker, where a plurality of suspension wires extend tangentially to the periphery of the bobbin and are fixed at their ends, respectively, to the bobbin periphery and to the annular plate of the magnetic circuit which partially defines the cylindrical air gap.
  • a plurality of suspension wires are distributed in uniformly spaced circumferential manner and extend in a tangential direction to the outer periphery of the bobbin and are fixed at one end to the bobbin and at the other end to an annular plate or the like which partially defines the circular air gap within which the bobbin is positioned.
  • Loudspeakers in which the bobbin is suspended by wires of this type have great merit in terms of the sound characteristics of the loudspeaker in comparison with loudspeakers using bobbin suspension means other than the tangential wires.
  • the present invention is directed to a loudspeaker which employs a cylindrical bobbin having a voice coil wound about its periphery with the bobbin disposed within a cylindrical air gap of the magnetic circuit and suspended by a plurality of suspension wires which extend tangentially to the outer periphery of the bobbin and are fixed at one end to the periphery of the bobbin and at the other end to a fixed magnetic annular plate which forms a part of the magnetic circuit and partially defines the cylindrical air gap.
  • the improvement comprises a mass of viscous resilient material which surrounds the ends of the wire at their point of attachment to the annular plate and, in fact, acts as the means for fixing the outer ends of the wires to the annular plate.
  • FIG. 1 is a perspective view, partially cut away, of a loudspeaker incorporating the wire suspension means of the present invention, in one form.
  • FIG. 2 is a sectional, elevational view of a portion of the loudspeaker of FIG. 1.
  • annular magnet l is associated with a disca] yoke 2 which is secured on one end face of magnet 1 while an annular magnetic plate 3 is secured on the other end face of the same magnet l and cooperates with a columnar pole which is secured to the yoke 2 so as to define with the annular plate 3, an annular or cylindrical air gap ofa predetermined width.
  • the air gap is defined by the inner periphery of the plate 3 and the periphery of pole 4.
  • a cylindrical voice coil bobbin 6 Positioned in concentric manner about the upper end of pole 4, is a cylindrical voice coil bobbin 6 which has a voice coil 5 wound about its periphery in conventional manner.
  • the cylindrical assembly consisting of bobbin 6 and voice coil 5 wound thereabout has an inner diameter slightly larger than the diameter of pole 4 and an outer diameter slightly smaller than the inner periphery of the plate 3 and is disposed such that it is able to move freely in an axial direction within the air gap formed between the pole 4 and plate 3.
  • Numeral 7 designates a cup-shaped diaphragm which is attached to the end of bobbin 6 remote from pole 4.
  • suspension wires 8 are circumferentially spaced at equal distance about bobbin 6 and extend generally tangentially with respect to the periphery of the bobbin.
  • Each suspension wire 8 is made of a material having a high resiliency such as berrylium-copper alloy.
  • the suspension wires 8 extend in a tangential direction with predetermined spacing between the suspension wires.
  • One end of the suspension wire 8 is secured to the outer peripheral surface of the bobbin through a suitable connecting member 9, while the end portion of the wire is fixed to the upper surface of plate 3 by a mass of viscous resilient material 10 which completely surrounds the inner end of the wire 8 at its point of attachment to plate 3.
  • Viscous material 10 may be silicone rubber.
  • a shift in position of the attachment point 8' of wire 8 to the bobbin 6 is readily seen by contrasting the initial full line position to the dotted line position of one of the wires 8, FIG. 2.
  • the improvement comprising: a mass of viscous resilient damping material surrounding the outer end of each wire and solely fixing each wire outer end to said annular plate for suppressing movement of said wires along their axes and for dampening rotative movement of said bobbin.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US370189A 1972-06-20 1973-06-14 Vibration dampening mounting system for wire suspended loudspeaker bobbin Expired - Lifetime US3909557A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972072182U JPS5253220Y2 (enrdf_load_stackoverflow) 1972-06-20 1972-06-20

Publications (1)

Publication Number Publication Date
US3909557A true US3909557A (en) 1975-09-30

Family

ID=27971023

Family Applications (1)

Application Number Title Priority Date Filing Date
US370189A Expired - Lifetime US3909557A (en) 1972-06-20 1973-06-14 Vibration dampening mounting system for wire suspended loudspeaker bobbin

Country Status (2)

Country Link
US (1) US3909557A (enrdf_load_stackoverflow)
JP (1) JPS5253220Y2 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080310669A1 (en) * 2007-06-15 2008-12-18 Aurasound, Inc. Wire suspension for speakers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1966564A (en) * 1928-04-05 1934-07-17 Schlenker Vesper Anderson Dynamic sound reproducer
US3518460A (en) * 1968-10-30 1970-06-30 Euphonics Corp Ultrasonic transducer employing suspended piezoelectric plate
US3819876A (en) * 1971-09-04 1974-06-25 Pioneer Electronic Corp Loudspeaker with improved voice coil support

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1966564A (en) * 1928-04-05 1934-07-17 Schlenker Vesper Anderson Dynamic sound reproducer
US3518460A (en) * 1968-10-30 1970-06-30 Euphonics Corp Ultrasonic transducer employing suspended piezoelectric plate
US3819876A (en) * 1971-09-04 1974-06-25 Pioneer Electronic Corp Loudspeaker with improved voice coil support

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080310669A1 (en) * 2007-06-15 2008-12-18 Aurasound, Inc. Wire suspension for speakers
US8155372B2 (en) * 2007-06-15 2012-04-10 Donald North Wire suspension for speakers

Also Published As

Publication number Publication date
JPS4931341U (enrdf_load_stackoverflow) 1974-03-18
JPS5253220Y2 (enrdf_load_stackoverflow) 1977-12-02

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