US3819876A - Loudspeaker with improved voice coil support - Google Patents

Loudspeaker with improved voice coil support Download PDF

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Publication number
US3819876A
US3819876A US00286527A US28652772A US3819876A US 3819876 A US3819876 A US 3819876A US 00286527 A US00286527 A US 00286527A US 28652772 A US28652772 A US 28652772A US 3819876 A US3819876 A US 3819876A
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US
United States
Prior art keywords
bobbin
voice coil
loudspeaker
ribbon
terminals
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
US00286527A
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English (en)
Inventor
S Kinoshita
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
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 claimed from JP8032771U external-priority patent/JPS5228521Y2/ja
Priority claimed from JP8032871U external-priority patent/JPS5228522Y2/ja
Priority claimed from JP8032971U external-priority patent/JPS5122665Y2/ja
Priority claimed from JP8032671U external-priority patent/JPS5122664Y2/ja
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Application granted granted Critical
Publication of US3819876A publication Critical patent/US3819876A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

  • a loudspeaker comprising a voice coil bobbin with a voice coil wound around its periphery is disposed in an annular gap formed between a columnar pole and a plate surrounding said pole.
  • a plurality of terminals are mounted on the plate so that they are distributed on the circumference of a circle concentric with respect to the axis of said bobbin and mounted rotatably about their respective axes which are in parallel with the axis of said bobbin, with the terminals being coupled through suspension wires to the bobbin.
  • the suspension wires may be of high resiliency, and have a layer of viscous resilient material surrounding the same.
  • the voice coil bobbin of a loudspeaker may comprise a cylindrical body with a voice coil wound around its periphery, plural turns of a heat-resisting ribbon member impregnated with the thermosetting adhesives provided around the cylindrical body with the voice coil strip metal pieces inserted in between turns of the ribbon around the cylindrical body and aligned in the circumferential direction with a certain spacing left between respective ones so that both ends of each strip metal piece, project from the side edges of the ribbon, wherein projecting ends of the strip metal pieces are folded as to lie on the ribbon outer turn and thesefolded portions are heated to harden the thermosetting adhesives to fix the metal pieces to the ribbon.
  • a loudspeaker device having an improved structure by which it provides superior sound characteristics relative to, such as, frequency and directivity, and which brings no deviation in sound reproduction characteristic between individual products.
  • FIG. I is a fragmentary, perspective view of a main portion of a loudpseaker forming one embodiment of the present invention.
  • FIG. 2 is a partial, cross sectional view of a portion of the loudspeaker of FIG. 1.
  • FIG. 3 is a fragmentary, perspective view of the main portion of a loudspeaker forming a second embodiment of the present invention.
  • FIG. 4 is an elevational, cross sectional view of a portion of the loudspeaker of FIG. 3.
  • FIG. 5 is a fragmentary, perspective view of a main portion of a loudspeaker forming yet a third embodiment of the present invention.
  • FIG. 6 is a fragmentary, perspective view of a main portion of a loudspeaker forming a fourth embodiment of the present invention.
  • FIG. 7 is a side elevational view, a portion of which is partially enlarged, of a voice coil bobbin forming a portion of the embodiment of FIG. 5.
  • FIG. 7A is an enlarged sectional view of the connection for the bobbin of FIG. 7.
  • FIG. 8A is a perspective view of the voice coil bobbin of FIG. 6 during an initial stage of manufacture.
  • FIG. 8B is a perspective view of the voice coil bobbin of FIG. 8A after being partially wound.
  • FIG. 8C is a completed voice coil bobbin subsequent to manufacture by the process partially illustrated in FIGS. 8A and 88.
  • numeral 1 designates an annular magnet, wherein a discal yoke 2 is secured on one end face of the magnet I and an annular plate 3 is secured on the other end face of the same, a columnar pole 4 is secured on the yoke 2 so as to provide an annular gap of a predetermined width'between its peripheral surface and the inner periphery of the plate 3, and a magnetic circuit is formed by the aforementioned members.
  • a cylindrical voice coil bobbin 6 which has a voice coil 5 woumd around its periphery.
  • the cylindrical assembly consisting of the bobbin 6 and the voice coil 5 wound therearound has an inner diameter slightly larger than the diameter of the pole 4 and an outer diameter slightly smaller than the inner periphery of the plate 3, and is disposed so as to be able to move freely axially within the gap formed between the pole 4 and the plate 3.
  • numeral 7 designates a dome-shape diaphragm attached to one end of the bobbin 6.
  • a plurality of flanges 8 of a substantially cylindrical shape (in the illustrated device, the number is three) are secured. Respective flanges 8 are distributed and positioned on the circumference of a circle concentric with respect to the axis of the pole 4 with a certain spacing left between respective flanges.
  • a center hole 8a formed in the upper surface of the flange as shown in FIG. 2, a threaded portion 9a of one end of a terminal 9 is inserted; and a nut 10 is screwed at that end.
  • a flat washer 11 and an insulating washer 12 Between the terminal 9 and the upper surface of the flange 8 there are interposed a flat washer 11 and an insulating washer 12, while between the nut 10 and the lower surface of the flange 8 there are interposed a spring washer 13, a flat washer l4 and an insulating washer 15. If the nut 10 is screwed on the order of compression that the spring washer 13 is not compressed fully, the terminal 9 can rotate about its axis while being insulated electrically from the flange 8. It should be noted that a slit 9b having appropriate width and depth is formed at the top of the terminal 9.
  • a suspension wire 16 is inserted at one end in the slit 9b of the terminal 9 and secured thereto through a suitable process such as brazing.
  • Wire 16 has a high resiliency and is made of material such as beryllium-copper alloy. This suspension wire 16 extends in a tangential direction, and terminates against the outer periphery of the bobbin 6 and is secured at one end to a terminal 17 attached on the bobbin 6.
  • the bobbin 6 is held in a certain position relative to the pole 4, the terminal 9 is rotated about its axis so that the opposite end of the suspension wire 16 attached to the terminal 9 will contact the corresponding terminal 17 of the bobbin 6, then the suspension wire 16 is brazed to terminal 17.
  • the bobbin 6 may be held in the correct position where the axis of the bobbin lies on the axis of the pole 4 resulting in the intended sound characteristics.
  • each terminal 9 is bonded onto the flanges 8, respectively.
  • the numeral 1 designates an annular magnet, wherein a discal yoke 2 is secured on one end face of the magnet l and an annular plate 3 is secured on the other end face of the same, a columnar pole 4 is secured on the yoke 2 so as to provide an annular gap of a predetermined width between its peripheral surface and the inner periphery of the plate 3, and a magnetic circuit is formed by the afore-mentioned members.
  • a cylindrical voice coil bobbin 6 is disposed which has a voice coil 5 wound around its periphery.
  • the cylindrical assembly consisting of the bobbin 6 and the voice coil 5 wound therearound has an inner diameter slightly larger than the diameter of the pole 4 and an outer diameter slightly smaller than the inner periphery of the plate 3, and is disposed so as to be able to move freely in the axial directions within the gap formed between the pole 4 and the plate 3.
  • numeral 7 designates a dome-shape diaphragm attached to one end of the bobbin 6.
  • a plurality of tying projections 29 (in the illustrated device, the number is three), are mounted by means of appropriate supporting members 28. Respective projections 29 are distributed on the circumference of a circle concentric with respect to the axis of the pole 4 and, as shown in FIG. 2, suspension wires 30 are secured at their respective stem portions to the tops of the projections through suitable fixing processes such as brazing.
  • the suspension wire 30 extends in a tangential direction with respect to the outer periphery of the bobbin 6 and a contact portion is fixed to a terminal 31 attached on the bobbin 6. According to the above arrangement, the bobbin 6 can be supported resiliently in a certain position by the three suspension wires 30.
  • each suspension wire 30 is provided at its stem end portion with a layer 32 of viscous resilient material so that it surrounds the end portion.
  • This viscous resilient layer 32 may be made of suitable viscous resilient material such as silicone-rubber and absorbs vibration of the suspension wire 30 made of high resilient material such as beryllium-copper alloy to thereby prevent resonance of the latter.
  • the voice call bobbin 6 is supported only by a plurality of suspension wires 30 extending in the tangential directions with respect to the bobbin 6, a preferably linearity is preserved in relation to an input signal to the voice coil 5 even in the case the bobbin 6 vibrates in its axial directions with a large amplitude. Further, even when the suspension wire 30 seems to provide the tendency that it resonates itself in response to vibration of the bobbin 6, the viscous resilient layer 32 surrounding the wire effectively absorbs vibration of the suspension wire 10, so that there results little deterioration of the frequency and transient characteristics which normally results from resonance of the suspension wire 30.
  • the vibration absorbing effect of the viscous resilient layer 32 is more efi'ective if the shape of the viscous resilient layer 32 is selected so that it is thick at the stem end portion of the suspension wire 30 and becomes gradually thin as it approaches the pointed end portion of the same.
  • dome-type loudspeaker is illustrated, it will be clear that the present invention can be applied to a cone-type loudspeaker.
  • numeral 1 designates an annular magnet, wherein a discal yoke 2 is secured on one end face of the magnet l and an annular plate 3 is secured on the other end face of the same, a columnar pole 4 is secured on the yoke 2 so as to provide an annular gap of a predetermined width between its peripheral surface and the inner periphery of the plate 3, and a magnetic circuit is formed by the afore-mentioned members.
  • a cylindrical voice coil bobbin 6 is disposed which has a voice coil 5 wound around its periphery.
  • the cylindrical assembly consisting of the bobbin 6 and the voice coil 5 wound therearound has an inner diameter slightly larger than the diameter of the pole 4 and an outer diameter slightly smaller than the inner periphery of the plate 3, and is disposed so as to be able to move freely in the axial directions within the gap formed between the pole 4 and the plate 3.
  • numeral 7 designates a dome-shape diaphragm attached to one end of the bobbin 6.
  • Respective projections 29 are positioned and distributed on the circumference of a circle concentric with respect to the axis of the pole 4, to the tops of these projections are stem portions of suspension wires 30' secured through suitable fixing processes such as brazing.
  • the suspension wire 30' extends in a tangential direction with respect to the outer periphery of the bobbin 6 and is secured at its contact point with the periphery to a terminal 31 attached on the bobbin 6. According to the foregoing arrangement, the bobbin 6 is maintained in a proper position resiliently by three suspension wires 30.
  • the voice coil bobbin 6 is supported only by plural suspension wires 30 extending in tangential directions relative to the bobbin periphery, so that the device preserves a sufficient linearity with respect to the input signal to the voice coil even when the bobbin 6 vibrates in its axial directions with a large amplitude.
  • the suspension wire 30 is bent to give an appropriate curvature in a plane parallel to the axis of the bobbin 6, the advantages will result that the compliance of the bobbin 6, in the direction of oscillation increases, the property of resisitvity against flexing of the same in directions normal to the vibration directions increases too, and transversal rocking of the bobbin 6 is prevented. Furthermore, if the projections 29 are kept in an electrically insulated state relative to the plate 3, and one end of the voice coil 5 and the other are connected, respectively, to one of the terminals 31 and another of the remaining terminals 31, it is possible to use the suspension wires 30 as take-out leads of the voice coil 5. In this case, wires 30' are not coated with viscous material as in FIG. 3.
  • numeral 1 designates an annular magnet, wherein a discal yoke 2 is secured on one end face of the magnet l and annular plate 3 is secured on the other end face of the same, a columnar pole 4 is secured on the yoke 2 so as to provide an annular gap of a predetermined width between its peripheral surface and the inner periphery of the plate 3, and a magnetic circuit is formed by the afore-mentioned members.
  • a cylindrical voice coil bobbin 6 is disposed which has a voice coil 5 wound around its periphery.
  • the cylindrical 'assembly consisting of the bobbin 6 and the voice coil 5 wound therearound is disposed in a gap between the inner periphery of the plate 3 and the periphery of the pole 4 and resiliently supported by the plate 3 through a plurality of suspension wires 37 (in the illustrated device, the number is three) aligned in tangential directions so that the assembly can move in the axial directions.
  • FIGS. 7, 8A, 8B and 8C show an example ofthe steps of attaching the metal pieces 38 to the bobbin 6.
  • thermosetting adhesives such as epoxy resin containing a setting agent
  • thermosetting adhesives such as epoxy resin containing a setting agent
  • one end of which is secured at an appropriate position on the outer periphery of the bobbin 6 through the process of hardening portions of the thermosetting adhesives by use of appropriate heating means such as a soldering iron 40 as shown in FIG. 8A.
  • the ribbon member 9 fixed at one end to the bobbin 6 is wound around the bobbin 6 so as to form a first turn, and than a second turn is provided during which strip metal pieces 38 made of such as thin copper plate are disposed between the turns so that both ends of each piece project from the side edges of the ribbon member 39.
  • the other end of it is heated and bonded on the bobbin 6 (FIGS. 8B and 8C).
  • the metal piece 38 after being folded at both end portions so that they wrap the ribbon member 39 positioned thereon, is secured to the ribbon member 39 by thermosetting adhesives processed by appropriate heating means (FIG. 7).
  • the metal pieces 38 and the ribbon member 39 are rigidly secured, respectively, to the ribbon member 39 and the bobbin 6, and, even if the bobbin 38 is made of electrically conductive material, each metal piece 38 is electrically insulated from the other pieces and from the bobbin 36. Tops of the suspension wires 37 are secured to these metal pieces 38 through processes such as brazing.
  • thermosetting adhesives it is more effective to heat the bobbin after the afore-mentioned process in a heating oven in a range of a temperature permitting no damage to it for acting thermosetting adhesives.
  • the bobbin 6 and suspension wires 37 are very rigidly coupled one to another, as a result, the coupling portions will wear little even when the bobbon 6 vibrates heavily and suffers little secular variation.
  • a loudspeaker having a cylindrical voice coil bobbin with a voice coil wound about its periphery and disposed within an annular gap formed by a columnar magnetic pole and an annular plate surrounding said pole and spaced radially therefrom, the improvement comprising:
  • suspension wires made of a highly resilient material and extending volutely and tangentially to the bobbin and coupled respectively at their ends to said bobbin and to end portions of said terminals,
  • each of said suspension wires being curved within a plane parallel to the axis of the bobbin

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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)
US00286527A 1971-09-04 1972-09-05 Loudspeaker with improved voice coil support Expired - Lifetime US3819876A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP8032771U JPS5228521Y2 (enrdf_load_stackoverflow) 1971-09-04 1971-09-04
JP8032871U JPS5228522Y2 (enrdf_load_stackoverflow) 1971-09-04 1971-09-04
JP8032971U JPS5122665Y2 (enrdf_load_stackoverflow) 1971-09-04 1971-09-04
JP8032671U JPS5122664Y2 (enrdf_load_stackoverflow) 1971-09-04 1971-09-04

Publications (1)

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US3819876A true US3819876A (en) 1974-06-25

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US00286527A Expired - Lifetime US3819876A (en) 1971-09-04 1972-09-05 Loudspeaker with improved voice coil support

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US (1) US3819876A (enrdf_load_stackoverflow)
DE (1) DE2243427A1 (enrdf_load_stackoverflow)
FR (1) FR2151124B1 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909557A (en) * 1972-06-20 1975-09-30 Pioneer Electronic Corp Vibration dampening mounting system for wire suspended loudspeaker bobbin
WO1994016536A1 (en) * 1993-01-06 1994-07-21 Velodyne Acoustics, Inc. Speaker containing dual coil
US6757403B2 (en) * 2000-03-16 2004-06-29 Star Micronics Co., Ltd. Electroacoustic transducers
US20080310669A1 (en) * 2007-06-15 2008-12-18 Aurasound, Inc. Wire suspension for speakers
US20130051605A1 (en) * 2011-08-22 2013-02-28 Sony Corporation Speaker device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983337A (en) * 1973-06-21 1976-09-28 Babbco, Ltd. Broad-band acoustic speaker

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1907687A (en) * 1929-09-03 1933-05-09 Rca Corp Coil supporting spider
US1960016A (en) * 1933-04-07 1934-05-22 Rca Corp Sound translating device
GB607594A (en) * 1943-03-27 1948-09-02 Alberto Laffon Y Soto Improvements in the suspension of the movable element of electro-dynamic loud-speakers
GB776280A (en) * 1954-05-26 1957-06-05 Cole E K Ltd Improvements in or relating to moving coil loudspeakers and microphones
GB889967A (en) * 1957-03-13 1962-02-21 Rola Celestion Ltd Improvements in or relating to electro-acoustic transducers
US3095942A (en) * 1959-01-23 1963-07-02 Wilfred E Thibodean Sonic vibrator
US3518460A (en) * 1968-10-30 1970-06-30 Euphonics Corp Ultrasonic transducer employing suspended piezoelectric plate

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1907687A (en) * 1929-09-03 1933-05-09 Rca Corp Coil supporting spider
US1960016A (en) * 1933-04-07 1934-05-22 Rca Corp Sound translating device
GB607594A (en) * 1943-03-27 1948-09-02 Alberto Laffon Y Soto Improvements in the suspension of the movable element of electro-dynamic loud-speakers
GB776280A (en) * 1954-05-26 1957-06-05 Cole E K Ltd Improvements in or relating to moving coil loudspeakers and microphones
GB889967A (en) * 1957-03-13 1962-02-21 Rola Celestion Ltd Improvements in or relating to electro-acoustic transducers
US3095942A (en) * 1959-01-23 1963-07-02 Wilfred E Thibodean Sonic vibrator
US3518460A (en) * 1968-10-30 1970-06-30 Euphonics Corp Ultrasonic transducer employing suspended piezoelectric plate

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909557A (en) * 1972-06-20 1975-09-30 Pioneer Electronic Corp Vibration dampening mounting system for wire suspended loudspeaker bobbin
WO1994016536A1 (en) * 1993-01-06 1994-07-21 Velodyne Acoustics, Inc. Speaker containing dual coil
US5832096A (en) * 1993-01-06 1998-11-03 Velodyne Acoustics, Inc. Speaker containing dual coil
US6757403B2 (en) * 2000-03-16 2004-06-29 Star Micronics Co., Ltd. Electroacoustic transducers
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
US20130051605A1 (en) * 2011-08-22 2013-02-28 Sony Corporation Speaker device
US8798309B2 (en) * 2011-08-22 2014-08-05 Sony Corporation Speaker device with a magnetic gap filled with magnetic fluid and changing magnetic flux density in axial and circumferential direction
RU2595649C2 (ru) * 2011-08-22 2016-08-27 Сони Корпорейшн Громкоговоритель
US9462392B2 (en) 2011-08-22 2016-10-04 Sony Corporation Speaker device with a magnetic gap filled with magnetic fluid and changing magnetic flux density in axial and circumferential directions

Also Published As

Publication number Publication date
FR2151124A1 (enrdf_load_stackoverflow) 1973-04-13
FR2151124B1 (enrdf_load_stackoverflow) 1979-02-09
DE2243427A1 (de) 1973-04-12

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