US3833771A - Electro-acoustic transducers - Google Patents

Electro-acoustic transducers Download PDF

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Publication number
US3833771A
US3833771A US00364486A US36448673A US3833771A US 3833771 A US3833771 A US 3833771A US 00364486 A US00364486 A US 00364486A US 36448673 A US36448673 A US 36448673A US 3833771 A US3833771 A US 3833771A
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US
United States
Prior art keywords
frame members
transducer
diaphragm
flanges
magnet
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
US00364486A
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English (en)
Inventor
J Collinson
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.)
WHARFEDALE Ltd
Original Assignee
Rank Organization Ltd
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Filing date
Publication date
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Publication of US3833771A publication Critical patent/US3833771A/en
Assigned to WHARFEDALE LIMITED reassignment WHARFEDALE LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RANK ORGANISATION PLC, THE
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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
    • H04R9/046—Construction
    • H04R9/047—Construction in which the windings of the moving coil lay in the same plane
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
    • G01L11/04—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by acoustic means

Definitions

  • the inwardly directed flanges serve to define the spacing between the magnet structure and the diaphragm when two such frames are assembled with the diaphragm therebetween and the magnet structures located by the upstanding peripheral flanges of the frame members which flanges project away from one another.
  • the two frame members are clamped along at least two sides in correspondence with the inwardly directed flanges, and the clamping means also holds the magnet structures and a perforated backing plate onto the frame members.
  • an audio transducer comprises two frame members each in the form of a closed polygon having an inwardly directed flange extending around at least part of the periphery thereof and a further flange forming an upstanding wall extending around the periphery thereof, at least one nonmetallic diaphragm carrying a metallic conductor formed as a plurality of spaced, parallel, series connected strips located between and separating the frame members which are disposed with the upstanding walls projecting away from one another, two fixed magnet structures,.each resting on the said inwardly directed flanges within the upstanding wall of respective frame elements and each having a plurality of parallel spaced elongated magnet poles facing the diaphragm aligned with the spaces between the strips of conductor with adjacent poles being of opposite polarity, and a perforated metallic backing sheet in contact with the face of the magnet remote from the diaphragm, and means holding all the said components of the transducer clamped together along at least two sides of the said frame members
  • Two treble diaphragms and a full range diaphragm interposed between them may be provided between the frame elements.
  • the magnet may consist of a perforated sheet of plastomagnetic material or of individual strips of plastomagnetic material as defined.
  • the perforated sheet or the individual strips may be formed of stacked laminations.
  • the magnet and thebacking sheet associated with each frame element may be fastened'to one another by adhesive.
  • Each frame element may be formed with pins projecting from selected co-planar flanges towards and penetrating the other frame elementthe corresponding co-planar flanges of which are formed with holes penetrated by the pins, the backing sheets and it may be the
  • the diaphragm may be similarly perforated for passage of the pins.
  • the tips of at least two opposite upstanding walls of each element may be inwardly bent over the outer surface of the associated magnet unit to hold the magnet unit in place, the heels of the angle bars of the two frame elements, i.e. the outside corners where the flanges meet, being fastened to one another with the diaphragm held between the two elements.
  • the frame elements may be of thermoplastics material, e.g., polystyrene, the pins or the walls being deformed following the application of heat. Similarly the two frame elements may be heat sealed to one another. To facilitate heat sealing the co-planar flanges of the angle bars may extend rearwardly beyond the heels of the bars so that the extended portions may be heated and fused together without distorting the adjacent portions of the frame elements.
  • thermoplastics material e.g., polystyrene
  • the backing sheets may be of mild steel and may be cadmium plated.
  • the diaphragm may be of a non-metallic material such as Melinex.-
  • the conductor strip on the diaphragm may be of aluminium and the ends may be located adjacent to one another at one edge of the diaphragm so as to be readily engageable by a connecting plug, gaps being provided in the co-planar flanges to receive the plug magnets also being formed with similarly located holes for passage of the pins, the projecting ends of which are deformed to form rivet heads holding the one frame element with its magnet unit to the other frame element with its magnet unit with the diaphragm clamped between the frame elements.
  • FIG. 1 is an exploded view of what may for convenience be considered the upper frame element and its associated magnet and backing sheet of one form of transducer assembly
  • FIG. 2 is an exploded view of what may for convenience be referred to as the lower frame element with its associated magnet and backing sheet of the said transducer assembly including the diaphragm
  • FIG. 3 is a section through the centre of the assembled transducer which is the subject of FIGS. 1 and 2
  • FIG. 4 is a section through the assembled transducer at the position marked 4-4 in FIGS. 1 and 2 showing how the pins lock the two frame elements and their associated components to one another
  • FIG. 5 is a perspective view showing another form of transducer assembly
  • FIG. 6 is a plan view of the transducer of FIG. 5
  • FIG. 7 is a section through the line 7-7 in FIG. 6 before the frame elements are heat sealed together
  • FIG. 8 is a section through the line 88 in FIG. 6 showing the tips of the upstanding flangesbent over the magnet units and the frame elements heat sealed to one another to hold all the components in rigid clamped relationship.
  • FIG. 1 denotes frame elements each consisting of a number of angle bars 2 disposed in the form of a closed polygon, in the illustrated construction a quadrilateral, one flange 3 of each angle bar 2 being coplanar with a flange 3 of each other angle bar 2 and the other flanges 4 forming an upstanding wall.
  • 5 denotes a diaphragm of non-metallic material carrying a metallic conductor 6 in the form of a strip having spaced parallel portions.
  • the magnets 7 denotes magnets formed with perforations 8 and so magnetized as to provide the effect of a plurality of strip magnets, adjacent strips being of opposite polarity, the magnets 7 being formed of plastomagnetic material consisting of magnetic particles emnotes perforated metallic backing sheets in contact with the rear faces of the magnets 7 and serving the dual purpose of mechanical supports for the magnets and low reluctance paths for the magnetic flux of the magnets.
  • the perforations in the sheet 9 are arranged to register with the perforations 8 in the magnet 7 when the magnet 7 and the sheet 9 are placed together to form a magnet unit.
  • 1t denotes pins projecting outwardly from the co-planar flanges 3, said flanges being formed with holes 11, the pins 10 and the holes 11 being so located that when the upper frame element is applied to the lower frame element the pins 10 of the one frame-element penetrate the holes 11 in the other frame element.
  • the diaphragm 5, the magnet 7 and the sheet 9 are also formed with holes 12 so spaced that these holes can be penetrated by both sets of pins 10 on the upper and the lower frame elements.
  • FIGS. 5, 6, 7 and 8 the two frame elements are assembled the same as in the con-. struction of FIGS. 1 to 4 but in this case the tips 4A of one pair of opposite upstanding flanges 4 are heated and bent inwardly so that they engage the outer faces of the sheets 9 thus retaining the magnet units within the respective frame elements, also, the projecting heels 3A of the angle bars are heat fused to one another to hold the two frame elements to one another with the diaphragm 5 gripped between them. It will be observed that in this embodiment the diaphragm is gripped at two opposite edges only and is free along the other two opposite edges. This greatly reduces artificial damping of the diaphragm.
  • corner pegs 13 are fitted into the said open gaps and project a short distance inwardly beyond the said flanges 3.
  • the plug 14 providing an electrical connection to the ends of the conductor 6 may be attached to the diaphragm 5 to provide an electrical connection to the conductor 6 before the diaphragm 5 is placed in position, the plug resting in the gap 38 in the co-planar flanges 3. lt will be understood of course that if desired the conductor 6. may be arranged to project beyond the confines of the frame elements 1 so that a separate external connection may be made to the conductor 6.
  • the construction of FIGS. 5 to 7 may similarly accommodate an internal plug or an external plug if desired.
  • the construction of the invention provides the advantages of easy assembly without requiring ahigh degree of skill because tlie necessary spacing of the magnets and the diaphragm is provided by the thickness of the co-planar flanges 3, these flanges being made of the required thickness to provide the desired degree of spacing.
  • the construction also provides a completely rigid unit able to resist quite rough treatment.
  • an audio transducer of the type comprising:
  • non-magnetic diaphragm with aconductor on at least one face thereof, the conductor being formed as a plurality of elongate, parallel, series connected strips, 7
  • a magnet structure presenting a plurality of elongate magnetic poles aligned with the spaces between the parallel strips of said conductor, adjacent poles having opposite polarity whereby the magnetic field produced thereby extends substantially parallel to the plane of the diaphragm and orthogonal to the direction of said strips of said conductor where it intersects said conductor, and
  • 'a frame structure comprising two frame members in the form of respective closed polygons, said frame members having inwardly directed flanges defining the separation between said diaphragm and said two magnet structures, and furtherupstanding flanges defining an upstanding wall extending around the periphery of said frame members, said'upstanding wall having a height at least as great as the combined thickness of the associated said magnet structure and backing plate, and
  • magnet structures each incorporate a perforated sheet of plasto-magnetic material, that is a material consisting of magnetic particles embedded in a matrix of nonmagnetic material.
  • said magnet structures include a plurality of individual strips of plasto-magnetic material, that is a material consisting of magnetic particles embedded in a matrix upon magnetic material.
  • said frame members are formed of a thermoplastics material with an outwardly projecting lip coplanar with said at least and fused together without distorting the adjacent portions of said frame members which are thereby heat sealed to one another.
  • transducer of claim 1 wherein at least one of said inwardly directed flanges of each said frame member is provided with gaps in corresponding positions to define, when said two frame members are located together, an opening to receive a plug for connecting the two ends of said conductor strip on said diaphragm to a source of electrical supply when said transducer is assembled.
US00364486A 1972-05-26 1973-05-29 Electro-acoustic transducers Expired - Lifetime US3833771A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2496072A GB1428405A (en) 1972-05-26 1972-05-26 Electro-acoustic transducers

Publications (1)

Publication Number Publication Date
US3833771A true US3833771A (en) 1974-09-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00364486A Expired - Lifetime US3833771A (en) 1972-05-26 1973-05-29 Electro-acoustic transducers

Country Status (8)

Country Link
US (1) US3833771A (de)
JP (1) JPS4951929A (de)
AT (1) AT318032B (de)
DE (1) DE2327143A1 (de)
FR (1) FR2189973A1 (de)
GB (1) GB1428405A (de)
IT (1) IT986369B (de)
NL (1) NL7307357A (de)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898598A (en) * 1974-01-24 1975-08-05 Foster Tsushin Kogyo Dynamic electroacoustic transducer
US4471173A (en) * 1982-03-01 1984-09-11 Magnepan, Inc. Piston-diaphragm speaker
US4471172A (en) * 1982-03-01 1984-09-11 Magnepan, Inc. Planar diaphragm transducer with improved magnetic circuit
US4480155A (en) * 1982-03-01 1984-10-30 Magnepan, Inc. Diaphragm type magnetic transducer
US5430805A (en) * 1990-12-27 1995-07-04 Chain Reactions, Inc. Planar electromagnetic transducer
US5815290A (en) * 1995-08-31 1998-09-29 Samsung Electronics Co., Ltd. Guide apparatus of contact image sensor
US6175636B1 (en) 1998-06-26 2001-01-16 American Technology Corporation Electrostatic speaker with moveable diaphragm edges
US6188772B1 (en) 1998-01-07 2001-02-13 American Technology Corporation Electrostatic speaker with foam stator
US6304662B1 (en) 1998-01-07 2001-10-16 American Technology Corporation Sonic emitter with foam stator
US20020076069A1 (en) * 1998-01-07 2002-06-20 American Technology Corporation Sonic emitter with foam stator
US20020118856A1 (en) * 2001-01-26 2002-08-29 American Technology Corporation Planar-magnetic speakers with secondary magnetic structure
US20020191808A1 (en) * 2001-01-22 2002-12-19 American Technology Corporation Single-ended planar-magnetic speaker
US20050100181A1 (en) * 1998-09-24 2005-05-12 Particle Measuring Systems, Inc. Parametric transducer having an emitter film
US7564981B2 (en) 2003-10-23 2009-07-21 American Technology Corporation Method of adjusting linear parameters of a parametric ultrasonic signal to reduce non-linearities in decoupled audio output waves and system including same
US8199931B1 (en) 1999-10-29 2012-06-12 American Technology Corporation Parametric loudspeaker with improved phase characteristics
US8275137B1 (en) 2007-03-22 2012-09-25 Parametric Sound Corporation Audio distortion correction for a parametric reproduction system
US20130266160A1 (en) * 2012-04-09 2013-10-10 Aac Microtech (Changzhou) Co.,Ltd. Coil
US8767979B2 (en) 2010-06-14 2014-07-01 Parametric Sound Corporation Parametric transducer system and related methods
US8903104B2 (en) 2013-04-16 2014-12-02 Turtle Beach Corporation Video gaming system with ultrasonic speakers
US8934650B1 (en) 2012-07-03 2015-01-13 Turtle Beach Corporation Low profile parametric transducers and related methods
US8958580B2 (en) 2012-04-18 2015-02-17 Turtle Beach Corporation Parametric transducers and related methods
US8988911B2 (en) 2013-06-13 2015-03-24 Turtle Beach Corporation Self-bias emitter circuit
US9036831B2 (en) 2012-01-10 2015-05-19 Turtle Beach Corporation Amplification system, carrier tracking systems and related methods for use in parametric sound systems
US9332344B2 (en) 2013-06-13 2016-05-03 Turtle Beach Corporation Self-bias emitter circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6008714A (en) * 1997-11-13 1999-12-28 Okuda; Masanao Thin-Structured electromagnetic transducer
CN105357623B (zh) * 2015-11-10 2018-03-27 重庆夏朗科技有限公司 一种华司、磁铁和铆钉装配方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164686A (en) * 1959-09-21 1965-01-05 Tibbetts Industries Electrodynamic transducer
US3674946A (en) * 1970-12-23 1972-07-04 Magnepan Inc Electromagnetic transducer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164686A (en) * 1959-09-21 1965-01-05 Tibbetts Industries Electrodynamic transducer
US3674946A (en) * 1970-12-23 1972-07-04 Magnepan Inc Electromagnetic transducer

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898598A (en) * 1974-01-24 1975-08-05 Foster Tsushin Kogyo Dynamic electroacoustic transducer
US4471173A (en) * 1982-03-01 1984-09-11 Magnepan, Inc. Piston-diaphragm speaker
US4471172A (en) * 1982-03-01 1984-09-11 Magnepan, Inc. Planar diaphragm transducer with improved magnetic circuit
US4480155A (en) * 1982-03-01 1984-10-30 Magnepan, Inc. Diaphragm type magnetic transducer
US5953438A (en) * 1990-12-27 1999-09-14 Chain Reactions, Inc. Planar electromagnetic transducer
US5430805A (en) * 1990-12-27 1995-07-04 Chain Reactions, Inc. Planar electromagnetic transducer
US5815290A (en) * 1995-08-31 1998-09-29 Samsung Electronics Co., Ltd. Guide apparatus of contact image sensor
US6188772B1 (en) 1998-01-07 2001-02-13 American Technology Corporation Electrostatic speaker with foam stator
US6304662B1 (en) 1998-01-07 2001-10-16 American Technology Corporation Sonic emitter with foam stator
US20020076069A1 (en) * 1998-01-07 2002-06-20 American Technology Corporation Sonic emitter with foam stator
US6175636B1 (en) 1998-06-26 2001-01-16 American Technology Corporation Electrostatic speaker with moveable diaphragm edges
US20050100181A1 (en) * 1998-09-24 2005-05-12 Particle Measuring Systems, Inc. Parametric transducer having an emitter film
US8199931B1 (en) 1999-10-29 2012-06-12 American Technology Corporation Parametric loudspeaker with improved phase characteristics
US7142688B2 (en) 2001-01-22 2006-11-28 American Technology Corporation Single-ended planar-magnetic speaker
US20020191808A1 (en) * 2001-01-22 2002-12-19 American Technology Corporation Single-ended planar-magnetic speaker
US20070127767A1 (en) * 2001-01-22 2007-06-07 American Technology Corporation Single-ended planar-magnetic speaker
US20060050923A1 (en) * 2001-01-26 2006-03-09 American Technology Corporation Planar-magnetic speakers with secondary magnetic structure
US20090097693A1 (en) * 2001-01-26 2009-04-16 Croft Iii James J Planar-magnetic speakers with secondary magnetic structure
US20020118856A1 (en) * 2001-01-26 2002-08-29 American Technology Corporation Planar-magnetic speakers with secondary magnetic structure
US6934402B2 (en) 2001-01-26 2005-08-23 American Technology Corporation Planar-magnetic speakers with secondary magnetic structure
US7564981B2 (en) 2003-10-23 2009-07-21 American Technology Corporation Method of adjusting linear parameters of a parametric ultrasonic signal to reduce non-linearities in decoupled audio output waves and system including same
US8275137B1 (en) 2007-03-22 2012-09-25 Parametric Sound Corporation Audio distortion correction for a parametric reproduction system
US9002032B2 (en) 2010-06-14 2015-04-07 Turtle Beach Corporation Parametric signal processing systems and methods
US8767979B2 (en) 2010-06-14 2014-07-01 Parametric Sound Corporation Parametric transducer system and related methods
US8903116B2 (en) 2010-06-14 2014-12-02 Turtle Beach Corporation Parametric transducers and related methods
US9036831B2 (en) 2012-01-10 2015-05-19 Turtle Beach Corporation Amplification system, carrier tracking systems and related methods for use in parametric sound systems
US20130266160A1 (en) * 2012-04-09 2013-10-10 Aac Microtech (Changzhou) Co.,Ltd. Coil
US8934658B2 (en) * 2012-04-09 2015-01-13 Aac Acoustic Technologies (Shenzhen) Co., Ltd. Coil
US8958580B2 (en) 2012-04-18 2015-02-17 Turtle Beach Corporation Parametric transducers and related methods
US8934650B1 (en) 2012-07-03 2015-01-13 Turtle Beach Corporation Low profile parametric transducers and related methods
US8903104B2 (en) 2013-04-16 2014-12-02 Turtle Beach Corporation Video gaming system with ultrasonic speakers
US8988911B2 (en) 2013-06-13 2015-03-24 Turtle Beach Corporation Self-bias emitter circuit
US9332344B2 (en) 2013-06-13 2016-05-03 Turtle Beach Corporation Self-bias emitter circuit

Also Published As

Publication number Publication date
AT318032B (de) 1974-09-25
GB1428405A (en) 1976-03-17
FR2189973A1 (de) 1974-01-25
NL7307357A (de) 1973-11-28
DE2327143A1 (de) 1973-12-06
JPS4951929A (de) 1974-05-20
IT986369B (it) 1975-01-30

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Date Code Title Description
AS Assignment

Owner name: WHARFEDALE LIMITED, WHARFEDALE WORKS, HIGHFIELD RO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RANK ORGANISATION PLC, THE;REEL/FRAME:004331/0203

Effective date: 19831220