EP0656738A1 - Verfahren zur Herstellung von Lautsprechern und nach diesem Verfahren hergestellte Lautsprecher - Google Patents

Verfahren zur Herstellung von Lautsprechern und nach diesem Verfahren hergestellte Lautsprecher Download PDF

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Publication number
EP0656738A1
EP0656738A1 EP94308879A EP94308879A EP0656738A1 EP 0656738 A1 EP0656738 A1 EP 0656738A1 EP 94308879 A EP94308879 A EP 94308879A EP 94308879 A EP94308879 A EP 94308879A EP 0656738 A1 EP0656738 A1 EP 0656738A1
Authority
EP
European Patent Office
Prior art keywords
frame
surround
spider
coating
thermoplastic powder
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.)
Granted
Application number
EP94308879A
Other languages
English (en)
French (fr)
Other versions
EP0656738B1 (de
Inventor
Louis A. Mango Iii
Richard E. Auerbach
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.)
Harman International Industries Inc
Original Assignee
Harman International Industries Inc
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 Harman International Industries Inc filed Critical Harman International Industries Inc
Publication of EP0656738A1 publication Critical patent/EP0656738A1/de
Application granted granted Critical
Publication of EP0656738B1 publication Critical patent/EP0656738B1/de
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
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/006—Interconnection of transducer parts

Definitions

  • This invention relates to improvements in the construction of transducers. It is disclosed in the context of loudspeakers, but is believed to be useful in other applications as well.
  • metal speaker frames are plated or painted before the assembly of the moving loudspeaker components, diaphragm and voice coil, surround, and spider, into them. Then the moving components are added, illustratively by attaching them using adhesives.
  • the painting and plating processes are not as environmentally friendly as other protective coating or treating techniques.
  • the adhesives used in the assembly of speakers also contain solvents, the release of which during adhesive curing raises environmental concerns as well.
  • the application and curing of adhesives to couple the speaker frames and moving components requires additional process steps which have attendant process tolerances and failure rates. For example, a speaker frame to which adhesive has been applied may have to be set aside for a period of time until the adhesive reaches the appropriate tackiness for subsequent process steps to be conducted. This results in additional work in process.
  • a method for assembling a speaker having first and second components is provided.
  • a heat sensitive coating is applied to the first component. If it is necessary or desirable to do so, the heat sensitive coating can be fixed on the first component. This fixing can be accomplished by the application of heat to the first component either before or after application of the coating, or both, if necessary.
  • the second component is assembled to the first component, for example, by heating the second component and pressing it into intimate contact with the coated first component, or by applying heat selectively to the heat sensitive coating in areas of the first component where the second component is to be coupled to the first component, to activate the heat sensitive coating and couple the second component to the first component in those areas.
  • the heat sensitive coating comprises a powder coating or pressure molded overcoat.
  • the step of fixing the heat sensitive coating on the first component comprises the step of applying heat to the first component to which the heat sensitive coating is applied to fuse the heat sensitive coating and render it substantially continuous over the first component.
  • the first component is susceptible to corrosion, for example, oxidation.
  • the step of coating the first component with a heat sensitive coating comprises the step of coating the first component with a heat sensitive, corrosion-inhibiting coating.
  • the second component comprises at least one of a diaphragm surround, spider, terminal board, front plate, pole plate or magnetic structure.
  • the step of applying heat to the heat sensitive coating in areas of the first component where the second component is to be coupled to the first component comprises the step of applying heat to the outer perimeters of the spider and surround to couple the outer perimeters of the spider and surround to the first component.
  • the first and second components for example, a front plate and a speaker basket or frame
  • the first and second components can be heated while they are in contact with each other to activate a heat sensitive coating previously applied to one or the other or both of them.
  • one of the first and second components either a previously coated one or a previously uncoated one, can be heated and then pressed against the other component.
  • the invention may best be understood by referring to the following description and accompanying single drawing which illustrates the invention.
  • the drawing illustrates the various steps of a process conducted according to the invention, as well as a product made according to the process.
  • a loudspeaker 8 stationary component is cast, stamped, or otherwise formed from a suitable material.
  • suitable material examples include stamped steel, cast aluminum and various cast or molded filled and unfilled resins.
  • the stationary component 10 is subject to corrosion by, for example, oxygen in the air or chemicals in an environment. In others, such as when the stationary component 10 is constructed from certain filled or unfilled resins, corrosion is not a significant concern.
  • the coating 12 can be, for example, thermoplastic, and can be applied as a liquid by spraying the coating directly onto selected ones of the stationary component 10's surfaces 14.
  • the coating can also be a plastic or rubber overcoat, or the like, molded on to surfaces of the component 10 by process techniques such as transfer or injection molding.
  • the coating 12 can also be a powdered coating which is rendered fluent, for example, by the use of a fluidized bed 16.
  • the stationary component 10 can be immersed in the bed 16 of fluidized powder coating and the coating deposited upon the stationary component 10 immersed in the bed 16, or the powder can be transported from the bed 16 to a powder spray apparatus which dispenses the fluidized powder onto the stationary component 10, using electrostatic or non-electrostatic powder coating application techniques.
  • the coating 12 can, if required, be fixed to the surfaces 14 of the stationary component 10 to form a substantially continuous protective and bonding layer. If the coating 12 has been applied in liquid form, this fixing step can be conducted simply by permitting the coating 12 to air dry. Alternatively, an oven 22 drying may be conducted. If a powder coating 12 is employed, fixing may be conducted by heating 20 the stationary component 10 after introduction of the stationary component 10 into the fluidized bed 16 or spraying of the heat sensitive powder onto the surfaces of the stationary component 10 making the coating 12 more or less continuous and uninterrupted, particularly in the area(s) 24, 26 and 27 where moving component(s) of the speaker 8, for example, the surround 28 and the spider 30, will subsequently be coupled to the stationary component 10, and where the front plate 50 will be coupled to the stationary component 10.
  • the moving component(s) 28, 30 is (are) assembled into the stationary component 10 and heat is applied to the fixed heat sensitive coating 12 selectively in areas 24, 26 of the stationary component 10, here at the perimeters of the spider 30 and surround 28, where the spider 30 and surround 28 are to be coupled to the stationary component 10.
  • the heat sensitive coating 12 is thereby reactivated in these areas 24, 26 and the moving components 28, 30 are coupled to the stationary component 10 in those areas 24, 26.
  • heated staking irons 36, 38 are pressed against the perimeters 40, 42 of the surround 28 and spider 30 and the areas 24, 26 of the heat sensitive coating 12 on the stationary component 10 is activated beneath these areas 40, 42 of application of heat.
  • the heated coating 12 flows into the interstices of the surround 28 and spider 30 and is permitted to cool there, coupling the perimeters 40, 42 of the surround 28 and spider 30 to the stationary component 10 in these areas 24, 26.
  • Low density polyethylene (LDPE) was placed in a fluidized bed 16 at room temperature 22°C.
  • About fifty 6.35 cm diameter stamped steel speaker frames 10 were cleaned, iron-phosphate treated and preheated in a gas-fired oven 20 set to about 345°C.
  • the preheated frames 10 were hung on wire hooks and, while still hot, immersed in the fluidized bed 16 for times ranging from one to five seconds, with three seconds appearing to provide the optimum compromise between complete coating and coating uniformity.
  • On removal of the frames 10 from the fluidized bed 16 they were held suspended for one or two seconds and then tapped against the bed 16 tank to return non-adherent powder to the bed 16.
  • the thus-prepared speaker baskets 10 were then assembled into speakers 8.
  • Motor assembly front plates 50 were heated and pressed onto the frames 10. Terminal strips 52 permitting connections to be made to the speaker 8 motors were staked onto the frames 10.
  • the remaining stationary elements 54 of the motor structure were assembled to the front plate 50 using an activated adhesive.
  • the perimeter 42 of the spider 30 was then heat staked to the coating 12 on the back flat 26 of the speaker basket 10.
  • the perimeter 40 of the surround 28 was then heat staked to the coating 12 on the front flat 24 of the speaker basket 10.
  • thermoplastic existing component 28, 30, 50-to-basket 10 bonds may be heated for re-work purposes, if necessary, and then re-assembled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP19940308879 1993-12-03 1994-11-30 Verfahren zur Herstellung von Lautsprechern Expired - Lifetime EP0656738B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16286693A 1993-12-03 1993-12-03
US162866 1993-12-03

Publications (2)

Publication Number Publication Date
EP0656738A1 true EP0656738A1 (de) 1995-06-07
EP0656738B1 EP0656738B1 (de) 1998-01-14

Family

ID=22587451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940308879 Expired - Lifetime EP0656738B1 (de) 1993-12-03 1994-11-30 Verfahren zur Herstellung von Lautsprechern

Country Status (4)

Country Link
EP (1) EP0656738B1 (de)
JP (1) JP3292784B2 (de)
DE (1) DE69407936T2 (de)
DK (1) DK0656738T3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997007648A1 (de) * 1995-08-12 1997-02-27 Robert Bosch Gmbh Verfahren zur befestigung des zentrierteils eines konuslautsprechers
WO2017021036A1 (en) * 2015-07-31 2017-02-09 Pss Belgium Nv Audio system
CN112351377A (zh) * 2020-10-29 2021-02-09 冯勃程 一种平面扬声器振膜的制作方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2256619A1 (en) * 1973-12-28 1975-07-25 Elektroakusztikai Gyar Electro-acoustical transducer - has magnetic circuit consisting of armature(s) and magnet(s)
FR2279298A1 (fr) * 1974-07-16 1976-02-13 Sony Corp Procede de fabrication de transducteurs electro-acoustiques, et transducteurs obtenus
JPS5614796A (en) * 1979-07-16 1981-02-13 Matsushita Electric Ind Co Ltd Diaphragm for loudspeaker
JPS5720095A (en) * 1980-07-10 1982-02-02 Onkyo Corp Assembling method for speaker
JPS57212899A (en) * 1981-06-25 1982-12-27 Matsushita Electric Ind Co Ltd Manufacture for speaker
JPS59215198A (ja) * 1983-05-20 1984-12-05 Sanyo Electric Co Ltd スピ−カ振動板のエツジとフレ−ムとの結合方法
JPH04151999A (ja) * 1990-10-16 1992-05-25 Foster Electric Co Ltd トランスデューサの製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2256619A1 (en) * 1973-12-28 1975-07-25 Elektroakusztikai Gyar Electro-acoustical transducer - has magnetic circuit consisting of armature(s) and magnet(s)
FR2279298A1 (fr) * 1974-07-16 1976-02-13 Sony Corp Procede de fabrication de transducteurs electro-acoustiques, et transducteurs obtenus
JPS5614796A (en) * 1979-07-16 1981-02-13 Matsushita Electric Ind Co Ltd Diaphragm for loudspeaker
JPS5720095A (en) * 1980-07-10 1982-02-02 Onkyo Corp Assembling method for speaker
JPS57212899A (en) * 1981-06-25 1982-12-27 Matsushita Electric Ind Co Ltd Manufacture for speaker
JPS59215198A (ja) * 1983-05-20 1984-12-05 Sanyo Electric Co Ltd スピ−カ振動板のエツジとフレ−ムとの結合方法
JPH04151999A (ja) * 1990-10-16 1992-05-25 Foster Electric Co Ltd トランスデューサの製造方法

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 16, no. 435 (E - 1263) 10 September 1992 (1992-09-10) *
PATENT ABSTRACTS OF JAPAN vol. 5, no. 66 (E - 055) 2 May 1981 (1981-05-02) *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 81 (E - 107) 19 May 1982 (1982-05-19) *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 72 (E - 166) 25 March 1983 (1983-03-25) *
PATENT ABSTRACTS OF JAPAN vol. 9, no. 85 (E - 308) 13 April 1985 (1985-04-13) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997007648A1 (de) * 1995-08-12 1997-02-27 Robert Bosch Gmbh Verfahren zur befestigung des zentrierteils eines konuslautsprechers
WO2017021036A1 (en) * 2015-07-31 2017-02-09 Pss Belgium Nv Audio system
US10492004B2 (en) 2015-07-31 2019-11-26 Pss Belgium Nv Audio system
EP3634010A1 (de) * 2015-07-31 2020-04-08 PSS Belgium NV Audiosystem
CN112351377A (zh) * 2020-10-29 2021-02-09 冯勃程 一种平面扬声器振膜的制作方法

Also Published As

Publication number Publication date
DK0656738T3 (da) 1998-02-09
JPH07307996A (ja) 1995-11-21
JP3292784B2 (ja) 2002-06-17
DE69407936D1 (de) 1998-02-19
EP0656738B1 (de) 1998-01-14
DE69407936T2 (de) 1998-04-30

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