ES264871A1 - Improvements in or relating to loudspeaker diaphragms and methods for the manufacture thereof - Google Patents

Improvements in or relating to loudspeaker diaphragms and methods for the manufacture thereof

Info

Publication number
ES264871A1
ES264871A1 ES0264871A ES264871A ES264871A1 ES 264871 A1 ES264871 A1 ES 264871A1 ES 0264871 A ES0264871 A ES 0264871A ES 264871 A ES264871 A ES 264871A ES 264871 A1 ES264871 A1 ES 264871A1
Authority
ES
Spain
Prior art keywords
weight
parts
lacquer
diaphragm
resin
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
Application number
ES0264871A
Other languages
Spanish (es)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of ES264871A1 publication Critical patent/ES264871A1/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

A method of making a loudspeaker diaphragm comprises the steps of impregnating a textile fabric with a stiffening agent forming the fabric to the required shape and then coating it with a thermosetting softening-agent-free lacquer. In one example the lacquer was made by preparing a 35% by weight solution in a mixture of methyl glycol acetate, toluene and ethyl acetate of the following mixture: 7 parts by weight of an ethoxyline resin and 3 parts by weight of an urea formaldehyde resin. In another example the lacquer was made by dissolving 10 parts by weight of polyvinylformal and 4 parts by weight of a cresolformaldehyde novolak in 86 parts by weight of xylene cresol 1:1. Specification 709,397 is referred to.ALSO:In a loudspeaker diaphragm (see Division H4) made of textile material both the sound radiating part and the peripheral supporting edge are impregnated with a thermosetting resin and after the resin has been set, the sound radiating part only is further coated with a synthetic thermosetting lacquer. A textile material, e.g. cotton, nylon, polyester fibre &c., having equal warp and weft is impregnated with a thermosetting resin, e.g. phenol-formaldehyde novolak and hexamethylene tetramine in an ethanol-water mixture. When the fabric is dry it is transferred to a mould where it is heated under pressure for a short time, i.e. 10 seconds, so as to produce for example a non-deformable conical diaphragm. The periphery of this diaphragm may be grooved and may be further impregnated with a plastic substance. In order to make the sound radiating part of the diaphragm impervious to air and resistant to insects, it is coated, by immersing, spraying or brushing with a lacquer and is then heated at about 200 DEG C. for 2-15 minutes. The lacquer should be of the type used for coating wires and examples are given, i.e. ethoxyline and urea formaldehyde resins in a solution of methyl glycol acetate, toluene and ethyl acetate, or by dissolving ten parts by weight of polyvinylformal and four parts by weight of a cresolformaldehyde novolak in 86 parts by weight of xylene cresol 1 : 1. Specification 709,397 is referred to.
ES0264871A 1960-02-17 1961-02-14 Improvements in or relating to loudspeaker diaphragms and methods for the manufacture thereof Expired ES264871A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL248534 1960-02-17

Publications (1)

Publication Number Publication Date
ES264871A1 true ES264871A1 (en) 1961-07-16

Family

ID=19752186

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0264871A Expired ES264871A1 (en) 1960-02-17 1961-02-14 Improvements in or relating to loudspeaker diaphragms and methods for the manufacture thereof

Country Status (4)

Country Link
CH (1) CH392627A (en)
DE (1) DE1154516B (en)
ES (1) ES264871A1 (en)
GB (1) GB966603A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8301653A (en) * 1983-05-10 1984-12-03 Philips Nv ELECTRO-ACOUSTIC CONVERTER WITH AN AIR-PERMISSIBLE MEMBRANE.
GB2538809B (en) * 2015-05-29 2021-08-25 B & W Group Ltd Loudspeaker diaphragm

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE691930C (en) * 1933-08-11 1940-06-08 Telefunken Gmbh Seamless small diaphragm, dynamically driven on the outer edge, of conical or dome shape for funnel loudspeakers
US2302178A (en) * 1940-11-12 1942-11-17 Joseph B Brennan Acoustic diaphragm
US2408038A (en) * 1941-12-10 1946-09-24 Joseph B Brennan Article made of fibrous material
DE806861C (en) * 1948-11-23 1951-06-18 Gottlob Widmann & Soehne K G E Membrane for loudspeakers and moving coil microphones
US2873813A (en) * 1955-07-27 1959-02-17 Hawley Products Co Acoustic diaphragm and method of construction

Also Published As

Publication number Publication date
GB966603A (en) 1964-08-12
DE1154516B (en) 1963-09-19
CH392627A (en) 1965-05-31

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