GB717148A - Diaphragms for loud speakers - Google Patents

Diaphragms for loud speakers

Info

Publication number
GB717148A
GB717148A GB8021/52A GB802152A GB717148A GB 717148 A GB717148 A GB 717148A GB 8021/52 A GB8021/52 A GB 8021/52A GB 802152 A GB802152 A GB 802152A GB 717148 A GB717148 A GB 717148A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
lacquer
foam
foamed
skins
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
GB8021/52A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB717148A publication Critical patent/GB717148A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/08—High-leakage transformers or inductances
    • H01F38/085—Welding transformers
    • 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
    • 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
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact

Abstract

Cellular moulded loudspeaker diaphragms, which are 0.8 to 3 mm thick may be made from synthetic resin lacquers foamed by the addition of inflating agents. The cells in the foam have a diameter of the order of 1 mm. and the specific gravity of the diaphragm lies between 0.1 and 0.3. Synthetic resins specified are phenol-formaldehyde and urea-formaldehyde condensates, silicones, polymethacrylates, and polystyrene. The inflation is limited by moulds permeable to steam. Hardening agents may be added. Very small fine threads, fibres or flakes of various materials, e.g. mica, anthracite, alummium-oxide, boron carbide, and light metals, may be added. The diaphragm may be made even thinner if it has a light supporting framework of net, fabric, or perforated material of not more more than 10 per cent. of the weight of the diaphragm. Thin strong skins, such as paper, are preferably applied to both sides of the diaphragm. These skins may be of foil or sprayed metal and are sufficiently foam-and liquid-proof to prevent baking to the mould. Further stiffening may be obtained by mica scales cemented by lacquer to the surface or embedded therein. Foamed lacquer may be spread, sprayed, or rolled uniformly on to an impermeable foam-proof support. In all cases the lacquer is heated quickly and cooled quickly. Instead of inflating agents, volatile or water soluble substances may be used and after removal of these the walls are reinforced by saturation with dilute lacquers and subsequent drying.
GB8021/52A 1951-04-09 1952-03-28 Diaphragms for loud speakers Expired GB717148A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE717148X 1951-04-09

Publications (1)

Publication Number Publication Date
GB717148A true GB717148A (en) 1954-10-20

Family

ID=6626620

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8021/52A Expired GB717148A (en) 1951-04-09 1952-03-28 Diaphragms for loud speakers

Country Status (5)

Country Link
BE (1) BE510411A (en)
CH (1) CH328490A (en)
DE (1) DE886798C (en)
FR (1) FR1059899A (en)
GB (1) GB717148A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE960123C (en) * 1951-04-18 1957-04-04 Siemens Ag Device for current control in arc welding transformers
US2905260A (en) * 1955-02-24 1959-09-22 Muter Company Loud speaker diaphragm
US3111187A (en) * 1959-11-23 1963-11-19 H J Leak & Company Ltd Diaphragm for electro acoustic transducer
US3164221A (en) * 1961-06-06 1965-01-05 Rosen Alfred H Low frequency loudspeaker system

Also Published As

Publication number Publication date
BE510411A (en)
DE886798C (en) 1953-07-02
CH328490A (en) 1958-03-15
FR1059899A (en) 1954-03-29

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