GB787424A - Improvements relating to loudspeakers and the like - Google Patents

Improvements relating to loudspeakers and the like

Info

Publication number
GB787424A
GB787424A GB10037/53A GB1003753A GB787424A GB 787424 A GB787424 A GB 787424A GB 10037/53 A GB10037/53 A GB 10037/53A GB 1003753 A GB1003753 A GB 1003753A GB 787424 A GB787424 A GB 787424A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
cambric
deposit
fibres
cement
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
GB10037/53A
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.)
ALFRED HAROLD WHITELEY
WHITELEY ELECTRICAL RADIO COMP
Original Assignee
ALFRED HAROLD WHITELEY
WHITELEY ELECTRICAL RADIO COMP
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 ALFRED HAROLD WHITELEY, WHITELEY ELECTRICAL RADIO COMP filed Critical ALFRED HAROLD WHITELEY
Priority to GB10037/53A priority Critical patent/GB787424A/en
Priority to US422866A priority patent/US2818130A/en
Publication of GB787424A publication Critical patent/GB787424A/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
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • H04R7/125—Non-planar diaphragms or cones comprising a plurality of sections or layers comprising a plurality of superposed layers in contact

Landscapes

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

Abstract

787,424. Making electroacoustic diaphragms. WHITELEY ELECTRICAL RADIO CO., Ltd., and WHITELEY, A. H. April 12, 1954 [April 13, 1953], No. 10037/53. Class 87(2). [Also in Group XXXIX] A diaphragm for an electroacoustic device is made by a process comprising the steps of (i) lightly impregnating a sheet of open woven linen or cotton cambric with a hardenable synthetic resin. (ii) Forming the sheet to the shape of the diaphragm required, as shown in Fig. 1, in a heated press, the resin being cured to the point where the sheet has acquired a substantial degree of permanent stiffness. (iii) Passing through the permeable fabric, by suction or pressure, a suspension of fibres in water, so depositing a layer of fibrous pulp. The fibres are beaten to a small size and include those of cotton, sisal, wood pulp and cellulose. Different materials may be deposited at different parts of the conical axes 10, to break up resonances which may tend to occur, or the thickness of the deposit may be varied locally for the same purpose, or holes can be cut in the cambric if desired. (iv) Applying heat and pressure to the fibre with the wet deposit in a press similar to that used in step (ii) but with at least one face covered with metal gauze to allow steam to escape. (v) Allowing the deposit to dry and coating the deposited area with a cement to bond the fibres of the deposit to those of the cambric. The cement can be of the solvent type and/or of a type including a .thermoplastic or thermosetting material, a cellulose stoving enamel being suitable. (vi) Allowing the solvent to evaporate and again placing the diaphragm in a heated press. Alternatively, but less desirably, the cement may be included in the liquid suspension to shorten the process. The surround 11 is coated with material to seal the interstices in the cambric, e.g. rubber solution, to prevent sound radiation. To assemble the diaphragm in a loudspeaker, Fig. 5, the disc 14 in the centre of the diaphragm is pushed out and a coil support 17, with coil 18, is attached to it. A centring spider 19, which may be made in the same way as the diaphragm, is cemented to the assembly, which is then mounted in a housing 20 with the coil in the air gap of a magnetic structure 21.
GB10037/53A 1953-04-13 1953-04-13 Improvements relating to loudspeakers and the like Expired GB787424A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB10037/53A GB787424A (en) 1953-04-13 1953-04-13 Improvements relating to loudspeakers and the like
US422866A US2818130A (en) 1953-04-13 1954-04-13 Loudspeaker diaphragms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10037/53A GB787424A (en) 1953-04-13 1953-04-13 Improvements relating to loudspeakers and the like

Publications (1)

Publication Number Publication Date
GB787424A true GB787424A (en) 1957-12-11

Family

ID=9960304

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10037/53A Expired GB787424A (en) 1953-04-13 1953-04-13 Improvements relating to loudspeakers and the like

Country Status (2)

Country Link
US (1) US2818130A (en)
GB (1) GB787424A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2908115A1 (en) * 1979-03-02 1980-09-04 Braun Ag Broadband loudspeaker with moving coil support - which is fixed to rigid cylindrical sound-radiating component
GB2144600A (en) * 1983-08-04 1985-03-06 Standard Telephones Cables Ltd Electro-acoustic transducer

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2922851A (en) * 1957-05-10 1960-01-26 Gen Dynamics Corp Loudspeakers
US3328537A (en) * 1964-01-09 1967-06-27 Hecht William High frequency sound translating device
US3563336A (en) * 1969-05-23 1971-02-16 Ben O Key Horn speaker

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2017496A (en) * 1930-12-24 1935-10-15 Jesse B Hawley Method of making sound reproducing diaphragms
US2006830A (en) * 1930-12-24 1935-07-02 Jesse B Hawley Sound reproducing diaphragm
US2087441A (en) * 1935-06-17 1937-07-20 Columbian Rope Co Laminated fibrous structure and method of producing same
US2152901A (en) * 1936-09-05 1939-04-04 F W Manning Company Ltd Method of making filter fabric
US2146975A (en) * 1936-11-06 1939-02-14 Nagelvoort Adriaan Acoustic diaphragm
US2206517A (en) * 1938-04-06 1940-07-02 Fides Gmbh Electroacoustic apparatus
BE482081A (en) * 1945-11-08
US2596364A (en) * 1946-09-09 1952-05-13 Joseph B Brennan Method of preparing a blank for a conically shaped diaphragm
US2549091A (en) * 1946-10-25 1951-04-17 Bell Telephone Labor Inc Diaphragm for electroacoustic transducers
US2624417A (en) * 1947-02-20 1953-01-06 Joseph B Brennan Acoustic diaphragm with flexible rim portion and rigid body portion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2908115A1 (en) * 1979-03-02 1980-09-04 Braun Ag Broadband loudspeaker with moving coil support - which is fixed to rigid cylindrical sound-radiating component
GB2144600A (en) * 1983-08-04 1985-03-06 Standard Telephones Cables Ltd Electro-acoustic transducer

Also Published As

Publication number Publication date
US2818130A (en) 1957-12-31

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