US1702926A - Loud-speaker - Google Patents

Loud-speaker Download PDF

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Publication number
US1702926A
US1702926A US86123A US8612326A US1702926A US 1702926 A US1702926 A US 1702926A US 86123 A US86123 A US 86123A US 8612326 A US8612326 A US 8612326A US 1702926 A US1702926 A US 1702926A
Authority
US
United States
Prior art keywords
veneer
diaphragm
sheet
sheets
paper
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
US86123A
Other languages
English (en)
Inventor
Alfred H Bartsch
Marcus C Hopkins
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.)
Ambac International Corp
Original Assignee
American Bosch Magneto Corp
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
Priority to BE340130D priority Critical patent/BE340130A/xx
Application filed by American Bosch Magneto Corp filed Critical American Bosch Magneto Corp
Priority to US86123A priority patent/US1702926A/en
Application granted granted Critical
Publication of US1702926A publication Critical patent/US1702926A/en
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
    • 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

Definitions

  • This invention relates to loud speakers and particularly to that type which embodies the use of a large conical diaphragm.
  • the diaphragm of cone type loud speakers is usually made of some fibrous material such as paper, impregnated cloth or the like.
  • a conical diaphragm constructed at least partly of thin wood produces superior results. For instance, a conical diaphragm so constructed gives a very pleasing, soft and mellow tone to the reproduced sound. Moreover, the appearance of the loud speaker is greatly improved.
  • Japanese wood veneer in the construction of the diaphragm.
  • This veneer is well suited for the purpose.
  • This veneer is obtainable in the form of thin sheets of wood ranging from about .00075 of an inch to about .001 of an inch in thickness, cemented to a tissue paper backing of about the same thickness, making the total thickness ofthe layer of wood and the backing range from about .0015 of an inch to .002 of an inch.
  • Japanese wood veneer is so thin that a diaphragm constructed of it would not be self-supporting unless an impractical number of layers were used.
  • W'e therefore, apply the veneer to a fibrous support or filler such as manila paper or craft paper by cementing one or more layers of the Japanese veneer to either one or both sides of the paper support in the manner hereinafter described more in detail.
  • the composite sheet thus produced is formed into a cone preferably by cutting a sector from it and then folding the sheet to conical form and uniting the radial seam by gluing, stitching or the like.
  • Figs. 1 to 3 are respectively a front elevation, a side elevation and a rear elevation of the loud speaker;
  • Fig. 4 is a vertical transverse section of the speaker
  • the type of speaker disclosed inthe drawlngs comprises a conical diaphragm 1 secured at its edge portion to the periphery of a dished sheet metal member 2.
  • the sheet metal member 2 is in turn supported by a pedestal 3.
  • the electromagnetic mechanism for actuating the cone is denoted in general at eland is preferably attached to and car-' ing applications of Marcus C.- I-Iopkins. J
  • the present invention pertains more particularly to the diaphragm per se, and to a loud speaker of general characteristics having a diaphragm of the particular construction herein disclosed.
  • the preferred way of constructing the diaphragm is to employ asheet of manila or craft paper and to cement or glue the I Japanese wood veneer to the sheet of pa er in any one of the various ways illustrate in Fi s; 5 to 8 inclusive.
  • Figs. 5 and 5* the Japanese wood veneer is applied to only one side of the paper support.
  • the paper support is indicated at 8 and the Japanese wood veneer at 9 and 9', 9 being the wood veneer proper and 9' being the tissue paper backing to which the veneer roper is cemented.
  • the combined sheet including the veneer 9 and the tissue paper backing 9 is glued directly to one face of the paper support 8.
  • Fig. 5 shows in perspective a portion of the paper support 8 with the superposed layers of wood veneer 9 and tissue paper backing 9; and this figure also shows the graining on the veneer at 10.
  • two layers of the J apanese veneer are glued to one face of the wood veneer are preferably dispose back to back, that is, with the tissue paper backing 9 of one sheet abutting the tissue paper backing of the other sheet.
  • the two sheets of Japanese veneer maybe cemented or glued to each other and then glued to the paper support 8, or one sheet ofthe J apanese wood veneer may be glued to the paper support and then the other sheet of Japanese veneer glued to the sheet first applied.
  • a sheet of Japanese veneer 9, 9' is applied to each face of the paper support 8.
  • Fig. 8 two sheets of veneer 9, 9' are applied to each face of the paper support 8 and preferabl the two sheets of veneer on each-side of t e paper support 8 are placed back to back as described in connection-with Fig. 6.
  • the same system of applying the veneer to the paper support 8 may be followed as descr1bed in connection with-Fig. 6. That. is, the veneer sheets at each side of the (paper support 8 may be cemented or glue in place successively or the two sheets at one side of the. paper support 8 may be first glued or cemented together and then a plied to the paper support.
  • two sl ieets of veneer are emplo ed at each side of the paper support as 1n ig58, the grain of the two sheets on one side of the paper.
  • support may run in the same direction and be isposed at right angles to the grain of the two sheets at the other side of the paper
  • the sheets of veneer are so applied that the grain of each sheet runs at ri t angles to the rain of the next adjoining sheet as illustrate in Fig. 8.
  • the grains of the two sheets at one side of the pa or support 8 are at right angles it is probab y immaterial whether the grains of the two inside sheets adjacent the paper support 8 are at right angles with respect-to each other or in the same direction.
  • Any number of sheets of veneer may be applied either to one or both sides of the paper support following the various methods outlined above, provided the total thickness of the composite diaphragm does not exceed practical limits.
  • the wood veneer'which we employ is so thin that a diaphragm conto .008 of an inch making the total thickness of the composite diaphragm shown in inc to about .012 0 an inch.
  • a diaphragm constructed as above described may be mounted in the sheet metal member 2 by providing the diaphra' m near its outer edge with' a circumferentia crease 11 to form a forwardly flaring brim portion 12.
  • the sheet metal member 2 is provided with a corresponding offset forward- Figs 7 and 7 ran e from about .01 of any member 2 otherwise the conical portion of.
  • the diaphragm would not be sufliciently free
  • the best results are hadto vibrate axiall by securing the rim 12 of the diaphragm to the sheet metal member 2 throu bout a part only of its width as shown in ig'. 4 as this gives the cone substantial freedom for axialv movement.
  • the outer layer of veneer may have a quick drying stain applied thereto to bring out and accentuate the graining in the woodthereby giving the loud speaker a very leasing appearance.
  • the stain employed ,s ould not have a tendency to clo' the pores between the fibers' of the woo A very thin coating of wax may be' applied over the stain to protectthe veneer. d
  • a lend speaker having a direct acting conical diaphragm ef fibrous inetei-isi and at least ene adherent facing of thin Wood veneer on least (me side of said e1iephzragm said Wood Veneer a thickness rang"- ing 20m about .00035 e2? inch to sbeut 01 0f em inch,

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US86123A 1926-02-05 1926-02-05 Loud-speaker Expired - Lifetime US1702926A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE340130D BE340130A (enrdf_load_stackoverflow) 1926-02-05
US86123A US1702926A (en) 1926-02-05 1926-02-05 Loud-speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86123A US1702926A (en) 1926-02-05 1926-02-05 Loud-speaker

Publications (1)

Publication Number Publication Date
US1702926A true US1702926A (en) 1929-02-19

Family

ID=22196419

Family Applications (1)

Application Number Title Priority Date Filing Date
US86123A Expired - Lifetime US1702926A (en) 1926-02-05 1926-02-05 Loud-speaker

Country Status (2)

Country Link
US (1) US1702926A (enrdf_load_stackoverflow)
BE (1) BE340130A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122314A (en) * 1976-12-23 1978-10-24 Sony Corporation Loudspeaker having a laminate diaphragm of three layers
FR2598843A1 (fr) * 1986-05-15 1987-11-20 Centre Nat Rech Scient Structure composite pour table d'harmonie d'instruments a cordes et son procede de fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122314A (en) * 1976-12-23 1978-10-24 Sony Corporation Loudspeaker having a laminate diaphragm of three layers
FR2598843A1 (fr) * 1986-05-15 1987-11-20 Centre Nat Rech Scient Structure composite pour table d'harmonie d'instruments a cordes et son procede de fabrication

Also Published As

Publication number Publication date
BE340130A (enrdf_load_stackoverflow)

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