US1888532A - Diaphragm for loud speakers - Google Patents

Diaphragm for loud speakers Download PDF

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Publication number
US1888532A
US1888532A US565887A US56588731A US1888532A US 1888532 A US1888532 A US 1888532A US 565887 A US565887 A US 565887A US 56588731 A US56588731 A US 56588731A US 1888532 A US1888532 A US 1888532A
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US
United States
Prior art keywords
diaphragm
loud speakers
rib
trough
section
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
US565887A
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English (en)
Inventor
Hultstrom David Carl Alfred
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US1888532A publication Critical patent/US1888532A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • 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
    • H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed

Definitions

  • This invention relates to a diaphragm for loud speakers in the form of a trough, of part cylindrical shape for example, open or r closed at the ends.
  • the diaphragm is stiffened by at least one internal or external rib extending across the curved surface of the trough transversely to the longitudinal direction thereof. Owing to the construction corresponding to this invention a loud reproduction of notes of any pitch is obtained. Objectionable subsidiary vibrations are prevented.
  • the diaphragm according to the 1nvention can be made of particularly large area, since the vibrations therein are transmitted uniformly to all parts of the diap-hragm.
  • Figure 2 a plan of this constructional form.
  • Figure 3 shows a cross section through a modified constructional form.
  • Figure 4 a cross section through a third constructional form
  • Figure 5 a section on the line V-V in Figure 4 on a larger scale for greater stiffness.
  • the diaphragm a which has the shape of a segment of a cylinder, is secured in a box 7), by means of clamping strips 0 and screws d.
  • the clamping strips press plane extensions a, of the trough shaped diaphragm against rims e on the box Z).
  • the diaphragm a is provided with a high rib g, which extends over it transversely.
  • the rib may consist for example of plywood. It is essential that it should be light and sufficiently stifi.
  • To the rib is secured the control needle h for the diaphragm. An example of a method of fastening the needle will be further described with reference to Figure 5.
  • the diaphragm should be smooth, that is to say, not pleated or rib bed, in order that the cylindrical trough shape, in co-operation with the rib, may yield a satisfactory stiffening of the diaphragm, thus ensuring a satisfactory propagation of the oscillations right to the outermost edges of the diaphragm. It is also important that by the method of securing the diaphragm an alteration in the length of the chord of the cylindrical segment under the influence of the oscillations should be guarded against, even at the parts of the diaphragm farthest away from the rib.
  • the felt support there may be secured to the end walls of the box Z), opposite to the lateral edges of the diaphragm, strips of cloth or the like, which serve the same purpose as the felt strips f in the constructional form according to Figures 1 and 2, that is to say, they are intended to guard against scraping noise when the diaphragm is vibrating.
  • the cloth strips might alternatively be secured to the edge of the diaphragm.
  • the diaphragm might be arranged behind a sounding wall or might even be free.
  • the diaphragm might even be of such a shape that its radius of curvature varies in a periphoral or in a longitudinal direction.
  • the rib g is secured to the convex side of the diaphragm, in the constructional form according to Figure 4 it is secured to the concave side. Furthermore in the constructional form according to Figure 4, the thin rib is reinforced at its edges, that is, at for instance by applying ply-wood frames.
  • the rib might be formed with apertures for the purpose of diminishing its weight and therefore its inertia.
  • FIG. 5 the method of securing the control needle k is illustrated.
  • a screwthreaded extension k on the control needle goes through a bore in the reinforced margin 9 of the rib.
  • a transverse bore 2' In the adjacent thin portion of the rib 9, close to the thickened margin 9 is formed a transverse bore 2', in which is arranged a nut is screwed on to the extension k
  • the edges of the reinforced margin 9 are capped by small U-shaped sheet-metal clips, in order to present a good bearing surface for the nut is and for a collar m provided on the needle h.
  • a diaphragm for loud speakers comprising a trough-shaped body curved in section, and at least one stiffening rib extending in the peripheral direction about the curved surface of the body and disposed transversely to the longitudinal direction of the latter.
  • a diaphragm for loud speakers comprising a trough-shaped body partly cylindrical in section, and at least one stiffening rib extending in the peripheral direction about the curved surface of the body and disposed transversely to the longitudinal direction of the latter.
  • a diaphragm for loud speakers comprising a trough-shaped body curved in section and having open ends, and at least one stiffening rib extending in the peripheral direction about the curved surface of the body and disposed transversely to the longitudinaldirection of the latter.
  • a diaphragm for loud speakers comprising a trough-shaped body partly cylindrical in section and having open ends, and at least one stiffening rib extending in the peripheral direction about the curved surface of the body and disposed transversely to the longitudinal direction of the latter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US565887A 1930-03-14 1931-09-29 Diaphragm for loud speakers Expired - Lifetime US1888532A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1888532X 1930-03-14

Publications (1)

Publication Number Publication Date
US1888532A true US1888532A (en) 1932-11-22

Family

ID=7747706

Family Applications (1)

Application Number Title Priority Date Filing Date
US565887A Expired - Lifetime US1888532A (en) 1930-03-14 1931-09-29 Diaphragm for loud speakers

Country Status (3)

Country Link
US (1) US1888532A (en(2012))
FR (1) FR713224A (en(2012))
NL (1) NL32898C (en(2012))

Also Published As

Publication number Publication date
FR713224A (fr) 1931-10-23
NL32898C (en(2012))

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