US1763053A - Loud-speaker - Google Patents

Loud-speaker Download PDF

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Publication number
US1763053A
US1763053A US159553A US15955327A US1763053A US 1763053 A US1763053 A US 1763053A US 159553 A US159553 A US 159553A US 15955327 A US15955327 A US 15955327A US 1763053 A US1763053 A US 1763053A
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US
United States
Prior art keywords
board
diaphragm
resonator
loud speaker
sound
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
US159553A
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English (en)
Inventor
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.)
TITANAFRAM Corp
Original Assignee
TITANAFRAM 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
Application filed by TITANAFRAM CORP filed Critical TITANAFRAM CORP
Priority to US159553A priority Critical patent/US1763053A/en
Priority to GB31/28A priority patent/GB283210A/en
Priority to FR646683D priority patent/FR646683A/fr
Application granted granted Critical
Publication of US1763053A publication Critical patent/US1763053A/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

Definitions

  • The'present invention relates to loud speak ers of the type disclosed in my copending application, SeriaLNo. 77,033, tiled December 22, 1925, as being suitable for use with radio receiving sets or as announcers for telephone, and linewire circuits.
  • the loud speaker' disclosed in thatl application comprises a relatively light and stili' diaphragm or tympanum preferably conical in shape and a sound board or -resonator having greater mass than that of the central diaphragm.
  • connection between the diaphragm and the resonator or sound board is such that the diaphragm will respond to relatively high sound frequencies and will effectively reproduce the high tones or sounds, and will also transmit relatively low frequencies through said connection to the sound board so that it will respond to the relatively low frequencies and will effectively riproduce them.
  • ⁇ ,lt is the principal obJect of the invention there disclosetl and claimed to provide a highly efficient loud speaker capable of regenerating or reproducing sound waves directly in free air wit-hout distortion as in a horn or other amplifying device, the sound so regenerated retaining substantially the. same balance of high and low tones as the original sound from which the actuating force was derived.
  • the principal object of the present invention is to provide a loud speaker of the foregoing type having a resonator of corrugated board an'd by this term l intend to include products of the type now commonly used in thev manufacture of cartons and packing" boxes, and comprising one or more plane sheets of cardlmard reinforced and stitfened by one-or more sheets of corrugatei'l cardboard.
  • the selection of a material suitable for use a: sound board or resonator in a loud speaker of the type above identilied is not an easy matter.
  • the weight. of the material is of importance and must be coordinated to the weight and size of the tvmpanum or diaphragm and to the power available for actuating that tympanum or diaphragm.
  • corrugated cardboard will serve my purpose well, for it has the advantage that it is cheap in cost, easy to shape into the desired forin, is relatively resistant ⁇ to moisture. is free from warping and will withstand rough treatment during shipment and in the hands of the ultimate user. Most importantof all, it has proper acoustical properties when assembled with a sound board or a paper cone to be actuated by a radio receiving set.
  • Figure l is a front elevation
  • Figure 2 is a vertical section of the loud speaker shown in Fig. 1;
  • Figure 3 is a rear elevation
  • Figure 4 is a plan view
  • Figure 5 is a fragmentary section through the sound board showing its multi-ply structure.
  • the loud speaker comprises a conical diaphragm or tympanum 1 coupled to a vibratory resonator or sound board 2 by means of a flexible coupling or hinge shown in Fig. 3.
  • the conical diaphragm 1 is preferably made of cover paper cut and folded to shape and glued on a radial seam. Near the outer edge of the cone thus formed the paper is creased and then folded up to form a forwardly Haring brim 3. 'l ⁇ his brim naturallyassumes an angle to the plane of the base of the cone equal to the angle between the radial elements of the cone and that base.
  • the outer edge portion of the brim 3 is preferably glued to' the inner circular beveled edge of the resonator or sound board 2.
  • the necessary beveling or tapering of the inner circular edge of the sound board as shown at 4 can readily be produced as a part of the punch press operation 'whereby the sounding board is stamped out ot a fiat panel.
  • the inner edge portion of the brim 3 seats upon and is glued to the tapering surface thus formed.
  • gluing or cementing the brim to the beveled edge 4 it is important that a part of the brim be left free to form a hinge on which the cone may fioat.
  • the cemented portion may have a Width of 1/4 more or less and the remainder of the brim may be left free to swing.
  • the resonator or sound board 2 in accordance with this invention is made of corrugated board and inthe embodiment here illustrated that board is of the kind commonly used by makers of cartons and shipping cases. It comprises a plane front lamination 5, a plane rear lamination 6 and an interposed corrugated lamination 7 glued alonof its edges to the plane boards. The outer edge of the annular sound board thus formed can be bound with a ring or band 8 of paper or Wood glued in place.
  • the vibratory actuating force is applied to the apex of the conical diaphragm by means of a rod or wire 9 which is adapted to be maintained in fixed relation to the diaphragm by means of a set screw 10.
  • the rod 9 may be actuated by electromagnetic mechanism. housed in a casing 11.
  • the casing 11 may be attached to a support or spider 12 which in turn may be affixed to the resonator or sound board by bolts 13.
  • the loud speaker may be conveniently supported by suspending it on cords attached to the spider
  • a loud speaker comprising ⁇ a conical diaphragm and a resonator of corrugated board arranged adjacent the diaphragm and adapted to be. actuated thereby.
  • a loud speaker consisting essentially of a central diaphragm and a sound reproducing rim of corrugated board surrounding said diaphragm.
  • a loud speaker comprising a central conical diaphragm and a sound reproducing rim ofcorrugated hoard surrounding the diaphragm and connected thereto to permit the diaphragm. to respond to relatively high frequencies and the sound reproducing rim to respond to relatively low frequencies.
  • a loud speaker comprising a relatively light and sti diaphragm, an external corrugated sound board of greater mass than the diaphragm and a flexible coupling between the two adapted to permit the cliaphragi'n to respond to relatively high f'requencies and adapted to transmit the relatively low frequencies to the sound board.
  • a loud speaker comprising a central relatively light and stifl1 diaphragm, an external resonator ot' corrugated board having greater mass than the diaphragm and a fieX ible coupling between the two adapted to permit the central diaphragm to respond to relatively high frequencies and adapted to transmit the relatively7 low frequencies to said resonator.
  • a loud speaker comprising a central, conical iliaphragm, an external resonator oi greater mass than said diaphragm and a flexible*coupling between the two adapted to permit die conical diaphragm to respond to relatively high frequencies and adapted to transmit the relatively low frequencies to said resonator.
  • a loud speaker comprising a central conical diai'ihragm. an external resonator of corrugated boa-rd and a connection between said diaphragm and said board adapted to permit the central diaphragm to respond to relativelyhigh frequencies and adapted to transmit the relativelyY low frequencies to said board.
  • Aloud speaker comprising a central conical diaphragm, a corrugated board providing an annular fiange or skirt extending radially beyond the conical diaphragm and a connection between the coni al diaphragm and the board adapted to permit the coni ⁇ al diaphjagm to respond to relatively high frequencies and adapted to transmit the relatively low frequencies to said board.
  • a loud speaker comprising a central conical diaphragm having an integral forwardly Haring brim portion and a corrugated board providing a fiange portion extending radially beyond the conical diaphragm, said forwardly flaring brim portion of the conical diaphragm being attached to said board.
  • a loud speaker comprising a conical diaphragm yrirovided with a peripheral corrugation forming a hinge portion and a corrugated board providing a flange or skirt portion extending radially beyond the conical diaphragm. said hinge portion being secured to said board.
  • a loud speaker comprising acorrugated board and a conical diaphragm fiexibly connected thereto so that a portion of said board extends radially beyond said conical diaphragm, the flexible connection between the conical diaphragm and the sound board being adapted to permit the conical diaphragm to respond to relatively high frequencies and being adapted to transmit the relatively low Jfrequencies to said board.
  • a loud speaker comprising a diaphragm and asound board of corrugated board connected thereto and adap-ted to be actuated thereby.
  • a loud speaker comprising a central conical diaphragm made of paper. an external corrugated board resonator, and a flexible connection between the two adapted to permit the conical diaphragm to respond to relatively high frequencies and adapted to transmit the relatively low frequencies to said board.
  • a loud speaker comprising a corrugated board resonator having a central opening, a conical diaphragm mounted in said opening. actuating means for said conical diaphragm and means f'or supporting said actuating means comprising a support attached tol said board and spanning the central opening thereof.
  • a loud speaker comprising an annular tiat corrugated board resonator having a circular central opening. a conical diaph agm having a circular periphery. said diaphragm being mounted in said opening ⁇ and a tlexiolc coupling between said diaphragm aim 1V board adapted to permit the diaphragm io respond to relatively high frequencies and adapted to transmit the relatively low ircqucncics to said resonator.
  • a loud speaker comprising an annular corrugated board resonator having a central opening. the edge portion of which is'pi ividcd with a tapering scat and a conical diaphragm mounted in .said opening. said diaphragm having a iorv-:ardly tlaring trusteH conical brim portion secured to said resonator on said tapering scat.
  • loud speaker comprising'a flat annular resonator made of cm'rugatcd board. said resonator having a central opening. the edge portion ot' which is provided with a tapering seat and a fibrous conical diaphragm mounted in said opening aml having an integral jforwardly projecting brim. a part of said brim being attached to the sound board at said tapering seat.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US159553A 1927-01-07 1927-01-07 Loud-speaker Expired - Lifetime US1763053A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US159553A US1763053A (en) 1927-01-07 1927-01-07 Loud-speaker
GB31/28A GB283210A (en) 1927-01-07 1928-01-02 Loud speaker
FR646683D FR646683A (fr) 1927-01-07 1928-01-03 Haut-parleur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US159553A US1763053A (en) 1927-01-07 1927-01-07 Loud-speaker

Publications (1)

Publication Number Publication Date
US1763053A true US1763053A (en) 1930-06-10

Family

ID=22573030

Family Applications (1)

Application Number Title Priority Date Filing Date
US159553A Expired - Lifetime US1763053A (en) 1927-01-07 1927-01-07 Loud-speaker

Country Status (3)

Country Link
US (1) US1763053A (fr)
FR (1) FR646683A (fr)
GB (1) GB283210A (fr)

Also Published As

Publication number Publication date
GB283210A (en) 1928-06-28
FR646683A (fr) 1928-11-14

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