USRE17257E - Joseph massolle - Google Patents

Joseph massolle Download PDF

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Publication number
USRE17257E
USRE17257E US17257DE USRE17257E US RE17257 E USRE17257 E US RE17257E US 17257D E US17257D E US 17257DE US RE17257 E USRE17257 E US RE17257E
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United States
Prior art keywords
diaphragm
electrostatic
capacity
rigid
plate
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Expired
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English (en)
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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
    • H04R19/00—Electrostatic transducers

Definitions

  • JOSEPH MASSOLLE F BERLIN-WILMERSDORF, GERMANY, ASSIGNOR TO TRI-ERGON A. G., OF ZURICH, SWITZERLAND, A CORPORATION OF SWITZERLAND.
  • the electrostatic telephones for transforming alternating electric currents with sound tlltlIiltl'OI'lFtlCzi lnl'O sound waves comprise a rigid capacity body and an elastic or resilient diaphragm located in close proximity to the former and consisting of a mica him or the like with a metallic coating thereon. If electric potentials are applied intermediate between the rigid capacity body and the metallic coating, the distance between the diaphragm and the capacity surface of the rigid body will vary according" to the degree of applied potential, due to electrostatic attraction and the movements of the. diaphragm will pro- -duce sound or acoustic vibrations in the surrounding air coupled therewith.
  • any ⁇ "lbrating diaphragm has a series of pronounced .resonance notes or tonality and the frequencies corresponding to such resonance notes involve or produce disproportionately wide amplitudes of the diaphragm and overrun considerably all of the other frequencies.
  • the object of this invention is to have the form of the curve correspond perfectly to the variations of the fluctuations of applied potential and with this object in view the distance between the capacity surface and the diaphragm is made essentially less near the periphery than at the centre so that the t llttlzllltlg'll'l will be influenced by the electrostatic forces with a power gradually increasing in the direction from the centre towards the periphery. 'In this way the diaphragm will be efliciently prevented 40 from swinging in pronounced resonance notes.
  • Figure 1 is a sec- 1929. Serial No. 341,548.
  • the diaphragm 1 is peripherally attached to and enclosed in a frame 2.
  • a rigid capacity body 3 of slightly concave, preferably conical, shape is provided and firmly connected with theframe 2 by means of screws or the like, as clearly shown.
  • thin sheetof insulating material such as nnca, having a conducting 'metallic coating; thereon.
  • the capacity body 3 If a constant electrical potential difference is provided intermediate between the capacity surface of the body 3 and the metallic coating of the diaphragm, the latter will be bent inwards, upon talking, from the position of rest, shown in dotted lines at 4, into the position 1 shown in full line.
  • the shape of the capacity body or of the active surface thereof involves that the distance between the capacity surface andthc diaphragm is substantially less near the periphery as at 5, than at a central point thereof, as at 6. Consequently the electrostatic forces are substantially more powerful near the periphery than near the centre of the diaphragm and the capacity surface, so that the diaphragm will be controlled or influenced with increasing intensity from the centre towards the periphery thereof.
  • the seat formed by the head 7 of a screw provided at the centre of .the body 3, serves the purpose of supporting the diaphragm centrally, in order to produce smaller distances between the diaphragm and the body 3 which are equivalent to or bring about an intensification of sound.
  • the capacity body 3 is provided with perforations 8 for the purpose of reducing the damping in the narrow space between the diaphragm and the body 3.
  • the damping is chiefly produced by or dependent upon the friction of the air fluctuating on and between the diaphragm 1 and the capacity surface, so that it will be possible to control the aerial friction and reduce the same to any desired degree by adequately dimensioning the perforations 8 or selecting the number and position thereof.
  • the diaphragm may consist of a ill
  • 9 designates the diaphragm having a metallic coating
  • 10 is the frame in which the diaphragm is peripherally enclosed
  • 11 is the capacity body.
  • the latter is a flat'or plane body and not of conical shape as in Figure Itgoes withoutsaying, that thediaphragm may be divided into a plurality of portions or sections or may be'composed got several sections adapted to be influenced in the manner hereinbefore explained .andspecifically described with reference to Figures 1 and 2.
  • a diaphragm divided .into or, composed of several sections eachpoint or place where the same are clamped in or otherwise Q
  • An electrostatic ;telephoi1e comprising afrigidicapacity body and-a diaphragm cons meted-therewith constitutinga movable condenser plate, the construction and. .arrange- ,ment of the parts being such thatthe distance between, the said body; and. the said, diaphragm isless at theperiphery than at the 2.
  • An electrostatic Itelephone comprising a rigid-capacity body, a resilient diaphragm constituting a movable condenser plate, and
  • An electrostatic telephone comprising a rlgid plate constituting a capacity body and a resilient diaphragm constituting a movable condenser plate held in ,face to face relation with said rigid plate-at distances between the same. which vary, the variation in said distances being adaptetlzto overcome pronounced resonance of said, diaphragm when acoustically modulated electrical potentials are, applied'between said rigid and movable plates.
  • An electrostatic telephone comprising a, rigid flat capacity body, a diaphragm connected therewith constituting a movable condenser plate, and a means for adjustably holding the diaphragm a certain distance apart'i'romfthesaid body, the saiddistance gradually increasing from the periphery towards the .centreof the two parts.
  • Ali-electrostatic telephone comprising a rigichplane capacity body, a diaphragm connected'therewith, and a screw in the centre otdhe said body for adjust-ably holding the.
  • d aphragm a certain distance apart from thesaid body, the said distance gradually increasing fromv the periphery of the said diaphragm towards the said screw, substantially as and for the purpose set forth.
  • electrostatic telephone comprising a rigid capacity body, a diaphragm C011. nected therewith, constituting a movable condense-r plate, and means forliolding the latter firmly connected with the said body ata arying distanceapart from thesame, .said rigid body having perforations therethrough.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
US17257D 1925-04-07 Joseph massolle Expired USRE17257E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE246728X 1925-04-07

Publications (1)

Publication Number Publication Date
USRE17257E true USRE17257E (en) 1929-04-02

Family

ID=5935188

Family Applications (1)

Application Number Title Priority Date Filing Date
US17257D Expired USRE17257E (en) 1925-04-07 Joseph massolle

Country Status (4)

Country Link
US (1) USRE17257E (xx)
FR (1) FR601369A (xx)
GB (1) GB246728A (xx)
NL (1) NL17774C (xx)

Also Published As

Publication number Publication date
FR601369A (fr) 1926-03-01
GB246728A (en) 1926-02-04
NL17774C (xx)

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