US1609760A - Electrostatic telephonic instrument for transmitting or receiving purposes - Google Patents

Electrostatic telephonic instrument for transmitting or receiving purposes Download PDF

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Publication number
US1609760A
US1609760A US47662A US4766225A US1609760A US 1609760 A US1609760 A US 1609760A US 47662 A US47662 A US 47662A US 4766225 A US4766225 A US 4766225A US 1609760 A US1609760 A US 1609760A
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US
United States
Prior art keywords
diaphragm
holder
electrostatic
capacity body
rings
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Expired - Lifetime
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US47662A
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English (en)
Inventor
Massolle Joseph
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.)
Tri Ergon A G
Tri-Ergon A-G
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Tri Ergon A G
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Publication date
Application filed by Tri Ergon A G filed Critical Tri Ergon A G
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Publication of US1609760A publication Critical patent/US1609760A/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

  • This invention relates to improved electrostatic telephonie instruments for transmitting or receiving purposes and more particularly or preferably to a so-called loudspeaking receiver..
  • the reason of the superiority of the apparatusworking on the electrostatic principle resides in that heavy and strong iron diaphragmsneed notbeemployed therein and, as contrasted with magnetic loud-spcaking receivers, funnel-shaped amplifying lioins are not required in order to ensure a coupling with a quantity of air sufficient to realize a loud sound reproduction.
  • electrostatic loud-speaking receivers of ⁇ the ⁇ kind. as is well known in the art ⁇ allow of employing or applying larger surfaces so that such surfaces are sufficiently coupled with the air.
  • An object of this invention is to improve the electrostatic instruments for transmit- -ting or receiving purposes, particularly loudspcaking' receivers having tightly stretched diaphragms, as hitherto constructed, by stretching the latter into theirefficient position and holding the same in such position by means of the capacity body. or in other words,- by positively forcing the capacity body mounted on the diaphragm holder, towards the diaphragm and securing the body inthe holder with the diaphragm in v properly stretched position.
  • An electrostatic instrument constructed according to the present invention therefore, mainly comprises a rigid capacity body, a
  • the diaphragm preferably consists of an eX- tremely thin mica film with a metallic coat-,
  • the holder preferably con-- sists of two rings adapted to be firmly connected to cach other with the diaphragm interposed therebetween so as to be perfectly plane.
  • the two rings constituting the diaphragm holder are connected with each other by means .of screws or the like and they are shaped-in section-in a manner that., upon tightening the screws, the diaphragm periphcrally interposed between the two halves'.
  • Thethus obtained preliminary stretching of the diaphragm is efficiently completed preferably in the following way.
  • the rigid capacity body is provided With a contacting member or surface co-operating With-thefilm'or diaphragm and situated sufiiciently remote from or. above the active surface of the capacity body to cause the diaphragm, upon tightening the screws provided for connecting the capacity body to the holder to be displaced from its previous at condition or plane without changing or interfering with the requisite distance between the inner face of the diaphragm and the opposed face of the capacity body or with the parallelism of the active surfacey of the latter and the diaphragm.
  • Figure 1 being a View in axial. or central scction of the diaphragm holder with the diaphragm clamped, etween the two parts thereof in its preliminary'stretched posia similar sectional View of the capacity body; and Figure 3 showing the two components illustrated in Figures 1 and 2, duly assembled and with the diaphragm in fully tensioned condition.
  • the thin mica film 1 is providedon its outer face with an electrically conducting, preferably metallic coating 2 and the periphery of the diaphragm is clamped between the two rings 3' and. 4 which constitute the holder, these rings l being of like dimensions in diametrical respects.
  • the inner edge 5 of the'inner periphery of the ring3 is rounded, whilst the lnner edge of the outer periphery of the ring 3 is shaped to form an annular flange 11.
  • the two rings 3 and 4 are to be connected with each other, in superposed relation and with the peripheral portion of the diaphragm 1 therebetween, by means of screws 6.
  • the circularl or disk-shaped capacity body The circularl or disk-shaped capacity body.
  • the three portions constituting the capacity body are preferably made in one piece so as to be integral with each other.
  • the rim 8 comprises a main portion 9 which is of the same thickness, in axial regards, as the een tral portion ,19, and an Y'annular flange 10 projecting from the portion 9 outwards or in radial directions so that the' two parts 9 and 10 are perpendicular to each other.
  • Thel annular flange 10 is provided with a number of holes and insulating bushes 12 of non-conducting material are inserted into the holesY for the reception of screws 13.
  • the ring 4 of the diaphragm holder is provided with screw-threaded holes or openings 14 corresponding in number and location to of the capacity body, so that the latter can be firmly connected with the holder by means of the screws 13 passing through the bushes 12 and into the threaded holes 14 of the holder, as will be clearly understood on inspection ot' Figure 3.
  • the central portion 19 of the .capacity body is cup-shaped toaccommodate an annular disk 1? filling the cup to the level of the intermediate portion 7 of the body, and the bottom of the cup is enlarged to form a boss 20 with a central threaded bore for the reception of a short spindle or screw 18 the purpose ofrwhich will be explained further below.
  • l i y On the top of the described capacity body two flat'rings 15 and 16 made of ainon-conducting material such as pap'er or the like, are placed, the larger ring 15 being supported by the -portion 9 of the rim 8 and the narrower ring 16 being supported by the disk 17 which fits loosely in the cup or cavity of the central portion 19 of the capacity body.
  • the dimensions of the ring 4 of the holder and ot the portion 9 of the rim 8 of the capacity body are selected to render the distance a, Figure 1, between the lower or inner surface of the mica diaphragm andthe edge 14 ofthe ring 4 somewhat less than thc4 distance b, Figure 2, between the top of the bushes 12 and the plane of or coinciding with the upper faces of the paper or other insulating rings 15 and 16, so that upon assembling and connecting together the holder and the capacity body ⁇ by means of' .out of its position, shown inv Figure 1. into a parallel plane, as shown in Figure 3. In this way the requisite tension of the daphragm is brought about and the paper rings 15 and 16 act to prevent the properly stretched.
  • the disk 17 fitting loosely central portion 19 of the capacity body, and the spindle or screw 18, as hereinbefore described.
  • the disk 17 can be raised above the level or plane of the intermediate portion 7 of the v capacity body whereby the paper ring 16 kphragm is made or consists.
  • the intermediate'portion 7 of the capacity body ina be provided with perforations 21 pre erably arranged symmetrically all over the annular portion 7, for the purpose of reducing the damping in the between the diaphragm and the capacity body.
  • a second unit comprising a rigid condeiser exten ing late and seating means therefor said plate
  • a unit comprising a diaphragm and rigid ring secured to the edge thereof, a rigid condenserplate, seating means therefor rigidly connected thereto and extending radially outwards to the rear thereof, the-edge and center of and means for securing said seatsaid plate,
  • an electrostatic telephone thev combination of a holder, a diaphragm having its edge secured thereto, a rigid condenser plate, seating means therefor rigidlyv connected thereto and extending racially outwards to the rear thereof, spacing means extending through saidvplate and adapted to Abe positioned atan ad]usted distance beyond the faceof said plate, and means for securing said seating means against said said plate exerting pressure .gig .1,609,760

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US47662A 1925-07-09 1925-08-03 Electrostatic telephonic instrument for transmitting or receiving purposes Expired - Lifetime US1609760A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE248255X 1925-07-09

Publications (1)

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US1609760A true US1609760A (en) 1926-12-07

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US17256D Expired USRE17256E (en) 1925-07-09 Electrostatic telephxmca
US47662A Expired - Lifetime US1609760A (en) 1925-07-09 1925-08-03 Electrostatic telephonic instrument for transmitting or receiving purposes

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Application Number Title Priority Date Filing Date
US17256D Expired USRE17256E (en) 1925-07-09 Electrostatic telephxmca

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US (2) US1609760A (US06262066-20010717-C00424.png)
BE (1) BE331780A (US06262066-20010717-C00424.png)
FR (1) FR601399A (US06262066-20010717-C00424.png)
GB (1) GB248255A (US06262066-20010717-C00424.png)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6393129B1 (en) 1998-01-07 2002-05-21 American Technology Corporation Paper structures for speaker transducers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6393129B1 (en) 1998-01-07 2002-05-21 American Technology Corporation Paper structures for speaker transducers

Also Published As

Publication number Publication date
GB248255A (en) 1926-03-04
BE331780A (US06262066-20010717-C00424.png)
USRE17256E (en) 1929-04-02
FR601399A (fr) 1926-03-01

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