US1789554A - Electrostatic sound reproducer - Google Patents

Electrostatic sound reproducer Download PDF

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Publication number
US1789554A
US1789554A US291885A US29188528A US1789554A US 1789554 A US1789554 A US 1789554A US 291885 A US291885 A US 291885A US 29188528 A US29188528 A US 29188528A US 1789554 A US1789554 A US 1789554A
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US
United States
Prior art keywords
dielectric
plate
apertures
undulations
troughs
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
US291885A
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English (en)
Inventor
Kyle Colin
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.)
UNITED REPRODUCERS PATENTS COR
UNITED REPRODUCERS PATENTS Corp
Original Assignee
UNITED REPRODUCERS PATENTS COR
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 UNITED REPRODUCERS PATENTS COR filed Critical UNITED REPRODUCERS PATENTS COR
Priority to US291885A priority Critical patent/US1789554A/en
Priority to GB25728/28A priority patent/GB315294A/en
Priority to DEN29306D priority patent/DE528018C/de
Priority to FR660571D priority patent/FR660571A/fr
Application granted granted Critical
Publication of US1789554A publication Critical patent/US1789554A/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
    • H04R19/00—Electrostatic transducers

Definitions

  • the present invention relates to sound such as those used in radio reception, and has reference more particularly to the type known as electro-static'sound producers and reproducers.
  • a novel sound producer and reproducer of the electro-static type and having an. electrically conducting member, such as a metal plate having an undulated form or w1th apertures or holes distributed over the plate for location in the crests, slopes, and troughs of the undulations for release of compressions, and rarefactions of air at all points or loci thereof, and having a thin flexible dielectric associated therewith to flex toward the slopes and troughs of the undulations, the outer surface or that opposite from the surface adjacent the crests, hav-.
  • an electrically conducting member such as a metal plate having an undulated form or w1th apertures or holes distributed over the plate for location in the crests, slopes, and troughs of the undulations for release of compressions, and rarefactions of air at all points or loci thereof, and having a thin flexible dielectric associated therewith to flex toward the slopes and troughs of the undulations, the outer surface or that opposite from the surface adjacent the crest
  • the plate is preferably generally convex surface, and the dielectric is normally made to extend against the convex side of the plate and in contact therewith.
  • the dielectric may be of any suitable material, such as sheet rubber, rubberized fabric, piano cloth, such as rubberized silk, and other like and similar dielectric materials.
  • the reaction of these" stresses on the flexing parts of the dielectric appears to be greater against the dielectric parts that are less attracted by the electrostatic charge on the plate by reason of the greater distance between these parts of the dielectric and the corresponding parts of the slopes and troughs.
  • the invention comprehends, as an important feature thereof, the provision of means for releasing the compressions at substantialy all points or loci, the holes being in the crests, curved portions of the crests, in the S10 es, the
  • Fig. 1 is a perspective view with parts broken away of an electro-static sound producer constructed in accordance with the invention
  • Fig. 2 is a fragmentary sectional view through a part of the device
  • Fig. 3 is a fragmentary view in elevation of a part of the metal plate used in the device
  • Fig. 4 is a fragmentary sectional view through a plate having elongated apertures
  • Fig. 5 isa fragmentary view in elevation of the plate shown in Fig. 4.
  • the plate is also provided with a numberof apertures or holes 8, 9, 10, 11, and 12, such that the apertures 8 are located in the crest portions, while apertures 9 and 10 are in the slope portions of the undulations, and apertures 11 and 12 are in the trough portions, as clearly shown in Fig. 2 of the drawings.
  • the plate is of general convex form, and against the outer surface of the same is stretched a suitable thin flexible dielectric 13 with the dielectric normally in contact with the crest portions of the undulations and with the ends of the dielectric suitably secured to the side pieces 2 of the frame.
  • a flexible conducting coat of material such as gold-leaf, silver-leaf, aluminum-leaf or foil, or sprayed metal and other conducting substance, and other like and similar thin, flexible conducting material.
  • the plate 4 and the conductin surface 14 are, in practice, connected to t e opposite sides of the output circuit of an audio amplifying device or the like, whereby the charges in the plate 4 and foil 14 may vary in accordance with the audio variations in the electric circuit.
  • the dielectric and flex-. ible conductor is caused to move toward the plate with portions opposite the $10 s and troughs flexed, as shown in the dotted 'ne position thereof in Fig. 2.
  • the depth of the trough is preferably at least as great as and preferably greater than the greatest amplitude of movement of the lowest audible tone to be reproduced.
  • the flexing of the diaphragm is in the op osite directionor away from the surface 0 the plate, and rarefaction is released through the same apertures or openings, to allow'free movement of the dielectric and flexible coating thereon.
  • Figs. 4 and 5 is shown a plate similar to that shown in Figs. 2 and 3, with the exception that the apertures therein are elongated.
  • rtures 17 is located in the crests and extend 1nto the sloping parts thereof or in the slopes of the undulations.
  • Another set of apertures 18 is located in the slopes with portions extending toward the crest or into the curved portions thereof and into the curved portions of the troughs.
  • a third set of apertures 19 is located in the troughs with the ends extending into the slopes. The action of these apertures is similar to that described above in connection with the form of plates shown in Figs. 1, 2 and 3.
  • An electro-static sound reproducer comprising an electrically conducting member having a continuously undulating surface, said member having apertures in the slopes and troughs of the undulations, a flexible dielectric extending normall over the crests of the undulations, and a coating on the opposite surface of the dielectric.
  • An electro-static sound reproducer comprising an electrically conducting member having a continuously undulating surface, said member having apertures distributed over the member, a flexible dielectric extending normally over the crests of the undulathe opposite surface of the dielectric, said apertures being so located as to relieve pressure and rarefaction substantially normally to the flexed portions of the dielectric.
  • An electro-static sound reproducer comprising a frame having a convex side, a continuously undulated metal plate secured to said side and being generally 'convex, a flexible dielectric extending over the convex side of said plate and over the crests of the undulations thereof, said plate having apertures distributed over parts thereof, and a flexible exible conducting tions, and a flexible conducting coating on conducting coating on the outside surface of said dielectric.
  • An electro-static sound reproducer comprising a frame having a convex side, a continuously undulated metal plate secured to said side and being generally convex, the undulations of said plate being parallel to the axis of curvature of said late, a flexible dielectric extending over the convex side of said plate and over the crests of the undulations thereof, said plate having apertures distributed over parts thereof, and a flexible conducting coating on the outside surface of said dielectric.
  • An electro-static sound reproducer comprising an electrically conducting member rovided with a continuously undulated surace, said member having apertures distributed over the slopes and troughs of the undulationsthereof, a thin dielectric extending over the crests of the undulations, the portions of the dielectric o posite the slopes and troughs being adapts to flex toward said slo' es and troughs, said apertures being capa le of relieving compression and rarefaction of. air substantiall at a normal to the flexed parts of the die ectric, and a flexible conducting coat on the outer surface of the dielectric.
  • An electro-static sound reproducer comprising an electrically conducting member aving a continuously undulating surface, said member having apertures in the troughs of the undulations, a flexible dielectric extending normally over the crests of the undulations, and a flexible conducting coating on the opposite surface of the dielectric.

Landscapes

  • 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)
  • Diaphragms For Electromechanical Transducers (AREA)
US291885A 1928-07-11 1928-07-11 Electrostatic sound reproducer Expired - Lifetime US1789554A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US291885A US1789554A (en) 1928-07-11 1928-07-11 Electrostatic sound reproducer
GB25728/28A GB315294A (en) 1928-07-11 1928-09-07 Improvements in electro-static sound reproducers
DEN29306D DE528018C (de) 1928-07-11 1928-09-09 Elektrostatischer Tonerzeuger
FR660571D FR660571A (fr) 1928-07-11 1928-09-18 Appareil électrostatique producteur et reproducteur de sons

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US291885A US1789554A (en) 1928-07-11 1928-07-11 Electrostatic sound reproducer

Publications (1)

Publication Number Publication Date
US1789554A true US1789554A (en) 1931-01-20

Family

ID=23122277

Family Applications (1)

Application Number Title Priority Date Filing Date
US291885A Expired - Lifetime US1789554A (en) 1928-07-11 1928-07-11 Electrostatic sound reproducer

Country Status (4)

Country Link
US (1) US1789554A (de)
DE (1) DE528018C (de)
FR (1) FR660571A (de)
GB (1) GB315294A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863953A (en) * 1956-07-30 1958-12-09 Philco Corp Transducer
US2916562A (en) * 1956-10-18 1959-12-08 Pickering Associates Inc Directional electrostatic speaker assembly
US3058541A (en) * 1956-07-09 1962-10-16 Donald J Leslie Rotary electrostatic speaker

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973581C (de) * 1951-04-15 1960-04-07 Siemens Ag Kapazitiver elektroakustischer Wandler, vorzugsweise kapazitives Mikrofon

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3058541A (en) * 1956-07-09 1962-10-16 Donald J Leslie Rotary electrostatic speaker
US2863953A (en) * 1956-07-30 1958-12-09 Philco Corp Transducer
US2916562A (en) * 1956-10-18 1959-12-08 Pickering Associates Inc Directional electrostatic speaker assembly

Also Published As

Publication number Publication date
FR660571A (fr) 1929-07-12
DE528018C (de) 1931-06-24
GB315294A (en) 1929-11-07

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