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The present invention relates to an electrostatic sound transducer in which a perforated flat
electrode, an electrically conductive plastic film and a second electrode are arranged one behind
the other. Electrostatic loudspeakers are known which include perforated copper-coated hard
paper electrodes, or wire electrodes wound on coils or metallized plastic films. The disadvantages
of these elements are the high cost of producing the electrode, the difficult insulation, the
resistance of the metal layer to alternating stresses, and the charge of the film material. The
metal layer peels off during a period of time that is the result of alternating bending and destroys
the conductivity of the film. The invention is based on the object of finding an electrostatic sound
transducer which is manufactured in a simple manner, gives good results and is resistant and
inexpensive to structural elements. The object of the present invention is to provide an
electrically conductive elongated electrode having a layer of sintered plastic on the outer surface
of which a flat electrode is designed to have a disruptive strength of at least 6 kV. A plastic film
consisting of a perforated sheet and at a distance above this layer, which is itself electrically
conductive and can be stretched using a stretching element, is arranged and at a distance This is
achieved by being covered with a coated electrically conductive elongated perforated sheet
which makes up the second electrode. Loudspeakers of this type of construction are suitable for
accurately emitting frequencies of L 50 11 z to 20 kHz and higher. Because of their excellent
impulse response, they are particularly suitable for digital compact disc playback. The coating of
the electrode provides reliable retention against spark discharge and in the case of mechanical
stress. Electrically conductive particles, in particular plastic films in which carden black has been
introduced directly into the plastic, retain their properties even in the peripheral area subjected
to one special stress after a change in many vibrations. This means that no replacement is
necessary as in the case of the previously known vapor-deposited films. The structure is easy to
assemble. The structural elements can be easily made from commercial products. For use as an
electrode, any of electrically conductive solid materials having conductivity higher than 8 m / Q,
Dragon 2 and particularly metals such as aluminum, steel and the like are suitable. For reasons of
stability, it should be from 0,8 to 3, in particular 1.2 to 2.0 m thick. The materials described
should have a breaking strength to the IAcAc type which is higher by 3 to 7 and in particular
higher than 6 kV for reasons of operating reliability.
Saponified ethylene / vinyl acetate copolymers can be used as sintered (5 interttd) plastics. Also
suitable are polyamides, polyvinyl chloride, polyolefins, polyesters, fluoropolymers and other
plastics. Plastics, for example polycarbonates, in which electrically conductive particles have been
introduced are suitable for use as the electrically conductive film; the specific electrical resistance
according to DIN 53596 should be lo-1 to 103 Ωα, in particular 0.5 to 5 Ωm. is there. The film
thickness Fi is 3 to 30 [mu] m1, particularly 8 to 15 [mu] m. The plastic film can be pre-stretched
in two directions prior to placement. In FIG. 1, it consists of two elongated perforated steel sheets
2 with an outer layer of saponified ethylene / vinyl acetate copolymer 3, with the aid of a screw
entering between the elongated holes 6 serving as the stretching element 8 between them. The
cross section of the sound transducer 1 is shown in which the conductive film 4 sandwiched
between the two strips 5 is arranged. FIG. 2 shows an audio transducer 1 consisting of an
elongated perforated steel sheet with a long hole 6 with a screw 7 which can be loosened with
respect to a strip 5 (not shown) in the peripheral area Show. Example: A sandblasted elongated
steel sheet with dimensions 1000 x 200 x 1.5 tram with ethylene / vinyl acetate copolymer
saponified in a fluid bed for use with the electrodes. It was coated and then tested to see if it had
a breaking strength of 6 kV. Longitudinal elongated holes are screwed into the longitudinal holes
of the narrow side r of this perforated steel sheet (1 running in parallel, a strip of insulating
material in the order of width and thickness 1.5) It was fixed to an elongated perforated steel
sheet along the peripheral area by using A plastic film of polycarbonate was glued onto these
strips and then the strip held by the screw in the elongated hole was moved along the length of
the hole to stretch it (-). After overlapping the other strips as spacers, in the final audio
transducer the plastic film is sealed at both ends by electrodes which are each separated by a
distance of 1.5 mm. A fixed steel sheet was fixed.
Brief description of the drawings
1 and 2 are a cross-sectional view and a top view, respectively, of an electrostatic sound
transducer according to the present invention.
1: voice converter, 2 new steel sheet, 3: outer layer, 4: conductive film patent applicant Bayer
Akchenke 9 gel shaft
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