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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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Assuming that the side of the first page and the voice coil 31 side of the electret 22 attached to
the center pole 21 have the same charge, electrostatic repulsion acts and the voice coil 31 is held
at the center of the air gap. Further, when the voice coil 31 is slightly deviated, a repulsive force
that is in inverse proportion to the square of the distance appears, and the voice coil 31 is
restored to its original position. As described above, the conventional damper unit 1 which is
centered around the voice coil 31 using the electrostatic force of the electret is unnecessary. As
described above, in the loudspeaker of this embodiment, since the damper which has
conventionally become the cause of the non-linear distortion is unnecessary, the non-linearity
and the reduction of the linear distortion can be rho; and the high compliance speaker can be
manufactured. . . It is obvious from the above example 2! According to the present invention, the
voice coil bobbin is formed by the electret, and the electret is wound around the side wall of the
center pole, and the electrostatic repulsion force acting between the electret and the voice coil
bobbin causes the voice coil bobbin to The following effects can be obtained. (1) Distortion is
reduced because the damper that causes nonlinear distortion is eliminated. (2) A high-compliance
speaker can be manufactured because the center can be held without a damper and the support
of the vibration system is only an edge. (3) By using an inorganic electret having high
permeability, it is possible to reduce the air gap as compared with the one using plastic and
Tsukue electret, and to improve the efficiency of the speaker.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electrodynamic speaker, and FIG. 2 is a diagram of the electrodynamic speaker according to an
embodiment of the present invention. 7?-22, 2 pairs, 26 ииииии Voice, coil bobbin, 27 иии 1 иии
Vibration plate. ?????????????????????? ?
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