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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention,
FIG. 1 is a cross-sectional view of a speaker, and FIG. 2 is a plan view of a voice coil. 1 ······ Voice
coil, 9 ······· Conductive foil. / +-1 l 2-73-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a voice coil of an
acoustic device such as a speaker, a microphone and the like, and relates to a voice coil wound by
a conductive foil band. Conventionally, a voice coil in an acoustic device such as a speaker or a
microphone is formed by winding a thin wire, so there is no problem with a low frequency signal
current, but when a high frequency signal current flows, the skin effect produces high
impedance. (11 高 域 high band had the disadvantage of attenuating. The present invention has
been made in view of such a point, and the conductive foil band is wound in layers to form a
voice coil, so that the shadowing effect due to the barley skin effect is prevented and the signal
current in the high frequency range is also obtained. It is an object of the present invention to
provide an acoustic device that can operate well without loss. One embodiment of the present
invention will be described with reference to the drawings. In FIG. 1, (1) is a speaker yoke, and a
center pole (2) is fixed to a central portion of the yoke (1) and a cylindrical magnet (3) is fixed to
the yoke (1). A plate (4) is fixed to the upper surface of the plate. A frame 15+ is fixed to the
upper surface of the plate (4), an edge of the cone paper (6) is fixed to the open end of the frame
(5), and a throat of the cone paper (6) (2) A bobbin (8) wound with a voice coil (7) is provided,
and the center pole (2) is inserted through the voice coil (7) K. そして(8a)はキップ、
(7a)はダンパである。 In the voice coil (7), a conductive foil band (9) such as copper foil or
aluminum foil is interposed between an insulator 00 such as paper on a bobbin (8) formed of
paper etc. shown in FIG. It is formed by winding in layers in the diameter direction. And (9) a
voice coil (in which a lead portion αυcI is formed at an inner portion and an outer end portion
of the conductive foil strip). In the voice coil (7) thus formed, the increase in surface area of the
conductive foil band (9) prevents the increase in impedance based on the skin effect, and the
acoustic conversion from low to high to flat is achieved. Is done. (3) For example, considering a
voice coil wound 50 times with two layers of enameled wire of 0.2 u in diameter, it can be wound
50 times with a copper foil of thickness 8P. Although the voice coil is wound on the bobbin for
the unimplemented case U..., The voice coil may be formed only by the conductive R1 band
without using the hobin. According to the present invention, since the conductive foil band is
wound in layers to form the whiss coil, it is possible to prevent the occurrence of high irradiance
with respect to the high frequency region due to the six-skin effect, and the acoustics have
extremely flat characteristics from low frequency region to high frequency region. It can be