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DESCRIPTION JPS54147027

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DESCRIPTION JPS54147027
Description of Invention
Thin speaker
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thin speaker and
aims to reduce the depth dimension. In the past, the thinning of the speaker has been gradually
improved in order to thin the portable small radio. However, since the basic structure is a
conventional one, the reduction design in the thickness direction is at its limit 1 The crosssectional view of FIG. 1 explains the problems attributed to the conventional basic structure,
There are a voice coil 1 wound in a cylindrical shape, a center ball 2 provided in the hollow
thereof, and an outer peripheral ball 3 in contact with the outer periphery thereof. A permanent
magnet 4 and a yoke 5 are provided to generate a magnetic flux between these two balls. .
Because of this structure, two balls with one voice coil must be polarized to one of S or N poles
(direction of the magnetic flux in the illustration X), and the characteristics of the permanent
magnet are illustrated in the illustration N Magnetic flux is generated only in the -8 direction
(direction Y in the figure), so a yoke and a center ball are required to form a compromise
between the two, so the permanent magnet and voice coil can not be placed on the same plane
and are permanent. The magnet must be placed at a position retracted from the voice coil, and
there is a limit to the reduction in thickness direction, so a thin speaker by compression design in
the thickness direction of each member is now put to practical use EndPage: 1 However there
was dissatisfaction that the unreasonableness of each part appeared in sound efficiency and
sound quality deterioration as a result. The present invention achieves thinning of a speaker by
applying a basic structure different from the above-described conventional structure. The
structure of the thin speaker according to the present invention will be described with reference
to FIGS. 2, 3 and 4. 2 shows a cross section of the central portion of the entire speaker as in FIG.
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1, and FIG. 2 shows a plan view from the back direction of the speaker with a part cut away. As
shown in FIG. 4, a rectangular coil having a hollow inside and having a connector 12 fixed at the
center of one outer end long surface 11? of the outer peripheral portion and connected with a
cone 13 and a damper 14 2 is fixed to the outer frame frame 15, so that the voice coil is in close
contact with four long planes 11AK on one voice coil pivotally supported in the direction of
arrow A in FIG. There is a magnet 16, and the direction of magnetization is perpendicular to the
long plane of the voice coil. The four magnets form a series magnetic circuit in which two yokes
17 surround the long side of the voice coil. , These permanent magnets and yokes 3 and 4, which
are fixed to the central back surface portion 15a of the rubber and protected by a cap 18 or the
like made of a nonmagnetic material in order to prevent the intrusion of dust, magnetic powder
or the like into these magnetic elements. FIG. 4 explains the operation of the loudspeaker
according to the invention.
The electrical signal supplied to the voice coil is connected to a coil wire joined to cone paper
from a terminal attached to a frame as in the conventional speaker from a terminal attached to a
frame, though detailed in the figure. The coil wire is obtained by attaching the wire at the inner
end and the outer end of the voice coil to a connector. Here, when the electric signal tp'ic current
flows in the voice coil, the voice coil and the movable member connected thereto swing in the
direction of arrow A according to the direction of the current. The factor determined by the width
MY of the permanent magnet shown and the winding thickness OtO ratio of voice royl is large.
The coil winding thickness is smaller than the width of the permanent magnet in the speaker, and
it is difficult to express in the figure but the coil width Ow The gap G is more efficient in the
condition not contacting the coil, and the efficiency is better and the gap MG common to the gap
is common to this gap. The distance MG of the two permanent magnets is sufficiently wide. Since
the winding in the longitudinal direction of the voice coil contributes to the motion, the
longitudinal direction at is given sufficiently large in the transverse direction Os as the planar
shape of the coil. As described above, the speaker according to the present invention is
characterized by the voice coil and the magnetic circuit of the permanent magnet related to it,
and these are disposed on the same plane of the frame back and have a thin structure but do not
lose sound quality. It is what you get.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 2 is a cross-sectional view of the central portion
showing the basic structure of a conventional speaker FIG. 2 is a cross-sectional view of the
central portion showing the basic structure of the speaker of the present invention, FIG. It is
partially cut away in the top view from the direction. FIG. 3 is a cross-sectional view of the main
part of the speaker according to the present invention, and FIG. 3 b is a side view of FIG. FIG. 4 is
a perspective view of the voice coil of the present invention. 11 ...... voice coil 11a ... outer end
longitudinal faces 11 & ... Length plane 12 ...... consolidated 13 ... ... cone 14 ... ... damper 15 ----- и
Frame 16 ииииииииииииииииииииииииииииииииииии ?
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