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JPS5063442

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DESCRIPTION JPS5063442
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the structure of
a conventional dome-shaped diaphragm, FIG. 2 is a diagram schematically showing the front
dome portion, and FIG. 3 is a dome-shaped diaphragm of the present invention FIGS. 4 and 5K
show an embodiment of the present invention. It is a h-me part. -97- Japanese Utility Model
Application Publication No. 50-63442 (.2) Fang 3 FIG.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of a
dome-shaped diaphragm, which relieves excessive strength (stiffness) of the outer peripheral
portion of the dome portion, and increases the radiation area of sound and makes the molding
extremely easy. According to the diaphragm. A conventional dome-shaped diaphragm generally
forms a light metal such as duralumin, as shown in FIG. 1, to form an outer edge sticking portion
2 as a dome (spherical shell) portion 1, and this edge sticking The voice coil bobbin 4 is fixed to
the outer peripheral portion of the dome portion 1 and is roughened into a magnetic circuit (not
shown). The dome portion 1 of this conventional dome-shaped diaphragm has different strengths
(stiffness) in the vibration axis direction due to its two shapes, and the angle between the dome
portion 1 and the vibration axis direction of the tangent plane in each portion is smaller strong.
That is, in FIG. 2 schematically showing the conventional dome portion 1, the tangent plane at
the top of the dome portion 1 is, for example, a.phi., Since the tangent to the driving force (arrow)
force direction, that is, the vibration axis direction is approximately perpendicular. Strong or
weak, the curved surface from the top to the outer periphery is curved with the same radius of
curvature, and the angle between the tangent and Iil '[[i's vibration axis direction in each part of
the spherical element gradually decreases (b white, 10 points ), The strength gradually increases
and becomes maximum at the outer periphery of the dome portion 1. In other words, the
strength in the vibration axis direction of the outer peripheral portion was still in a state of
excessive strength as compared with the vicinity of the middle from the outer periphery to the
top of the dome portion 1 and there was no real benefit. Also, generally, the outer diameter of the
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dome portion 1 and the voice coil diameter are almost equal, and the acoustic radiation area is
not sufficient. In the prior art, the radius of curvature of the dome portion 1 has been increased
to increase the radiation area, or the dome portion 1 in particular has a drawback of being
weakened at the top. The present invention, as well as eliminating these conventional drawbacks,
is very easy to form the diaphragm and will be described in the following with reference to the
drawings. FIG. 3 solid line fa) schematically shows the dome-shaped diaphragm of the present
invention, and dotted line (b) schematically shows the conventional dome-shaped diaphragm. In
the solid line (a), the radius of curvature R1 of the top portion 5a of the dome portion 5 is the
same as that of the conventional one, and the top portion 5a maintains the same strength as the
conventional dome-shaped diaphragm and forms a spherical surface (spherical shell) Do. The
curved surface extending to the outer peripheral edge of the dome portion 5 continuously with
the top portion 5a gradually increases the radius of curvature from about the middle to the outer
side (only the outer peripheral portion 5b) (R, <R, <R3) It becomes the largest at the outer edge.
Accordingly, the angle between the tangential plane at each portion of the outer peripheral
portion 5b of the dome portion 5 and the vibration axis direction is larger than that of the
conventional one, and the strength of the outer peripheral portion 5b in the vibration axial
direction is reduced to be excessive or relaxed. The strength in the direction (horizontal direction)
perpendicular to the axis is increased, and the deformation of the dome portion 5 in that
direction is suppressed.
That is, according to this invention, only the strength in the vibration axis direction of the four
outer peripheral portions 5b is reduced without reducing the strength of the weak top portion 5a
compared to the outer peripheral portion 5b, and the excessive strength is alleviated. At the same
time, the outer diameter of the dome portion 5 increases and the acoustic radiation area also
increases. Further, since the height of the dome portion 5 is increased without becoming the
outer diameter of the dome portion 5, the easiness of molding which is determined by the ratio
of the outer diameter and the height of the dome portion 5 is dramatically increased. Therefore,
it is possible to obtain a dome diaphragm having a dome portion 5 with excellent vibration
characteristics, which can suppress the formation strain of the top portion 5a and the
concentration of internal stress, etc., which are required to have a large size and a large amount
of deformation. FIG. 4 shows the embodiment of the present invention described above, and FIG.
5 shows another embodiment in which the outer peripheral portion 5b is a conical surface
continuous with the spherical surface of the top portion 5a. Thus, the dome-shaped diaphragm of
this invention is formed of the dome portion 5 by the top portion 5a of the spherical surface
(spherical shell) and the outer peripheral portion 5b of the curved surface which is continuous
with the top portion 5a and the radius of curvature gradually increases outward. Therefore, the
strength in the horizontal direction of the outer peripheral portion 5b is increased without
decreasing the strength of the top portion 5a, the intensity return or relaxation of the outer
peripheral portion 5b, and the acoustic radiation area is increased. Also, this makes it very easy
to form a vibration plate, and has the advantage of being able to obtain a dome diaphragm with
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excellent vibration characteristics as well as cost reduction.
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