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JPH01103400

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DESCRIPTION JPH01103400
[0001]
The present invention extends to a speaker diaphragm. (Prior art and its problems) It is
fundamentally required that a loudspeaker diaphragm faithfully convert an electrical signal to
sound. However, while making acoustical demands, economics are also required as well as shape,
volume and so on. To meet such requirements, the diaphragm of the elliptical speaker considered
to be realized with one speaker over the bass range to the treble range has a circular neck
portion, but the peripheral portion of the cone, that is, the loudspeaker having an elliptical planar
shape It is known that it is easy to exhibit a flat characteristic that is excellent in the ups and
downs in the high frequency range in terms of frequency characteristics. In particular, it is
pointed out that in the case of a speaker with a shallow cone, the tendency is strong (less
powerful than a circular speaker. Given that there is a problem with broadband music playback,
the use of elliptical speakers is desirable in terms of space for applications that focus on audio
transmission. In such a case, the same characteristics as a circular speaker are claimed. A
conventional elliptical speaker, in particular a diaphragm, will be described. 5 (a), (b) and (C)
show a plan view and a sectional view of a conventional speaker diaphragm. FIG. 5 (b) is a crosssectional view of the major axis, and FIG. 5 (C) is a cross-sectional view of the minor axis. In the
figure, 1 is a cone obtained by molding mainly vegetable fiber, 2 is an edge fixedly supported on
a speaker frame (not shown), 3 is a bobbin for winding a voice coil (not shown) is there. As
shown in the figure, an elliptical speaker diaphragm is an angle formed between the central axis
of the cone 1 and the cross section of the cone 1, that is, a half apex angle is ?1 in the major
axis cross section and ?2 in the minor axis cross section, ?1> ?2. Relationship. Further, along
the entire circumference of the cone 1, it has a cone shape in which the half apex angle gradually
changes from ? 1 to ? 2. The characteristics in the high range of the moving plate are
influenced by the stiffness of the neck portion of the cone 1. By the way, the cone concentrated
stiffness SMN is S MW = ?f: h (cos' ?, z sin ?). E: Young's modulus of material h: thickness of
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material ?: half apex angle Therefore, the half apex angle of the above-mentioned elliptical
speaker diaphragm changes from ?-?1 to ?2 and is not uniform, cone In the vicinity of the
major axis and the minor axis of (1), the concentrated stiffness changes, and there is a drawback
that the same sound quality as that of the circular speaker diaphragm can not be obtained.
(Means for Solving the Problems) The present invention has been proposed to solve the abovementioned deficiency, and in the speaker diaphragm having a planar shape other than a circle
with respect to the central axis, along the periphery of the neck A summary of the speaker
diaphragm is characterized in that a half negative angle is substantially constant.
Hereinafter, examples of the present invention will be described. The embodiment is merely an
example, and it goes without saying that various changes or improvements may be made without
departing from the spirit of the present invention. 1 (a), (b) and (C) are views showing an
embodiment of the present invention, and FIG. 1 (a) is a plan view of an imaging plate, FIGS. 1 (b)
and (c). ) Are a major axis sectional view and a minor axis sectional view of a cone. In the figure,
4 is a cone obtained by mainly molding and shaping plant fibers (however, the cone of the
present invention is not limited to paper (the material of corn can be freely selected) and 5 is
illustrated. An edge for fixing and supporting the cone 4 to the frame of the speaker not shown, 6
is a bobbin for winding a coil not shown. In the diaphragm of the present invention, the cone 4
near the minor axis is curved outward, and the half apex angle ?3 near the major axis and the
half apex angle ?4 near the minor axis are substantially the same. And gradually change the
curve straight along the short diameter axis and to form a substantially constant half apex angle
over the entire circumference. Thus, it is an oval cone, and by making the half apex angle
constant over the entire circumference, the stiffness shown in the above equation is made
uniform to improve the tone quality in the high tone range. Also, in the case of a moving plate
other than a circular plate, considering the junction between the cone and the edge, the cone 4
and the edge 5 can cross at a deep angle ?1 as shown in FIG. 2 (a) near the minor axis. In the
vicinity of the axis, since it intersects at a shallow angle ?2 as shown in FIG. 2B, the strength
may be insufficient and unnecessary bending vibration may occur. In this case, as shown in FIG.
3, it is desirable to provide ribs 8 on the cone 7 to increase the strength. It is to be noted that the
present invention is effective when applied to a non-circular diaphragm such as the track-type
speaker diaphragm 9 or the long elliptical speaker diaphragm 10 shown in FIGS. 4 (a) and 4 (b).
(Effects of the Invention) As described above, according to the present invention, in the speaker
diaphragm having a planar shape other than a circle with respect to the central axis, the half
apex angle is made substantially constant along the periphery of the neck. It is possible to
provide a speaker diaphragm having a sound quality similar to that of a circular speaker, with a
constant half apex angle of the neck portion, uniform stiffness throughout the room, and the like.
4 and 1IJ 11 in the drawings FIGS. 1 (+1), (b) and (C) show an embodiment of the present
invention, wherein (a) is a plan view and (b) is a major axis Cross-sectional view, Fig. 2 (C) is a
cross-sectional view of the minor axis, Fig. 2 (a) and (fist) an explanatory view of the junction of
the cone and the edge, and Fig. 3 a description of the cone provided with a rib Figs. 4 (a) and 4
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(b) are explanatory views of speaker diaphragms having other shapes, and Figs. 5 (a), 5 (b) and 5
(c) are diagrams for explaining conventional elliptical diaphragms. The same figure (a) is a plan
view, the same figure (b) is a major axis sectional view, and the same figure (C) is a minor axis
sectional view.
4 иии cone, 5 иии edge, 6 иии bobbin, ?3. ?4
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2 Fig. 2 Fig. 3 Figure (a) (c)
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