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JPS63155900

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DESCRIPTION JPS63155900
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker, and more particularly to a cone loudspeaker using a diaphragm having excellent
rigidity. [Prior Art] Conventionally, as described in JP-A-61-19160, a diaphragm having high
rigidity is obtained by selecting the material of the diaphragm. Also, many examples have been
proposed in which a diaphragm with high rigidity is obtained by devising the shape of the
diaphragm, the manufacturing method, and the like. FIG. 2 is a half sectional view showing an
example of a conventional cone speaker. As is clear from FIG. 2, although the conventional cone
speaker has various devices for increasing the rigidity as described above, it has been usually
constituted of a single diaphragm 6. [Problems to be Solved by the Invention] However, in the
configuration in which only one diaphragm of the speaker is used, its rigidity is high (there is a
limit even if various attempts are made to obtain sufficient rigidity. There was a problem of that.
An object of the present invention is to provide a speaker using a diaphragm which has the
above-described conventional problems (and has a sufficiently high rigidity). [Means for Solving
the Problems] The above object can be achieved by forming a diaphragm of a cone speaker by
combining two or more diaphragms (corns) having different half apex angles or curvatures.
[Operation] If a combination of two or more cones having different half apex angles or curvatures
is used as a diaphragm, the resonance frequency of each cone is different, so that high rigidity
can be obtained as a whole of the diaphragm. become. An embodiment of the present invention
will be described below with reference to FIG. In FIG. 1, a magnetic circuit 1 is constituted by a
plate 2 provided with a center ball 2α, a ring-shaped magnet 3 and a ring-shaped top plate 4 as
well. A frame 5 is coupled to the magnetic circuit 1, and a diaphragm 6 and a diaphragm 7 are
coupled to the frame 5 via an edge 8. The voice coil 9 is coupled to the central portion of the
diaphragm 6 and the diaphragm 7, and the intermediate portion of the voice coil 9 is held by the
damper 10 and fitted into the magnetic gap 11 of the magnetic circuit 1 without eccentricity.
11-05-2019
1
Further, a dust cap 12 is attached to the central upper surface of the diaphragm 6 so as to
prevent dust and the like in the air from entering the magnetic gap IIK. In the loudspeaker
according to the present embodiment having the above-described configuration, the half apex
angles of the diaphragm 6 and the diaphragm 7 are different, so that they have different
resonance frequencies. Therefore, if the diaphragm 6 and the diaphragm 7 are firmly connected
as a so-called three-dimensional structure via the voice coil 9 as in this embodiment, a very high
rigidity can be obtained as the whole diaphragm. 5 get busy.
In the above description, two diaphragms (corns) are used, but it is a matter of course that the
rigidity of the diaphragm as a whole can be increased by using three or more cones. In the above,
two or more cones having different half apex angles are used, but it will be apparent that the
same effect can be obtained by using two or more cones having different curvatures. In the
practice of the present invention, a speaker with high rigidity can be manufactured without
particularly requiring new production equipment and jigs. As apparent from the above
description, according to the present invention, a diaphragm with high rigidity can be obtained
by using two or more cones having different half apex angles or curvatures. In addition, the
speaker of the present invention using the above-described diaphragm with high rigidity can be
manufactured without using new production equipment and jigs, so that it can be manufactured
at low cost.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a half sectional view of an embodiment of the present invention, and FIG. 2 is a half
sectional view showing an example of a conventional cone speaker.
Reference Signs List 1 magnetic circuit 2 plate 3 magnet 4 top plate 5 frame 5 diaphragm 7
diaphragm 7 8 Edge, 9 ... voice coil, 10 ... damper, 11 ... magnetic gap, 12 ... dust cap.
11-05-2019
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