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JPS56145192

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DESCRIPTION JPS56145192
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing the main
part of a conventional dome-shaped speaker, and FIG. 2 is a diagram showing a vibration mode
near the high frequency reproduction limit frequency by the finite element method of the domeshaped speaker. FIG. 3 is a longitudinal sectional view showing an essential part of a domeshaped speaker provided with a diaphragm according to an embodiment of the present invention.
1 ииииии Diaphragm, 5 иииииииииииииииииии The same parts in the drawings indicate the same or corresponding
parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
diaphragm in which a dome-shaped loudspeaker diaphragm is engaged, in particular, the
peripheral edge portion is reinforced to realize a broadband speaker. An example of a
conventional dome-shaped speaker is shown in FIG. In FIG. 1, 1 is a dome-shaped diaphragm, 2 is
an edge, 3 is a bobbin, and 4 is a voice coil. Then, the dome-shaped diaphragm 1 is formed by
pressing a material made of a thin plate of a material that can be easily press-formed, such as
aluminum or titanium rolled to a uniform thickness, L7. r; / '-'-. Therefore, the diaphragm 1 ░
has the same thickness in any part. The output sound pressure frequency characteristic of the
dome-shaped speaker shown in FIG. 1 generally shows a characteristic having a large peak in the
high region, and a frequency at which the frequency band which can actually be used as a
speaker has a large peak. It becomes below the limit frequency. The transducer element in the
vicinity of the high frequency reproduction limit frequency is determined by a finite element as
shown in FIG. 2. From FIG. 2, it is apparent from FIG. 2 that the peripheral portion of the dome
shaped diaphragm is near the high frequency reproduction limit frequency. Vibration in the
opposite phase to the central part of the diaphragm, the position of the nodal circle at this time
occurs near the peripheral edge of the diaphragm, and movement in the direction perpendicular
to the diaphragm surface, that is, in the lateral direction It is understood that it has occurred.
From this, it can be understood that in order to increase the high-frequency reproduction limit
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1
frequency and achieve a wide band, it is sufficient to increase the rigidity of the outer edge of the
vibrating plate in the lateral direction. However, as described above, the conventional diaphragm
has a constant thickness over the entire surface of the diaphragm. In addition, there is a
drawback that the high frequency reproduction limit frequency becomes a low frequency
because the thickness is small in order to reduce the weight and the rigidity in the lateral force
direction is low i. This invention is intended to eliminate the above-mentioned drawbacks, and in
order to raise the high frequency reproduction limit frequency, the outer peripheral part of the
material of the diaphragm is bent to be in close contact with the peripheral part of the
diaphragm. The edge portion of the case is reinforced. Hereinafter, an embodiment of the present
invention will be described with reference to the drawings. In FIG. 3 showing one embodiment of
the present invention, reference numeral 5 denotes a bent portion closely adhered to the
peripheral portion of the P-shaped diaphragm 1 and overlapped, and the other reference
numerals are the same as those in FIG. In fact, they have the same configuration. Then, the domeshaped diaphragm 1 is easily formed-in the process of press-forming the diaphragm, a member
of a size considering the bent portion 5 is molded, and then the vibration of this molded product
is made. The outer peripheral portion extending from the outer side of the plate 1 is bent, and
the bent portion 5 is finally brought into close contact with the peripheral portion of the
diaphragm 10 and overlapped.
Therefore, the peripheral portion of the diaphragm l has a thickness twice as large as that of the
central portion of the diaphragm 1), and the rigidity in the lateral direction is increased.
Moreover, as the whole of the diaphragm 1, the increase in weight is slight and the decrease in
efficiency is small. However, as a structure for the same purpose, it is considered to connect the
reinforcing ring to the connecting portion between the diaphragm and the bobbin Although this
method does not allow for a large increase in stiffness due to adhesive bonding of the reinforcing
ring. In this invention, the example shown in FIG. 3 in which the outer peripheral portion of the
material of the diaphragm is bent and overlapped on the inner surface of the diaphragm is
shown, but even if the bent portion is overlapped on the outer surface of the diaphragm, Similar
effects can be obtained. As described above, according to this invention, the outer peripheral
portion of the material of the diaphragm is bent, and the bent portion is brought into close
contact with the peripheral portion of the diaphragm and superimposed, so that the high
frequency reproduction limit frequency is achieved with a simple configuration. Can be increased
to increase the regeneration zone.
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