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JPS5414724

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DESCRIPTION JPS5414724
The present invention is characterized in that the thickness of the outer edge of the solid
diaphragm foam resin for sound is thickened to a position close to the outermost periphery of
the cone and is rapidly reduced at or near the outermost periphery of the cone. The Sound
diaphragm.
2, the scope of claims
5 Detailed Description of the Invention The present invention is a foam resin-filled electroacoustic transducer. It relates to a diaphragm. Since the cross-sectional shape of the outer edge
portion of the foamed resin of the conventional acoustically-filled diaphragm is V-shaped
determined by the opening surface of the cone and the cone, the thickness of the cone is
relatively relatively reduced to reduce weight. In the case of thinning, the outer edge may
resonate when a large input is applied because the outer edge is mechanically weak. In the
present invention, the thickness of the outer edge portion of the foamed resin is thickened to a
position near the outermost periphery of the cone. The above-mentioned conventional drawbacks
are solved by rapidly reducing the value at or near the outermost periphery of the lens. FIG. 1
shows a cross section of an embodiment of the acoustically filled diaphragm according to the
present invention, in which a foam resin 4 is filled and formed on the surface 5 of the side of the
cone 1 facing the sound field 2. . That is, the thickness of the foamed resin 4 is reduced toward
the outermost periphery within the range between the sound wave radiation or incident surface
5 and the surface 3, and the foamed resin 4 is located at or near the outermost periphery 1 ′ of
the cone. In the axial direction of the diaphragm 1, the thickness is formed so as to suddenly
become zero from a certain thickness. Due to the above configuration, even when a relatively
large input is applied to the electroacoustic transducer, the cone 1 °, the foamed resin 4 and the
outer edge portion of the acoustically-compensated diaphragm may resonate in many cases. You
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can get rid of it. The example above is to increase the thickness of the entire foamed resin in
order to increase the thickness of the outer edge portion of the foamed resin, but emphasizes the
so-called front chamber effect so much. If not, only the outer peripheral edge of the foamed resin
is annular. It may be thick. Further, as shown in FIG. 2, the foam resin 7 may be formed on the
surface of the surface 6 opposite to the surface 5 of the endPage: 1-710. . In this case, the sound
is enhanced regardless of the front room effect. The outer edge of the diaphragm can be made
thicker. る。 As mentioned above, according to the present invention, electricity. The thickness of
the outer edge portion of the foam resin of the solid diaphragm of the pneumoacoustic
transducer is thickened as close to the outermost periphery of the cone, and the thickness of the
outermost periphery is rapidly reduced in the vicinity thereof. Therefore, it is possible to prevent
the outer edge portion of the solid diaphragm from resonating in practical use even at a
relatively large input when the thickness of the cone is reduced as compared with the
conventional product. There are advantages to
4. Brief description of the drawings Fig. 1 shows the acoustic diaphragm-according to the present
invention. FIG. 2 is a cross sectional view showing an embodiment, and FIG. 2 is a cross sectional
view showing another embodiment. 1: Vibrating plate, 2: Sound field, 4.7: Foam resin.
243/1−21! 1EndPage: 2
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