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JPS5366936

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DESCRIPTION JPS5366936
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic longitudinal side view of a
conventional soft dome-shaped speaker, and FIG. 2 is a longitudinal sectional view of one
embodiment of the diaphragm of the present soft dome-shaped speaker, FIG. FIG. 3 is a diagram
showing frequency characteristics of a speaker using a diaphragm according to the present
invention and frequency characteristics of a speaker using a conventional diaphragm. 1
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DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a die 77 ram of a
soft dome-shaped speaker, which is formed by overlapping a cloth and a thin elastic sheet and
press-molding the same to improve the frequency inertia with a uniform thickness. -It aims at
providing a diaphragm of a dome shape speaker. As shown in FIG. 1, a diaphragm 1 of a general
soft dome-shaped speaker is a soft dome-shaped member and is attached to a frame 5. When a
signal current flows through the voice coil 2, the diaphragm 1 vibrates together with the coil 2 to
generate a speaker. The conventional soft dome shaped speaker diak (1) moat-toss T>. Harm! As
the mold, a cloth in which a comb resin or the like is applied to a press-molded cloth in a
predetermined spherical shape, and a book in which a cloth is coated with an adhesive on a
press-molded cloth in a predetermined spherical shape are used. . However, diaphragms coated
with rubber-based resin etc. on cloth have poor workability, and it is difficult to apply resin
uniformly, and there are drawbacks such as not being able to obtain uniform sound pressure, etc.
Diaphragms in which a cloth is coated with a sealant are likely to cause shibin holes due to
variations in the coating process, the thickness of the coating surface is likely to be uneven, and
uniform sound pressure can not be obtained. The present invention eliminates the abovementioned drawbacks, and an embodiment thereof will be described with reference to FIG. FIG. 2
shows a longitudinal side view of an embodiment of the diaphragm of the soft dome speaker
according to the invention. As shown in the twenty-first, the diaphragm 1 according to the
present invention is formed by press-molding a cloth 5 impregnated with a phenol resin and a
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thin butyl-based rubber sheet 4 with a uniform thickness into a predetermined spherical shape.
このため。 A vibrating surface of uniform thickness can be obtained, and since no coating
process as described in (1)) follows, no pinholes occur and no air leaks. Fig. 5 shows the
frequency sensitivity when the diaphragm according to the present invention is used for a soft
dome-shaped speaker and the grain size numbering when a diaphragm filled with a conventional
sealant is used for a soft dome-shaped speaker Figure shows a comparison of As is apparent from
the figure, the vibration surface of the five invention diaphragms has a uniform thickness as is
apparent, so the output sound pressure frequency characteristics (curve I) of the speaker using
the invention diaphragms are the frequency characteristics when using the conventional
diaphragm (Curve N) Compared to K, it shows excellent characteristics with smooth peak and
smooth, and since the one-invention diaphragm has no air leakage, the fifth harmonic distortion
characteristic (curve I of the speaker using the inventive-invention diaphragm) ) Is improved as
compared to the characteristics (curve ysy) when using a conventional diaphragm.
As described above, the diaphragm of the soft dome-shaped speaker according to the present
invention is formed by overlapping the cloth and the thin elastic sheet with (3) and freding into a
predetermined shape, so that a vibrating surface with a uniform thickness is obtained. Air
leakage does not occur because pinholes and the like do not occur. Therefore, it is possible to
configure a speaker with smooth output sound pressure level characteristics with less fifth
harmonic distortion, etc. Has features
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