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JPS5327842

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DESCRIPTION JPS5327842
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
speaker, and FIG. 2 is a cross-sectional view of a main part of the speaker in an embodiment of
the present invention. 1
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ?иии Voice
coil, 7 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и dust cap, 12 и и и и и
diaphragm.
DETAILED DESCRIPTION OF THE INVENTION The present invention is to provide a speaker in
which the Enon resonance of the diaphragm is prevented and the deterioration of the sound
quality does not occur. A conventional cone-shaped loudspeaker will be described with reference
to FIG. In FIG. 1, 1 is a yaw, 2 is a magnet fixed in the yaw 1, 3 is a center pole fixed to the upper
surface of the magnet 2, and between the end of the yoke 1 and the center pole 3 Magnetic) 42.
??? A gap is formed. A bobbin 4 is supported by a damper 5 so as to be movable up and
down. A voice coil 6 is wound around the bobbin 4. A frame 7 is fixed to the upper surface of the
yoke 1 and a diaphragm 8. A central portion of the diaphragm 8 is fixed to the bobbin 4.
Reference numeral 9 denotes a corrugation formed at the edge of the diaphragm 8. The
outermost periphery of the diaphragm 8 is held between the cascade 1o and the frame 7.
Further, 11 is a dust cap attached to the upper end of the bobbin 4. As described above, in the
conventional speaker, the corrugation 9 is formed at the edge of the diaphragm 8 so that the
diaphragm 8 can move easily, but the wave propagating through the diaphragm 8 as indicated by
the broken line is Although the clap portion of the diaphragm 8 and the corrugation 9 are
formed, a wave propagating through the diaphragm 8 as indicated by a broken line is reflected at
the boundary between the clamp portion of the diaphragm 8 and the corrugation 9 and edge
resonance occurs. Wake up. Such edge resonance degrades the frequency characteristics of the
speaker. As described above, when the movable part of the diaphragm suddenly becomes a fixed
end, reflection occurs and the origin of the edge resonance: a wedge. The present invention
12-05-2019
1
attempts to prevent the reflection by making the mechanical impedance of the edge portion of
the diaphragm or a slightly larger value as it goes to the fixed end, that is, by preventing the
movable part of the diaphragm from becoming a fixed end suddenly. One embodiment of the
present invention will be described below with reference to FIG. In FIG. 2, reference numeral 12
denotes a diaphragm, and the shape of the edge portion of the diaphragm 12 becomes larger as
it goes to the thickness t or to the outer peripheral part. The outermost peripheral end face of the
diaphragm 12 is connected to the inner peripheral surface of the gasket 1o. As described above,
when the thickness of the diaphragm 12 is increased toward the outer peripheral side, the
impedance is slightly increased toward the outer peripheral side, and the Enon portion with (the
end resonance can be prevented, and the speaker Of the frequency characteristics of the
12-05-2019
2
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