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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a conventional
loudspeaker, FIG. 2 is a longitudinal sectional view of the loudspeaker according to the invention,
FIG. 3 is a sectional view taken along the line I-I of FIG. Is a sound pressure-frequency
characteristic diagram inside the chamber, and FIG. 5 is a characteristic diagram showing a
transient response inside the chamber. In the figure, reference numeral 1 denotes a diaphragm, 9
denotes a chamber, 10 denotes a frame, 11 denotes a sub-frame, 12 + tJL, and 13 denotes a
partition. In the drawings, the same reference numerals indicate the same or corresponding
DETAILED DESCRIPTION OF THE INVENTION The invention of the invention relates to a frame
and a sub-frame-from a diaphragm (a chamber on the back of a chamber 11 (a cone (91) is
related to a cone-shaped loudspeaker hb. In general, as shown in FIG. 1 in a cone-shaped speaker
which is totally blind in the space between the diaphragm (11 and the frame (10)), a space is
provided between the diaphragm (11 and the frame (1o) The internal sound pressure in the
space is abnormally high due to the vibration IJ given to the diaphragm 9, (1) One -'- El and 7 4 ·
// L in FIG. 4 by the broken line The cavity resonance as shown occurs, and as a result, as shown
in FIG. 5A, after the vibration of the diaphragm is stopped, the main vibration remains and the
transient response of the speaker itself is deteriorated. This invention is to eliminate the above
disadvantages i. It is an object of the present invention to provide a cone-shaped speaker which is
capable of removing hollow resonant gold by utilizing a plurality of chambers all together and
making full use of resonance by the chambers and the through holes (12). Hereinafter, the
illustrated embodiment will be described. FIG. 2 is a longitudinal sectional view of the
loudspeaker according to the present invention, and FIG. 3 is a sectional view taken along the
line II of FIG. In FIG. 2 and FIG. 3, (II is a diaphragm having a cone shape, (5I is a voice coil fixed
to this diaphragm, (2+, +31 is a vibration system all formed by the diaphragm and the voice coil)
The dampers and edges that are held use high compliance so that low frequencies can be
reproduced. Reference numeral 141 denotes a cap, and (a button is a plate, an mFi magnet, and
L6) is a pole piece, and a magnetic circuit kllff is formed by H1F + tar. (21 (10 Ji 7 frame% (11)
11 subframes are attached to the frame (10). (9) is a chamber provided between the frame and
the sub frame and divided into a plurality of portions by the partition wall (13). ing. The present
invention is configured as described above. The sound absorption function using the through
hole (12) and the chamber 1ull together with the 111TI-absorbs the cavity resonance 1
generated at various frequencies as shown by the solid line in FIG. The back of the board l1ivC
raise the internal sound pressure rise all the effect of reducing the gold, and the diaphragm has
good linearity. As described above, the cone-shaped speaker according to the present invention
removes the cavity resonance due to the internal sound pressure generated on the back side of
the diaphragm by the resonance with the through hole (12) and the chamber (J). Thus, it is
possible to obtain a good transient response speaker.
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description, jps53154630
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