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The present invention Q threshold system improves threshold number improvement of the
number of cases. The embodiment shown in FIGS. 1 and 2 (C is described, and FIG. 1 is a view
from the front (the upper side of FIG. 2) of m2 (without the + ti moving plate 3 of 1)・ The two
types of pipes of 9 / and the closed pipe are acoustically (in consideration of the open end
correction), the open pipe / and the closed pipe are arranged in a checkered manner, and the cut
area is The sum is approximately equal between the two species, and FIG. 2 shows the cross
section of the longitudinal or lateral central plane of FIG. By the arrangement of FIG. 1 and FIG. 2,
of the sound waves generated by the vibration of the diaphragm 3, the one directed backward
(FIG. 2 downward) K is reflected at the back of each tube and is subjected to vibration analysis
“7i! Although i ′ ′ comes back, its phase is opposite (open / closed) and difference in ユ j '(/
gtj difference) so that the two reflected waves cancel out both types of phase and do not affect
the diaphragm. This is the same effect as a river with an infinite baffle board. At high frequencies,
the reflectance at the back end of the open tube decreases to cause a difference between the
closed and α reflections, but when a semi-absorbent material such as a cloth break is applied
inside the closed end of the closed tube, As the amount of reflection there decreases, the
influence on the diaphragm is reduced. The sound waves emitted to the outside from the rear
end of the dehiscence are highly directional and do not reach the front of the diaphragm.
According to the present invention, it is possible to eliminate the distortion sound wave in the
rear by a relatively simple and compact device to vibrate the diaphragm without distortion.
Brief description of the drawings
FIG. 1 is a front view of the embodiment, and FIG. 2 is an I prayer 1 @ view by the vertical or
horizontal center plane of FIG.
In the figure / · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 曲 曲 − − −-吸収 吸収 吸収 出 願 輪 輪 図
1 figure Manual correction Showa 5g September t 6 / Display of case Patent application for
patent application No. Yu 009. Name of invention, speaker system with reflection-g 3 lyj
relationship with person's hand to make correction Patent applicant's residence Tokiwacho 2chome, Numazu City Target of correction Description and drawing S Contents of correction
Although various diaphragm drive methods can be considered, conversely, a reflection tube
group having a structure corresponding to the existing speaker unit can be easily considered. For
example, for a cone type diaphragm, there are examples shown in FIG. 3 and FIG. FIG. 3 is a
cross-sectional view, and FIG. 9 is a front view (from the lower side of FIG. 3). FIG. 3 is a cross
section taken along the line A-A of FIG. In FIG. 9, the magnet and the cone are omitted1. In this
tube group, the shape of each tube cut is not the same, but the area is almost the same. BRIEF
DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of the embodiment with the diaphragm
removed, and FIG. 2 is a cross-sectional view taken along the longitudinal or lateral central plane
of FIG. FIGS. 3 and 4 show an application example to a cone-and-well diaphragm, and FIG. 3 is a
cross-sectional view and FIG. In the figure: open pipe 2: closed pipe 3: imaging plate ll: l material
(2) Correction of the drawing Add the attached drawing (Fig. 3 Fig. Q). More than the above
Corrective correction February n, 1984 Patent application No. 200933 2, Title of invention
Speaker system with reflecting tube 3, Relationship with person making correction Patent
applicant address Nukazu Tokiwamachi, Numazu City 2-chome address 4, target of correction
Specification 5, content of correction specification r2. % Claimed area Revised as shown below. 2.
In the device for making the diaphragm sound by forced excitation, the acoustic length of the
closed tube is approximately equal, and the open tube is the sum of the cut area of the closed
tube is the open tube cut! A sound generation system characterized in that one or more mixed
tube groups of tube groups collected so as to be approximately equal to the sum of I'lPk are
placed behind the diaphragm.
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description, jps5991799
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