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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
speaker, and FIG. 2 is a cross-sectional perspective view showing a speaker according to an
embodiment of the present invention. '1 · · · · · · · · · · · · · 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · ((provided on the spider 9) Holes 9... (Provided in the frame), wherein the same reference
numerals in the figures indicate the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of the performance of a loudspeaker using a flat diaphragm. A conical shape has been generally
used as the diaphragm shape of loudspeakers for a long time, however, in the case of a conical
shape, the center of the diaphragm has a considerable depression compared to the peripheral
portion, so the peak on the sound pressure frequency characteristics (1 ) And dips have some
drawbacks. In order to prevent the disturbance of the characteristics due to the depression, the
shape of the h diaphragm may be a flat plate, but if it is simply a flat plate, the bending is likely
to vibrate and flat characteristics can not be obtained over a wide band. A generally known
method is to drive the (axisymmetric) -order divided vibration nodes of the flat plate diaphragm
with a voice coil to obtain good characteristics over a wide band. An example of the structure of a
flat panel speaker made in this way is shown in FIG. In the figure (11: diaphragm, (2): spider, (3):
voice coil, (4): frame, ts + # 'i plate. (6)はマグネット、())はヨークである。 The problem
with this speaker is that it is driving the nodes of the primary divisional vibration, so the voice
coil diameter is large (60 to 70 inches of the diameter of the diaphragm) and the diaphragm is a
flat plate. When 1) vibrates, the air flow on the back of the diaphragm 01 is swept by the spider
(2) and the frame (4), and the frequency characteristics of the reflection of the sound wave by the
spider (2) and the frame (4) (2) It is a point where disturbance, unnecessary braking due to air
flow resistance, and generation of non-linear distortion occur. In the present invention, as
described above, in order to prevent the deterioration of the performance due to the air flow
resistance on the back of the diaphragm, a plurality of holes are made in the spider, It is intended
to provide a high-performance speaker by making a plurality of holes in the frame below it and
reducing the air flow resistance on the back of the diaphragm. FIG. 2 is a perspective sectional
view of a speaker showing one embodiment of the present invention, where (I) is a diaphragm,
(2) is a spider, +31 tri voice coil, 14 + 1 ri frame, +51 is a plate, 16 H; t magnet, (7) is a yoke. A
plurality of holes (8) are provided in the spider (2), and a plurality of air vent holes (-) are
provided in the lower portion of the frame (4). According to the present invention, when the
diaphragm fi1 vibrates, the air on the back surface of the diaphragm fi1 is the air vent hole 8)
provided on the spider and the air vent hole (3) provided on the frame (3) 9) through the back of
the speaker, the air flow resistance of the back of the diaphragm is reduced, so to prevent the
occurrence of unnecessary braking and nonlinear distortion due to the air flow resistance that
has been a problem in the conventional speaker it can.
In addition, since the reflection of the sound wave by the spider (2) is small, the disturbance of
the characteristics due to the reflection can be prevented. In the above embodiment, the position
of the hole (8) thrown into the spider and the positional relationship between the hole (9)
provided in the frame are particularly described, but if the positions of both are matched, the
performance can be further improved It is overwhelmed. As described above, according to the
present invention, it is possible to obtain a high-performance speaker by comparison with the
conventional one by an extremely simple method.
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description, jps55155186
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