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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows one example of a phase-reversal type
speaker device according to the present invention, FIG. 1 is a central longitudinal sectional view,
and FIG. 2 is a speaker device according to the present invention and a conventional speaker
device. Is a diagram comparing the characteristics of 1・・・・・・キャビネット、2・・・・
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a phase-reversal
speaker apparatus having a duct provided in a cabinet. Generally, wood, paper, etc. are used 1-C,
because the material of the duct provided in the cabinet is generally large. This type of material
has a relatively hard and smooth surface, so that it can be purely acoustically or self-made as a
septum. 1 Theoretical study designed low-pass characteristics in the islet and designed jI seconds
It has the advantage of being easy. However, on the other hand, tube resonance is likely to occur
in the middle range, and unwanted harmful midranges are radiated from the ducts and birds, so
that the sound quality is significantly degraded. Therefore, in the past, the duct was bent or a
small hole was provided in the excess to contrive the pipe bending, but this too was not a
complete countermeasure. The present invention is intended to correct the above-mentioned
drawbacks, the first object of which is to prevent the tube collusion in the middle of the duct and
to prevent phase collapsing well from the unwanted harmful ducts. Satisfying to offer type
speaker price straight. The purpose of joy 2 of this invention is to provide a phase-reversal type
speaker device capable of providing an appropriate acoustic resistance to the surface of the duct
11 and adjusting the resonance sharpness in the low frequency band am frequency and
improving the low frequency characteristics. is there. Next, an embodiment of the present
invention will be described with reference to the drawings. fi + is a cabinet, (2) is a low frequency
speaker, +3) is a middle to high frequency sound speaker, and the above is a known structure. (4)
is a foam having open cells as a duct housed in the duct hole provided with the pressure of the
front plate of the above-mentioned cabinet) fi +. As an example of this foam, a continuous air / lI
foam concrete with a specific gravity of 0.3 to 0.6 was used. This open-cell foamed concrete is
one having a direct air permeability and a high acoustic resistance. Therefore, if a stack having
such properties is used as the duct (4), it has the same function as the conventional duct and can
control the low frequency characteristics. In addition, in the case of this duct <4>, the female is
relatively rough on the surface, and in order to disturb the flow of 9 beds, the duct (4) is torn
away to give an acoustic resistance, thereby providing low-pass characteristics. Low frequency
characteristics can be controlled. On the other hand, in the middle region, the sound absorbing
habit of this duct (4) is crystallized, so [the duct (4) does not operate as an acoustic tube and the
resonance of the strange tube is prevented. As a result, the generation of unwanted harmful midrange radiation from the duct (4) is prevented. The above continuous air 11 in FIG. 2! Fig. 6
shows the horseshoe number characteristics (1) and the radiation characteristics of the duct on
the speaker shaft in the case of using the duct of the foam conc II-t and the case of using the
conventional duct).
Fig. Cp ridge line shows a conventional duct, and a broken line shows the characteristic of the
duct according to the present invention. This device can prevent the mid-range radiation of the
duct from strangeness from the fact that the duct is made of the open-cell foam K as described
above, and therefore prevents the disturbance of the frequency characteristic by the resonance in
the mid-range. In addition to the ability to obtain flat characteristics, it has the effect of being
able to obtain optimum low-pass characteristics so that the duct can be given appropriate
acoustic resistance in the low-pass region.