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DESCRIPTION JPS5755693

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DESCRIPTION JPS5755693
Description 1, title of the invention
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3. Detailed Description of the Invention The present invention is to realize a high efficiency
speaker by .tau. Using multiple stages of acoustic or mechanical filters. Fig. 1 shows a speaker
with a mechanical filter to which the applicant filed earlier, 1 being an edge. 2 is a main
diaphragm, 3 is a sub-edge, 4 is an auxiliary diaphragm, 5 is a dust cap, 6 is a lid for sealing the
tip of the voice coil bobbin 12, 7 is a cover, 18 is a frame, 9 is a plate, 1o is a magnet 11 is a
plate, 12 is a voice coil bobbin, and 13 is a voice coil. In the above configuration, the air in a
portion V surrounded by the main diaphragm 2, the subassembly 3, the sub diaphragm 4, the
voice coil bobbin 12, the lid 6 and the dust cap 6 does not leak to the outside. This portion acts
as a kind of mechanical filter, and its equivalent circuit is as shown in FIG. That is, in FIG. 4, F is
the driving force, C, C2 ░ C., compliance of the fd vibration system, C3 is the compliance of the
filter, M1 is the drive-side vibration mass, and M2 is the diaphragm-side vibration mass. The
sound pressure frequency characteristic of such a speaker is as shown by the solid line A in FIG.
7, and the Q at the filter frequency is high, and a speaker with high efficiency can be obtained.
However, with this speaker, the attenuation in the band above the filter frequency is large, and it
is impossible to obtain a high efficiency speaker over a wide band. The present invention
provides a speaker that solves such conventional problems. An embodiment of the present
invention will be described below with reference to FIG. In FIG. 2, the parts denoted by the same
reference numerals as in FIG. 1 have the same functions. Reference numeral 14 denotes a second
filter made of an elastic material such as "/ fft" L -f installed between the auxiliary diaphragm 4
and the voice coil bobbin 120. EndPage: As shown in FIG. 5, the equivalent circuit of FIG. 2 is the
mass M1 of FIG. 4 as the vibrating mass M of the voice coil 13 side. And the vibration mass M1
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on the side of the auxiliary diaphragm 4, and the compliance by the second filter 14 is Co. The
sound pressure frequency characteristic of such a speaker is as shown by a broken line B in FIG.
7, and it can be seen that the efficiency of the high region is increased by the resonance Q of the
filter frequency of the second filter 14. Further, when a corrugation 15 as shown in FIG. 3 is
formed on the voice coil 13 side / 12 of the speaker of FIG. 2 and a third filter is configured, the
equivalent circuit becomes as shown in FIG. The characteristics are as shown by the dasheddotted line C in FIG.
In FIG. 6, Mo1 represents the quality i from the corrugation capacitor 15 to the voice coil 13, the
mass from the Mo ha gorge si con 15 to the second filter 14, and the mechanical compliance of
the Co1 ha gorge sion 16. In this way, when the loudspeakers are multistage-filled, highefficiency loudspeakers can be obtained over a wide band by Q of each filter frequency. The
speaker shown in FIG. 1 originally has high efficiency in the low band compared to the
conventional speaker, and when incorporating this together with a high sound speaker etc. into a
multi-way speaker system, a high efficiency high sound speaker is required. Furthermore, since
the speaker in FIG. 1 has a narrow band, it is necessary to lower the high-tone speaker to the
low-frequency band, and the performance required for the high-tone speaker becomes severe. As
a result, there is a problem that the total fishing cost increases. According to the present
invention, as shown in FIGS. 7B and 7C, the band can be broadened without largely changing the
characteristics of the low band, so that the efficiency of the low band of the high-tone speaker is
not high enough. Multi-way speaker system can be built, and the overall cost can be reduced. In
the above embodiment, the case where the mechanical filter and the acoustic filter are combined
to provide two or more stages of filters has been described, but only the mechanical filter may be
used in multiple stages, as shown in FIG. A cabinet 18 incorporating a force 16), a diaphragm 18
and an opening 19 may be provided to constitute a multistage acoustic filter. Further, as a
method of providing mechanical filters in multiple stages, there are various methods such as
providing corrugations on the voice coil bobbin 12 in multiple stages, or providing sub-vibration
plates 4 on the multi-stage corrugations. The same effect as that of the embodiment of FIGS. 3
and 8 can be obtained. As described above, according to the present invention, mechanical or
acoustic filters can be provided in multiple stages, and high-efficiency speakers can be realized
over a wide band by using Qi of those filter frequencies.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of the prior art, FIG. 2 is a
cross-sectional view of one embodiment of the present invention, and FIG. 3 is a perspective view
of the main part of the second embodiment of the present invention. 4, FIG. 5, FIG. 6 are
equivalent circuit diagrams of FIG. 1, FIG. 2 and FIG. 3, respectively, and FIG. 7 is the sound
pressure frequency of FIG. 1, FIG. FIG. 8 is a cross-sectional view of the fourth embodiment of the
present invention. 1 и и и и и и и и и и и и и Main diaphragm, 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 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
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ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ...... voice coil bobbin, 13
... ... voice coil, 14 ...... second filter, 15 ..... corrugation (third filter), 16 ... ... Speakers 17... Cabinets
18. Name of agent Attorney Nakao et al. 1 person EndPage: 2 Fig. 1 3 Fig. 2 Fig. 3 Fig. 5 Fig. 7 ?
? 8 EndPage: ?
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