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Patent Director General Iku Takehisa 1; Name of Invention 3% Total Applicant 4 Attachment 1.
List of species ■ Japan Patent Office ■ JP 48-3i-9350 Date of publication d48. (1973) 4.26
Application for Japanese Patent Application No. 411151711 Application for filing application
(197 /) 1.27 Examination request not yet filed (3 pages in total) 1 description 1 description 1
invention name speaker 1 name speaker invention
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker and
to improving the reproduction frequency bandwidth of the loudspeaker on a ship. In order to
widen the reproduction frequency band 1] in the conventional speaker, the diameter of the
diaphragm and the amplitude are increased, and the support of the diaphragm is also sufficiently
considered (to match C). Was required to be designed. (2) The diameter of the diaphragm, the
amplitude, the amplitude of the output sound pressure level to keep each constant 8 to be added
with the magnetic flux applied to the Heus coil along with the expansion of the area "↑".
However, if the cost of manufacturing increases with the expansion of the area, and if it can be
installed in a case with a small internal volume, the stiffness due to the internal volume IV of the
case will increase. It is necessary to hold down the -L rise value of the lower limit frequency of
the reproduction low frequency, and it is necessary to use one with a heavy diaphragm weight,
resulting in a drawback such as a low output sound pressure level of 1 or the like. The present
invention was made to solve the above-mentioned drawbacks. Accordingly, a first object of the
present invention is to provide a speaker capable of widening the reproduction frequency
bandwidth and preventing the low one of the output sound pressure level 1F. A second object of
the present invention is to provide a speaker capable of reproducing a wide band without
affecting the output sound pressure level even if additional housings with a small internal volume
are added. Hereinafter, the embodiment of the present invention will be described in detail with
reference to FIGS. 1 and 2. It is a general direct radiation type speaker except for the resonance
system consisting of the vibration base 1, the peripheral part 2, and the network part 3 as shown
in FIG. 1, and the vibration system of the direct radiation type speaker has The diaphragm 1, the
peripheral portion 2, and the energy transfer -r3 are added at a frequency lower than the lowest
resonance frequency (fo2), and the oscillating plate 4 of the oscillating system and the oscillating
plate EndPage: 1l Connect by Further, the energy transmitter 3 has a flexibility not to inhibit the
movement of the vibration plate 1 of the resonance yarn, and the energy transfer loss from the
vibration plate 4 to the vibration plate 1 of the resonance yarn is A small substance (eg comb,
paper, etc.), and the mass of the diaphragm 1 and the peripheral portion 2 of the resonance
system is added to the diaphragm 4 of the vibration system at least the minimum resonance
frequency (fO 2) of the piston movement region of the vibration system. Not jealous of stiffness.
The vibration plate 4 of the vibrating yarn is at least one of the lowest resonance frequency (fo 2)
of the vibrating yarn formed by the vibration plate 1, the peripheral portion 2 and the energy
transmitter 3. The energy transferred to the energy transferr 3 from this becomes excitation
energy, and the energy emits sound pressure.
The diaphragm 1% Ji of the resonance thread by the vibration wave number (101) according to
the -F rise of the fl8 drum number! o The resonance of the edge 2 disappears, and the vibration
due to the vibrating plate 4 of the vibrating thread and the damper 5 is transferred to the
resonance. At the frequency of the rare earth resonance 8 number (fo 2) or more, the energy
transfer of the resonance yarn-\ by the energy transmitter 3 is not performed at all, and the
Yayoi JkJ drum number format is the resonance yarn The vibration plate 15 is determined
without being affected by the peripheral portion 2 and the energy transmitter 3 at all.
Accordingly, in the reproduction frequency characteristic, as shown in FIG. 2, the inside of the
band is expanded by the resonance peak of the resonance frequency (fol), and at the lowest
resonance frequency (fo2) or more, the diaphragm 11 of the resonance system 2. Since the
energy transferr 3 does not operate at all, it matches the reproduction frequency characteristic of
the vibration system (direct emission type, speaker). As described above, according to the present
invention, the reproduction frequency band can be expanded and the low 1 of the output sound
pressure level can be prevented, and furthermore, the reproduction in a wide band can be
achieved even if attached to a small internal volume housing. h) can be used to prevent the low
level 1 of the output upper pressure level, and in the history, the size of the loudspeaker can be
made smaller than that of the conventional one.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an embodiment of a loudspeaker according to
the present invention, and FIG. 2 is a gang wave performance of the embodiment. J diaphragm, 2
ground edges, 3 energy transmitters, 4 diaphragms, 5 dampers. Patent applicant Pioneer
Corporation 'J-i2 Figure EndPage: 25 Inventors other than the above (I) Inventors End page: 3
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