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JPS56161796

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DESCRIPTION JPS56161796
Description 1, title of the invention
Passive Lajeta system
3. Detailed Description of the Invention The present invention relates to a passive radiator type
sneaker system. By the way, in the case of general buff and reflex cabinets, the sound pressure
radiated from the boat is influenced by the resonance frequency of the duct itself, in addition to
the resonance frequency by the gear bit and the duct effective for improving the bass
characteristic, At this frequency, the radiation emitted from the hoed is distracted, resulting in an
overall characteristic asperity. The passive radiator system has a passive radiator, which is a
padding radiator having a considerable amount of debt in order to overcome the drawbacks as
described above. Somehow, in such a conventional system, it was necessary to replace the
hanosive radiator itself in order to change the characteristics. Therefore, it has been proposed
that the passive radiator be electromagnetically braked so that the request for the change of
characteristics can be met to such an extent that the request can be made without replacing the
patch radiator. . However, in this proposed system, 'EndPage: 1 needed to electromagnetically
brake the passive radiator' was provided separately from the magnetic circuit of the speaker to
provide the necessary magnetic flux, so a small speaker Inappropriate to apply to the system. The
present invention has been made in view of the above-described point, and an object thereof is to
provide a passive radiator type speaker system capable of braking a passive radiator to t
magnetic field and suitable for a small speaker. . An embodiment of the present invention will be
described with reference to the drawings. Reference numeral 10 denotes a diaphragm made of
cone paper or the like, which is attached to the inner reconnaissance frame 12 at its edge 11. A
voice coil 13 is wound around a povin 14 joined to the diaphragm 10. The voice coil 13, together
with the diaphragm 10 and the like, constitutes a vibrating portion of the speaker. A magnetic
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circuit 15 is provided with a yoke 16 and a plate 1T for applying a magnetic flux to the winding
coil 13 disposed in a magnetic gap formed between the permanent magnet 16 and the yoke 16
and the plate 11. There is. This magnetic circuit is supported by the inner frame 12 to which the
diaphragm 10 is attached, and constitutes a speaker together with the vibration sensor. Such an
e-configured loudspeaker is mounted via the outer 1i1ii frame 18 supporting the magnetic
circuit, the cabinet 19 and the cabinet 19. A passive lathe 20 is attached to the inner and outer
frames 12 and 18 by edges 21 and 22, respectively, so that it is concentrically tti # to the outside
of the follower 4ti 1.0.
A coil 23 is disposed in the leakage flux generated on the outside of the magnetic circuit
described above, and the interlocking relationship with the Punci Bragage 20 is connected to the
connecting bar 25 connected to the Povin 24 where the coil 23 is wound. Is linked to The lead
end of the coil 23 is connected to a terminal (not shown) of the cavity 19. By the way, since the
coil 23 is disposed in the leakage flux as described above, the influence of the coil 23 on the
magnetic flux in the magnetic gap in which the ten-ear coil 13 is disposed can be ignored. The
permeance in the vicinity of the outermost periphery of the yoke 16 is about 20 to 30 of the
permeance (about 200) of the magnetic air gap (about 200), so that the magnetic flux density is
about 1/20. As described above, even if the magnetic flux density is small, the conductor
effective length of the coil 23 can be made large, so that a large braking force can be obtained.
Reference numerals 12 ', 18' and 25 'denote vents formed in the inner frame 12, the outer frame
18 and the connecting part 25 to allow air to enter and exit, and 26 and 21 are dampers. FIG. 2
shows a modification j in which the auxiliary iron piece 28 is disposed so as to move the coil 23
between it and the yoke 16 in order to collect the leakage flux of the magnetic circuit. Next, the
above-described speaker system is activated. Now, assuming that the coil 23 is open at the
terminal of the cabinet 19 described above, the bass-less jigsaw 20 vibrates in response to the
back pressure of the diaphragm 10 in the same manner as the passive radiator in the
conventional speaker system. Emits sound pressure with a peak at This radiation sound n- is as
shown by a broken line in FIG. 3 and is added to the sound pressure from the speaker main body
(not shown) to give an output back pressure frequency characteristic as shown by a solid line. In
FIG. 3, one-dot broken line indicates the input impedance of the voice coil. By the way, when the
variable capacitor 30 is connected to the terminal of the coil 23 to form a closed circuit as shown
in FIG. 4 (a), the coil 23 connected to the passive tactic device 20 through the connecting bar 25
is Due to the above-described oscillation of the passive radiator 20, the current generated based
on Fleming's right-hand rule flows in the L closed circuit. Therefore, according to Fleming's lefthand rule, the coil 23 placed in the leakage flux exerts a force in the direction opposite to the
direction in which the passive radiator 20 is moving, and the passive radiator 20 is braked. It
becomes H state.
By the way, although the magnitude of the braking 3 is proportional to the magnitude of the
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current flowing through the coil 23, the capacitor 30 allows more current to flow at a higher
frequency than a lower frequency, so the braking in this case is at a higher frequency Larger,
smaller at lower frequencies. Therefore, the radiation sound pressure of the panci bragator in
this case changes from the broken line state when the coil 23 is open to the solid line state as
shown in FIG. 3 ('b'), and accordingly the speaker system The overall characteristics of the solid
line also change from the broken line state to the solid line state as shown in FIG. 4 (C). Further,
also when the capacity r2 of the capacitor 30 is obtained, the radiation sound pressure of the
passive radiator and the overall characteristics of the system are accordingly obtained. For
example, when the capacity is increased, the peak of the radiated sound pressure of the passive
radiator becomes lower than that shown in the figure, and the overall characteristics change
accordingly. Next, when the variable inductor 31 is connected to the terminal of the coil 23 to
form a closed circuit as shown in FIG. 5 (IL), the coil 23 shown in (b) and (C) by the broken line is
opened. The combination sound pressure of the speaker and the emission sound pressure of the
pan shi bragita at the time change to the higher frequency side contrary to the case of the
capacitor 30 as being not shown by the solid line. Then, for example, when the inductance of the
inductor 31 is increased, the peak of the radiation sound pressure of the passive radiator
becomes higher than that of the noise (n), and the coupling characteristic also changes
accordingly. As shown in FIG. 6 (a), in the case of a closed circuit in which the 0T variable
resistor 32 is connected, the peak of the radiation sound pressure of the passive radiator is
simply lowered as shown by the solid line in (b,). By itself, for example, as the resistance value is
increased, the state of the broken line approaches and finally becomes the same as the state of
the broken line at the time of opening. Of course, also in this case, a change as shown in (0)
occurs in the overall characteristics of the speaker. FIG. 7 shows the changes in the radiation
pressure of the passive radiator and the general characteristics of the speaker when the voice
current supplied to the voice coil 13 of the speaker is also supplied to the coil 23 to (a) and (0)
respectively. There is. As described above, according to the present invention, since the carp tk
disposed in the leakage flux of the magnetic circuit of the speaker and the passive radiator are in
an interlocking relationship to Mt 3, the magnetic circuit for braking is provided separately from
the magnetic circuit of the speaker A passive radiator system speaker system that is compact and
cost-effective because it allows electromagnetic braking of passive radiators without having to be
6, and that can be applied to enhance low range such as a radio cassette with insufficient low
range. Can be provided.
EndPage: 3
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view showing an embodiment of a
passive radiator type speaker system according to the present invention, and FIG. 3 is a crosssectional view showing a modification of a part of FIG. Is a graph showing changes in sound
pressure and impedance with respect to frequency in the absence of electromagnetic braking,
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and FIGS. 4 to 1 are graphs showing changes in characteristics due to differences in the manner
of electromagnetic braking. 15 ......... permanent magnet 16,. --- ... coil. Fig. 1 Fig. 2 Markings for
writing (0 Fig. 7 (0) (b) EndPage: 4
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