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JPS5357837

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DESCRIPTION JPS5357837
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a conventional speaker
system. FIG. 2 is a cross-sectional view showing a composite speaker according to the present
invention, FIG. 3 is a front view showing a speaker system using the composite speaker according
to the present invention, and FIG. 4 is a reproduction band frequency characteristic of the
speaker system. FIG. 11 ...... conical frame, 12 ...... passive diaphragm 20 ...... speaker unit, 31 ......
horn 0
DETAILED DESCRIPTION OF THE INVENTION In the present invention, a speaker unit having a
passive diaphragm and a magnetic circuit unit is coaxially and independently combined via one Q
frame, so that the low frequency reproduction limit of the above speaker unit can be reduced.
The present invention relates to a composite speaker whose number can be expanded. By the
way, known loudspeakers, in particular, horn-type loudspeakers, are superior in reproduction
characteristics in the high frequency range, but have a characteristic that the reproduction band
is narrow. Therefore, in order to widen the reproduction band in the reproduction band,
particularly in the low sound range, a method is known which solves the problem by increasing
the length of the horn attached to the front of the vibration system. However, there is a limit to
increasing the length of the horn as described above. For example, when the speaker is arranged
in a knee knit arrangement with another speaker for reproducing the low range or the like and
the baffle can be assembled into the cabinet, the size of the cabinet is limited. Furthermore,
positional deviation of the sound source may occur in relation to other speakers. A phasereversed drone cone speaker 4 is arranged in a cabinet 3 in which a speaker system is composed
of woo-1 which is a low range speaker and a tweeter 2 which is a high range speaker as shown in
FIG. Mounting so that it can resonate with the lowest resonant frequency 9 of the abovementioned woo-, the lowest resonant frequency f in this loudspeaker system. ? It is known to
expand the low frequency reproduction threshold frequency by lowering the frequency.
However, in the case of using this drone cone speaker, it is difficult not only to design the
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arrangement relationship of the unit arrangement of each speaker, but also the cabinet will
inevitably become thick 2-. Therefore, the present invention eliminates the drawbacks of the
conventional one as described above, and can prevent the positional deviation of the sound
source of each speaker when a plurality of speakers are unit-arranged, and is restricted by the
size of the cabinet. It is possible not only to reduce the size of the cabinet, but also to expand the
low frequency reproduction threshold frequency, and the magnetic circuit on the rear side of the
conical frame with the conical passive diaphragm attached. A speaker unit having a part is
mounted coaxially and independently with the passive diaphragm. Hereinafter, an embodiment of
the present invention will be described with reference to the drawings. FIG. 2 is a cross-sectional
view of the composite speaker 0 according to the present invention, in which 11 is a conical
frame attached to the baffle 12 having no conically formed magnetic circuit portion.
A flange portion 13 is formed on the opening side outer peripheral portion of the conical frame
11, and the passive diaphragm 12 is adhered and fixed together with the gasket 15 via an elastic
/ 14 provided on the opening outer periphery. There is. Furthermore, on the side of the neck
portion 16 of the frame 11, the side of the neck portion 17 of the above-described passive
diaphragm 12 is held via a damper 18. Thus, the rear side of the conical frame 11 to which the
passive stationary plate 12 is attached and to which the damper 18 is fixed is formed as the
cylindrical portion 19 and the proximal end of the cylindrical portion 190 is an inner
circumference of the cylindrical portion. A flange portion 21 serving as a portion is formed on
the mounting 9 of the speaker unit 20 bent in the direction. Then, a magnetic circuit portion 26
configured by joining a laminated body of a yoke 23 provided with the center pole 22, a ringshaped magnet 24 and a ring-shaped plate 25 to the flange portion 21, and a bobbin 27 A
speaker unit 20 is attached to the front of the diaphragm 29 with a dome-shaped diaphragm 29
on which the voice coil 28 wound around is suspended and a horn 31 having an equalizer 30 at
the center. ing. The speaker unit 20 is positioned so that the horn 31 faces the opening 33 on the
neck 17 side of the passive diaphragm 12 from the cylindrical portion 19 of the frame 11 and
coaxial with the passive diaphragm 12. The flange portion 34 on the proximal end side of the
horn 31 is attached so as to be joined to the flange 821 of the frame 11. The horn 31 and the
passive diaphragm 12 facing the opening 33 on the side of the neck 17 of the passive diaphragm
12 are provided independently of each other with an interval so as not to make contact 1-. As
described above, by mounting a speaker unit having a magnetic circuit portion on the rear side of
one frame, and mounting a passive diaphragm to be vibrated by the vibration of the speaker unit
on the front side, this passive diaphragm can be An effect similar to that obtained by extending
the horn can be obtained, and the size can be further reduced, so that the cutoff frequency of the
speaker unit can be lowered, and the low frequency reproduction limit frequency can be
expanded. Further, according to the present invention, since the 5-pack / bump diaphragm is
combined independently with the imaging system such as the diaphragm of the speaker unit,
there is no vibration with this diaphragm, so the There is no occurrence of modulation or
distortion in the range. Furthermore, the composite speaker according to the present invention is
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used for high-range reproduction and 1.
When the unit is arranged as a speaker for low-range reproduction in the pond, the driving point
position of the high-range reproduction speaker in the direction of the radiation axis of the sound
wave can be shifted backward from that of the -F recorded range reproduction speaker. It is also
possible to adjust the deviation of the drive position with respect to the listener. The speaker unit
20 combined with the composite speaker 10 according to the present invention is a tweeter
which is a high range reproduction speaker, and as shown in FIG. 3, a unit 44 'with a woofer 43
which is a low range reproduction speaker. When arranged, the lower frequency reproduction
limit number of the tweeter is expanded in the same manner as described above, and the lowest
resonance frequency f of the woofer 43. Can be lowered and the low frequency reproduction
limit frequency can be expanded to obtain the characteristics as shown in FIG. At this time, the
cutoff frequency of the tweeter and the minimum resonance frequency f of the woofer. Because
they are very far apart, they do not affect each other. Furthermore, as shown in FIG. 3, it is also
possible to make a speaker system smaller than the conventional drone cone speaker attached.
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