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1Veno specification 1, Title of the invention
3. Detailed Description of the Invention The present invention relates to a phase-inverted speaker
system, in which the mutual radiation impedance generated between the diaphragm of the
speaker unit and the separately provided 12-page mass is made clear It is intended to enhance
the radiation efficiency in the low frequency range. 1 and 2 show a conventional phase-reversal
speaker system, in which 1 is a cabinet, 2 is a speaker unit mounted on the front, 3u field unit,
4U frame, 5 is a voice coil bobbin 6 is a damper, 7 is a dust cap, 8 is a diaphragm, 9 is an edge,
and 10 is a bass reflex port for phase inversion. As described above, in the phase-inverted
speaker system, sound waves are emitted from the front to the front of the cavity node 1
according to the vibration of the imaging plate 8 and from the back surface to the inside of the
cavity node 1 as well. Is radiated, and this is phase-inverted through the bass reflex port 1 o and
radiated forward of the cabinete 1. However, in such a conventional speaker system, since the
positions of the speaker unit 2 and the bass reflex port 1 o are separated, it occurs between the
diaphragm 8 of the loudspeaker unit 2 and the bass reflex port 1 o and EndPage: 13 / m The
radiation impedance is not very large, so that the radiation efficiency of the entire spill can stem
is substantially simply the sum of the radiation efficiencies that the loudspeaker unit 2 and the
bass reflex port 1o have individually. For this reason, there is a problem that the radiation
efficiency can not be increased particularly in the low frequency range. This is the same as in the
conventionally known drone cone type speaker system. The present invention provides a speaker
system which solves such a problem. An embodiment of the present invention will be described
below with reference to FIGS. 3 and 4. In FIG. 3 and FIG. 4, 11 is a cabinet, 12 is a speaker unit,
13 is a field portion thereof, 14 is a frame, 14a is an edge attachment portion annularly provided
on one side of the frame 14, and 15 is a boss. A coil coil 16, a damper 16, a dust cap 17, a
diaphragm 18, an edge 19 mounted between the outer periphery of the diaphragm 18 and the
tip of the edge mounting portion 14a, and an inner periphery and an outer periphery of the
diaphragm 21 are edge 21 , 22 are annular drone cones supported by. A through hole (not
shown) is provided on the frame 14 in the direction of the generatrix so that sound waves
radiated from the back surface of the diaphragm 18 into the cabinet 11 reach the tron cone 20
through the through hole. It is configured.
Since the positions of the diaphragm 18 and the drone cone 20 are close to each other in this
manner, the mutual implicance between the two becomes extremely large, and the radiation
efficiency of the entire speaker system can be increased to that of the diaphragm 18 and the
drone cone 20. The individual radiation efficiencies can be much greater than the sum, and the
sound pressure characteristics in the bass range can be improved. FIG. 5 shows a second
embodiment of the present invention, in which an annular through hole is provided all around
the frame 23 constituting the speaker unit 12 and this is used as a port 24 for phase inversion. It
is. Although several ribs 23a are provided in the port 24 to connect the outermost periphery of
the frame 23 with the inside, these ribs 23a do not disturb the air flow in the port 24 as much as
possible. It is hopeful that it will be five base pieces in such a shape. FIG. 6 shows a third
embodiment of the present invention, in which a through hole 25 is provided at the center of a
center pole (not shown) in the field portion 13 and the above through hole is provided at the
center of the diaphragm 18. A support cylinder 26 is provided coaxially with the shaft 25, and a
drone cone 28 is attached to the tip of the support cylinder 26 via an edge 27. Reference
numeral 29 denotes a frame. FIG. 7 shows a fourth embodiment of the present invention, in
which a port 30 for phase inversion is provided at the center of the diaphragm 18. Even if it
comprises like FIG. 5-FIG. 7, FIG. The substantially same effect as the embodiment of FIG. 4 can
be obtained. As mentioned above, since the present invention arranges the mass which produces
antiresonance with the compliance of a cabinet outside the edge of a speaker unit or the center
of a diaphragm, the mutual radiation impedance which arises between a diaphragm and a mass
To increase the radiation efficiency in the low frequency range.
4. Brief description of the drawings. 6 pages: FIGS. 1 and 2] are a front view and a sectional view
of a conventional example, and FIGS. 3 and 4 are front views showing a first embodiment 1 of the
present invention and FIG. Cross-sectional views, FIG. 5, FIG. 6, and FIG. Third. It is sectional
drawing which shows a 4th actual case. 11 cabinets, 12 speaker units, 13--field units, 14.23.29
frames, 15-voice coil terminals, 16--dampers, 17-dust caps, 18-diaphragms, 19 21 22 22. 27 · · ·
Etsuji 20.28 Drone corn, 24. . 30 · · D port for phase inversion. Name of agent Attorney Nakao
Toshio and others 1 EndPage: 2 Figure 1 2 Figure 2! Fig. 3 vS 5 / f Fig. 6 Fig. 7 End Page: 3
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