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JPH0416099

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DESCRIPTION JPH0416099
[0001]
FIELD OF THE INVENTION The present invention relates to a passive radiator with an improved
degree of freedom for controlling the frequency characteristics of the low frequency range. 2.
Related Art In recent years, in a small stereo device, it is intended to reproduce a pleasantly
audible bass rather than smoothly extending the frequency characteristics of the bass, and to
emphasize some effective frequencies. Control of frequency characteristics is also required.
Heretofore, in order to control the frequency characteristic in the low frequency range, a passive
radiator system having a greater degree of freedom than the bass reflex system has been used.
The conventional passive radiator will be described below. FIG. 4 is a cross-sectional view
showing the structure of this conventional passive radiator. In FIG. 4, an edge 12 and a damper
13 are attached to the frame 11. The diaphragm 14 is supported at its peripheral portion by the
edge 12 and at its central portion by the damper 13. Further, the center cap 15 is attached to the
surface of the diaphragm 14 and covers the hole at the center of the diaphragm 14. Hereinafter,
the operation of the passive radiator configured as described above will be described with
reference to FIG. FIG. 5 is an electroacoustic equivalent circuit when a speaker unit and a
conventional passive radiator are attached to a cabinet. In this figure, MLCl and R1 are
respectively the effective vibration mass of the vibration system of the speaker unit, the support
system compliance, the mechanical resistance and the electromagnetic braking resistance. M2.
C2 and R2 are respectively the effective vibration mass of the vibration system of the passive
radiator, the support system compliance, and the mechanical resistance. C3 is the compliance of
the volume inside the cabinet. Sl and S2 are an effective vibration area of the speaker unit and an
effective vibration area of the passive radiator. ここで、M2. A parallel resonant circuit of C2,
R2 and C3 is formed, the impedance of the parallel resonant circuit becomes very small at this
resonant frequency, and a large current flows in the entire circuit. That is, the diaphragm of the
passive radiator resonates at this frequency to emphasize the bass. Although there is no C2 in the
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case of the bass reflex system, the C2 can be changed in the case of the passive radiator system,
so the degree of freedom in controlling the frequency characteristic of the bass region is larger in
the passive radiator system than in the bass reflex system. . SUMMARY OF THE INVENTION
However, in the above-mentioned conventional passive radiator, as shown in FIG. 6, only the bass
region can be emphasized in the vicinity of one frequency, and when there are two frequencies to
be emphasized, electrical It is necessary to take measures such as adding a correction to the
system or using a complicated cabinet system, which has a problem in that the cost is high.
An object of the present invention is to solve the above-mentioned conventional problems, and it
is an object of the present invention to provide a passive radiator that can emphasize two
frequencies in the bass range without increasing the cost. Means for Solving the Problems In
order to achieve this object, the passive radiator of the present invention comprises a frame, an
edge and a damper attached to the frame, a peripheral portion supported by the edge, and a
central portion by the damper. And a diaphragm supported at a central portion of the diaphragm
to form a port through which the diaphragm is supported. In the present invention, with the
above-described configuration, the diaphragm of the passive radiator resonates at a certain
frequency in a low frequency range, and air at the port portion of the diaphragm central portion
resonates at another frequency, thereby increasing cost. One frequency can be emphasized.
Embodiments Hereinafter, one embodiment of the present invention will be described with
reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of a passive
radiator according to an embodiment of the present invention. In this figure, 1 is a frame and 2 is
an edge. Denoted at 3 are dampers, each attached to the frame 1. A diaphragm 4 is supported at
its periphery by the edge 2 and at its center by the damper 3. Then, a port 4 ° a through which
the central portion of the diaphragm 4 is formed is formed. The operation of the passive radiator
of the present embodiment configured as described above will be described below with reference
to FIG. FIG. 2 is an electroacoustic equivalent circuit when the speaker unit and the passive
radiator of the present invention are attached to a cabinet. In this figure, Ml. C1 and R1
respectively represent the effective vibration mass of the vibration system of the speaker unit,
the support system compliance, the mechanical resistance and the electromagnetic braking
resistance. M2. C2 and R2 are the effective vibration system mass, support system compliance,
and mechanical resistance of the vibration system of the passive radiator, respectively. C3 is the
compliance of the volume inside the cabinet. M3. R3 is the effective vibration mass of the port
air in the center of the passive radiator diaphragm and the dynamic friction resistance with the
inner wall of the port. SL、S2. S3 is the effective vibration area of the speaker unit, the
effective vibration area of the buff blunter, and the effective vibration area of the port air of the
central portion of the passive radiator diaphragm. ここで、M2. A parallel resonant circuit of
C2, R2 and C3, M3. A parallel resonant circuit of R3 and 03 will be formed. The two parallel
resonant circuits are mainly M2. By designing C2 and M3 appropriately, it is possible to resonate
at two independent frequencies.
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As a result, the impedances of the parallel resonant circuits become very small at two
frequencies, and a large current flows in the entire circuit. In other words, the diaphragm of the
passive radiator resonates at one frequency, and the air at the port portion of the central part of
the passive radiator diaphragm resonates at another frequency, and two frequencies in the bass
range are emphasized. It is. In addition, although the central portion of the diaphragm is longer
by forming a port as compared with the conventional passive radiator, no cost increase is caused
because the center cap is unnecessary. FIG. 3 is a frequency characteristic when the passive
radiator of the present invention is attached to a cabinet together with a speaker unit. Further,
FIG. 6 shows frequency characteristics when the conventional passive radiator is attached to the
same cabinet together with the same speaker unit. In both FIGS. 3 and 6, the speaker unit has a
diameter of 10 cm, an effective vibration area S1 of 500, and a cabinet internal volume of 10 ×.
In addition, the aperture of the passive radiator is 16 cm and the effective vibration area S2 is
1330. In the case of the conventional passive radiator shown in FIG. 6, only around 60 Hz is
emphasized, but in FIG. 6, the effective vibration mass M2 of the vibration system of the passive
radiator is 32 g, the support system compliance C2 is o, ooo . The average internal diameter of
the port at the center of the 4 m / N% passive radiator diaphragm is 38 38 m ffh Length is 53
mm. , 60 Hz and 150 Hz are emphasized. As described above, the present invention comprises a
frame, an edge and a damper attached to the frame, and a diaphragm supported at its periphery
by the edge and at its center by the damper. By forming a port through which the central portion
of the diaphragm penetrates, the diaphragm itself resonates at one frequency, and the air at the
port portion of the diaphragm central portion resonates at another frequency, which increases
the cost It can provide a passive radiator that can emphasize two frequencies in the low
frequency range without having a large practical effect.
[0002]
Brief description of the drawings
[0003]
Fig. 1 is a cross-sectional view showing the structure of a passive radiator according to an
embodiment of the present invention, and Fig. 2 is a frequency characteristic diagram when the
passive radiator according to the present invention is attached to a cabinet with a speaker unit.
Fig. 4 is a cross-sectional view showing a structure of a conventional passive radiator, and Fig. 5
is a frequency characteristic diagram in the case where a spice radiator is mounted on a cabinet
together with a speaker unit.
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Reference Signs List 1 frame, 2 end, 3 damper, 4 diaphragm, 4a port. Name of Agent Attorney
Attorney 1 Takano and 1 other district Makoto 1)-NN + + へ 物 N Nmi Mi Zcw Mi Q Uri U U
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