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BRIEF DESCRIPTION OF THE DRAWINGS The first factor is a diagram showing a conventional
passive radiator, FIG. 2 is a diagram showing a passive radiator and a speaker unit
(electrodynamic speaker) attached to a cabinet, and FIG. 3 is the present invention 4 is a crosssectional view taken along the line AA 'in FIG. 3, FIG. 4 is a diagram showing the characteristic
change due to the change of the resonant frequency of the conventional passive radiator
(constant compliance), FIG. FIG. 7 is a perspective view of a winding mechanism member of the
present invention, showing characteristics change due to a change of a resonance frequency of
the passive radiator (constant mass) of the invention. 1 ... diaphragm, 7 ... speaker unit ([type
speaker), 9 ... projection, 11a, 1 lb, 11 c. lid: winding mechanism member, 13a, 13b: elastic body.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a passive radiator
that can continuously change the compliance of the passive radiator support system. The passive
radiator 6 is a device for expanding the efficiency of the low-range reproduction band by
resonating the vibration system of the passive radiator 6 using the sound pressure generated
inside the cabinet 8. Therefore, the performance of the passive radiator 6 is influenced by the
factor causing the resonance, that is, the vibration system mass and the compliance of the
vibration support system. す71u・S! +, /? The conventional passive radiator 6 has the edge
2 formed on the outer side of the & moving plate fixed to the frame 5 as shown in FIG. The
center support river damper 3 is installed. A screw is provided at the central portion of the
shaker plate, and the effective type set can be changed according to the number (additional
weight) 4 of nuts engaged with the screw. In the structure of the above-mentioned Pansi bragita
6, since the compliance of the wound support system can not be changed, the vibrating yarn
quality is changed by changing the degree of the weight of the additional weight 40 by the
above-mentioned means. Changed the characteristics of the The characteristic change due to the
change of the co- and ceramic wave number of the panci bragita when the compliance is constant
and the mass is changed as in the conventional pan-si bragita becomes as shown in FIG. Each
constant is a trace shown below. The constant of speaker (electrodynamic type speaker) 7 is cone
effective radius 107 an + equivalent W company 43 g, lowest resonance frequency J 911 z +
poise fill DC resistance 48 (Ω), force system & (H−1) 9 (φ−m), 210. (,)) The passive radiator 6
constant is a cone effective radius of 15.7 cm equivalent mass 155 g, a resonance frequency of
21 (Hz), and a cabinet volume of 0.1 m ". The passive radiator resonance fp (port resonance in
the bass reflex) at this time is J51-1z. Fig. 5 is a graph in which the sound pressure
characteristics (SPL) and the vibration characteristics (ξ) are theoretically obtained by changing
the mass of one curve of the passive radiator so that fp becomes 29 Hz and 41 Hz under the
above conditions. is there. As apparent from FIG. 5, it is not possible to desire the real output
with high sensitivity in the ultra low frequency band outside the reproduction band, and the
sound pressure level when the resonant frequency of the passive radiator is exceeded or lowered.
(SPL) has a drawback that a considerably large peak dip occurs.
In addition, it is difficult to obtain the best characteristics because the quality of the passive
radiator can not be changed continuously. The present invention solves these drawbacks, and
provides a passive radiator that provides optimum acoustic performance by continuously
changing the compliance of the vibration support system. An embodiment of the present
invention is shown in FIG. 3, FIG. 4 and FIG. FIG. 3 is a rear view of a passive radiator having a
rectangular flat directional diaphragm, FIG. 4 is a view showing a hA 'cross section of FIG. 3, and
FIG. 7 is a perspective view 1 of a winding mechanism member. It is. The same reference
numerals are given to the same members in FIG. 3, FIG. 4 and FIG. The diaphragm is fixed to the
outer frame 5 of 7 frames via the edge 2 and a square projection 9 is formed on the back of the
diaphragm l. The protrusions 9 are formed such that the apexes of the protrusions 9 face the
direction of the midpoint of each side of the diaphragm, and the pores 16a, 16b and 16c are
traced to the midpoint of each side of the protrusion 9 , 16d are formed. In the pores, the
opposing pores 16a and 16C, and J6b and J6d are formed equidistant from the diaphragm.
Further, the frame is a support member 10a, lOb, lOc, diagonally formed at an intermediate point
of two sides adjacent to each other from the intermediate point of the outer frame member 5 for
fixing the edge 2 to the inner side and the intermediate point of each side of the outer frame
member 5. It consists of IOd. The outer frame member kJ4> member 5 has a square shape, and
an opening is formed therein so that the diaphragm plate can be attached, and a screw hole 14 is
formed to be fixed to the cabinet 8. Further, protrusions 12a, 12b, 12c, 12d are provided in the
direction of the top of the outer frame 5 at the middle points of the support members 10a, 10b,
10c, 10d, and the protrusions 12a, 12b, 12c, 12d are provided. Winding mechanism members
11a, 11b, 11c and 11d are installed. Pores 15a, 75b, 15c, 15d opposed to the pores 16a, 16b,
16c, 16d formed in the protrusion 9 are formed at the middle points of the support members
10a, 10b, 10c, 10d, respectively. ing. Also, an elastic body such as rubber from the winding
mechanism member 11a. A coil spring, through an aperture 16a + 16c of the support member
10a and the aperture 16a + 16c of the projection 9 to the opposing winding mechanism member
11c to the coiling member 11c having elasticity, and finally through the aperture 15c of the
support portion 10c It is tied to 11c. Similarly, one elastic body is a pore 15d between the
winding mechanism member 11d and the winding mechanism member 11b.
It is connected via 16d, 16b and 15b. The winding mechanism members 11a, Ilb, lc, 11d are
protruding portions 1 + J-4! Solidify with p12a, 12b, 12c, 12d with a screw, and take-up member
11a. 11b, 11c * Ild by rotating the elastic body 3a around the outer periphery of the winding m
lateral members 11a, 11b, Hc, 11d. The elastic bodies JJa and 13b (D tension is changed by the
winding operation so as to wind 13b. The diaphragm 1 of the passive radiator has the pores 16a,
16b 16c, 16d of the projection 9 and the pores 15a of the support member 10a, 10b, 10c, 10d.
Since the elastic bodies 13a and 13b between 5b, 15c and 156 are forced, tension of the elastic
bodies 13a and 13b can change the compliance of the vibrating yarn. The diaphragm of the
present invention is not limited to the planar diaphragm. Also, instead of using one elastic bar in
the two winding FM structure members as in the present invention, it may be used for each
winding mechanism member, or an elastic body may be fixed to the surface of the projection. . To the protrusion. Even if the winding mechanism member is formed on the front surface of the
diaphragm 1 and the tension of the elastic body retained or fixed on the projection is changed,
the resonance frequency of the passive radiator according to the present invention can be
changed The characteristic change due to is shown in FIG. Outside go · · · 6 Nino-1 ltl. The
conditions such as the speaker (electrodynamic speaker) constant, the passive radiator constant,
and the cabinet volume are the same as in the case of FIG. 5, and the compliance is adjusted so
that fp is 29 Hz and 4 square 2 First, the material characteristic (SPL) and the amplitude
characteristic (ξ) are obtained. As shown in FIG. 6, the relationship between FOp and ξ is
reversed from that in FIG. 5 in the ultra-low range outside the Yayoi zone and in the re-rest, so
high sensitivity and high output are desired it can. In addition, even when the resonance period
of the passive radiator is increased or decreased, a large peak dip does not occur in the material
level. According to the present invention, since the compliance can be changed continuously,
desired characteristics can be obtained. Of course, by adding the means for changing the
constant of the present invention to the conventional mass-variable passive radiator, it is possible
to obtain more optimum characteristics.
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description, jps5798096
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