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JPS57103497

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DESCRIPTION JPS57103497
Description 1, title of the invention
スピーカ
3. Detailed Description of the Invention The present invention seeks to provide a loudspeaker
that can optionally select the lowest resonant frequency by electrically tuning compliance to
determine the lowest resonant circuit. In general, the speaker was configured as shown in FIG.
That is, the frame 6 is coupled to the magnetic circuit 5 constituted by the plate 2 having the
center pole 1, the ring-shaped magnet 3 and the ring-shaped upper plate 4 and the diaphragm 7
together with the gasket 7 ' The peripheral edge of the edge 9 of 8 is joined by bonding etc., and
the residual coil 1 o is joined to the central part of the diaphragm 8, and the middle part of the
voice coil 1 o is held by the damper 11 to lower the voice coil 1 o And the dust cap 13 attached
to the central upper surface of the diaphragm 8. The lowest resonance frequency f of the speaker
of such a configuration. As is apparent from the mechanical system equivalent circuit shown in
FIG. 2, it was determined by the vibration system mass Mm and the vibration system compliance
Cm. That is, it was decided by. In FIG. 2, RM indicates the equivalent mechanical resistance, and F
indicates the input. When this speaker is assembled in a closed box, the mechanical equivalent
circuit shown in FIG. 3 is obtained, the compliance Cc of the closed box is in series, and the
lowest resonance frequency fO as the speaker box is EndPage: 1. The lowest resonance frequency
fo rises. As described above, the lowest resonance frequency as the speaker is constant, and there
is a problem that when selecting the lowest resonance frequency as the speaker system, it is
necessary to change the size of the box or the like. The present invention solves the abovementioned conventional problems, and an object of the present invention is to provide a speaker
in which the lowest resonance frequency can be arbitrarily adjusted by the speaker itself. An
embodiment of the present invention will be described below with reference to FIGS. The
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configuration of the speaker is substantially the same as that shown in FIG. 1, and only the voice
coil 1o will be described here because it has features. First of all, in FIG. 4, the voice coil 1o has
the voice signal winding 16 around the lower periphery of the cylindrical bobbin 14 and the
winding direction is reversed at the center of the winding width on the voice signal winding 16
The auxiliary winding 16.17 is wound, and the lead wire 18 is drawn from the voice signal
winding: 16 and the lead wire 19 is drawn from the auxiliary winding 16, 1.7. The state when a
current i is supplied to the auxiliary winding 16 ° 17 of such a voice coil 1o is shown in FIGS.
6A to 6C.
In FIG. 5, the voice signal winding 15 is omitted. In FIG. 5, AA 'shows the center line of the
magnetic gap 12, Fu is a force acting upward when a current i flows, Fd is a force acting
downward, and B is the magnetic flux of the magnetic gap 12. Density, i! , L is the in-pole line
length of the winding portion where current flows in the direction indicated by ▪, LH is the inpole line length of the winding portion where current flows in the direction indicated by ■, L is
the auxiliary winding 16.17 The boundary line, x, indicates the displacement of the boundary
line. FIG. 6A shows that the center line of the magnetic gap 12 and the boundary line t coincide
with each other. Fu = BI) -L1. Fd, -BI! , H, f) and L = IIH, Fu = Fd, and no force acts on the voice
coil 1o. In FIG. 5B, the voice coil 1o is displaced upward by X, and since nL> 214, it becomes Fu)
Fd, and a force proportional to the displacement X is applied upward to voice filter 1'0. In FIG.
5C, the voice coil 1o is displaced downward X, and since βL <LH, Fu <Fd, and a force
proportional to the displacement X is applied downward to the voice coil 1o. This is considered
negative compliance if substituted from the definition of compliance. When the direction of the
current i is reversed in FIG. 6, forces proportional to the displacement X are applied in the
direction opposite to the displacement direction, which can be regarded as positive compliance.
FIG. 6 shows a mechanical equivalent circuit of the speaker of the present invention. Cx in FIG. 6
is the compliance caused by supplying a constant current 1 to the auxiliary winding 16.17
described in FIG. 5, and the lowest resonance frequency fo of this speaker is obtained. As
described above, the lowest resonance frequency fo of the speaker can be freely controlled by
the direction and the magnitude of the current i flowing through the auxiliary auxiliary winding
16.17, and the low frequency characteristic can be changed. In addition, when the speaker is put
in the closed box, the minimum resonance frequency is increased by the compliance Cc of the
closed box, but if the CxO value of the speaker of the present invention is selected negative, the
compliance of the closed box can be compliance with the compliance CC7 of the closed box. As
Cc is canceled, the lowest resonance frequency does not rise, and the lower limit frequency
EndPage: 2 number is extended. As described above, by providing the auxiliary winding in the
voice coil of the speaker according to the present invention, the minimum resonance frequency
can be arbitrarily controlled depending on the direction and the magnitude of the current flowing
to the auxiliary winding. It also makes it possible to control characteristics and become a dog of
industrial value.
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4. Brief description of the drawings. FIG. 1 is a half sectional view of a general speaker, FIG. 2 is a
mechanical equivalent circuit diagram of a conventional speaker, and FIG. 3 is a machine when
the same speaker is incorporated in a closed box. Equivalent circuit diagram, FIG. 4 is a half
sectional front view of a voice coil in an embodiment of the speaker according to the present
invention, FIG. C is an operation explanatory view of the voice coil in the same speaker, and FIG.
6 is a mechanical equivalent circuit diagram of the same speaker. 6
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············································································ − Fig.2 Fig.3 Fig.4 kS5 Fig.6 sixth factor EndPage: 3
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