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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electrodynamic speaker, FIG. 2 is a minor loop hysteresis characteristic of a magnet, FIG. 3, FIG. 4
and FIG. 5 are minor loop hysteresis of a magnetic body FIG. 6 is a cross-sectional view of the
speaker in which the minor loop hysteresis distortion of the magnet of the present invention is
improved, FIG. 7 is a connection diagram of FIG. 6, and FIG. Sound pressure frequency
characteristics and electrical impedance characteristics of the speaker before and after
implementation, Fig. 9 shows second harmonic distortion characteristics before and after
implementation of the same speaker, and Fig. 10 shows third harmonic distortion characteristics
as well . 1 и и и и и и и и и и и и и и 2 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и upper plate и i ......
circular ring-shaped magnet, 7 ...... lower plate, 8, 0, ... the center pole Mi 9-song voice coil, 10 ...
... magnetic gap, 11 ... ... Sword cap, 12 ... ... Aluminum short ring, 13 ... ... Detection coil, 14 ... ...
Other excitation coil. ] 1F
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a loudspeaker with
improved distortion to the minor loose hysteresis of a magnetic circuit. Loudspeakers are
required to achieve conversion from electrical system to acoustic string without distortion.
However, in the speaker a) distortion of the edge of the diaphragm or distortion of the support of
the support such as Dan / <-etc.) distortion of the vibration from the edge of the vibration и
distortion of the magnetic coil for voice coil Non-uniform strain of magnetic field 3 distributed in
the air gap-non-uniform ? f ? ?-j y 2 и ? divided strain of 9 swing plate or strain borne by
vibration ?) specific @ wave number In the support, such as the vibration of the diaphragm:
distortion due to frame or abnormal shaking WIJ) sound field distribution unrestrained-heat C
modulated modulation distortion 1) magnetic circuit 0 'iner z L' -7 There is a distortion or the
like that is based on the ""-"" "phenomenon. The present invention proposes a strained and totally
improved shear force which is based on the minor loop hysteresis phenomenon of a magnetic
circuit .quadrature. FIG. 1 shows an example of a conventional electrodynamic speaker, in which
an annular magnet 6 is provided on the outside and an upper plate 5, lower plate 1 and 7 and a
center pole 8 formed of electromagnetic soft iron. A magnetic circuit is formed, and one voice
coil 9 having the center pole 8 and the upper plate 5 and the magnetic gap 10 of .quadrature.
?? When the magnet 6 is thickened from the outside in order to add magnetism, the magnetic
flux density is shown by the magnetic f curve in FIG. Saturating company ?? ?? ? ?? ??
?? ?? ?? ?? ?? ?? ?? ?? ?? A A A ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?In order to achieve the sum of the
magnetomotive force to be spent and to get to the point C, it is possible to complete the magnetic
effect. When the current Isinwt is applied to the voice coil 9 of Nguyen N, the voice coil 9
vibrates and radiates a wave from the diaphragm 3 coupled with the voice coil Q in accordance
with the left-hand rule of 7 Remming-simultaneously with the voice coil 9 to 4M NI sin wt / A
magnetomotive force of 10 is generated to magnetize the center ball 8 disposed coaxially Q close
to the voice coil 9 and the 1ilfi next lower plate 7, the ring cedar red snapper, the upper
elongating plate 5 The magnetic flux enclosed degree of the ring magnet 6 is divided into a
period of Slnwt from point C to point E through point E to point D Magnetize between point E
and point D periodically. As for the operating point of Miki Toro, or the above-mentioned (? ??-? 2.
?? ? ?????????? The magnetic flux density of the magnetic air gap 10 for the
'7' 4 voice coil was changed to cause distortion. In order to reduce distortion based on the minor
loop hysteresis characteristics, as shown in FIG. 3, the center ball 8 is covered with a copper cap
11 to reduce the self-induced magnetizing force of the voice coil 9 to improve distortion. A
structure in which an aluminum short ring 12 is provided inside the center hole of the annular
ring magnet 6 as shown in FIG. 4 to weaken the self-induction of the voice coil 9 and reduce the
magnetizing force to improve distortion. As shown, a detection coil 13 is fixedly provided in the
vicinity of the voice coil 9 to detect a change in magnetic flux based on the hysteresis
characteristics of the magnetic substance close to the voice coil 9, eg, the center ball 8 or the
upper plate 5; The voltage induced in the detection coil 13 according to the change in the
magnetic flux of the magnetic substance and the 1 ? signal applied to the voice coil 9 are mixed
and canceled to make the magnetic substance And take the strain, given structure and whether
that particular reduce third crow harmonic distortion. In the present invention, the minor loop of
the annular magnet 6, 5) hysteresis characteristic based on the hysteresis characteristic is
reduced. More specifically, to excite the annular magnet 6 as shown in FIG. 6, the friz coil 14 is
provided on the outer periphery of the annular ring t Remagneto (fixedly provided as shown in
FIG. 7). 9 and the direction of the current of the other auxiliary coil 14 are the same in series
(connected). According to this configuration, the magnetizing force received from the voice coil 9
and the moving coil in the magnetro 1 is opposite in direction or direction, and cancel each other
out! ????? Therefore, the harmonic distortion characteristics, in particular, the second
harmonic distortion characteristics and the third harmonic distortion characteristics are
significantly improved at a frequency of 1 ░ of medium sound placement. Next, an embodiment
of the present invention will be described. 11. Enamell-coated copper wire of wire diameter 08 ?
is multiply coated 70 times around the outer periphery of ring-shaped 71 gnenot (size near 5?x
5 ? ? x 10 11) 6 of 20 cm cone electrodynamic speaker, ?, ?. ????????????
??????????? -0, 4XIQ'H, DC resistance! It is assumed that Re = 0.80 tear, selfdirection of voice coil 9 to j ? ? j 6 inductance ?Lvc? 0.08 XI 0-8 H, direct current resistance
Rvo-680. The connection between the separately excited coil 14 and the voice coil 9 is its
inductance when connected in series as shown in FIG. Since the phase of JI-vc and 14 which are
equal to 0.48 XIO-8H matches Lvce and the digit figure of two digits, the difference between the
coil 14 and the voice coil 9 is substantially different, I think there is no induction.
This means that the staring of the separately-excited coil 14 can be freely set to reduce the
distortion based on the minor lube-hysteresis characteristic of the magnet 6. The second
harmonic characteristics of the thus configured loudspeaker (after implementation) and the
conventional loudspeaker (implementation date 11) are shown in FIG. 9t (and the third harmonic
distortion characteristics in FIG. 10). It can be seen that the second high A-wave distortion and
the third harmonic distortion are significantly reduced at the frequency of the medium sound
tool. In the 0 conventional electrodynamic type loudspeaker, which describes the reason why the
above-mentioned harmonic distortion can be reduced, the magnetic flux 1 vc induced from the
voice coil 9 when the audio current isinwt flows coaxially with the voice coil 9 is disposed close
to the inner side. In the inside IS of the center ball 8 and the inside of the magnet 7, the inside of
the magnet 6, and the inside of the H side plate 5 flow sequentially through the inside IS of the
center ball 8 to form the inside closed loop leading to the magnetic air gap lO. During this time,
the magnetic flux generated from the voice coil 9 accompanied by the "magnetic loss due
to minor loop hysteresis" energy loss generally occurs in the annular magnet 6 as shown in FIG.
Therefore, assuming that the force F received by the voice coil 9 is 1, the length of the voice coil
copper wire is 1, and the cross-sectional area of the magnetic gap IO is ~, according to Fleming's
left-hand rule F = (? + + vc vcg) ? Isinwt / 10 / ? -------(Re-=!
???????????????? 'vcgllsinwt / 1? /
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии "" "Yk9 K M lb 7.,)" i "is changed according to g vc g of
(1) 2 ? acid of the second term according to the my No. 1 nar loop hysteresis characteristic of
the magnet 6-8 and harmonics not used for voice current It is in the prefecture where strain
occurs. According to the embodiment of the present invention, a magnetic flux ? induced from
the separately excited coil 14 when a voice current of 1 sinwt flows from the input terminal 15.
The magnetic closed circuit which flows on the outer periphery of the vehicle plate 5 and flows
around the outer circumference of the inner magnet 4 and upward extension of the mada net 6
and the play door and the 1 W coil 14 is formed. The magnetic flux ?? inside the annular
magnet 6 is parallel in the direction or opposite to the magnetic flux vc vc induced from the voice
coil 9 and the magnetic flux + induced from the separately excited coil 14 and is also parallel to
the DC flux ? m of the annular magnet 6 CC-? m-1-jvc-? e (2). (2) Formula v If the magnetic
force due to the separately excited coil +4 if this becomes -?, -O, all the minor loop hysteresis
characteristics of the ring magnet 6 are canceled <DIJ, then the magnetic flux ? 7o in the
magnetic air gap disappears (1) ' Is F = 'Pm1181ntvt / 10 / Ag- (3) and ? I + и force F in
proportion to current 1 sinwt is obtained. Harmonic distortion caused can be eliminated.
Also, since the separately excited coil 14 has no mutual lfg loss with the voice film 9 and is
connected in series, it acts as a low pass filter by the inductance of both coils I4.9. This is a
suitable function for low sound speakers. The inductance of the other +2 coil essential for
obtaining the crystallization frequency fc of the low-pass filter. ???????????????
???? Assuming that Le "= Ze / 2 wide fc, the inductance of the separately excited coil 14
obtains about 17 of the magnetic permeability from the adjacent magnetic body and is I / (1, 7 or
4077 times the number of times of the idle coil). The amount of copper wax is saved, which has
the effect of lowering the manufacturing cost as well.
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