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DESCRIPTION JPS5967798

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DESCRIPTION JPS5967798
[0001]
This invention! , Detect the change in magnetic flux in the magnetic field in which the voice ll Tlil is placed. As shown in FIG. 7, the basic structure of the dynamic speaker is to integrally connect
the ring-shaped magnetic [1] and the lens pole 2 disposed at the center thereof with one body iEl- 3C at the bottom, A top yoke 4 is fixed on the top side of the magnet 1], a tip 17 is formed
between the tab yoke 4 and the lens ball 2, and a voice coil 6 is disposed in the gap 5. ing. Here,
assuming that the magnetic flux density of the magnetic flux passing through the side surface of
the voice coil 6 among the magnetic flux generated from the magnet 1 is B (Wb / m 2), the value
of the driving force F acting on the voice coil 6 is F It is represented by = B-L.I (N). However,
when current flows in the voice coil 6, a new magnetic flux is generated from the voice coil itself
as shown in FIG. 2 and passes through the lenser ball 2. The magnetic flux in the center ball 2 is
changed. For this reason, there is a problem that the magnetic flux density B penetrating the
circumferential side of the voice coil, which is directly related to the driving force of the voice coil
6, changes, and the driving force does not become linear with the low eye current I. In addition,
since the magnetic flux density in the magnetic gap 5 is not uniform along the gap 5, when the
voice coil moves along the gap 5, the moving density at each moving position (flux density e, B
related to the voice coil also changes) This is also a factor that overdrives the driving force. The
present invention has been made in view of the above problems, and therefore, it is necessary to
set an electro-acoustic transducer having the right linearity between the voice coil current l and
the voice coil driving force]. One pair (It IJ-to be. In order to achieve the above object [1, 1], in
order to achieve the above-mentioned purpose, a magnetic flux interlinking U1 through a side of
the voice coil is attached to the voice coil, and a detection coil is attached to the voice coil. The
change of the magnetic flux directly related to the drive of the voice coil is set to 3?, and the
negative feedback is applied to the magnetic flux and the current based on this detection signal,
and the complement of 11 r of r linearity is added. In the following, a preferred embodiment of
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the present invention will be added (= J in detail based on the drawings). The receiving force of
the current flowing in the ?m field is the direction of the magnetic flux density 13, the direction
of the current 1, and the direction of the force [one direction of U] respectively, and in the case of
the voice coil, the third The relationship is as shown in the figure. That is, the current I flows
circularly along the voice coil, the magnetic flux density B flows radially from the inside of the
coil to the outside (or from the outside to the inside), and the direction of the generated force 1-is
up and down in FIG. It becomes a direction.
Although the direction of the magnetic flux density B is not necessarily perpendicular to the
voice coil due to the characteristics of the yoke and ball, etc., the vibration direction of the voice
coil is limited to the vertical direction in the figure. The magnetic flux related to the force can be
regarded as a projected magnetic flux to a plane orthogonal to the direction of the drive line JF in
the figure. Also, assuming that the voice coil is wound at a uniform density over the entire length,
all of the voice coil having a constant magnetic flux density B at the rib portion of the voice coil
may not penetrate all the side surface of the voice coil If the magnetic flux ? is equal, the driving
force can be considered to be equal 4 as well. Therefore, if it was possible to detect the magnetic
flux orthogonal to the voice coil circumferential side, it was concluded that this would be the
distribution of the magnetic flux related to the driving force of the voice coil. Next, the form of
the detection coil will be described. When the X-ray beam of FIG. 3 is cut and stretched, the voice
1-yl becomes a rectangular shape J in FIG. In other words, as indicated by the dotted line along
the perimeter of this rectangle, 7 coils of detection coil can detect the change of total magnetic
flux (1) that passes 111 through the circumferential side of voice- 'yl vertically. . Concretely L, Wi
71 Fig. 71 'X + X + liQ X 2 If the X 2 wire is joined as it is, the detection coil 7 will be wound as
shown in FIG. As shown in FIG. 6, the voice coil 6 may be t9 NI or U. Next, a method of obtaining
the magnetic flux from the output of the detection coil will be described. When the coil C detects
a magnetic flux, the time change of the magnetic flux is detected as a voltage. Therefore, to
detect a signal corresponding to the magnetic flux density 11q, the detection output is integrated
between It and '1. You must do it. That is, when the output of the detection coil is changed to C1,
the entire circumferential area of the coil is changed to S, and the total magnetic flux ? is ?8-8
[3 (2), (1), (1 From the equation (2), it can be seen that the amount of change in magnetic flux
can be determined by integrating the detection output e1 if the amount of change in magnetic
flux density B is determined based on ?B. Figure 7 specifically uses the above equation!
Integration circuit, which does not meet the requirements. Therefore, if equation (1), which is the
output of the detection coil, is input to this circuit, then J3, the dotted line C shown in the figure,
one resistance 1 <' Resistance. Next, a method of compensating for the non-linearity of the
driving force with respect to the human body signal by using the above detection two coils will
be described. As described above, the driving force [: is represented by [3 1-1 l, but since the coil
length [-is constant, it is to be corrected that the flux density] 3 is nonlinear. Two methods are
conceivable.
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One is a method J in which the magnetic flux density B becomes one constant J, and the other is
a method C of providing feedback to the magnetic flux itself by using the output tine of the
integrator, and the other one results in 13 и 1. The variation of the magnetic flux density 13 when
1 becomes linear is corrected by controlling the current l. In order to change the magnetic flux
density B in the magnetic circuit, it is necessary to switch the auxiliary coil 8 as shown in FIG.
The signal source 9 is obtained by the A-di A No. No., amplified by the amplifier 1 o and then fed
to the voice ?I? 6 and wound around the lens ball 2 via the lateral movement amplifier 12 Is
supplied to the auxiliary coil 8. The flux generated from the auxiliary coil 8 (0 bundle and the
magnetic flux generated from the voice coil 6 are in the opposite direction, whereby the magnetic
flux generated from the voice coil 6 is subjected to negative feedback control. Also, the
integration band of the integrator 11 needs to be sufficiently wider than the frequency band of
the music signal, but there is no need to integrate V up to the DC component. Next, to explain the
operation, while there is an input signal as shown in FIG. 9, the magnetic flux density B of a
normal speaker fluctuates as shown in FIG. 10, whereby the driving force F becomes as shown in
FIG. In contrast to the strain / v, according to the present invention, since the magnetic flux
density B is always kept constant as shown in FIG. 12, such distortion is eliminated as shown in
FIG. Is held []. Next, a method of controlling the input signal to linearize the driving force will be
described. In this method, the fluctuation of the magnetic flux density B is dealt with by
controlling the input signal to the speaker. The electric circuit (2 J, 1 person using a divider),
since the drive 1 FIJ [the value of 13.1 and the product of the respective values is as shown in
Table 4. (L: uj (21 minutes Output a signal from the device and form a signal divided by C> (]),
drive the speaker with this signal, and the fluctuation of one magnetic flux valley degree B affects
the driving noise! ???????????????? As shown in Fig. 1/1 in Fig. 1/1, when the
first symmetrical <Z (+4 bow v1 is applied, the output waveform of the integrator 11 is as shown
in Fig. 15). Will be 1q. Here, the integrator 11 considers the problem of the drift 1 to snow 'C' D
Cfi! 1) 'C, so that the integrator '11 provides an output corresponding to only the fluctuation of
the magnetic flux, and the steady-state magnetism! The component of ?I I, i 5 -4 is not 111 to
1III (DC magnetic field) 1 ░ next, the output of the integrator 11 is added to the steady-state
magnetic field C by the integrator 13 l) G voltage V13 is added The decimated L5 is input to the
divider.
The lfi of this heating result is directly related to the driving force of the voice coil. : It is
proportional to magnetic flux density 1 good 1 ?, and expressed as k 13 (k is a proportionality
factor) below. Next, the divider 14 performs an operation of ? on Uni, and the result of this
deduction is output as v2. Next, the output v2 of the divider 14 is amplified by A by the power
amplifier 15 to become A-v2 and becomes a drive signal for the voice coil 6. Here, although the
impedance of the voice coil 6 is 7, the current I flowing through the voice coil is as follows. Also,
the value of the output v2 of the divider 14 is: Since the driving force of the voice 1-yl is [3 и и и и I
1 ': = 11 и 1 и и и и и (10) becomes (10), the equation (9) is substituted into the equation (7) It is
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revealed that the magnetic flux density E3 is R'l so that the influence of the fluctuation of the
magnetic flux density B disappears. In the above embodiment, the present invention is applied to
a dynamic speaker, and an electric sound and spine change IIA unit that converts electric straw
electric input into sound output, but instead, the sound input of microphone IJ, fan, etc. The
present invention is equally applicable to the 711 noise-to-noise converter that transforms into
an electrical output. As is apparent from the above description of the embodiment, the present
invention relates to an electromagnetic type electric sound tube converter having an extremely
accurate linearity between J, a voice coil current r and a voice coil driving J force. It can be
provided 1-.
[0002]
Brief description of the drawings
[0003]
Fig. 1 is a poly sectional view of the conventional structure of a dynamic speaker, Fig. 2 is a
schematic view without showing the magnetic flux generated in the voice coil by signal current
1-a schematic diagram, Fig. 3 is the direction of magnetic flux density B in the voice coil,
Direction.
1 is a schematic view showing the direction of the force F, FIG. 4 is a drawing showing a state in
which the voice coil of FIG. 3 is cut by x-ray and stretched, and FIG. 5 is a drawing showing the
form of detection coil Fig. 6 is a perspective view showing how a detection coil is mounted on a
voice-I-I coil. Fig. 7 is an electric circuit diagram showing the configuration of an integrating
circuit for obtaining a magnetic flux from the output of the detection coil. Fig. 8 shows the
structure of Dynamics Peats J that feedbacks the fluctuation of the magnetic flux J to the main
magnetic flux to compensate the non-linearity by utilizing the present invention, Fig. 9 shows the
structure of Fig. 9 A waveform diagram showing an input signal, FIG. 10 is a waveform diagram
showing a magnetic flux fluctuated by the influence of the input signal, and FIG. 11 is a
waveform diagram showing a driving force of distortion / V due to the fluctuation of the
magnetic flux, 12 is a waveform diagram showing the state of the magnetic flux corrected by the
auxiliary coil, and FIG. 13 shows the auxiliary coil. Fig. 1 / I is a waveform diagram showing that
the driving force is symmetrical when the CC11 bundle is corrected, Fig. 1 / I shows that the
present invention is used to control the C power signal and linearize the driving force. 14 shows
the circuit structure of the dynamic speaker as shown in FIG. 1, FIG. 15 shows the output
waveform of the stacker 1), FIG. 16 shows the waveform diagram of FIG. The component
corresponding to / 11 is m-folded, and it is a waveform diagram for receiving an I? state. 1 иии
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Ring-shaped net 2 иии Lenter ball 3 и и и Bottom 1 и и и и и и 1 1 Tsubu Cork 5 и и и и и и и и и и и и и и и и и и и и и и
"detection 1" r 1, r 1 applicant made of this musical instrument 36 Inc. Figure 1 Figure 4 Figure
5 Figure 6
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