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JPS55100391

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DESCRIPTION JPS55100391
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a conventional
speaker magnetic circuit, FIG. 2 is a magnetic equivalent circuit showing one embodiment of a
speaker magnetic circuit according to the present invention, and FIG. FIG. 4 is a diagram showing
the adjustment state of the magnetic flux distribution of each magnetic air gap in the above
embodiment. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· + yoke, 4 · · · · · · · Resistor, 5 · · · · · · High magnetic conductivity, G, ', G 2' · · · · · · · · · · · · · · · · · · · · · ·
2 2gltg2 "· · ·" amount of magnetic flux, R 1, R 2 · r · · · · · · · · resistance.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a speaker magnetic emergency circuit which shoulders a plurality of magnetic gaps with
respect to a single magnetic source in a speaker magnetic circuit. For example, as shown in FIG.
1, there are a magnetic circuit for a composite type speaker which is wound from a magnet 1, a
pole piece 2 and a yoke 3 as the conventional magnetic circuit for a speaker. In this case, the
magnetic flux distribution of the magnetic gaps Gt 7 and G 2 is previously determined (1), 2/7;
and can not be adjusted, and even if the magnetic flux of both magnetic gaps G 1 and G 2 is
equal. Since the magnetic flux passing area of the magnetic gap G1 located in the large diameter
portion is larger, the magnetic flux density of the magnetic gap G1 or the magnetic flux gap 磁 of
the magnetic gap G2 is l "· · · As a result, the composite speaker There is a problem that it is
difficult to obtain a magnetic flux distribution, which is difficult to install. In view of the above
problems, the present invention provides a speaker magnetic circuit in which the distribution of
each magnetic flux amount of the magnetic gap can be adjusted without loss by arranging the
magnetic luster resistor at a predetermined value. The embodiment of the present invention will
be described based on FIG. 2 to FIG. The same parts as those of the conventional example are
denoted by the same reference numerals and the description thereof will be omitted. The
reference numeral 4 denotes a magnetic resistance resistor suspended in the high conductivity
magnetic substance 5, and as shown in FIG. 2, a magnetic flux circuit formed by the macnet 1,
02-05-2019
1
the + side yoke 3 'and the lower side yoke 3 as shown in FIG. The magnetic gap G and / or ball
21 located between the lower yoke 3 and the lower yoke 3 are disposed between the lower yoke
3 and the lower yoke 3. Connect f2 +. The magnetoresistance of the magnetic resistor 4 is
appropriately selected according to its thickness and thickness, and the distribution of the
magnetic flux of the magnetic gaps G1 'and 02' is selected by the selection of the magnetic
resistance. It's going to be adjusted. In order to explain the adjustment of the magnetic flux
powder cloth, replacing the logic C magnetic circuit with a magnetic equivalent circuit, the
magnetic resistance of the individual yokes 3 and 3 'is a magnetic gap (1, 7 N, G, Compared with
the magnetic resistance of 1 and the magnetic resistance of the magnetic resistor 4, it is omitted
because it is I ". Therefore, it is eventually replaced by the magnetic side circuit as shown in FIG.
However, stool is the magnetic flux of Macnet 1, gl is the air gap (3, * flux of magnetic flux * mg2
is the magnetic flux i of magnetic air gap G2 ', R + is the magnetic air gap 6, / magnetic
resistance of R, R2 is the magnetic resistance The magnetic resistance of the magnetic gap G, /, r
is the magnetic resistance of the magnetic resistor 4. Now, in this magnetic equivalent circuit, if
r-0, then g · · ·, g, = Q · · · · · · · · (111.
Also, assuming r-knowledge, gl-g2 = j mountain ... (2) R1 + R. (3)! み: となる。 Further,
the change of gl and gl at 1 r = O to ■ is graphically shown as shown in FIG. Therefore, as is
apparent from FIG. 4, when the value of the magnetic resistance r of the magnetic resistor 4 is
selected, for example, roK, the magnetic flux amounts of the magnetic gap G, / and G, / are
respectively 1210 and g20. It becomes. Thus, it is possible to adjust the magnetic flux
[distribution of the magnetic air gaps G, / and G, / / by appropriately selecting the magnetic
resistance r of the magnetic resistor 4. Also, since this adjustment is performed as changing the
ratio of distribution of a fixed amount of magnetic flux to each magnetic gap, there is no loss
from the total amount of magnetic flux. In the case of the example shown in the case of Tohisumi,
two magnetic air gaps are provided, but a plurality of G'V's of magnetic spaces @ are provided,
and a plurality of pole pieces located in each magnetic air gap are provided. It goes without
saying that a magnetoresistive resistor may be disposed. As described above, the speaker
magnetic circuit according to the present invention is convenient because it can adjust the
distribution of the amount of magnetic flux of each magnetic gap without loss. In particular,
when this magnetizing circuit is used for a magnetizing circuit such as a composite type slider,
(4) = 9 the required bandwidth KC of each diaphragm or the like can be supplied arbitrarily, so
that the amount of magnetic flux required can be supplied. It exerts an extremely heavy effect
that the adjustment of sound output level and sound quality is the key.
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