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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are sectional views showing an
example of a conventional magnetic circuit, and FIG. 3 is a sectional view showing a magnetic
circuit according to the present invention. 11 ииииии Annular magnet, 11a 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 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 pole yoke, 12a и и и и и и и и и и и и и и и и и и и и и и
center pole 12c и и и и и и и и и и и и и и и и и и и и и top plate.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an external
magnet type magnetic circuit of an electrodynamic 4-speaker. Generally, as shown in FIG. 1, the
external magnet type magnetic circuit comprises a thread-like magnet, a back plate 2 joined to
the lower layer 1 of the annular magnet 1, and the center of the ring from the center of the back
plate 1). The magnetic yoke mG is formed between the pole yoke 2 composed of the center pole
2b assembled in the hole 1 of the magnet 1 and the upper four surfaces of the annular magnet 1
to form a magnetic space mG between the pole yoke 2 and the center pole 2b. The cover plate 3
and the cover plate K are used. And in order to position the magnet 1 relative to the back plate 2
& at the time of assembling the magnetic circuit, the back plate 2 turtle has about 05 to 10
islands on the side where the magnet 1 is installed, and the outer diameter is a magnet An
annular projection 2C leading to the inner diameter of 1 is made to project to form a positioning
abutment, or the thickness of the back plate 21L is substantially equal from the base of the
center pole 2b to the outer periphery & . However, using a back plate of such uniform thickness
is wasteful from the point of view of materials for materials. This is because of the general nature
of the magnetic flux, the cross section of the back plate at a diameter larger than the diameter of
the center of the pine pole at the center pole is the area of the above root and the area of the
base Since the magnetic characteristics of the circuit 5 do not deteriorate, it is because the outer
peripheral portion of the pack plate becomes thicker than necessary if the & plate thickness of
the back plate is uniform to the outer peripheral edge. Therefore, in order to eliminate such
waste of material, it is thought that the thickness of the plate should be reduced as it gets closer
to the outer periphery by attaching a taber 2d to the back of the backbrae 2a as shown in FIG.
However, with this type of construction, the 1 ? -i1 ? of the speaker assembly becomes worse,
and again there is a problem that it is impossible to attach the 4 yen label such as the name of
the speaker to the pack plate 2 & 's remarks. This review was made in the light of the abovementioned point, and the place where it is made is the first vision of the material without
complicating the process of assembling the speaker and attaching the marking label. External
Magnet with Back Plate for One! -To provide an optical / damper type magnetic circuit.
Hereinafter, an embodiment of the present invention will be described with reference to FIG. The
magnetic circuit according to the present invention comprises an annular magnet 11, a back
plate 121L joined to the lower end surface of the annular magnet 11, and a back plate like the
conventional magnetic circuit shown in FIG. 1 and FIG. A pole yoke 12 consisting of a setter pole
12 b standing in the hole 11 & of the annular magnet from the center of 12 m, as above,!
A top plate 13 is formed on the upper end surface of the jt ? magnet 11 to form a magnetic gap
G with the upper jC center ball 12b. The pressure on the magnet mounting surface side of the
back plate 12 & is formed with a step 12 o in which the inner diameter portion of the magnet 11
is fitted, so that positioning of the magnet 11 with respect to the back plate 12 is performed. The
step 120 for positioning the magnet is different from that shown in FIG. 1 and FIG. 2 in that the
thickness of the back plate 12m from the position corresponding to the inner diameter of the
magnet 11 to the outer periphery k is the root portion of the center pole The magnet installation
1IIl of the back plate 121L (partially cut from the position corresponding to the inner diameter of
the i-magnet 11 to the outer peripheral edge so that it becomes smaller than the thickness of the
back flat 12 ? from the position to the position corresponding to the inner diameter It is formed
by Now, assuming that the plate thickness of the backgrate 12 & from the center pole 12bO root
to the step 120 is h1, and the outer diameter of the root of the center pole 12b is Dp1 step
diameter ? 12o, the diameter is Dmg. The thickness h2 of the back preni) 121L up to the
peripheral edge is h25 "? Xh, It is defined by the formula il + ig. If the thickness of the back
plate 12 & is not the characteristic ft of the magnetic circuit, even if the thickness h 2 of the back
plate 12 & is thin so as to satisfy the above equation, the characteristics of the magnetic circuit
are limited. There is no contradiction of the influence of This is determined by the equation (1)
obtained as follows. Now, the disconnection of the back plate 12 & at the root of the center pole
12b 1. Assuming that the cross-sectional area of the back plate 12 & at the diameter DBH of the
difference 12o between IIl and Sp1 is Smg, Sp and S theory gFi can be expressed as follows.
Police Sp = ? Dpt, ... (2) S ? g = ? D @ gt, ... (3) As described above, the magnetic l! ! Since it
may be 8p # S1Bg in the circuit, it may be ?Dpi, # ?Digtt-t41 from Formulas (2) and (3), Dt21Upt1 ... il + mp from this person (4) can get. In order to determine the thickness t of the back
plate 12 &, the method of using the equation (5) such as tl ? 4 ии (5) with Dp as the outer
diameter of the center ball 12b was used, but using this equation The required thickness t of the
bank plate 12 & is not necessarily optimum for the performance of the actual magnetic circuit,
but rather it is excessive thickness and the cost is still limited due to the manufacturing method It
is a factor such as manufacturing difficulty.
Therefore, the applicant of the present application has first made 1- (Do2-D 2), pT-.SIGMA. (6) '1)
It was possible to determine the thickness of backgrate 12 & so as not to be too short by TDpBy
(2). Here, Dp is the inner diameter and outer diameter of the base pole 12b at the root (b), Di and
Dog magnet 11 @, (m) is the saturation flux of the back plate 12 & @ (gauss) B, magnet 110 The
approximate flux @gauss (Gauss) obtained from the operating point of the demagnetized forest,
PT is the total permeance of the magnetic circuit, and pipi is the sum of 1 leakage permeance of
the magnetic circuit. Now, for example, a magnetic circuit of Dp = 48, an air gap length of 12%,
and a counter width of 8 m +, D ? = 120 ++ g, D processing = 60 О 17 mm, 1 gne ? of steel
Since p7 = f83, ?p-ero 2 and B, 1 = aooo gaussian, By = 14000 gauss, equation (6) force и t = S
fog is obtained. This sky-flux flux at this time is 10000 Gax when measured, but this ridge is the
one of a royal system specification of the Yamaki circuit constructed using the back plate of the
thickness 12 + 11 ++; It hardly changes. As mentioned above, the thickness t1 of 12 m can take
the value of the gods by the method of adding it, or the present thickness is based on the
thickness t, which is regarded as optimum, based on the formula il + Let's take a thick t, and
make it 0,. As described above, the thickness t of the back plate is added to ??? Since a step
equivalent to the height is formed on the side of the puck plate on which the plate is mounted, it
is possible to save material on the puncture plate, and it is easy to position the magnet of
assembly ?, and for car stereos and door mounts. In addition to making it possible to make the
speaker thinner, it is easy to attach the speaker markings.
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jps5794299, description
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