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DESCRIPTION JPS5291033

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DESCRIPTION JPS5291033
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 are auxiliary views of a magnetic circuit
used in the prior art, FIG. 4 is a sectional quotient of the magnetic circuit of the present
invention, and FIG. 5 is an oblique view showing an example of the lower magnetic pole of the
present invention. An eyelid view. 5 · · · diaphragm, 6 is a voice coil. $ 1 Fig. 2-135-Actual
opening 52-91033 (2) Fig. 5-136-
Detailed description of the invention: The fourth business relates to a working circuit using an
annular cylindrical magnet i [non-electroacoustic transducer I @ a1 stone circuit, and in this case,
it is approximately the same as the field magnet 5 / l-central magnet Ii2. Concentric K11i! As
shown in FIG. 1, for example, as shown in FIG. 1, it may be inserted into a nonmagnetic
positioning grinder 71 in the form of central magnet mλ and 1 曽 -shaped stellar / l) mK'll, or as
shown in FIG. In the circular step mtvt, the scratch is almost equalized to the inner diameter of
the ring-shaped magnet l and positioning is carried out in the same manner as in the upper
magnetic 1i4c as shown in FIG. 1 or s3. A method was adopted in which the upper and lower
ceramic W4c · 3 were to have the same steps. However, in the method of FIG. 1, since the JiJIIK
positioning ring 7 is inserted, the cost becomes higher. Also, in the method of FIGS. 3 and 4, since
the magnetic pole is formed by iron sty rolling by pressing, the rising portion does not become
right-angled, and the positioning of the annular magnet is clear because of dripping. Ride on the
steps, so between Ka * M and the magnet! I was afraid that I could make a gap. The present
invention provides a means (especially new and one-piece, inexpensive and inexpensive, and also
means for clearly positioning the partial magnet / l. That is, as shown in FIG. 54-, lower i1 @ J @ i
is one or more protrusions 10 along the circle lIK of the jJ cylindrical magnet l at the upper edge
[i # or both, and cut and raised by magnetic Wa. Therefore, the right angle W of ten is made to
substantially coincide with the inner diameter of the mass-like magnet 5 /. − Λ −) In this way,
the inner diameter of the magnet 1 and the right-angled surface of the cut-off come into contact
with certainty, and displacement of the WI III magnet '51 does not occur. Can be arranged
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concentrically. An example of the arrangement of the protrusions is shown in the figure, with the
width of the protrusions / / / Jm height is sufficient strength at around 0.1. As is apparent from
the above, the present invention is a device useful for practical use, that is, the arrangement of
the magnetic poles can be performed inexpensively and accurately, without having special parts
kM.
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