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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
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
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description, jps5291033
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