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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of an example of a conventional
magnetic circuit, partially shown in cross section. FIG. 2 is a cross-sectional principle diagram
showing the state of magnetic lines in the conventional magnetic circuit shown in FIG. FIG. 3 is a
cross-sectional perspective view of the parts used in the embodiment of the present invention.
FIG. 4 is a side view of an embodiment of the present invention, partially shown in cross section.
FIG. 5 is a cross-sectional principle diagram showing the state of magnetic lines in the
embodiment of the present invention shown in FIG. 1 ?, 1 ? ... center pole, 2 ?, 22 ... annular
magnet, 2/2 ... center hole, 31.32 иии-coronal yoke, 3 '2 и и center hole, al) a2 "" gap, A-A. BB---cross
section. Poem 3 And 2
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the construction
of a magnetic circuit for magnetically vibrating a voice coil in a speaker. The example of the
conventional magnetic circuit shown in FIG. 1 is to insert the annular magnet 21 from the rear of
the center pole 1 ? and the coronal yoke 31 and decide on the gap to be bonded and assembled.
In the example of Fig. 2, the insertion and bonding of the wedge-shaped magnet with the gap a
determined requires skillful nine operations. Also, in FIG. The magnetic flux density passing
through the inside is gradually coarser in the lower part below the cross section mume, and
hence the center pole 11. Coronal pole 3. The effective usage rate of each volume of the
company gradually decreases as you go to the swallowing area below the company's cross
section mume. Furthermore, annular magnets 2. Since the length of the wire from the lower part
of the magnetic lines of force shown by the dotted line is longer, the air efficiency to the
magnetic is reduced, and the magnetic strengths of the upper and lower parts when passing into
the gap are different. The present invention is a magnetic circuit having a structure intended to
eliminate the above-mentioned drawbacks. An embodiment of the invention will now be
described with reference to the drawings. This invention l! In the embodiment, as shown in an
exploded cross-sectional perspective view in FIG. 3, there is a coronary artery consisting of a
horizontal portion having a center port #: which is tapered toward the lower side, a central hole
3: and an overhang peripheral wall having a tapered cross section. 3. ?????????? Hole
2 that can be held to the tapered portion of the main body 2 and coronal yoke 3. (See Fig. 4),
which has a conical outer part 13 having a total of 1 ? ? e 11 on the inner circumference of the
cone and an opposite magnetic pole on the inner circumference and the outer circumference, and
the thickness increases with the lower part. As shown in the above, the inner peripheral wall 'of
the circumferential wall of the coronal yoke 3s and the outer circumference of the annular
magnet & are bonded to each other to form the annular magnet 2. Center hole 2; center pole 1;
Bond the tapered portion of the gap &, determine the end of the assembly. One-adhesion above
are both coaxial conical surface adhesion -, et al, do not require skilled operator to determine the
adhesion ? position holding back was required during cylinder surface adhesion, also in FIG. 5
As shown, useless volumes unnecessary for passage of magnetism in the center pole h and the
crown fall yoke 3 ░ O cross-section BB or less are removed, and furthermore, the magnet 2. The
magnetic and OO strength is also magnet 2. Since the lower part of the magnet is longer between
the poles of the magnet, the stronger magnetism works than the upper part, but the length of the
magnetic field line with the strong magnetism from the lower part becomes the president, and
the magnetic efficiency decreases. The magnetic strength of the upper and lower parts when
passing through can be equalized. In addition, the structure of the above magnetic circuit can be
applied to a moving coil type microphone and four telephones.-As described above, according to
the present invention, the assembly of the magnetic circuit can be performed extremely easily
and reliably without requiring skill on page 4. Unnecessary volume of the part can be eliminated
and the shape of the magnet can be effectively changed to make the magnetism acting on the
gap ideal.
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