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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a demagnetization curve diagram for
explaining the operation of a magnetic circuit, and FIGS. 2a and 2b and 3a and 3b are sectional
views of different embodiments of the present invention. Indicates In the figure, 1 and 11 are
magnets, 2.12 is an upper yoke, 3 and 13 are lower yokes, 4 is a ball, 14 is a projecting portion,
5 and 15 are air gaps, and 6 and 16 are enlarged portions. [Phase] Japan classification 102 K
231 {} 2 K 3 ■ Japan Patent Office published utility model Gazette No. 645-556465-55 ■
Actual opening $ 9-148040 Denshi 49 (1974). 12.20 Hearing request ■ Suka Sevenka [Facial]
代 48-4.6 537 48 48 (1973) same as applicant on April 20 21 Hyoken attorney of Kageyama city
Yachiyo street 3 Hiroshi Ishiyama 1 person ■ real [phase] out [phase] invention ■ application
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic circuit
in which the cross section of the magnetic space is increased. The magnetic (R) path using the
barium ferrite magnet is provided with yokes respectively on the 1st and lower sides of the ringshaped magnet, and in the case of the outer a type, the lower yoke Q central portion is extended
upward to form the upper rim ] In the case of an inner magnetic type in which an air-air duct is
formed between the above-mentioned central extension portions, the peripheral portion of the
royal 1 yoke is extended upward to form a lower-end yoke. Where a magnetic air gap is formed
between the peripheral extension, the yaw (2) becomes thinner if the yoke and the magnet are
simply made thinner in order to make the path of the above configuration thin. Approximately,
the magnetic gap cross-sectional area (A, SLl decreases). Also, since the ratio (Am / I, ya) of the
cross sectional area of the magnet to the magnet height becomes large, the leakage coefficient I
of the magnetic circuit becomes large due to the reduction of the gap iII + 棺. The theoretical
formula is A = F,! ! i, 表 わ / LpAtn where f is represented by the magnetic gap width as the
magnetoresistive coefficient L's, but as described above, while the gap cross-sectional area (five
9) decreases, the I11 leakage coefficient (Fl becomes larger The product (A) · F of the two is equal
to the yoke thickness (1,), and becomes smaller as (Lm / Am) becomes It if the yoke thickness
becomes smaller. For these reasons, the permeance will generally be low. Therefore, the
operating point of the magnetic circuit may be lowered, and in extreme cases it may be lower
than the inflection point A on the demagnetization curve shown in the first section. In the area
under the inflection point month, the speaker magnetic circuit becomes thinner in the present
invention, which becomes susceptible to the influence of the temperature above the magnet and
other magnetic fields and becomes an unstable magnetic circuit, and The magnetic circuit of the
present invention is obtained by improving the defects as described in 2). Q An example in which
the magnetic circuit of the present invention is applied to the inner dn 8 type and the outer
magnetic type to the second roof taXb + and the second blind tile. Each is shown. In the copper
2b, the ring-shaped barium ferrite magnet 1 is polarized in the axial direction, and the upper and
lower sides are provided (t and yoke 2.3 are provided respectively and the lower surface of the
yoke 3F11 center position kK upper surface of the upper yoke 2 A circular through hole 5 is
provided at the center position of the upper yoke 2 # 'i in which a cylindrical hole 4 to be ground
to a flat surface is integrally molded, and the inner peripheral wall of the through hole is in the
magnetic circuit. An enlarged portion 6 of the face with an expanding pair of minutes 6
projecting towards the bottom is provided so as to be located apart from the magnet so as not to
cause the 38 "smoke path" the pole 4z in the through hole of the upper yoke A magnetic gap is
formed between the upper portion of the pole 4 and the inner peripheral wall enlarged portion 6
of the through hole 5.
In the embodiment of the second evil ta +, the inner circumferential wall is expanded in the form
of a tapered shape whose inner circumferential expansion is large, and gradually decreases
toward the outer circumference by 1 、, but is formed by the projecting edge at the second evil +
b> (3) In the thirty-first embodiment, the magnetic circuit is configured by providing the upper
fE1 and the lower 1liIK of the ring-shaped barium ferrite magnet 11 with the respective yokes 12
and 3 respectively. The upper N ′ ′ aa-boke magnet 11 is formed to be slightly larger than the
upper part 11 and has an enlarged portion 16 facing toward the inside of the magnetic circuit at
the outer periphery thereof. Expanded part 16 and small 91! At the third failure (a), the d
enlarged portion 16 and the outer periphery are large, and are gradually tapered in the inward
direction. At 31i ut b), the protruding edge In the embodiments of the second and third bad
cases, the enlarged parts 6 and 16 project toward the inside of the magnetic circuit, but in other
working forces, they project to the outer corner of the magnetic circuit And the pole reef and the
projection 14 were extended accordingly. As described above, according to the present invention,
as described above, the portion where the upper yoke forms the magnetic air gap is more
mysterious than the portion where the yoke covers the magnet. Because of the large size, the
cross-sectional area (A) of the magnetic (4) air gap can be kept large even if the yoke thickness is
reduced. For this reason, a drop in permeance can be prevented, and it can be reduced that the
operating point of the magnetic circuit falls below the inflection point A of the demagnetization
curve. A stable, high-steering, semi-operating magnetic circuit can be obtained accordingly)), 4 m,
1 m surface! The rate of i + 2 第 第 11 is the demagnetization-ik た め 凶 説明 to explain the
operation of the magnetic circuit, (217 (a X l) J and the third ((a b b) are each 断 Af J of the
present invention. [1111 & in the middle, l · 11 is a magnet, 2 · 12 is an upper piece yoke. 3 · 13
underside yoke, 4 ball, 14JI'i projecting portion, 5 · 15 air gap, 616 翻 enlarged inversion agent
representative attorney 理 ± 8! j + Hiko (5) 八 8 BH / 6 # 52 (z 6 ′ ′ 7 7 − 1 斗 3 3 3 1 1 [b]
(a) · 2 + 7 +, x 1 z tl tl / 2 □ + 4 ′ ′ 1311 ta) 7377th> · S-7 l'Jt, Ol Ho 7g woven Shi 'Yag · 4 Sit ·
& Association-representative Ai Fukushi Aihiko
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jps49148041, description
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