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DESCRIPTION JPS55179495

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DESCRIPTION JPS55179495
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the field portion of
the existing speaker, FIG. 2 is a cross-sectional view of the field portion of the speaker of the
present invention, and FIG. 1 is a ferrite magnet, 2 is a center pole, 3 is a magnetic gap, 4 is a
cylindrical portion of the center pole, 5 is a base portion, 6 is a yoke, 1 is a center ring, 8 is a ring
Each plane is shown.
DETAILED DESCRIPTION OF THE INVENTION This discussion f1 relates to the field portion of
the speaker. , / 77 ';' 7'2 Traditionally, speakers have used alnico magnets, but due to the sharp
rise in the price of cobalt, which is the main raw material of alnico magnets in recent years,
magnet ferriteification is rapidly promoted It is done. Since a ferrite magnet is smaller in
magnetic flux density M or smaller than an alnico magnet, it is necessary to increase the crosssectional area of VC which can obtain a sufficient magnetic flux density gold. Therefore, an
external magnet type speaker using a ring-shaped ferrite magnet has been put to practical use.
However, this external magnet type speaker has a new problem of 2) a) A large leakage flux has
an adverse effect on the cathode ray tube and other electronic components. From these
problems, attempts have been made to put into practice the use of ferrite magnets and internal
magnetic speakers with little leakage flux. However, as described above, it is necessary to
increase the cross-sectional area of the ferrite magnet even in the case of the internal magnet
type in view of the magnetic flux density, and it must be provided at the lower portion of the base
t center ball to concentrate the magnetic flux on the magnetic gear pl. This is shown in field SV
No. 1 (2) of an internal magnet type speaker using an existing ferrite magnet. In the figure, (1) 3
框 ferrite magnet, (2) is a center ball mounted on the ferrite magnet, and a cylindrical portion (4)
forming the magnetic gap (3) and its cylindrical portion (4) And the base N (5) expanded toward
the ferrite magnet (1) K from the lower end of. (6) is a yoke, which contacts the bottom of the
ferrite magnet and forms a cylindrical portion (4) of the center ball (2) and a magnetic gear (3).
(7) is a centering that straddles the center ball (2) and the yoke (6). However, in the field section
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of such a structure, the magnetic gear 7 other than the main magnetic flux passing through the
ferrite magnet (1), the center ball (21, the magnetic gear two (3), the yoke (6)) There is a
considerable amount of leakage flux that does not go through 31. According to the invention, the
shape of the center ball is changed to improve the above-mentioned drawbacks. Generally, in
order to reduce the leakage flux without magnetic gear j7 ′ ′ t − in the field section, the
center ball mounted on the ferrite magnet needs to be as large as possible with the yoke,
excluding the magnetic gear 97′f: There is. Also, in order to concentrate a large t1 magnetic
flux from the wide area 7 ヱ light magnet to the magnetic gear 4 J 7 f C, the height of the base
facing the ferrite magnet below the center pole is required to some extent.
A cross-sectional view of the field section of a loudspeaker having a center pole of a shape in
which all the above two conditions are taken into consideration is shown in FIG. 5, and a positive
[] k] view of this center pole is shown in FIG. Among these, (1) is a ferrite magnet, (27 is a center
pole mounted on a few ferrite magnets (1), and a magnetic gear ring (27) is placed at the center
of a truncated cone (5) 3) The cylinder fs (4) is moved to form a wheel. J face fill (an annular flat
surface (81 is formed on the upper surface in contact with the cylindrical portion (4)).
(61t’2! And contacts the bottom of the ferrite magnet (1) to form a cylindrical portion
(4) of the center pole and a magnetic pole 4P-91 (3). (7) is a tongue, which is in contact with the
annular flat surface (8) of the center pole and is m-fitted at the lower end of the cylindrical
portion (4), and the other is fixed to the yoke (6) It plays a role in positioning this center pole (2J
and yoke (8)). The feature of the present invention lies in the shape of the center pole (2). That is,
the annular flat surface (8) K on the upper surface of the pedestal (5) An annular fitting surface is
in contact with the outer periphery of the cylindrical portion (4) of 5 and the inner peripheral
bottom portion of the agate center ring (7) is joined, and the radius of the upper surface of the
base portion (5) of the center ball (21) ) And the radius (I) of the cylinder 5 (4) or the difference
(Z-Y) between the base (the radius of the lower surface 53 of the pedestal 5) and the radius (1) of
the cylinder N (4) Less than half of the Next, a concrete embodiment of the speaker of the
present invention. The ferrite magnet (1 in the speaker's field section with a frame height of 33
(j), a width of 50 (g) and a depth of 4 (1 (+ w)) of the rectangular yoke (6) 55 (角 X 55 (cap), y X
13 (麿)), and the radius (Y) of the cylindrical portion (4) of the center ball (2) is 7.2 (all), and its
height is 13 (■), and the base 1ll of this center ball (2) (the height of 51 is 4 (■), and the radius
of its lower surface) is 16.5 (a minor) the radius of its upper surface (g) is 9 to 11 .8 (-) or so.
When the center ball (Rinoi II (radius gO of the upper surface of the upper surface 61 is 10.4
(fi)), magnetic gyay-q7 (the magnetic flux of 31 reaches a maximum of ◆ was determined rc. At
this time, the relation srs of X, Y and Z was XY = (Z-Y) / 3-tl. (6) The center ball of the internal
magnet type speaker characterized by the present invention is composed of a truncated cone
base placed on a ferrite magnet and a cylindrical part planted in the center of the base, the center
ball The upper surface of the pedestal portion has a joint surface in contact with the outer
periphery of the indwelling portion and joined to the inner peripheral bottom portion of the
center ring, and the difference between the radius of the pedestal upper surface of the center ball
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and the radius of the cylindrical portion is Since the difference between the radius of the lower
surface of the lower portion and the radius of the cylindrical portion is equal to or less than half,
the above-described platform compared to the existing speaker described above!
Ill has a large lli area without approaching the York. According to the above-mentioned center
ball, the magnetic resistance of its base portion is lightened and reduced, and the magnetic flux
of the ferrite magnet can be efficiently concentrated on its cylindrical portion, so that the
magnetic gear # 1 does not leak all over The flux is reduced and the flux density in the magnetic
gap is increased. Furthermore, since the annular flat surface of the upper surface of the base
portion of the center ball is the joint surface of the center ring fitted to the cylindrical portion,
the holding strength of the centering to the center ball is increased, and the conventional alnico
magnet is used. There is also an advantage that the center ring incorporated in the lightweight
field section of the magnetic type 7 speaker is diverted to the speaker of the present invention.
4L drawing of the figure 1 cross-sectional view of the field part of the speaker present in Figure
1, Figure 2 is a cross-sectional view of the field part of the speaker of the present invention, 13H,
the speaker of the present invention (1) is a ferrite magnet, (21H center ball, (3) magnetic gear, ·
no, (4) is a cylindrical portion of the center ball, (5) a base portion, (6 ) Is a yoke, (7) is a center
ring, (8) a circular plane, all are shown. Dream proposal # draft registered person in charge,
representative of Sanyo iI Fence Co., Ltd., Iekei,-2, 'FIG. Fig. 3 碍 □) Utility model applicant
Applicant Sanyo I-I representative Ike 55, other than the above inventor address Moriguchi city
Keihan main street 2nd address 18 Sanyo Electric Co., Ltd. Name Mori 1) Tobunbun address
Same name as Ashiya Ashikatsu Pa) 'Tenari / Kupu 乙,! (
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