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Patent Agent Director 4 の 's Name Sbi' Car 1 iii Inventor Patent Assignee Address Chiyoda Ward,
Tokyo 2nd, 1st No. 2, Marunouchi Name (508) Representative of Hitachi Metals Co., Ltd. Norio
Kono Representative Office Tokyo Chiyokawa Marunouchi Ku--No. 5 No. 1 within Hitachi, Ltd.
[Phase] Japan Patent Office ■ JP-A-52-133110, published by Japan. (1977) 2.1 Agency internal
reference number 6 /: l! Speaker magnetic circuit Contact with the inner wall of the radially
magnetized cylindrical magnet. Attach most of one yoke as you like, attach a part of the other
yoke so that it touches the outer wall, look at the end, and even with the horizontal or horizontal
magnet, forming this caustic and magnet at the other end A speaker magnetic circuit
characterized in that a space portion to be kept is within 0 to 5 m, and a movable coil
interlocking with a cone is installed in a space formed by a part of these two yokes.
It relates to a detailed description of the invention. Recently, along with the widespread use of
ferrite magnets and rare earth magnets, external magnet type magnetic circuits have been
increasingly adopted as speaker magnetic circuits. Fig. 1 shows a longitudinal cross-sectional
view of the example. · In Fig. 1, 1 to 3 are yokes, yoke 1F1 is cylindrical and yoke 2 is discshaped and yoked. The reference numeral 3 denotes a disk-like member provided with a circular
hole 3a in the center, and 5 denotes a hollow cylindrical permanent magnet or stone, which is
held between eyes 23 and yoke 1 The lower end of the cylinder is fixed to the yoke 2 and the
other end is faced to the inside of the yoke 3 for assembly. In the sky @ 4, a speaker carp. The
moving coil is mounted via the moving coil attached to the In response to the strength of the
audio current flowing through the speaker, the speaker coin generates vibration by vibrating. In
a magnetic circuit made of wooden barrels, the permanent magnet 5 has a hollow cylindrical
shape 9 and is magnetized in the axial direction so that a pair of magnetic poles N, 8 appear on
the upper J end faces. Empty l! I4 requires that there be sufficient flux density to oscillate the
cone, as well as flux uniformity. Characteristics 1d, 15r of permanent magnets in FIG. The
dimensions are 260 ck SHo 18700 e and H 034 600 @ S dimensions are circular with a diameter
of 248 J 5 'X outer diameter 37.4 × width 9. The gap 4 in FIG. 1 is 055 m + 11 and its magnetic
flux density is Ji' 070 G. In these external magnetic type magnetic circuits, in addition to the
advantage that a large magnet cross section perpendicular to the magnetization direction can be
taken, the maximum energy product EndPage: 1 (BH)! Il & X is low, but the coercivity is large and
inexpensive. There is an advantage that a certain 7 light magnet can be used. However, this
external magnet type speaker has the above advantages. Although it has a serious drawback of
having a large amount of leakage flux. つた。 For example, if this external magnetic type
magnetic circuit is used in a television, it will distort the image, and if this magnetic circuit is
used also in a transistor radio etc., a wide range which does not affect the surroundings in
consideration of leakage magnets. Installation method is taken. The present invention not only
has the effect of reducing such a leakage magnetic flux, but also has a material, shape and
dimensions identical to those of a conventional permanent magnet, and a speaker magnetic
circuit in which the generation efficiency of air gap magnetic flux is superior. For the purpose of
offering FIG. 2 is a vertical cross-sectional view showing an embodiment of the present invention,
in which 6.8 is a yoke, and a yoke 6 except for the inside shown by a dotted line can be used for
reduction. The inner diameter portion 7a of the permanent magnet 7 is inserted into the outer
peripheral portion.
Furthermore, the outside of the permanent magnet? bK A table-like yoke 8 is inserted, and the
other end of the yoke 6 is faced to the hole 8 & of the yoke 8 to form an empty space 11I. A
moving coil (not shown) attached to the gap speaker cone is inserted in the air gap 9 to generate
sound by sound and current flowing through the moving coil. In a magnetic circuit made of
wooden barrels, permanent magnets generally have a thin-shaped hollow cylindrical shape, and
the magnetization direction is a permanent magnet circle. Radial direction so that a pair of
magnetic poles appear on the inner and outer surfaces of the cylinder. Magnetize. This in a
magnetic circuit like this. Used for assembly. The gap flux density measured by keeping the film
gap 9 at α 6 m and sequentially changing the difference 10 with the yoke 8 by changing the
simple magnetization direction using the same size as the conventional permanent magnet. As
shown in the table, increasing gradually from 0 to 1 ■, 1 lill difference is the highest flux, and.
Below j! Although it is lowered to 3.4 and 1, it is as shown in FIG. After all, the bottom of the
magnet on the open side of the yoke becomes horizontal, and on the other hand, the difference
between the yoke 8 and the magnet 7 is that the size of one quake is the characteristic of the
maximum value, which is about twice the characteristic of the conventional Recognize. Further,
FIG. 5 is another use of the air gap 9 according to the experiment of the present inventionaccording to the above-mentioned at any position on the yoke 8 &. Double the same as above by
securing the dimensions like. The characteristics of were obtained. As described above, according
to the present invention, by using the same shape and size of the material, the characteristic
which has not been overcome by the movement of the space of the yoke by the movement of the
space is nearly twice as large as that of the prior art III! Not only the magnetic flux density can be
obtained, but the leakage flux is greatly reduced, and the acoustic products etc. for which the
external magnetic type magnetic circuit can not be applied to speakers such as radio, television,
record and tape recorders Also, the technology of the present invention can be used, and the
following effects can be obtained. (1) By changing the direction of the yoke and the
magnetization direction, a magnetic force nearly twice that of the conventional one was obtained.
(2) The leakage magnetic flux is greatly reduced by radially magnetizing the magnetization
directions on the inner and outer surfaces using a pile-like yoke. (3) By reducing the leakage flux,
the acoustic product can be made smaller. (4) It is possible to increase the coverage of the central
part, and the voice. The diameter of the coil is increased and distortion of sound is reduced. Many
effects are obtained.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a conventional
magnet circuit for a speaker, FIG. 2 is a longitudinal view showing an embodiment of the present
invention, and FIG. 3 is a yoke and a magnet for explanation of the present invention. Dimensions
of Partial cross-sectional view showing the difference, FIG. 4 is the dimensional difference of FIG.
FIG. 5 is a cross-sectional view in which the air gap of the yoke is moved in another embodiment
of the present invention. Eye; 5.7: magnet, 4.9: air gap. Agent Patent Attorneys 1) Toshiyuki
EndPage: 2 List of attached documents (1) Details δ 1 (2) 1 l jl 1 (3) Power of attorney 1 (4)
Patent WRIIA book 1 pass-4 stroke-hot 1 End Page : 3
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description, jps5213311
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