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DESCRIPTION JPS51138431

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DESCRIPTION JPS51138431
2, 1 more, title of the invention 2, inventor Ikeda Hideo Name pond 1) Hideo (1 person name
[phase] Japan Patent Office 0 JPA No. 5-1384310 published Japanese Patent No. 51. (197'6)
Shellfish 30 in the office number 646555 specification L name of the invention L name of the
invention speaker
スピーカ
DETAILED DESCRIPTION OF THE INVENTION The present invention is a speaker in which, for
example, the pole piece is formed of a member having a large number of nonmagnetic
substances to remove harmonic components of the audio current and to reduce reproduction
acoustic distortion. Particularly, it relates to the improvement of the magnetic circuit. The
magnetic circuit of the conventional dynamic speaker is often configured as shown in FIG. That
is, the configuration is such that the center pole (11 and the ring magnet (3) are attached to the
upper surface of the ring yoke (4), and the ring plate (2) is disposed on the magnet (3) And fixed
to constitute a magnetic circuit. In addition, although the thing of the external magnet type was
described as a magnetic circuit, there may be a case of a so-called internal magnet type magnetic
circuit in which a magnet is disposed below the center pole. Now, in the magnetic circuit of the
speaker configured as described above, the center hole (11 and the plate (2) are made of soft
iron or the like, and the magnetic operating point is also less than the saturation magnetic flux
density. There are many. Therefore, when a voice current flows in the voice coil (5), an
alternating magnetic flux (6) is generated, and non-linearity of the magnetic permeability μ of
the magnetic material causes a harmonic component in the current of the voice coil (6). For this
reason, harmonic distortion has arisen in the spontaneous sound of SpyEndPage: 1-force.
According to the present invention, a harmonic wave is formed by forming a part or all of a
magnetic circuit member having a magnetic gap with a member having a large number of
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nonmagnetic substances. The components are removed and harmonic distortion does not occur
in the reproduced sound. Providing a loudspeaker with a magnetic circuit. Next, one embodiment
of the loudspeaker according to the present invention will be described based on one drawing,
and FIG. 2 is a longitudinal sectional view showing the configuration of the one embodiment--in
this FIG. 2, the same parts as in FIG. With a comment. In FIG. 2, a center ball (1) is attached to the
center of the upper surface of the ring-shaped yoke (4), and one yoke (4) is concentric with the
center ball (1). Is formed thinner than the thickness of the center ball il + so that a ring-shaped
magnet (3) is not attached in the vicinity of the outer peripheral edge of the upper surface of the
upper surface. The plate (2) is fixed. A predetermined gap is provided between the inner
circumferential surface of the plate (2) and the outer circumferential surface of the center ball ftl,
and the voice coil (6) is interposed in the gap. Further, a ring-shaped magnetic body (7) is fitted
and fixed to the outer peripheral surface of the upper portion of the center ball [11].
Then, a ring-shaped magnetic body (8) is fitted and fixed also on the inner peripheral surface of
the above-mentioned play 1 = 121 corresponding to the magnetic body (71). These ring-shaped
magnetic bodies (71, +81 u voice coil width 1 are opposed to each other, and a magnetic air gap
is formed to pass a DC magnetic flux. And, this magnetic body (7+, +81 is a material having a
large number of nonmagnetic substances. In the magnetic circuit of the dynamic speaker
according to this embodiment, which is configured as described above, the magnetic body (yl, (81
having a plurality of nonmagnetic substances) is used. The other part, i.e. the part of the
ferromagnet, is fully saturated by the DC flux. Now, the above-mentioned voice coil (AC magnetic
flux (61 acting on the magnetic members +71 and +81 but generated by the voice current
flowing in 61, but since the differential permeability μd at the magnetic saturation point is
constant, The amplitude of) is very small and does not adversely affect the voice current of the
voice coil (6). For this reason, the non-linearity of the permeability μ of the center hole (41 and
the plate (2) is improved, the harmonic component of the voice current of the voice coil (5) is
reduced, and one acoustic reproduction distortion can be reduced. In the above embodiment, the
case where the center ball (11 and the plate (21 and the ring-shaped magnetic body tri, 81f are
provided on both of them is described, but this magnetic body is either the center hole or the
plate (2) It is possible to reduce the harmonic component even if only the Further, if the above
member, that is, the magnetic material is used for all of the center ball (1) and the plate (2), the
harmonic component of the voice coil current can be further reduced. Circles-As a magnetic
material having a large number of nonmagnetic substances applicable to the magnetic circuit of
the speaker of the present invention, for example, the followings can be mentioned. fll Powder
metallurgy is a magnetic material that has many holes. (2) Spheroidal graphitized cast iron
having many nonmagnetic pearlite and auslite phases in ferrite ground. (A lot of small holes were
made in 31 soft irons. As described above, according to the present invention, the center ball is
formed on the yoke, the magnet is attached to the yoke, the plate is provided on the magnet or
the yoke, and the voice coil is formed in the gap between the plate and the center ball. And a
magnetic circuit member that forms a magnetic gap by the center ball and the plate.
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Alternatively, since the whole is formed by a member having a large number of nonmagnetic
substances, it is possible to reduce the EndPage: 2 harmonic component of the voice current of
the voice coil, and to reduce the acoustical paleon distortion.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view showing the magnetic circuit
of a conventional dynamic speaker, and FIG. 2 is a longitudinal cross-sectional view showing the
configuration of one embodiment of the magnetic circuit of the speaker of the present invention.
In the figure, (1) is a center ball, (2) is a plate, (31 is a magnet, (4) is a yoke, and (51 is a voice
coil). + 71 # + 81 is a magnetic substance having a large number of nonmagnetic substances. The
same group in FIG. 1 indicates the same or corresponding parts. Agent Shino Shin-Figure 1
Figure z 10 Inventors address other than the above 1.1 ° Former Secretary of the Office 1 · · · · ¥
¥ 1 yen display of Japanese Patent Application No. 50-88785, 8 men of 1 male; speaker 3,
correction Relationship with the Case-Patent applicant EndPage: 36, subject of amendment
スピーカ
In the detailed description of the invention in the specification, column 6, the contents of
correction (1) In the specification, "austenite" is corrected to "austenite" on page 6 line 9 in the
specification. EndPage or more: 4
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