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DESCRIPTION JPS5187027

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DESCRIPTION JPS5187027
2. Inventor Susuki Hiroshi Name: Mr. Suzuki Yuu (1 other person) 3, Patent applicant zip code
100 Address Tokyo, Tokyo Chiyoda Ward Marunouchi 2nd 2nd 3rd '? Japan Patent Office ? JP
JP 51-87027 @ Japanese Journal 51. (1976) 7.30 t% V / ? specification 1, name of the
invention
Speaker's magnetic circuit
3, detailed description of the invention. Low-Saturation-Saturation-It is made of a material that
exceeds the flux density. The magnetic circuit of the speaker is often configured as shown in FIG.
1 in which the harmonic component of the audio current is removed and the reproduction
acoustic distortion is reduced. That is, the center pole 1 and the ring-shaped magnet 5 are
attached to the upper surface of the ring-shaped yoke 4, and the ring-shaped plate 2 is disposed
and fixed on the magnet s to form a magnetic circuit. ing. As the magnetic circuit, although the
external magnetic type is described, a so-called internal magnetic type magnetic circuit in which
a magnet is disposed below the center pole may be used. Now, in the magnetic circuit of the
speaker configured as described above, the center pole 1 and the plate 2 are made of soft iron or
the like, and the magnetic operating point-is often less than the saturation magnetic flux density.
Therefore, when the voice current flows in the voice coil 5, an alternating current flux 6 is
generated, and the aI1w14 wave component is generated in the current of the voice coil 5 due to
the non-linearity of the magnetic permeability .mu. Because of this, the harmonic distortion has
fallen to the playback sound of the speaker. EndPage: This invention was made to eliminate the
above-mentioned conventional defects of WIi2, and removes high-wave components by forming a
member having a magnetic saturation magnetic flux density forming a magnetic gap. It is an
object of the present invention to provide a speaker magnetic circuit in which high-wave
distortion does not occur in reproduced sound. Next, the embodiment of the magnetic circuit of
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the speaker according to the present invention will be described based on the drawings. FIG. 2 is
a longitudinal sectional view showing the configuration of the one embodiment. In FIG. The same
code is attached and described. In FIG. 2, a center ball 1 is attached to the central portion of the
upper surface of the ring-shaped yoke 4 so as to be concentric with the center ball 1. The upper
surface of the yoke 4 is in the vicinity of the outer peripheral edge thereof. A ring-shaped magnet
3 is attached to the. The doughnut-shaped plate 2 is fixed to the upper surface of the magnet 3 of
the kernel. A predetermined gap is provided between the inner circumferential surface of the
plate 2 and the outer circumferential surface of the snow pole 1, and the voice coil 5 is
interposed in the gap. Further, a ring-shaped iron alloy 7 is fitted and fixed to the outer
peripheral surface of one upper portion of the center ball 1. A ring-shaped iron alloy 8 is fitted
and fixed to the inner peripheral surface of the plate 2 in correspondence with the ferrous alloy 7
coughing at noon. These ring-shaped iron alloys 7I8 face the voice coil 5 and form a magnetic air
gap for passing a DC magnetic flux.
And, in the magnetic circuit of a speaker having a magnetic permeability higher than that of soft
iron and low in saturation, this soft magnetic material has a high magnetic permeability in soft
magnetic particles and a low saturation magnetic flux density (iron alloy Since these members
are formed by 7t8), as shown by the solid line 708 of FIG. 5 (the magnetization curve is shown,
the magnetization axis is on the horizontal axis, and the magnetic flux density is on the vertical
axis), Saturated enough. Reference numeral 102 in FIG. 3 denotes the magnetization
characteristic of soft iron. The intersection point of the magnetization% notes 708 and 102 is the
operating point of the DC magnetic flux. Now, although the current change flux 6 generated by
the voice current flowing through the voice coil 5 acts on the iron alloy 7.8, the differential
magnetic permeability ?d at the magnetic saturation point becomes longer, and the alternating
current flux swings Not adversely affect For this reason, the non-linearity of the permeability ?
of the center ball 1 and the plate 2 is improved, the high gradient wave component of the voice
current of the voice coil 5 is reduced, and the acoustic reproduction distortion can be reduced. In
the above embodiment, even if the ring-shaped iron alloys 7 and 8 are formed on both the first
pole 1 and the plate 20, the reduction of the harmonic components can be measured. Further, if
the above members, that is, iron alloys are used for all of the center ball 1 and the plate 2, the
harmonic components of the voice coil current can be further reduced. The saturation magnetic
flux densities of commercially available iron alloys and soft iron applicable to the magnetic
circuit of the speaker according to the present invention are as shown in Table 1 below. EndPage:
2 or more, according to the present invention, the center ball is formed on the yoke, a magnet is
attached to the yoke, a plate is provided on the magnet or the yoke 1, and a space between the
plate and the center ball Since a voice coil is interposed in the gap, and in particular, a part or all
of the magnetic circuit member forming a magnetic gap formed by the center pole and the plate
is formed by a member having high permeability and low saturation flux distribution, The
harmonic components of the voice current of the voice coil can be reduced, and the sound
reproduction distortion can be reduced.
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4 is a longitudinal sectional view showing the configuration of an embodiment of the magnetic
circuit of the brief description of the drawings. FIG. 5 is a magnetization fluctuation diagram for
explaining the magnetic circuit of the above-mentioned speaker. 1
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Fist yoke 5
ииииииииииииииииииииииииииииии Iron alloy Note that the same reference numerals in the figures The same part or
a corresponding part is shown. Agent Shino Nobu-6, Inventor inventor Ihada Hideo Name Pond
1) Hideo Sumi Ffr Dossier Tsucha Hideshi Name Tsuchiya Eiji EndPage: ?
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