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JPS54179131

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DESCRIPTION JPS54179131
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional horn
speaker, FIG. 2 to FIG. 4 a are front views near magnetic gaps in the conventional speaker, and
FIG. Fig. 5 shows an example of output sound pressure characteristics and distortion
characteristics of a conventional speaker, and Figs. 6 to 8a are cross-sectional views of the
vicinity of a magnetic gap of the speaker according to an embodiment of the present invention.
The figure which shows the magnetic flux distribution figure, FIG. 9 is a figure which shows the
output sound pressure characteristic and distortion characteristic example of a speaker at the
time of using the magnetic circuit which is-embodiment of this invention. 5 и и и и и и и и и и и и и и и и и и и и
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magnetic gap, 10 и и и и и voice coil. ???????????? -W D-4 W-N W ? V
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodynamic
loudspeaker, and it is an object of the present invention to improve the characteristics by
matching the center axis of the magnetic gap and the center of the mean-a field. Take a horn-type
speaker as an example, and use the drawing to clarify it. FIG. 1 shows an example of a
conventional horn-type speaker, wherein 1 is an earpiece cover, 2 is a diaphragm, 3 is an
equalizer, 4 is a throat, 6 is a plate, 6 is a ball, 7 (. A yoke, 8 is a magnet, 9 is a magnetic gap, 1 o
is a voice coil, and 11 is a horn. The shape of the ball 6 takes various shapes depending on the
shape of the equalizer 3 in the horn speaker of the Dakka 9/2 first section 1 which is configured
to be open. Second (gai ? ? l: indicates a general forgery near the magnetic gap, the tip surface
of the plate 6 forming the magnetic gap and the tip of the ball 6 coincide, and the tip angle of the
ball 6 is ? = It is 900. FIG. 2b shows the relationship between the distance between the magnetic
field of the magnetic gap 9 and the relative magnetic flux distribution in FIG. 2A, and it is
apparent from the figure that the central axis of the magnetic gap 9 and the center of the
uniform magnetic field You The rate of decrease of the magnetic flux outside the covered
magnetic gap 9 grows large on the bottom side and the tip side of the magnetic gap 9 and the
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average magnetic field is somewhat narrower than the width of the ball gap surface 9 of the ball
e and the plate 5 ing. When the center of the voice coil 10 is made to coincide with the position
of the central axis of the magnetic gap 9 determined from the shape in such a magnetic circuit,
the second high-leg wrinkling distortion is produced particularly in the low-pitch range where
the amplitude is large. There is a drawback that the third distortional temporary distortion and
the like increase. FIG. 3A shows another conventional counterfeit example, in which the magnetic
gap 9 is formed by setting the tip angle ? of the ball 6 to an acute angle (? <90 ░) based on
the shape of the Nita 3 equalizer 3. Although the tip angle ? of the ball 6 is an acute angle, the
magnetic resistance is increased due to the acute angle, and the air gap flux strength on the tip
side decreases as in the same jlb, and the same defect in characteristics as the conventional
example of FIG. is there. Further, FIG. 4 a is another conventional evening 11, in which the outer
periphery of the equalizer (?2 ? =, 2 @ ?173 is a part of the ball 6, the tip angle ? total
depression angle ~, ?97, dk: i (??--magnetoresistance of the ball 6 near the magnetic air gap 9
as? 90 ░)? Smaller combs, broadening the field width, reducing the total deviation of the
central axis with the magnetic blank 1 and 9, and trying to make the flux distribution in the
upper and lower layers outside the magnetic gap 9 cool. However, as shown in the figure, the
distribution of the magnetic flux density is still asymmetric with respect to the central axis. The
characteristics of the horn speaker using the above-described eight conventional circuits are as
shown in FIG. 6, and there is a lot of distortion in the low frequency range which tends to be
large amplitude.
Needless to say, this distortion is a distortion due to the uneven distribution i / (-of the magnetic
field. The present invention is intended to eliminate the above-mentioned drawbacks and to
provide a speaker with a small amount of noise due to a magnetic circuit. 6a shows the structure
of one embodiment of the present invention corresponding to FIG. 2i aiC, in which the front end
surface of the plate 5 forming the magnetic quantity @ 9 and the front end surface of the ball 6
are staggered. The end face of the ball 6 is configured to be higher than the end face of the plate
6 by a distance 12 (several stitches), orcoz u ('arrangement' 60 and 11 th и sixth factor. The
distribution of the well-known ? Higashi shown in b is the geometry of the magnetic air gap / ::
'-? ? и ? central axis #-IVL is small' и force 9 и average-width of the boundary 24 ? 1 Widely,
the difference in the reduction of the magnetic flux density outside the magnetic amount 11119
(the difference between ? and ? и level is also better than in the prior art). (--The same as the
embodiment of the present invention corresponding to the structure of FIG. 3 a as in the case of
the seventh embodiment a-7 J), the tip of the ball 6 is made higher than the tip surface of the
distance plate 5 . The seventh column 1b (? is the magnetic flux distribution of the magnetic gap
9, and it can be seen that a large improvement is made as compared with the prior art. 8d is an
embodiment of the present invention corresponding to the prior art shown in FIG. 4a, and
similarly, the end of the ball 6 on the side of the air gap 9 is separated by a distance of 1 mm
from the end surface of the plate 6. ?& L, CVs??6 ? ? OP, 5 fz ? ? 000 ? ? 0 magnetic
flux 615 ?, and it can be seen that there is a great improvement effect compared to the
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conventional case. FIG. 9 is a characteristic example of the embodiment of the present invention,
and it can be seen that the second high p-wave distortion third harmonic distortion in the bass
region is greatly reduced as compared with the conventional characteristic of FIG. As in the
present invention, at the end face of the ball forming the magnetic air gap and the end face of the
plate, the end face of the ball is the end +4 of the plate 5! By simply moving from the surface (for
example, several layers), it is possible to greatly improve ? due to the magnetic field distribution
in the low region of the speaker. Moreover, the cost can be the same as in the prior art. In
addition, although the horn speaker of the short voice coil has been described as an example in
the above, the same applies to a long voice coil, and the same operation and effect can be
obtained from other cone-shaped speakers and dome-shaped speakers.
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