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JPS60229499

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DESCRIPTION JPS60229499
[0001]
FIELD OF THE INVENTION The present invention relates to a flat speaker used for various
acoustic devices. The structure of the prior art and its problems In general, the flat speaker was
constructed as shown in FIG. That is, the frame 6 is coupled to the magnetic circuit 6 configured
by laminating and combining the ring-shaped magnet 3 and the ring-shaped plate 4 on the plate
2 having the center pole 1, and the gasket e 7 and 8 are attached, and the peripheral edge of the
flat diaphragm 90 is coupled to the top edge, the drive cone 10 is coupled to the lower surface of
the flat diaphragm 9, and the central portion of the drive cone 10 is The voice coil 12 which fits
into the magnetic gap 11 of the magnetic circuits is coupled, and the voice coil 12 is held by the
damper 13. In such a flat speaker, the band expansion is performed to the second resonance by
driving the position of the node of the first resonance mode of the flat diaphragm 9. However,
since the central portion of the flat diaphragm 9 causes abnormal resonance such as split
resonance, the sound pressure frequency characteristic is adversely affected to cause remarkable
peaks and dips in the high frequency range. A and C in FIG. 2 show the sound pressure frequency
characteristics and the second distortion of the conventional flat speaker Ob and d have
relatively high internal loss in the skin material and drive cone of the flat diaphragm and are
relatively soft. The sound pressure frequency characteristic and 2nd distortion of the flat speaker
which used the material are shown. In this configuration, although peaks in the high range are
eliminated, there are problems such as a decrease in sound pressure level in the entire high
range, a significant increase in second-order distortion, and the like. There is also a structure in
which the central portion of the flat diaphragm is cut off and filled with a foreign material with a
large internal loss, but with this structure, the appearance quality is degraded, the cost increases
due to the increase in the number of steps in the flat diaphragm manufacturing process, and
planar vibration. There is a problem such as a decrease in high frequency reproduction
frequency band due to a decrease in surface rigidity at the center of the plate. The object of the
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present invention is to eliminate the above-mentioned conventional drawbacks, and it is an
extremely simple structure to correct anomalous resonance at the central portion of a flat
diaphragm and to flatten sound pressure frequency characteristics, It is an object of the present
invention to provide a flat loudspeaker which is extremely effective. SUMMARY OF THE
INVENTION In order to achieve the above object, the present invention provides skins on both
sides of a core material provided with circular and non-circular cut parts in the central part via
edges at the peripheral part of the frame coupled to the magnetic circuit. A flat diaphragm
attached with a material is attached, and a voice coil to be fitted into the magnetic gap of the
magnetic circuit is coupled to the flat diaphragm. With this configuration, the strength and the
appearance quality of the flat diaphragm are not deteriorated. The sound pressure frequency
characteristics can be flattened with a simple configuration.
Description of Embodiments Hereinafter, embodiments of the present invention will be described
with reference to the drawings. Since the configuration of the flat speaker is substantially the
same as that shown in FIG. 1, only the flat diaphragm as a feature of the present invention will be
described here. FIG. 3 shows the structure of the flat diaphragm of the flat speaker of the present
invention. That is, the core 9a is formed by cutting the center 9b of the core material 9a of the
neo-Nikam structure once using a punching die and then fitting the center 9b of the core 9a cut
into the original position. The flat diaphragm 9 was formed by sticking the aluminum skins 9c
and 9d up and down. In this case, there is no influence even if the positions of the core member
9a and the central portion 9b shift when the central portion 9b of the core member 9a is
inserted. Similarly, the diaphragm was formed in the same manner for the shape shown in FIG. In
FIG. 4, (a) is an example in which the central portion 9b of the circular core member 9a is cut
into a circular shape, and in the following (b), the central portion 9b of the circular core member
9a is squared (C) The central portion 9b of the circular core member 9a is elliptical, (the peak is
the central portion 9b of the rectangular core member 9a square K, and the → is the cutting of
the central portion 9b in (d) shifted by 46 degrees , (F) circular the central portion 9b of the
square core member 9a, (q) oval the central portion 9b of the square core member 9a, and (h)
the straight portion and the circular arc of the peripheral portion (I) the core portion 9b of the
continuous shape is squared, (i) is a core portion 9b of which the cutting of the center portion 9b
is shifted by 46 degrees, (i) The central portion 9b of the material 9a is made circular, (g) the
central portion 9b of the core material 9a having the same shape as that of (i) is made elliptical,
and (1) is the same as (h) The central portion 9b shaped for core 9a to the outer shape similar to
the shape, is obtained by cutting, respectively. The diameter or size of the cut of the central
portion 9b is remarkably effective when the diameter or size of the diameter or size of the flat
diaphragm 9 is 15% to 35-. By cutting the central portion 9b of the core member 9a of the flat
diaphragm 9, appropriate compliance is given near the central portion of the sound axis, and this
compliance causes abnormal resonance of the central portion in the high region. It had caused
the reverse resonance to cancel out. Furthermore, the weight of only the central portion 9b of the
core member 9a independent of the weight of the planar imaging plate 9 is present at the central
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portion, and a loss is given to the amplitude of the planar diaphragm 9 of the planar speaker. The
divided vibration of the part is suppressed. A similar experiment was performed on the one in
which the cut portion of the core material 9a was discontinuous.
FIG. 6 shows this embodiment, in which (a), (b) and (C) respectively indicate four points on the
arc and two points on the arc of the central portion 9b of the circular core member 9a. (4), (e),
and (f) make the center portion 9b of the square-shaped core member 9a elliptic at two points,
respectively, with four points left as non-cut portions in the square shape. 4 points on top, 4 noncut parts left in square shape, discontinuous, (q), (to)), (i) core material whose peripheral part is a
continuous shape of straight line and arc The central portion 9b of 9a has four points in a square
shape, four points in an arc on an arc, and two non-cut portions in an elliptical shape so as to be
discontinuous, and the remaining portion is penetrated. . In this case, there were significant
effects when the number of discontinuities was less than 30. Furthermore, the same experiment
was performed also about what made the cutting part a part of thickness direction of the core
material 9a. FIG. 6 shows this embodiment, where (a) is a front view of the core member 9a, (b)
and (C) are cross-sectional views of the core weir 9a. (B) is an example in which a cut is made
from one side in the thickness direction, and (C) is a cut made from both sides in the thickness
direction. In this case, the depth of the cut was effective when it was 6o% or more of the
thickness of the core material 9a. The sound pressure frequency characteristics and the second
distortion of the flat speaker using this flat diaphragm are shown in FIG. 7 and FIG. FIG. 7 is a
circular flat speaker, and FIG. 8 is a square flat speaker, which is shown in each drawing (e). (Q)
and (f), Φ) show sound pressure frequency characteristics and second-order distortion.
Compared to the conventional flat speaker in FIG. 2, the peak of the high range is significantly
down, the sound pressure level of the entire high range is not down, and the distortion is also
small. In addition, as a flat speaker, although what connected the voice coil 12 to the flat
diaphragm 9 in FIG. 1 via the drive cone 1o was shown, it is also as a structure which couple ¦
bonds the voice coil 12 directly to the flat diaphragm 9. Since the flat speaker of the present
invention is configured as in the above, the invention achieves the same effects as described
above. 0 The peak of the sound range can be removed, the sound pressure frequency
characteristic can be made flat, and the appearance quality is not deteriorated, and the industrial
value is great.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a cross-sectional view showing a general flat loudspeaker, FIG. 2 is a characteristic view
of sound pressure frequency characteristics and second distortion of the conventional flat
loudspeaker, and FIG. 3 is one embodiment of the flat loudspeaker of the present invention. Fig. 4
(a) to (1), Fig. 6 (a) to (i), and Fig. 6 (,), (b).
(C) is a top view and a sectional view showing an embodiment of the core material of the flat
diaphragm of the present invention, and FIGS. 7 and 8 show the sound pressure frequency
characteristics and the second distortion of the flat speaker of the present invention FIG. 1
·······································································································································································································
·································· Frame ... Gasket, 8-Engineering. Ji, e · · · · · · · Plane diaphragm, 9a · · · Core
material, 9b · · · central part, gc, 9d · · · · · Skin material, 10 · · · Drive cone, 11 · · · .... Magnetic gear
5. プ、12・・・・・・ボイスコイル、13・・・・・・ダンパー。 Name of the agent
Attorney Nakao Toshio One other person Fig. 1 Screaming Ji 0--qb / f ヲ Z9 Fig. 4 Fig. 5 (it) (b)
(C) (i) ("only 2 Fig. 6 (0-) (I) Hiroshi qb
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