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DESCRIPTION JPH0338998

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DESCRIPTION JPH0338998
[0001]
FIELD OF THE INVENTION The present invention relates to a loudspeaker intended to improve
the sharp peaks generated by the dust cap at the high frequency limit, and relates to a
loudspeaker using a circular dome shaped dust cap. Prior Art In recent years, among the
improvements in the characteristics of the speaker device, the E / P of the material to be formed,
that is, the Young's modulus and the like of not only the diaphragm but also the dust cap are
intended The rigidity is improved focusing on the density ratio. Hereinafter, the conventional
speaker as described above will be described with reference to the drawings. FIG. 3 shows the
structure of a conventional speaker. In FIG. 3, a voice coil 6 supported by a damper 5 is inserted
at the center of the gap of the field formed by the plate 1, the magnet 2 and the upper plate 3,
and a diaphragm 7 is joined to the top of the voice coil 6. The diaphragm 7 is coupled to the
peripheral edge of the frame 4 coupled to the field portion via an edge 8. A high rigidity dust cap
9 is joined to the center of the diaphragm 7. The operation of the loudspeaker configured as
described above will be described below. When an input voltage is applied to the voice coil 6 in
the magnetic gap, a driving force is generated to vibrate the diaphragm 7 and the dust cap 9.
Problems to be Solved by the Invention However, the above-mentioned configuration has the
following problems. That is, when the frequency component of the input signal is low, the dust
cap 9 has sufficient hardness to hold the shape, but when it is in the high frequency region, the
shape can not be held, and the sound pressure frequency characteristic is high. In the range, a
sharp peak (high frequency reproduction limit frequency: fn) as shown in FIG. 4 is generated. As
shown in FIG. 5, the vibration state at this high-frequency reproduction limit frequency in is
axisymmetrical in shape of the dust cap 9, so that the node 10 which does not vibrate becomes
circular, the natural resonance frequency becomes constant and a peak occurs. Do. The present
invention solves the above-mentioned conventional problems, and provides a speaker having a
sound pressure frequency characteristic that is smooth to high frequencies. Means for Solving
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the Problem In order to solve the problem, in the speaker of the present invention, the apex of
the dust cap is at a position different from the center of the dust cap, and the distance from the
apex to the outer periphery of the dust cap is a position The non-axisymmetric dust cap is used.
Operation With this configuration, the natural vibration frequency of the non-axisymmetric dust
cap is low in the direction in which the distance from the top of the dust cap to the outer
periphery of the dust cap is long and high in the short direction.
Accordingly, the directions have various natural vibration frequencies, and sharp peaks are
dispersed to realize smooth sound pressure frequency characteristics. EXAMPLES Examples of
the present invention will be described with reference to the drawings. FIG. 1 shows a speaker
according to an embodiment of the present invention, and FIG. 2 shows a dust cap used for the
speaker. In FIG. 1, 11 is a plate having a center ball, 12 is a ring-shaped magnet, and 13 is a ringshaped upper plate, which form a field section. A frame 14 is coupled to the field portion, and a
diaphragm 17 is coupled to a peripheral portion of the frame 14 via an edge 18, and a voice coil
16 is coupled to a central portion of the diaphragm 17. The intermediate portion of the coil 16 is
held by the damper 15 and fitted into the magnetic gap of the field portion without eccentricity.
Further, a dust cap 19 whose apex 20 is at a position different from the center is connected to
the upper surface of the central portion of the diaphragm 17 to constitute a speaker. FIG. 2 is a
top view of the dust cap 19 showing that the distance from the apex 20 to the outer periphery of
the dust cap differs depending on the position (direction). The operation of the loudspeaker
configured as described above will be described below. First, the method of causing the driving
force to vibrate the diaphragm 17 and the dust cap 19 is the same as that described in the
conventional example. Therefore, at low frequencies, it is possible to maintain the shape and
obtain smooth sound pressure frequency characteristics. When the frequency becomes high,
nodes are generated in the direction of a long distance from the top 20 of the dust cap 19 to the
outer periphery of the dust cap 19 but no sharp peak or dip is generated because it is not
axisymmetric. When the frequency further increases, the nodes sequentially move in the
direction in which the distance from the top of the dust cap 19 to the outer periphery of the dust
cap is short, causing split resonance, and no peak at a specific frequency is generated. As
described above, according to the present embodiment, the speaker 20 has the non-axisymmetric
dust cap 19 whose apex 20 of the dust cap 19 is different from the center of the dust cap 19,
and uses the non-axisymmetric dust cap 19. By this, the sharp peak seen in the upper limit of the
sound pressure frequency characteristic is divided, and a smooth sound pressure frequency
characteristic can be obtained. The apex 20 of the dust cap 19 according to the present invention
can obtain the effect if it is slightly different from the dust cap center, and in the outer peripheral
direction, the practical range is 95% from the dust cap center.
As described above, according to the present invention, the apex of the dust cap is different from
the center of the dust cap, and the distance from the apex to the outer periphery of the dust cap
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is different depending on the position (direction). It is possible to realize an excellent speaker
capable of obtaining a smooth sound pressure frequency characteristic by dividing a sharp peak
found in a high frequency limit of the sound pressure frequency characteristic.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a speaker according to an embodiment of the present invention, FIG.
2 is a top view of a dust cap used for the speaker from above, FIG. 3 is a cross-sectional view of a
conventional speaker, and FIG. FIG. 6 is a sound pressure frequency characteristic diagram of the
conventional speaker, and FIG. 6 is a vibration state diagram of the high limit frequency fn of the
same speaker.
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