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JPS58200696

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DESCRIPTION JPS58200696
[0001]
According to the present invention, the driving force of the voice coil is applied to a position
where the rectangular diaphragm having the outer peripheral portion supported by the frame via
the edge member is eccentric to one of center and center in the long side direction of the
rectangular diaphragm. More specifically, it is an object of the present invention to provide an
electrodynamic speaker capable of preventing a rolling phenomenon in which only the voice coil
driving portion of a rectangular diaphragm vibrates largely. is there. Generally, the shape of the
speaker diaphragm is mostly of the original type, and the shape of the speaker becomes a
problem as the audio equipment such as a television receiver for voice multiplexing and a
cassette tape recorder with a radio receiver is made compact. ing. Therefore, since most of the
audio equipment in which the scyca is stored is a rectangular parallelepiped, a speaker having a
rectangular diaphragm has been developed. A speaker having this rectangular diaphragm has
many voice coil components by making the voice coil position eccentric to the central part in the
long side direction of the rectangular diaphragm and moving the magnetic circuit that comes to
the back of the speaker to the end of the frame. This is advantageous for improving the
component storage rate of audio equipment such as a tape recorder with a radio receiver and for
achieving compactness of the audio equipment. 1 and 2 show a conventional electrodynamic
loudspeaker having a rectangular diaphragm. In FIGS. 1 and 2, 7 is a yoke integrally formed with
the center ball 9, 6 is an annular magnet fixed on the yoke 7, 6 is an annular plate fixed on the
magnet 6, An annular magnetic gap is formed between the inner circumferential surface of the
plate 6 and the outer circumferential surface of the center ball 9. The magnetic circuit is fixed to
the bottom of the rectangular frame 1o. Reference numeral 1 denotes a rectangular flat
diaphragm, which is supported by the edge member 2 at the opening of the frame 1o. A coil
bobbin 3 is coupled to a position decentered from the central portion in the long side direction of
the rectangular flat diaphragm 1, the voice coil 8 is wound around the coil bobbin 3, and the
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voice coil 8 is inserted into the magnetic gap. ing. , 4 is a damper for supporting the voice coil
bobbin 3 on the frame 1 o. The radiuses of the four corner portions of the edge member 2 are R1
and R2 = Rs = R4 and R + '2 R2' = R5 '= R4'. However, with the dynamic speakers mentioned
above. When the driving force F by the voice coil 8 is added to the rectangular flat diaphragm
1Vc in the low range, the vibration mode shown in FIG. 3 is adopted.
That is, as described above, since the radiuses of the four corner portions of the edge member 2
are equal, the stiffness of the two opposing sides of the edge member 20 is equal. So Ella? The
stiffness of both ends of the member 2 is + 2 and 2 is Kl = 2 and driven by the driving force of
the voice coil 8 coupled to a position eccentric by a distance l from the center of the rectangular
flat diaphragm 1 in the long side direction In this case, as shown by the broken line, a
phenomenon in which only the coupling side of the voice coil 8 vibrates greatly, that is, abnormal
noise generated by rolling and the voice coil 8 coming into contact with the magnetic gap or
breakage of the voice coil 8 It had become. The present invention overcomes the abovementioned conventional drawbacks and is far from the voice coil coupling position as compared
with the diameter of the two corner parts near the voice coil coupling position among the four
corner parts of the working / gee member. By setting the diameters of the two corner portions
large, it is difficult to cause rolling in the low-pitch range, and the component storage rate of the
acoustic device can be improved. To provide an eccentrically driven rectangular speaker capable
of Hereinafter, the present invention will be described with reference to the drawings of the
embodiments. FIGS. 4 and 5 show an embodiment of the present invention. In FIGS. 4 and 6, the
same reference numerals as in the prior art denote the same parts as in the prior art. Of the four
corner portions of the edge member 2 whose cross section is a roll in this embodiment, the
diameters of the two corner portions near the voice coil coupling position are R3 2 R 4 and R 2 R
4 'while the voice coil The two opposite corner portions far from the coupling position are also
R1 = R2 and R1 '-R2', but the voice coil coupling position as R1 2 R2) R5 = R4 2 'R +' = R2 '> Rs' =
R4' Make the diameter of the corner part on the further side larger. In the case of the edge
member 2 for a rectangular diaphragm, since the short side and the long side cross at right
angles at a part of the corner, distortion is concentrated, which is a major factor in determining
the stiffness of the edge member 2. That is, the larger the diameter of a part of the corner, the
more the strain is dispersed and the support can be easily moved. When the position of the voice
coil 8 is decentered to drive the rectangular flat diaphragm 1, as in the conventional example, the
diameter of each corner portion is equal. That is, when the stiffness is equal, the force is largely
applied to a part of the corner near the voice coil 8 and the dog pitch is as described above, but
in this embodiment, the voice coil side with small corner diameter is stiff Because it is large, it
becomes hard to move hard, and it becomes easy to move softly because it has a large diameter
on the far side.
Therefore, it becomes iJ ability to make the side far from the voice coil 8 have almost the same
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amplitude as the side close to the voice coil 8 with respect to the eccentric driving force, and it is
possible to significantly improve the low-pass rolling. FIG. 6 shows another embodiment of the
present invention. In FIGS. 6 and 7, although the cross-sectional shape of the edge member 12 is
a corrugated shape, the same applies if the diameter of each corner portion is taken in the same
manner as in the previous embodiment. An effect can be expected. Also, as shown in FIGS. 8 and
9, although the edge member 12 is the same as that of the second embodiment, it is possible to
change the diaphragm from a planar shape to a rectangular cone diaphragm 11 as well. In the
case of a moving plate, the weight of the diaphragm is heavy due to the sandwich structure
generally consisting of a surface material and a core material, and the efficiency is lower
compared to the conventional nocone speaker. It is possible to improve the efficiency by
reducing the weight of the diaphragm by the cone. As described above, according to the present
invention, according to the present invention, an edge member in which the diameter of the
corner portion far from the voice coil driving position is set dog-like compared with the
diameters of the two corner portions near the voice coil driving position of the rectangular
diaphragm. Since the outer peripheral portion of the rectangular diaphragm is supported by the
frame at this time, the stiffness at the opposing portion of the J-shaped portion is made
asymmetric to make it difficult to cause the low range rolling phenomenon when the voice coil
drive unit is asymmetric. Have the advantage of being able to
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a top view of a conventional electrodynamic speaker, FIG. 2 is a cross-sectional view of
the same speaker, FIG. 3 is an explanatory view of low-frequency rolling of the same speaker, and
FIG. 5 is a plan view of the main part of the same speaker, FIG. 6 is a top view of another example
of the same speaker, and FIG. 7 is a plan view of the main part of the same speaker, FIG. FIG. 9 is
a plan view of still another embodiment of the same speaker, and FIG. 9 is a plan view of an
essential part of the same speaker.
1 ...... rectangular flat diaphragm, 2 ...... edge member, 3 ...... coil bobbin, 8 ...... voice coil, 11 ......
rectangular cone Diaphragm, 12 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · name of the agent Patent
Attorney Toshio Nakao Other 1 person Figure 1 Figure 2 Figure 3 Figure 4
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