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JPS5743694

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DESCRIPTION JPS5743694
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1a is a top view of the main part of a conventional
dynamic loudspeaker using a circular plate diaphragm, FIG. 1 is a side sectional view of the same,
and FIG. Fig. 4 is a side sectional view of the main part of the prior art, Fig. 2 and Fig. 3 are
respectively a perspective view of the main part of an electrodynamic type Spinica using a
conventional rectangular flat diaphragm, and Fig. 4a is an embodiment of the present invention.
4 is a side view, FIG. 4C is a perspective view of a driver plate of the dynamic speaker, and FIG.
5A is another embodiment of the present invention. 5 is a side view, FIG. 5C is a perspective view
of a driver plate of the dynamic type speaker, and FIG. 6A is a main portion of still another
embodiment of the present invention. Fig. 6C is a side view, Fig. 6C is a perspective view of a
driver plate of the dynamic type speaker, Fig. 7a is a top view of a main part of still another
embodiment of the present invention, Figure 7 is the same side Figure, FIG. 7 C is a perspective
view of a tubular driver Dodo electrostatic speaker. 1 '...... rectangular flat diaphragm, 11.12 ......
clause line, 14.14' ...... driver plate, 15.15 '...... coil bobbin, 16.16 '..... voice coil. 17.17 '· · · · · · · · ·
Driver plate, 18. 18' · · · · · · · · · · Driver plate, 19 · · · cylindrical driver, 20 ° 20 ', 21.・ ・ Side
plate.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodynamic
Spy-2 coca using a rectangular flat diaphragm, suppressing low-order divided vibration modes of
the rectangular flat diaphragm and expanding the frequency band of piston movement. The
purpose is to FIGS. 1a, 1b and 1c show the main parts of a conventional dynamic loudspeaker
using a circular flat diaphragm. In FIG. 1 a, b and c +, 1 indicates a circular flat diaphragm. When
the central portion of the circular flat diaphragm 1 is driven by 1, the circular joint circle 2 is
generated at the first resonance frequency as shown by a broken line in FIG. In a speaker using
such a circular flat diaphragm 1, a sound pressure peak occurs at the first resonance frequency
in the sound pressure frequency characteristic, and the frequency band of piston movement
becomes narrow. However, as shown in FIG. 1, the upper end of the cylindrical coil bobbin 3
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1
having the same diameter as the nodal circle 2 generated in the single circular diaphragm 1 is
fixed inside the circular diaphragm 10, and this nodal portion To drive. The first divided vibration
mode disappears, and the frequency band of piston movement is expanded to the frequency at
which the second divided loss and dynamic mode occur. A voice coil 4 is wound around a coil
bobbin 3. The voice 4 coil 4 is disposed at a magnetic gap of the magnetic circuit / Q. Further, as
shown in FIG. 1C, the large diameter end of a truncated cone-shaped cylinder (referred to as a
drive cone) 5 is fixed inside the cylinder of the circular flat diaphragm 1, and the small diameter
end of the drive cone 5 is a cylinder. The first divided imaging mode can be canceled even if the
nodal portion of the circular plate diaphragm 1 is driven through the drive cone 5 by fixing the
coil bobbin 3 of It can be expanded. However, in the case of a non-circular flat diaphragm 1 such
as a square or rectangular rectangular lithographic diaphragm. The nodes of the divided
vibration do not become circular, and nodes close to a rectangle are generated. FIG. 2 shows the
main part of a conventional speaker using a rectangular flat diaphragm. In FIG. 2, 6 is a
rectangular root vibration diaphragm, Y is a rectangular coil bobbin having the same shape as a
rectangular node produced on the rectangular flat diaphragm 6, 8 is a voice coil wound around
the rectangular coil bobbin 7, and thus When driving the nodes by fixing the rectangular coil
bobbin 7 to the nodes 5 of the rectangle, the first divided vibration mode of the rectangular flat
plate diaphragm 6 can be eliminated or the magnetic circuit must be made rectangular. In
addition, there is a disadvantage that the manufacture of a magnetic circuit, a voice coil, etc.
becomes difficult and it is not practical. Conventionally, as shown in FIG. 3, the coil bobbins 10,
11.12 and 13 are fixed to the corners of the rectangular nodes 904 of the rectangular flat plate
diaphragm 6, respectively. There is also an electrodynamic speaker that drives a large number of
coil bobbins and magnetic circuits, so the number of parts increases and the structure becomes
complicated.
In the case of using a particularly small rectangular flat diaphragm, a small coil bobbin and
magnetic circuit must be used, which is substantially impossible. The present invention
eliminates the above-mentioned conventional drawbacks. Examples of the present invention will
be described below. Embodiment 1 In FIGS. 4a, 4b and 4c, 1 'is a rectangular flat diaphragm
having a ratio of a long side to a short side of about 2 = 1, and the first order of this 6
rectangular flat diaphragm 1'. The resonant mode is shown in FIG. This is the mode in which β2
occurs. This node line λ1. λ2 is a linear node parallel to the short side and curved at the center.
In FIG. 4, 14.14 'is a driver plate, and the shape of this driver plate 14, 14'. As shown in FIG. 4C,
the node line 11. Similar to β2, the central portion is curved, and the upper end portions of the
driver plates 14 and 14 'are fixed to the node lines 121 and 112 of the rectangular plate
diaphragm 1'. Reference numerals 15 and 16 'denote lower end portions of the driver plates 14
and 14' (C-fixed cylindrical coil bobbins, and voice coils 16 and 16 'are wound around the coil
bobbins 15 and 15'. The diaphragm 1 'is supported by the frame via an edge member, and the
coil bobbins 15, 16' are still supported by dampers, and the voice coils 16, 16 'are disposed in
the magnetic gap of the magnetic circuit. In the present embodiment, nodal lines 21. Since the β
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2 is driven by the driver plates 14 and 14 ′, the frequency band of motion 7 and motion is
expanded. Further, in this embodiment, since a normal coil bobbin and a magnetic circuit can be
used, the structure is simple and the cost becomes low. Embodiment 2 In FIGS. 11. A fan-shaped
driver plate, the center of the driver plate 17 ° 17 'is a nodal line 11. It is curved like R2. The
upper end portions of the driver plates 17 and 17 ′ are fixed to the node line portions of the
rectangular flat plate diaphragm 1 ′, and the lower end portions are fixed to the upper portion
of one coil bobbin 15. According to this embodiment, the frequency band of motion movement is
expanded to drive the nodal line. Further, in the present embodiment, in particular, since the
driver plates 17 and 17 'are coupled to one coil bobbin 15, one magnetic circuit may be used,
and the structure is simple and inexpensive. Embodiment 3 In FIGS. 6a, 6b and 6c, 1 'is a
rectangular flat diaphragm having a ratio of a long side to a short side of about 2.6. When the
ratio γ of is greater than 2, the joint lines R1 and R2 become substantially straight.
Reference numerals 18 and 18 'denote flat fan-shaped driver plates. The straight upper end
portions of the driver plates 18 and 18' are straight node lines n 1.41! Of the rectangular flat
plate 1 '! Fixed to 2 parts. The lower end is fixed to the coil bobbin 16. Embodiment 4 In FIGS. 7a,
7b and 7c, 19 is a plate-like body, and a pair of opposing side plates 20, 20 'are parallel. The
other pair of opposing side plates 21 and 21 'is a curved cylindrical driver, and the upper end
portion of the side plates 20 and 20' of the cylindrical driver 19 is: a broken line portion of the
rectangular flat plate moving plate 1 ' The coil bobbins 15, 15 'are fixed to the lower ends of the
side plates 20, 20'. The present invention is configured as described above, and according to the
present invention, the following effects can be obtained. (1) Driver plate Since a rectangular flat
diaphragm is driven via a cylindrical driver, it is possible to use a small-sized, cylindrical,
ordinary coil bobbin. The low-order divided vibration mode can be extinguished to drive the node
1 by using a driver plate and a cylindrical driver along the two-node shape, and the frequency
band of the motion of the morn can be expanded. In the diaphragm in which the ratio of the long
side to the short side is greater than 2, one node is almost linear, so that the driver plate can be
formed of a flat plate.
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