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JPS6116697

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DESCRIPTION JPS6116697
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker used in various electroacoustic devices, and more specifically to a
rectangular flat diaphragm. (Constitution of the prior art and its problems) A conventional
rectangular flat diaphragm will be described with reference to FIGS. 1 to 3. FIG. In FIG. 1, a
rectangular flat diaphragm 1 is a diaphragm having a three-layer structure in which flat skins 3
and 4 are bonded to both sides of a core 2. In FIG. 2, this figure shows a diagonal cross section of
the diaphragm 1 in which the rectangular flat diaphragm 1-is connected to the frame 6 of the
speaker via the edge 5. The state in which the edge 5 is adhere | attached on the periphery of the
lower skin material 3 is shown. When the speaker having such a structure operates and the
rectangular flat diaphragm 1 vibrates in the vertical direction, a tensile stress is generated at the
edge 5 and the core material ° is obtained when the displacement of the diaphragm 1 is
downward. When the displacement of the diaphragm 1 is in the upper direction so as to pressbond the force, each force acts so as to separate the skin material 3 from the core material 2. FIG.
3 shows the above-mentioned upward displacement. A model of the tensile force of the edge 5
generated at the four corners of the rectangular flat diaphragm 1 and the peel resistance of the
skin material 3 is shown. Curve A represents the center a of one side of the rectangular flat
diaphragm. The curve B is the peeling resistance at that time, and the tensile force from the
corner to the center C of the adjacent side. Under the influence of the two sides sandwiching the
diaphragm at the corner of the diaphragm, the tensile force rapidly increases and exhibits a peak,
and the peel resistance shows a sharp decrease and a sharp valley. When a large output
continues for a long time, the tensile force exceeds the fatigue limit of the peel resistance, peeling
occurs at the four corners, and an abnormal sound is emitted, etc.). there were. (Object of the
Invention) The present invention solves the above-mentioned drawbacks, and reduces the peak of
the tensile force generated at the four corners of the plate-like diaphragm from the rectangular
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1
shape, and improves the peel resistance and separates the four corners. It is an object of the
present invention to provide a rectangular flat diaphragm in which In order to achieve the above
object, the present invention is configured as follows. In order to reduce the tensile force of the
edge at the corners of the rectangular flat diaphragm, the combined peak value is lowered by
making the direction of tension an obtuse angle from 90 ′ ′. For that purpose, the corner of
the bonding corner between the edge and the skin material is lowered to 456, leaving a triangle
that does not bond. In order to increase the peel resistance of the skin material at the corners of
the rectangular flat diaphragm, the triangle portion of the skin material left unbonded to the
edges at the four corners of the rectangular flat diaphragm is bent toward the core material.
As a result, the shear stress generated in the adhesive of the triangular portion is utilized to
enable significant enhancement of the peel resistance. The rectangular flat diaphragm according
to the present invention will be described with reference to FIGS. 4 to 6. FIG. In FIG. 4, the
rectangular flat diaphragm 7 according to an embodiment of the present invention is a square
with a side length of 120 + IIII, a flat plate skin material 4 on the lower surface and an apex
perpendicular to the four corners on the upper surface. Is a three-layer diaphragm in which a flat
skin material 9 is bonded so as to form a triangle 8 having a height Q of 2 to 3 m ++. FIG. 5
schematically shows the tensile force of the edge 5 generated at the corner of the rectangular flat
diaphragm thus constructed and the peel resistance of the skin material, and the curve C
represents the rectangular flat diaphragm. The curve of the tensile force from the center d of one
side to the center g of the next side through the contacts e and f with the triangle at one corner is
the peel resistance at that time. The tensile force decreases its peak value by making the corner
angle from 90 ° to an obtuse angle of i35 ', and the peel resistance changes from a decrease to
an increase by the adhesion of the triangular portion. In FIG. 6, this figure shows a diagonal cross
section of the diaphragm 7 in which the rectangular flat diaphragm 7 according to the present
invention is joined to the frame 6 of the speaker via the edge 5; An edge 5 is shown adhered to
the periphery of the skin material 9 so as to leave a triangle 8 formed at four corners 7. (Effects
of the Invention) As described above, according to the present invention, according to the present
invention, since a large peeling force does not act at corners of the skin material, the skin
material peels sufficiently to withstand long-term operation due to high output Thus, it becomes
possible to obtain a rectangular flat diaphragm without any noise, and to obtain a speaker for HiFi reproduction without any abnormal sound.
[0002]
Brief description of the drawings
[0003]
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2
1 is a perspective view of a conventional rectangular flat diaphragm, FIG. 2 is a cross-sectional
view of a main part of a speaker using the same diaphragm, and FIG. 3 is a state diagram
showing the distribution of stress acting on the diaphragm, 4 is a perspective view of a
rectangular flat diaphragm in an embodiment of the present invention, FIG. 5 is a distribution
diagram of stress acting on the rectangular flat diaphragm of FIG. 4, and FIG. 6 is a diaphragm of
FIG. It is principal part sectional drawing of the used speaker.
1.7 ... rectangular flat diaphragm, 2 ... core material, 3.4.9 ... skin material, 5 ... edge, 6 ... speaker
frame, 8 ... triangular surface. A, C: tensile force curve, B, D: peel resistance curve, Q: height of
triangle. Patent Applicant Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2 Figure 3
Figure 4 Figure 5 Figure 6 A
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