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JPS54119341

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS54119341
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a diaphragm, and FIG. 2
is a perspective view of FIG. 1 when the diaphragm of FIG. 1 is attached. 3 is a magnified view of
part A of FIG. 2 when another diaphragm is attached, FIG. 4 is a perspective view of the other
diaphragm, and FIG. 5 is a vibration of FIG. 4 is a cross-sectional view taken along the line V-V of
FIG. 4 when the plate is attached, and FIG. 6 is an enlarged view of a portion B in FIG. 5 where
the diaphragm shown in FIG. It shows each. DESCRIPTION OF SYMBOLS 1 ... diaphragm, 2 ...
dome part, 3 ... edge part, 5 ... attachment piece, 6 ...-projection, I ... screw hole, 8 ... magnet, 9 ...
Upper plate, 12: Slow 1-tool, 13: Mounting screw.
DETAILED DESCRIPTION OF THE INVENTION As is well known in the art concerning the domeshaped metal diaphragm used for the diaphragm of the loudspeaker, in particular the horn
speaker, when attaching the diaphragm of the loudspeaker, the magnetic circuit and It is
extremely important that the center axis of the diaphragm be aligned so that the bobbin and the
voice coil are located at the center of the gap between the pole and the top plate, so that accurate
centering and attachment are achieved. If the loudspeaker is used in a state where it is not
centered or precise, distortion of the diaphragm increases to cause deterioration of the sound
quality, and when the deviation is further large, the bobbin or voice coil is around the air gap.
Contact with the pole or the top plate of the sensor to cause disconnection or failure.
Conventionally, when attaching a diaphragm in which metal foils are integrally pressed in a dome
shape to the upper flat of a magnetic circuit, screw holes or guide holes are provided around the
edge of the diaphragm and removed by screws in the upper plate (2 ) Was attached. However,
screw holes or guide holes are simply punched holes, and in particular in the case of thin metal
foils of several tens of microns, the cut-outs of the punched holes become weak and the cut-outs
As a result of expansion and deformation, it has a drawback that it can not be attached with
accurate centering. This invention was made in view of the above-mentioned circumstances, and
by forming a projection for positioning on the edge between the edge portions of the dome-
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shaped diaphragm, a precise installation can be positioned and held. Purpose is to provide the
diaphragm of the An embodiment of the present invention will be described below based on the
description of the drawings. In FIG. 1, the dome-shaped diaphragm l is entirely or integrally
pressed with a hard, light-weight metal foil such as duralumin foil or titanium foil, and the central
dome portion 2 and the outer periphery of the base portion of the dome portion 2 It has an edge
part 3f. The edge portion 3 is formed of the corrugation 4 on the inner periphery and the annular
attachment piece 5 on the outer periphery thereof (3). The attachment piece 5 alternately has a
plurality of hemispherical projections 6 and a plurality of screw holes 7 alternately. And at equal
intervals. When attaching such a diaphragm l, as shown in FIG. 2, it corresponds to the
protrusion 6 formed on the mounting piece 5 on the upper surface of the upper plate 9 fixed to
the upper part of the cylindrical D magnet 8 Recesses of an annular upper pressure plate 10
made of a somewhat hard material such as aluminum are fitted to the same number of convex
portions 9a provided in the respective positions, and then formed on the opposite surface of the
depressed portions of the upper pressure plate 10 The four parts of the inner surface of the
hemispherical protrusion 6 of the mounting piece 5 are respectively fitted into the protruding
portion 10a, and the upper pressing plate 11 is made of the same material and shape as the
upper pressing plate 10 from above. 0, and the concave portion of the throat tool 12 such as the
equalizer is fitted to the convex portion 11a of the same plate 11 respectively.
Top plate 10. Since screw holes (4) are respectively formed at positions corresponding to the
screw holes 7 of the respective mounting pieces 5 of the upper holding plate 11 and the throat
tool 12, these are all concentrically located at the top by the mounting screws 13 It is fixed to the
plate 9. As described above, according to the diaphragm l shown in FIG. 1, the four portions 1 of
the inner surface of the protrusion 6 are the convex portions 10a of the lower pressing plate lO.
The outer surface of the projection 6 is in close contact with the concave portion of the upper
pressing plate 11 and the position thereof is regulated, and the convex portion 9a of the upper
plate 9 is engaged with the concave portion of the first pressing plate lO. When fixed to the
upper plate 9 with the set screw 13 as specified, engagement with the projection 6 becomes
deeper as the screw 13 is tightened, and even if the position is slightly shifted at first, along the
hemispherical surface The slip is fixed in the correct position by sliding, so the deviation is
corrected naturally. Furthermore, when the screw is tightened, a force to rotate the diaphragm 1
is exerted to exert a force on the projection 6, but since the area in contact with the upper and
lower presser plate 10.11 on the projection 6 is large, the strength is also sufficient. There is no
distortion. In FIG. 3 (a), instead of forming the hemispherical projections 6 of the mounting piece
5 of the diaphragm 1 shown in FIG. 1, (5) a book in which the cylindrical projections 6 are
formed is used. 6A and 6B, cylindrical projections of the upper holding plate 10 ° mounting
piece 5 in order from the bottom to the guide rods 9b provided at positions corresponding to the
cylindrical projections 6 on the upper plate 9. The upper presser plate 11 and the throat tool 12
are respectively fitted, and FIG. 6 (b) shows the case where the guide rod 9b in (a) is fitted into
the hole 9c of the upper plate 9. As shown in FIG. In these cases, the inner peripheral surface of
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the projection 6 is still in close contact with the inner peripheral surface of the upper holding
plate 1] of the outer peripheral surface of the projection 6 by the kite rod 9b of the upper plate
9, and the position is restricted. Since the contact area of the guide rod 9b with the projection 6
and the upper pressure plate 11 is large and the projection 6 is restricted from the inside and the
outside of the projection 6, the projection 6 is strong and the screw 13 is tightened. FIG. 4 shows
an embodiment in which a plurality of tapered cylindrical projections 6 also serving as screw
holes are formed in the mounting piece 5 and has the mounting piece 5. When attaching the
diaphragm l, as shown in FIG. 5, the lower presser plate 10.2. Mounting piece 5. The upper
presser plate 11 and the throat tool 2 are placed in such a manner that their screw holes
coincide with each other, and fixed to the upper plate 9 by the mounting screws 13. In this
embodiment, the projection 6 doubles as a screw hole and the mounting screw 13 doubles as a
kite rod, and the upper inner peripheral surface of the projection 6 is the lower outer peripheral
surface by the outer peripheral surface of the mounting screw 13. For example, since the center
position is accurately determined by the inner peripheral surface of the screw hole of the upper
pressure plate 11, the projection 6 has a cylindrical shape whose diameter gradually decreases
from the rising portion toward the tip end. , Has a certain degree of elasticity.
Therefore, when the mounting screw 13 is tightened, it is corrected and fixed to the normal
position even if the position is slightly shifted. FIG. 6 shows the case where upper and lower
presser plates 1 + i and ll'i are omitted by forming the base 9c on the upper surface of the upper
plate 9 and the presser seat 12a on the lower surface of the throat tool 12. Is the same as
described above. In the above description, the case where the projection 6 is formed on the
surface of the attachment piece 5 on the dome (7) portion 2 side is exemplified, or the case
where the projection 6 is provided on the opposite side is also possible. Of course. In each figure,
14 is a pole and 15 is a bobbin. 16 shows a voice coil. In the diaphragm l of the loudspeaker
according to the present invention, as described above with reference to FIGS. 1 to 6, the
projection 6 is provided on the attachment piece 5 of the edge portion 3, and the inner and outer
surfaces of the projection 6 are At the same time, since it is a diaphragm of a dome-shaped
loudspeaker with integral pressing and forming of metal foil, which is positioned and centered by
closely squeezing closely, the exact center of the air gap of the magnetic circuit between the pole
14 and the upper plate 9 It is possible to concentrically attach the diaphragm 1 to the position,
and even if the position of the diaphragm l is slightly lowered at first, it can be corrected
naturally by tightening the mounting screw 13, and Since screw holes 7 and projections 6
necessary for centering of a metal foil diaphragm which is extremely thin can be reinforced
without distortion due to a twisting force at the time of tightening, it is possible to prevent
enlargement and deformation of the cut. Have various effects such as being able to (8) A.
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