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JPS5613896

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DESCRIPTION JPS5613896
Specification L Title of Invention
Speaker diaphragm
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
diaphragm, and more particularly to a loudspeaker diaphragm in a type of loudspeaker driven at
a position near the outer periphery thereof. As a tweeter for reproducing a high region, there has
been conventionally used one having a reproduction frequency of 25 KHz using a flat diaphragm
with a diameter of 20 tM. In the rounding to expand the reproduction band 'ft away, it is
necessary to cancel the 41st resonance mode of the plate-like vibration and to drive the outer
periphery of the diaphragm for that purpose, as shown in FIG. It has been proposed to drive the
node position of the primary resonance. In FIG. 1, a support made of a magnetic material is
provided with a center ball (2) protruding from the upper surface of the central portion of the flJ,
and is a ring permanent so as to collect the center pole (2) on its upper surface. A magnet (3) is
provided. (4) is a plate made of a magnetic material EndPage: 1 family disposed on the upper
surface of the permanent magnet (3), and forms a predetermined sky 11j (5) in the dark with the
center ball (2) Reference numeral 3 (6) is a heater provided in the Great Territories (4), which
supports the diaphragm (8) t-via an edge (7) t-. The voice coil αQ is accommodated on the
diaphragm (8) within @ t57. When the position where the node of the $ 1 primary resonance is
made short in this way, the inner diameter of the plate (4) and the outer diameter of the center
ball (2) become smaller, and the speaker drive magnetic circuit, especially the center ball The
magnetic saturation occurs in (2), the magnetic flux density in the sky 11i1i (5) is significantly
reduced, and the efficiency of the speaker is greatly reduced. Furthermore, in the method of
canceling the first resonance in this way, there is 5J capability that the first coincidence mode is
easily generated due to the variation of the position of 躯 wh 都. In addition, since the tweeter is
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low in input resistance, if the efficiency is low, the performance of the system is significantly
reduced. An object of the present invention is to provide a wide band, low distortion speaker
diaphragm which does not cause such a problem, and an embodiment thereof will be described
below with reference to FIGS. In FIG. 2, (6) is a support, (2) is a center ball, (permanent) is a
permanent magnet, α4Fi great, (perspective is empty), tm is a frame, @ is an edge, Qal is a
diaphragm, ( 11 is a coil bobbin suspended from the vicinity of the outer periphery of the
diaphragm (G), (E) is a voice coil, the outer diameter of the center ball 4, the inner diameter of the
plate .alpha. The configuration of (G) is the same as that of FIG. 1 except that the mounting
positions of the coil bobbin () and the voice coil (E) to the diaphragm (G) are different.
According to such a configuration, since the diameter of the center ball @ is larger than that in
the case of FIG. 1, magnetic saturation can be prevented, and therefore, the efficiency of the
speaker can be prevented from being reduced. Can be expanded. Next, the configuration of the
diaphragm (g) will be described with reference to FIG. FIG. 8 shows a conventional diaphragm (8)
for comparison, in which a pair of flat face materials (8a) and (8b) are disposed facing each other
with a gap therebetween, and interposed between these face materials. -It was a plate-like one
consisting of a necum structure (8C). On the other hand, the $ 4 diaphragm has a flat plate-like
face that forms a sound pressure radiation surface, a driving-side curved plate-like face material
@ that faces the gap at a distance, and these The thickness increases from the central portion
interposed between the face materials toward the outer peripheral side, · · · formed from the cam
structure-, and as a whole, the thickness increases from the central portion to the outer
peripheral side, A more specific structural example of the diaphragm (d) will be described with
reference to FIGS. 5 to 7). In the diaphragm (18a) of FIG. 5, the face material (22 m) on the drive
side is conical. It consists of a curved plate, and the thickness of the diaphragm (18a) increases
from the central portion to the outer periphery as a linear function, and in the diaphragm (18b)
of FIG. 6, the face material + 22b on the drive side is released. Object plate and the thickness of
the diaphragm (18b) is secondary from the center to the outer periphery In the diaphragm (180)
of FIG. 7, the face material (22 (+) of the U-drive eilJ is formed of a hyperboloid plate and the
thickness of the diaphragm (180J is from the central portion to the outer peripheral side)
Towards hyperbolic function increases. FIG. 8 shows another specific example of FIG. 4. In this
embodiment, not only the thickness of the diaphragm (1 昶) gold body increases from the central
portion toward the outer periphery, but also the face material Also, by increasing the thickness of
+2111 (22d) from the central portion toward the outer peripheral side, the cross density of each
part of the diaphragm [z8a) is made constant. The result of analyzing how the reproduction zone
changes with the shape of the diaphragm (8 Jo 8 is shown in FIG. 9). That is, FIG. 9 shows the
results of simulation with the vibration analysis program NAEITRAN for the case where the outer
periphery is driven as shown in FIG. 8 and the specific examples of FIGS. 5 to 7, and the aperture
is 20 m1s as a condition. The dimensions and shape as shown in FIG. As is apparent from the
figure, the diaphragm has a flat plate-like shape, the thickness linearly increases from the central
portion toward the outer periphery, the thickness increases quadratically, the thickness in
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hyperbolic chest The characteristics are successively improved in the hope that the
As is apparent from the above description, according to the one embodiment of the present
invention, since the thickness is increased from the central portion toward the outer peripheral
side, EndPage: 2〃 · ら reproduction is not performed near the outer periphery. The bandwidth
can be expanded, so that the efficiency is high, the performance is high, and the reproduction
bandwidth can be expanded to obtain a loudspeaker. Figure 1 is a vertical cross-sectional view of
a conventional speaker, a simple explanation of the rice drawing! ? ! FIG. 2 is a longitudinal
sectional view of a speaker showing an embodiment of the present invention, and FIGS. 8 to 8
show speaker diaphragms. FIG. 8 is a longitudinal sectional view of a conventional example, and
91% 4 is the invention FIG. 9 is a longitudinal sectional view showing the structure of an
embodiment according to FIG. 5, FIG. 8 to FIG. 8 a longitudinal sectional view of a specific
embodiment of FIG. Qll-support @-center post, μs ... permanent magnet, α4-blade, (d)-· air gap,
(7) · · diaphragm, 翰 ... voice coil, a (21a) to (21 + 1) -Face material which forms a phonon
radiation surface, c12 (22 &)-(221)-Face material on the drive side,---Ha-Konbo cam structure
agent Morimoto-Hiroshi Fig. 1 / Fig. 2 J7? fflEndPage: 3
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