JPS53147723

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DESCRIPTION JPS53147723
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 3 are sectional views showing respective
embodiments of the speaker diaphragm according to the present invention, and FIG. 4 shows the
thickness of a disc made of an acrylic synthetic resin foam material. FIG. 5 is a graph showing the
influence of the expansion of the dome on the frequency characteristics of the sound pressure on
the front axis of the diaphragm. 1 · · · · Speaker diaphragm, 1a · · · · · · Flat sound emitting surface
for sound, 1b · · · · · · Thickness 1C · · · · · · · · · · · · · · · · · · ..... Airtight layer, 3 ..... Strong layer of 彎
surface. 2468101214 (mm)-lumber l (・ 7 full Ltt C each t Tonaku is α to
DETAILED DESCRIPTION OF THE INVENTION +1) J3 No. 23 This invention relates to the
improvement of a speaker diaphragm, and it extends a region in which the speaker diaphragm
integrally follows, that is, a piston movement region, and It is an object of the present invention
to expand the range in which the frequency characteristic of the sound earth on the front axis of
the above becomes flat. Conventionally, in general, the diaphragm of the welding /
disengagement type speaker is made of paper 1.. Resins, gold @-and the like are used as a base
material, and are formed in a cone shape or a dome shape. This cone-shaped 振 j 板 板 材質 材質
材質 材質 材質 材質 材質 材質 材質 材質 材質 材質 材質 材質 材質 材質 材質 材質 材質 材質 材質
・ ・ 到 到 到 到 到 到 到 到 到 到 ・ 到 到In the case of H, a region in which the vibration
surface locally causes different complex resonance, that is, a divided resonance region appears.
On the other hand, the dome-shaped diaphragm has a very thin and relatively rigid material (a
bending deformation occurs, and it has a very strong and sharp shape. However, when such a
dome-shaped MBm board is used, the threshold skill characteristic of the sound pressure
generated on the front surface is not flat unlike the flat circular vibration (2) i. As the depth of
the dome-shaped molding increases, the unevenness of the sound pressure characteristic of the
sound pressure becomes more pronounced. The frequency characteristic of the sound pressure
shown in FIG. 5 shows that, and the horizontal axis vCka is taken, the sound pressure is taken off
on the vertical axis, and the diaphragm is a flat disk of radius α, a, b The results of experiments
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are shown for the dome pillow plate of radius G where the depth of the dome-like formation is
large as in c, c, and the dome plate of the hemisphere of radius α. As well known, k is a
wavelength constant, and is = (11-'; 2xf-Qx [Hisao Hayasaka. OC λ Ishii Suzue, Yoshiyoshi
Akiyoshi, co-authors: Introduction to sound engineering (revised new version), November 30 B,
1959, published by The Nikkan Kogyo Shimbun, pages 166 and 167]. This invention is focused
on the fact that the frequency characteristics of the sound pressure on the front axis become the
most flat if the diaphragm moves with a flat vibration surface, that is, a flat sound pressure
radiation surface, and has a small mass, that is, a light material For example, a foam material
forms a diaphragm having a flat sound pressure radiation surface. However, since the bis (3) ton
movement area becomes extremely narrow with a flat plate, the flat sound pressure radiation
surface and the opposite port are made into a curved surface (dome shape) that becomes
extremely strong in terms of structure 7; Furthermore, if necessary, a gold layer or the like in
which the five curved surfaces are dome-shaped is added to provide a layer of high strength on
the curved surfaces, thereby expanding the piston movement region.
Still, when the material of the above-mentioned diaphragm is a foam material having airpermeable bubbles, a film of metal or resin is attached to a flat sound pressure radiation surface,
or a material which blocks air bubbles is applied, etc. According to the invention, an airtight layer
is provided, thereby making the flat sound pressure radiation surface smooth and rigid,
preventing the frequency characteristic of sound pressure from fluctuating, and also increasing
the sympathy same wave number. That is, this invention provides a speaker diaphragm which is
provided with the features of a flat plate having a flat sound pressure radiation surface and the
features of a dome-shaped diaphragm. FIG. 1 shows a first embodiment of the present invention,
wherein the sound pressure radiation surface 1a is flat, and the opposite P1 inclusion is the front
side 10 having a predetermined thickness lb, zJ), -,-(4) It is set as the speaker diaphragm 1 shape
¦ molded by the material with a high Young's modulus by an extraordinary mass. Note that
illustration and reflection of the first part of the speaker diaphragm is omitted. FIG. 2 shows a
second embodiment of the present invention, in which the sound pressure radiation surface 1a is
flat, and the opposite surface is a material of the speaker diaphragm l formed as a curved surface
lO having a predetermined thickness. In order to reduce its mass, it is used as a foam of # fat or
metal, and the flat sound pressure radiation surface 1 a is further provided with an airtight 12 to
close pores generated due to the foam. It is. The 1-2 may be added separately or may be
provided by various means for closing the pores of the flat surface of the foam itself, for example,
by applying a paint capable of preventing the pores. FIG. 3 shows a third embodiment of the
present invention, in which the second embodiment shown in FIG. There is +51 in the one where
the strong layer 3 is provided. As a specific example of the above-mentioned foam material, a lift
table having an expansion degree of 20 times and 10.045 t / − with an acrylic resin base will be
examined. FIG. 4 shows the measured values of the change of the primary resonant frequency
with respect to the thickness of the flat disk made of this foam, with the diameter of the flat disk
having a diameter of 56 mm and 38 + w, respectively. In the small thickness range with respect
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to the diameter, the thickness and the primary resonance 1 wave number are proportional, but as
the thickness increases, the integration of the primary resonance 1 wave number decreases. The
above shows the difficulty of obtaining a high resonant frequency with a flat thin disk. Next,
when the third actual case of this invention shown in the third factor is continued in more detail,
as an example where the strong layer 3 can be contained in the curved surface 10, an aluminum
eraser having a thickness of N50μ is formed into a dome shape This is done with acrylic wood
foam backing.
And the flat old pressure radiation surface 1a was made into a disk of diameter 56 ■, and the
depth of the dome was 12 m +. (6) As a result of experiments on the speaker diaphragm made in
this way, the primary resonance same wave number is 9 KHz, and in the same wave type range
below 9 KHz, the sound pressure on the front axis of the sound pressure radiation surface The
frequency characteristics achieved a flat without unevenness. As described above, this invention
provides a loudspeaker diaphragm in which the sound pressure radiation surface is flat and the
opposite surface is a curved surface having a predetermined thickness, using a very light and
high Young's modulus material. Since the acoustic radiation is equivalent to the vibration of a flat
disk, there is no unevenness in the number of waves for sound on the front axis like a domeshaped diaphragm, Very flat frequency characteristics can be realized. Moreover, since the
opposite surface of the flat sound pressure radiation surface is reinforced as a wedge surface in
the same manner as the dome-shaped diaphragm, the pigeon wave number range for piston
movement is close to the dome-shaped vibration wedge It is possible to obtain a loudspeaker
diaphragm (7) which can be expanded to a value and which has the features of a flat diaphragm
and a dome-shaped diaphragm.
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