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JPS56152485

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS56152485
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an unexpanded
honeycomb block, FIG. 2 is an enlarged top view of the same parts, FIG. 3 is a perspective view of
an unexpanded honeycomb block for one diaphragm, FIG. Fig. 5 is a top view in the process of
expanding the honeycomb material, Fig. 6 is a top view of a part of the expanded honeycomb
core material, and Fig. 7 is the sound of the speaker using the diaphragm of the prior art and the
present invention. It is a pressure frequency characteristic view. 6 ииииии Honeycomb core material.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an imaging plate
for a speaker in which a surface material is adhered to the surface of a honeycomb core, and to
provide a diaphragm for a speaker having a small sound pressure beak at a coincidence
frequency. It is ideal that the imaging plate for 3 speakers performs a complete piston movement
in the operating frequency range, and if the vibration beam 7 (24?2 plate is deformed or split
pulsing occurs during imaging), the sound pressure frequency characteristics, distortion factor
(1) The phase etc. is degraded and high fidelity reproduction can not be expected. In order to
solve these problems, diaphragms using a honeycomb sandwich structure or the like have
recently been adopted. As a result, the piston motion frequency band is expanded, the sound
pressure frequency characteristic is flat, and a speaker with a low distortion rate and a good
phase frequency characteristic due to the fact that the pregnancy moving surface is a plane is
obtained. In order to expand the piston area, it is necessary to form the diaphragm with a
material having a large specific elastic modulus and to have a high bending rigidity. In order to
achieve this purpose, the thickness of the peristaltic plate is simply increased, and the efficiency
of the speaker as a whole is reduced even if it is made of a material with high density, so a light
weight, high rigidity honeycomb sandwich structure is incorporated. ing. A conventional
diaphragm of this type of honeycomb sand inch structure uses a foil for gold such as aluminum.
Fig. 7 shows the prior art 0 "" "material" not expanded 7 ". ) Is shown. This honeycomb-like
material 1 is obtained by laminating metal foils 2 such as aluminum and titanium which are light
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and stiff as shown in FIG. 2 'and bonding the necessary portions of adjacent metal foils 2 with an
adhesive 3 It is. When the core material is formed of this honeycomb-like material, as shown by a
broken line in FIG. FIG. 3 shows the unexpanded block 4 corresponding to one diaphragm that
has been cut. As shown in FIG. 4, this unexpanded block 4 is expanded to one end of the
unexpanded block 4 ([1a is at the center, b / force direction disk shape is expanded, and the
expanded is shown in FIG. Through the process, a disc-shaped core material is formed, and a
circular surface material such as aluminum is adhered to the surface and the back surface of the
core material to complete a speaker diaphragm. FIG. 6 is a top view of a part of the core material
6 formed by expanding the unexpanded block. However, the above-mentioned conventional
speaker diaphragms use foils of gold such as aluminum as a core material, and these gold plated
foils have extremely small mechanical internal loss (by the imaging lead measurement method).
The internal loss of the ram is 0.008), so the internal loss of the structure is small, and the width
at resonance frequency is large.
Therefore, when a conventional diaphragm is incorporated into a speaker, the peak of ih on the
sound pressure frequency characteristic is extremely large as compared with the conventional
paper cone paper. This peak is internal to the speaker system design, and the usable band is
limited by the size of the resonant peak and the resonant frequency. For example, in a mid-tone
speaker having a resonance peak of 1 odB at 10 KHz, the usable high frequency limit drops to 5
to 6 KHz. From these facts, it is considered as the theory of the diaphragm to lower only the
resonance peak without lowering the resonance frequency. However, conventionally, the method
of increasing the rigidity of the diaphragm to bring the resonance peak to a high frequency has
been adopted, and there have been few cases where the method of reducing the resonance peak
has been adopted. Also, as a method of suppressing the resonance peak, a damping layer having
a large internal loss is provided between the surface material and the core material to allow the
imaging plate to have an internal loss, but instead of reducing the resonance peak, The drop was
also significant, relatively less the ? N effect. The present invention is intended to eliminate the
above-mentioned conventional defects, and to provide a diaphragm for a speaker capable of
suppressing the five resonance peaks and minimizing the decrease in the resonance frequency.
An example will be described. EXAMPLE 3 An adhesive is applied in a pattern using a high
change paper (internal loss O, OS) having a thickness of 3 o ?m containing a phenol resin of
about 201) as a core material and laminated and bonded to form a honeycomb core. Next, this
honeycomb core was cut into a thickness of 3 + ++ m, and this was expanded to form an 8 o?
diaphragm core. An aluminum foil (thickness 20 ?m) is bonded to this as a surface material to
form a diaphragm. FIG. 7 shows the sound pressure frequency characteristics of the speaker
using the diaphragm of this embodiment in comparison with the conventional example (the core
material 9 is made of aluminum foil (20 ?m)). In addition, d is this invention, b is a prior art
example. As apparent from FIG. 7, it can be seen that the diaphragm of the present invention has
a lower value of 11 in fH, compared with the conventional diaphragm made of only aluminum, as
shown in FIG. Further, the weight according to the present invention is 1.75 y, and -1 is 2.35 jl in
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the conventional example, so that it can be reduced by about 25 and it is 6 and it is also
advantageous in terms of efficiency. In the above embodiment, high conversion paper is used as
the core material, but various types of FRP (fiber reinforced plastic), such as epoxy film mixed
with carbon fiber, epoxy film mixed with aramid fiber, or condenser paper etc. A paper with an
internal loss of 0.03 or more is good.
In the above embodiment, paper is used as the core material, but the core material and the
surface material may be made of paper. In this case, it is effective to further reduce the
resonance peak. Only one surface material may be formed of paper. The present invention is
configured as described above, and according to the present invention, it has the advantage of
being able to reduce the resonance peak without lowering the resonance frequency.
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