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JPS5730497

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DESCRIPTION JPS5730497
Description 1, title of the invention
Speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a diaphragm for a
speaker in which skin materials are attached to both sides of a core material. Loudspeaker
diaphragms are all over the 2nd frequency band. The sound pressure frequency characteristics,
because so-called divided vibration occurs where only the portion close to the voice coil vibrates
when the diaphragm represented by the conventional cone paper becomes a certain frequency or
more. The basic performance as a speaker such as distortion is deteriorated, and high fidelity
reproduction is hindered. In recent years, in order to solve these problems, flat diaphragms using
a honeycomb sand-inch structure or the like have been adopted. A speaker using such a
lightweight, high-stiffness diaphragm vibrates in the same phase over the entire surface up to a
high frequency with a flat sound pressure frequency characteristic, a low distortion rate, and
furthermore, a diaphragm with a flat phase frequency It has features such as flat characteristics.
The present invention relates to a speaker in which a skin material is bonded to both sides of a
core material made of a metal thin film, and among the speaker characteristics, a frequency
range that vibrates in the same phase on the entire surface can be expanded and sound pressure
characteristics flat to higher frequencies. The high end of the piston movement of the diaphragm
of the speaker diaphragm EndPage: 13, ... which is to provide a speaker diaphragm from which is
obtained. Since the wave number is proportional to the sound speed of the diaphragm itself (the
square root of the specific elastic modulus), it needs to be made of a lightweight, high elastic
material. Also, in order to achieve this purpose, the thickness of the moving plate is simply
increased, and the efficiency of the entire speaker decreases even if it is made of a material with
high density, so the characteristics of light weight and high rigidity are utilized to make
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honeycomb sand inch. Many structures are adopted. Conventionally, an aluminum 'alloy foil
having a large specific elastic modulus and relatively easy to thin is used as a material
constituting these structures, but in order to make the piston move to a higher frequency, a foil
higher than the aluminum is used. It must be made of a material with a high specific modulus.
Materials with higher specific elastic modulus than aluminum include lightweight high Young's
modulus materials such as boron and valerium 2. However, when using these alone, the internal
loss of these materials is extremely small. Is a problem. A diaphragm made of a material with a
small internal loss has a large rise and fall peak in sound pressure at the resonance same wave
number, which is a major obstacle in system design. If the resonant frequency is drawn using a
specific elastic modulus dogwood material and the resonance peak is large, the network must be
leveled down from a relatively low frequency to attenuate it, and the high elastic modulus
material There is no point in using it.
Therefore, in the present invention, as a skin material of the diaphragm, a cocoon film in which
silicon carbide (sic) having a higher elastic modulus is attached to a composite of mica and epoxy
resin having a specific elastic modulus higher than aluminum and a relatively large internal loss.
By using it, the resonance frequency is raised while keeping the resonance peak small. The
present invention will be described according to the following examples. FIG. 1 shows a treble
diaphragm having a diameter of 3.5 cm according to an embodiment of the present invention. In
FIG. 1, 1 is a core material in which a long aluminum foil of 20 ?m in thickness and 9 mm in
width is alternately folded and arranged radially at the central portion and the outer peripheral
portion of the circle. Each edge has a circular skig V2.2 'attached to it. 2 shows an enlarged cross
section of a part of FIG. . ??? 1 is a core material made of the aluminum foil, and 2 ░ 2 'is a
skin material bonded to the upper edge and lower edge of the core material 1 with an adhesive 3,
3'. The skin materials 2, 2 'are a composite thin film 4, 4' made of mica and an epoxy resin, and a
1 ?m thick silicon carbide (SiC) 7?5 formed on the surface of the composite thin film 44 4 '. , 5
'. The composite thin film 4, 4 'is formed by heating and pressing a flake-like mica and an epoxy
resin having a size of about 100 mesomes in the ratio of (7-8) :( 3-2) by sheet forming method.
The epoxy resin is cured to have a thickness of 2 ?m. Silicon carbide (SiC) is attached to the
surface of the composite thin film 4.degree. By high frequency sputtering to form a silicon
carbide layer 6, 5 ', thereby forming skin materials 2, 2'. A comparison of specific modulus and
internal loss of a skin material made of aluminum, a skin material made of a composite thin film
of mica and epoxy-resin, and a skin material made of mica and epoxy N (a composite thin film
made of oil and grease attached with S-G) It shows in the table. ??? As apparent from the
above table, the specific elastic modulus of the mica-epoxy composite film is higher than that of
aluminum, and it can be seen that it is further increased by depositing SiC. The internal loss is
also thicker than aluminum. Therefore, according to the diaphragm using the skin material of this
embodiment, the resonance frequency is higher and the sound pressure peak at the resonance
frequency is smaller than that of the diaphragm using the aluminum skin material. FIG. 3 shows a
so-called node drive EndPage: 27 '-2, in which a node at a primary resonance frequency of the
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diaphragm is driven by a voice coil. It is a wave number characteristic for sound pressure at the
time of using it as a speaker by a method.
According to the present embodiment, the high frequency reproduction limit frequency is
increased from 20 KHz to 25 KHz and the resonance peak is reduced from 7 dB to 3 dB as
compared with the conventional diaphragm B using the aluminum skin material. . Although the
composite thin film is made of mica and an epoxy resin in the above embodiment, not only the
epoxy resin but also a thermosetting resin may be used. The present invention is configured as
described above, and according to the present invention, a speaker diaphragm having excellent
specific elastic modulus and internal loss is obtained, and a speaker using this diaphragm
increases the high frequency reproduction limit frequency. And the resonance peak is reduced.
4. Brief description of the drawings. FIG. 1 is a top view showing a part of the speaker diaphragm
in a cutaway view in one embodiment of the present invention, FIG. 2 is a partially enlarged
sectional view of the same diaphragm, FIG. These are the sound pressure frequencycharacteristics figures of the speaker using the conventional diaphragm, and the speaker using
the diaphragm of this invention. 1 ииииииии Heartwood, 2.2 ? иииииииииииииииииииииииииииии Adhesive, 4,4 ? иииииииииииииии
Composite thin film, 5,5 ? ..... Silicon carbide layer. Name of agent Attorney Nakao et al. 1
person Fig. 1 Fig. 3 Fig. 7 Iil I will * () I, F) EndPage: ?
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