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'20 Inventors 3. Patent applicant <3) Request for application form 1 copy (4) Proxy letter 1"49148836" 8361 [phase] Japan Patent Office 0 JP-A-51-77219-0 Published Japanese Patent
Application 51. (1976) 7.5 Internal reference number Meg / 1f1 specification 1, title of the
Speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a speaker diaphragm in
which a damping material applied to a diaphragm substrate is improved. Conventionally, resin
such as acrylic resin, which has little change with time as a damping material, is plasticized and
applied to the edge or diaphragm slope, and the unnecessary parts produced on the diaphragm
exert a damping effect on abnormal vibration. However, the speaker diaphragm is required to
have a small amount, rigidity, and an excessive internal loss for absorbing not to cause abnormal
vibration. By the way, the above-mentioned damping material has a specific gravity of about 1.0
to about 1.4, and it is about 0.1 to 0.3 l more than the diaphragm of cone paper etc. Therefore,
when the damping material is applied in many places, the diaphragm itself It can only be applied
thin because the mass of For this reason, there were drawbacks such as being unable to obtain a
sufficient braking effect. The present invention has been made in view of the point of the fence,
and the object thereof is to provide a speaker diaphragm which can obtain a sufficient damping
effect since the density can be reduced in appearance and the thickness of the coating material
can be increased. It is to be. Another object of the present invention is to provide a speaker
diaphragm capable of improving the high frequency characteristic having a small specific gravity
as a result of a small damping material ratio l. Another object of the present invention is to
provide a loudspeaker diaphragm in which the internal loss has a flat characteristic with respect
to the frequency. Next, an embodiment of the present invention will be described with reference
to the drawings. (1) is a diaphragm, and in FIG. 1, it is cone paper, and in FIG. 2, it is a company
diaphragm. (2) is a coating agent obtained by adding a foaming agent to a known damping agent
or filler and applying it to the surface of the vibrating plate (1) and then heating it for several
minutes around 100 "C. In FIG. 1, (3) is an arrow and (4) is a frame. Next, a conventional
damping agent (a polyester and an acrylic resin in the form of a biscolloid) is applied to a
diaphragm of a plain weave, and a coating agent according to the present invention (foamed
powder and unvulcanized butyl rubber) The result of measuring the internal loss when it is
applied to a diaphragm and heated for several minutes at 105 ° C. is the plum garden of FIG. 6,
but as is also apparent from this diagram, the present invention The loss is about 0 or 1 larger
than that of the conventional one. Since this will lower the anti-competitiveness etc. by air
bubbles, the braking effect will increase more. Also, by changing the volume of the blowing
agent, the magnification can be changed to freely change the internal loss of the material. In the
present invention, since the apparent density can be lowered by foaming the foaming agent as
described above, it is possible to increase the thickness of the clothing material and to obtain a
sufficient braking effect.
As a whole, the ratio l decreases and Q decreases, and the resonance in the high region is small,
so that the reproduction of the high region and the improvement of the high region characteristic
can be achieved. Furthermore, as compared with the diaphragm made of foam itself, vibration
propagates the fiber which is the carrier, so the high frequency band spreads and the foaming
agent applied thereon absorbs the resonance, so that the diaphragm is well balanced. And so on.
4 and a simple explanatory view of the drawings show an embodiment of a speaker diaphragm
according to the present invention, and a partial cross-sectional view taken on line 1.2, and FIG. 6
is a drawing showing internal loss. + 11 diaphragm, (2) coating material patent applicant Pioneer
Co., Ltd. agent agent Shu Hideno, "˜ EndPage: 2 procedure correction! c) Spontaneous: June 77,
1984 Patent Office Director Hideo Saito 1, Display of the case 1949 patent · Application No.
148,836, 1 3, Article name to be corrected 4 糾 1 Drawing, JIk-4k7 鴇 14 , Relevant applicants
Relationships with applicants Address 1-4-1 Meguro-ku, Tokyo Name (501) PIONEER
CORPORATION 5-Agent address 2-1-1 Uchiyukicho Chiyoda-ku, Tokyo (Iino Building) 100
telephone Tokyo ((materials) 2) 3171 (substitute ll) full name (6Q 69) patent attorney Hideo
Hino-correction book (Japanese Patent Sho 49-148856) I will do my best for this application as
shown in Figure 3 sound attachment in the drawing. Applicant: Pioneer Corporation 1 Mr. Hideo
Kuwano. EndPage: 3