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Speaker, (501) PIONEER CORPORATION President & CEO Shinzo Ishizuka [Phase] Japan Patent
Office 0 JP-A 50-671-31 Resigned number in the Office! The invention is equipped with a
diaphragm provided with a coating layer on the surface of a speaker, and the coating layer is
formed by coating a soft synthetic resin with a mixture of particles having a smaller specific
gravity than the resin. A speaker that is characterized by
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a loudspeaker having a
cone or dome diaphragm. A diaphragm applied to a high fidelity speaker is provided with a
coating layer made of a soft synthetic resin such as butyral rubber as a damping agent and a
filler. However, since the specific gravity of the synthetic resin used for the general coating layer
is generally about 1.0 to about 1.3, the thickness of the coating layer that can be applied without
excessively increasing the weight of the entire diaphragm. There is a limit to the above, and it is
not sufficient to improve the physical properties of the diaphragm, in particular the Young's
modulus and stiffness. An object of the present invention is to provide a speaker having excellent
acoustic characteristics by greatly improving the physical properties of the diaphragm while
suppressing the increase in weight as a whole of the diaphragm to a low level. One embodiment
of the present invention will be described with reference to the drawings. A syringe shown by /
in FIG. 71 has a pair of plates 2 and 3 and a magnet 1 inserted therebetween and a plate 3 fixed
thereto. A magnetic circuit 2 consisting of a pole piece S is removed. In addition, a cone-shaped
0-wave plate 7 attached to the frame / supports a cylindrical bobbin at its central portion, and a
poe coil p which is wound around a frame and a conohohin, between the plate λ and the pole
piece S. It is located within the formed annular magnetic gap. Reference numeral 10 denotes a
damper that elastically supports the central portion of the diaphragm 7, and // denotes a 2 ′ ′
L cap attached to the central portion of the diaphragm 7. Furthermore, the coating layer 12 is
formed with a suitable thickness on the front □ ° surface or rear surface ′ of the vibration tm
′ ′ 7 or, if necessary, on both sides. In this coated layer, 2 is added a glass microballoon in an
appropriate proportion to a synthetic resin solution used as one ordinary damping agent such as
an emulsion of petitla EndPage: 1-le rubber if The mixture is applied by means such as a spray,
and then formed by solidifying the synthetic resin solution. Here, the glass microballoon refers to
hollow particles having a diameter of about 10 to 250 μ and a specific gravity of about 0.3
mainly containing silicate. Instead of the glass microballoon, other particles having a specific
gravity smaller than that of the synthetic resin used as a damping agent may be used. The
coating layer 2 containing particles with such a small specific gravity has a lower specific gravity
than the coating layer consisting only of a normal damping agent, and when formed in a
thickness such that the same weight is obtained, the diaphragm 7 The stiffness and Young's
modulus as a whole are greatly improved, and as a result, by -4 °, the resonance characteristics
as a speaker are improved.
For example, in the case of a bass speaker, according to the experimental results. As shown in
FIG. 2, a marked improvement in the frequency characteristics nearness was observed on the
high frequency side of the reproduction frequency band. In FIG. 2, curve N shows the properties
obtained with the conventional damping agent applied, curve 9B with this damping agent with a
microballoon added at 40% by weight. Also, FIG. 3 shows a diaphragm 7 for a dome-shaped
speaker on which the same coating layer 2 as described above is formed. The stiffness is high,
which indicates that the diaphragm 7 behaves as a rigid body in the entire use frequency band. If
it is S, the coating layer 2 further increases this stiffness and acts to reduce the piston movement
zone by 1 and -5. Also, in the case where the diaphragm 7 forms a multiple resonance system as
shown in the equivalent circuit of FIG. In order to increase the internal loss due to the division
vibration of the diaphragm 7 itself, the coating layer / layer has a local division in a mode
resonating at 1 drive frequency (where M is the mass of the diaphragm 7 and S is the stiffness of
the edge portion). Vibration is generated, and in the mode beyond that, no force is applied
because mechanical resistance becomes large, and as if it were cut off in the high region, the
apparent mass becomes small, and the acoustic energy is also high in the high region. It is
stabilized and the influence of 1 phase difference also becomes small.
4. Brief description of the drawings FIG. 1 is a longitudinal sectional view of a part of a speaker
according to an embodiment of the present invention, FIG. 2 is a graph showing the
characteristics of the speaker, and FIG. 3 is a speaker according to another embodiment. FIG. 4 is
a longitudinal sectional view showing a part, and FIG. 4 is an equivalent circuit diagram of the
same speaker. l・・・フレーム、コ・・・プレート、3・・・プレート。 V · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · magnetic circuit, 7 · · · diaphragm ,! ・・・ボビン、? ... voice coil, lO ... dumber,
// ... cap, / 2 ... applied layer. Patent Assignee Pioneer Corp. Siseki Doujinshi Shinji Ohashi
EndPage: 2 (1) Inventor (2) Agent Tokyo Nishi-shinjuku 1-chome 9-12 No. O Oh Taisho Building
Building 4F 11. . Patent Attorney Nobuyoshi Kohashi) (乙 3st) Telephone Tokyo (3 グ 2) 4tgJg-ρ
No. Address change notification February 16, 1974 Patent Office Secretary Hideo Saito 1, display
of case 6 48 48 2, title of the invention 2, title of the invention 辷 0-power 3 person who
changed the address 2! EndPage: 3
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