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Speakers ■ Japanese Patent Office Open Patent Publications ■ Japanese Patent Application
Laid-Open Nos. 50-68j, 31 [Phase] Published Japanese Patent Application 50. (1975) 6.7. J17425 "Office internal reference number 61b5" Specification 1 In the present invention, a
vibrating plate provided with an application layer for braking on the surface is provided, and the
application layer is a mixture of a synthetic resin and an organic foaming agent. A speaker
characterized in that it is made of a soft foam formed by applying K to the surface of the abovementioned diaphragm and foaming it just in case. 3 relates to a speaker with a detailed
description of the light. 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 synthetic resin generally used in ordinary coating layers is
about 1.0 to about 1.3, which is considerably larger than the specific gravity of the diaphragm of
0.7, sufficient damping action or When a thick coating layer is formed to the extent that it can
provide a blocking effect, the weight of the entire diaphragm increases and the reduction in the
speaker conversion efficiency is improved. The object of the present invention is: It is an object of
the present invention to provide a speaker having excellent acoustic characteristics by largely
altering the physical properties of the diaphragm while suppressing the increase in weight as a
whole of the moving plate. One embodiment of the present invention will be described with
reference to the drawings. A frame indicated by reference numeral 3l with 1 m of tusks is fixed to
a pair of plate co p3 and a magnet dab inserted between both of them and plate 3. A pole piece!
A magnetic circuit 6 is attached. In addition, a cone-shaped diaphragm 7 attached to the frame 1
has a cylindrical bobbin tt supported mL at its central portion, and this mepin tK can be regarded
as an annular magnetic magnetic member formed between the plate cove and the mail bee 75. It
is located in the gap. Reference numeral 10 denotes a central portion of the diaphragm 7 which
elastically supports and holds the damper, and a mirror which is attached to the central portion
of the diaphragm 7. Furthermore, the coated layer / J is formed to have an appropriate thickness
on the front surface or the rear surface of the diaphragm 7 or on both surfaces as needed. This
coating layer 1 is obtained by adding a foaming agent acting at a relatively low temperature
(preferably Zoo to 150 '(3) such as 1-p-toluenesulfonyl hydrazide or the like to a soft synthetic
resin of acrylic resin type or urethane resin type. The resulting mixture is applied by one means
such as spraying, and then heated to a predetermined temperature to form an action as a
foaming agent and a certain degree of solidification of the synthetic resin. Make up the body.
The coating layer 12 made of such a surface foam has a lower specific gravity than the normal
coating layer containing no bubbles, and if the thickness of the coating layer /-is the same, the
diaphragm and the coating layer 12 The total weight with is smaller than the conventional one.
Therefore, while the decrease in conversion efficiency due to the weight increase of the vibration
system is slight, remarkable alteration of the acoustic characteristics is achieved. Further, FIG. 2
shows one in which the same coating layer / layer as described above is formed on the surface of
the diaphragm 70 for the dome-shaped speaker. In the case where the diaphragm 7 also covers
the frequency band that forms a large resonance system as shown in the equivalent circuit of the
fan 3 shown in FIG. It exhibits high mechanical resistance due to the increased internal loss to its
own resonance. When driven at a high frequency, the local split vibration occurs at the stiffness
that resonates with that frequency), and the mechanical resistance is large at further modes °,
so no force is applied. The apparent mass is reduced as if it had been cut in the high range. As a
result, the high echo energy is stabilized even in the high region, and the shadow of the phase
difference is reduced. The frequency characteristics and harmonic distortion characteristics of
the tweeter provided with a diaphragm having the structure as shown in FIG. 2 are shown in FIG.
The characteristics of the tweeter using the vibrating plate are shown in FIG. 4B. As apparent
from this characteristic diagram, the upper limit of the re-main frequency of the speaker
according to the present invention is extended, and the harmonic distortion characteristic
EndPage: 26 is another inventor, representative (1) inventor (2) Person Tokyo Shinjuku Ward
Nishi-Shinjuku 1-chome 9-12 o Taisho building building the fourth floor Principle pressure
Ohashi Shinji (g, y day) telephone Tokyo (3 guco) tigs g-addiction address change notice
February 16, 1974 patent Director General 1 FM Heroes 1; Display of the Case Patent
Application No. 11'742S No. 2 of the Case, Name of the Invention '-2, Name of the Invention'
Person who changed the address of the invention EndPage: 3
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