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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the structure of
the speaker, FIG. 2 is a cross-sectional view showing the structure of the edge portion of the
speaker of this invention, and FIG. Sound pressure frequency consideration of the speaker
(dotted line) and the edge part of this device Spy easy 10 sound pressure frequency! The figure
which shows (solid line), FIG. 4 shows the speaker Q transient (distortion) characteristic (dotted
line) which has the edge part 5 of the prior art, and the speaker Q transient (distortion)
characteristic (solid line) which has edge part 5 'of this invention. FIG. 7 is a layer containing
open cells, 8 is a layer containing single cells, 5 'is an edge portion, and 4 is a diaphragm. 図 l
Figure 1 125-Judo 51-[21 o 54 (2) 3 rd F: 1-126-J F 51-121 054 (3) 因 4 th lap S! . Number (It)127-
[Detailed description of the invention]-This invention is a structure of a speaker having an edge
portion formed by skillfully combining two layers of an open cell layer and a single cell layer in
the diaphragm of a cone-shaped speaker 6; About. In a cone-shaped speaker, as shown in FIG. 1,
a cone-shaped diaphragm 4 is attached to the end of a voice coil 3 held by a damper 2 in an
annular magnetic gap 1 and vibration generated by voice current flowing in the voice coil 3 To
the diaphragm 4 to generate a sound. Thus, since the cone-shaped diaphragm 4 is attached to the
outside of the frame 6 through the edge portion 5 having the corrugation formed on the outer
peripheral portion, the edges 5 and 6 receive vibration of the diaphragm 4. Give various effects
to the diaphragm meeting. Therefore, the following points are required as conditions of the edge
portion 5 with respect to the vibration width 4. First of all, the non-linear suppression is not
applied to the displacement of the diaphragm 4, especially the displacement during large
vibration, that is, the linearity is good for the displacement, and secondly, the lateral vibration of
the diaphragm 4 On the other hand, the center holding function to support to vibrate in the
correct axial direction is excellent, or the other two conditions largely vary depending on the
shape of the corrugation of the edge portion 5. Third, since it receives intense vibrational energy
of the diaphragm 4 over a wide frequency, it has a function to absorb and buffer the vibration.
And, by eliminating the reflection of the vibration from the edge portion 5 on the diaphragm 4,
this is a function not to cause the diaphragm 4 to generate unnecessary resonance due to the
parasitic vibration. Fourth, in order not to reduce the acoustic radiation efficiency of the entire
vibration system, the edge portion 5 is required to have a small mass. This condition is also
closely correlated with the linearity of the first requirement. The first condition is that the sound
from the front and back surfaces of the diaphragm 4 is completely cut off. In particular, there is
no air permeability between the front and back in order not to reduce the radiation efficiency
particularly in the low range. As a sixth condition, it can be said that the edge unit 5 is required
to have no qualitative change with age, heat, and humidity, in order to prevent the change in
reproduced sound quality for many years as a speaker. Under the following conditions, the
conventional edge portion 5 has a stick-like structure, so each has its own unique drawbacks.
That is, the edge portion 5 integrally formed with the vibrating plate 4 (made of paper) is
inexpensive and can be excellent in mass or small, or it is said to be linear with respect to large
amplitude, vibration absorption, and aging. It is inferior from the aspect. An edge 5 made of a
material out of the paper amount, which is attached to the outer periphery of the diaphragm 4 or
made of a cotton cloth, is coated with a paint on the cloth and crushed to form an edge The part
5 has a large mass due to the weight of the paint, and the material of the paint itself is likely to
change, and the bond with the cloth fibers is not strong, so it is easy to peel off, so it has a defect
that aging easily occurs.
The edge part 5 which molded a rubber thin film such as organic rubber is rumored \ 1. 2.) The
tensile force is large, or it exhibits excellent linearity even during large swings, or the ability to
absorb vibrations is not sufficient because of strong elasticity. Therefore, it causes parasitic
vibration to the diaphragm 4 and has a large mass, so it has the disadvantage of reducing the
radiant fat ratio of the speaker. As it requires a lot of In order to compensate for the defects of
the rubber edge part 5, there is an edge part 5 where foam rubber is molded, or a single cell is
contained, so it is smaller compared to the mass or rubber, and the conduction loss of vibration
due to the bubble For the vibration absorption is better than that of rubber, it is not enough.
Further, the urethane foam edge portion 5 has a defect substantially similar to that of the foam
rubber edge portion, or is slightly inferior in vibration absorption. If the volume density is
increased in order to improve vibration absorption, the elasticity is increased and the
suppression performance against lateral vibration is deteriorated, and the air blocking property
is not improved only because it is only an open cell body. doing. This invention is a speaker
having an edge portion 5 'of a structure capable of solving various defects as described above
and further improving the reproduction sound quality. That is, the urethane foam sheet 8
containing single cells is heat-formed by superposition on the urethane foam sheet 7 containing
open cells as in the edge portion 5 'shown in FIG. This is a speaker in which an edge portion 5
'which is attached and molded is attached to the outer periphery of the vibrating portion 4. That
is, it is a speaker which has edge part 5 'which stuck and formed the open-cell sheet 7 and the
single-cell foam sheet 8 in piles. Thus, the mass of the material is small because the edge portion
5 'of the inventive speaker is either a component layer or a foam-containing body. Then, the open
cell layer 7 of the main component circulates air as the volume changes, and the friction of the
vibration energy of the diaphragm 4 has a large advantage as compared with a single cell due to
the friction thereof, or elasticity Of the suppression of the vibration due to the thickness (not
enough, the center holding function of the vibration system is not sufficient, and the low
frequency radiation efficiency of the speaker due to the ventilation is lowered. Have. However,
the defects of the turtle 6 and the like can not be absorbed by the shape or size of the
corrugation of the edge portion 5 '. Since the elasticity can be appropriately maintained by the
single cell layer 8 closely adhered to these defects, the linearity of vibration suppression becomes
good and the center holding function also becomes good.
In addition, there is no need for ventilation, and the front and rear surfaces can be completely
shut off. Furthermore, both layers 7 and 8 or edge part 5 'of the continuous bubbles and the
bubbles containing Germany are in close contact with each other, and both layers 7 and 8 have
different vibration absorption characteristics (resonance characteristics) or different mass.
Because they are different from each other, vibration absorption characteristics interfere with
each other to smooth the sharp peaks and valleys of the sound pressure frequency
characteristics of the speaker as shown in FIG. 3, and also the transient (distortion)
characteristics as shown in FIG. It becomes good. Moreover, since the contact surfaces of the two
layers are easily fused by heating, no separate adhesive is necessary, and the entire surface is
adhered evenly without unevenness, so the process can be simplified and the affixing surface is
peeled off. There is no risk of doing so, and the original shape of the product can be maintained
for many years, and a stable bonding state can be obtained. Thus, this invention allows the open
cell layer 7 and the single cell layer 8 to be carefully combined 7) in the edge portion, and
complements the oversize of both layers 7 and 8 to have excellent characteristics. Speaker. The
same effect can be obtained even if both layers 7, 8 or any one layer is two or more calendar
months, and the same effect can be obtained with materials other than polyurethane. Can.
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