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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing only the left half
showing a conventional cone speaker, FIG. 2 is a side sectional view showing only the left half
showing a conventional edgeless speaker, FIG. The drawing is a perspective view showing one
embodiment of the damper main part of the speaker according to the invention, FIG. 4 is the
same perspective view showing another embodiment of the invention, and FIG. 5 is an
embodiment shown in FIG. It is a side sectional view showing only the left half of the edgeless
speaker configured. 1
····························································· − ..... post ..., 8 ... ... ring ... 9 ... ... hole ... 10 ... ... ring.
[Detailed description of the invention] In this invention, the sound emitted from the front and the
back in the wavelength or a sufficiently large range relative to the size of the damper is emitted
by the damper by utilizing the mutual cancellation by the phase difference of 180 degrees. The
purpose is to provide a speaker that is designed to attenuate sound as much as possible. In
general, many dampers are used in which a woven fabric impregnated with a phenol resin is
formed by a corrugated method, and one end of the damper is attached to a coil bobbin and the
other end is attached to an outer frame (frame). The center of the door system 60 is maintained.
FIG. 1 is a diagram of a conventional ruled prayer mountain showing the left half of a
conventional cone speaker, and its diver ID attachment is structured such that the '4iJ side
becomes an oven1. The rear is based on the outer frame 2, the −% circuit 3, and the coil bobbin
4. Therefore, in this case, the sound emitted from the damper 1 is not canceled, and the radiation
-J2t1 in front of it is an extra sound other than the sound emitted from the diaphragm 5-. For
example, in the case of Etsu Gilles, in the case of a speaker, its Ayazaki appears on the
characteristic of Yukida, and after removing the edge as shown in FIG. The sound from the rear
surface of the imaging unit i5D and the damper 1 is attenuated using the inertia reduction to
prevent outward radiation. However, according to the actual dust, it was found that the sound of
the damper 1 was not a small amount, giving a negative shadow number to the radiation caesar
characteristic and having one. That is, even if the flat caesar is radiated from the diaphragm 5,
the sound from the damper 1 causes an undulation of 3 (2) Y-y to 5 dB, and eventually the sound
of the damper is reduced as much as possible. There is no such thing. This invention has a phase
difference of 180 degrees between the sound emitted from the front and back of the damper 1 in
a range where the wavelength is sufficiently large compared to the thick weir of the damper 1,
and it achieves this by layering each other out The present invention provides a speaker having
an acoustic short circuit as a means, which will be described below with reference to the
embodiment shown in FIG. 3 to FIG. FIG. 3 is a perspective view of an essential part in the vicinity
of a damper showing one embodiment thereof, in which there are two dampers 1 in front and
behind, which are +, 3 air i! I: The outer periphery of the ring 8 held by three to four columns 7
embedded in approximately 3 is attached and attached. FIG. 4 shows another embodiment of the
present invention, in which the damper 1 is provided in the magnetic circuit 3, and the outer
periphery of the damper 10 is attached to the ring 10 having multiple fi FL 9's by 'II l. Becomes
In the embodiment of FIG. 3 described above, each of the two dampers (3) has an open J portion
communicating with both the front and back surfaces + C, so-called acoustic short circuit means?
In the embodiment shown in FIG. 4, both the front and back surfaces of Dan-1 are connected
acoustically through the above-mentioned several holes 9, and the so-called acoustic and shortcircuiting means are provided. . m5 ・ figure ri dameper mounting shown in Fig. 3 is a side-l view
on the left half of the left side view of the speaker with the edgeless construction applied with 4
structures. In the figure, the same reference numerals as the above-mentioned reference
numerals indicate the same parts. The explanation is Ministry 4 +, but what is shown by the
arrows in the father is a sound that represents the sound emitted from the front and back of each
of the two dampers l in an acoustic short circuit. It is also ○ that it was canceled and attenuated
by mutual, by radiating the sound to the same space. As described above, the present invention
provides a sound speaker by providing an acoustic short circuit means for canceling out the
sound emitted from both the front and back sides of the damper, for example, a space weak to
both the front and back sides 1. The sound emitted from both the front and back sides is a
wavelength band such as A where the thick grass of the dan (4) J'-bar is in the middle layer, and
the pregnancy is the same, and mutually cancel each other out of phase. It can be greatly
attenuated, and it can be used, especially when it is applied to a loudspeaker (if it is applied to a
loudspeaker 1-(or, it can almost obscure the disturbance of the characteristic for radiated sound
due to the damper sound, etc.).