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1 ? ?-mid specification 1, title of the invention
3. Detailed Description of the Invention The present invention relates to a speaker provided with
a mechanical filter, which prevents rolling (rotation phenomenon) of a bobbin or a diaphragm
and narrows a magnetic gap to enable highly efficient reproduction. . FIG. 1 shows a loudspeaker
provided with a mechanical filter, in which 1 is a center pole, 2 is a magnet, 3 is a plate, and 4 is
a center pole, and the magnetic gap between the center pole 1 and the plate 3 is movably 2 '. A
voice coil 6 provided is a damper for coupling between the bobbin 4 and the plate 30, 7 is a
frame, 8 is an edge, 9 is a cone-shaped diaphragm having a leading edge coupled to the end of
the frame via an edge 8, 1o Is a mechanical filter that joins the bobbin 4 and the trailing edge of
the diaphragm 9. The mechanical filter 1 o of the present invention is constituted by a damper
having a so-called corrugation structure formed in a wave shape in the radial direction. With this
configuration, it is possible to prevent the reproduction of high tones and reproduce only the low
tones. That is, when a low frequency signal is input, the bobbin 4 vibrates gently, the mechanical
filter 10 also operates following the movement of the bobbin 4, and the diaphragm 9 is driven
accordingly, so that the bass is reproduced. To be done. However, when a high frequency signal
is input, the bobbin 4 vibrates violently, the mechanical filter 10 can not follow the vibration of
the bobbin 4 and the vibration of the bobbin 4 is absorbed by the mechanical filter 10 and
transmitted to the diaphragm 9 It will not be done. As a result, when the reproduction of highpitched sound is interrupted EndPage: 13 to 1 ', if such a speaker is attached to the baffle plate of
the speaker box and the axis of the bobbin 4 is arranged in the lateral direction as shown in FIG.
The diaphragm 9 and the bobbin 4 are bent by weight, and the gap width between the bobbin 4and the center ball 1 (still the voice coil 5 and the plate 3) is not constant in the gap
circumferential direction. When the speaker is driven in this state, rolling (rotational
phenomenon) occurs due to the deviation between the center of gravity and the support point,
and the narrow gap portion is formed by the bobbin 4 and the center pole 1. Alternatively, a
phenomenon called gap rubbing may occur, which causes the voice coil 5 and the plate 3 to rub
against each other, resulting in generation of abnormal noise or distortion. In order to solve this
problem, it is conceivable to increase the gearing width 4 in advance, but this causes a new
problem that the magnetic flux density is lowered and the efficiency of the speaker is lowered. In
particular, when the mechanical filter 1Q is configured with a corrugation damper as in this
example, the axis of the bobi 4'-done 4 is very easily deformed due to the movement from a to b
in FIG. Deflection and rolling are likely to occur.
As a method of solving this problem, it is conceivable to add another corrugation damper 11 as
shown in FIG. 4 to make it a double damper. In this way, the distance between the two dampers
becomes of the moment, and the splash constant with respect to the radial displacement of the
dampers becomes large, so the moment becomes larger compared to the deformation with one
damper. The deformation from a to b in FIG. 3 is also less likely to occur. When an actual speaker
is constructed using such a double damper, as shown in FIG. 5, the damper 11 to be added is
used as the damper itself, and the bobbin with the damper 6 shown in FIG. 4 and Kum 7 (still
plate 3) or, as shown in FIG. 6, the damper 11 to be added is used as a mechanical filter and the
bobbin 4 with the mechanical filter 10 shown in FIG. It is considered to be coupled between the
diaphragm 90 and the diaphragm 90 by 5t ? ?-]. Of course, it is conceivable to make the
damper itself into a double structure, and also make the mechanical filter into a double structure,
or such a complex structure is disadvantageous in cost and is not practical. Here, FIG. 7 is a
schematic diagram of the mechanical relationship of the speakers in FIG. 5 and FIG. In FIG. 7, 12
is a voice coil mass, 13.14 is a spring spring corresponding to a damper and a mechanical filter,
15.16 is a fulcrum, 17 is a diaphragm mass, 711 is a distance between the voice coil mass 12
and the fulcrum 16, 12 is When the external force f acts on the voice coil mass 12, the distance
between the fulcrum 15 and the spring 14 and the distance 15.14 is the distance obtained by
dividing the distance between the spring 4 and the fulcrum 16 by the center of gravity. The
displacement angle, X, represents the displacement of the voice coil mass 12 due to the external
force f. The spring 13 corresponds to the damper 6.11 of FIG. 6 and the damper 6 of FIG. 6, and
the spring 14 corresponds to the mechanical filter 4 of FIG. 5 and the mechanical filter 10.11 of
FIG. When an external force f is applied to the voice coil mass 12 by using ++ for the spring
constant which defines the relationship between the displacement angles ? and 6 of M and K as
M = K1 О ? and 2 О ? respectively. The displacement X is expressed by the following (+)
equation. However, R1: mechanical resistance of the spring 13 R2: mechanical resistance of the
spring 14: voice coil mass 12 m2: diaphragm mass 17 W: resonance angular frequency zD-wo at
which the displacement X represented by the vibration angular frequency (1) becomes maximum
End point: 27-head WOM? = ? where R: mechanical resistance of the material M: mass of the
vibration system C: compliance of the vibration system From the equation (3), the condition that
C, M, R are the same Is the resonant angular frequency W.
(1) A set of ten included terms (? shown in equation (2)) can be treated as a constant. Therefore,
according to equation (1), the spring constant is 1. It can be seen that the displacement X
becomes smaller as 2 increases independently, and becomes stronger against rolling deflection.
Also, although it is better for 12 to be long, this is practically limited because the spacer is long
and the bobbin is weak, and it can not be too long. It's jealous! 3 and 14 should be as short as
possible. However, as long as a cone-shaped diaphragm 8 ? ? ? is used, the positions of the
supporting point 16 and the diaphragm mass 17 corresponding to the spring 14 corresponding
to the mechanical filter and the edge are different. It can be seen that there is a limit to reducing
the displacement X shown by the equation (1) without becoming + 14-0. Therefore, the present
invention provides a speaker in which the coefficient K2 is made infinite by making the above
115 + 44 zero, and the displacement X of the voice coil bobbin shown by the equation (1) is
made small. An embodiment of the present invention will be described below with reference to
FIG. In FIG. 8, parts having the same functions as those in FIGS. A planar diaphragm 18 having a
honeycomb structure is provided with a circular opening 18a at the center thereof. Reference
numeral 19 is a dust camp covering the opening. The mechanical filter 1o is mounted between
the outer periphery of the bobbin 4 and the inner peripheral surface of the opening 18a. As
described above, if the diaphragm is made up of the plane diaphragm 18, then the sum of 13 + #
14 in equation (1) becomes zero and the coefficient of K2 becomes infinite, so that the
conventional cone-shaped diaphragm is used. The displacement I with respect to the external
force f can be made smaller than that used, and a speaker that is strong against the deflection of
the diaphragm 18 and the bobbin 4 can be configured. It is desirable that the junction between
the edge 8 and the mechanical filter 1 ░ with the diaphragm 18 be closer to the center of
gravity of the diaphragm 18. However, when the mass of the dust cap 19 can not be ignored with
respect to the mass of the diaphragm 18, it is more desirable to be closer to the center of gravity
of the combined mass of the diaphragm 18 and the dust cap 19. Of course, the bobbin 4 and the
mechanical filter 10-may be coupled via an appropriate gap. As described above, according to the
present invention, rolling and gap rubbing can be prevented by using the flat diaphragm 0 as a
diaphragm of a speaker provided with a mechanical filter. Further, since the second damper 11
shown in FIGS. 5, 6 and 6 is also unnecessary, it is extremely advantageous in terms of
workability at the time of assembly, and also in terms of cost.
4. Brief description of the drawings. FIG. 1 and FIG. 2 are sectional views of the conventional
example, FIG. 3 is a diagram of its operation explanation and FIG. 4 is a diagram conceptually
showing an improvement method of the conventional example. 6 and 7 are half sectional views
of the improved conventional example, FIG. 7 is an operation explanatory view of FIG. 5 and FIG.
6, and FIG. 8 is a sectional view of one embodiment of the present invention. DESCRIPTION OF
SYMBOLS 1 ... Center pole, 2 ... Mcnet, 3 ... Plate, 4 ... voice coil bobbin, 5 ... Voice coil 6, 6 ...
Damper, 7 иииииииииииии Frame, 8 edges, 18 иии Flat diaphragm, 18a иии Opening, 19 ииии Dust cap. Name of
agent Attorney Nakao Toshio other 1 EndPage: 3 Figure 1 8! Fig.2 Fig.4 Fig.5 Fig.7 Fig.4 Fig.8
EndPage: ?
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