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DESCRIPTION JPS56132099

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DESCRIPTION JPS56132099
Specification 10 Title of Invention
Electrodynamic speaker
3. Detailed description of the invention French patent 1269138, first additional patent 87555,
French patent 6905859, 7107225, transducers (oscillating electrical energy) and couplers
(oscillating mechanical energy) A speaker is disclosed that includes an euphemism ππ π
including と. The transducer acts as a driver and the coupler acts as an element that imparts
vibrations to the layer of ambient air. The transducer comprises a plurality of permanent
magnets of identical or different lengths and arranged in parallel layers, in which the magnetic
field circulates in parallel paths defined by the parallel layers. The coupler (ie thin vibrating
diaphragm) is a low density material, preferably foam polystyrene (grooves and ribs are formed
on the inside surface of the diaphragm facing the expanded transformer, It is inside in the
vertical direction. A conductive band is adhered to the rib thus formed, which receives a swirl
corresponding to the sound transmitted. The band extends in the shape of an encircling
pufferfish and is named in the aforementioned patent the brief (greek). The main purpose of the
irf patent is to obtain crystal fidelity 3 without distortion in the coupler 3 and to allow
movements that are exactly parallel to each other, to improve the response curve edge at low
valleys, especially at low frequencies, and to harmful frequencies To eliminate the vibration of
the However, these goals have not been achieved in practice. The problem solved by the
invention In a truly specific embodiment, a solution to be added 714 is still given in view of
suspending the foam polystyrene diaphragm relatively to the common frame of the cell in which
it is provided. It is recognized that they did not Therefore, the object of the present invention is to
improve the suspension of the diaphragm so that the flexible support fixed thereto ensures that
all the rib movements in the gap of the pole piece are carried out in parallel. In the conventional
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suspension system, the control of the parallel movement of the diaphragm results in a slight
fluctuation of the driving moment and a local nonuniformity of the magnetic field uniformity. It is
impossible because of this, and as a result, the diaphragm tilts, moving in a direction
perpendicular to the magnet line, causing an impulse for malfunction, and even producing
harmonic vibration of the resulting frequency. Be done. The diaphragm suspension according to
the invention comprises at least two parallel units, each unit being connected to the respective
opposite end of the diaphragm, each unit being able to move in space while maintaining parallel
to itself It prevents distortions that occur as a result of torsional motion, and as a result prevents
distortion of the surface of the diaphragm, allowing the diaphragm to move correctly in parallel
without distortion.
In a preferred embodiment of the invention, each suspension unit of the diaphragm is a
geometrical tubular body of circular or polygonal cross section, formed of a sufficiently rigid and
elastic material, the deformation of said unit being either a diaphragm or a magnetic field The
drive torque of the transducer is that the tubular wall of the unit produces a twist about its axis,
as it is caused by the parallel movement of its generatrix so as to move parallel within it. It does
not occur due to the fluctuation of the magnetic field or the defect of the local magnetic field. In a
particular embodiment of the present invention, the material comprising the suspension unit is
comprised of a natural or synthetic resin impregnated fiber material, which provides rigidity and
stiffness by impregnation. According to another aspect of the present invention, the suspension
unit is a tubular body having a rhomboid cross-section, wherein the opposing corners of the
diamond are provided with a lip (tab), one of the tabs being The diaphragm is fixed to the frame
of the cell of the provided cell, and the local tab is resiliently connected to the diaphragm self
EndPage: 2 body. In this embodiment, the rhombic tubular body is constructed as an assembly of
two dihedral bodies of opposite orientation, with tabs at the ends of the panel, the tabs being
glued together in pairs. In a variant, the tubular body has a W-triangular shape, with tabs carried
at each end of the panel, which are respectively connected to the rim of the third panel in the
bent shape. Other effects and advantages of the present invention will be made clear by the
following description of the attached drawing ml. First, referring to FIG. 1 which is a prior art,
two parts 1 and 2 of a fixed frame of an electrodynamic-type 呼 call ← ス ピ ー カ speaker cell
are shown, and a diaphragm 3 made of expanded polystyrene is a support It is suspended via 4,5.
The supports 4 and 5 are made of a bent material (for example, a synthetic resin impregnated
fiber material). The reference symbols xx ', yy', zz 'indicate the axis of the fitting movement at the
right end of the diaphragm, which the conventional support 5 can not prevent. The occurrence of
such a twist causes a sound disturbance, whereas in the ideal situation the diaphragm only
moves in the direction AA 'perpendicular to the plane of the diaphragm. In FIG. 7, a tubular
suspension unit 6.7 according to the invention is formed from two dihedrals 6a, 6b and 6C + 6d,
respectively: 7a + 7b and 7c + 7d, which respectively have additional tabs 8, 9 and 10 ° 11 The
tabs 8, 11 are bonded to the frames 1, 2 and the tabs 9, 10 are bonded to the opposite ends of
the diaphragm 3.
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In this way, rhombic supports are respectively formed. The tubular body is made of a fiber
material that has been characterized as having appropriate IIIJjI properties and elasticity by
impregnating a synthetic resin. The panels of each dihedron do not deform in the diagonal
direction (Mlvl "-NN '), as shown in the second and third failure, thereby causing each support
unit to tear or wrinkle Rather, as shown in FIG. 4, they can be deformed parallel to themselves
and become flat. That is, as shown in FIG. 5, the generatrices of the tubular body are always
parallel to one another when extending or contracting along the rhombus axis (RR'-3S '). This is
an essential condition for all diaphragms or all their points to move in parallel under all
circumstances and regardless of the magnetic and / or electrodynamic condition y1. After
parallel deformation, the extensibility of the material causes the diaphragm to return to its initial
rest position. No distortion or wrinkling of the diaphragm occurs and no local parasitic vibration
occurs. The diaphragm vibrates in perfect synchronization with the transducer drive. In the
modification shown in FIG. 6, when the diaphragm 3 is suspended at four sides, the rhombic
tubular body is a triangular tubular body, and the third panel 12 is a bent shape.
4. Brief description of the drawings. FIG. 1 is a perspective view showing the expanded
polystyrene diaphragm suspended from the rigid frame of the cell by a suspension according to
the prior art 2. FIGS. 2 to 7 are illustrations of the present invention. Fig. 9 is a perspective view
showing the lower half of one example of the tubular suspension unit according to the present
invention, the second evil. FIG. 3 is a perspective view showing an example of a tubular unit. FIG.
4 is a view showing FIG. 3 and the ordinary unit of the open collar being displaced while
maintaining a parallel relationship, showing a state in which the tabs attached to each other and
attached to the fixed frame and the diaphragm are deformed Figure. FIG. 5 is an explanatory view
showing that no distortion occurs when the suspension unit of the rhombic cross section is
deformed. FIG. 6 is a diagram showing a tubular unit formed of a dihedron, and a panel in which
the third side is bent. FIG. 7 is a perspective view showing a diaphragm suspended by two
rhombus tubular units. 1.2: Fixed frame of cell 3: Diaphragm 6.7: Tubular suspension unit
EndPage: 36a, 6b; 6c, 6d; 7a, 7b; c, 7d: Dihedron 8.9.10.11: Tab 12: Curved shape panel agent
patent attorney Junnosuke Nakamura MuranoEndPage: 4
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