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JP2007104713

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2007104713
To provide a transducer with reduced harmonic distortion. A dynamic transducer (9) includes a
frame (10), magnet assemblies (12, 13, 14) for producing a magnetic field across an air gap (15),
a voice roll (17) and a coil former (16) supporting the voice coil (17) in the air gap (15). A
diaphragm 18 having an outer periphery and a top, and an edge member 19 connected to the
outer periphery and the frame to support the outer periphery from the frame. The spider 20 is
coupled to a coil former to support the voice coil in the air gap. A coil former is coupled to the
top such that the current flowing through the voice coil and moving the voice coil in the air gap
moves the diaphragm. The spider has spirals (20-3 to 20-10) radially outward from the coil
former. The edge member 19 'may have a spiral radially outward from the outer periphery. The
swirl includes an arc that cuts the tip. [Selected figure] Figure 3
Regression hinged spider
[0001]
TECHNICAL FIELD The present invention relates to a dynamic transducer (dynamic converter).
Although dynamic transducers are disclosed focusing on moving coil loudspeakers, they could be
used in other areas as well.
[0002]
BACKGROUND OF THE INVENTION A wide variety of loudspeaker structures having a wide
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variety of suspension types are known. For example, US Pat. Nos. 2,201,059, 2,295,483,
3,930,129, 4,146,756, 5,715,324, and 5 below. , 729, 616, there are loudspeakers described and
described. This example is not intended to be exhaustive search of the prior art or to indicate that
there is nothing applicable other than the above, and should not be taken in such a sense.
[0003]
Loudspeakers (loudspeakers) have clear limitations in the nearly linear range of motion of the
voice coil, the diaphragm and other moving parts including the voice coil and suspension
elements for the diaphragm. The non-linearity gradually increases as the displacement of the
diaphragm expands to the limits determined by the geometry of the motor structure and / or the
suspension elements. Linearity or non-linearity is often indicated by graphs of force and
displacement. The maximum value of the substantially linear motion can be ascertained from a
function or curve of force versus displacement. This is generally referred to as the "flat" region of
the force-displacement curve. The loudspeaker does not faithfully convert the input current to
speech when driven beyond this region. This inaccuracy is often referred to as harmonic
distortion. Heretofore, the roll height, ie the depth of the spirals of the suspended spider and
cone peripherals, has been increased to reduce harmonic distortion. However, increasing the roll
height leads to an "oil canning" or reversal of one or more rolls, which can be identified when the
reversed roll substantially returns to its designed orientation. Generates a pop. Furthermore,
increasing the roll height reduces the lateral stability of the loudspeaker's moving mechanism, so
that, for example, the voice coil has a side-to-side motion in the air gap.
[0004]
SUMMARY OF THE INVENTION According to one aspect of the present invention, a dynamic
transducer (dynamic transducer: electrodynamic transducer) comprises a frame, a magnet
assembly for providing a magnetic field across an air gap, a voice coil, A coil former for
supporting the voice coil in the air gap, a diaphragm having an outer periphery and a top, and an
edge member connected to the outer periphery and the frame for supporting the outer periphery
from the frame . A coil former is connected at the top, so that the current flowing through the
voice coil and moving the voice coil in the air gap causes the diaphragm to move. The edge
member has a spiral radially outward from the outer periphery. The swirl contains a truncated
arc.
[0005]
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In one embodiment according to this aspect of the invention, the spiral also includes a generally
straight portion extending between adjacent truncated arcs. In another embodiment according to
this aspect of the invention, the depth of the tip cut is not uniform with increasing distance from
the perimeter. In yet another embodiment according to this aspect of the invention, the depth of
the tip cut increases with increasing distance from the perimeter. In yet another embodiment
according to this aspect of the invention, the depth of the tip cut varies pseudo-randomly with
increasing distance from the perimeter.
[0006]
According to another aspect of the present invention, a dynamic transducer has a magnet
assembly for providing a magnetic field across an air gap, a voice coil, a coil former for
supporting the voice coil in the air gap, and a top A diaphragm and a spider coupled with the coil
former to support the voice coil in the air gap. The coil former is connected to the top and flows
through the voice coil such that the current moving the voice coil in the air gap moves the
diaphragm. The spider has a swirl radially outward from the coil former. A swirl contains a
truncated arc.
[0007]
In one embodiment according to this aspect of the invention, the spiral also includes a generally
straight portion extending between adjacent truncated arcs. In another embodiment according to
this aspect of the invention, the depth of the tip cut is not uniform with increasing distance from
the coil former. In yet another embodiment according to this aspect of the invention, the depth of
the tip cut increases with increasing distance from the coil former. In yet another embodiment
according to this aspect of the invention, the depth of the tip cut varies pseudo-randomly with
increasing distance from the coil former.
[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will be better
understood on reading the following description with reference to the accompanying drawings
which illustrate the invention. As shown in FIGS. 1 to 3, the loudspeaker 9 includes a support
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frame 10 and a motor assembly. The illustrated motor assembly includes a backplate / center
pole 12, permanent magnets 13 and a front plate 14 to create a substantially uniform magnetic
field across the air gap 15. The voice coil former 16 supports the voice coil 17 in a magnetic
field. The current from the amplifier 40, which relates to the program material to be converted
by the loudspeaker 9, drives the voice coil 17 and causes an axial reciprocating motion in the air
gap 15 in a known manner. The cone 18 attached at the top to the end of the coil former 16
disposed outside the motor assembly 12, 13, 14 has its outer periphery connected to the frame
10 by an edge member 19. The outer periphery of the spider 20 is connected to the frame 10.
The spider 20 includes a central opening 22 to which a voice coil former 16 is attached. A
suspension including edge member 19 and spider 20 constrains voice coil 17 to reciprocate
axially within air gap 15.
[0009]
Although this is not the only one, FIG. 1 shows a typical mechanism for electrically connecting
between the loudspeaker terminals 24 and 25 and the voice coil wires 26 and 27. The voice coil
wires 26 and 27 are attached to the side surfaces of the coil former 16 and pass through the
central opening 22 and the intersection of the coil former 16 and the top of the cone 18. The
lines 26, 27 are then mounted across the face 32 of the cone 18 to points 28, 29 on the face of
the cone 18 where they are connected to the flexible conductors 30, 31. Connections 28, 29 may
be made using any of the many techniques available. As shown, the coiled wires 26, 27 are
secured to the face 32 of the cone 18 by a non-conductive adhesive.
[0010]
The spider 20 tapers recursively from its inner swirl 20-1 to its outer swirl 20-10. The spiral 201 disposed adjacent to the coil former 16 is, for example, a circular arc having a radius of 1.8
mm. The spirals 20-2 to 20-10 are arcs having a radius of 2 mm, for example. However, outside
the spiral 20-2, the spiral 20 has a truncated tip. That is, a more or less flat top is formed on the
top of each spiral from the spiral 20-2. As the radius from the center line of the coil former 16
increases, the width of the flat portion increases. In the drawing, the width of the flat portion at
the top of the spiral 20-3 is 0.5 mm. The width of the flat portion at the top of the spiral 20-4 is
1.0 mm. The width of the flat at the top of the spiral 20-5 is 1.5 mm. The width of the flat at the
top of the spiral 20-6 is 1.5 mm. The width of the flat at the top of the spiral 20-7 is 1.75 mm.
The width of the flat at the top of the spiral 20-8 is 1.75 mm. The flat at the top of the spiral 209 has a width of 2.0 mm. Finally, the flat at the top of the spiral 20-10 is 2.0 mm wide.
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[0011]
The spider 20 of the present invention may use its outer periphery where the spider 20 is
connected with the frame 10 and / or the motor assemblies 12, 13, 14 as a flat outer leg shape,
or the spider 20 may use the frame 10. And / or its outer periphery connected with the motor
assemblies 12, 13, 14 may be used as the illustrated cup-like outer leg shape. The spider 20 of
the present invention may use the illustrated "neck-down" attachment for attachment of the
central opening 22 of the spider 20 to the coil former 16, or alternatively, the coil 4 of the
central opening 22 of the spider 20 may A “neck-up” attachment may be used for attachment
to the marker 16. The compliance of the spider 20 is more linear over the entire displacement
range of the spider 20 as the voice coil 17 moves within the air gap 15. Thus, non-linear or
harmonic distortion is reduced.
[0012]
Further, as shown in FIG. 4, a regressive roll or a regressive spiral shape may be employed for
the edge member 19 'of the multi-roll loudspeaker cone 18. The width of the flat portion
increases as the radius from the center line of the coil former 16 increases, or, in the case of the
multi-roll edge member 19 ′, as the distance from the outer periphery of the cone 18 increases.
, May be changed in other manners. For example, the width of the flats may decrease as the
radius from the center line of the coil foamer 16 increases, or as the distance from the outer
periphery of the cone increases. The width may be varied in some other manner, for example
pseudo-randomly.
[0013]
1 is a cross-sectional view of a loudspeaker constructed in accordance with the present invention.
Figure 2 is an enlarged view of a detail of the loudspeaker shown in Figure 1, generally at section
line 2-2 in Figure 1; FIG. 3 is a further enlarged cross-sectional view of the detail shown in FIG. 2
taken generally at section line 3-3 in FIG. 2; FIG. 7 is a partial enlarged cross-sectional view of
another loudspeaker constructed in accordance with the present invention;
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