US 8,783,728 B2 · Endless material for security elements

A method for manufacturing endless material for security elements having micro-optical moiré magnification arrangements that exhibit a motif grid comprising a plurality of micromotif elements and a focusing element grid comprising a plurality of microfocusing elements for moiré-magnified viewing of the micromotif elements, the method comprising:

a) providing a motif grid comprising an at least locally periodic arrangement of micromotif elements in the form of a first one- or two-dimensional lattice,
b) providing a focusing element grid comprising an at least locally periodic arrangement of a plurality of microfocusing elements in the form of a second one- or two-dimensional lattice,
c) specifying a pattern repeat of the motif grid and/or of the focusing element grid on the endless material,
d) determining whether the lattice of the motif grid and/or the lattice of the focusing element grid repeats periodically in the specified pattern repeat, and if not, determining a linear transformation that distorts the first and/or the second lattice such that it repeats periodically in the specified pattern repeat, and
e) for the further manufacture of the endless material, replacing the motif grid or the focusing element grid by the motif grid that is distorted by the determined linear transformation, or the focusing element grid that is distorted by the determined linear transformation,
wherein, in step c), a pattern repeat q along the endless longitudinal direction of the endless material is specified,
wherein, in step d), a lattice point P of the first and/or the second lattice is selected that lies near an endpoint Q of a vector
(
0
q
)
given by the longitudinal pattern repeat, and a linear transformation V is determined that maps P to Q.

9 more elements

A method for manufacturing endless material for security elements having micro-optical moiré magnification arrangements that exhibit a motif grid comprising a plurality of micromotif elements and a focusing element grid comprising a plurality of microfocusing elements for moiré-magnified viewing of the micromotif elements, the method comprising:

a) providing a motif grid comprising an at least locally periodic arrangement of micromotif elements in the form of a first one- or two-dimensional lattice,
b) providing a focusing element grid comprising an at least locally periodic arrangement of a plurality of microfocusing elements in the form of a second one- or two-dimensional lattice,
c) specifying a pattern repeat of the motif grid and/or of the focusing element grid on the endless material,
d) determining whether the lattice of the motif grid and/or the lattice of the focusing element grid repeats periodically in the specified pattern repeat, and if not, determining a linear transformation that distorts the first and/or the second lattice such that it repeats periodically in the specified pattern repeat, and
e) for the further manufacture of the endless material, replacing the motif grid or the focusing element grid by the motif grid that is distorted by the determined linear transformation, or the focusing element grid that is distorted by the determined linear transformation,
wherein, in step c), a pattern repeat q along the endless longitudinal direction of the endless material is specified,
wherein, in step c), a pattern repeat b along the transverse direction of the endless material is specified,
wherein, in step d),
a lattice point P of the first and/or the second lattice is selected that lies near the endpoint Q of the vector
(
0
q
)
given by the longitudinal pattern repeat,
a lattice point A of the first and/or the second lattice is selected that lies near the endpoint B of the vector
(
b
0
)
given by the transverse pattern repeat, and
a linear transformation V is determined that maps P to Q and A to B.

18 more elements

A method for manufacturing endless material for security elements having micro-optical moiré magnification arrangements that exhibit a motif grid comprising a plurality of micromotif elements and a focusing element grid comprising a plurality of microfocusing elements for moiré-magnified viewing of the micromotif elements, the method comprising:

a) providing a motif grid comprising an at least locally periodic arrangement of micromotif elements in the form of a first one- or two-dimensional lattice,
b) providing a focusing element grid comprising an at least locally periodic arrangement of a plurality of microfocusing elements in the form of a second one- or two-dimensional lattice,
c) specifying a pattern repeat of the motif grid and/or of the focusing element grid on the endless material,
d) determining whether the lattice of the motif grid and/or the lattice of the focusing element grid repeats periodically in the specified pattern repeat, and if not, determining a linear transformation that distorts the first and/or the second lattice such that it repeats periodically in the specified pattern repeat, and
e) for the further manufacture of the endless material, replacing the motif grid or the focusing element grid by the motif grid that is distorted by the determined linear transformation, or the focusing element grid that is distorted by the determined linear transformation,
wherein the first and second lattice are one-dimensional translation lattices.

3 more elements

A method for manufacturing endless material for security elements having micro-optical moiré magnification arrangements that exhibit a motif grid comprising a plurality of micromotif elements and a focusing element grid comprising a plurality of microfocusing elements for moiré-magnified viewing of the micromotif elements, the method comprising:

a) providing a motif grid comprising an at least locally periodic arrangement of micromotif elements in the form of a first one- or two-dimensional lattice,
b) providing a focusing element grid comprising an at least locally periodic arrangement of a plurality of microfocusing elements in the form of a second one- or two-dimensional lattice,
c) specifying a pattern repeat of the motif grid and/or of the focusing element grid on the endless material,
d) determining whether the lattice of the motif grid and/or the lattice of the focusing element grid repeats periodically in the specified pattern repeat, and if not, determining a linear transformation that distorts the first and/or the second lattice such that it repeats periodically in the specified pattern repeat, and
e) for the further manufacture of the endless material, replacing the motif grid or the focusing element grid by the motif grid that is distorted by the determined linear transformation, or the focusing element grid that is distorted by the determined linear transformation,
wherein the first and second lattice are two-dimensional Bravais lattices,
the method further comprising:
defining a desired image that is visible when viewed and has one or more moiré image elements, the arrangement of magnified moiré image elements being chosen in the form of a two-dimensional Bravais lattice whose lattice cells are given by vectors {right arrow over (t)}1 and {right arrow over (t)}2,
providing the focusing element grid in step b) as an arrangement of microfocusing elements in the form of a two-dimensional Bravais lattice whose lattice cells are given by vectors {right arrow over (w)}1 and {right arrow over (w)}2, and
in step a), calculating the motif grid having the micromotif elements using the relationships
U
↔
=
W
↔
·
(
T
↔
+
W
↔
)
-
1
·
T
↔
and
r
->
=
W
↔
·
(
T
↔
+
W
↔
)
-
1
·
R
->
+
r
->
0
,
wherein
R
->
=
(
X
Y
)
represents an image point of the desired image,
r
->
=
(
x
y
)
an image point of the motif grid,
r
->
0
=
(
x
0
y
0
)
a displacement between the arrangement of microfocusing elements and the arrangement of micromotif elements, and the matrices , and are given by
T
↔
=
(
t
11
t
12
t
21
t
22
)
,
W
↔
=
(
w
11
w
12
w
21
w
22
)
⁢
⁢
and
⁢
⁢
U
↔
=
(
u
11
u
12
u
21
u
22
)
,
with t1i, t2i, u1i, u2i and w1i, w2i representing the components of the lattice cell vectors , {right arrow over (u)}i and {right arrow over (w)}i, where i=1, 2.

124 more elements

A method for manufacturing endless material for security elements having micro-optical moiré magnification arrangements that exhibit a motif grid comprising a plurality of micromotif elements and a focusing element grid comprising a plurality of microfocusing elements for moiré-magnified viewing of the micromotif elements, the method comprising:

a) providing a motif grid comprising an at least locally periodic arrangement of micromotif elements in the form of a first one- or two-dimensional lattice,
b) providing a focusing element grid comprising an at least locally periodic arrangement of a plurality of microfocusing elements in the form of a second one- or two-dimensional lattice,
c) specifying a pattern repeat of the motif grid and/or of the focusing element grid on the endless material,
d) determining whether the lattice of the motif grid and/or the lattice of the focusing element grid repeats periodically in the specified pattern repeat, and if not, determining a linear transformation that distorts the first and/or the second lattice such that it repeats periodically in the specified pattern repeat, and
e) for the further manufacture of the endless material, replacing the motif grid or the focusing element grid by the motif grid that is distorted by the determined linear transformation, or the focusing element grid that is distorted by the determined linear transformation,
wherein the first and second lattice are two-dimensional Bravais lattices,
the method further comprising:
defining a desired image that is visible when viewed and has one or more moiré image elements,
providing the focusing element grid in step b) as an arrangement of microfocusing elements in the form of a two-dimensional Bravais lattice whose lattice cells are given by vectors {right arrow over (w)}1 and {right arrow over (w)}2,
defining a desired movement of the visible image when the moiré magnification arrangement is tilted laterally and when tilted forward and back, the desired movement being specified in the form of the matrix elements of a transformation matrix, , and
in step a), calculating the motif grid having the micromotif elements using the relationships
U
↔
=
(
I
↔
-
A
↔
-
1
)
·
W
↔
and
r
↔
=
A
↔
-
1
·
R
->
+
r
->
0
,
wherein
R
->
=
(
X
Y
)
represents an image point of the desired image,
r
->
=
(
x
y
)
an image point of the motif image,
r
->
=
(
x
0
y
0
)
a displacement between the arrangement of microfocusing elements and the arrangement of micromotif elements, and the matrices , and are given by
A
↔
=
(
a
11
a
12
a
21
a
22
)
,
W
↔
=
(
w
11
w
12
w
21
w
22
)
⁢
⁢
and
⁢
⁢
U
↔
=
(
u
11
u
12
u
21
u
22
)
,
with u1i, u2i and w1i, w2i representing the components of the lattice cell vectors {right arrow over (u)}i and {right arrow over (w)}i, where i=1, 2.

113 more elements

Endless material for security elements

Life of this patent

Endless material for security elements

Life of this patent

Abstract

Claims66