US 8,786,521 B2Granted

Representation system

AssigneeGiesecke & Devrient GmbH

InventorsWittich Kaule, Michael Rahm, Wolfgang Rauscher

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Abstract

The present invention relates to a depiction arrangement for security papers, value documents, electronic display devices or other data carriers, having a raster image arrangement for depicting a planar target image that is given by an image function f(x,y), having a motif image that is subdivided into a plurality of cells (24), in each of which are arranged imaged regions of the target image a viewing grid (22) composed of a plurality of viewing elements for reconstructing the target image when the motif image is viewed with the aid of the viewing grid (22), the motif image exhibiting, with its subdivision into a plurality of cells, an image function m(x,y).

Claims50

Dependent claims

A security element for security papers, value documents, or other non-transitory data carriers, the security element comprising:

(A) a motif layer including a motif image that is subdivided into a plurality of cells, in each of which are arranged imaged regions of a planar target image defined by an image function f(x,y),
(B) a viewing grid composed of a plurality of viewing elements for reconstructing the target image when the motif image is viewed with the aid of the viewing grid,
the motif image of the motif layer having an image function m(x,y) that is given by
m
⁡
(
x
,
y
)
=
f
⁡
(
(
x
y
)
+
(
A
⁡
(
x
,
y
)
-
I
)
·
(
(
(
(
x
y
)
+
w
d
⁡
(
x
,
y
)
)
⁢
mod
⁢
⁢
W
)
-
w
d
⁡
(
x
,
y
)
-
w
c
⁡
(
x
,
y
)
)
)
·
g
⁡
(
x
,
y
)
⁢
⁢
⁢
where
⁢
⁢
w
d
⁡
(
x
,
y
)
=
W
·
(
d
1
⁡
(
x
,
y
)
d
2
⁡
(
x
,
y
)
)
⁢
⁢
and
⁢
⁢
w
c
⁡
(
x
,
y
)
=
W
·
(
c
1
⁡
(
x
,
y
)
c
2
⁡
(
x
,
y
)
)
,
such that the planar target image is reconstructed when the motif image of the motif layer is viewed through the viewing grid;
wherein
a unit cell of the viewing grid being described by lattice cell vectors
w
1
=
(
w
11
w
21
)
⁢
⁢
and
⁢
⁢
w
2
=
(
w
12
w
22
)
and combined in the matrix
W
=
(
w
11
w
12
w
21
w
22
)
,
the matrix
A
⁡
(
x
,
y
)
=
(
a
11
⁡
(
x
,
y
)
a
12
⁡
(
x
,
y
)
a
21
⁡
(
x
,
y
)
a
22
⁡
(
x
,
y
)
)
describes a desired magnification and movement behavior of the reconstructed planar target image,
the vector (c1(x,y), c2(x,y)), where 0≦c1(x,y),c2(x,y)<1, indicates position of the center of the viewing elements relative to the cells of the motif image of the motif layer,
the vector (d1(x,y), d2(x,y)), where 0≦d1(x,y), d2(x, y)<1, represents a location-dependent displacement of cell boundaries of the plurality of cells in the motif image of the motif layer,
g(x,y) is a mask function for adjusting visibility of the reconstructed planar target image, and
wherein the reconstructed planar target image either exhibits no periodicity, or exhibits a periodicity that is described by a 2×2 matrix P, wherein the periodicity unit cell is not equal to (A−I) W.

237 more elements

A security element for security papers, value documents, or other non-transitory data carriers, the security element comprising:

(A) a motif layer having a motif image that is subdivided into a plurality of cells, in each of which are arranged imaged regions of a plurality of planar target images that are given by image functions fi(x, y), i=1, 2, . . . n, where n≧1,
(B) a viewing grid composed of a plurality of viewing elements for reconstructing the planar target images when the motif layer is viewed with the aid of the viewing grid,
the motif image of the motif layer having, an image function m(x, y) that is given by m(x,y)=F(h1, h2, . . . hn), having the describing functions
h
i
⁡
(
x
,
y
)
=
f
i
⁡
(
(
x
y
)
+
(
A
i
⁡
(
x
,
y
)
-
I
)
·
(
(
(
(
x
y
)
+
w
di
⁡
(
x
,
y
)
)
⁢
mod
⁢
W
)
-
w
di
⁡
(
x
,
y
)
-
w
ci
⁡
(
x
,
y
)
)
)
·
g
i
⁡
(
x
,
y
)
⁢
where
⁢
⁢
w
di
⁡
(
x
,
y
)
=
W
·
(
d
i
⁢
⁢
1
⁡
(
x
,
y
)
d
i
⁢
⁢
2
⁡
(
x
,
y
)
)
⁢
⁢
and
⁢
⁢
w
ci
⁡
(
x
,
y
)
=
W
·
(
c
i
⁢
⁢
1
⁡
(
x
,
y
)
c
i
⁢
⁢
2
⁡
(
x
,
y
)
)
,
such that the plurality of planar target images are reconstructed when the motif image is viewed through the viewing grid;
wherein:
F(h1, h2, . . . hn) is a master function that indicates an operation on the n describing functions hi(x, y),
a unit cell of the viewing grid being described by lattice cell vectors
w
1
=
(
w
11
w
21
)
⁢
⁢
and
⁢
⁢
w
2
=
(
w
12
w
22
)
and combined in the matrix
W
=
(
w
11
w
12
w
21
w
22
)
,
the matrices
A
i
⁡
(
x
,
y
)
=
(
a
i
⁢
⁢
11
⁡
(
x
,
y
)
a
i
⁢
⁢
12
⁡
(
x
,
y
)
a
i
⁢
⁢
21
⁡
(
x
,
y
)
a
i
⁢
⁢
22
⁡
(
x
,
y
)
)
each describe a desired magnification and movement behavior for the reconstructed planar target image fi,
the vectors (ci1(x, y), ci2(x, y)), where 0≦ci1(x, y), ci2(x, y)<1, indicate in each case, for the target image fi, the relative position of the center of the viewing elements within the cells i of the motif layer,
the vectors (di1(x, y), di2(x, y)), where 0≦di1(x, y), di2(x, y)<1, each represent a location-dependent displacement of the cell boundaries in the motif image of the motif layer,
gi(x, y) are mask functions for adjusting the visibility of the reconstructed planar target image fi, and
wherein at least one of the reconstructed planar target images either exhibits no periodicity, or exhibits a periodicity that is described by a 2×2 matrix P, wherein the periodicity unit cell is not equal to (A−I) W.

264 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/665,078Filed 25 Jun 2008
Priority: DE 10 2007 029 20325 Jun 2007
Published: US 2010/0182221 A122 Jul 2010
Granted: 22 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

B42D 25/342
Identification or security features, e.g. for preventing forgery: moiré effects
B42D 25/00
Information-bearing cards or sheet-like structures characterised by identification or security features
B42D 25/21
Characterised by a particular use or purpose: for multiple purposes
B42D 25/29
Characterised by a particular use or purpose: securities; Bank notes

Family

US 2010/0182221 A1Pre-grant publication · published 22 Jul 2010
US 8,786,521 B2This patent

From the US filing history. Foreign family members aren’t listed.

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