EP0105099B1
Expired / Lapsed
EP
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Document with diffractive security pattern
Assignee: Siemens Building Technologies AG
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Filing: 1983-07-07
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Granted: 1986-01-29
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Expires: 2003-07-07
Abstract
Abstract A document includes a substrate which has an outer surface and defines a plane, and a coordinate system which is defined with respect to the plane. A diffraction-optical authenticating element covers at least part of the outer surface, and generates at least one color pattern constituting a visually testable feature which verifies the authenticity of the document. The diffraction-optical authenticating element provides a color pattern moving at a predetermined velocity along a predetermined track when the document is illuminated from a first direction and viewed from a second direction, as defined with respect to the coordinate system, upon the document being rotated within the plane along a prearranged sense of rotation, and at a prearranged velocity.
Inventors
- 👤 Gregor Antes
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 15:21
CPC Classifications
B; B42; B42D; B42D25/00; B42D25/30; B42D25/328; B42D25/20; B42D25/29; B42D25/40; B42D25/405; B42D25/41; G; G02; G02B; G02B5/00; G02B5/18; G02B5/1842; G03; G03H; G03H1/00; G03H1/26; G03H1/30; G06; G06K; G06K19/00; G06K19/06; G06K19/08; G06K19/10; G06K19/16; G07; G07F; G07F7/00; G07F7/08; G07F7/086; B42D2033/14; B42D2035/02; B42D2035/34; G03H1/0005; G03H1/0011; G03H1/02; G03H1/024; G03H1/0244; G03H1/04; G03H1/0476; G03H2001/0482; Y; Y10; Y10S; Y10S283/00; Y10S283/904
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
A document comprising a substrate and an optical-diffraction security element which covers at least a portion of the surface ofthe substrate and which has a diffraction structure which, by diffraction of incident light, produces at least one colour pattern which represents a visually detectable authenticity feature characterised in that the diffraction structure (4) is of such a kind that the colour pattern (10) which occurs with a given illumination and viewing direction (7; 9) moves along a predetermined path (B ; ), at locally predetermined speed, with respect to a coordinate system (x, y) which is fixedly connected to the substrate (2), when the substrate (2) is rotated in its plane in a given direction of rotation and at a given speed.
Claim 2
Dependent Claim
122 words
A document comprising a substrate and an optical-diffraction security element which covers at least a portion of the surface ofthe substrate and which has a diffraction structure which, by diffraction of incident light, produces at least one colour pattern which represents a visually detectable authenticity feature characterised in that the diffraction structure (4) is of such a kind that the colour pattern (10) which occurs with a given illumination and viewing direction (7; 9) moves along a predetermined path (B ; ), at locally predetermined speed, with respect to a coordinate system (x, y) which is fixedly connected to the substrate (2), when the substrate (2) is rotated in its plane in a given direction of rotation and at a given speed.
Claim 3
Dependent Claim
42 words
A document according to claim 1 characterised in that the diffraction structure (4) is of such a kind that at least one colour pattern (10) is produced in the situation of a perpendicular viewing direction (8), with any direction (7) of illumination.
Claim 4
Dependent Claim
35 words
A document according to claim 1 characterised in that the diffraction structure (4) is of such a kind that at least one colour pattern (10) is produced with any illumination and viewing direction (7; 9).
Claim 5
Dependent Claim
32 words
A document according to claim 1 characterised in that the optical-diffraction orientation of the diffraction structure (4) varies along the path of movement (B i ) in accordance with a predetermined law.
Claim 6
Dependent Claim
30 words
A document according to claim 1 characterised in that the spatial frequency of the diffraction structure (4) varies along the path of movement (B) in accordance with a predetermined law.
Claim 7
Dependent Claim
33 words
A document according to claim 4 or claim 5 characterised in that the diffraction structure (4) comprises a multiplicity of mutually adjoining structure elements (S) of different optical-diffraction orientation or different spatial frequency.
Claim 8
Dependent Claim
34 words
A document according to claim 4 or claim 5 characterised in that the optical-diffraction orientation or the spatial frequency of the diffraction structure (4) varies continuously along the path of movement (B i ).
Claim 9
Dependent Claim
20 words
A document according to claim 2 characterised in that the diffraction structure (4) has at least three different spatial frequencies.
Claim 10
Dependent Claim
30 words
A document according to claim 8 characterised in that the lowest spatial frequency is at least approximately 460 lines/mm and the highest spatial frequency is at least approximately 1400 lines/mm.
Claim 11
Dependent Claim
73 words
A document according to claim 6 and claim 8 characterised in that the structure elements (S) are diffraction gratings and that the grating constant of a first group of the diffraction gratings is at least approximately 0.7 pm, the grating constant of a second group of the diffraction gratings is at least approximately 1.2 µm and the grating constant of a third group of the diffraction gratings is at least approximately 2.2 µm.
Claim 12
Dependent Claim
126 words
A process for producing a document according, to claim 1 wherein an original diffraction structure which serves as an original for reproduction purposes is produced by irradiating a photosensitive substrate by means of a laser by interference of light beams characterised in that the beam path between the laser and the photosensitive substrate (17) is delimited by at least two movable light stops (14; 16) which are disposed one behind the other, that a movement of the first light stop (14) continuously produces new spatial frequencies and masks out existing spatial frequencies and that a movement of the second light stop (16) along a predetermined path (B;) produces a coherent interference pattern whose spatial frequency continuously varies along the path, in respect of magnitude and orientation.
References Cited (Backward Citations)
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