阅读说明：本技术 具有光学可变的表面图案的防伪元件 (Security element with optically variable surface pattern ) 是由 R.德梅尔 K.H.谢勒 M.R.J.谢勒 于 2020-05-08 设计创作，主要内容包括：本发明涉及一种用于为有价物品提供安全保障的防伪元件(12),其具有光学可变的表面图案(14),所述防伪元件在预设的观察角(16-A)以反射光观察时产生具有不同的亮度值的预设的灰度图像(18-A),其中,光学可变的表面图案(14)由多个基本上以辐射光学的方式作用的棱面(20)形成,所述棱面的横向尺寸小于100μm并且所述棱面的定向分别以相对于表面图案(14)的平面的倾斜角α和处于表面图案(14)的平面中的方位角为特征,其中,棱面的定向分别相应于配属的特征观察角(24),并且灰度图像(18-A)由光学可变的表面图案(14)的多个棱面(20)产生,其中,灰度图像(18-A)的不同的亮度值通过参与图像产生的棱面(20)的特征观察角(24)与预设的观察角(16-A)之间的不同大小的角差(δ)产生,其中,较小的角差相应于较亮的灰度并且较大的角差相应于较暗的灰度。(The invention relates to a security element (12) for securing valuable items, comprising an optically variable surface pattern (14) which, when viewed at a predetermined viewing angle (16-A) in reflected light, produces a predetermined gray-scale image (18-A) having different brightness values, wherein the optically variable surface pattern (14) is formed by a plurality of substantially radiation-optically active edge surfaces (20) having a transverse dimension of less than 100 [ mu ] m and having a width of less than 100 [ mu ] mThe orientation of the facets being at an inclination angle alpha relative to the plane of the surface pattern (14) and an azimuth angle in the plane of the surface pattern (14), respectively Is characterized in that the orientation of the facets corresponds in each case to an associated characteristic viewing angle (24), and in that a gray-scale image (18-A) is produced from a plurality of facets (20) of the optically variable surface pattern (14), wherein different brightness values of the gray-scale image (18-A) are produced by different angular differences (delta) of different magnitudes between the characteristic viewing angle (24) of the facets (20) involved in the image production and a predetermined viewing angle (16-A), wherein smaller angular differences correspond to brighter gray-scales and larger angular differences correspond to darker gray-scales.)

1. A security element for providing security to a valuable item, having an optically variable surface pattern, which security element, when viewed at a predetermined viewing angle in reflected light, produces a predetermined grey-scale image with different brightness values, wherein,

the optically variable surface pattern is formed by a plurality of substantially radiation-optically active facets, the lateral dimensions of which are less than 100 μm and the orientation of which is at an angle of inclination a relative to the plane of the surface pattern and at an azimuth angle lying in the plane of the surface pattern, respectivelyIs characterized in that the orientation of the edge surfaces corresponds to the associated characteristic viewing angle, respectively, and

the grey scale image is produced by a plurality of facets of the optically variable surface pattern,

the different brightness values of the gray-scale image are generated by different angular differences between the characteristic viewing angles of the facets involved in the image generation and the predefined viewing angle, wherein a smaller angular difference corresponds to a brighter gray scale and a larger angular difference corresponds to a darker gray scale.

2. A security element according to claim 1, characterized in that the facets are assigned a brightness value, preferably in terms of facets, by means of the angular difference between their characteristic viewing angle and a predetermined viewing angle, in particular in such a way that the facets have a maximum brightness for their characteristic viewing angle and a reduced brightness in relation to the angular difference for the predetermined viewing angle.

3. A security element according to claim 1 or 2, characterized in that the facets with a given angular difference have different combinations of azimuth angle and inclination angle in order to produce a given angular difference.

4. A security element according to claim 3, characterized in that the azimuth angles and/or inclination angles which produce a given angular difference are distributed irregularly, in particular randomly or quasi-randomly.

5. A security element according to claim 3, characterized in that the surface pattern is divided into a plurality of sections, wherein the facets with a given angular difference have the same azimuth angle and inclination angle in each section of the surface pattern, respectively, and wherein the azimuth angle and/or inclination angle advantageously differ significantly between different sections, so that sections outside the predetermined viewing angle appear in contrast to each other.

6. A security element as claimed in claim 5 in which the regions are designed in the form of a logo or design.

7. Security element according to at least one of claims 1 to 6,

the optically variable surface pattern produces a preset second gray scale image in a different preset second viewing angle in addition to the first gray scale image produced in the first viewing angle, wherein,

the first and second gray scale images are each produced from a plurality of facets of the optically variable surface pattern, wherein different brightness values of the first or second gray scale image are produced by different angular differences between the characteristic viewing angles of the facets respectively involved in the image production and the predetermined first or second viewing angles, wherein smaller angular differences correspond to brighter gray scales and larger angular differences correspond to darker gray scales.

8. A security element as claimed in claim 7, characterized in that the facets which respectively participate in the generation of the first or second gray scale image are arranged regularly, in particular in a grid-like staggered manner.

9. A security element according to claim 7, characterized in that the facets which respectively participate in the generation of the first or second gray scale image are arranged in an irregular, in particular random or quasi-random, distribution.

10. Security element according to at least one of claims 7 to 9, characterized in that the facets participating in the generation of the first gray-scale image each have a larger, preferably even the largest, angular difference with respect to the second viewing angle and, conversely, the facets participating in the generation of the second gray-scale image each have a larger, preferably even the largest, angular difference with respect to the first viewing angle.

11. A security element for providing security to a valuable item, having an optically variable surface pattern, which security element, when viewed at a predetermined viewing angle in reflected light, produces two or more predetermined grey-scale images having different brightness values, wherein,

the optically variable surface pattern is formed by a plurality of substantially radiation-optically active facets, the lateral dimensions of which are less than 100 μm and the orientation of which is at an angle of inclination a relative to the plane of the surface pattern and at an azimuth angle lying in the plane of the surface pattern, respectivelyIs characterized in that the orientation of the edge surfaces corresponds to the associated characteristic viewing angle,

each gray-scale image is generated from a plurality of facets of the optically variable surface pattern, wherein the different brightness values of an image point of the respective gray-scale image are generated by the area share of the facet associated with this image point, the characteristic viewing angle of the facet corresponding to the predetermined viewing angle of the gray-scale image, wherein a larger area share corresponds to a brighter gray-scale and a smaller area share corresponds to a darker gray-scale,

it is characterized in that the preparation method is characterized in that,

the characteristic viewing angles of those facets which do not correspond to the preset viewing angle of the gray-scale image correspond to a common, preset adjacent angle for all gray-scale images.

12. Security element according to at least one of claims 1 to 11, characterized in that the facets have a lateral dimension of less than 50 μm, preferably less than 30 μm, particularly preferably less than 15 μm.

13. Security element according to at least one of claims 1 to 12, characterized in that at least one predetermined gray-scale image has well-defined pattern regions with edge lines having a width of less than 100 μm, in particular less than 50 μm.

14. A data carrier having a security element as claimed in any one of claims 1 to 13.