3 results about "Reflection function" patented technology

This invention relates to a thin-film device for optical anti-counterfeiting, belonging to the field of anti-counterfeiting thin-film device design. The device includes a substrate layer; a plurality of micro-cylindrical reflective units, each cylindrical with its bottom surface adhered to the substrate layer; a ring-shaped textured area, also ring-shaped, disposed on the surface of the substrate layer and adhered to the side of the micro-cylindrical reflective units, the ring-shaped textured area being filled with a distorted texture corresponding to the source image to be displayed; and a reflective functional layer disposed on the side of the micro-cylindrical reflective units and in the area of ​​the non-ring-shaped textured area on the surface of the substrate layer, to achieve a specular reflection effect. The thin-film device constructed by this invention miniaturizes the macroscopic "cylindrical specular reflection imaging" system, achieving highly concealed information hiding and display on the thin-film device itself—"without the need for an external cylindrical mirror, the thin-film device itself is both a mirror and an image source"—within which information can be hidden and displayed with high concealment.

This invention proposes a high-flatness filter optimization method based on the synthesis of lossy filter coupling matrices, belonging to the field of wireless communication technology. The method includes the following steps: S1: Constructing the transmission and reflection functions of an Nth-order Chebyshev lossy filter; S2: Solving for the polynomials in the transmission and reflection functions of the Nth-order Chebyshev lossy filter; S3: Constructing the filter Y-parameter matrix based on the polynomials, ultimately obtaining the lossy filter coupling matrix; S4: Defining the passband flatness of the lossy filter coupling matrix; S5: Optimizing the passband flatness of the lossy filter coupling matrix using gradient optimization to obtain a filter coupling matrix with a high-flatness response; S6: Mapping the filter's physical structure parameters based on the high-flatness response filter coupling matrix. This invention, based on the lossy coupling matrix, obtains a passband-flat filter coupling matrix through gradient optimization, which can effectively guide the design of miniaturized high-performance filters.

This invention provides an optical anti-counterfeiting element and an optical anti-counterfeiting product. The optical anti-counterfeiting element includes a substrate; a reflective curved mirror array disposed on the substrate, the reflective curved mirror array having multiple reflective curved mirror units; a pattern microstructure formed on the reflective curved mirror units; a reflective functional layer disposed on the reflective curved mirror array, the reflective curved mirror array sampling and synthesizing the pattern microstructure to form a first pattern feature with a dynamic and three-dimensional effect; at least a portion of the reflective curved mirror units are arranged according to a preset rule in terms of height and / or period to form a second pattern feature containing preset graphic information. This invention solves the problem of difficult manufacturing processes for existing optical anti-counterfeiting elements.