Arraye electromagnetic shielding optical window with concentric circular ring clusters and internally-tangent sub circular rings

Abstract

The invention discloses an array electromagnetic shielding optical window with concentric circular ring clusters and internally-tangent sub circular rings, and belongs to the technical field of electromagnetic shielding of optical transparent parts such as aerospace devices and advanced optical instruments. The array electromagnetic shielding optical window is characterized in that the concentric circular ring clusters composed of a plurality of circular rings of different diameters are arranged according to an equilateral triangle, tightly connected to form a metallic mesh and loaded on the surface of a transparent substrate of the optical window, external circular rings of the adjacent concentric circular ring clusters are tangent with each other, each concentric circular ring cluster is internally provided with sub circular rings, the sub circular rings are communicated with the external circular rings in an internally-tangent mode, a basic unit of the structure of the two-dimensional metallic mesh is composed of the sub circular rings and the external circular rings, and it is ensured that all the circular rings are mutually conductive at the positions where the circular rings are communicated with the sub circular rings in a tangent mode through line overlapping or the arrangement of metal capable of ensuring reliable electric linkage between tangency points of the metal rings. Compared with structures of existing metallic meshes, the structure of the metallic mesh can remarkably reduce inhomogeneity of high-level diffraction light distribution of the mesh, and reduce the influence of stray light caused by diffraction on the imaging quality.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding of optical transparent parts, in particular to an electromagnetic shielding light window with concentric ring clusters and inscribed sub-ring arrays. Background technique [0002] With the widening and increasing intensity of the electromagnetic wave application spectrum, the requirements for electromagnetic shielding optical windows used in aerospace equipment, advanced optical instruments, communication equipment, medical diagnostic instruments and security facilities are getting higher and higher, mainly requiring optical windows While having a super strong broadband electromagnetic shielding ability, it also has a very high light transmittance, and the less impact on optical imaging, observation, and detection, the better. For example, the optical windows of aircraft in the field of aerospace equipment must achieve high-quality isolation of electromagnetic signals inside and outside th...

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Problems solved by technology

[0019] The purpose of the present invention is to overcome the shortcomings of the above-mentioned existing optical window electromagnetic shielding technical solutions, especially for the existing single-layer grid metal grid, single-layer ring grid, double-layer grid and ring grid. To solve the problem of relatively concentrated stray light distribution caused by sub-diffraction, an electromagnetic shielding light window with concentric ring clusters and inscribed sub-ring arrays has been developed to achieve the purpose of depth homogenization of high-order diffraction and extremely low impact on imaging quality

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