31results about How to "Does not affect the electromagnetic shielding effect" patented technology

The invention relates to a triangular and orthogonal hybrid-distributed circular ring and sub circular ring array-based electromagnetic shielding optical window and belongs to the technical field of electromagnetic shielding. Metal circular rings with the same diameter which are adopted as basic circular rings and are in equilateral triangle and two-dimensional orthogonal hybrid distribution and connected with one another closely, are loaded on the surface of a transparent substrate of the optical window; adjacent basic circular rings are communicated with one another in an externally tangent manner; connection lines of the centers of the adjacent basic circular rings form equilateral triangles or squares; metal sub circular rings which are communicated with each basic circular ring in an internally tangent manner are arranged inside the corresponding basic circular ring, wherein the metal sub circular rings and the corresponding basic circular ring form a basic unit of a two-dimensional grid array structure; joints of places where the circular rings are communicated with one another in an tangent manner are subjected to line overlapping or are provided with metal which can ensure reliable electric connection among metal ring tangent points, such that all circular rings can electrically communicate with one another. With the metal grid structure of the invention adopted, the heterogeneity of high-order diffraction light intensity distribution can be significantly reduced, and the distribution of stray light caused by diffraction can be more uniform, and imaging is lightly affected.

The invention discloses an array electromagnetic shielding optical window with three-period externally-tangent circular rings and internally-tangent sub circular rings, and belongs to the technical field of electromagnetic shielding. The three kinds of metal circular rings of different diameters are used as basic circular rings, connecting circular rings and filling circular rings respectively, arranged according to an equilateral triangle or according to shared vertexes of a regular hexagon or according to shared edges of the regular hexagon to form a metallic mesh and loaded on the surface of an optical transparent substrate. The metal circular rings of the same diameter are separated from each other. The outer side of each basic circular ring is provided with six connecting circular rings distributed at equal intervals and provided with six filling circular rings distributed at equal intervals, wherein the six connecting circular rings are communicated with the corresponding basic circular ring in an externally-tangent mode, and the filling circular rings are communicated with the adjacent connecting circular rings in an externally-tangent mode. The basic circular rings are internally provided with the internally-tangent sub circular rings. It is ensured that all the circular rings are mutually conductive at the positions where the circular rings are communicated 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. According to the metallic mesh, due to the combined action of the three-period externally-tangent circular rings and the internally-tangent sub circular rings, inhomogeneity of distribution of stray light caused by high-level diffraction of the mesh can be remarkably reduced.

The invention relates to a crossed triangular distribution metal circular ring array electromagnetic shielding light window with internally tangent sub circular rings, and belongs to the technical field of electromagnetic shielding. Two kinds of metal circular rings with different diameters are respectively and tightly connected and ranged and are distributed in a crossed way according to the equilateral triangle arrangement to form a two-dimensional metal mesh grid to be loaded on the surface of a transparent substrate of the light window, and the adjacent circular rings with the same diameters are communicated in an externally tangent way, wherein the sub circular rings communicated in the internally tangent way are arranged inside the circular rings with one diameter, and the circular rings and the sub circular rings communicated in the internally tangent way jointly form a basic unit of the two-dimensional metal mesh grid; at internally-tangent communicated connection parts of the circular rings, all circular rings are enabled to be mutually communicated for realizing electric conduction through line overlapping or through installation of metal capable of ensuring reliable electric connection between metal annular tangent points. Compared with the existing metal mesh grid structure, the metal mesh grid structure provided by the invention has the advantages that the nonuniformity of the mesh grid high-grade-order diffraction light intensity distribution can be obviously reduced, the distribution of stray light caused by diffraction is more uniform, and the influence on the imaging is less.

The invention discloses an orthogonal circular ring and sub circular ring array electromagnetic shielding optical window with externally-tangent connecting circular rings, and belongs to the technical field of electromagnetic shielding. Two kinds of metal circular rings of different diameters are used as basic circular rings and the connecting circular rings respectively, tightly connected to form a two-dimensional metallic mesh, and loaded on the surface of a transparent substrate of the optical window. The basic circular rings are orthogonally arranged in a two-dimensional mode and separated from each other in the arrangement direction at equal intervals. A connecting unit is composed of every two connecting circular rings communicated in an externally-tangent mode, and the connecting units are perpendicularly, alternately and orthogonally arranged in a two-dimensional mode. The separated basic circular rings are connected through the connecting units. The basic circular rings are internally provided with sub circular rings communicated with the basic circular rings in an internally-tangent mode, and a basic unit of the structure of the two-dimensional mesh is composed of the basic circular rings and the sub circular rings. It is ensured that all the circular rings are mutually conductive at the positions where the circular rings are communicated 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. According to the structure of the metallic mesh, inhomogeneity of high-level diffraction light distribution of the mesh can be remarkably reduced, so that distribution of stray light caused by diffraction is more even, and the influence on imaging is smaller.

The electromagnetic shielding light window of the two-dimensional orthogonal distribution array of concentric rings with inscribed sub-rings belongs to the technical field of electromagnetic shielding of optical transparent parts. A group of concentric metal rings are closely arranged in two-dimensional orthogonal arrangement to form a metal grid and loaded On the surface of the transparent substrate of the light window, the diameters of the outer rings of each pair of concentric rings are equal, and the adjacent outer rings are circumscribed and communicated; Sub-rings, pairs of concentric rings and their inscribed sub-rings together form the basic unit of a two-dimensional metal grid; the diameter of each ring is on the order of millimeters and submillimeters, and the width of lines is on the order of microns and submicrons; For tangentially connected joints, overlap the lines or set metals that ensure reliable electrical connection between the tangent points of the metal rings, so as to ensure that all the rings are connected to each other and conduct electricity. The metal grid structure of the invention can significantly reduce the inhomogeneity of the high-order diffraction light intensity distribution of the grid, and make the stray light distribution caused by diffraction more uniform.

The invention provides an electromagnetic shielding structure of a photomultiplier tube, comprising the following steps: a shielding layer and an insulating layer are sequentially arranged on the periphery of the tube body of the photomultiplier tube. The shielding layer is in contact with the pipe wall of the pipe body to shield the electric field and the magnetic field of the pipe body, and theinsulating layer wraps the shielding layer to encapsulate and isolate the shielding layer. The shielding layer is connected with the corresponding pin of the photomultiplier tube, and the shielding layer is a single layer structure made of permalloy material. The structure can reduce the thickness of the encapsulation shielding layer without affecting the electromagnetic shielding effect, so thatthe encapsulation process is more simple and the shielding effect is more reliable.