Dai Nippon Printing Co., Ltd.

Dai Nippon Printingco., Ltd.

Yukihiro Kyoden

Fumihiro Arakawa

Daisuke Hashimoto

Yasuhiko Ishii

Eiji Ohishi

Tetsuya Ojiri

Kazuhito Fujii

Eiji Oishi

An electromagnetic wave shielding materialcomprises a light-shielding electrical conductor layerhaving, on its observer-side external surface, a blackening layer. The electrical conductor layercomprises a mesh portionthat has a large number of openings adjoining one another and faces the center portionof the image-luminescent partof a display device, and a frame portionthat surrounds the mesh portionand faces the outer edge portionof the image-luminescent partof the display device. When trimming the screen of a display D with a black-colored light-shielding layer, since the electromagnetic wave shielding materialis used, it is not necessary to performan additional printing step or the like, so that the total number of steps and material cost are not increased. Moreover, such electromagnetic wave shielding material does not cause non-uniformity in light-shielding properties compared with a light-shielding layer formed by printing. The frame portionincludes a light-transmitting pattern parthaving patterned openings

Electromagnetic wave shielding material and display using the same

An electromagnetic shielding sheet is capable of shielding electromagnetic radiation generated by a display, has a proper transparency and uniformly distributed meshes, prevents the occurrence of white and/or black spot defects and linear defects and glaring, and ensures the satisfactory visibility of images. The electromagnetic shielding sheet has a conductive structure () having lines () having straight parts of widths (W) in the range of C(1&#xb1;30%), where C is a predetermined value. The radius (r) of curvature of a side surface (S) extending between the upper side (U) and the lower side (B) of a bank in a section of the lines () in a plane perpendicular to the transparent sheet meet a condition expressed by: 1.5t&#x2266;r&#x2266;3.0t, where t is the thickness of the conductive structure ().

Electromagnetic shielding sheet

An electromagnetic wave shielding filterincludes a meshed layer, wherein at least one of the front and back surfaces of the meshed layer is subjected to a blackening treatment to be a blackened face having micro-irregularities. The shape of the micro-irregularities is adjusted to have a probability density curve with a peak point being convex upward wherein the probability density curve is defined as a curve depicted in a graph in which the change of height from the peak value Rp to the bottom value Rv of the deepest valley is shown as the horizontal axis while the probability density expressing the distribution of height is shown as the vertical axis. Also, in the probability density curve, a horizontal tangent can be drawn at its peak point.

Electromagnetic wave shielding filter

An electromagnetic shielding sheet of the present invention includes a transparent base sheet and a metal layer attached to one surface of the transparent base sheet. The metal layer has a mesh part, a peripheral mesh part surrounding the mesh part, and a grounding frame surrounding the peripheral mesh part. A width of lines forming meshes in the peripheral mesh part gradually increases from the mesh part toward the grounding frame. The lines of the electromagnetic shielding sheet are scarcely bent or broken in all processes including fabricating and assembling processes, and the electromagnetic shielding sheet is excellent in handling ease.

An electromagnetic shielding sheetincludes: a transparent base, and at least an adhesive layer, an antirust layerA and a mesh metal layerformed on one of the surfaces of the base. A blackened layerA is sandwiched between the mesh metal layerand the antirust layerA. At least openingsof the mesh metal layerare filled up with a resin such that the mesh metal layerhas a substantially flat surface.

An electromagnetic wave shielding sheet includes a transparent substrateand a metal layerprovided on one surface of the transparent substratethrough an adhesive layerThe metal layerincludes a mesh partand a frame partsurrounding the mesh partThe frame partincludes at least one transparent partthat is a metal-layer-free area. Preferably, the transparent partincludes a metallic portionin a geometric pattern. Light transmitted by or reflected from the transparent partis detected, thereby the transparent partcan be used as a register mark for detecting the position of the mesh part

Electromagnetic wave shielding sheet, front panel, and display

A metallic foil and a transparent substrate film are laminated with an adhesive layer. The roughness of the adhesive-layer-side surface (lower surface) of the metallic foil is such that the maximum height Rmax is more than 0 and less than 4 &mgr;m. As long as the maximum height Rmax falls in the range, the adhesive layer never contains air bubbles in such sizes that reflectance is adversely affected. The roughness of the surface (upper surface) of the metallic foil, opposite the adhesive-layer-side surface, is preferably such that the arithmetic mean roughness Ra is between 0.02 &mgr;m and 1 &mgr;m. As long as the arithmetic mean roughness Ra is in this range, it is possible to efficiently conduct vacuuming to bring, into close contact, a photosensitive resin layer and a photomask in sheet form placed on the photosensitive resin layer, before effecting the pattern-wise exposure of the photosensitive resin layer.

Growing community of inventors

Shinjuku-ku, Japan

Yukihiro Kyoden