Anisotropic conductive sheet and its manufacturing method
AssigneeJ.S.T. Mfg. Co., Ltd.
InventorMiki Hasegawa
Life of this patent
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Abstract
An anisotropic conductive sheet interposed between a circuit board such as a substrate and various circuit parts to render them conductive and its manufacturing method. The anisotropic conductive sheet has a fine pitch required by the recent highly integrated circuit boards and electronic parts, and exhibits conductivity in only the direction of thickness of the sheet due to the use of conductive thin layers such as of a metal which does not slip out. The anisotropic conductive sheet (10) includes conductive thin layers (30) that are scattering in the direction of plane of the anisotropic conductive sheet (10) and are penetrating through in the direction of thickness of the anisotropic conductive sheet (10).
Claims14
An anisotropic conductive sheet expanding on a first plane, wherein when a first direction contained in said first plane is denoted as X-direction, a direction orthogonal X-direction and contained in said first plane is denoted as Y-direction and a direction orthogonal to X-direction and Y-direction is denoted as Z-direction, wherein said anisotropic conductive sheet has a predetermined thickness in Z-direction and a front surface and a back surface substantially in parallel with said first plane, the anisotropic conductive sheet comprising:
- a nonconductive matrix expanding on said first plane;
- and
- conductive thin layers scattered in said nonconductive matrix with two surfaces spaced apart across a predetermined thickness, at least one of the two surfaces being arranged in contact with said nonconductive matrix, wherein
- in said conductive thin layers each conductive thin layer comprises at least a set comprising a flexible layer and a good conductive layer, extending in the Z-direction and penetrating throughout from the front surface to the back surface.
An anisotropic conductive sheet expanding on a first plane, wherein when a first direction contained in said first plane is denoted as X-direction, a direction orthogonal to X-direction and contained in said first plane is denoted as Y-direction and a direction orthogonal to X-direction and Y-direction is denoted as Z-direction, wherein the anisotropic conductive sheet has a predetermined thickness in Z-direction and a front surface and a back surface substantially in parallel with said first plane being spaced apart across said predetermined thickness, the anisotropic conductive sheet comprising:
- strip-like members with conductive thin layers extending in X-direction, the strip-like members with the conductive thin layers being composed of nonconductive strip-like members having thickness in Z-direction and width in Y-direction and extending in X-direction;
- and
- the conductive thin layers being adhered to side surfaces of said nonconductive strip-like members substantially along Z-direction and having narrow width in X-direction along the side surfaces of said nonconductive strip-like members and extending from the front surface to the back surface of the anisotropic conductive sheet penetrating therethrough in Z-direction,
- wherein said strip-like members with the conductive thin layers being positioned and coupled to each side of each strip-like member so as to line up in Y-direction, and
- wherein in said conductive thin layers, each conductive thin layer comprises at least a set comprising a flexible layer and a good conductive layer, extending in the Z-direction and penetrating throughout from the front surface to the back surface.
Dependencies are inferred from the claim text.