Anisotropic, conductive sheet and impedance measuring probe
View Patent ↗An anisotropically conductive sheet of the invention formed by containing conductive particles exhibiting magnetism in a sheet base composed of an elastic polymeric substance in a state dispersed in a plane direction thereof and oriented so as to align in a thickness-wise direction thereof. A thickness of the sheet is 10 to 100 μm, a number average particle diameter of the conductive particles exhibiting magnetism is 5 to 50 μm, a ratio W 1 /D of the thickness W 1 to the number average particle diameter D of the conductive particles exhibiting magnetism is 1.1 to 10, a content of the conductive particles exhibiting magnetism is 10 to 40% in terms of a weight fraction.
1. An anisotropically conductive sheet comprising:
conductive particles exhibiting magnetism in a sheet base including an elastic polymeric substance, said conductive particles in a state dispersed in a plane direction and oriented so as to align in a thickness-wise direction, wherein
a thickness of the sheet is 10 to 100 μm, a number average particle diameter of the conductive particles exhibiting magnetism is 5 to 50 μm, a ratio W 1 /D of the thickness W 1 to the number average particle diameter D of the conductive particles exhibiting magnetism is 1.1 to 10, a content of the conductive particles exhibiting magnetism is 10 to 40% in terms of a weight fraction, and a conductive substance exhibiting no magnetism is contained in a uniformly dispersed state.
2. An anisotropically conductive sheet comprising:
a sheet base including an elastic polymeric substance;
a plurality of conductive parts in the sheet, each of the plurality including conductive particles exhibiting magnetism at a high density and extending in a thickness-wise direction of the sheet base; and
an insulating part mutually insulating these conductive parts, wherein
a thickness of the conductive parts is 10 to 100 μm, a number average particle diameter of the conductive particles exhibiting magnetism is 5 to 50 μm, a ratio W 2 /D of the thickness W 2 of the conductive part to the number average particle diameter D of the conductive particles exhibiting magnetism is 1.1 to 10, a content of the conductive particles exhibiting magnetism in the conductive part is 10 to 40% in terms of a weight fraction, and
a conductive substance exhibiting no magnetism is included in the conductive parts and the insulating part in a uniformly dispersed state.
3. The anisotropically conductive sheet according to claim 2 , wherein the conductive part, which is connected to a circuit to be measured of a board to be measured, and the conductive part, which is connected to a ground circuit of the board to be measured, in an impedance-measuring probe are separated from each other by the insulating part.
4. An impedance-measuring probe comprising the anisotropically conductive sheet according to any one of claims 1 , 2 , or 3 , wherein the probe is used in a high-frequency region.
5. The anisotropically conductive sheet according to claims 1 , 2 , or 3 , wherein the sheet is used for impedance measurement in a high-frequency region.