Patent ID: 8247701

Claim:
An anisotropic electroconductive film comprising: an electroconductive particle placement sheet comprising electroconductive particles and an insulating resin sheet having a reference plane P 1 and a reference plane P 2 opposite thereto; and an insulating adhesive layer laid on at least one side of the electroconductive particle placement sheet; wherein a thickness of the insulating resin sheet of the electroconductive particle placement sheet is smaller than an average particle diameter of the electroconductive particles, the electroconductive particles protrude from at least the reference plane P 1 on one side of the insulating resin sheet, and the portion of the electroconductive particles protruding from the reference plane P 1 of the insulating resin sheet is covered with a coating layer formed of the same resin as the insulating resin that forms the insulating resin sheet; a relation h 1 >h 2 is satisfied wherein an average of a distance between the reference plane P 1 and a tangential line L 1 of the electroconductive particles which is parallel to the reference plane P 1 and tangential to the portion of the electroconductive particles, protruding from the reference plane P 1 is defined as an average protrusion height h 1 (h 1 >0), and an average of a distance between the reference plane P 2 and a tangential line L 2 of the electroconductive particles which is parallel to the reference plane P 2 and is located on the opposite side of the electroconductive particles from the tangential line L 1 is defined as an average protrusion height h 2 (provided that h 2 <0 if the tangential line L 2 is located within the insulating resin sheet, h 2 =0 if the tangential line L 2 is located on the reference plane P 2 , and h 2 >0 if the tangential line L 2 is located outside the insulating resin sheet); and a melt viscosity of the insulating resin sheet at 180° C. is 10 Pa·s or more and 5×10 4 Pa·s or less.