Patent ID: 7683482

Claim:
An electronic component unit comprising: an electronic component having a first electrode and a bump on said first electrode; a circuit board having a second electrode electrically connected to said first electrode via said bump after said bump is crushed; and an insulating resin layer between said electronic component and said circuit board, said insulating resin layer including an insulating resin mixed with an inorganic filler, wherein said insulating resin layer has a first end portion, a second end portion and a middle portion, each of said first and second end portions and said middle portion being parallel to said circuit board, wherein said first end portion is in contact with said electronic component and said second end portion is in contact with said circuit board, with said middle portion being arranged between said first and second end portions in a thickness direction of said insulating resin layer so as to be in contact with said first and second end portions, wherein said middle portion has an amount of said inorganic filler that is greater than an amount of said inorganic filler in each of said first and second end portions, a total amount of said inorganic filler gradually varying from said middle portion to said first and second end portions such that the amount of said inorganic filler in said middle portion is not clearly distinguished from the amount of said inorganic filler in said each of said first and second end portions, and wherein said bump is crushed during bonding of said electronic component to said circuit board.