Even in case of conductive particles being clamped between stepped sections of substrate electrodes and electrode terminals, conductive particles sandwiched between each main surface of the substrate electrodes and electrode terminals are sufficiently compressed, ensuring electrical conduction. An electronic component is connected to a circuit substrate via an anisotropic conductive adhesive agent, on respective edge-side areas of substrate electrodes of the circuit substrate and electrode terminals of the electronic component, stepped sections are formed and abutted, conductive particles are sandwiched between each main surface and stepped sections of the substrate electrodes and electrode terminals; the conductive particles and stepped sections satisfy formula, a+b+c0.8 D (1), wherein a is height of the stepped section of the electrode terminals, b is height of the stepped section of the substrate electrodes, c is gap distance between each stepped sections and D is diameter of conductive particles.

Even in case of conductive particles being clamped between stepped sections of substrate electrodes and electrode terminals, conductive particles sandwiched between each main surface of the substrate electrodes and electrode terminals are sufficiently compressed, ensuring electrical conduction. An electronic component is connected to a circuit substrate via an anisotropic conductive adhesive agent, on respective edge-side areas of substrate electrodes of the circuit substrate and electrode terminals of the electronic component, stepped sections are formed and abutted, conductive particles are sandwiched between each main surface and stepped sections of the substrate electrodes and electrode terminals; the conductive particles and stepped sections satisfy formula, a+b+c0.8 D (1), wherein a is height of the stepped section of the electrode terminals, b is height of the stepped section of the substrate electrodes, c is gap distance between each stepped sections and D is diameter of conductive particles.

To reduce substrate warp occurring after connection an anisotropic conductive film is used. An anisotropic conductive film has: a first insulating adhesive layer; a second insulating adhesive layer; and a conductive particle-containing layer sandwiched by the first insulating adhesive layer and the second insulating adhesive layer and having conductive particles contained in an insulating adhesive, wherein air bubbles are contained between the conductive particle-containing layer and the first insulating adhesive layer, and, the conductive particle-containing layer, a portion thereof below the conductive particles and in contact with the second insulating adhesive layer has a lower degree of cure than other portions thereof.

To reduce substrate warp occurring after connection an anisotropic conductive film is used. An anisotropic conductive film has: a first insulating adhesive layer; a second insulating adhesive layer; and a conductive particle-containing layer sandwiched by the first insulating adhesive layer and the second insulating adhesive layer and having conductive particles contained in an insulating adhesive, wherein air bubbles are contained between the conductive particle-containing layer and the first insulating adhesive layer, and, the conductive particle-containing layer, a portion thereof below the conductive particles and in contact with the second insulating adhesive layer has a lower degree of cure than other portions thereof.

Even in case of conductive particles being clamped between stepped sections of substrate electrodes and electrode terminals, conductive particles sandwiched between each main surface of the substrate electrodes and electrode terminals are sufficiently compressed, ensuring electrical conduction. An electronic component is connected to a circuit substrate via an anisotropic conductive adhesive agent, on respective edge-side areas of substrate electrodes of the circuit substrate and electrode terminals of the electronic component, stepped sections are formed and abutted, conductive particles are sandwiched between each main surface and stepped sections of the substrate electrodes and electrode terminals; the conductive particles and stepped sections satisfy formula, a+b+c0.8 D (1), wherein a is height of the stepped section of the electrode terminals, b is height of the stepped section of the substrate electrodes, c is gap distance between each stepped sections and D is diameter of conductive particles.

Even in case of conductive particles being clamped between stepped sections of substrate electrodes and electrode terminals, conductive particles sandwiched between each main surface of the substrate electrodes and electrode terminals are sufficiently compressed, ensuring electrical conduction. An electronic component is connected to a circuit substrate via an anisotropic conductive adhesive agent, on respective edge-side areas of substrate electrodes of the circuit substrate and electrode terminals of the electronic component, stepped sections are formed and abutted, conductive particles are sandwiched between each main surface and stepped sections of the substrate electrodes and electrode terminals; the conductive particles and stepped sections satisfy formula, a+b+c0.8 D (1), wherein a is height of the stepped section of the electrode terminals, b is height of the stepped section of the substrate electrodes, c is gap distance between each stepped sections and D is diameter of conductive particles.

Even in case of conductive particles being clamped between stepped sections of substrate electrodes and electrode terminals, conductive particles sandwiched between each main surface of the substrate electrodes and electrode terminals are sufficiently compressed, ensuring electrical conduction. An electronic component is connected to a circuit substrate via an anisotropic conductive adhesive agent, on respective edge-side areas of substrate electrodes of the circuit substrate and electrode terminals of the electronic component, stepped sections are formed and abutted, conductive particles are sandwiched between each main surface and stepped sections of the substrate electrodes and electrode terminals; the conductive particles and stepped sections satisfy formula, a+b+c0.8 D (1), wherein a is height of the stepped section of the electrode terminals, b is height of the stepped section of the substrate electrodes, c is gap distance between each stepped sections and D is diameter of conductive particles.

Even in case of conductive particles being clamped between stepped sections of substrate electrodes and electrode terminals, conductive particles sandwiched between each main surface of the substrate electrodes and electrode terminals are sufficiently compressed, ensuring electrical conduction. An electronic component is connected to a circuit substrate via an anisotropic conductive adhesive agent, on respective edge-side areas of substrate electrodes of the circuit substrate and electrode terminals of the electronic component, stepped sections are formed and abutted, conductive particles are sandwiched between each main surface and stepped sections of the substrate electrodes and electrode terminals; the conductive particles and stepped sections satisfy formula, a+b+c0.8 D (1), wherein a is height of the stepped section of the electrode terminals, b is height of the stepped section of the substrate electrodes, c is gap distance between each stepped sections and D is diameter of conductive particles.

An anisotropic conductive film contains conductive particles and spacers. The spacers are arranged at a central part of the film in a width direction. The central part of the film in the width direction represents 20 to 80% of the overall width of the film. The height of the spacers in the thickness direction of the anisotropic conductive film is larger than 5 m and less than 75 m. Such an anisotropic conductive film has a layered structure having a first insulating adhesion layer and a second insulating adhesion layer, wherein the conductive particles are dispersed in the first insulating adhesion layer, and the spacers are regularly arranged on a surface of the first insulating adhesion layer on a side of the second insulating adhesion layer.

An anisotropic conductive film contains conductive particles and spacers. The spacers are arranged at a central part of the film in a width direction. The central part of the film in the width direction represents 20 to 80% of the overall width of the film. The height of the spacers in the thickness direction of the anisotropic conductive film is larger than 5 m and less than 75 m. Such an anisotropic conductive film has a layered structure having a first insulating adhesion layer and a second insulating adhesion layer, wherein the conductive particles are dispersed in the first insulating adhesion layer, and the spacers are regularly arranged on a surface of the first insulating adhesion layer on a side of the second insulating adhesion layer.