Patent ID: 9685478
Date: 2017-06-20
CPC Classifications: H01L

Claim:
1. A flip-chip bonding method for bonding an electrode of an electronic component element to a connecting terminal of a substrate via a protrusion electrode, said flip-chip bonding method comprising: forming the protrusion electrode comprising plural electrically conductive bumps by at least: aligning the electronic component element with the substrate; and then while heating at least one of the electrode of the electronic component element and the connecting terminal of the substrate, bringing the electrode of the electronic component element into contact with the connecting terminal of the substrate via the protrusion electrode; and then deforming a part of the protrusion electrode by applying no ultrasonic vibration to the protrusion electrode but applying, to the protrusion electrode, a first pressure which is not less than a yield stress of a bulk material of which the protrusion electrode is made, and thereby deforming a part of the second bump by the application of the first pressure; reducing or stopping the application of the first pressure; and then while applying a given ultrasonic vibration to the protrusion electrode, gradually applying a pressure to the protrusion electrode until the pressure reaches a second pressure which is not less than the yield stress of the bulk material of which the protrusion electrode is made; in the forming of the protrusion electrode, the protrusion electrode being formed so that the first bump is formed on the electrode of the electronic component element or the second bump is formed on the connecting terminal of the substrate.