Patent ID: 7432129
Filing Date: 2008-10-07
Classification: B23K,H01L

Abstract:
1. A method of bonding a semiconductor chip, comprising: positioning and placing in contact bumps or pads formed on one side of a semiconductor chip and pads or bumps formed on a mounting surface of a substrate, which correspond to the bumps or pads of the semiconductor chip; contacting a contact body, which is connected to a first ultrasonic vibrator capable of vibrating at a first predetermined frequency and a second ultrasonic vibrator capable of vibrating at a second predetermined frequency, to the semiconductor chip; applying ultrasonic vibration of a first predetermined frequency, by vibrating the first ultrasonic vibrator, to the semiconductor chip to make the bumps or pads of the semiconductor chip and the pads or bumps of a substrate rub against each other to level the bumps; and applying ultrasonic vibration of a second predetermined frequency, by vibrating the second ultrasonic vibrator, that differs from the first predetermined frequency, to the semiconductor chip, via the contact body, to simultaneously bond the bumps and the pads of the semiconductor chip and the substrate, wherein the ultrasonic vibration, which is applied to the contact body by the first and second ultrasonic vibrators, is in the form of compressional waves, the first ultrasonic vibrator and the second ultrasonic vibrator are connected to the contact body from different directions, such that the ultrasonic vibration of the first predetermined frequency, which is applied by the first ultrasonic vibrator during the leveling, and the ultrasonic vibration of the second predetermined frequency, which is applied by the second ultrasonic vibrator during the bonding, are set to progress in different directions, a length of the contact body in the wave direction of the ultrasonic vibration of the first predetermined frequency applied by the first ultrasonic vibrator is set as a natural number multiple of the wavelength of the ultrasonic vibration of the first predetermined frequency, and a length of the contact body in the wave direction of the ultrasonic vibration of the second predetermined frequency applied by the second ultrasonic vibrator is set as a natural number multiple of the wavelength of the ultrasonic vibration of the second predetermined frequency.