Patent ID: 7641099

Claim:
A solder joint determination method for determining a solder joint condition between an electronic part and a piece of solder with a laser beam irradiating the electronic part, said electronic part having an electrode mounted on a circuit board by the solder, said solder joint determination method comprising: scanning a surface of the electrode with the laser beam; measuring a height of the electrode relative to the circuit board from data of the scanning of the electrode; scanning a surface of the solder near the electrode with the laser beam; measuring a height of the solder relative to the circuit board from data of the scanning of the solder; and determining the solder joint condition between the electronic part and the solder based on the measured height of the electrode relative to the circuit board, the measured height of the solder relative to the circuit board, and a calculated distance of a bottom surface of the electrode from the circuit board that is calculated based on the measured height of the electrode relative to the circuit board.