Patent ID: 6511363
Filing Date: 2003-01-28
Classification: B24B

Abstract:
A polishing end point detecting device for a wafer polishing apparatus, the polishing end point detecting device comprising:a light source; a light guide at an illuminating side which conducts light outputted from said light source onto a polishing face of a wafer so as to illuminate the polishing face; a light guide at a light receiving side which conducts the light being reflected on the polishing face of said wafer after having been conducted from said light guide at the illuminating side onto the polishing face of said wafer; a spectroscope which splits the light conducted by said light guide at the light receiving side into lights for corresponding wavelengths; a photoelectric converting device which converts the light having been split by said spectroscope into electric signals corresponding with a light intensity of each of the wavelengths, and outputs the converted lights as light intensity signals for the corresponding wavelengths; and an end point determination device which determines a polishing end point in accordance with the light intensity signals for the corresponding wavelengths that have been outputted from said photoelectric converting device; wherein one end of said light guide at the illuminating side and one end of said light guide at the light receiving side are combined.