Patent ID: 6011618
Filing Date: 2000-01-04
Classification: G01N

Abstract:
A method of surface inspection of a disk adapted to move a disk from a loading station to an inspection station and then to an unloading station by indexing revolution of an indexing table having a number of chucks arranged angularly at regular intervals for respectively receiving disks by means of through holes formed in said disks respectively and holding said holes in order to inspect a surface of said disk, said method comprising:a loading step for loading said disk onto said chuck positioned at said loading station;a first transfer step for transferring said disk from said loading station to said inspection station by rotating said indexing table;an inspection step for inspecting said surface of said disk moved to said inspection station while driving said disk to rotate at a predetermined rate of revolution;a second transfer step for transferring said disk from said inspection station to said unloading station after end of inspection; anda start-up step for driving said disk to start revolving after having loaded said disk onto said chuck at said loading station and before arriving at said inspection station;thereby inspecting said surface of said disk brought to said inspection station while revolving.