Patent ID: 6405610
Filing Date: 2002-06-18
Classification: B25J,H01L

Abstract:
A wafer inspection apparatus comprising:a setting surface on which a cassette member is mounted, the cassette member storing wafers; an observation system that inspects each of the wafers in the cassette member at a predetermined observation position; and a first convey system having a first arm portion that individually conveys wafers from the cassette member to a first position and having a second arm portion that individually conveys wafers from a second position to the cassette member; a second convey system that conveys the wafers from the first position to the predetermined observation position and conveys the wafers from the predetermined observation position to the second position; wherein the first position and the second position are separated from each other along a vertical axis perpendicular to a surface of each wafer in the first and second positions, and wherein wafers positioned at said first and second positions overlie one another.