Patent ID: 6354480
Filing Date: 2002-03-12
Classification: H01L

Abstract:
An apparatus for positioning a thin plate comprising:a stage having a flat placement surface on which said thin plate is mounted, said placement surface having a flat region which is slightly larger than and completely covers that of said thin plate, said placement surface also having at least one lateral side edge; optical detecting means arranged above said stage for detecting a mark provided on said thin plate, said optical detecting means having such a view that said mark can be caught by said view if said thin plate placed on said placement surface is within said flat region of the placement surface, but said mark cannot be caught by said view if said thin plate placed on said placement surface protrudes by a part thereof from said flat region of the placement surface; and adjusting means having a movable part which pushes said thin plate until it comes into contact with said lateral edge to move said thin plate so that said thin plate is brought within said flat region of the placement surface.