Patent ID: 6493059
Filing Date: 2002-12-10
Classification: G03F,H05K

Abstract:
An apparatus for exposing a double-sided printed circuit board to light through an artwork, the apparatus comprising:a structure; a first artwork-support frame fixed relative to the structure at all times during a production cycle and defining a horizontal mounting plane; a vertical drive mechanism disposed over the first frame, comprising a mounting surface attached to a vertically movable driver, the vertically movable driver immobile in directions parallel to the horizontal mounting plane; a second artwork-support frame movable in all directions mounted to the mounting surface; a plurality of bearings vertically supporting the second frame on the mounting surface, whereby substantially frictionless movement of the second frame in a plane parallel to the horizontal mounting plane is permitted during vertical movement of the second frame; and alignment features disposed on the first frame and the second frame, each alignment feature comprising a pair of members configured to cooperate in mating relationship to align the second frame relative to the first frame in directions parallel to the horizontal mounting plane when the second frame is moved towards the first frame, a first member of the pair mounted to the first frame, and a second member of the pair mounted to the second frame.