Patent ID: 7145633

Claim:
An optical apparatus for exposing light on a surface of a spherical semiconductor device, comprising: a mask for providing a pattern of light through an exposure contour which undergoes temporal changes to collectively represent an image, the exposure contour being curved in opposition to a curvature of the surface of the spherical semiconductor device; a lens positioned to focus the pattern of light along a focal line across the surface of the spherical semiconductor device, wherein the exposure contour has a first width in a middle region of the focal line and is made progressively wider than the first width in both directions orthogonal to the focal line toward each end of the focal line to increase exposure time and achieve a substantially uniform intensity exposure across the curvature of the spherical semiconductor device; and a motor having a shaft coupled to the spherical semiconductor device for rotating the spherical semiconductor device in relation to the temporal changes in the pattern of light to expose the pattern of light over a portion of the surface of the spherical semiconductor device.