Patent ID: 6956963
Filing Date: 2005-10-18
Classification: G01B,G01N,G03F,G06T,H01L

Abstract:
1. A machine-vision head for measuring a three-dimensional geometry of a device having a surface to be measured, comprising: a projector, the projector including: an imager, the imager having a reception optical axis that intersects the device substantially at the projection optical axis, wherein the projection-pattern element light-modulation pattern includes a repeating pattern of grid lines having substantially constant density along lines in a direction parallel to the grid lines and a sine-wave density along lines in a direction perpendicular to the grid lines, wherein the first light source includes a elongated incandescent filament having a dimension along a longitudinal axis substantially longer than a width, wherein the longitudinal axis of the filament is substantially perpendicular to the projection optical axis and substantially parallel to the grid lines of the projection-pattern element; and a projection mask having an elongated aperture having a dimension along a length axis substantially longer than a dimension along a width axis perpendicular to the length axis, and wherein the length axis is substantially parallel to the grid lines of the projection-pattern element, wherein the projection mask limits the projected light to less than about three sine-wave cycles of the sine-wave pattern.