Patent ID: 6497193
Filing Date: 2002-12-24
Classification: C23C

Abstract:
A deposition system for substantially uniform deposition of an evaporant material onto a substrate comprising:(a) a source for generating a coherent energy beam; (b) a substantially planar target disposed in spaced relation to the substrate and defining a target plane, said target containing the evaporant material and being rotated about a target rotation axis substantially normal to said target plane; (c) a displaceable focusing element optically coupled to said source for focusing said coherent energy beam onto said target, said focused coherent energy beam having a focal point and defining an inpingement spot on said target; (d) an actuator coupled to said focusing element for reversibly translating said focusing element along a transverse scanning path directed substantially parallel to said target plane for displacing said impingement spot over said target during rotation thereof, said actuator being adapted to translate said focusing element in accordance with a predetermined rate profile based upon the position of said impingement spot relative to said target rotation axis, said actuator including an angularly displaceable contour; and, (e) whereby said focal point maintains a substantially constant distance from said target, said focus of said coherent energy beam on said target remains substantially preserved and an energy intensity of said coherent energy beam at said impingement spot remains substantially constant.