ARBITRARY SURFACE OPTICAL ELEMENT AND METHOD OF MAKING THE SAME

摘要

An arbitrary surface optical element, such as a mirror for use in a rear projection television, includes a non optical portion (210) and an optical portion (220). The non optical portion (210) circumscribes the optical portion (220) and has a thickness greater than the optical portion. Accordingly, the two portions cool at approximately the same rate, thereby minimizing warpage from differential cooling.