Another Look at Open Back Zerodur Primary Mirrors (OBZ PMs). Robert Besuner 12 May 2005. Evolution as of 2 weeks ago. Mounting is near 2/3 radius rather than peripheral. Offloading schemes are better optimized. Cathedral ribs behind front face sheet to reduce gravity and polishing quilting.
12 May 2005
Present tapered-back design
SAGEM design—basis for early OBZ studies
Present tapered-back design—202mm cells
Tapered-back design from 2 weeks ago—294mm cells