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.
Another Look at Open Back Zerodur Primary Mirrors (OBZ PMs)
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