Method for altering the coefficient of thermal expansion of a mirror
US5408362A · kind A · utility
2Cited by
7References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1993 |
| Grant date | Apr 18, 1995 |
| Priority date | — |
| Expiry date | Jun 22, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A front to back coefficient of thermal expansion difference between surfaces of a mirror segment is reduced by coating a selected surface. The other surface may be also coated in order to obtain an overall bulk coefficient of thermal expansion for the mirror segment. A plurality of mirror segments having coefficients of thermal expansion matched by coatings are selected for assembly thereby avoiding the need to physically change the positions of the various segments in order to bring them into correct relationship or to refocus the image using other optics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.