CATADIOPTIC LENS WITH GLUED MENISCUS CORRECTOR Russian patent published in 2004 - IPC

FIELD: optical measurements.

SUBSTANCE: catadioptic lens has Cassegren system with spherical main and secondary mirrors and meniscus corrector which is installed in double ray path close to secondary mirror. Lenses of corrector are made of glass differing in refraction factor by 0,01-0,03 and in dispersion factor by 0,3-0,6. Lens standing first in the ray path behind main mirror is made of glass with higher refraction factor and lower dispersion factor. External radiuses of meniscus corrector are set to be equal in sign and absolute value. Surface of glued joint is flat. Lenses of corrector have equal axial thickness.

EFFECT: simplified process of lenses production; preserved quality of aberration quality.

2 dwg