PROJECTION OPTICAL SYSTEM Russian patent published in 2008 - IPC G02B26/08 

FIELD: optics.

SUBSTANCE: projection optical system has subject in form of spatial light modulator, which is shifted relatively optical axis of system for distance being equal at east to half size of subject itself; set of rotation-symmetrical optical members integrated by common axis of symmetry, which axis coincides with optical axis of system. Set of rotational-symmetric members has positive lens; group of optical members with at least single member made in form of diffraction lens; lens with two aspheric surfaces; aspheric mirror. Air spaces among members of projection system have to have the lengths to be capable of placing at least two flat mirror surfaces, which break optical axis to reduce thickness of display or TV set.

EFFECT: improved reliability of operation.

3 cl, 5 dwg, 2 tbl