
{"publication_number": "US-6366410-B1", "abstract": "a rema objective is realized by introduction of a few aspherical surfaces of high - quality correction with a low number of lenses , and low path in glass of the object - reticle distance , thus enhancing efficiency .", "application_number": "US-12562199-A", "description": "the embodiment example of a rema objective with the lens section of fig1 has the data of table 1 . it consists of a condenser portion 100 , constructed as a partial objective , in front of the aperture diaphragm 8 , an intermediate portion 200 , and a field lens portion 300 . the rema objective has an image field diameter greater than 80 mm and an image side numerical aperture of greater than 0 . 10 mm . an aspheric element 7 , 11 , 17 is provided in each of these portions . thus the rema objective has only seven lenses . the planar surfaces 9 and 14 have only a positioning function . a deflecting mirror ( 240 in fig2 ) can be arranged in the region of 14 . p ( h )={ h 2 / r +( r 2 \u2212( 1 + k ) h 2 )