Optical: systems and elements – Lens – Fluid
Patent
1995-06-20
1997-06-10
Sugarman, Scott J.
Optical: systems and elements
Lens
Fluid
359666, G02B 106, G02B 312
Patent
active
056382154
ABSTRACT:
A high performance, large aperture, long focal length visible waveband objective lens system (60) comprises a telephoto objective lens group (48) spaced from a focusing lens group (49) and an auxiliary lens group (54), all supported in a support assembly (43) of fixed length. The lens groups are aligned on a common optical axis (40) and arranged to form a real image (34) in image space (42) from radiation entering the system (60) from a real object in object space (41). The telephoto objective lens group (48) is stationary and comprises a positively powered lens element (A) and a negatively powered lens sub-group (50) containing a quintuplet lens group (51) with lens elements (B, C, D, E, F) and a lens element (G). The quintuplet lens group includes two lens elements (C and E) of liquid materials which exhibit highly abnormal partial dispersions and one solid glass lens element (F) which exhibits slightly abnormal partial dispersion In addition, the liquid materials of lens elements (C) and (E) exhibit very large changes in refractive index with temperature and the material of lens element (F) exhibits a compensating large change in refractive index with temperature. The remaining lens elements of the system are common optical glass and exhibit substantially normal partial dispersions.
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patent: 5204782 (1993-04-01), Mercado et al.
patent: 5446591 (1995-08-01), Medlock
Panavision International L.P.
Sugarman Scott J.
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