G - Physics – 02 – B
Patent
G - Physics
02
B
88/99
G02B 3/00 (2006.01) G02B 13/24 (2006.01)
Patent
CA 1136461
82,704 CAN/JCB 6 mm ULTRA-FICHE LENS ABSTRACT A short focal length high magnification lens system for projecting ultra-fiche images having a large aperture with substantially diffraction 1imited resolution in the visual spectrum and a compact vertex-to-vertex distance of less than 50 mm comprising five lenses formed of 8 lens elements and a glass pressure plate to afford a focal length of 6 mm, with the elements on one side of the aperture having the same diameter and the elements on the rear of the aperture having the same diameter.
359427
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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