Optical: systems and elements – Lens – With variable magnification
Patent
1995-01-13
1996-06-18
Sugarman, Scott J.
Optical: systems and elements
Lens
With variable magnification
359684, G02B 1514
Patent
active
055284272
ABSTRACT:
A zoom lens having five groups. A first lens group has a positive refractive power; a second lens group has a negative refractive power; a third lens group has a positive refractive power; a fourth lens group has a negative refractive power; and a fifth lens group has a positive refractive power. The first through fifth lens groups are arranged in this order from the object side. A varifocal zooming operation is performed by changing a distance interval between respective lens groups and the second lens group is moved to perform a focusing operation.
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patent: 5136430 (1992-08-01), Hamanishi
Kobayashi Masahito
Ogawa Hideki
Tanaka Tsunefumi
Canon Kabushiki Kaisha
Sugarman Scott J.
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