Optical: systems and elements – Lens – With variable magnification
Patent
1990-11-13
1993-06-08
Sugarman, Scott J.
Optical: systems and elements
Lens
With variable magnification
359715, 359716, 359717, G02B 1514, G02B 1318
Patent
active
052184781
ABSTRACT:
A zoom lens comprises, from front to rear, a first lens unit of positive power and a second lens unit of negative power with the limitation of the total number of lens elements to 4 or less, the first and second lens units axially moving in differential relation to effect zooming. By properly setting the refractive power arrangement of all the lens units and the spacings between the lens elements and by introducing an aspheric surface, the zoom lens is well corrected for high optical performance, although the total number of lens elements is few.
REFERENCES:
patent: 4400064 (1983-08-01), Ikamori et al.
patent: 4469412 (1984-09-01), Tajima et al.
patent: 4560253 (1985-12-01), Ogino
patent: 4953957 (1990-09-01), Kobayashi
patent: 5071235 (1991-12-01), Mori et al.
Canon Kabushiki Kaisha
Sugarman Scott J.
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