Optical: systems and elements – Lens – With variable magnification
Patent
1998-10-05
2000-03-14
Epps, Georgia
Optical: systems and elements
Lens
With variable magnification
359676, 359683, 359684, 359686, G02B 1516
Patent
active
060380829
ABSTRACT:
A high-performance, inexpensive, small-size, and light-weight wide-angle zoom lens suitable for a TV camera is obtained, which comprises, successively from the object side, four groups having positive, negative, negative, and positive refracting powers, respectively, exhibits a half angle of view of about 40 degrees, and favorably corrects aberration. Successively disposed from the object side are a first lens group G.sub.1 having a positive refracting power functioning as a focusing part and comprising six sheets of lenses composed of a concave meniscus lens having a convex face directed onto the object side, a biconcave lens, a biconvex lens, a cemented lens made of concave and convex lenses, and a convex meniscus lens having a convex face directed onto the object side; a second lens group G.sub.2 functioning as a power-changing part and having a negative refracting power; a third lens group G.sub.3 having a negative refracting power for correcting the image face movement caused when changing power; and a fourth lens group G.sub.4 which is a relay lens group having a positive refracting power. When changing power from the wide-angle end to the telephoto end, the second and third lens groups G.sub.2 and G.sub.3 move on the optical axis, while the first and fourth lens groups G.sub.1 and G.sub.4 are fixed with respect to the image face.
REFERENCES:
patent: 4491395 (1985-01-01), Okudaria
patent: 5703725 (1997-12-01), Aoki
patent: 5760969 (1998-06-01), Suzuki
patent: 5831771 (1998-11-01), Suzuki
Epps Georgia
Fuji Photo Optical Co., Ltd.
Snider Ronald R.
Spector David N.
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