1983-05-27
1985-12-03
Corbin, John K.
G02B 1302
Patent
active
045562954
ABSTRACT:
An ultracompact telephoto eight-group ten-element or eight-group eleven-element lens comprises, in order from an object, a front four-group four-element lens group including a first positive lens having a surface of a smaller radius of curvature directed toward the object, a second positive lens having a surface of a smaller radius of curvature directed toward the object, a third double-concave lens, and a fourth positive-meniscus lens having a surface of a smaller radius of curvature directed toward the object, an intermediate three-group five-element lens group including a compound lens composed of a fifth negative lens and a sixth double-convex lens, a compound lens composed of a seventh negative lens and an eighth double-convex lens, and a ninth negative lens having a surface of a smaller radius of curvature directed toward the object, and a rear lens group including a single tenth positive lens or a positive compound lens composed of a tenth positive lens and an eleventh negative lens.
REFERENCES:
patent: 4176913 (1979-12-01), Nakamura et al.
patent: 4206971 (1980-06-01), Hamanishi et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Corbin John K.
Dzierzynski P. M.
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