Optical: systems and elements – Lens – With variable magnification
Patent
1993-11-05
1996-05-14
Epps, Georgia Y.
Optical: systems and elements
Lens
With variable magnification
359693, 359694, 359700, 359701, G02B 1514
Patent
active
055173616
ABSTRACT:
A zoom lens system, with both zooming and focusing functions, has a plurality of lens groups including at least two focusing lens groups which move differently from each other either in zooming or in focusing, wherein when a certain movement trace for zooming is expressed with a variable of rotation angle of a rotating barrel for defining a displacement amount of a lens group along an optical axis, a movement trace of the first focusing lens group is formed by a combination of a first focus cam with a first compensating zoom cam, a movement trace of an n-th focusing lens group is formed by a combination of an n-th focus cam with an n-th compensating zoom cam, and a movement trace of each movable non-focusing lens group taking no part in focusing is formed by a combination of one of the first to n-th compensating zoom cams with a zoom cam for the non-focusing lens group.
REFERENCES:
patent: 4729644 (1988-03-01), Ueyama
patent: 4963006 (1990-10-01), Inadome
patent: 5018843 (1991-05-01), Inadome et al.
patent: 5144490 (1992-09-01), Yamanouchi
patent: 5151729 (1992-09-01), Takayama
patent: 5337187 (1994-08-01), Fukino et al.
Patent Abstracts of Japan, vol. 13, No. 422, (P-933), 20 Sep. 1989 (JP-A-01 154 110).
Inadome Kiyotaka
Kanno Hideo
Nakatsuji Masahiro
Sato Haruo
Epps Georgia Y.
Lester Evelyn A.
Nikon Corporation
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