A two lens unit zoom lens of plus, minus configuration where the rear negative group provides the primary variator function and the positive first lens unit consists of a negative sub-unit and a positive sub-unit and where the sub-units may move differentially during zooming.
申请公布号
USRE35775(E)
申请公布日期
1998.04.21
申请号
US19920904373
申请日期
1992.06.25
申请人
BETENSKY, ELLIS I.;KREITZER, MELVYN H.;MOSKOVICH, JACOB
发明人
BETENSKY, ELLIS I.;KREITZER, MELVYN H.;MOSKOVICH, JACOB