发明名称 |
Zoom lens system |
摘要 |
A zoom lens system according to the present invention comprises, from the object side to the image side, a first lens unit with a positive refractive power including a negative high dispersion lens element and a positive lens element; a second lens unit with a negative refractive power consisting of two or three lens elements including a positive high dispersion lens element and a negative lens element, and having at least one aspherical surface; and a third lens unit with a positive refractive power consisting of five or less lens elements including a negative high dispersion lens element and one or two positive lens elements located on the object side of the negative high dispersion lens element, and having at least one aspherical surface. With the lens arrangement, a compact high-zoom-ratio zoom lens system having a high aberration correction performance is realized.
|
申请公布号 |
US5543970(A) |
申请公布日期 |
1996.08.06 |
申请号 |
US19940197006 |
申请日期 |
1994.02.15 |
申请人 |
MINOLTA CAMERA KABUSHIKI KAISHA |
发明人 |
HATA, KAZUYOSHI;MAEKAWA, YUKIO;TAKAMOTO, KATSUHIRO;SAKA, MANAMI |
分类号 |
G02B15/173;(IPC1-7):G02B15/14;G02B13/18 |
主分类号 |
G02B15/173 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|