发明名称 |
Small sized zoom lens |
摘要 |
A zoom lens including a first lens unit of positive power and a second lens unit of negative power with the axial separation therebetween varies to bring about zooming. The first lens unit includes at least one positive lens and at least one negative lens and the second lens unit consists of a forwardly concave negative meniscus lens, thereby making the lens system small.
|
申请公布号 |
US4815830(A) |
申请公布日期 |
1989.03.28 |
申请号 |
US19840643820 |
申请日期 |
1984.08.23 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
SATO, YASUHISA;YAMADA, YASUYUKI;NAKAYAMA, HIROKI |
分类号 |
G02B15/16;(IPC1-7):G02B15/14 |
主分类号 |
G02B15/16 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|