发明名称 |
Wide-angle optical system, image pickup lens device, monitor camera, and digital apparatus |
摘要 |
A wide-angle optical system comprises a front lens group (11), and a rear lens group (12), with an aperture stop (13) interposed between. The front lens group (11) includes at least two negative lenses (111, 112) and at least one positive lens (113). At least one of the positive lenses included in the front lens group (11) has at least one aspherical surface. The front lens group (11) satisfies the conditional expression vdp<29 where vdp is the minimum value of the Abbe number of the positive lens(es) included in the front lens group (11).
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申请公布号 |
US8576501(B2) |
申请公布日期 |
2013.11.05 |
申请号 |
US20080679703 |
申请日期 |
2008.09.22 |
申请人 |
MATSUSAKA KEIJI;NAKATANI TORU;KONICA MINOLTA OPTO, INC. |
发明人 |
MATSUSAKA KEIJI;NAKATANI TORU |
分类号 |
G02B3/02;G02B9/06;G02B13/18 |
主分类号 |
G02B3/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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