发明名称 |
Lens system having a good image performance for white light |
摘要 |
A lens system has a lens unit comprising a positive lens and a negative lens. The positive lens has an index distribution in the direction of the optic axis. The value of the index gradient for a light having a short wavelength in the vicinity of the vertex of at least one convex surface of the positive lens is smaller than the value of the index gradient for a light having a long wavelength.
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申请公布号 |
US4810070(A) |
申请公布日期 |
1989.03.07 |
申请号 |
US19860901059 |
申请日期 |
1986.08.26 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
SUDA, SHIGEYUKI;HATTORI, JUN;KITAGISHI, NOZOMU;NAKAYAMA, HIROKI;HORIUCHI, AKIHISA |
分类号 |
G02B9/00;G02B3/00;G02B9/02;G02B15/16;G02B15/167;G02B15/173;(IPC1-7):G02B3/00;G02B15/14 |
主分类号 |
G02B9/00 |
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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