| 发明名称 |
Multifocal diffractive lens. |
| 摘要 |
<p>A multifocal ophthalmic lens has a plurality of concentric diffractive zones with adjacent zones separated by steps having predetermined heights. Each step has an outer corner and each outer corner has a radius of curvature equal to at least one half the height of the step associated therewith.</p> |
| 申请公布号 |
EP0354786(A2) |
申请公布日期 |
1990.02.14 |
| 申请号 |
EP19890308111 |
申请日期 |
1989.08.09 |
| 申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
FUTHEY, JOHN A. C/O MINNESOTA MINING AND;ISAACSON, WILLIAM B. C/O MINNESOTA MINING AND;NEBY, RICKY L. C/O MINNESOTA MINING AND |
| 分类号 |
G02C7/04;G02B5/18;G02C7/06 |
主分类号 |
G02C7/04 |
| 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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