| 发明名称 |
MULTIFOCAL DIFFRACTIVE LENS |
| 摘要 |
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. |
| 申请公布号 |
AU3904389(A) |
申请公布日期 |
1990.02.15 |
| 申请号 |
AU19890039043 |
申请日期 |
1989.07.27 |
| 申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
JOHN ANDREW FUTHEY;WILLIAM BRUCE ISAACSON;RICKY LEE NEBY |
| 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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