| 发明名称 |
Multi-focal diffractive ophthalmic lenses. |
| 摘要 |
<p>A multifocal ophthalmic lens has optical power, at least a portion of the optical power being produced by diffraction. The lens has a plurality of diffractive zones including a circular central zone and a plurality of concentric annular zones. The central zone has a radius r0 and the first annular zone has a radius r1 where r1<2> - r0<2> is not equal to r0<2>.</p> |
| 申请公布号 |
EP0335731(A2) |
申请公布日期 |
1989.10.04 |
| 申请号 |
EP19890303198 |
申请日期 |
1989.03.31 |
| 申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
SIMPSON, MICHAEL J. C/O MINNESOTA MINING AND;FUTHEY, JOHN A. C/O MINNESOTA MINING AND |
| 分类号 |
A61F2/16;G02B5/18;G02C7/04;G02C7/06 |
主分类号 |
A61F2/16 |
| 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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