发明授权
- 专利标题: Multifocal surface for a multifocal spectacle lens
- 专利标题(中): 多功能镜头的多功能表面
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申请号: US688111申请日: 1991-04-19
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公开(公告)号: US5137343A公开(公告)日: 1992-08-11
- 发明人: Gerhard Kelch , Hans Lahres , Helmut Wietschorke
- 申请人: Gerhard Kelch , Hans Lahres , Helmut Wietschorke
- 申请人地址: DEX Heidenheim
- 专利权人: Carl-Zeiss-Stiftung
- 当前专利权人: Carl-Zeiss-Stiftung
- 当前专利权人地址: DEX Heidenheim
- 优先权: DEX4012609 19900419
- 主分类号: G02C7/06
- IPC分类号: G02C7/06 ; G02C7/02
摘要:
The invention is directed to a multifocal surface for a multifocal lens which, for a short progression zone between a far-vision zone and near-vision zone, has a large usable width of this zone and the near-vision zone, and for which the maximum value, which the surface astigmatism reaches on the multifocal surface, is less than the 1.1 multiple of the surface increment. Such a multifocal surface is obtained when this surface is configured as twice continuously differentiable and satisfies a combination of six features which relate to the distribution of surface astigmatism and mean surface refractive power across the multifocal surface.
公开/授权文献
- US5643039A Game call with tuning clips 公开/授权日:1997-07-01