发明名称 |
PROGRAMMABLE SMOOTH JUNCTIONS ON LENSES |
摘要 |
Programmable smooth junctions are provided for lenses and molds therefor, particularly for toric lens designs, which enable a numerically controlled (NC) machine to be programmed to machine smooth junctions or transitions between adjacent regions of a lens which have different thicknesses or radii of curvature. First and second mathematical functions f(a) and f(b) are defined which specify the curves of first and second segments of a lens surface. The slope dy/dx is derived of the first and second mathematical functions f(a) and f(b) at the transition between the first and second segments of the lens surface. A mathematical function is defined which describes a desired transition between the first and second segments of the lens. The first and second mathematical functions f(a) and f(b), the derived slopes dy/dx of the first and second mathematical functions f(a) and f(b), and the mathematical function describing the desired transition are then utilized to program a numerically controlled machine to machine the first and second segments of the lens surface and the desired transition between the first and second segments.
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申请公布号 |
CA2175633(C) |
申请公布日期 |
2007.02.27 |
申请号 |
CA19962175633 |
申请日期 |
1996.05.02 |
申请人 |
JOHNSON & JOHNSON VISION PRODUCTS, INC. |
发明人 |
ROFFMAN, JEFFREY H.;CLUTTERBUCK, TIMOTHY A.;LEWIS, YULIN X. |
分类号 |
G02C7/04;G02C7/02;G02C7/06;G05B19/4097 |
主分类号 |
G02C7/04 |
代理机构 |
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