| 摘要 |
The lens consists of sub-assemblies (5, 6) which are moulded one onto the other and have coupling elements (51,61) on adjacent edges which extend along the plane of the lens. The coupling elements comprise a male section (54) on one of the sub-assemblies and a matching female section (54) on the other one. The coupling elements are situated on straight zones of the lens sub-assembly adjacent edges, and there are no such coupling elements on the edges which are curved or have corners. The male coupling element has, in cross-section, a flat surface (540) lying parallel to the plane of the lens, and a curved surface (541) which extends from the straight edge parallel to the plane of the lens, joining the flat surface from a perpendicular direction. |
