| 摘要 |
PURPOSE:To form plural lens parts which differ in smoke degree in a single-time molding process by calculating the smoke degree of each lens part from a relational equation regarding the relation with the thickness of each lens. CONSTITUTION:A lens 1 is molded out of a lens part 2 which has a low smoke degree and a lens part which has a large smoke degree in a single-time molding process. The smoke degree and thickness of the lens part 2 are denoted as Y1 and t1 and the smoke degree and thickness of the lens part 3 are denoted as Y2 and t2 respectively and the equation 1 is satisfied, thereby obtaining the lens 1 with a proper smoke degree.
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