| 摘要 |
PURPOSE:To provide the titled lens with a small lens part having a resin layer with the gradient of a refractive index and having different refractive indexes by integrally laminating 1st-3rd synthetic resin layers having respectively different refractive indexes and forming a specific recessed part. CONSTITUTION:The 1st synthetic resin layer (master lens) 1 having a constant refractive index, the 2nd synthetic resin layer 2 indicating a refractive index different from that of the 1st layer 1 and the 3rd synthetic resin layer 3 existing between these layers 1, 2 and having refractive index gradient changing its refractive index continuously from the 1st layer to the 2nd layer are integrally laminated. A part of the 2nd and 3rd synthetic resin layers 2, 3 is integrally recessed to the 1st layer 1 and the 2nd layer is thickened on the recessed part as compared to the other part. Thus, the small lens part 4 provided with the resin layer having the refractive index gradient and formed by the resin layers 2, 3 having refractive indexes different from that of the 1st layer 1 can be formed.
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