| 摘要 |
PURPOSE:To permit fast casting of a resin and exact transfer and to brighten a lens by using a specific acrylate resin. CONSTITUTION:A lens layer consisting of the radiation curing type acrylate resin 6 is formed on the surface of a transparent flat plate-shaped base material 4. This resin 6 consists of 20-70wt.% acrylate (e.g.: ester expressed by the formula) which has respectively >=1 pieces of arom. rings and hydroxyl groups in the molecule and in which an acryloyl group is one piece 25-75wt.% acrylate (e.g.: ester expressed by the formula III) which has the structure expressed by the formula II in the molecule and has 2 acryloyl groups and 180-400mol.wt. and 5-55wt.% acrylate (e.g.: ester expressed by the formula IV) which has >=3 acryloyl groups in the molecule. The viscosity of this resin in the uncured state is specified to 1-150 centipoise and the refractive index thereof after curing to 1.50-1.55. In the formulas, R1, R2 denote alkyl or 1-4C; R3 denotes H, alkyl, etc.
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