| 摘要 |
PURPOSE:To improve the toughness of the lens by consisting the lens of an ultra-high mol. wt. acrylic resin having 300,000 weight average mol. wt., biaxially orienting the resin at >=2 times the stretching magnification by area under >=10kg/cm<2> average orientation release stress and forming the lens to <=0.8mm pitch. CONSTITUTION:The lenticular lens is formed by heating the sheet, which is formed by biaxially stretching the ultra-high mol. wt. acrylic resin having 300,000 weight average mol. wt. to >=2 times stretching magnification by area, to the temp. higher than the glass transition point of the acrylic resin by means of lenticular dies and pressurizing the sheet to compressively mold the sheet so as to substantially obviate the generation of shrinkage, cooling the sheet and taking the sheet out of the dies. The sheet is subjected to a high degree of the biaxial orientation under >=10kg/cm<2> average orientation release stress. The sheet is heated to the high temp. higher by >=20 deg.C than the glass transition point of the resin and is molded under pressurization in order to transfer the surface of the lenticular lens exactly from the die surface. The highly accurate lenticular lens having the high toughness is obtd. in this way. |
