| 摘要 |
PURPOSE:To prevent bubbles from being entrapped and consequently contrive to enhance the production efficiency of the lens sheet concerned by a method wherein a nozzle having delivery ports is arranged between lens mold and transparent base material so as to deliver ultraviolet-curing resin liquid in order to fill said resin liquid in a gap by shifting the nozzle. CONSTITUTION:A lens mold 1 is arranged so as to be sloped at 5-30 deg. from the horizontal. Further, a transparent base material 2 is opposed against the lens mold in such a manner that the gap between the mold and the base material is larger at the upper part of the slope of the lens mold 1 than at its lower part. At this time, the gap at the lower part does not be set to zero. Any nozzle having continuous small bore delivery ports, slit-like openings or delivery ports on both sides of a tube will do. The diameter of a port, width of a slit and number of port or slit are prepared in response to the viscosity of ultraviolet-curing resin liquid used. The spreading of the resin is performed by shifting the nozzle 4 to the lower part of the slope, starting the delivery the resin liquid and pressing the transparent base material 2 with a roll 5 while gradually shifting the nozzle to the upper part of the slope. When the nozzle reaches the upper end of the slope, the delivery of the resin liquid is stopped and the nozzle is drawn out and excess resin liquid 3 is run out with the roll 5 and, after that, the lens mold 1 is brought into the horizontal. Then, ultraviolet rays are irradiated 8 onto the transparent base material 2 from above so as to harden the resin in order to take lens sheet out of the transparent base material. |
