Patent ID: 9427919
Filing Date: 2016-08-30
CPC Classification: B29C,B29D

Claim Text:
1. An optical element producing method for shaping a resin by sandwiching the resin between a pair of molds, comprising the steps of: (1) applying the resin to one of the pair of molds; (2) causing the other of the pair of molds and the resin to contact with each other and curing the resin until the temperature of the resin reaches a gel point; and (3) curing the resin, the step (3) including starting, at a time when the temperature of the resin reaches the gel point, control of the position of the one and/or the other of the pair of molds so that pressure exerted from the resin to the other of the pair of molds, which resin is curing and shrinking, is kept at a predetermined pressure; the pressure exerted from the resin to the other of the pair of molds is monitored throughout the step (2); at detection of a state in which the pressure exerted to the other of the pair of molds is a negative pressure, the step (2) is switched to the step (3); and in the step (3), the position of the one and/or the other of the pair of molds is controlled so that the pressure exerted to the other of the pair of molds is increased to a predetermined positive pressure and thereafter the positive pressure maintained.