Method of manufacturing lens, injection mold for molding of lens, and molded lens

  • US 6,210,610 B1
  • Filed: 07/17/1998
  • Issued: 04/03/2001
  • Est. Priority Date: 01/18/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. A lens producing method for molding a desired lens molding by solidifying a thermoplastic molten resin in a lens cavity which is formed in an injection molding die for molding a lens, in which the lens molding is molded by using the injection molding die for molding the lens in the lens cavity and a gate is Provided in the injection molding die as an inlet port for the molten resin flowed into the lens cavity which is open towards the lens cavity, the improvement comprising the step of changing the shape of an opening configuration of the gate in response to the molding of a minus lens having a thicker peripheral portion than a central portion thereof and the molding of a plus lens having a thinner peripheral portion than a central portion thereof.

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