Patent ID: 9463600
Filing Date: 2016-10-11
CPC Classification: B29D

Claim Text:
1. A method of producing a composite optical element in which a transparent thermoplastic resin material is integrated with one surface of a transparent glass substrate by heating, the method comprising: a molding step of molding a composite optical element by integrating the transparent thermoplastic resin material with the one surface of the transparent glass substrate in a heated state; a cooling step of cooling the composite optical element prepared in the molding step to a first cooling temperature lower than a glass transition temperature of the transparent thermoplastic resin material; after the cooling step, a heating step of heating an interface layer of the transparent thermoplastic resin material, the interface layer contacting the transparent glass substrate, to a temperature equal to or higher than the glass transition temperature of the transparent thermoplastic resin material, by causing infrared light having a wavelength region in which an infrared absorptivity of the transparent thermoplastic resin material is higher than an infrared absorptivity of the transparent glass substrate to enter from a surface on the transparent glass substrate to the transparent thermoplastic resin material; and a stress removal step of cooling the composite optical element to a second cooling temperature lower than the first cooling temperature, wherein in the heating step, only a portion of the interface layer that is in contact with the transparent glass substrate is heated, and wherein the portion of the interface layer has a thickness of 10 μm to 450 μm.