Infrared absorbing polarized eyeglass lens
An infrared absorbing polarized eyeglass lens substrate includes a polarizing element including a polarizing film and a polyurethane resin material containing an infrared absorbing agent and covering both surfaces of the polarizing film, and an eyeglass lens substrate made of a polyurethane resin not containing an infrared absorbing agent and configured to be ground for adjusting lens power. The polarizing element is superposed on one side of the eyeglass lens substrate and integrated therewith by insert molding which accompanies polymerization reaction of the polyurethane resin material.
1. An infrared absorbing polarized eyeglass lens comprising:
a polarizing element comprising a polarizing film and a polyurethane resin material containing an infrared absorbing agent and covering two surfaces of the polarizing film; and
an eyeglass lens substrate made of a polyurethane resin not containing an infrared absorbing agent and configured to be ground for adjusting lens power, the polarizing element being superposed on one side of the eyeglass lens substrate and integrated therewith by insert molding which accompanies polymerization reaction of the polyurethane resin material.
2. The lens of claim 1 , wherein the polyurethane resin material comprises a prepolymer obtained by reacting polyisocyanate with a polyhydroxy compound, and further contains an aromatic polyamine as a curing agent.
3. The lens of claim 2 , wherein the prepolymer is a polyurethane prepolymer obtained by reacting polyisocyanate with a polyhydroxy compound in the reaction molar ratio (NCO/OH) of 2.5 to 4.0 so that its NCO content is 7.0 to 14.0%.
4. The lens of claim 1 , wherein the polarizing film is a stretched film of polyvinyl alcohol resin impregnated with iodine or an iodine compound.
5. The lens of claim 2 , wherein the polarizing film is a stretched film of polyvinyl alcohol resin impregnated with iodine or an iodine compound.
6. The lens of claim 3 , wherein the polarizing film is a stretched film of polyvinyl alcohol resin impregnated with iodine or an iodine compound.
7. The lens of claim 1 , wherein the two surfaces of the polarizing film are covered by layers of the polyurethane resin of the same thickness, respectively.
8. The lens of claim 2 , wherein the two surfaces of the polarizing film are covered by layers of the polyurethane resin of the same thickness, respectively.
9. The lens of claim 3 , wherein the two surfaces of the polarizing film are covered by layers of the polyurethane resin of the same thickness, respectively.
10. The lens of claim 4 , wherein the two surfaces of the polarizing film are covered by layers of the polyurethane resin of the same thickness, respectively.
11. The lens of claim 5 , wherein the two surfaces of the polarizing film are covered by layers of the polyurethane resin of the same thickness, respectively.
12. The lens of claim 6 , wherein the two surfaces of the polarizing film are covered by layers of the polyurethane resin of the same thickness, respectively.
13. A method of manufacturing an infrared absorbing polarized eyeglass lens, said method comprising:
forming an eyeglass lens substrate from a polyurethane resin not containing an infrared absorbing pigment, the eyeglass lens substrate being configured to be ground for adjusting lens power;
inserting the thus formed eyeglass lens substrate into a mold assembly for forming eyeglass lenses;
inserting a polarizing film into a cavity defined by a lens surface of the eyeglass lens substrate and an inner surface of the mold assembly with laminar gaps defined on two surfaces of the polarizing film, respectively; and
pouring a polyurethane resin material containing an infrared absorbing pigment into the mold assembly such that the laminar gaps are filled with the polyurethane resin material, thereby casting the polyurethane resin material into a polarizing element, whereby the polarizing element is superposed and integrated with the eyeglass substrate due to polymerization reaction of the polyurethane resin material.
14. A method of manufacturing an infrared absorbing polarized eyeglass lens, said method comprising:
forming a polarizing element comprising a polarizing film and a polyurethane resin material containing an infrared absorbing pigment and covering two surfaces of the polarizing film;
inserting the thus formed polarizing element into a mold assembly for forming lenses; and
pouring a polyurethane resin not containing an infrared absorbing pigment into a gap defined between the polarizing element and the mold assembly, thereby casting the polyurethane resin into an eyeglass lens substrate configured to be ground for adjusting lens power, whereby the polarizing element is superposed and integrated with the eyeglass substrate due to polymerization reaction of the polyurethane resin material.