Method of manufacturing polarized spectacle lens
AssigneesHiroshi Kawahara, Yoshinori Inui
InventorYasunobu Nakagoshi
Life of this patent
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Abstract
A film of a plastic material fusible with a lens-forming material and having a high light transmissivity is bonded and laminated, with an adhesive, to a polarizing sheet having a polarization coefficient of 99.0% or higher and a light transmissivity of 40% or higher. The resultant laminate is hot-pressed into a shape similar to an aimed lens. The hot-pressed laminate is placed in a lens forming mold cavity, and a lens-forming resin which has been colored or of which light transmissivity has been adjusted to a desired transmissivity is injected into the cavity to thereby form a polarized lens.
Claims11
A method of manufacturing a polarized spectacle lens, comprising:
- bonding, with an adhesive, a plastic film having a thickness in a range of from 0.1 mm to 0.5 mm to one of opposing surfaces of a polarizing sheet to thereby form a laminate, said polarizing sheet comprising a polarizing film with a cellulose triacetate film bonded to each of the opposing surfaces of said polarizing film, and having a thickness of not greater than 0.2 mm, a light transmissivity of 40% or higher and a polarization coefficient of 99.0% or higher;
- hot-pressing said laminate into a shape of which surface contours are similar to those of a spectacle lens;
- placing the hot-pressed laminate in a lens forming mold cavity with said plastic film facing inward of said cavity;
- and injecting a lens-forming resin fusible with said plastic film into said cavity.
A polarized spectacle lens, comprising:
- a plastic film having a thickness in a range of from 0.1 mm to 0.5 mm bonded to one of opposing surfaces of a polarizing sheet with an adhesive to thereby form a laminate, said polarizing sheet comprising a polarizing film with a cellulose triacetate film bonded to each of the opposing surfaces of said polarizing film, and having a thickness of not greater than 0.2 mm, a light transmissivity of 40% or higher and a polarization coefficient of 99.0% or higher;
- and
- a layer of a lens-forming resin fused with said plastic film.
Dependencies are inferred from the claim text.