Polarizing lens made of aromatic polycarbonate

Abstract

The present invention relates to a polarizing lens molded by inserting a polarizing sheet bent into a sphere or an asphere after having an aromatic polycarbonate sheet bonded via an adhesive layer to both surfaces of a film with polarized nature into a mold, and injecting aromatic polycarbonate, wherein heat treatment at a temperature not less than a temperature of 50° C. lower than the glass transition point and less than the glass transition point for an appropriate time has been performed after injecting aromatic polycarbonate to approximate a designed value of the lens curvature.

1 . A polarizing lens formed by bending a polarizing sheet having an aromatic polycarbonate sheet bonded via an adhesive layer to both surfaces of a film with polarized nature into a sphere or an asphere, and injecting aromatic polycarbonate into one surface of the polarizing sheet, wherein the retardation value of the aromatic polycarbonate sheet at least arranged on the opposite surface to the surface where aromatic polycarbonate is injected of the polarizing sheet is not less than 2000 nm and less than 20000 nm, the polarizing lens has been subjected to heat treatment at a temperature not less than a temperature of 50° C. lower than the glass transition point and less than the glass transition point after injecting aromatic polycarbonate, and the base curves in the horizontal direction and the base curve in the vertical direction of the polarizing lens after performing the heat treatment have each approximated a designed value as compared to before performing the heat treatment. 
     
     
         2 . A polarizing lens according to  claim 1 , wherein when the heat treatment temperature is X and the heat treatment time is Y, X ranges from 115 to 135° C., the relationship between the heat treatment temperature and time meets Formula 1, and the anisotropy of the base curves in the horizontal direction and in the vertical direction of the polarizing lens after performing the heat treatment is not more than 0.25.
   15.6≦Log( Y )+0.122     X ≦ 16.9  (1)
 
 
     
     
         3 . A polarizing lens according to  claim 1 , wherein when the heat treatment temperature is X and the heat treatment time is Y, X ranges from 115 to 135° C., the relationship between the heat treatment temperature and time meets Formula 2, and the anisotropy of the base curves in the horizontal direction and in the vertical direction of the polarizing lens after performing the heat treatment is not more than 0.1.
   16.1≦Log( Y )+0.122     X   16.8  (2)