Polarizing lens and method of its manufacture

Details Polarizing lens and method of its manufacture Polarizing lens and method of its manufacture

2009-08-04

2011-11-29

Greece, James (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S163000, C264S001320

Reexamination Certificate

active

08066371

ABSTRACT:
High productivity polarizing lens that is impact-resistant, and is not prone to warping or iridescent patterning and other color irregularities. Polarizing lens (1) includes a polarizing sheet (2) in which a pair of protective films (11) and (12) is laminated on both sides of a polarizing film (10), and a lens base material layer (3) integrally bonded on a rear side of the polarizing sheet (2), the lens base material layer (3) being composed of polyurethane. Manufacturable by: bending the polarizing sheet (2) at a predetermined curvature; fitting the polarizing sheet (2) in a mold recessed with a cavity contoured to correspond to the bent polarizing sheet so that its front side runs along the cavity; and filling and injection-molding thermoplastic polyurethane into the mold in which the polarizing sheet (2) has been fit, to form the lens base material layer (3) on the polarizing sheet (2) rear side.

REFERENCES:
patent: 5042935 (1991-08-01), Logan et al.
patent: 5047272 (1991-09-01), Hassel et al.
patent: 6177032 (2001-01-01), Smith et al.
patent: 2004/0096666 (2004-05-01), Knox et al.

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