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US 6,604,824 B2Granted
Polarized lens with oxide additive
OwnerCharles P. Larsoninventor
Life of this patent
Estimating the term…
Abstract
A lens for reducing glare and improving color discrimination includes a lens wafer containing a rare earth oxide such as neodymium that provides progressively higher transmittance at 540 nm than at 500 nm and at 450 nm, and average transmittance at 540 and 610 nm that is greater than the transmittance at 580 nm. A ultra-violet absorber, a polarized filter and anti-reflective layer may be included to reduce UV light, glare and improve contrast and vision.
Claims20
A multi-layer lens for eyeglasses comprising:
- a lens wafer system comprising at least a first lens wafer and a second lens wafer;
- a polarizing layer between the first and second lens wafer;
- and
- an ultraviolet light absorbing component present in the lens wafer system;
- wherein said lens wafer system comprises from about 1% to about 1.8% by mole neodymium and being adapted to impart light transmittance characteristics to the lens such that the lens will exhibit a light transmittance at 500 nm that is greater then its transmittance at 450 nm, a light transmittance at 540 nm that is greater than the transmittance at 500 nm, and an average light transmittance at 540 nm and 610 nm that is greater than a light transmittance at 580 nm,
- said lens being farther characterized by having all spectral points having a transmittance of about 20% or more between 500 nm and 650 nm as defined by ANSI Standard Z803-1996 Section 4.6.3.3.
3 more elements
A multi-layer lens for eyeglasses comprising:
- a lens wafer system comprising at least a first lens wafer and a second lens wafer;
- a polarizing layer between the first and second lens wafer;
- an ultraviolet light absorbing component present in the lens wafer system;
- and
- an anti-reflective layer adjacent to an outer surface of at least one of the lens wafers,
- wherein said lens wafer system comprises from about 1% to about 1.8% by mole neodymium and being adapted to impart light transmittance characteristics to the lens such that the lens will exhibit a light transmittance at 500 nm that is greater that its transmittance at 450 nm, a light transmittance at 540 nm that is greater than the transmittance at 500 nm, and an average light transmittance at 540 nm and 610 nm that is greater than a light transmittance at 580 nm,
- said lens being further characterized by having all spectral points having a transmittance of about 20% or more between 500 nm and 650 nm as defined by ANSI Standard Z803-1996 Section 4.6.3.3.
4 more elements
Dependencies are inferred from the claim text.