Apparatuses and methods for blue-cut lenses

Patent metadata

Field	Value
Publication number	US-10768448-B2
Application number	US-201716335206-A
Country	US
Kind code	B2
Filing date	Sep 20, 2017
Priority date	Sep 20, 2016
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

A blue-cut wafer can be coupled to a lens, such that the blue-cut wafer can be configured to reduce by absorption at least a portion of light having a first wavelength range from 400 nanometers to 500 nanometers, preferably from 400 nanometers to 460 nanometers. The blue-cut wafer can permit light having a second wavelength range, the second wavelength range being greater than the first wavelength range, and homogenize a color appearance and a blue-cut performance level of the blue-cut wafer based on the blue-cut wafer having a maximum thickness and a minimum thickness within twenty percent of a nominal thickness of the blue-cut wafer.

First claim

The invention claimed is:

1. A blue-cut wafer, comprising:
one or more of blue blocking dyes blended with a thermoplastic resin injection molded into the blue-cut wafer; or
a thermoplastic blue-cut film thermoformed into the blue-cut wafer;

wherein:
the blue-cut wafer is configured to reduce by absorption at least a portion of light having a first wavelength range from 400 nanometers to 500 nanometers;
the blue-cut wafer has a maximum thickness and a minimum thickness within twenty percent of a nominal thickness of the blue-cut wafer; and
a color appearance and a blue-cut performance level of the blue-cut wafer are homogenized in such a manner as ΔE≤1, where ΔE is a color difference between a wafer center and a wafer edge calculated using color-difference formula CIE76.

2. The blue-cut wafer of claim 1 , wherein the blue-cut wafer includes a selection of a difference between an edge thickness and a center thickness of the blue-cut wafer based on a selected range of thickness of the blue-cut wafer.

3. The blue-cut wafer of claim 2 , wherein the blue-cut wafer is configured to permit light having a second wavelength range, the second wavelength range including wavelengths outside the first wavelength range.

4. The blue-cut wafer of claim 1 , wherein the blue-cut wafer includes one or more additional layers providing one or more of polarization, near-infrared cut, additional light filters, and color balancing.

5. A method of manufacturing a transparent optical article comprising the blue-cut wafer of claim 1 , comprising:
blending blue blocking dyes with a thermoplastic resin injection molded into a blue-cut wafer or thermoforming a blue-cut film into the blue-cut wafer,
calculating a thickness variation range of the blue-cut wafer;
calculating a maximum edge thickness and minimum edge thickness of the blue-cut wafer; and
integrating the blue-cut wafer onto a lens via one or more of front-side lamination, direct injection, in-molding lamination, or bi-injection.

6. The method of claim 5 , further comprising:
selecting a difference between an edge thickness and a center thickness of the blue-cut wafer based on the thickness variation range of the blue-cut wafer.

7. The method of claim 6 , further comprising:
selecting a blue-cut wafer thickness less than 1.5 millimeters.

8. The method of claim 6 , further comprising:
selecting a blue-cut wafer thickness less than 1.3 millimeters.

9. The method of claim 6 , further comprising:
selecting a blue-cut wafer thickness less than 1.1 millimeters.

10. The method of claim 5 , wherein the homogenized color appearance and blue-cut performance level of the blue-cut wafer is based on the blue-cut wafer having a maximum thickness and a minimum thickness within twenty percent of a nominal thickness of the blue-cut wafer.

11. The method of claim 5 , further comprising:
permitting, via the blue-cut wafer, light having a second wavelength range outside the first wavelength range.

Assignees

• Essilor Int

Inventors

• Shan Haifeng
• Chiu Hao Wen
• Jallouli Aref

Classifications

• C08K5/0041

  Optical brightening agents, organic pigments · CPC title

• B29D11/00634

  Production of filters · CPC title

• G02C7/104 Primary

  having spectral characteristics for purposes other than sun-protection · CPC title

• G02B5/223 Primary

  containing organic substances, e.g. dyes, inks or pigments · CPC title

• G02C2202/10

  Optical elements and systems for visual disorders other than refractive errors, low vision · CPC title