Translucent eyewear lenses and method of manufacture therefor

Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Composite or multiple layer

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264 26, 351 44, 427162, B29D 1100

Patent

active

061593974

ABSTRACT:
The present invention is addressed to a method for fabricating lenses having at least one or more translucent regions used to reduce glare and/or increase visual acuity. To overcome the limitations of the prior art, an injection mold die having a selective portion thereof textured with a pattern or so-called "texture," which is replicated on the lens during injection molding, is employed to form a region of desired translucency on the finished lens. Various methods may be employed to fabricate the texture or pattern on the desired surface portion of the mold die, including mechanical engraving, chemical etching, and electrical-erosion machining (EDM and ECM). Typically, the texture or pattern includes multiple grained features of a quasi-repeating geometrical pattern distributed on the selected portion of the mold die. In general, the feature size of the texture or pattern is chosen such that the resulting replicated texture or pattern on the lens forms a region of desired translucency or a translucent region that normalizes glare to a level of diffuse illumination. That is, the translucent region is formed as having light diffusing characteristics, but allowing for the transmission of diffuse luminance.

REFERENCES:
patent: 4364878 (1982-12-01), Laliberte et al.
patent: 4542964 (1985-09-01), Gilson et al.
patent: 4836960 (1989-06-01), Spector et al.
patent: 5096626 (1992-03-01), Takamizawa et al.
patent: 5523030 (1996-06-01), Kingsbury
patent: 5710613 (1998-01-01), Hughes

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