Optical lens with antistatic coating

Abstract

The optical lens (10) has a lens element (12) on which several layers (16) with an anti-static coating (14) are formed for generating an anti-static effect. Two adjacent layers (18, 20) are formed with respect to the lowermost layer (22) and an upper layer (30). The stoichiometrically formed layer (18) is made of titanium oxide with specific amount of oxygen, and an aluminum oxide layer (20) is formed over the titanium oxide layer (18). An independent claim is included for method for formation of several layers of lens element.

Description

technical field [0001] The invention relates to an optical lens, in particular for use as an eyeglass lens, having a lens element and a coating which produces an antistatic effect, said coating being applied to said lens element and comprising a plurality of layers. [0002] Furthermore, the invention relates to a method for producing an antistatic coating for lens elements having a plurality of layers. Background technique [0003] Antistatic spectacle lenses are known in the art. It offers the advantage that a lower degree of dust particles adheres to the spectacle lens due to the absence of electrostatic attraction. Without an antistatic coating, eyeglass lenses become soiled more quickly and need to be cleaned more often. Furthermore, dust is often difficult to remove. For coatings of spectacle lenses, therefore, electrically conductive and thus antistatic layers are usually inserted within the coating. For this purpose, until now, a separate layer has been inserted ...

AI Technical Summary

Problems solved by technology

However, inserting such an ITO layer into an anti-reflective coating has certain disadvantages, such as higher cost of coating, and damage to the mechanical as well as optical properties of the anti-reflective coating.

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