Abstract:
The present invention is drawn to a process of drilling organic glasses, comprising the following steps: (a) providing an organic glass substrate; (b) providing onto at least one surface of said organic glass substrate optionally via an adhesive layer selected from the group consisting of pressure sensitive adhesives and hot melt adhesives, a polymer film having an elastic modulus of equal to or less than 3 GPa in at least one direction and a E*h2 is equal to or more than 3.5 N in at least one direction, E and h being respectively the elastic modulus and the thickness of the thermoplastic polymer film; and (c) drilling a hole through the substrate and polymer film by means of a drill.
Abstract:
The present invention is drawn to a process of drilling organic glasses, comprising the steps of: (a) providing a substrate of organic glass, preferably of optical grade, (b) laminating onto at least one surface of said organic glass substrate via an adhesive layer selected from the group consisting of pressure sensitive adhesives and hot melt adhesives, a thermoplastic polymer film having a thickness of at least 40 μm and an elastic modulus of at least 3 GPa, the peel strength of the thermoplastic polymer on the organic glass substrate being higher than 1.3 N/25 mm, preferably of at least 1.5 N/25 mm, (c) drilling a hole through the substrate and polymer film by means of a drill, and (d) optionally removing the thermoplastic polymer film and adhesive.
Abstract:
A light filtering element, includes: at least one layer, a first layer of the at least one layer being stretched along a strain direction and including a first narrowband dye, the first narrowband dye including a first narrowband dye peak absorbance wavelength with a first narrowband dye bandwidth; and a first dichroic dye configured to absorb polarized light, the first dichroic dye including a first dichroic dye peak absorbance wavelength with a first dichroic dye bandwidth, molecules of the first dichroic dye being at least partially oriented along the strain direction.
Abstract:
A method of manufacturing an optical lens (417, 901), comprising: obtaining (S301) a transparent thermoplastic (TP) carrier (410, 1210) with at least one smooth surface; printing (S305), via a 3-D printer on the side opposite to the at least one smooth surface of the transparent TP carrier (410, 1210), at least one transparent layer (420, 1220) using a thermoplastic filament (403), each transparent layer (420, 1220) having a predetermined light filtering property, thereby forming a functional layer (420, 1220); and performing (S307) an injection over-molding process (415) to fuse bond the functional layer (420, 1220) to a thermoplastic substrate thereby forming the optical lens, wherein the at least one smooth surface of the transparent TP carrier (410, 1210) forms a smooth surface of the manufactured optical lens (417, 901).
Abstract:
The disclosure includes core-shell filament composition for additive manufacturing of ophthalmic lenses and ophthalmic lens components. The disclosure also includes a set of criteria for selecting core and shell thermoplastic combinations that exhibit high optical clarity, improved filament inter-strand diffusion, high inter-strand adhesion, and improved manufactured part strength when used in an additive manufacturing method like fused deposition modelling.
Abstract:
Embodiments of the disclosure relate to a series of PC resin additives for maintaining the color stability and blue-cut performance during injection molding. The additives may be used to adapt a PC resin customarily used for sun protection lenses for clear lens applications.
Abstract:
The combination of selective and high pass filters to cut harmful blue light allowed to achieve the best compromise between high blue cut performance, high UV cut and low yellow index, not achievable when using the filters alone.
Abstract:
The present invention relates to a transparent optical article (e.g. an ophthalmic lens) comprising a thermoplastic substrate and a dye at least partially inhibiting light having a wavelength ranging from 400 to 460 nm and an optical brightener for at least partially balancing the color imparted to the transparent optical article by the dye, wherein said optical brightener emits light by fluorescence at a wavelength ranging from 400 to 460 nm and is incorporated into a layer fused or bonded to the thermoplastic substrate. Said optical brightener allows for perception of said optical article as less yellow, and even colorless, to a user or to an observer. In addition, the UV-absorbers that may be present in the thermoplastic substrate do not negatively interact with the optical brightener.
Abstract:
The present invention is drawn to a process of drilling organic glasses. The process comprises (a) providing an organic glass substrate; (b) providing onto at least one surface of said organic glass substrate optionally via an adhesive layer selected from the group consisting of pressure sensitive adhesives and hot melt adhesives, a polymer film having an elastic modulus of equal to or less than 3 GPa in at least one direction and a E*h2 equal to or more than 3.5 N in at least one direction, E and h being respectively the elastic modulus and the thickness of the thermoplastic polymer film; and (c) drilling a hole through the organic glass substrate and polymer film by means of a drill.