摘要:
The present invention provides a method of spin casting an opthalmic device the method comprising: i) polymerising one or more monomers in a spin casting mould to form the opthalmic device; and ii) sealing the opthalmic device in the spin casting mould to provide a package.
摘要:
A method for coating hydrogel and silicone hydrogel articles, and articles made by the method, are provided in which the coating is first applied to the molding surface in which an article-forming material will be cured to form the article. The method permits the thickness and uniformity of the coating to be more easily controlled than in known coating methods.
摘要:
Diffractive lenses having gradial zones (62, 70, 78, 90, 98, 106, 114) are formed by separately, sequentially spin casting and polymerizing successive radial zones of the lens to produce optical phase differences of 2π between adjacent gradial zones. Diffractive lenses may be molded in plano-plano( 60), plano-concave (68) and plano-convex (76) geometries and also may be combined with conventional plano-plano (84), convex-convex (92), plano-concave (100) and plano-convex (108) refractive lenses.
摘要:
A method and apparatus for producing a plastic lens element having a gradient index of refraction is disclosed in which first and second monomer-containing compositions, each having a different index of refraction, are injected into a centrifugal mold. Precise control of the gradient index is achieved by varying the ratio of the two monomers over a predetermined number of steps during the filling process.
摘要:
An apparatus for spin casting lenses includes a rotatable tube, the rotatable tube defining a longitudinal cavity, wherein the longitudinal cavity is configured to receive molds. According to one exemplary embodiment, the rotatable tube is made of metal and includes a plurality of apertures configured to permit the transmission of actinic radiation.
摘要:
A method for coating hydrogel and silicone hydrogel articles, and articles made by the method, are provided in which the coating is first applied to the molding surface in which an article-forming material will be cured to form the article. The method permits the thickness and uniformity of the coating to be more easily controlled than in known coating methods.
摘要:
L'invention décrit un procédé et un dispositif de fabrication d'une lentille plastique possédant un indice de réfraction à gradient. Selon ledit procédé, on injecte dans un moule centrifuge une première et une deuxième composition contenant des monomères, chacun de ces monomères possédant un indice de réfraction différent. On effectue un contrôle précis de l'indice à gradient en modifiant la proportion des deux monomères pendant un nombre d'étapes prédéterminé au cours du processus de remplissage.