Process for the manufacture of an ophthalmic lens

A technology of ophthalmic lenses and raw materials, applied in applications, household appliances, and other household appliances, can solve problems such as complex systems, and achieve the effect of improving uniformity

Inactive Publication Date: 2010-03-10
NOVARTIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the help of multiple light guides, a single mercury lamp can be used to supply light to multiple molds, however, complex systems are required to ensure a uniform light intensity distribution within the mold cavity containing the raw material used to form the lens

Method used

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  • Process for the manufacture of an ophthalmic lens
  • Process for the manufacture of an ophthalmic lens
  • Process for the manufacture of an ophthalmic lens

Examples

Experimental program
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Embodiment Construction

[0025] A first variant of the method according to the invention consists in figure 1 shown in . A plurality of UV-LEDs 1 are arranged on a conveyor belt 3 on which a plurality of molds 2 are arranged. Each mold 2 comprises a male mold half 20 and a female mold half 21 forming a mold cavity between their respective lens forming surfaces. Typically, by assembling the male mold half 20 and the female mold half 21 , the raw material comprising a photoinitiator can be filled into the female mold half 21 before closing the mold 2 . The mold 2 is made of a translucent light scattering material, such as polypropylene.

[0026] figure 1 The embodiment shown in is a so-called double-sided molding (DSM) process. The raw materials used have a relatively low polymerization and / or crosslinking rate, that is to say the polymerization and / or crosslinking process lasts for a longer period of time, for example in the range of one to several minutes. The moving mold 2 passes through the ind...

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PUM

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Abstract

A process for the manufacture of an ophthalmic lens, e.g. a contact lens, comprises the steps of: dispensing a polymerizable and / or cross-linkable starting material comprising a photoinitiator into amold (2, 20,21) and exposing the starting material in the mold (2,20,21) to UV-light in order to cause polymerization and / or cross-linking of the starting material in the mold so as to form the ophthalmic lens. Exposing the starting material to UV-light is performed by using at least one solid-state UV-light emitting die (80) or UV-LED (1) to the emitted light of which the starting material contained in the mold (2,20,21) is exposed.

Description

technical field [0001] The invention relates to a method of manufacturing an ophthalmic lens according to the preambles of the independent claims. Background technique [0002] Many technical processes for the manufacture of contact lenses are based on photochemically induced polymerization of monomer mixtures and / or crosslinking of functional polymers, said polymers being placed inside a mold cavity, which usually consists of a male and a female mold half, so A cavity is formed between the forming surfaces of the two mold halves. Typically, the light source used to decompose the photoinitiator contained in the raw material is a fluorescent light tube or a mercury lamp (medium or high pressure mercury lamp). In particular, mercury lamps have a high energy output, making them particularly suitable for high-volume manufacturing, such as is required in the manufacture of single-use lenses that are discarded after wear. [0003] However, mercury lamps have the disadvantage of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D11/00B29C35/00
CPCB29D11/00134
Inventor A·海因里希B·赛费尔林
Owner NOVARTIS AG
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