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Method for molding ophthalmic lenses and apparatus for applying coatings to ophthalmic lens mold surfaces

A lens mold and lens technology, applied in the field of devices on the surface, can solve problems such as damage to ophthalmic lenses, and achieve the effect of reducing the number of

Active Publication Date: 2017-06-30
ALCON INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the application of the large forces required can cause damage to the ophthalmic lens, and it is therefore an object of the present invention to overcome these problems and provide a method that reduces the considerable force required to open the mold and facilitates the use of ophthalmic lenses, Method and apparatus for disengagement and removal of e.g. contact lenses from the male and female mold halves of an open lens mold

Method used

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  • Method for molding ophthalmic lenses and apparatus for applying coatings to ophthalmic lens mold surfaces

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Embodiment Construction

[0038] In FIG. 1 , the means for applying a temporary coating onto the lens-forming surface of a mold half is indicated generally by reference numeral 1 . More specifically, the apparatus shown in FIG. 1 comprises a coating head 2 which is in contact with a lens forming surface 21 of a female mold half 20 of a contact lens mold. The lens forming surface 21 of the female mold half 20 has a generally concave shape and is embodied as an insert 23, which may be made of glass, for example BK7 or quartz glass, and which is arranged in a carrier 24, which The frame 24 can be made of metal, for example. The support 25 houses the bracket 24 in which the insert 23 is arranged. The lens forming surface 21 of the female mold half 20 is surrounded by an annular flange region 22 .

[0039] The applicator head 2 comprises a housing 3 provided with a supply port 4 and a discharge port 5 suitable for connection with a tubular line. The applicator head 2 may be attached to a mechanism (not s...

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Abstract

The present invention relates to a method for applying a coating to the surface of an ophthalmic lens mold. The mold comprises male and female mold halves (20), each of which is provided with a lens forming surface (21). The method comprises: - applying a temporary coating to at least a portion of at least one of the male and female mold halves (20), the temporary coating being capable of reducing contact between the lens forming material and the lens forming surface (21) Adhesion; and - drying the temporary coating applied to said portion of the lens forming surface (21). The invention also relates to a device (1) for applying such a temporary coating onto said portion of the lens forming surface (21) of an ophthalmic lens mold.

Description

technical field [0001] The present invention relates to methods for molding ophthalmic lenses, especially hard or soft contact lenses / contact lenses, and to methods for applying coatings to ophthalmic lens molds, especially for molding hard or soft The device of the contact lens on the surface of the lens mold. Background technique [0002] The mass production of ophthalmic lenses, especially hard or soft contact lenses, usually takes place in fully automated processes. An example for such a process is described in WO98 / 42497. In this preferred method of fully automated mass production, contact lenses are manufactured using reusable molds comprising male and female mold halves. In a processing station, the starting material, for example a prepolymer solution, is dispensed into the female mold half and the injection mold is then closed with the corresponding male mold half. Suitable polymers formed by actinic polymerization and / or crosslinking include polyvinyl alcohol (PV...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D11/00B29C33/58
CPCB29D11/00192B29C33/58B29D11/00125B29L2011/0041
Inventor H·海德里希A·海因里希K·斯特劳比
Owner ALCON INC