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Ophthalmic lens which is coated with an electrostatic film and method of edging one such lens

A lens and film technology, applied in the field of ophthalmic lenses, can solve the problems of lens waste, difficult to obtain trimming operation, changing the adhesion of liner and convex contact surface, etc.

Active Publication Date: 2006-11-29
ESSILOR INT CIE GEN DOPTIQUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The consequence of this type of surface coating is that the adhesion of the liner to the convex contact surface may thereby be changed, making it difficult to obtain a satisfactory trimming operation, especially for polycarbonate lenses, which are not compatible with other materials (made of Trimming polycarbonate lenses produces greater forces than
[0016] The consequence of a poorly performed trimming operation is total waste of the lens

Method used

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  • Ophthalmic lens which is coated with an electrostatic film and method of edging one such lens

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0102] Process such a substrate, that is, the substrate is based on CR39  ORMA  15 Supra ophthalmic lens, with a diopter of -2.00, a diameter of 65mm, and includes a polysiloxane type anti-wear coating on both sides.

[0103] 1-1 Description of substrate processing

[0104]The vacuum processor used is a Balzers BAK760 machine equipped with an electron gun, an "End-Hall" Mark 2Commonwealth ion gun, and a Joule effect evaporation source.

[0105] The lens is arranged on the carousel, and the concave side faces the evaporation source and the ion gun.

[0106] The pumping operation is performed before reaching the secondary vacuum.

[0107] The Mark 2 ion gun uses an argon ion beam to irradiate the substrate surface to activate the substrate surface.

[0108] Then, after the ion radiation has been interrupted, the electron gun is used to continuously evaporate 4 anti-reflection optical layers, namely high refractive index (HI), low refractive index (BI), high refractive index (HI), ...

example 2

[0128] 30 polycarbonate lenses with a diopter of -2.00 were processed as described in paragraph 1-1 of Example 1.

[0129] 1-1 Apply electrostatic film and put the lens in the bag

[0130] Reference lens

Polycarbonate, -2.00 diopter, 70mm diameter

Quantity

15 lenses

Bag provider

Schock / Papier Fabrik Lahnstein Schock

[0131] An electrostatic film with a protrusion and a diameter of 38 mm was manually applied to the middle of the convex side of the remaining 15 lenses.

[0132] Reference lens

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Abstract

The invention relates to an optical lens having a temporary protective coating comprising at least one outer layer which can be degraded mechanically by means of friction or contact and which is covered with a strippable film that binds electrostatically to the outer layer. The invention is suitable for ophthalmic lenses.

Description

Technical field [0001] The present invention generally relates to an optical lens, and more particularly to an ophthalmic lens, the lens having a main surface including a temporary protective coating and covering the coating with a peelable electrostatic film. Background technique [0002] Optical lenses-more specifically ophthalmic lenses-are made from a series of molding and / or surface finishing / smoothing steps that determine the geometry of the convex and concave optical surfaces of the lens, followed by appropriate surface treatments. [0003] The final finishing step of the ophthalmic lens is a trimming operation, which includes processing the edge or periphery of the lens to determine the shape of the lens according to the required size, so that the lens fits the frame to be installed in it. [0004] Generally, trimming is performed on a grinding machine including a diamond grinding wheel that performs the above-mentioned processing steps. [0005] In this operation, the le...

Claims

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Application Information

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IPC IPC(8): G02C7/00G02B1/10B24B1/00B24B9/14
CPCB24B1/00G02B1/105B24B9/14G02B1/14
Inventor P·拉康D·孔特
Owner ESSILOR INT CIE GEN DOPTIQUE
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