Film laminated ophthalmic lenses with improved wheel edging performance

A lens and edging technology, applied in glasses/safety glasses, glasses/goggles, instruments, etc., can solve the problems of film separation and deformation, avoid film deformation and/or avoid film separation, and overcome standard grinding wheels The effect of edge defects

Inactive Publication Date: 2015-10-28
ESSILOR INT CIE GEN DOPTIQUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Two types of defects can occur during wheel edging of fragile components: membrane separation and / or membrane deformation
As shown in Figure 2B, the first type of defect 20x is within the film layered structure 20w
As shown in Figure 2C, a second type of defect 20y occurs between the lens 20s and the film layered structure 20w

Method used

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  • Film laminated ophthalmic lenses with improved wheel edging performance
  • Film laminated ophthalmic lenses with improved wheel edging performance
  • Film laminated ophthalmic lenses with improved wheel edging performance

Examples

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Embodiment Construction

[0043] Simple monofilm laminate with improved edging properties

[0044] Figure 1A and image 3 is a comparative example of simple film lamination. In FIG. 1A a simple thin TAC film 10a is laminated to a lens 10s by a thin layer of PSA adhesive 10g. The thickness of the film 10a is approximately 40 microns, and the thickness of the adhesive layer 10g is 25 microns. Laminated lenses 10m with these thin layers produced poor edging results. In other words, as shown in Figure IB, the laminated lens 10m will have an unacceptably high percentage of defects.

[0045] exist image 3 In this case, a simple thick TAC film 34a is laminated to a lens 34s by a thick layer of PSA adhesive 34g. The thickness of the film 34a is approximately 190 microns, and the thickness of the adhesive layer 34g is 25 microns. Laminated lenses 34m with these thick layers produced good edging results. In other words, the laminated lens 34m will have a low or no defect percentage.

[0046] We have gone ...

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Abstract

A laminated optical lens having an edging-optimized laminar configuration and method for manufacturing same. The laminated optical lens includes an optical base lens and a film layered structure including an external film furthest from said lens. An adhesive layered structure is placed between the film layered structure and the optical base lens so as to permanently retain the film layered structure on the surface of the optical base lens. The laminated lens is manufactured by laminating a film layered structure having an external film to an optical base element with an adhesive layered structure. The external film has a thickness of at least 100 μιπ, and preferably a thickness in the range of 150 microns to 300 microns inclusive. The adhesive layered structure has a thickness in the range of 5 microns to 100 microns inclusive, and preferably of 25 microns to 50 microns inclusive

Description

technical field [0001] This invention relates to film laminated ophthalmic lenses with improved grinding wheel edging properties. Background technique [0002] Spectacle lenses are manufactured as discs. The outer peripheral edge of the disc is then removed by grinding with a grinding wheel to provide a trimmed lens to be mounted in a spectacle frame or used as rimless spectacles. To provide the optical properties of the lens, films or film layers may be laminated to the disc. For example, a single film or a layered structure of films including at least one functional film can be laminated to the lens. However, films and layered structure laminated lenses are delicate parts that can easily become delaminated during the grinding wheel edging process. [0003] More precisely, as can be seen in Figure 1A, a single layer film 10a or simple film is laminated to a lens 10s with an adhesive layer 10g. In other cases, layered structures are provided comprising two or more separa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D11/00G02C7/02
CPCB29D11/0073G02C7/02G02C2202/16B29D11/00009Y10T156/10G02C7/12
Inventor 蒋培奇S·韦伯M·庞德斯J·马查M·伯根斯
Owner ESSILOR INT CIE GEN DOPTIQUE
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