Retainer for the Processing of Optical Workpieces, Particularly Spectacle Lenses
US-2024351157-A1 · Oct 24, 2024 · US
Colloidal silica finishing of metal fluoride optical components
US9254544B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9254544-B2 |
| Application number | US-20021408-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 28, 2008 |
| Priority date | Aug 28, 2008 |
| Publication date | Feb 9, 2016 |
| Grant date | Feb 9, 2016 |
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Abstract
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The invention is directed to a method for finishing alkaline earth metal fluoride optical components and to the alkaline earth optical elements produced using the method. In particular, in the last polishing step, the method of the invention uses a colloidal silica polishing slurry having containing silica particles having a particle size of <500 nm. Additionally, after colloidal silica polishing, the method using a megasonic cleaning step with a high pH detergent cleaning solution to remove any silica residue on the polished optical component. The optic resulting from use of the method has a polished and unetched surface roughness of less than 0.5 nm; a surface roughness of less then 0.6 nm after polishing and etching; and a step height of less than 6 nm.
First claim
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We claim: 1. An alkaline earth metal fluoride single crystal optic, the optic comprising a single crystal optic made of an alkaline earth metal fluoride selected from the group consisting of MgF 2 , CaF 2 , BaF 2 and SrF 2 , and mixtures thereof, wherein the optic in an uncoated state comprises a surface roughness of less than 0.6 nm rms, measured using optical interferometry, and is substantially free of a precipitated redeposition layer. 2. The optic accordi…
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Cross-Sectional Technologies · mapped topic
- B24B13/00Primary
Operations & Transport · mapped topic
Physics · mapped topic
Physics · mapped topic
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Frequently asked questions
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- What does patent US9254544B2 cover?
- The invention is directed to a method for finishing alkaline earth metal fluoride optical components and to the alkaline earth optical elements produced using the method. In particular, in the last polishing step, the method of the invention uses a colloidal silica polishing slurry having containing silica particles having a particle size of <500 nm. Additionally, after colloidal silica polishi…
- Who is the assignee on this patent?
- Feng Jiangwei, Phung Mai, Sabia Robert, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification B24B13/00. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Feb 09 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).