Hi to all,
Does any body know about Anti reflection coating by dipping process.
If yes will it be durable on plastic ophthalmic lenses.
Anti reflection coating by dipping process
Hi to all,
Does any body know about Anti reflection coating by dipping process.
If yes will it be durable on plastic ophthalmic lenses.
I have heard that "someone" is working on this. I haven't heard anymore about it, but it sounds very interesting to me.
I remain skeptical.
DragonlensmanWV N.A.O.L.
"There is nothing patriotic about hating your government or pretending you can hate your government but love your country."
Why?? It's coming or something similar. It should be better than Chemlux, but probably not as good as Carat or other premiums. Chris Ryser's company could probably make one if they would think about it.Originally Posted by DragonLensmanWV
It would certainly be a "different" technology. My brain isn't functioning too well today, but I can't imagine how or what this would be like.
It would be a dip and bake process. Probably 5 or 6 stages.
How would you control the thickness of the layers to quarter-wave tolerances?
How would you eliminate runs?
DragonlensmanWV N.A.O.L.
"There is nothing patriotic about hating your government or pretending you can hate your government but love your country."
These questions and many others are the part that they are "working" on.
Interesting article here: http://ieeexplore.ieee.org/Xplore/lo...hDecision=-203
There are rules. Knowing those are easy. There are exceptions to the rules. Knowing those are easy. Knowing when to use them is slightly less easy. There are exceptions to the exceptions. Knowing those is a little more tricky, and know when to use those is even more so. Our industry is FULL of all of the above.
You just spin the lens while applying the coating material...........................
that would be the easiest of all problems to be solved. You just spin the lens while applying the coating material, called spincoating.
There is presently a chemical AR coating marketed.............................
There is presently a chemical AR coating marketed for photovoltaic cells that is applicable on glas only. Will probably not be long until somebody comes up with the hardcoat as intermediary, that is used on optical lenses.
Chemalux sells spin-coating units for applying SR, AR and Mirror to ophthalmic lenses.
http://www.chemat.com/chemalux/
Organic AR Coatings are being produced and companies like Seiko have products aready being marketed.
Seiko released "Orgatech" which is an Nanocomposite organic AR coating and you will start to see more of this new breed of AR coatings coming. The main advantage is the coating is more flexible and thus more durable over the life of the lens. These coatings are more heat resistant and will result in less returns due to crazing and processing issues.
I do spin coating here. This is being referred to as dip coating, entirely different.
DragonlensmanWV N.A.O.L.
"There is nothing patriotic about hating your government or pretending you can hate your government but love your country."
Nidek also makes a beautiful spin coat AR system, but it's not what I was talking about. A dip and bake system was supposed to be on exhibit at Expo Spring 2010. I don't know any more about it, the info is on my old computer and it is DEAD. If I can find more I'll send it along.
At this time I am not aware of a dip AR. If possible it would be very heavy coating vs a AR coating done in a vacuum chamber. Dip coatings today are primarily used as a hard coat with or a primer with a thermal cure cycle. Hard coat on a lenses is a plus as it aids in the adhesion of a AR coating.
Mirror man
Look into Sol-Gel for info about dip coating AR's.
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The lenses aren't "dipped" so much as the liquid is raised to the lens - this is quite an old fashioned technique for applying a finish to a lens, and prone with problems (pitting, peeling, loss of ar properties and more.
May I ask why you want to find this?
Already out there Photo Hard coating!
I've worked on wet applied (spin and dip) AR coatings for ophthalmics though my work in ophthalmics ended about 5 years ago. There have been at least two broadly commercialized wet applied AR processes. One was dip and was, in my opinion, a non-starter due to poor thickness uniformity (which shows up as reflected color variation across the surface of the lens). The other was spin applied and produced a much more attractive final product however durability was questionable. Both companies used a fairly standard metalorganic sol-gel approach; I believe both companies are now defunct.
As was mentioned above the most viable technology candidate right now is the organic-inorganic nano-composite approach. I haveworked on this extensively (and have a couple of patents). It's a great approach for half of the material in a typical AR coating stack (low index SiO2 replacements), it's not a great approach for the high index layers (TiO2/ZrO2/Nb2O5 in vacuum deposited AR coatings) because getting a suitably high refractive index is not possible with currently available materials. The consequence is that the AR optical performance is not as good as a vacuum applied stack. There is a much, much larger market than ophthalmics driving the development of these coatings (flexible displays as well as displays for pocket/portable/tablet devices like the iPad) so R&D is well funded and will probably result in substantial improvements over the coming few years.
You are right. A french company is producing an easy to clean/anti reflect coating by dip. I'm agree that they cannot reach the level of reflectance of process vaccum deposition but they can reach a reflectance of 99% with two layers and 98% with one layer. It's a economic alternative to the PVD process and for PC lenses.
My friend has developed such a system for dip coating AR (more of an LR). He has had pretty good results and has sold several systems already.
What is LR?
Is this available in the USA if so where?
Low Relection. Maybe Reduced Reflection. It would reduce reflections, but not as well as AR does.
I am pretty sure he has not sold to the US market yet.
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