[Reader-users] polerizers

Fri May 2 13:19:35 CDT 2008

The polarizers are plastic.  I would be concerned about clarity of the image
if any other substance is applied over them.  

Our solution is a silicon skin that fits over the entire device like a very
tight glove.  This is a product made to protect the Nokia phone.  Holes have
been cut through the silicon skin to expose the camera lense and flash
output plus other things like the power connector and usb port.  

Thanks, J. G.
*************
James Gashel
Vice President of Business Development
K-NFB Reading Technology, Inc.
telephone (443) 854-0854
toll free (866) 836-9988
fax (781) 263-9999
jim at knfbreader.com

-----Original Message-----
From: reader-users-bounces+jim=knfbreader.com at nfbnet.org
[mailto:reader-users-bounces+jim=knfbreader.com at nfbnet.org] On Behalf Of
David Evans
Sent: Friday, May 02, 2008 11:34 AM
To: Kurzweil National Federation of the Blind Reader user list
Subject: Re: [Reader-users] polerizers

Dear All,
I would like to ask this question of Jim Gashal to see if there  is a 
solution to this minor problem.
I do not have my KNFB Reader Mobile as yet, but expect that I will face the 
same situation.
I am an engineer and would like to ask if anyone has considered applying a 
thin coating of clear lacquer to the polarizer's to get them to stick to the

lens and flash better.
We use to use clear lacquer over the aluminum alarm tape that was applied to

glass windows, to ensure that if the glass was broken in a robbery, the thin

tape would also break and not just pull away from the glass causing the 
alarm to fail.
I would ask if the lens and the flash cover is made of plastic or glass. 
Some plastics might be harmed and react to the clear lacquer  chemically, 
but glass will not.
Also the plastic used on the camera and phone.
Some testing might be needed to check this out and to see if it will protect

and keep the polarizer's in place and cause no performance effects on the 
unit.
You could still replace polarizer's, if needed, as the clear lacquer could 
still be peeled off or removed using lacquer thinner such as nail polish 
remover on a rag.
This would be good to know as it might help to fix the moving or loss of the

polarizer's.
I think that this should be tested in the lab first, before anyone does it 
to their unit and even then much caution would be needed as the lacquer 
could react with other parts of the unit such as plastics or electronic 
parts.
Please let us know if this method will work or if or if not  recommended.
Temperature can effect to glue that is on the plastic polarizer's, 
especially over time, causing them to slip or slide out of position.
Has any thought been given to placing the polarizer's on the inside of the 
lens to prevent damage or loss?
I know that the reader will still work, even without the polarizer's, but it

works with them even better according to what I have read on this list.

David Evans, NFBF
Nuclear/Aerospace Materials Engineer
Builder of the Lunar Rovers and the F-117-A Stealth Fighter
----- Original Message ----- 
From: "Jim Barbour" <jbar at barcore.com>
To: "Kurzweil National Federation of the Blind Reader user list" 
<reader-users at nfbnet.org>
Sent: Friday, May 02, 2008 11:31 AM
Subject: Re: [Reader-users] polerizers

> Oh, mine have come off twice now.
>
> I've been using a holster for the phone, but have just ordered a case
> which should help mitigate this problem.
>
> Jim
>
> On Fri, May 02, 2008 at 10:22:19AM -0500, Kevin Jones wrote:
>> the polarizers are cheap and a sighted person can apply them, you won't
>> have to send the unit back like you did the classic reader. Also, I
>> haven't heard of any comming off yet, i've had mine for 2+ weeks without
>> a problem even if they last only 6 months it still wouldn't be that much
>> of a problem.
>>
>>
>> will lomas wrote:
>> > hi to all
>> >
>> >
>> > i can express myself better if i start a new thread concerning the
>> > poleizers
>> >
>> >
>> > If they are to become lose when using the phone then why have them?
>> > I know they stop the glare but if we have to keep buying new ones and
>> > putting them back on again, then what is the point in even using the
>> > reader as they could jsut come off and that's that
>> > with the classics i believe that these problems were less likely to
>> > occur though, someone can correct me if i am wrong, of course
>> > how can we please, best use the camera on the phone in order to not
>> > have hte polerizers come loose on us
>> > will
>> >
>> > _______________________________________________
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