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'[EE]: Shining light in plexiglass'
2007\09\03@122134 by Gaston Gagnon

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IIRC some time ago (years?) someone (Jinx?) was experimenting with
shining  light in Plexiglas by attaching a led on the edge of the sheet.
I have been looking for this thread with no avail. I would greatly
appreciate if anyone that remember that discussion could give me a
pointer to it.
Gaston Gagnon

2007\09\03@183337 by Tony Smith

picon face
> IIRC some time ago (years?) someone (Jinx?) was experimenting
> with shining  light in Plexiglas by attaching a led on the
> edge of the sheet.
> I have been looking for this thread with no avail. I would
> greatly appreciate if anyone that remember that discussion
> could give me a pointer to it.
> Gaston Gagnon


Agilent have a good PDF on that sort of thing, Google 'Agilent LED light
pipe' or similar.

Quite a few good tips.  Like embed the LED (drill a hole) in the plastic, or
epoxy it to reduce losses caused light bouncing off the edge of the plastic.
It also talks about drilling holes in the LED so you can put a fibre optic
cable right over the die, but that's probably a bit excessive.

Tony

2007\09\03@192905 by Zik Saleeba

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I've actually experimented with drilling holes in Luxeons to do this.
It works but you have to be very careful not to tear the plastic bezel
right off the die.

Cheers,
Zik

On 9/4/07, Tony Smith <spam_OUTajsmithTakeThisOuTspamrivernet.com.au> wrote:
{Quote hidden}

> -

2007\09\03@215758 by Cedric Chang

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Zik

Would you expand on what you were doing with the Luxeons ?

Best
Cedric



On Sep 3, 2007, at 5:29 PM, Zik Saleeba wrote:

I've actually experimented with drilling holes in Luxeons to do this.
It works but you have to be very careful not to tear the plastic bezel
right off the die.

Cheers,
Zik

On 9/4/07, Tony Smith <.....ajsmithKILLspamspam@spam@rivernet.com.au> wrote:
{Quote hidden}

> -

2007\09\03@230331 by Zik Saleeba

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I was trying to get as intense a point light source as possible. One
method I tried was to drill a small hole directly into the front of a
luxeon and insert an optic fiber through the hole until it was almost
touching the die. It worked ok but there was an awful lot of lost
light so I gave up on that approach.

Cheers,
Zik

On 9/4/07, Cedric Chang <ccspamKILLspamnope9.com> wrote:
{Quote hidden}

2007\09\03@234731 by Charles Craft

picon face
There was an article in Popular Electronics (I think) where they
melted the LED bezel with a soldering iron and inserted the
FO cable into the molten plastic. Couldn't find anything like that
in a google search.  :-|

{Original Message removed}

2007\09\04@090242 by Mike Hord

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I've had ridiculously good luck using cheapo CCFLs taped along the
edge, or if they're enclosed in a plastic tube, cemented on.

This is for VERY imprecise functions- usually for doing fun things
like illuminated signs or accent lighting.  For anything scientific
I have no input.

What are you after?

Mike H.

On 9/3/07, Gaston Gagnon <EraseMEgaston.gagnonspam_OUTspamTakeThisOuTvideotron.ca> wrote:
> IIRC some time ago (years?) someone (Jinx?) was experimenting with
> shining  light in Plexiglas by attaching a led on the edge of the sheet.
> I have been looking for this thread with no avail. I would greatly
> appreciate if anyone that remember that discussion could give me a
> pointer to it.
> Gaston Gagnon
>
> -

2007\09\04@090305 by Mike Hord

picon face
I've had ridiculously good luck using cheapo CCFLs taped along the
edge, or if they're enclosed in a plastic tube, cemented on.

This is for VERY imprecise functions- usually for doing fun things
like illuminated signs or accent lighting.  For anything scientific
I have no input.

What are you after?

Mike H.

On 9/3/07, Gaston Gagnon <gaston.gagnonspamspam_OUTvideotron.ca> wrote:
> IIRC some time ago (years?) someone (Jinx?) was experimenting with
> shining  light in Plexiglas by attaching a led on the edge of the sheet.
> I have been looking for this thread with no avail. I would greatly
> appreciate if anyone that remember that discussion could give me a
> pointer to it.
> Gaston Gagnon
>
> -

2007\09\04@092458 by Eoin Ross

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What about wrapping the fibre and LED in foil and epoxying the outside? I'd imagine it should reduce lost light a fair bit.

>>> @spam@ajsmithKILLspamspamrivernet.com.au 03 Sep 07 18:33:16 >>>
> IIRC some time ago (years?) someone (Jinx?) was experimenting
> with shining  light in Plexiglas by attaching a led on the
> edge of the sheet.
> I have been looking for this thread with no avail. I would
> greatly appreciate if anyone that remember that discussion
> could give me a pointer to it.
> Gaston Gagnon

Agilent have a good PDF on that sort of thing, Google 'Agilent LED light
pipe' or similar.
Quite a few good tips.  Like embed the LED (drill a hole) in the plastic, or
epoxy it to reduce losses caused light bouncing off the edge of the plastic.
It also talks about drilling holes in the LED so you can put a fibre optic
cable right over the die, but that's probably a bit excessive.
Tony


2007\09\04@120730 by alan smith

picon face
Avago now has fiber LED assemblies, if that helps
 
 
 

Zik Saleeba <KILLspamzikKILLspamspamzikzak.net> wrote:
 I was trying to get as intense a point light source as possible. One
method I tried was to drill a small hole directly into the front of a
luxeon and insert an optic fiber through the hole until it was almost
touching the die. It worked ok but there was an awful lot of lost
light so I gave up on that approach.

Cheers,
Zik

On 9/4/07, Cedric Chang wrote:
{Quote hidden}

2007\09\04@162227 by Hector Martin

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I've used a similar system for lighting acrylic squares using a CCFL
tube. I painted the bottom white for light diffusion, and I painted the
sides white for reflection, except for the input side. I also added
aluminum foil behind the paint to catch any transmitted light.

Diagram:
http://marcansoft.com/uploads/images/sgdp2/arrowlightdia.png

Testing:
marcansoft.com/uploads/images/sgdp2/IMG_0901_s.jpg
http://marcansoft.com/uploads/images/sgdp2/IMG_0901_n.jpg

Finished product:
marcansoft.com/uploads/images/sgdp2/img_3130_s.jpg
http://marcansoft.com/uploads/images/sgdp2/img_3130.jpg

This was for a lighted DDR pad (with way too much creeping featuritis).
The brightness difference is exaggerated by the camera (they all seem to
do this, for some reason). It looks better in real life.

--
Hector Martin (RemoveMEhectorTakeThisOuTspammarcansoft.com)
Public Key: http://www.marcansoft.com/marcan.asc

2007\09\04@164141 by Charles Craft

picon face
Wasn't sure why you would like up a RAM module till I googled it.  %-)

-----Original Message-----
{Quote hidden}

>-

2007\09\05@104258 by Tony Smith

picon face
Couldn't hurt, but you'd still loss a bit bouncing around in the LED body,
even getting relected backwards.  The idea is to get the fibre as close to
the die as possible, a bit like the connectors do.  (Must cut one open one
day.)  I suppose you could grind the top off the LED, and epoxy the fibre to
whatever is left.  After all, (assuming a clear LED) the body just serves as
a lens, which we don't need.  That should work more-or-less as well as
drilling.

Tony


{Quote hidden}

2007\09\05@114513 by Brian Kraut

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I used to cut the tops off of LEDs for one of my products.  I would do it in
a lathe and then use 2000 grit sand paper and a polishing compound to polish
them up.  A better alternative would be one of the fiber coupling optics
that are made for the Luxeon and Cree LEDs.

I also square off and polish the ends of my plastic fibers with 400 then
1500 grit wet sand paper.  It makes a huge difference.  A real fiber optic
polishing system would also help.  So would optical gell.

Brian Kraut
Engineering Alternatives, Inc.
http://www.engalt.com

{Original Message removed}

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