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'[EE] Source for cheap plastic lenses?'
2010\07\23@200834 by Michael Wirth

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One standard source for lenses for the DIYer is Edmund Scientific.
Don't know about plastic.  Most of theirs are probably glass.  (Ck.
for their pro optical catalog, as well as their hobbyist/toy website.)

HTH,

Mike

On Fri, Jul 23, 2010 at 11:42 AM, Mike Hord <spam_OUTmike.hordTakeThisOuTspamgmail.com> wrote:
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>

2010\07\23@203041 by Jim Franklin

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Have you tried any of the spectacles manufacturers or Contactlens
manufacturers, I work for an optical retailer in the UK, and I see a lot of
3" diameter uncut lenses, perhaps someone could cut you a special near you?

Also, we trash a LOT of badly cut/erroneous lenses, and I'm sure we're not
alone, so talk to the spectacle makers, they may let you grab a bag or go
dumpster shopping?

-Jim




{Original Message removed}

2010\07\23@211930 by ivp

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> Application is lensing down an IR beam to a moderately small angle.
> If I could get the diameter down to 150mm at 10m, I'd call it a win.
> I'm trying to make a laser tag game, so my receiver needs a wide
> angle of acceptance, but the beam should be small.

If price isn't a huge concern, you could try an IR laser

http://www.oatleyelectronics.com/   (Australia)

have the LM4 for $15. I've dealt with Oatley a few times and find
them good to deal with. You might find a better deal where you are

If you don't want it visible, a red laser (eg ex-pointer, very cheap)
at a low duty cycle might just be OK

Joe

*
*
**********
Quality PIC programmers
http://www.embedinc.com/products/index.ht

2010\07\23@212057 by Xiaofan Chen

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On Sat, Jul 24, 2010 at 2:42 AM, Mike Hord <.....mike.hordKILLspamspam@spam@gmail.com> wrote:
> Anybody know a good source for relatively cheap (say, <$0.50US ea)
> (in qty 100) plastic lenses?
>
> Application is lensing down an IR beam to a moderately small angle.
> If I could get the diameter down to 150mm at 10m, I'd call it a win.
> I'm trying to make a laser tag game, so my receiver needs a wide
> angle of acceptance, but the beam should be small.
>
> The smallest angle I've been able to find has been 5°, which puts the
> beam diameter at ~1.7m at 10m.
>

I do not think the cost and quantity given is possible...
Unless someone has some surplus units which fit your
needs and are willing to sell that to you.

Edmund Scientific is the typical vendor for Optics related
stuff. But I do not think you are going to get your price
at such a low quantity. The plastics are cheap, the mold
is not.



-- Xiaofan http://sourceforge.net/projects/libusb-win32/

2010\07\23@220831 by Roger Weichert

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I picked up a couple of those small slide projectors used by schools years ago and they were full of various shaped glass lenses. They vary between 25 - 50mm diameter. Dont ask me about angles though.

I still use one daily for viewing (trying to anyway !!!) component numbers that are unreadable.

Regards,   Roger



{Original Message removed}

2010\07\23@222624 by William \Chops\ Westfield

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On Jul 23, 2010, at 11:42 AM, Mike Hord wrote:

> Anybody know a good source for relatively cheap (say, <$0.50US ea)
> (in qty 100) plastic lenses?

You can look at the places that cater to the DIY-flashlight folk, eg:
http://www.dealextreme.com/products.dx/category.917~search.acrylic %20lens
There are a lot of choices in the "cheap" category; I don't think I  remember enough about optics to be able to tell whether any of them is  suited to your application, but it looks like a range worth  experimenting with (the intended app is similar to yours, I think.)

Dealextreme has a reasonable reputation; I've ordered stuff from them  and received it with no problems.  I have not used any of their  lenses, though...

BillW

2010\07\24@000839 by AK

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Hi, I have probably about 100 plastic laser lenses in a 9mmx0,5mm
threaded housing. The focal length is about 5-6mm, and emission
aperture about 4mm..  I could sell them to you for near the price
you're asking, let me know if you're interested.

On Fri, Jul 23, 2010 at 2:42 PM, Mike Hord <mike.hordspamKILLspamgmail.com> wrote:
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>

2010\07\24@041053 by Richard Prosser

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On 24 July 2010 06:42, Mike Hord <.....mike.hordKILLspamspam.....gmail.com> wrote:
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>

2010\07\24@045018 by RussellMc

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> Have you looked in a local $2 shop (or your local equiv) for cheap
> magnifying glasses?
> Also I have seen credit card sized frenel type magnifiers used as
> advertising giveaways. If you could use them & find a source they
> should be well inside your budget.

1.
          http://www.alibaba.com
           http://www.madeinchina.com
            http://www.ebay.com :-)

2. You should have little difficulty casting your own. Machining from
plastic stock a possible low volume if you have access to a tame NC
mill - more work.

Look at various LED lens shapes and compare radiation patterns. After
a while you will be able to hazard a reasonable guess as to beam width
from lens shape. Start with a tight beam one and replicate it in
general terms. Play. There are some resins available which are
intended to make optically clear plastics - used by eg hobbyists for
encasing Dandelion seed heads and the like.

I've "made" a few rough LED lenses by hacking the end off LEDs and
smoothing the remainder. Worked gratifyingly well. Avoid removing the
die while cutting :-). In one case I used a cut off LED lens &
reshaped it for another task. All quite roughly done - results tend to
be better than expected.



Russel

2010\07\24@064154 by MarcoG

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Is something as this?
Price seems ok, I don't know for focal length and diameter

http://cgi.ebay.it/5-pack-of-8-5mm-Optical-Acrylic-Lens-/160436333541?cmd=ViewItem&pt=LH_DefaultDomain_3&hash=item255ac02be5


regards,
Marco





{Original Message removed}

2010\07\24@094842 by Bob Ammerman

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>One standard source for lenses for the DIYer is Edmund Scientific.
>Don't know about plastic.  Most of theirs are probably glass.  (Ck.
>for their pro optical catalog, as well as their hobbyist/toy website.)

>HTH,

>Mike

The Pro Optical and Hobbyist/Toy halves of Edmund Scientific are two completely separate companies now with absolutely no relationship between them. In fact, the hobby side is one of my customers! They can be found at http://www.scientificsonline.com

--- Bob Ammerman

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