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Sun, Mar 21, 10 at 15:50
| I want to pick up a used Fresnel lens and I thought that all rear-projection TVs used them- but I just went and looked at a TV and it didn't appear to have one in it.
Are there certain types of rear-projection TVs that have them, and others don't? Any info would be greatly appreciated. Also, if there is somewhere else I am more likely to find out this information, please let me know- this was the only forum I know of (I'm usually in the garden section) Thank you,
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Follow-Up Postings:
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- Posted by regus_patoff (My Page) on Sun, Mar 21, 10 at 21:20
| there may be other places to buy a surplus Fresnel lens... what size were you looking for, or what are you planing on doing with it ? |
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| My goal is to get the largest one possible, out of a junk tv so I can get it free. My goal is to use it for science experiments, like maybe driving a sterling engine, melting certain metals, maybe even for some sterilization of tools. I'm wondering if maybe the one tv I looked at already had it removed, because I haven't been able to find any information about some tvs having them and others not. Thanks! |
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| All projection type TV's have them. The front screen of the TV has 2 layers. One is the lenticular and one is the fresnel lens. If the TV still has the screen, then the fresnel is still there. The fresnel screen has round grooves on the backside. It's just a large flat sheet of plastic. |
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| I suspect the TV I checked (which was already apart) must have had it removed; the only thing I found was a flat 'lens' that had square hashmarks, not the round ones I expected. Thanks for the info, I will look for another scrap to check! |
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