Cheap Improved LCD Overhead Projector

Step 5 The IR+UV filter

To protect the LCD screen you'll need a IR (against heat) + UV (against fade) filter. You can buy these separately or an all in one glass. I've used the all in one. It's a small glass that needs to be placed a few centimeters above the lamp.

The easiest way to create a frame that will hold the glass above the lamp. Use iron or aluminum to make the frame. Don't use plastic or wood, because the frame gets very hot!

Open your overhead projector to look what the best way is to fit a frame above the lamp.

I've used a part from an old ATX computer power supply and made with a iron saw a hole for the filter.

Comments

[DaMachk]

Can't find any UV & IR filters... any chance you have an ebay.at store/dealer?

[mrkobayashi]

for anyone else with this question, check alibaba: http://www.alibaba.com/trade/search?SearchText=ir+uv+filter&Country=&IndexArea=product_en&fsb=y

[tten eyck]

same problem. Anyone have an answer?

[mattadamsnet]

google "hot mirror" the 0 degree one is more like the glass you see above.

There are IR, UV and IR/UV hot mirrors, a 2" square is somewhere around $40

[mattadamsnet]

Also, found this site:

http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=897

[liammk]

How many fans would i need to replicate the function of the ir/uv filter. I was thinking 3 blowing in 3 blowing out for smooth air flow.

[mattadamsnet]

I know I'm replying more than a year later, for for anyone else who stumbles upon this.... The filter is to remove the IR and UV wavelengths from the light, no amount of breeze can do this...

And the filter is to mainly protect the LCD.

[rujoesmith]

where did u find the ir+uv filter? ive looked everywhere i can think of and all i found was filters to put on the end of camera lenses. thanks :D

[dropfry]

try a hardware store.