The_Gnu's Lilliput projector (lot of pics) - Page 5 - diyAudio
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Old 20th August 2006, 01:37 AM   #41
CJ900RR is offline CJ900RR  Sweden
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Join Date: Jan 2006
Nice project Gnu! Like it alot.

I was just wondering from where you bought that aluminium, and how much did you pay?

I need to build a casing for my GC and want to make it in alu.

Mvh Carl-Johan...
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Old 20th August 2006, 02:36 AM   #42
The_gnu is offline The_gnu  Sweden
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Quote:
Originally posted by einthoven
The reflector is really a problem... Those glass reflectors from daylight projectors actually are too small for those big lamps we use. But DIY reflectors (aluminium, steel etc.) reflect too much InfraRed to the lcd an fresnels ... they melt.
That's really a problem that still has to be solved

My personaly idea was a transparent, temperature resistant, round glass (from the supermarket or else) to be sprayed with car aluminium spray as reflector. I wonder if it would reflect less IR. Need time to try if it works ..

Do you have the glass refl. from www.exclusiv-online.com?
Any plans to 'dremel' it for a better fit of the lamp?
yeah there is definately some improvements needed to the types of reflectors most of us use today, as there is a lot of light from the bulbs escaping out on the sides and it feels like such a waste of image brightness. Imagine if 90% of the light could be reflected on to the screen....
Do you know if a IR-filter will stop the IR's when using a diy reflector?
Yes I use the reflector from exclusiv-online.com

Quote:
Originally posted by elstcb
Woah that is truely awesome work, good luck with the rest of it, I'll be checking back on a regular basis!
Thx a lot, make shure you you do because next update will hopefully be a large one (and the last) with the finishing and result pics. I am curently painting the internals black and fabricating the top lid. Then there is only some ataching and wiering left to do.

Quote:
Originally posted by CJ900RR
Nice project Gnu! Like it alot.

I was just wondering from where you bought that aluminium, and how much did you pay?

I need to build a casing for my GC and want to make it in alu.

Mvh Carl-Johan...
Hej ... and thx

I bought the alu at my local "metalworkshop??" (plåtverkstad) for ~60$ (400sek)
The aluminium is 1,50 mm thick and 2x1 was the smallest size they could order for me. They can probably cut it for you too into exact dimentions but i didn't have the dimentions at that time so I took the whole thing with me home :P I live in a small town and it was only a small metalshop that nomaly make roofs and ventilations, so im shure you have something similar around Alingsås.
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Old 20th August 2006, 05:00 PM   #43
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Join Date: Aug 2006
hi

an IR-filter will help.
Many diy forum users build own reflectors and it works - but only if they use many fans to blow the hot air out. The projectors are loud and a lot of light comes out of the blow-holes.

Another problem is that those ir-filters stop working if the temperature gets too high. So you have to use more fans.
And condensor lenses often break with diy reflectors because they don't like it too hot.

Some people use surface mirrors to reflect the light to the LCD.
Surface mirrors only reflect 'cold' light, ir will not be reflected.
Perhaps this could help...

Seems very difficult to solve....

90% of the light ... mhm, but then another problem will appear - the black of your image becomes light grey.

And the reflector is not the only cause for the loss of light....
those lcds (hami etc) are not made to work in a projector - so they steal perhaps 30 % of the light.
The lenses are not optimal and more light gets lost.

I think it would be very expensive to optimize the DIY Pj's ... too expensive to be profitable - in view of the prices of low level projectors from BenQ etc (about 600 €)

bye
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Old 20th August 2006, 11:33 PM   #44
The_gnu is offline The_gnu  Sweden
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hi... okay thx for the useful info.
When I wrote 90% I kind of ment that it would be great to reflect almost al of the ligt onto the TFT screen. I know there is a lot of light getting lost on the way. Collecting as much of the light as possible doesent mean the black of the screen turns grey, only that we donsn't need to use as strong lamps as we do today.

take care
/gnu
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Old 17th September 2006, 11:11 PM   #45
The_gnu is offline The_gnu  Sweden
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Okay.. time for a new update. Been a while since the last one but I don't have much time to work on this project at the moment as I have moved to a new town to sudy. But on the weekends I usually take a trip home to work on it, and this is the work so far. I took some more pictures this week but I forgot the memorystick with all the pics :wallbash:. But I guess this will be enough for so long.

This is how the buttons turned out. The power button has not been mounted on the picture yet, but it is fabricated. The original "power" (1/0) symbol was to hard to do. I tried different symbols but the non of them loocked any good. So the power button will be totaly clean without any symbol. Also the "menu" symbol was changed to a ( - ) sign.
(tft power / left / right / menu)
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Blury shoot but you get a felleing of how the symbols look
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The whole projector is dissasembled because it needs to be painted black.
You might wonder why I didn't do that at the early beginning..well I started this project almost 2 years ago and didn't want to start messing with the paint until all parts were fabricated.
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the side mounted L-profiles that will help support the whole case structure
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Excuse the huge amount of masking tape...but the front is somewhere underneath. I promisse

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This is the front surface mirror. If you don't know what a front surface mirror is. Take a look at the pictures below.
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This is a normal mirror, it has the reflecting mirror surface on the backside of the glass. This creates multiple "ghost" images because the light also reflects on the surface of the glass.
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The front surface mirror have the reflecting surface on the front an therefore there is no glass infront to reflect "ghost" images. This is the same type of mirror that's used in OH-projectors. Fron surface mirrors are also very sensitive for scrathes...I tried to clean mine with one of those ultra soft cleaning towels for glasses. But even that created very small scrathes.
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Time to create some order in the Lamp ballast cabling
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The smaller white square thingy behind the mirror is the ignitor for the lamp
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TFT holder is painted black. And Fresnel lenses installed. The black thing to the left will act as an airblock to prevent the air from the fan to escape away from the TFT display.
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TFT and 80mm lamp fan added
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/GNU
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Old 18th September 2006, 12:44 AM   #46
The_gnu is offline The_gnu  Sweden
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The button electronics needed a makower to fit my design. I don't think I need to say witch one is the "new". The black little thing in the middle is the IR-sensor with holder.
Click the image to open in full size.
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my soldering pen isn't the best, but atleast it works.
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The triplet lens spacers are painted black on the inside and top to prevent light from escaping. It looks like they are made out of black plastic. If I hade painted them black on the ouside the paint would probably have pealed of when zooming because its a very tight fit against the hole in the front.
Click the image to open in full size.
(CLICK TO ZOOM)

Thats it for today. Will make a trip home this weekend to finish the projector. And will probably have some result pics and videos next week. If everything works as it is suposed to...I seriously hope I havent damaged the TFT or any other expensive stuff without knowing it.
Well will see.

/GNU
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Old 19th September 2006, 08:59 PM   #47
cookie is offline cookie  United States
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Awesome work as usual! I look forward to more pix. Have you done any testing of the lCD panel and projected image yet?
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Old 19th September 2006, 11:12 PM   #48
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good god..... It sure puts a shame to my woodworking "skills"

just wondering though, how many bits have you gone through? haha
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Old 20th September 2006, 10:32 AM   #49
The_gnu is offline The_gnu  Sweden
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Quote:
Originally posted by cookie
Awesome work as usual! I look forward to more pix. Have you done any testing of the lCD panel and projected image yet?

hi.. yeah I made some testing a while back ago to make shure it all worked well. I took a few blury shoots but nothing to fancy to show as the lenses and mirror wasn't tuned. Will wait for the resultpics until the whole procet is done. And that will be very soon.


escalade182 hehe maybe try working with alu, actualy I think its easier to get great results with alu than with wood.
how many bits have you gone through? hm... do you mean how many drillbits I have broken or how many parts I have used?.....there is alot of both actually

/GNU
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Old 21st September 2006, 12:53 AM   #50
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yeah I was talking about drill bits. I had a sheet of aluminum once apon a time but the bit went dull after 10 holes. the drill press I recently purchased makes it A LOT easier, wow. probably the best tool i have ever purchased...I should give it another go. you inspired me to want to build something... I have to finish the project I'm on though. (all oak - bar table) it's been a pain in the *** so far but mostly because I'm going for that high-end look, like your projector. if the wood splinters...I start over. its frustrating, but I love it.
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