Hi!
I finally got courage to totally open up my semidiy projector. It is a commercial Sony VPL-SC50E projector that I've hooked up to use cheap MH bulbs. Now I opened it all up to clean the optics because I knew there'd be significant amount of dust as there was a 250w halogen for a while in this projector and that burned lots of stuff to charcoal --> soot was everywhere.
So, attached here is an image of the insides of sony projectoroptics with 3 LCDs.
Here's what the numbered parts were:
1. Light evener (an array of small lenses)
2. Some kind of polariser of some sort, this used to have an metal grill on it that I've removed earlier and gained something like 20% more brightness immediatly
3. condenser lens
4. mirror
5. filtermirror, mirrors blue, lets rest (yellow) trough
6. another filter mirror, lets red trough, mirrors rest
7. condenser lens (under that cable that comes from one LCD)
8. mirror
9. condenser lens
10. some kind of filter
11. mirror (missing in this picture, it was stuck to the other half of the optics case)
12. mirror
13. beam combiner
The light source is before the 1. and the projection lens set is after the 13. There were also a polarizers combined to small condenserlenses right before every LCD.
It was actually lot easier to take apart and to put back together then I thought it would've been.
Regards
HB
I finally got courage to totally open up my semidiy projector. It is a commercial Sony VPL-SC50E projector that I've hooked up to use cheap MH bulbs. Now I opened it all up to clean the optics because I knew there'd be significant amount of dust as there was a 250w halogen for a while in this projector and that burned lots of stuff to charcoal --> soot was everywhere.
So, attached here is an image of the insides of sony projectoroptics with 3 LCDs.
Here's what the numbered parts were:
1. Light evener (an array of small lenses)
2. Some kind of polariser of some sort, this used to have an metal grill on it that I've removed earlier and gained something like 20% more brightness immediatly
3. condenser lens
4. mirror
5. filtermirror, mirrors blue, lets rest (yellow) trough
6. another filter mirror, lets red trough, mirrors rest
7. condenser lens (under that cable that comes from one LCD)
8. mirror
9. condenser lens
10. some kind of filter
11. mirror (missing in this picture, it was stuck to the other half of the optics case)
12. mirror
13. beam combiner
The light source is before the 1. and the projection lens set is after the 13. There were also a polarizers combined to small condenserlenses right before every LCD.
It was actually lot easier to take apart and to put back together then I thought it would've been.
Regards
HB
Attachments
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Very cool,
Thanks for sharing this. Im very curious about the "light evener" is this a micro-difuser or a fly-eye? The answer has a big impact on my project.
I originally thought the physics of the LC forced light between polymer chain crystals which would have a light aligning effect. Therefore I did not need to worry too much about perfect collamination. I am starting to think that making a very hard light is crucial from some of the posts ive read. If so then this is a fly-eye repeating microlens sheet. This would take light and curve it parrallel to the sheet if it is not off by a large angle (improve it 3-5 degrees).
Please let us all know!
Very cool,
Thanks for sharing this. Im very curious about the "light evener" is this a micro-difuser or a fly-eye? The answer has a big impact on my project.
I originally thought the physics of the LC forced light between polymer chain crystals which would have a light aligning effect. Therefore I did not need to worry too much about perfect collamination. I am starting to think that making a very hard light is crucial from some of the posts ive read. If so then this is a fly-eye repeating microlens sheet. This would take light and curve it parrallel to the sheet if it is not off by a large angle (improve it 3-5 degrees).
Please let us all know!
I guess it is what you call a fly-eye. It is an array shaped like its made of lenses sized about 4 x 4 mm. There were actually another one of the same kind of light evener right in front of the light source (it had also some filter layer on it) but I took it out when it broke in the heat of the 250w halogen. Didn't affect the brightness about at all, I think it was even brighter without it.
Also keep in mind that this is a structure of an projector with 0,8" LCDs... that's really small and some of the solutions that the engineers have developed for this projector might not be the best solutions for bigger LCDs, I dunno for sure of course...
Regards
HB
Also keep in mind that this is a structure of an projector with 0,8" LCDs... that's really small and some of the solutions that the engineers have developed for this projector might not be the best solutions for bigger LCDs, I dunno for sure of course...
Regards
HB
Maibe you should have a look here ? http://www.fnac.net/telecharg/dossiers_techniques_2005/videoprojecteurs_2005.pdf
I mentioned that I've removed the component 2, now I've actually removed also components 1 and 3. It still works, maybe a bit brighter but the lightsource needs now to be more precisely pointed in side the projector.
Gogou: yea, interesting looking document, altough I cant read french 🙁
HB
Gogou: yea, interesting looking document, altough I cant read french 🙁
HB
Squalish:
"Next challenge: Build a 3-LCD prism based projector"
That'd be quite interesting 🙂 Does anyone know where to get something like very small B/W 800x600-1024x768 LCDs and controllers that give output to three separated RGB channels?
Also, to gain any kind of relatively good brightness, there should be dichroidmirrors to separate the colors... not cheap stuff I guess :\
Regards
HB
"Next challenge: Build a 3-LCD prism based projector"
That'd be quite interesting 🙂 Does anyone know where to get something like very small B/W 800x600-1024x768 LCDs and controllers that give output to three separated RGB channels?
Also, to gain any kind of relatively good brightness, there should be dichroidmirrors to separate the colors... not cheap stuff I guess :\
Regards
HB
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