Full Version: Commercial Projector
I know I know this is DIY projectors. I just picked up a polaroid projector (640X480) for $15 and it works fine but no lamp I have bypassed it and have been trying bulbs like crazy. I have read thru the topic that electrodaducus (sp) has with the CREE LED but I am thinking the 35 watt HID car bulbs would be way brighter than the LED I know somebody talked about a site where all they did was put HID in commercial projectors and i have looked for all sorts of info on this kind of setup but cant find anything. Any help would be great thanks.
Another from diy audio tried LED and xenon for his IN72 and the results were that the diy replacements were no match for the oem bulb (too dim to be acceptable). Have you considered going to ywh for a replacement?
http://www.diyaudio.com/forums/showthread....threadid=124344
Here's a link from another on what is the proper glue for seating these bulbs
http://www.cotronics.com/vo/cotr/ca_fastset.htm
http://www.diyaudio.com/forums/showthread....threadid=124344
Here's a link from another on what is the proper glue for seating these bulbs
http://www.cotronics.com/vo/cotr/ca_fastset.htm
victor thank for the links this is more for fun I know it wont be as bright as the original but just as long as its viewable in total darkness I will be fine with it for 15 bucks its just something to play with .
What type of tech is inside this projector, single LCD or 3 LCD?
If it’s a single then most probably simply place the lamp where the original one was would work.
A 3 LCD is going to take a bit of fiddling. First you’ll need to find out what angle will be accepted. Use a laser, some distance away, and aim it at the extremities of the rear aperture. Once you have this data you can set about to design a light engine that mimics the angles. My guess would be it needs a beam angle close to collimated. The xenon is reasonable small to start with so you could simply fit it in the original lamp reflector from the projector. If you don’t have this reflector try getting a dead one from a repairer, it doesn’t necessarily need to be an exact match. Play around with the lamp position in the reflector until you get an acceptable beam.
DJ
A 3 LCD is going to take a bit of fiddling. First you’ll need to find out what angle will be accepted. Use a laser, some distance away, and aim it at the extremities of the rear aperture. Once you have this data you can set about to design a light engine that mimics the angles. My guess would be it needs a beam angle close to collimated. The xenon is reasonable small to start with so you could simply fit it in the original lamp reflector from the projector. If you don’t have this reflector try getting a dead one from a repairer, it doesn’t necessarily need to be an exact match. Play around with the lamp position in the reflector until you get an acceptable beam.
DJ
Well it did not have a lamp so I would have to source that elsewhere, and it is a PolySilicon TFT Active Matrix x 3 the model is Polaroid lcd projector 211.
Well I have learned a lot about DIY projectors but commercial ones are a different beast. I know I need a light source and all that but is the concept still the same?? Small point light source???
Well I have learned a lot about DIY projectors but commercial ones are a different beast. I know I need a light source and all that but is the concept still the same?? Small point light source???
QUOTE (sdubb @ Jul 26 2008, 05:58 PM) 
Well it did not have a lamp so I would have to source that elsewhere, and it is a PolySilicon TFT Active Matrix x 3 the model is Polaroid lcd projector 211.
Well I have learned a lot about DIY projectors but commercial ones are a different beast. I know I need a light source and all that but is the concept still the same?? Small point light source???
Well I have learned a lot about DIY projectors but commercial ones are a different beast. I know I need a light source and all that but is the concept still the same?? Small point light source???
Sort of
They both use optics to shape and steer the light.Do you have a pic of its gizzards?
The biggest difference is that a DIY first diverges the light to cover the LCD. Then converges to fit through the triplet.
A 3 LCD splits the light into r, g and b but each optic path is similar. Considering just one path, the light from the lamp is collected by the reflector to produce a collimated beam. It’s then passed through various optic elements that shape the beam to be more square, even, polarise correct. There can also be more optic element in there that can slightly modify the beam angles to diverge enough to pass through the LCD and on to the objective lens.
DJ
A 3 LCD splits the light into r, g and b but each optic path is similar. Considering just one path, the light from the lamp is collected by the reflector to produce a collimated beam. It’s then passed through various optic elements that shape the beam to be more square, even, polarise correct. There can also be more optic element in there that can slightly modify the beam angles to diverge enough to pass through the LCD and on to the objective lens.
DJ
Here you go dazzzla pics why is is that we put our bulbs with the arc facing the lcd but when commercial projectors do it the bulb is down in the reflector 2 totally opposite ways is one more effecient one way than another??
more pics
more pics
why is is that we put our bulbs with the arc facing the lcd but when commercial projectors do it the bulb is down in the reflector 2 totally opposite ways is one more effecient one way than another??more pics
more pics
more pics
where oh where did dazzzla go oh where oh where can he be................
anyway I tried a 35 watt HID off road light and the results were promising considering the off road light with all its casing was shoved up to the ligh box section and then a small mirror was was placed at a 45 degree I was able to see some decent images in total darkness so looks like I will be headed in this direction. The offroad HID will be returned and I will souce e-bay for a set that has just the ballast and bulb. To bad this dont come in 120V, this is where my old computer PS come into play.
anyway I tried a 35 watt HID off road light and the results were promising considering the off road light with all its casing was shoved up to the ligh box section and then a small mirror was was placed at a 45 degree I was able to see some decent images in total darkness so looks like I will be headed in this direction. The offroad HID will be returned and I will souce e-bay for a set that has just the ballast and bulb. To bad this dont come in 120V, this is where my old computer PS come into play.
Commercial projectors can get away with a lot in the way of the light engine.
1. They get to make their own reflectors, so they can spec them however they want in order to get the desired case size.
2. They're dealing with a much smaller LCD, which makes the objective lens much larger by comparison. This negates the need for as precise control of that light. This also, by the way, allows them the ability to use a parabolic reflector arrangement, something that simply isn't practical for a panel over 7" diagonal, since the required parabola size is signifigantly less efficient. This changes a lot of factors.
3. They're dealing with a much smaller lamp arc. See above.
4. They can literally have custom collimator/condenser lenses. This allows them much more freedom in the placement of the light source.
1. They get to make their own reflectors, so they can spec them however they want in order to get the desired case size.
2. They're dealing with a much smaller LCD, which makes the objective lens much larger by comparison. This negates the need for as precise control of that light. This also, by the way, allows them the ability to use a parabolic reflector arrangement, something that simply isn't practical for a panel over 7" diagonal, since the required parabola size is signifigantly less efficient. This changes a lot of factors.
3. They're dealing with a much smaller lamp arc. See above.
4. They can literally have custom collimator/condenser lenses. This allows them much more freedom in the placement of the light source.
This is a "lo-fi" version of our main content. To view the full version with more information, formatting and images, please click here.